CN109254206A - Highly resistance electric parameter on-Line Monitor Device and method - Google Patents
Highly resistance electric parameter on-Line Monitor Device and method Download PDFInfo
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- CN109254206A CN109254206A CN201811240374.5A CN201811240374A CN109254206A CN 109254206 A CN109254206 A CN 109254206A CN 201811240374 A CN201811240374 A CN 201811240374A CN 109254206 A CN109254206 A CN 109254206A
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- 238000000034 method Methods 0.000 title claims description 9
- 230000007935 neutral effect Effects 0.000 claims abstract description 65
- 238000012544 monitoring process Methods 0.000 claims abstract description 30
- 230000005611 electricity Effects 0.000 claims description 8
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 3
- 238000002309 gasification Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000003862 health status Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004227 thermal cracking Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
- G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/001—Measuring real or reactive component; Measuring apparent energy
- G01R21/002—Measuring real component
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/001—Measuring real or reactive component; Measuring apparent energy
- G01R21/003—Measuring reactive component
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of highly resistance electric parameter on-Line Monitor Devices, including voltage transformer, current transformer, neutral point current mutual inductor, neutral point CT measuring unit, highly resistance on-line monitoring local unit, data acquisition unit and monitoring host computer；On-Line Monitor Device of the invention obtains highly resistance end instantaneous voltage fundametal compoment using voltage transformer and neutral point current mutual inductor COMPREHENSIVE CALCULATING, and then calculating the loss ratio and inductance value that can accurately measure highly resistance current state, the short circuit that may occur according to loss ratio and inductance value the two parameter prediction highly resistances simultaneously provides alarm；Once monitored highly resistance loss ratio, inductance value are abnormal, operator on duty can receive alarm signal immediately, accurately to formulate appropriate processing scheme, reduce failure and loss in power operation.
Description
Technical field
The present invention relates to circuit arrangement field more particularly to a kind of highly resistance electric parameter on-Line Monitor Devices and method.
Background technique
Currently, most super-pressure, ultra-high voltage transformer station are all installed with oil immersed type shunt reactor, oil immersed type electricity in parallel
Anti- device is directly parallel in the primary side of main transformer, commonly referred to as " highly resistance ".
Since highly resistance is the primary side for being directly parallel in main transformer, voltage is very high, and highly resistance and main transformer share
One group of breaker, once catastrophe failure occurs in highly resistance, breaker can trip immediately, cause large area blackout, or even jeopardize
The safety of entire power grid.Therefore, highly resistance can be monitored on-line in real time, issues alarm signal in accident early stage, carries out
Planned interruption maintenance is very great to the meaning for improving power supply reliability and guarantee power grid security.
Highly resistance will appear various failures, wherein it is more than defined for sharply increasing the most serious is highly resistance internal pressure
Upper limit value, Voltage release device act, and the oil and gas in fuel tank spray outward from Voltage release device, and the microswitch on Voltage release device starts open circuit
Device tripping, main transformer will move out operation at this time.
The reason of highly resistance Voltage release device acts usually highly resistance coil has a shorted-turn fault, short-circuited conducting sleeve temperature in a short time
It rising rapidly, the transformer oil contacted with short-circuited conducting sleeve is by thermal cracking, gasification, and at this moment, the tank internal pressure of highly resistance steeply rises,
To trigger Voltage release device movement.
There is a point that turn-to-turn short circuit occurs in highly resistance coil, this reactor has reformed into an actual self coupling transformation
Device, and the no-load voltage ratio of this auto-transformer is very big --- and on high-tension side the number of turns is approximately equal to the number of turns of reactor, and low-pressure side only has
One circle and low-pressure side short circuit operation.The electric current of low-pressure side is very big known to the principle of ampere-turn equilibrium, so big short circuit current
The huge heating power generated in short-circuited conducting sleeve can cause to release in a short time by part oil-breaking, the gasification in reactor
Depressor movement.
