CN108132422A - A kind of monitoring system and method for capacitive reactive power compensation device failure - Google Patents
A kind of monitoring system and method for capacitive reactive power compensation device failure Download PDFInfo
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- CN108132422A CN108132422A CN201711327807.6A CN201711327807A CN108132422A CN 108132422 A CN108132422 A CN 108132422A CN 201711327807 A CN201711327807 A CN 201711327807A CN 108132422 A CN108132422 A CN 108132422A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
Abstract
A kind of monitoring system and method for capacitive reactive power compensation device failure belongs to reactive power compensator malfunction monitoring technical field.The problem of present invention is to be attached most importance to solve existing capacitive reactive power compensation device fault monitoring system with capacitor group, and current-limiting reactor occurs to be valid protected during turn-to-turn short circuit, and final catching fire brings about great losses.The present invention installs potential and current transformers respectively in three-phase, extract the three-phase phase voltage signal of voltage transformer secondary side and the three-phase phase current signal of Current Transformer Secondary side, by six road synchronous acquisition of capture card after signal conditioning circuit improves, three-phase medium loss factor is calculated based on harmonic analysis method by microcontroller later and sends supreme position machine, data will be calculated to compare with setting valve, the capacitive reactive power compensation device for being more than or less than variable quantity certain value sends out failure alarm signal.The common early warning of the present invention capacitor group and current-limiting reactor failure suitable for capacitive reactive power compensation device.
Description
Technical field
The present invention relates to a kind of monitoring system and methods of reactive power compensator failure, and in particular to one kind for capacitive without
The monitoring system and method for Reactive power compensation installations failure belongs to reactive power compensator malfunction monitoring technical field.
Background technology
Reactive power compensation device is improving power factor of electric network and power quality, reduces line transmission loss etc. hair
Wave vital effect.Capacitive reactive power compensation device is since itself active loss is small, maintenance workload is small and to system
The advantages that stable influence is small becomes main reactive-load compensation equipment, is widely used in power grid.So capacitive reactive power compensation dress
Put the operational safety that reliability of operation largely affects entire electric system.
Power capacitor internal structure is complicated, in addition the factors such as outdoor running environment is severe and artificial influence, through long
After time oepration at full load, the case that capacitor group breaks down is commonplace.Such as manufacturing process is bad, temperature is excessively high, mistake
The factors such as voltage and harmonic component are excessive make capacitor the problems such as component ageing, breakdown occur, cause high-voltage parallel electric indirectly
The damage of container group or even it will appear the serious equipment breakdowns such as bulge, group be quick-fried.In addition, current-limiting reactor is as capacitor
It is the device very sensitive to overvoltage, overcurrent and higher hamonic wave, so reactor interturn short circuit fault rate remains high.
The fault monitoring method of existing capacitive reactive power compensation device has is supervised based on dielectric dissipation factor monitoring, based on capacitance
It surveys, based on partial discharge monitoring and based on three phase unbalance current monitoring etc..But above-mentioned fault monitoring method is all with capacitance
Device group is attached most importance to, and can not be spread when shorted-turn fault occurs for current-limiting reactor by effective early warning and excision, short-circuit trend
Final catching fire brings heavy losses, while jeopardize worker safety to power grid.
Therefore, a kind of common monitoring for capacitor group and current-limiting reactor failure in capacitive reactive power compensation device is probed into
System and method is of great significance.
Invention content
The brief overview about the present invention is given below, in order to provide about the basic of certain aspects of the invention
Understand.It should be appreciated that this general introduction is not the exhaustive general introduction about the present invention.It is not intended to determine the pass of the present invention
Key or pith, nor is it intended to limit the scope of the present invention.Its purpose only provides certain concepts in simplified form,
In this, as the preamble in greater detail discussed later.
In consideration of it, the object of the present invention is to provide a kind of monitoring system for capacitive reactive power compensation device failure and sides
Method solves existing capacitive reactive power compensation device fault monitoring system monitoring capacitor group, when current-limiting reactor breaks down
Can not effective early warning the problem of.
