CN209280789U - A kind of device measuring capacitance current by arc suppression coil - Google Patents
A kind of device measuring capacitance current by arc suppression coil Download PDFInfo
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- CN209280789U CN209280789U CN201822078764.9U CN201822078764U CN209280789U CN 209280789 U CN209280789 U CN 209280789U CN 201822078764 U CN201822078764 U CN 201822078764U CN 209280789 U CN209280789 U CN 209280789U
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Abstract
The utility model discloses a kind of devices that capacitance current is measured by arc suppression coil, which includes shell, and the shell is for carrying each component；Processor, the processor are located at the enclosure interior；Line is measured, the measurement line passes through the shell and is connected with the processor.Device provided by the present application, directly from the capacitance current of arc suppression coil secondary side measurement power distribution network, compared with traditional test method, the device is not necessarily to and primary side is come into contacts with, because the risk of test may be not present, without doing many and diverse safety measure and waiting interminable traffic order, only measurement line need to be connected to arc suppression coil can measure the data of capacitance current.The device shows that menu in Chinese operates very easy and small in size, light-weight using color touch screen, carry out outdoor study easy to carry, wiring is simple, and test speed is fast, data accuracy is high, significantly reduces the labor intensity of testing crew, improves work efficiency.
Description
Technical field
The utility model relates to measuring device technical fields, pass through extinguishing arc more particularly to a kind of ground connection for power distribution network
The device of coil measurement capacitance current.
Background technique
Domestic existing medium voltage network is generally the system of isolated neutral, with the development of supply network, especially
Cable run increasingly increases, so that electric capacity and current with single-phase earthing in system is continuously increased, causes power grid in singlephase earth fault, electricity
Capacitance current is excessive, can not automatic arc extinguishing, generate very high overvoltage.
China's electrical equipment design specification regulation will be using neutral point through extinguishing arc when earthing capacitance current is more than certain value
Coil earthing mode.Therefore, on the one hand measurement distribution network system capacitive earth current facilitates the adjusting of relay protection constant value, separately
On the one hand also foundation can be provided for selection arc suppression coil capacity, so the true value for understanding capacitance current of distribution network size is relatively attached most importance to
It wants.
Traditional capacitance current measuring method has direct method and two kinds of indirect method.
Direct method is that Single Phase Metal is grounded method, can directly measure the capacitance current, active leakage current and conduct of power grid
The total current of sum of the two, but the method operation and wiring are complicated, and are likely to result in ungrounded phase insulation weakness damage
It is all dangerous to operator and distribution system to causing line to line fault, it is general it is not recommended that using.
Indirect method includes the additional capacitance method of neutral point, applied voltage method, tuning method, frequency variation method and capacitance increase method.Indirectly
Measurement method is fairly simple, if can accurately measure capacitance current value using proper, obtains and meets the data that scene needs.
But when implementing indirect measurement method there is still a need for distribution major loop is directly contacted, personnel still cannot protect with equipment safety
Card.Additionally, due to being directly related to primary circuit, therefore cumbersome, the safe preparation time is long, usual most of the time consumption
Expense prepares in safety measure waiting traffic order, open work ticket, grid switching operation etc., and working efficiency is very low.
Voltage transformer alien frequencies signal injection method is the representative of indirect method, and this method is opened from bus-bar potential transformer secondary side
Mouth triangle injects the different current signal of each and every one several frequencies, and the amplitude and phase for passing through measurement injecting voltage and Injection Current are closed
System, solves the direct-to-ground capacitance value of route.
Above method requires to disengage the arc suppression coil of neutral point, can measure effective capacitance current.It
Drawback be exactly need out the first work ticket at substation operation scene, while the PT method of operation be also must be taken into consideration it is important
Factor increases workload, often cannot largely apply.
Utility model content
The utility model provides a kind of device that capacitance current is measured by arc suppression coil.
The utility model provides following scheme:
A kind of device measuring capacitance current by arc suppression coil, comprising:
Shell, the shell is for carrying each component；
Processor, the processor are located at the enclosure interior；
Line is measured, the measurement line passes through the shell and is connected with the processor；The measurement line is used for and arc blowout wire
Circle realizes electrical connection；
The processor is used to inject the current signal of different frequency to the arc suppression coil by the measurement line, so as to
Capacitance current of distribution network value is calculated by vector analysis.
It is preferred: touch screen to be provided on the shell, the touch screen is electrically connected with the processor.
It is preferred: printing mechanism to be set on the shell, the printing mechanism is connected with the processor.
