CN104914358B - Shelf depreciation monitoring arrangement and shelf depreciation monitoring system - Google Patents
Shelf depreciation monitoring arrangement and shelf depreciation monitoring system Download PDFInfo
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- CN104914358B CN104914358B CN201510111603.3A CN201510111603A CN104914358B CN 104914358 B CN104914358 B CN 104914358B CN 201510111603 A CN201510111603 A CN 201510111603A CN 104914358 B CN104914358 B CN 104914358B
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Abstract
The present invention provides a kind of shelf depreciation monitoring arrangement and system, it can obtain monitoring precision that is higher and improving shelf depreciation for the frequency for being supplied to the charging current of electric machine for generating shelf depreciation from capacitor is selected, and be applicable to existing by electric controller switching equipment and production is also high.In the shelf depreciation monitoring arrangement (20), the insulator (22) of built-in capacitor (24) is contained in accommodate the electric machine for be used as supervision object (10) metal container (6) it is interior, capacitor is connected to voltage bus (12) and earth bus (14), the capacitor supplies the charging current (i with the shelf depreciation to the electric machine for producing shelf depreciation0).The current detector (28) detected to the charging current for flowing through the ground line is set on the ground line (26) of capacitor.It further include the signal processing apparatus (30) detected to the value of the charging current detected by current detector.
Description
Technical field
The present invention relates to a kind of apparatus and systems for monitoring shelf depreciation, and the shelf depreciation is received in metal container
It is generated made of the electric machine of Rong Yitai or more by the electric machine of electric controller switching equipment, the electric machine is, for example, to become
Depressor, reactor (reactor), power factor (power factor) improve electricity container, rectifier, breaker, switch
(switch) etc..
Background technique
The major part of shelf depreciation monitoring (detection) device proposed in the past is in the following way: when being contained in metal
When generating shelf depreciation in the electric machine in container, to the discharge current (electric current for the ground line for flowing through the electric machine
The for example, high-frequency current of megahertz (MHz) grade) it is measured.
For example, describing a kind of local discharge detection device in patent document 1, the local discharge detection device is in made of metal
In container, detected to the discharge current that respectively connected the earth bus of more electric machines via ground line is flowed through
(more specifically carrying out differential detection), thus detects the shelf depreciation in the electric machine.
However, the discharge current of the grounded line of convection current including the mode recorded in comprising patent document 1 is detected
Mode in, there is the project for being difficult to correctly detect shelf depreciation.This is because if in detail from the point of view of, each electric machine
Earthed circuit removes connect in most cases not simply by 1 piece-root grafting ground wire and with 1 point of ground connection (or being connected to earth bus)
Other than ground wire, the outer wall etc. of each electric machine is generally also connected to earthed circuit, the road that the discharge current of shelf depreciation is flowed through
Diameter is complicated, and the discharge current is in earthed circuit internal circulation flow, thus is difficult to carry out the correct detection of the discharge current.Especially
The discharge current of shelf depreciation is high-frequency current, so that there are the following problems: the path that high-frequency current is flowed through usually may not be such as
Design like that, but is intricately difficult to grasp, and also different for the construction of each equipment.
On the other hand, following technology is described in patent document 2: as the factory test equipment of measurement shelf depreciation, and
The AC power source and coupling capacitor of test are prepared, the AC power source that the test is used is to the electricity as subjects
Mechanism of qi device (power equipment) applies the alternating voltage of test, and the coupling capacitor is connected in parallel with the AC power source, when
When generating shelf depreciation in electric machine, it will be supplied to electrically with the comparable charging current of disappearance charge institute of the shelf depreciation
Machine, and on the external electric machine as subjects of AC power source and coupling capacitor that the test is used, and
The charging current for being supplied to electric machine from coupling capacitor is detected when generating shelf depreciation.
The technology is because detecting the charging current supplied from the coupling capacitor, so the electric current of detection is clear,
The project being thus able to solve in the presence of the mode detected to the discharge current for flowing through the ground line.
[existing technical literature]
[patent document]
[patent document 1] Japanese Patent Laid-Open 9-5386 bulletin (Fig. 1, paragraph 0012-0017)
[patent document 2] Japanese Patent Laid-Open 2011-149896 bulletin (Fig. 4, paragraph 0011-0016)
Summary of the invention
[problem to be solved by the invention]
What although discharge current that the technology recorded in patent document 2 is able to solve the grounded line of convection current was detected
The project present in mode, but as recorded in Patent Document 2 like that (referring to paragraph 0018-0020), can also exist such as
Lower project: the frequency low (such as tens of thousand for the charging current of electric machine for generating shelf depreciation is supplied to from coupling capacitor
Conspicuous (kHz)~hundreds of kilohertzs (kHz)), thus the duration of electric current can be equally long, and supply identical charge (=electricity
The time integral of stream) in the case where, the value of charging current reduces, and thus signal-to-noise ratio (signal/noise, SN) ratio is deteriorated, thus
It is difficult to carry out the correct detection of shelf depreciation.
Moreover, there is also following projects for the technology recorded in patent document 2: because being factory test equipment,
It is difficult to apply to existing by electric controller switching equipment, and is unfavorable for production.
In addition, being described in patent document 2 such as under type: the value as the solution charging current is small and SN is than poor class
One method of topic, detects the made of metal wall of a container face current potential of electric machine.However, which utilize be from from
So it is present in the floating electrostatic capacitance in the metal container of electric machine to shelf depreciation position supplying charging current, even if should
The frequency dependant of charging current also can not artificially select the floating electrostatic capacitance in the floating electrostatic capacitance, thus with regard to nothing
For method artificially selectes frequency this aspect of charging current, still there is further room for improvement.
Therefore, it is an object of the present invention to further improving the technology recorded in patent document 2, and provides as follows
Shelf depreciation monitoring arrangement: the frequency that the charging current of electric machine for generating shelf depreciation is supplied to from capacitor is selected
Monitoring precision higher and that shelf depreciation can be improved, further, it is possible to be applied to existing by electric controller switching equipment, and production
It is high.
Moreover, another object of the present invention is to provide a kind of parts including multiple shelf depreciation monitoring arrangements to put
Electric monitoring system.
[technical means to solve problem]
Shelf depreciation monitoring arrangement of the invention monitors that the shelf depreciation is in metal container to shelf depreciation
It is generated made of the electric machine of interior receiving 1 or more by the electric machine of electric controller switching equipment, the shelf depreciation prison
In view apparatus: the insulator of built-in capacitor (a) is contained in the gold for accommodating the electric machine for being used as supervision object
Belong in container, one end of the capacitor is electrically connected at the voltage bus in the metal container, and by the other end
Electrical ground, the capacitor supply the charging electricity with the shelf depreciation to the electric machine for producing the shelf depreciation
Stream, (b) setting detects the charging current for flowing through the earthed circuit on the earthed circuit of the capacitor
Current detector (c) further includes the signal detected to the value of the charging current detected by the current detector
Processing unit.