Scheme one：The present invention provides a kind of monitoring system for capacitive reactive power compensation device failure, including three electricity
Pressure sensor, three current transformers, signal conditioning circuit, capture card, microcontroller, memory and host computer；
Three-phase bus is connected respectively with current-limiting reactor, capacitor group and current-limiting reactor series connection, capacitor group end with
Neutral point is connected, and three voltage transformers extract capacitive reactive power compensation device three-phase voltage signal, three current transformers respectively
Three-phase phase current signal is extracted respectively；
The voltage signal output end of three voltage transformers and the current signal output end of three current transformers all connect
It is connected to the conditioned signal input terminal of signal conditioning circuit, conditioned signal output terminal and the capture card input terminal phase of signal conditioning circuit
Even；
Signal conditioning circuit is filtered and is converted to the three-phase voltage and current signal of capacitive reactive power compensation device
Into the signal for meeting capture card acquisition requirement, capture card carries out six road synchronous acquisitions to six groups of signals；
Capture card output terminal is connected to single-chip microcomputer input, the number of the digital signal output end connection memory of microcontroller
Signal input part, the storage signal input part of the storage signal output end connection microcontroller of memory, microcontroller digital signal are defeated
Outlet is connected with host computer digital signal input end.
Further：Include in host computer：Receive single-chip data module.
Further：It will receive data and adjust data comparison module, obtain dielectric dissipation factor variable quantity.
Further：Fault warning module is sent, current-limiting reactor event is sent when dielectric dissipation factor variable quantity is more than 2%
Hinder alarm, when dielectric dissipation factor variable quantity be less than -20%, send capacitor group fault warning.
Scheme two：The present invention provides a kind of monitoring methods for capacitive reactive power compensation device failure, rely on scheme
The one monitoring device realization, specially：
Step 1：Capacitive reactive power compensation device three-phase voltage is obtained by voltage transformer and current transformer and electric current is believed
Number, three-phase voltage and current signal are sent into signal conditioning circuit filtering and conversion, then by six road synchronous acquisition of capture card；
Step 2：Three-phase voltage and current signal are carried out Fourier space exhibition by method of the microcontroller based on frequency analysis
It opens, numerical value of the capacitive reactive power compensation device per phase medium loss factor is calculated；
Step 3：Microcontroller is calculated into gained data transfer to host computer and the setting valve with prestoring carries out comparison and obtains often
Phase medium loss factor variable quantity；
Step 4：It is gone here and there in early warning capacitive reactive power compensation device when numerical value is more than 2% when dielectric dissipation factor becomes larger and changes
Connection reactor break down, when dielectric dissipation factor become smaller and numerical value be more than 20% when early warning capacitive reactive power compensation device in capacitance
Device group breaks down, and capacitive reactive power compensation device state is normal in the case of remaining, without sending out fault pre-alarming.
Further：Microcontroller is based on harmonic analysis method in step 2, and three-phase voltage and current signal are carried out Fourier
Dielectric dissipation factor numerical value is calculated in series expansion：
Wherein, Vu(t) it is the voltage value of t moment, Vi(t) it is t moment current value, f0For fundamental frequency, ai0For ViDirect current
Component, au0For VuDC component, aikWith aukIt is signal V respectivelyiAnd VuK order harmonic components imaginary part, bikWith bukIt is respectively
Signal ViAnd VuK order harmonic components real part, σ is dielectric loss angle, and P is active power, and Q is reactive power, and R is phase resistance,
X is phase reactance, and T is the primitive period.
Further：In step 4, monitored in capacitive reactive power compensation device and gone here and there jointly according to dielectric dissipation factor variable quantity
Join the failure of reactor and capacitor group, making up existing capacitive reactive power compensation device cannot effective early warning current-limiting reactor failure
Defect.