To avoid highly resistance from breaking down suddenly when operations staff is unwitting, main transformer is caused to trip, needed pair
The health status of highly resistance is monitored on-line.For theoretically, as long as the single-phase reactor that one is currently running can be collected
Hold instantaneous voltage and the current instantaneous value by this reactor, so that it may which the reactive power for calculating this reactor (is held
Amount), active power (loss), loss ratio, inductance value, if this reactor has occurred shorted-turn fault, loss ratio is willing
Surely it is higher than rated value, inductance value is certainly smaller than rated value.
But practical problem is:
(a) currently, the neutral point of most highly resistance is grounded by low reactance, i.e., the A phase of one group reactor, B phase,
The neutral point of C phase connects in the end of incoming cables of low reactance, and the leading-out terminal of low reactance is directly grounded, then, it can not just pass through mutual induction of voltage
Device secondary side voltage directly calculates every phase voltage of one group of reactor.Due to the end voltage of every reactor be it is uncertain, because
This, the actual operation parameters of every reactor are unknown quantitys, can not be passed through shorted-turn fault occurs for certain reactor
The method of measurement electric parameter is learnt.
(b) since the magnetic conductivity of transformer core is nonlinear, and there are saturation problem, contain in no-load current
60% or so triple-frequency harmonics, secondly, having the presence of other a large amount of harmonic sources in system, so that containing harmonic wave point in system voltage
Amount；Due to the non-linear and system voltage distortion factor of reactor direct impedance, so that the electric current by reactor contains harmonic wave
Component.
For these reasons, i.e., enabled end instantaneous voltage, the current instantaneous value for collecting reactor, as these
The reason of amount is not sine wave, directly utilizes their calculating reactance device parameters, will cause biggish deviation, causes device to be failed to report
Or false alarm.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of highly resistance electric parameter on-Line Monitor Device and methods, accurate to supervise
The loss ratio and inductance value for surveying highly resistance provide early warning at the initial stage that short circuit occurs for highly resistance, reduce fault and loss.
In order to solve the above technical problems, the technical solution adopted by the present invention are as follows: a kind of highly resistance electric parameter on-line monitoring dress
It sets, including voltage transformer, current transformer, neutral point current mutual inductor, neutral point CT measuring unit, highly resistance on-line monitoring are just
Ground unit, data acquisition unit and monitoring host computer；
Voltage transformer and current transformer access bus circuit, and for three-phase circuit, voltage transformer is general
It needs to include A phase voltage mutual inductor, B phase voltage mutual inductor and C phase voltage mutual inductor, current transformer includes A phase current mutual inductance
Device, B phase current mutual inductor and C phase current mutual inductor；
Neutral point current mutual inductor connects small reactor on neutral point, and one end of neutral point current mutual inductor primary side connects neutral point
The leading-out terminal of low reactance, the other end are directly grounded；
The current instantaneous value of neutral point CT measuring unit acquisition neutral point current mutual inductor secondary side simultaneously carries out FFT change to it
It changes and obtains neutral point current instantaneous value fundametal compoment, neutral point CT measuring unit transmits neutral point current instantaneous value fundametal compoment
Local unit is monitored on-line to highly resistance；
Highly resistance monitors the reactance that local unit utilizes neutral point current instantaneous value fundametal compoment and small reactor on neutral point on-line
Value calculates neutral point voltage instantaneous value fundametal compoment；
Highly resistance monitors local unit collection voltages mutual inductor secondary side instantaneous voltage on-line and carries out FFT transform to it and obtains
Voltage transformer instantaneous voltage fundametal compoment is obtained, subtracts neutral point voltage using voltage transformer instantaneous voltage fundametal compoment
Instantaneous value fundametal compoment obtains highly resistance end instantaneous voltage fundametal compoment；
Highly resistance on-line monitoring local unit, which acquires Current Transformer Secondary side current instantaneous value and carries out FFT transform to it, to be obtained
Obtain highly resistance current instantaneous value fundametal compoment；
Highly resistance monitors local unit on-line and utilizes highly resistance end instantaneous voltage fundametal compoment and highly resistance current instantaneous value fundamental wave
Component calculates reactive power, active power, loss ratio and the inductance value of highly resistance and calculated result is transferred to data acquisition unit；
Data acquisition unit stores reactive power, active power, loss ratio and the inductance value of highly resistance and by loss ratio and electricity
Inductance value is transferred to monitoring host computer；
Monitoring host computer compares loss ratio and loss ratio rated value, and inductance value and inductance rated value are compared, if loss
Difference than being greater than loss threshold value or inductance value and inductance rated value with the difference of loss ratio rated value is greater than inductance threshold value, prison
Control host control alarm device sounds an alarm.