As the factory test equipment recorded in the patent document 2, conduct is placed outside using by coupling capacitor
In the technology of the electric machine of subjects, coupling capacitor and necessarily increase as the inductance between the electric machine of subjects
Greatly, it is believed that this is the principal element that the frequency of charging current when generating shelf depreciation reduces.
In contrast, shelf depreciation monitoring arrangement of the invention because by built in supply shelf depreciation generate when charging electricity
The insulator of the capacitor of stream is contained in metal container identical with the electric machine person that is used as supervision object is accommodated,
Thus it can reduce the capacitor and as the inductance between the electric machine of supervision object.Therefore, can make from the capacitor
The frequency for being supplied to the charging current of electric machine for producing shelf depreciation becomes relatively high.Also, it can freely select
The electrostatic capacitance of the capacitor, it is thus possible to relatively free to select the frequency of the charging current.As a result, being put to part
In the case where electric position supply identical charges, external compared with what is recorded in patent document 2 the technology of coupling capacitor, charging electricity
The value (amplitude) of stream increases, thus SN is better than change, and the monitoring precision of shelf depreciation can be improved.
Also, the electrical of supervision object is used as because the insulator for being configured to by built in the capacitor is contained in accommodate
In the metal container of machine, so can constitute around capacitor with simplifying, be easily applied to it is existing by electric controller switching equipment, and
And amount generation is also high.
The insulator of built-in the capacitor can also be as being supporting insulator, and the supporting insulator is in the metal
The voltage bus is supported from ground potential portion in container.
The current detector can also make the Rogowski Coil of the ground line of the capacitor grounding for encirclement
(Rogowski coil)。
The signal processing apparatus may also comprise bandpass filter (band pass filter, BPF), the bandpass filtering
Device is connected to the current detector, in the frequency band for making the resonant frequency of the electric circuit flowed through comprising the charging current
Pass through to signal-selectivity.
Shelf depreciation monitoring system of the invention includes: (a) communication line, transmits signal；(b) multiple shelf depreciation monitoring
Device is the shelf depreciation monitoring arrangement according to any one of technical solution 6,7 or 8, the signal processing device therein
Setting has via the communication line telecommunication circuit of receiving and transmitting signal；(c) data collection process device, including via described logical
Believe the telecommunication circuit and data collection module of route and receiving and transmitting signal, the data collection module is at intervals of set time via institute
State communication line and the instruction for sending determination data be provided each shelf depreciation monitoring arrangement, and collect at this moment and save by
The determination data that each shelf depreciation monitoring arrangement is saved.
[The effect of invention]
It is invented according to documented by technical solution 1, the capacitor of charging current when built-in supply shelf depreciation is generated
The insulator of device is contained in metal container identical with the electric machine person that is used as supervision object is accommodated, thus can subtract
Small capacitor and as the inductance between the electric machine of supervision object.Therefore, can make from the capacitor to producing office
The frequency of the charging current of the electric machine supply of portion's electric discharge becomes relatively high.Also, it can freely select the capacitor
Electrostatic capacitance, thus can relatively free to select the frequency of the charging current.As a result, supplying phase to local discharge part position
In the case where same charge, compared with the technology for the external coupling capacitor recorded in patent document 2, the value (amplitude) of charging current
Increase, thus SN is better than change, and the monitoring precision of shelf depreciation can be improved.
Also, it is configured to for the insulator of built-in the capacitor being contained in and accommodates the electrical machine for being used as supervision object
In the metal container of device, thus can constitute with simplifying around capacitor, be easily applied to it is existing by electric controller switching equipment, and
And amount generation is also high.
Even if moreover, by built in electric controller switching equipment more electric machines, no matter generated in which electric machine
Shelf depreciation can supply the charging current with shelf depreciation to the electric machine from the capacitor, and detectable
The charging current, thus can simultaneously monitor by the shelf depreciation in more electric machines in electric controller switching equipment.
It is invented according to documented by technical solution 2, further realizes following effect.That is, exhausted because of built-in capacitor
The supporting insulator that edge doubles as voltage bus, so can be by the insulator of built-in the capacitor and existing by electric distribution
The supporting insulator both deposited in equipment is replaced.It is therefore not necessary to which the exhausted of built-in capacitor can be arranged in extra space
Edge, thus can be more easily applied to existing by electric controller switching equipment.
It is invented according to documented by technical solution 3, further realizes following effect.That is, current detector is to surround electricity
The Rogowski Coil of the ground line of container, the ground line are directly becoming the primary circuit (primary of Rogowski Coil
Circuit), even if thus setting current detector, be also able to detect shelf depreciation generate when charging current without will increase
The capacitor and as the inductance between the electric machine of supervision object.Therefore, the frequency that the charging current will not be reduced, by
The value of this charging current increases and SN is than becoming good, thus the monitoring precision of shelf depreciation can be improved.
Also, because Rogowski Coil is the derivative-type current detector for exporting the differential signal of detected signal, institute
Excellent with the detection of the tiny signal under high-frequency range, charging current when shelf depreciation generates also is the one of such tiny signal
Kind, it is thus possible to the charging current is more precisely detected, to can further improve the monitoring precision of shelf depreciation.
It is invented according to documented by technical solution 4, further realizes following effect.That is, signal processing apparatus has band
Bandpass filter, the resonant frequency for the electric circuit which flow through charging current when generating comprising shelf depreciation
Frequency band in signal-selectivity pass through, thus the detection accuracy of the charging current can be improved, to can further improve office
The monitoring precision of portion's electric discharge.
It is invented according to documented by technical solution 5, further realizes following effect.That is, include partial pressure electricity container and
DC power supply circuit can supply power supply to signal processing apparatus from the partial pressure electricity container and DC power supply circuit, because without
It needs to supply power supply externally to shelf depreciation monitoring arrangement.Therefore, the setting of shelf depreciation monitoring arrangement becomes easy.
It is invented according to documented by technical solution 6, further realizes following effect.That is, signal processing apparatus includes such as
Lower unit: the unit, which makes and saves, makes the phase of commercial frequency voltage component and the charging current to detect when the phase
Value establish the resulting determination data of association each other, thus in addition to monitoring shelf depreciation generates, also can determine the 3 of electric machine
Which in phase mutually generates shelf depreciation.
It is invented according to documented by technical solution 7, further realizes following effect.That is, obtaining following discovery: putting part
It is high that electrical phenomena concentrates a possibility that generation in the specific phase interval of commercial frequency voltage, thus according to each phase interval
Divide determination data so that determine in 3 phases which mutually generate shelf depreciation and become easier to.