This method by monitor the common early warning current-limiting reactor of each phase medium loss factor variable quantity and capacitor group therefore
Barrier.
Advantageous effect：
Potential and current transformers are installed respectively in three-phase, extract voltage transformer secondary side three-phase phase voltage signal and
The three-phase phase current signal of Current Transformer Secondary side, by six road synchronous acquisition of capture card after signal conditioning circuit improves,
Three-phase medium loss factor is calculated based on harmonic analysis method by microcontroller later and sends supreme position machine, will calculate data with
Setting valve is compared, and the capacitive reactive power compensation device that certain value is more than or less than to variable quantity sends out failure alarm signal.This
Invent the common early warning of capacitor group and current-limiting reactor failure suitable for capacitive reactive power compensation device.
Description of the drawings
Fig. 1 is the schematic diagram for measuring dielectric dissipation factor；
Fig. 2 is the equivalent circuit diagram of dry-type air-core reactor under normal circumstances；
Fig. 3 is an equivalent circuit diagram when circle short trouble occurs in dry-type air-core reactor；
Fig. 4 is the equivalent circuit diagram of capacitor group under normal circumstances；
Fig. 5 is equivalent circuit diagram of the capacitor group under separate unit breakdown fault.
Specific embodiment
The exemplary embodiment of the present invention is described hereinafter in connection with attached drawing.For clarity and conciseness,
All features of actual implementation mode are not described in the description.It should be understood, however, that developing any this actual implementation
It must be made during example much specific to the decision of embodiment, to realize the objectives of developer, for example, symbol
Conjunction and system and those relevant restrictive conditions of business, and these restrictive conditions may have with the difference of embodiment
Changed.In addition, it will also be appreciated that although development is likely to be extremely complex and time-consuming, to having benefited from the present invention
For those skilled in the art of disclosure, this development is only routine task.
Herein, it is also necessary to which explanation is a bit, in order to avoid because having obscured the present invention during unnecessary details, in the accompanying drawings
The apparatus structure closely related with scheme according to the present invention and/or processing step are illustrate only, and is omitted and the present invention
The little other details of relationship.
Embodiment 1：As shown in Figure 1, a kind of monitoring system for capacitive reactive power compensation device failure of the present embodiment, packet
It includes three voltage sensors, 201, three current transformers 202, signal conditioning circuit 203, capture card 204, microcontroller 205, deposit
Reservoir 206 and host computer 207；
Three-phase bus is connected respectively with current-limiting reactor, capacitor group and current-limiting reactor series connection, capacitor group end with
Neutral point is connected, and three voltage transformers 201 extract capacitive reactive power compensation device three-phase voltage signal, three Current Mutual Inductances respectively
Device 202 extracts three-phase phase current signal respectively；
The voltage signal output end of three voltage transformers 201 and the current signal output end of three current transformers 202
The conditioned signal input terminal of signal conditioning circuit 203 is all connected to, the conditioned signal output terminal of signal conditioning circuit 203 is with adopting
204 input terminal of truck is connected；
Signal conditioning circuit 203 is filtered the three-phase voltage and current signal of capacitive reactive power compensation device and by its turn
Change the signal for meeting the acquisition requirement of capture card 204 into, capture card 204 carries out six road synchronous acquisitions to six groups of signals；
204 output terminal of capture card is connected to 205 input terminal of microcontroller, and the digital signal output end connection of microcontroller 205 is deposited
The digital signal input end of reservoir 206, the storage signal input of the storage signal output end connection microcontroller 205 of memory 206
End, 205 digital signal output end of microcontroller are connected with 207 digital signal input end of host computer.
Further：Include in host computer：Receive single-chip data module, data will be received and adjust data comparison mould
Block obtains dielectric dissipation factor variable quantity；Fault warning module is sent, string is sent when dielectric dissipation factor variable quantity is more than 2%
Join Reactor Fault alarm, when dielectric dissipation factor variable quantity be less than -20%, send capacitor group fault warning.