The present invention also provides a kind of highly resistance electric parameter on-line monitoring methods, it is characterised in that includes the following steps:
Step 1: voltage transformer and current transformer are accessed into bus circuit；
Step 2: neutral point current mutual inductor is accessed at small reactor on neutral point；
Step 3: the current instantaneous value of acquisition neutral point current mutual inductor secondary side simultaneously carries out FFT transform acquisition neutrality to it
Point current instantaneous value fundametal compoment；
Step 4: calculating neutral point electricity using the reactance value of neutral point current instantaneous value fundametal compoment and small reactor on neutral point
Press instantaneous value fundametal compoment；
Step 5: collection voltages mutual inductor secondary side instantaneous voltage simultaneously carries out FFT transform acquisition voltage transformer electricity to it
Press instantaneous value fundametal compoment；
Step 6: subtracting neutral point voltage instantaneous value fundametal compoment using voltage transformer instantaneous voltage fundametal compoment and obtain
Obtain highly resistance end instantaneous voltage fundametal compoment；
Step 7: acquisition Current Transformer Secondary side current instantaneous value simultaneously carries out FFT transform to it to obtain high anti-current instantaneous
It is worth fundametal compoment；
Step 8: calculating highly resistance using highly resistance end instantaneous voltage fundametal compoment and highly resistance current instantaneous value fundametal compoment
Reactive power, active power, loss ratio and inductance value；
Step 9: loss ratio and loss ratio rated value being compared, inductance value and inductance rated value are compared, if loss ratio
The difference for being greater than loss threshold value or inductance value and inductance rated value with the difference of loss ratio rated value is greater than inductance threshold value, utilizes
Alarm device sounds an alarm.
The utility model has the advantages that on-Line Monitor Device and method of the invention are comprehensive using voltage transformer and neutral point current mutual inductor
Total calculate obtains highly resistance end instantaneous voltage fundametal compoment, and then calculates the loss ratio that can accurately measure highly resistance current state
And inductance value, the short circuit that may occur according to loss ratio and inductance value the two parameter prediction highly resistances simultaneously provide alarm；Once by
Highly resistance loss ratio, the inductance value of monitoring are abnormal, and operator on duty can receive alarm signal immediately, and operator on duty is paying close attention to this
File regulation notice scheduling and leading body at a higher level, reactor manufacturer can also be handled while highly resistance by dependent failure, so as to
Accurately formulate appropriate processing scheme.On the other hand, the loss ratio of highly resistance and inductance value are stored by data acquisition unit, internal soft
Part can easily export chart and curve using historical data, and the operational data of round-the-clock record highly resistance facilitates staff
Timely called data studies high fault-resistant Producing reason.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of 1 highly resistance electric parameter on-Line Monitor Device of embodiment.
Specific embodiment
Invention is further described in detail With reference to embodiment.
Embodiment 1
As shown in Figure 1, the highly resistance electric parameter on-Line Monitor Device of the present embodiment, including voltage transformer, Current Mutual Inductance
Device, neutral point current mutual inductor, neutral point CT measuring unit, highly resistance on-line monitoring local unit, data acquisition unit, monitoring master
Machine and alarm device；
Voltage transformer and current transformer access three-phase bus circuit；Voltage transformer include A phase voltage mutual inductor,
B phase voltage mutual inductor and C phase voltage mutual inductor, current transformer include A phase current mutual inductor, B phase current mutual inductor and C phase electricity
Current transformer；
Neutral point current mutual inductor connects small reactor on neutral point, and one end of neutral point current mutual inductor primary side connects neutral point
The leading-out terminal of low reactance, the other end are directly grounded；
Neutral point CT measuring unit connects neutral point current mutual inductor and highly resistance monitors local unit on-line, and highly resistance is supervised online
It surveys local unit and connects data acquisition unit, data acquisition unit connects monitoring host computer.