It is invented according to documented by technical solution 8, further realizes following effect.That is, obtaining following discovery: putting part
Electrical phenomena is once generation, then high a possibility that generation substantially within each period of commercial frequency voltage, thus about
The value of the charging current of each phase interval, the average value during the multiple weeks for taking commercial frequency voltage, even if thus because of noise etc.
Influence and there are the values of accidental and abnormal charging current, its influence can also be reduced, thus the reliable of determination data can be improved
Property, to can further improve the monitoring precision of shelf depreciation.
It is invented according to documented by technical solution 9, including communication line, multiple shelf depreciation monitoring arrangements and data are received
Collect processing unit, the determination data of multiple shelf depreciation monitoring arrangements can be collected simultaneously at a distance, thus can be same at a distance
When monitor the shelf depreciation that is respectively set in multiple electric machines by electric controller switching equipment of the shelf depreciation monitoring arrangement.
It is invented according to documented by technical solution 10, further realizes following effect.That is, obtaining following discovery: in day
Gas is rain or snow or humidity high period, and there are electric discharge phenomena in the atmosphere generated other than shelf depreciation in electric machine etc.
Possibility, therefore by the way that the determination data in the period forecloses, and the reliable of determination data can be further increased
Property, to can further improve the monitoring precision of shelf depreciation.
It is invented according to documented by technical solution 11, further realizes following effect.That is, obtaining following discovery: electrical
Shelf depreciation in machine be when generating hastily generate, and if generating its long lasting for a possibility that it is high, it is adjoint
This, the value of discharge current contained in trend data also rapidly increases, and the state of the increase is for a long time.Therefore, determine
Whether the value of charging current contained in trend data is interior during the prescribed period to increase regulation amplitude or more, and determines the shape of the increase
Whether state continue for specified time limit, thus can exclude the influence of electric discharge phenomena other than shelf depreciation etc. and correctly determine part
Electric discharge generates.
Detailed description of the invention
Fig. 1 is the skeleton diagram for indicating to be arranged an example by electric controller switching equipment of shelf depreciation monitoring arrangement of the invention.
Fig. 2 is another figure for indicating shelf depreciation monitoring arrangement.
Fig. 3 is another block diagram for indicating signal processing apparatus.
Fig. 4 is the figure to illustrate the phase of commercial frequency voltage and the relationship of partial discharge phenomenon.
Fig. 5 is the figure to the relationship of the phase and partial discharge phenomenon that illustrate the commercial frequency voltage of 3 phases.
Fig. 6 is the skeleton diagram for indicating an example of shelf depreciation monitoring system of the invention.
Fig. 7 is the figure of the outline example of the time passage for the value for indicating charging current contained in trend data.
[explanation of symbol]
2: source power supply
4: by electric controller switching equipment
6: metal container
8: dividing wall
10,10a: electric machine
12: voltage bus
14: earth bus
16: charge disappearance source
20: shelf depreciation monitoring arrangement
22: insulator
24: capacitor
26: ground line
28: current detector
30: signal processing apparatus
32: partial pressure electricity container
34: continuous-current plant
36: amplifier
38: bandpass filter
40: processing circuit
42: peak detector
44:A/D converter
46: data processing equipment
48: low-pass filter (extraction unit)
50: zero-crossing detector
52: counter
54: clock signal generator
56: telecommunication circuit
58: antenna
60: communication line
62: data collection process device
64: telecommunication circuit
66: transacter
68: decision maker
70: weather information supplier
i0: charging current
Q: charge
RS: reset signal
S1: the phase interval near the centre between 0 degree~90 degree until 90 degree
S2: from the phase interval near the centre of 180 degree~270 degree until 270 degree
S3: it clips 90 degree and is the phase interval before and after it
S4: it clips 270 degree and is the phase interval before and after it
S5: from the phase interval near 0 degree~90 degree of centre until neighbouring after 90 degree
S6: from the phase interval near the centre of 180 degree~270 degree until neighbouring after 270 degree
SA、SB: it is equivalent to phase interval S5, phase interval S6Phase interval
SC: phase interval
φ: phase
Specific embodiment
(1) shelf depreciation monitoring arrangement
An example by electric controller switching equipment that shelf depreciation monitoring arrangement of the invention is set is indicated in Fig. 1.
It should be to accommodate more electric machines 10 in metal container 6 to form by electric controller switching equipment 4 in the example.Each
Between electric machine 10, dividing wall 8 can also be set such as the example.Moreover, metal container 6 can also be by more metal casees
Body links.This constitutes the concept for being also contained in metal container 6 in this application.It is contained in the electrical of metal container 6
Machine 10 can also be 1.
Each electric machine 10 is, for example, transformer, reactor, power-factor improvement electricity container, rectifier, breaker, opens
Close etc., but it is not limited to particular one.
Each electric machine 10 is connected to the voltage bus 12 being arranged in metal container 6 and earth bus 14.Ground connection is female
Line 14 and 6 electrical ground of metal container.From source power supply 2 to supplier's electricity consumption between voltage bus 12 and earth bus 14
Power.Voltage bus 12 is, for example, the high voltage bus of 6.6kV etc. or the low-voltage bus bar of 440V etc., with transformer as electrical
It can also be the both sides of the low-voltage bus bar of the high voltage bus and primary side of the primary side in the case where machine 10.
Shelf depreciation monitoring arrangement 20 is set by electric controller switching equipment 4 at this, the shelf depreciation monitoring arrangement 20 is to interior
The shelf depreciation generated in each electric machine 10 being placed in one is monitored.
In addition, source power supply 2, each electric machine 10, voltage bus 12 etc. are usually 3 phases.Shelf depreciation monitoring arrangement 20
It may be disposed at each phase in 3 phases, even if but be only arranged at 1 phase, the shelf depreciation of other phases can also be monitored.It later will be right
The situation is described in more detail.Fig. 1 etc. indicates the example in the case where shelf depreciation monitoring arrangement 20 is arranged in 1 phase.
When producing shelf depreciation in electric machine 10 (such as electric machine 10a), such as in the patent document 2
Documented by generation mechanism as shelf depreciation like that, which is a kind of charge disappearance source 16, it is believed that should
Shelf depreciation position generates in electric machine 10.Moreover, the amount about the charge q to disappear in the charge disappearance source 16, be from
External charging and fill up.