It is preferred: to be provided with power switch on the shell.
It is preferred: to be provided with power outlet on the shell.
According to specific embodiment provided by the utility model, the utility model discloses following technical effects:
By the utility model, a kind of device that capacitance current is measured by arc suppression coil may be implemented, in a kind of realization
Under mode, the apparatus may include shell, the shell is for carrying each component；Processor, the processor are located at the shell
Internal portion；Line is measured, the measurement line passes through the shell and is connected with the processor；The measurement line is used for and arc suppression coil
Realize electrical connection；The processor is used to inject the current signal of different frequency to the arc suppression coil by the measurement line,
Capacitance current of distribution network value is calculated will pass through vector analysis.It is provided by the present application that capacitance current is measured by arc suppression coil
Device, the directly capacitance current from arc suppression coil secondary side measurement power distribution network, compared with traditional test method, which is not necessarily to
It comes into contacts with primary side, because the risk of test may be not present, without doing many and diverse safety measure and waiting interminable scheduling life
It enables, only measurement line need to be connected to arc suppression coil can measure the data of capacitance current.The device uses color touch screen display
Show, menu in Chinese, operation is very easy and small in size, light-weight, and carry out outdoor study easy to carry, wiring is simple, test speed
Degree is fast, and data accuracy is high, significantly reduces the labor intensity of testing crew, improves work efficiency.
Certainly, any product for implementing the utility model does not necessarily require achieving all the advantages described above at the same time.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is that a kind of structure of device that capacitance current is measured by arc suppression coil provided by the embodiment of the utility model is shown
It is intended to；
Fig. 2 is a kind of another knot of device that capacitance current is measured by arc suppression coil provided by the embodiment of the utility model
Structure schematic diagram；
Fig. 3 is neutral by arc extinction coil grounding power distribution network schematic diagram provided by the embodiment of the utility model；
Fig. 4 is arc suppression coil provided by the embodiment of the utility model+mutual inductor internal resistance leakage inductance+direct-to-ground capacitance equivalent circuit
Figure.
In figure: shell 1, measurement line 2, touch screen 3, printing mechanism 4, power switch 5, power outlet 6.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art's every other embodiment obtained, all belongs to
In the range of the utility model protection.
Embodiment
Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, capacitor is measured by arc suppression coil for one kind provided by the embodiment of the utility model
The device of electric current, as shown in Figure 1 and Figure 2, the device include shell 1, and the shell 1 is for carrying each component；
Processor (not shown), the processor are located at the enclosure interior；
Line 2 is measured, the measurement line 2 passes through the shell 1 and is connected with the processor；The measurement line 2 is used for and disappears
Arc coil realizes electrical connection；
The processor is used to inject the current signal of different frequency to the arc suppression coil by the measurement line 2, with
It will pass through vector analysis and calculate capacitance current of distribution network value.
Further, it is provided on the shell 1 and touches 3 screens, the touch screen 3 is electrically connected with the processor.
Printing mechanism 4 is set on the shell 1, the printing mechanism 4 is connected with the processor.It is set on the shell
It is equipped with power switch 5.Power outlet 6 is provided on the shell.
The basic ideas of device provided by the present application are that the current signal of different frequency is injected by arc suppression coil, pass through arrow
It measures analysis meter and calculates capacitance current of distribution network value, device measuring principle provided by the present application is described in detail below:
Fig. 3 is the power distribution network schematic diagram of neutral by arc extinction coil grounding, indicates an isolated neutral system, neutral
Point can be grounded through arc suppression coil L.C is the sum of stray capacitance over the ground of the equivalent system.On bus, one group of three mutual induction of voltage
The secondary of device PT is connected into open delta.L, N are its lead-out wire code name.
By the way that a voltage source, under the action of this voltage, the identical PT's of three characteristics is added to the arc suppression coil in figure
Secondary coil, the amplitude of the voltage of each leisure one secondary coil induction, phase are all identical.Namely 1,2,3 point of three-phase bus same electricity
Position, can be considered as a bit, therefore, according to the superposition principle of linear circuit, circuit shown in Fig. 1 can be further simplified as Fig. 4.
Be marked in Fig. 4 voltage transformer and route conversion to secondary open delta end equivalent resistance and inductance
(resistance and leakage inductance in the main winding for considering voltage transformer), the exciting current of voltage transformer is ignored.In figure C be with
Power grid three-phase ground capacitance is converted to the equivalent capacity behind secondary open delta end.The arc suppression coil of compensation of ground point capacitance current
It is in parallel with three-phase ground capacitance.