The workflow of the present embodiment highly resistance electric parameter on-Line Monitor Device is:
(1) neutral point CT measuring unit acquires the current instantaneous value of neutral point current mutual inductor secondary side and carries out to it
FFT transform obtains neutral point current instantaneous value fundametal compoment, and neutral point CT measuring unit is to neutral point current instantaneous value fundamental wave point
Amount carries out A/D conversion and is then passed to highly resistance on-line monitoring local unit；
(2) highly resistance on-line monitoring local unit utilizes the electricity of neutral point current instantaneous value fundametal compoment and small reactor on neutral point
Anti- value calculates neutral point voltage instantaneous value fundametal compoment；
(3) highly resistance monitors local unit collection voltages mutual inductor secondary side instantaneous voltage on-line and carries out FFT change to it
It changes and obtains voltage transformer instantaneous voltage fundametal compoment；
(4) highly resistance monitors local unit on-line and subtracts neutral point voltage using voltage transformer instantaneous voltage fundametal compoment
Instantaneous value fundametal compoment obtains highly resistance end instantaneous voltage fundametal compoment；
(5) highly resistance on-line monitoring local unit acquires Current Transformer Secondary side current instantaneous value and carries out FFT change to it
It changes and obtains highly resistance current instantaneous value fundametal compoment；
(6) highly resistance on-line monitoring local unit utilizes highly resistance end instantaneous voltage fundametal compoment and highly resistance current instantaneous value base
Wave component calculates reactive power, active power, loss ratio and the inductance value of highly resistance, and highly resistance on-line monitoring local unit will calculate
Reactive power, active power, loss ratio and inductance value be transferred to data acquisition unit；
(7) data acquisition unit stores reactive power, active power, loss ratio and the inductance value of each highly resistance, and by this
A little data are transferred to monitoring host computer；
(8) monitoring host computer compares loss ratio and loss ratio rated value, and inductance value and inductance rated value are compared, if damage
Loss-rate and the difference of loss ratio rated value are greater than loss threshold value or inductance value and the difference of inductance rated value is greater than inductance threshold value,
Monitoring host computer triggers alarm device (concrete type of alarm device is configured by practical application request unrestricted choice).
Although embodiments of the present invention are illustrated in specification, these embodiments are intended only as prompting,
It should not limit protection scope of the present invention.It is equal that various omission, substitution, and alteration are carried out without departing from the spirit and scope of the present invention
It should be included within the scope of the present invention.
Claims (2)
1. a kind of highly resistance electric parameter on-Line Monitor Device, it is characterised in that: including voltage transformer, current transformer, neutrality
Point current transformer, neutral point CT measuring unit, highly resistance on-line monitoring local unit, data acquisition unit and monitoring host computer；
Voltage transformer and current transformer access bus circuit；
Neutral point current mutual inductor connects small reactor on neutral point；
Neutral point CT measuring unit acquires the current instantaneous value of neutral point current mutual inductor secondary side and carries out FFT transform to it and obtains
Neutral point current instantaneous value fundametal compoment is obtained, neutral point CT measuring unit transmits neutral point current instantaneous value fundametal compoment supreme
Anti- on-line monitoring local unit；
Highly resistance monitors the reactance value meter that local unit utilizes neutral point current instantaneous value fundametal compoment and small reactor on neutral point on-line
Calculate neutral point voltage instantaneous value fundametal compoment；
Highly resistance on-line monitoring local unit collection voltages mutual inductor secondary side instantaneous voltage simultaneously carries out FFT transform acquisition electricity to it
Mutual inductor instantaneous voltage fundametal compoment is pressed, it is instantaneous to subtract neutral point voltage using voltage transformer instantaneous voltage fundametal compoment
It is worth fundametal compoment and obtains highly resistance end instantaneous voltage fundametal compoment；
Highly resistance on-line monitoring local unit acquisition Current Transformer Secondary side current instantaneous value simultaneously carries out FFT transform acquisition height to it
Anti-current instantaneous value fundametal compoment；
Highly resistance monitors local unit on-line and utilizes highly resistance end instantaneous voltage fundametal compoment and highly resistance current instantaneous value fundametal compoment
It calculates reactive power, active power, loss ratio and the inductance value of highly resistance and calculated result is transferred to data acquisition unit；
Data acquisition unit stores reactive power, active power, loss ratio and the inductance value of highly resistance and by loss ratio and inductance value
It is transferred to monitoring host computer；
Monitoring host computer compares loss ratio and loss ratio rated value, and inductance value and inductance rated value are compared, if loss ratio with
The difference of loss ratio rated value is greater than loss threshold value or inductance value and the difference of inductance rated value is greater than inductance threshold value, monitoring master
Machine control alarm device sounds an alarm.