The shelf depreciation monitoring arrangement 20 has built-in the insulator 22 of capacitor 24, and the capacitor 24 is to as described
The electric machine 10 (such as 10a) for producing shelf depreciation supplies the charging current i of the adjoint shelf depreciation0(charging current i0
For the electric current for being equivalent to the disappearance charge q).It accommodates that is, the insulator 22 of built-in capacitor 24 is contained in as prison
In metal container 6 depending on the electric machine 10 of object, one end of the capacitor 24 is electrically connected at voltage bus 12, it will be another
One end electrical ground.In the example, earth bus 14 is connected to via ground line 26 and is grounded.
Insulator 22 is, for example, porcelain insulator, resin insulator etc., and shape, material etc. are not limited to particular one.
Charging current i0In general for by charging current i0It is the inductance L of the electric circuit (closed circuit) flowed through, quiet
The decaying vibrational waveform of capacitor C and resistance R defined.That is, charging current i0For exchange (more specifically high frequency), side
It is inverted to according to the time.
Shelf depreciation monitoring arrangement 20 further include: current detector 28 is set to the earthed circuit of capacitor 24 and convection current
Through charging current i herein0It is detected；And signal processing apparatus 30, the charging to being detected by the current detector 28
Electric current i0Value (amplitude) detected.
Current detector 28 is, for example, Rogowski Coil, but can also be other persons.Moreover, current detector 28 is as being somebody's turn to do
It is also built-in in insulator 22 as example.It will be described in later about Rogowski Coil.
Signal processing apparatus 30 can also be contained in metal container 6 such as the example, may also be disposed on metal container 6
Outside.For example, being mountable to the outer surface of metal container 6.The more specific example of the signal processing apparatus 30 will be in laggard
Row narration.
Charging current i when the shelf depreciation monitoring arrangement 20 generates built-in supply shelf depreciation0Capacitor 24
Insulator 22, be contained in metal container 6 identical with the electric machine that is used as supervision object is accommodated, thus can
Reduce the capacitor 24 and as the inductance between the electric machine 10 of supervision object.Therefore, can make to supply from the capacitor 24
It is given to and produces the charging current i of the electric machine 10 of shelf depreciation0Frequency become relatively high.Also, because can be freely
The electrostatic capacitance of the capacitor 24 is selected, so the charging current i can be selected relatively free to0Frequency.As a result, right
Shelf depreciation position supplies identical charges (in the case where the disappearance charge q), compared with the external coupling recorded in patent document 2
The technology of capacitor, charging current i0Value (amplitude) increase.This is because if charging current i0Frequency it is high, then it continues
Time t can shorten, and will also realize that according to the following formula, if duration t is short, in the case where supplying identical disappearance charge q,
Charging current i0Value will increase.As a result, SN is better than change, so that the monitoring precision of shelf depreciation can be improved.
[numerical expression 1]
Q=∫ i0(t)dt
For example, if imagining following closed circuit: by charging current i0The inductance L of the closed circuit flowed through is set as
In the case where 5 μ of μ H~20 H, the electrostatic capacitance of capacitor 24 is chosen to be 1000pF, and the electrostatic capacitance is put with part is produced
The electric machine 10 of electricity over the ground between the synthesis electrostatic capacitance of electrostatic capacitance be 50pF~1000pF, then charging current i0Frequency
RateFor 1MHz~10MHz.In the case where this technology than the external coupling capacitor recorded in patent document 2
Big 2 digits of frequency (tens of kHz~hundreds of kHz) or so.
Also, shelf depreciation monitoring arrangement 20 is constructed as follows: the insulator 22 of built-in capacitor 24 is contained in
Hold and be used as in the metal container 6 of the electric machine 10 of supervision object, thus can constitute with simplifying around capacitor, easily
Be applied to it is existing by electric controller switching equipment, and measure generate it is also high.
Moreover, as the example of Fig. 1, even if by built in electric controller switching equipment 4 more electric machines 10, no matter at which
Shelf depreciation is generated in the electric machine 10, the electric machine 10 can be supplied from capacitor 24 and be filled with shelf depreciation
Electric current i0, and can detect charging current i0, thus can simultaneously monitor by more electric machines 10 in electric controller switching equipment 4
In shelf depreciation.Fig. 1 is the example in the case where producing shelf depreciation in electric machine 10a, but can also similarly be monitored
By the shelf depreciation of other electric machines 10 in electric controller switching equipment 4.
In addition, even if one in electric machine 10 is transformer (such as step-down transformer), and its primary side and time
Grade side separate voltage bus 12, the electrostatic capacitance between grade of primary of transformer generally also can very greatly (such as hundreds of pF with
On), thus it is believed that the charging current i of MHz grades of the frequency band0Close to the shape for the voltage bus for being equivalently connected to both sides
State, therefore usually can be monitored from the shelf depreciation monitoring arrangement 20 for the voltage bus 12 for being connected to side and be connected to the other side
The shelf depreciation of the electric machine 10 of voltage bus 12.
The insulator 22 of built-in the capacitor 24 can also support electricity from ground potential portion as in metal container 6
Press the supporting insulator of bus 12.Then, the insulator 22 of built-in the capacitor 24 can be with existing by electric controller switching equipment
The supporting insulator both deposited be replaced.Therefore, there is no need to extra space can be arranged built-in the insulation of capacitor 24
Son 22, thus can more easily be applied to shelf depreciation monitoring arrangement 20 existing by electric controller switching equipment 4.If such as the example
Such current detector 28 is also built in insulator 22, then shelf depreciation monitoring arrangement 20 is applied to existing by electric controller switching equipment
It will be become easier in 4.
It can also be to surround the ground line that be grounded capacitor 24 the example as shown in Fig. 1 etc. of current detector 28
26 Rogowski Coil.Rogowski Coil significantly simplifies in Fig. 1 etc. and illustrates, but as is known, be
Annulus made of surrounding's coiled electrical conductor of the core (or hollow) of ring bodies, to caused by the electric current by the inside of the coil
Flux change detected, thus can detect and measure the electric current.
If current detector 28 is set as the Rogowski Coil, ground line 26 is directly becoming Luo Kefusi
The primary circuit of lubber ring, even if thus setting current detector 28, be also able to detect shelf depreciation generate when charging current
i0Without will increase capacitor 24 and as the inductance between the electric machine 10 of supervision object.Therefore, the charging will not be reduced
Electric current i0Frequency, thus charging current i0Value increase and SN is better than change, thus the monitoring precision of shelf depreciation can be improved.
Also, Rogowski Coil is the derivative-type current detector for exporting the differential signal of detected signal, thus
The detection of tiny signal under high-frequency range is excellent, charging current i when shelf depreciation generates0It also is the one of such tiny signal
Kind, it is thus possible to more precisely detect charging current i0, to can further improve the monitoring precision of shelf depreciation.