Embodiment 2：The present embodiment relies on monitoring device described in embodiment 1 to realize, one kind of the present embodiment is used for capacitive
The monitoring method of reactive power compensator failure is through the following steps that realize：
Step 1：Capacitive reactive power compensation device three-phase voltage is obtained by voltage transformer and current transformer and electric current is believed
Number, three-phase voltage and current signal are sent into signal conditioning circuit filtering and conversion, then by six road synchronous acquisition of capture card；
Step 2：Three-phase voltage and current signal are carried out Fourier space exhibition by method of the microcontroller based on frequency analysis
It opens, numerical value of the capacitive reactive power compensation device per phase medium loss factor is calculated；
Step 3：Microcontroller is calculated into gained data transfer to host computer and the setting valve with prestoring carries out comparison and obtains often
Phase medium loss factor variable quantity；
Step 4：It is gone here and there in early warning capacitive reactive power compensation device when numerical value is more than 2% when dielectric dissipation factor becomes larger and changes
Connection reactor break down, when dielectric dissipation factor become smaller and numerical value be more than 20% when early warning capacitive reactive power compensation device in capacitance
Device group breaks down, and capacitive reactive power compensation device state is normal in the case of remaining, without sending out fault pre-alarming.
Further：Microcontroller is based on harmonic analysis method in step 2, and three-phase voltage and current signal are carried out Fourier
Dielectric dissipation factor numerical value is calculated in series expansion：
Wherein, Vu(t) it is the voltage value of t moment, Vi(t) it is t moment current value, f0For fundamental frequency, ai0For ViDirect current
Component, au0For VuDC component, aikWith aukIt is signal V respectivelyiAnd VuK order harmonic components imaginary part, bikWith bukIt is respectively
Signal ViAnd VuK order harmonic components real part, σ is dielectric loss angle, and P is active power, and Q is reactive power, and R is phase resistance,
X is phase reactance, and T is the primitive period.
Further：In step 4, monitored in capacitive reactive power compensation device and gone here and there jointly according to dielectric dissipation factor variable quantity
Join the failure of reactor and capacitor group, making up existing capacitive reactive power compensation device cannot effective early warning current-limiting reactor failure
Defect.
This method by monitor the common early warning current-limiting reactor of each phase medium loss factor variable quantity and capacitor group therefore
Barrier
More specifically：If current-limiting reactor both ends alternating voltage is, each branch current is, then can arrange and write series connection
The voltage matrix equations of reactor：
According to Fig. 1, the resistance R certainly of each layer winding of reactor is obtained respectively by resistance solution formula and Newman electromagnetism formulai、
Self-induction LiAnd the mutual inductance value M of interlayerij, bring into voltage matrix equations, in current-limiting reactor both ends alternating voltageBefore known
Put the current value that can be solved and flow through each layer windingSeries electrical can be obtained in the current value adduction of 1~n-layer winding
Anti- device total currentReactor impedance is obtained according to Ohm's law
Single capacitor capacitance C can be acquired by reactive power formula0：
According to Fig. 4, capacitor group total capacitance C is acquired by connection in series-parallel relationship1。
Capacitive reactive power compensation device branch total impedanceEqual to the adduction of reactor impedance and capacitor group impedance：
Branch dielectric dissipation factor is solved according to branch impedance：
P=I2R1=UIsin δ
Q=I2X1=UIcos δ
Reactor Fault is nearly all the shorted-turn fault as caused by a variety of causes, for consersion unit failure as early as possible,
Using a circle short circuit as fault pre-alarming condition, capacitive reactive power compensation device dielectric dissipation factor changes before and after calculating a circle short circuit
Amount.Similarly, capacitive reactive power compensation device dielectric dissipation factor variable quantity before and after the breakdown of calculable capacitor group separate unit.