2. a kind of highly resistance electric parameter on-line monitoring method, it is characterised in that include the following steps:
Step 1: voltage transformer and current transformer are accessed into bus circuit；
Step 2: neutral point current mutual inductor is accessed at small reactor on neutral point；
Step 3: the current instantaneous value of acquisition neutral point current mutual inductor secondary side simultaneously carries out FFT transform acquisition neutral point electricity to it
Flow instantaneous value fundametal compoment；
Step 4: calculating neutral point voltage wink using the reactance value of neutral point current instantaneous value fundametal compoment and small reactor on neutral point
Duration fundametal compoment；
Step 5: collection voltages mutual inductor secondary side instantaneous voltage simultaneously carries out FFT transform acquisition voltage transformer voltage wink to it
Duration fundametal compoment；
Step 6: subtracting neutral point voltage instantaneous value fundametal compoment using voltage transformer instantaneous voltage fundametal compoment and obtain height
Anti- end instantaneous voltage fundametal compoment；
Step 7: acquisition Current Transformer Secondary side current instantaneous value simultaneously carries out FFT transform acquisition highly resistance current instantaneous value base to it
Wave component；
Step 8: calculating the idle of highly resistance using highly resistance end instantaneous voltage fundametal compoment and highly resistance current instantaneous value fundametal compoment
Power, active power, loss ratio and inductance value；
Step 9: loss ratio and loss ratio rated value being compared, inductance value and inductance rated value are compared, if loss ratio and damage
The difference of loss-rate rated value is greater than loss threshold value or inductance value and the difference of inductance rated value is greater than inductance threshold value, utilizes alarm
Device sounds an alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811240374.5A CN109254206A (en) | 2018-10-24 | 2018-10-24 | Highly resistance electric parameter on-Line Monitor Device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811240374.5A CN109254206A (en) | 2018-10-24 | 2018-10-24 | Highly resistance electric parameter on-Line Monitor Device and method |
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| CN109254206A true CN109254206A (en) | 2019-01-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110927441A (en) * | 2019-11-07 | 2020-03-27 | 安徽先兆科技有限公司 | Single-phase multi-loop electric comprehensive monitoring system |
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| CN106707030A (en) * | 2016-11-11 | 2017-05-24 | 高政 | Method and device for measuring grounding impedance and power loss of distribution transformer |
| CN210269995U (en) * | 2018-10-24 | 2020-04-07 | 西安欣东源电气有限公司 | High-resistance electrical parameter online monitoring device |
-
2018
- 2018-10-24 CN CN201811240374.5A patent/CN109254206A/en active Pending
Patent Citations (5)
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| JP2009273348A (en) * | 2008-04-07 | 2009-11-19 | Mitsubishi Electric Corp | Motor drive device, refrigerating air conditioner and motor drive method |
| CN103605015A (en) * | 2013-10-24 | 2014-02-26 | 西安欣东源电气有限公司 | Device and method for high-precision electric parameter measurement dry-type reactor online monitoring |
| WO2016144491A1 (en) * | 2015-03-11 | 2016-09-15 | Siemens Energy, Inc. | Generator neutral ground monitoring device utilizing direct current component measurement and analysis |
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| CN110927441A (en) * | 2019-11-07 | 2020-03-27 | 安徽先兆科技有限公司 | Single-phase multi-loop electric comprehensive monitoring system |
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