The more specific example of Fig. 2 expression signal processing apparatus 30.The signal processing apparatus 30 includes: amplifier 36, will
Carry out charging current i described in self-test0The signal of current detector 28 amplified；Bandpass filter 38 makes from amplifier
Pass through to 36 signal-selectivity；And processing circuit 40, the signal from bandpass filter 38 is handled and detects and fills
Electric current i0Value.Bandpass filter 38 makes comprising the charging current i0Resonant frequency (resonance of the electric circuit flowed through
Frequency is for instance in the range of 1MHz~10MHz as described) frequency band in signal-selectivity pass through.
A possibility that in the presence of externally to by various interference signals are transmitted in electric controller switching equipment 4.As follows may for example, existing
Property: from 2 side of source power supply or the load side of its opposite side, frequency is low caused by transmitting because of electric discharge phenomena, surge (surge) etc.
The interference signal of (such as hundreds of kHz are below).If it is considered that being connected to the length of the power cable by electric controller switching equipment 4, then
Radio-frequency component is big a possibility that its transmission midway is substantially decayed.Moreover, there is also following possibilities: transmitting such as radio wave or
With high frequency (such as more than 10MHz degree) interference signal as the electric wave of big electric discharge machining in gas.Moreover, there are interference letters
A possibility that number being contained in from the signal of current detector 28.
Therefore it as the example, if the bandpass filter 38 is arranged, can prevent from current detector 28
The interference signal contained in signal, thus processing circuit 40 can be improved to the charging current i0Detection accuracy, thus
It can further improve the monitoring precision of shelf depreciation.
Example as shown in Figure 2 is such, can also be in insulator 22 and the ground side of the capacitor 24 is arranged in series point
Electricity container 32 is pressed, and continuous-current plant 34 is further set, the continuous-current plant 34 is by 32 institute of partial pressure electricity container
The alternating voltage for the commercial frequency shared is converted to the DC voltage of required voltage and exports, and is configured to fill the DC power supply
Set 34 output as signal processing apparatus 30 power supply and supply.Continuous-current plant 34 is, for example, switching power unit,
It can be device in addition to this.
If constituted as described, do not need to supply power supply (control use to shelf depreciation monitoring arrangement 20 from outside
Power supply), thus the setting of shelf depreciation monitoring arrangement 20 becomes easy.Moreover, shelf depreciation monitoring arrangement 20 be applied to it is existing
By will become simple in electric controller switching equipment 4.
Another example of signal processing apparatus 30 is shown in Fig. 3.Illustrate in amplifier 36 and bandpass filter 38 and Fig. 2
Person is identical, thus omits repeated explanation herein.
More specific example of the signal processing apparatus 30 as the processing circuit 40, comprising: peak detector 42, it is right
The charging current i detected by current detector 280Peak value carry out detect and kept to from data processing equipment 46 mentioning
Until reset signal RS；A/D (analog-to-digital analog-to-digital) converter 44 carries out A/D to the peak value and turns
It changes；And data processing equipment 46 (data processing unit), it makes and the quotient provided by the peak value and from counter 52 is provided
It is established with the phase of voltage to frequency ingredient and is associated with resulting determination data.The charging current i detected by current detector 280's
Frequency is high as described, thus charging current i is detected using peak detector 420Peak value and kept, thus may be used
The burden of signal processing after mitigation.The more specific example of the function of the data processing equipment 46 will be chatted in later
It states.Data processing equipment 46 is for example constituted using microprocessor and memory.
In the signal detected by current detector 28 except comprising with the charging current i0Except comparable signal, certainly
It also include commercial frequency voltage component.As shown in Figure 1, applying from source power supply 2 between voltage bus 12 and earth bus 14
Commercial frequency voltage, thus be grounded in 26 and also flow commercial frequency electric current.The commercial frequency electric current is because passing through capacitor 24
And flow, so becoming the electric current from 90 degree of voltage-phase advance.
The phase information of the commercial frequency voltage component is utilized in the signal processing apparatus 30 of this well, by setting
It is placed in the shelf depreciation monitoring arrangement 20 of 1 phase, can not only monitor the shelf depreciation of other phases, may further determine that in electric machine 10
Which in 3 phases mutually generates shelf depreciation.
I.e., it is believed that constitute by electric controller switching equipment 4 voltage bus 12 and electric machine 10 it is each it is alternate it is usual utilize phase
Biggish electrostatic capacitance is coupled.Therefore, even if shelf depreciation monitoring arrangement 20 is arranged in 1 phase, and in other phase generations office
Portion's electric discharge, although value is of different sizes, also for the charging current i0Flowing using current detector 28 to be detected
Charging current i0, thus can monitor the shelf depreciation of other phases.
In addition to this, in order to the determining phase for generating shelf depreciation, signal processing apparatus 30 further include: low-pass filter
(low pass filter, LPF) 48 (extraction unit), is extracted out commercial from the signal detected by the current detector 28
(the commercial frequency voltage component is the phase of shelf depreciation monitoring arrangement 20 is arranged, i.e. aftermentioned representative to voltage to frequency ingredient
The commercial frequency voltage component of phase)；Zero-crossing detector 50, to the commercial frequency voltage component extracted out by low-pass filter 48
Zero cross point is detected；Clock signal generator 54 generates clock signal；And counter 52, for commercial frequency voltage
The phase every 1 weeks of ingredient counts the clock signal, determines the phase of commercial frequency voltage component and will indicate to be somebody's turn to do
The information (specifically count value) of phase is supplied to the data processing equipment 46.The zero-crossing detector 50 counts
Device 52 and clock signal generator 54 constitute phase decision unit.
Data processing equipment 46 makes and saves determination data, and the determination data is by the commercial frequency voltage component
Phase and the charging current i that detects when being the phase0Value (in the example be peak value) establish association gained each other.Pass through
Such determination data is made and saved, in addition to monitoring shelf depreciation generates, may further determine which in 3 phases of electric machine 10
Mutually generate shelf depreciation.The situation is illustrated below.