Arc suppression coil does not exit (K closed state), and system direct-to-ground capacitance is in parallel with arc suppression coil, makes equivalent circuit by simple
The double loop circuit that thickens of RLC series loop.
By injecting the voltage signal u of one group of angular frequency to the arc suppression coil in figure, current signal i, electric current letter are measured
Phase difference ∮ number with voltage signal.It needs to measure several impedances with several different angular frequencies:
Several unknown numbers in RLC equivalent circuit are calculated from formula (1), (2), (3) and (4).
Wherein the π of ω=2 f, u and i is measurement voltage, current data,
The real part of formula (4) is loop resistance:
Its imaginary part is related with frequency:
To solve several unknown number L and C, as long as injecting the voltage signal of several different frequencies, several groups of voltage u and electricity are measured
The phase difference for flowing signal i and electric current and voltage, obtains two equations of simultaneous
It can solve:
System capacitive current:
UNIt is grid line voltage.
According to statistics, capacitor is excessive and can not voluntarily cease arc when the failure of power distribution network is largely due to route single-phase earthing
It is caused.Therefore, electric power regulation regulation should install extinguishing arc when 10kV and 35kV system capacitive current is respectively greater than 30A and 10A
For coil with compensating electric capacity electric current, this requires measure the capacitance current of distribution to make a decision.
In addition, the direct-to-ground capacitance of power distribution network and the parameter coordination of PT can generate PT ferro-resonance over-voltage, in order to verify this
Whether distribution system can occur PT resonance and the resonance of what property occurs, it is also necessary to the direct-to-ground capacitance of accurate measurement power distribution network
Value.
The device provided by the present application that capacitance current is measured by arc suppression coil, directly matches from arc suppression coil secondary side measurement
The capacitance current of power grid, compared with traditional test method, which is not necessarily to and primary side is come into contacts with, because test may be not present
Risk, without doing many and diverse safety measure and waiting interminable traffic order, only measurement line need to be connected to arc suppression coil can
To measure the data of capacitance current.The device shows that menu in Chinese, operation is very easy, and volume using color touch screen
Small, light-weight, carry out outdoor study easy to carry, wiring is simple, and test speed is fast, and data accuracy is high, significantly reduces examination
The labor intensity for testing personnel, improves work efficiency.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The above is only the preferred embodiment of the utility model only, is not intended to limit the protection model of the utility model
It encloses.Any modification, equivalent substitution, improvement and etc. made within the spirit and principle of the present invention, are all contained in this reality
With in novel protection scope.
Claims (5)
1. a kind of device for measuring capacitance current by arc suppression coil characterized by comprising
Shell, the shell is for carrying each component；
Processor, the processor are located at the enclosure interior；
Line is measured, the measurement line passes through the shell and is connected with the processor；The measurement line is used for and arc suppression coil reality
Now it is electrically connected；
The processor is used to inject the current signal of different frequency to the arc suppression coil by the measurement line, will pass through
Vector analysis calculates capacitance current of distribution network value.
2. the device according to claim 1 for measuring capacitance current by arc suppression coil, which is characterized in that on the shell
It is provided with touch screen, the touch screen is electrically connected with the processor.
3. the device according to claim 1 for measuring capacitance current by arc suppression coil, which is characterized in that on the shell
It is set to printing mechanism, the printing mechanism is connected with the processor.
4. the device according to claim 1 for measuring capacitance current by arc suppression coil, which is characterized in that on the shell
It is provided with power switch.
5. the device according to claim 1 for measuring capacitance current by arc suppression coil, which is characterized in that on the shell
It is provided with power outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822078764.9U CN209280789U (en) | 2018-12-12 | 2018-12-12 | A kind of device measuring capacitance current by arc suppression coil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822078764.9U CN209280789U (en) | 2018-12-12 | 2018-12-12 | A kind of device measuring capacitance current by arc suppression coil |
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| CN209280789U true CN209280789U (en) | 2019-08-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113295950A (en) * | 2021-05-20 | 2021-08-24 | 南方电网科学研究院有限责任公司 | Method and device for determining active arc extinction control parameters and storage medium |
-
2018
- 2018-12-12 CN CN201822078764.9U patent/CN209280789U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113295950A (en) * | 2021-05-20 | 2021-08-24 | 南方电网科学研究院有限责任公司 | Method and device for determining active arc extinction control parameters and storage medium |
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