(A) there are small hole (gap shape defects) in the dielectric substance of electric machine 10, and generate part here and put
In the case where electricity, part is generated in the voltage regime that the commercial frequency voltage for being applied to the hole is more than the discharge voltage of hole and is put
Electricity, thus the phase of the commercial frequency voltage is usually the positive peak value or (b) voltage declines from 0 that (a) voltage rises from 0
Negative peak value, the absolute value for being applied to the voltage of hole is needed to increase to a certain degree, it is thus regarded that generating the phase of shelf depreciation
Position is intermediate following nearby.If be illustrated referring to the Fig. 4 for the commercial frequency voltage for indicating 1 phase to the situation, recognize
For in hole generate shelf depreciation when commercial frequency voltage phase be generally near the centre between 0 degree~90 degree to
Phase interval S until 90 degree1Or from the phase interval S near the centre of 180 degree~270 degree until 270 degree2。
(B) on the other hand, there is the point of conductor in electric machine 10 and divide it in the point and its opposing part
Between generate shelf depreciation in the case where, it is believed that be typically applied to the positive or negative of the commercial frequency voltage of spatial joint clearance between the two
Peak value nearby becomes phase when electric discharge starts.If be illustrated referring to Fig. 4 to the situation, then it is assumed that in the point of conductor
The phase of commercial frequency voltage when generating shelf depreciation, which is generally in, to be clipped 90 degree and is the phase interval S before and after it3Or
It clips 270 degree and is the phase interval S before and after it4.Wherein, the shelf depreciation of point is similar to needle end electric discharge phenomena, thus
As known, it may be said that there is following tendency in the electric discharge of needle end: point is in the phase interval S near negative peak value4More
It is easy to produce shelf depreciation.
If by described in (A) and (B) is comprehensively considered, then it is assumed that for the phase of commercial frequency voltage, electrically
The phase that shelf depreciation is easy to produce in machine 10 is usually near being near 0 degree~90 degree of centre to after 90 degree
Phase interval S only5Or from the phase interval S near the centre of 180 degree~270 degree until neighbouring after 270 degree6。
As described, source power supply 2 and electric machine 10 are usually 3 phases, thus referring to Fig. 5 to 3 phase the case where carry out
Explanation.The A phase, B phase, C phase phase that is staggered as unit of 120 degree respectively.As reference Fig. 4 explanation, the A phase of electric machine 10
Shelf depreciation be easy in the phase interval S being equivalent in Fig. 45, phase interval S6Phase interval SAMiddle generation.Similarly, electric
The shelf depreciation of the B phase of mechanism of qi device 10 is easy in the phase interval S being equivalent in Fig. 45, phase interval S6Phase interval SBIn
It generates, the shelf depreciation of the C phase of electric machine 10 is easy in phase interval SCMiddle generation.
Therefore, 1 phase of current detector 28 is arranged, such as A phase is used as and represents phase, and with the commercial frequency of phase electricity
Phase interval on the basis of the phase of pressure, before and after being 90 degree in the phase of the commercial frequency voltage of the A phase or before and after 270 degree
SAWhen detect shelf depreciation in the case where, a possibility that shelf depreciation is generated in the A phase of electric machine 10, is high.Similarly, in A
The phase of the commercial frequency voltage of phase is the phase interval S of 30 degree of front and backs or 210 degree of front and backsBWhen detect the feelings of shelf depreciation
A possibility that shelf depreciation is generated under condition, in the B phase of electric machine 10 is high.It is 150 in the phase of the commercial frequency voltage of A phase
The phase interval S of degree front and back or 330 degree of front and backsCWhen detect shelf depreciation in the case where, generation office in the C phase of electric machine 10
A possibility that portion discharges is high.
Therefore, as described, by making and saving determination data, which is by commercial frequency voltage component
Phase and the charging current i detected when being the phase0Value establish each other association gained, except monitoring shelf depreciation generate
Outside, also can determine in 3 phases of electric machine 10 which mutually generate shelf depreciation.
As referring to illustrated by Fig. 4, Fig. 5, partial discharge phenomenon is in the specific phase interval of commercial frequency voltage
It is high to concentrate a possibility that generating, thus data processing equipment 46 can also have following function: by the commercial frequency voltage component
Phase and the charging current i that detects when being the phase0Value establish the resulting determination data of association each other, according to commercialization
Voltage to frequency ingredient is divided, made and is saved each phase interval with 5 degree~30 degree of phase intervals for interval
Interior charging current i0Peak value as each phase interval charging current value determination data.It as described will measurement
Data are divided according to each phase interval, thus will be easier to generate shelf depreciation in determining which phase in 3 phases.
An example for dividing resulting determination data as described is shown in table 1.This be with 30 degree of examples for interval, but
It is not limited to 30 degree as interval.
[table 1]
Phase interval preferably with 5 degree~30 degree for interval be consider shelf depreciation generate phase it is unequal depending on.That is,
If being set as the interval less than 5 degree, almost disappeared with the meaning that phase interval is divided.If being set as being greater than between 30 degree
Every then each phase interval S shown in Fig. 5A, phase interval SB, phase interval SCPossibility closer to each other, obscuring with other phases
Property increases.
Obtain following discovery: partial discharge phenomenon is once generation, then substantially in each week of commercial frequency voltage
A possibility that generating in phase is high, thus data processing equipment 46 can also have following function: about filling for each phase interval
Electric current i0Value, found out for each phase interval commercial frequency voltage it is multiple week during average value, make and save
Using the average value as the charging current i in each phase interval0Value determination data.The average value is found out for example to be set to
The degree in 100 periods of commercial frequency voltage.Charging current i about each phase interval0Value, take commercialization as described
Average value during multiple weeks of voltage to frequency, even if thus there are accidental and abnormal charging currents due to the influence of noise etc.
i0Value, its influence can also be made to become very small, thus the reliability of determination data can be improved, to can further improve part
The monitoring precision of electric discharge.
An example for having taken the determination data of average value as described is shown in table 2.This is with 30 degree of examples for interval
Son, but be not limited to 30 degree as interval.
[table 2]
(2) shelf depreciation monitoring system
Fig. 6 indicates an example of shelf depreciation monitoring system of the invention.
The shelf depreciation monitoring system includes: to transmit the communication line 60 of signal；The multiple shelf depreciation monitoring arrangement
20, it is respectively provided with telecommunication circuit；And the data collection process device 62 of data center for being placed in center etc..Each shelf depreciation
Monitoring arrangement 20 is respectively arranged at as supervision object by electric controller switching equipment, they are set to wide scope also dispersiblely
It is interior.
Communication line 60 can also be able to be wireless, can also be optical link etc. to be wired.It can be network communication circuit, can also be
Internet etc..
The signal processing apparatus 30 of each shelf depreciation monitoring arrangement 20 have via communication line 60 and receiving and transmitting signal it is logical
Believe circuit.Its an example is shown in Fig. 3.The signal processing apparatus 30 has telecommunication circuit 56, and the telecommunication circuit 56 is via communication
Route 60 and be sent in the determination data in data processing equipment 46 making and saving as described, and receive from data collection
The command signal that processing unit 62 is sent via communication line 60.In the case where communication line 60 is wireless, communication electricity
Road 56 carries out exchanging for signal via antenna 58 and between communication line 60.
Referring again to Fig. 6, data collection process device 62 includes: the telecommunication circuit of receiving and transmitting signal via communication line 60
64；And transacter 66 (data collection module), via the telecommunication circuit 64 at intervals of set time via communication line
Road 60 provides each shelf depreciation monitoring arrangement 20 instruction for sending the determination data, and collects at this moment and save each part
The determination data that electric discharge monitoring arrangement 20 is saved.Can also further have aftermentioned decision maker 68.The data collection
Processing unit 62 for example comprising with processing unit, storage device and man-machine interface (man machine interface) (such as
Input/output unit, display device etc.) computer.
According to the shelf depreciation monitoring system, data collection process device can be utilized via communication line 60 and at a distance
62 are collected simultaneously the determination data of multiple shelf depreciation monitoring arrangements 20, thus can be monitored simultaneously at a distance and office is respectively set
Shelf depreciation in multiple electric machines by electric controller switching equipment of portion's electric discharge monitoring arrangement 20.
The transacter 66 of data collection process device 62 can also have following function: collection is provided by weather information
The weather information that person 70 provides via communication line 60, the weather information include that each shelf depreciation monitoring arrangement 20 is arranged
Each region and to collect the weather and humidity in the period of the determination data, when shelf depreciation monitoring dress is arranged
It, will be from this when the weather for setting in the period of the collection determination data of 20 region is rain or snow or humidity is specified value or more
The determination data that shelf depreciation monitoring arrangement 20 is collected forecloses and is saved.
Weather information supplier 70 is, for example, the meteorological Room or civil weather information offer company etc..
Humidity is usually general used relative humidity.When the humidity is high, for example, humidity be 90% or more when carry out
The excluded processing.
It obtains following discovery: being rain or snow or in humidity high period in weather, there are generate part in electric machine 10
A possibility that electric discharge phenomena etc. in atmosphere other than electric discharge.Therefore, the determination data of such period is excluded as described
Outside, the reliability of determination data thus can be improved, to can further improve the monitoring precision of shelf depreciation.
The transacter 66 of data collection process device 62 can also have following function: making and save expression and be directed to
The trend data of the time passage of the determination data of the collection of each shelf depreciation monitoring arrangement 20.And data collection process fills
Setting 62 can also have decision maker 68 (judging unit), and the decision maker 68 is based on for each shelf depreciation monitoring arrangement 20
The trend data, to determine the charging current i contained in the trend data0Value whether during the prescribed period in increase rule
Tentering degree or more, and determine whether the state of the increase continue for specified time limit, determine to be arranged when continue for specified time limit
Shelf depreciation is produced in the electric machine 10 by electric controller switching equipment 4 of the shelf depreciation monitoring arrangement 20.
By charging current i contained in the trend data0Value time passage outline example be shown in Fig. 7.
Obtain following discovery: the shelf depreciation in electric machine 10 is hastily to generate, and once generate when generating, then
Its long lasting for a possibility that it is high, companion is as it does so, as shown in the portion A in such as Fig. 7, discharge current i contained in trend data0
Value also rapidly increase, and the state of the increase is for a long time.Therefore, determine charging current i contained in trend data0's
It is worth whether during the prescribed period interior (b) (a) increase regulation amplitude or more, and determines whether the state of (c) increase continue for providing
Period, the influence of electric discharge phenomena other than shelf depreciation etc. thus can be excluded, and correctly determine shelf depreciation and generate.
The specified time limit of the judgement of (a) is, for example, 2~3 or 5 days~6 days or so.The rule of the judgement of (b)
Tentering degree for example can also be charging current i0Value itself (i.e. absolute value), can also for variation ratio.If indicating numerical value
Concrete example then for example determines charging current i in the former case0Value increase 50 μ A or more, sentence in the latter case
Determine charging current i0The ratio of value increase 50% or more.
Obtain following discovery: Leakage Current caused by the pollution on the surface of electric machine 10 etc. not rapidly increase but with
, by (a) described in addition and judgement (b), can will charge electricity as caused by the Leakage Current by being gradually increased time
Flow i0Value increase with generated by shelf depreciation caused by charging current i0The increase of value be distinguish.Therefore, office can be improved
The judgement precision that portion's electric discharge generates.
The specified time limit of the lasting judgement of (c) may be, for example, 1 month, but also short than 1 month, also than 1 month
It is long.
Obtain following discovery: the case where shelf depreciation monitoring arrangement 20 detects extraneous noise or be arranged part put
Electric monitoring arrangement 20 be exposed to by electric controller switching equipment 4 high humility it is inferior in the case where, even if the charging current i detected0's
Value increases, which will not for a long time, by the lasting judgement of (c) described in addition, can will be by the noise, high humidity
Charging current i caused by degree etc.0Value increase and the charging current i as caused by shelf depreciation0The increase of value be distinguish.
Therefore, the judgement precision of shelf depreciation generation can be improved.
Claims (3)
1. a kind of shelf depreciation monitoring arrangement supervises the shelf depreciation generated in the electric machine by electric controller switching equipment
Depending on, it is described by electric controller switching equipment be by metal container store apply commercial frequency voltage voltage bus and be connected to
1 or more the electric machine of the voltage bus and constitute, the shelf depreciation monitoring arrangement is characterized in that:
(a) insulator of built-in capacitor is contained in and accommodates the made of metal of the electric machine for being used as supervision object and holds
In device, one end of the capacitor is electrically connected at the voltage bus in the metal container, and the other end is electrically connected with
Ground, the capacitor supply the charging current with the shelf depreciation to the electric machine for producing the shelf depreciation,
(b) setting detects the charging current for flowing through the earthed circuit on the earthed circuit of the capacitor
Current detector,
It (c) further include the signal processing device detected to the value of the charging current detected by the current detector
It sets,
(d) and, the insulator of built-in the capacitor doubles as being supporting insulator, and the supporting insulator is in the made of metal
The voltage bus is supported from ground potential portion in container,
(e) it is arranged in series partial pressure electricity container in the insulator and in the ground side of the capacitor, and be configured to
The alternating voltage for the commercial frequency that the partial pressure electricity container is shared is taken out from the insulator to outside,
(f) include alternating voltage for receiving the commercial frequency that the partial pressure electricity container being removed is shared, and will be described
Alternating voltage is converted to DC voltage and the DC power supply circuit that exports,
(g) power supply by the output of the DC power supply circuit as the signal processing apparatus.
2. shelf depreciation monitoring arrangement according to claim 1, it is characterised in that:
The signal processing apparatus includes:
(a) it extracts unit out, extracts commercial frequency voltage component out from the signal detected by the current detector；
(b) phase decision unit determines the phase of the commercial frequency voltage component；And
(c) data processing unit, makes and saves determination data, and the determination data is by the commercial frequency voltage component
Phase is established each other with the value for the charging current detected when the phase is associated with gained.
3. a kind of shelf depreciation monitoring system, communication line, multiple shelf depreciation monitoring arrangements and number including transmitting signal
According to collection and treatment device, characterized by comprising:
(A) each shelf depreciation monitoring arrangement supervises the shelf depreciation generated in the electric machine by electric controller switching equipment
Depending on, described by electric controller switching equipment is constituted by storing 1 or more the electric machine in metal container,
(a) insulator of built-in capacitor is contained in and accommodates the made of metal of the electric machine for being used as supervision object and holds
In device, one end of the capacitor is electrically connected at the voltage bus in the metal container, and the other end is electrically connected with
Ground, the capacitor supply the charging current with the shelf depreciation to the electric machine for producing the shelf depreciation,
(b) setting detects the charging current for flowing through the earthed circuit on the earthed circuit of the capacitor
Current detector,
It (c) further include the signal processing device detected to the value of the charging current detected by the current detector
It sets,
(d) and, the signal processing apparatus includes: extraction unit, is extracted out from the signal detected by the current detector
Commercial frequency voltage component；Phase decision unit determines the phase of the commercial frequency voltage component；Data processing unit, system
Make and save determination data, the determination data is by the phase of the commercial frequency voltage component and detection when being the phase
The value of the charging current arrived establishes association gained each other；And the telecommunication circuit of receiving and transmitting signal via the communication line；
(B) the data collection process device
(a) it includes the telecommunication circuit and data collection module of receiving and transmitting signal, the data collection via the communication line
Unit provides each shelf depreciation monitoring arrangement via the communication line send the determination data at intervals of set time
Instruction, and collect and save the determination data saved by each shelf depreciation monitoring arrangement at this moment,
(b) and, the data collection module collects the meteorological letter provided by weather information supplier via the communication line
Breath, the weather information include be arranged each shelf depreciation monitoring arrangement each region and to collect the measurement number
According to period in weather, when in the period of the collection determination data for the region that the shelf depreciation monitoring arrangement is arranged
Weather be rain or snow or when humidity is specified value or more, the determination data that will be collected from the shelf depreciation monitoring arrangement
It forecloses and is saved.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-051429 | 2014-03-14 | ||
| JP2014051429A JP6331521B2 (en) | 2014-03-14 | 2014-03-14 | Partial discharge monitoring device and partial discharge monitoring system |
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| Publication Number | Publication Date |
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| CN104914358A CN104914358A (en) | 2015-09-16 |
| CN104914358B true CN104914358B (en) | 2019-05-28 |
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| JP6553303B2 (en) * | 2016-09-01 | 2019-07-31 | 株式会社東芝 | Partial discharge monitoring system |
| EP3577475A1 (en) | 2017-03-02 | 2019-12-11 | Rosemount Inc. | Trending functions for partial discharge |
| US11067639B2 (en) | 2017-11-03 | 2021-07-20 | Rosemount Inc. | Trending functions for predicting the health of electric power assets |
| JP6894533B2 (en) * | 2017-12-21 | 2021-06-30 | 東芝三菱電機産業システム株式会社 | Power converter |
| US11181570B2 (en) | 2018-06-15 | 2021-11-23 | Rosemount Inc. | Partial discharge synthesizer |
| JP7127730B2 (en) * | 2019-02-25 | 2022-08-30 | 日新電機株式会社 | voltage transformer |
| WO2020174522A1 (en) * | 2019-02-25 | 2020-09-03 | 日新電機株式会社 | Intermediate electrode structure, transformer using same, and partial discharge detector |
| JP7276009B2 (en) * | 2019-08-29 | 2023-05-18 | 富士電機株式会社 | DISCHARGE DETECTION DEVICE AND DISCHARGE DETECTION METHOD |
| US11313895B2 (en) | 2019-09-24 | 2022-04-26 | Rosemount Inc. | Antenna connectivity with shielded twisted pair cable |
| JP2021076544A (en) * | 2019-11-13 | 2021-05-20 | 富士電機株式会社 | Discharge detector |
| CN112540272B (en) * | 2020-11-23 | 2024-04-02 | 重庆大学 | GIS equipment mechanical vibration abnormal sound defect simulation system and method |
| JP2023064849A (en) * | 2021-10-27 | 2023-05-12 | 日東工業株式会社 | Discharge detection unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS611173U (en) * | 1984-06-11 | 1986-01-07 | 株式会社東芝 | Electrical insulator |
| JPS6219774A (en) * | 1985-07-18 | 1987-01-28 | Toshiba Corp | Measuring method for partial electric discharge of high voltage equipment |
| JPH087250B2 (en) * | 1989-07-31 | 1996-01-29 | 三井石油化学工業株式会社 | Insulation deterioration monitoring device for electrical equipment |
| JPH0455770A (en) * | 1990-06-26 | 1992-02-24 | Fuji Electric Co Ltd | Partial discharge monitor |
| JP2670948B2 (en) * | 1992-09-30 | 1997-10-29 | 株式会社高岳製作所 | Partial discharge monitoring method |
| SE515387C2 (en) * | 1995-05-02 | 2001-07-23 | Abb Research Ltd | Monitoring of internal partial discharges in a power transformer |
| JP3254963B2 (en) * | 1995-05-19 | 2002-02-12 | 日立電線株式会社 | Method for removing external noise in partial discharge measurement system |
| JPH0980111A (en) * | 1995-09-14 | 1997-03-28 | Toshiba Corp | Partial discharge detection apparatus |
| JPH1172532A (en) * | 1997-08-28 | 1999-03-16 | Toshiba Corp | Insulation degradation detector and voltage detector |
| JP2000329813A (en) * | 1999-05-18 | 2000-11-30 | Mitsubishi Electric Corp | Partial discharge detecting device |
| US6489782B1 (en) * | 2000-12-21 | 2002-12-03 | Eaton Corporation | Electrical system with a stand-off insulator-sensor for on-line partial discharge monitoring of the state of high-voltage insulation |
| JP2006138687A (en) * | 2004-11-11 | 2006-06-01 | Mitsubishi Electric Corp | Device for remotely monitoring partial discharge of rotating machine |
| JP5224825B2 (en) * | 2008-01-11 | 2013-07-03 | 株式会社東芝 | Insulation monitoring device |
| JP4949314B2 (en) * | 2008-04-18 | 2012-06-06 | 株式会社ジェイ・パワーシステムズ | Partial discharge measurement method |
| JP5493909B2 (en) * | 2010-01-25 | 2014-05-14 | 日新電機株式会社 | Partial discharge position locating method and apparatus therefor |
| CN203444070U (en) * | 2013-09-17 | 2014-02-19 | 南京麟派电力工程有限公司 | Externally-arranged power equipment partial discharge monitoring device |
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2014
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| CN104914358A (en) | 2015-09-16 |
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