Corresponding voltage matrix equations are when turn-to-turn short circuit occurs for reactor：
According to fig. 3, current-limiting reactor is solved again in a circle short circuit shape using resistance solution formula and Newman electromagnetism formula
The resistance R certainly of each layer winding under statei', self-induction Li' and the mutual inductance value M of interlayerij', it brings matrix equation into and gradually solves series reactance
Total current of the device under a circle short-circuit conditionTotal impedancePhase of impedanceWith dielectric dissipation factor tan σ2, so capacitive without
Variable quantity of the Reactive power compensation installations dielectric dissipation factor before and after one circle short circuit of reactor be：
When separate unit breakdown fault occurs for capacitor group, according to Fig. 5, capacitor group is acquired by the connection in series-parallel relationship after breakdown
Total capacitance C2, phase of impedance is acquired therewithWith dielectric dissipation factor tan σ3, so capacitive reactive power compensation device dielectric dissipation factor
It is in the front and rear variable quantity of capacitor group separate unit breakdown：
It is found by parsing numerical value, the medium in capacitive reactive power compensation device during one circle short trouble of current-limiting reactor generation
Loss factor is compared increased under normal condition, and numerical value change amount is 2.61%~15.24%.Capacitor group occurs separate unit and hits
Dielectric dissipation factor is declined when wearing failure, and numerical value change amount is -25.16%.
When turn-to-turn short circuit and capacitor group generation separate unit breakdown fault occur for current-limiting reactor in capacitive reactive power compensation device
Dielectric dissipation factor changes in the opposite direction, and changes numerical value and be satisfied by monitoring accuracy.Therefore, using monitoring dielectric dissipation factor
Method can monitor the failure of current-limiting reactor and capacitor group in capacitive reactive power compensation device simultaneously.
Although disclosed embodiment is as above, its content is only to facilitate understand the technical side of the present invention
Case and the embodiment used, are not intended to limit the present invention.Any those skilled in the art to which this invention pertains, not
Under the premise of being detached from disclosed core technology scheme, any modification and change can be made in form and details in implementation
Change, but the protection domain that the present invention is limited, the range that the appended claims that must still be subject to limits.
Claims (7)
1. a kind of monitoring system for capacitive reactive power compensation device failure, which is characterized in that including three voltage sensors
(201), three current transformers (202), signal conditioning circuit (203), capture card (204), microcontroller (205), memory
(206) and host computer (207)；
Three-phase bus is connected respectively with current-limiting reactor, capacitor group and current-limiting reactor series connection, capacitor group end and neutrality
Point is connected, and three voltage transformers (201) extract capacitive reactive power compensation device three-phase voltage signal, three current transformers respectively
(202) three-phase phase current signal is extracted respectively；
The voltage signal output end of three voltage transformers (201) and the current signal output end of three current transformers (202)
It is all connected to the conditioned signal input terminal of signal conditioning circuit (203), the conditioned signal output terminal of signal conditioning circuit (203)
It is connected with capture card (204) input terminal；
Signal conditioning circuit (203) is filtered and is converted to the three-phase voltage and current signal of capacitive reactive power compensation device
Into the signal for meeting capture card (204) acquisition requirement, capture card (204) carries out six road synchronous acquisitions to six groups of signals；
Capture card (204) output terminal is connected to microcontroller (205) input terminal, the digital signal output end connection of microcontroller (205)
The digital signal input end of memory (206), the storage of the storage signal output end connection microcontroller (205) of memory (206)
Signal input part, microcontroller (205) digital signal output end are connected with host computer (207) digital signal input end.
2. a kind of monitoring system for capacitive reactive power compensation device failure according to claim 1, which is characterized in that on
Include in the machine of position：Receive single-chip data module.
3. a kind of monitoring system for capacitive reactive power compensation device failure according to claim 1, which is characterized in that will
Receive data and adjust data comparison module, obtain dielectric dissipation factor variable quantity.
A kind of 4. monitoring system for capacitive reactive power compensation device failure according to claim 1, which is characterized in that hair
Send fault warning module, when dielectric dissipation factor variable quantity be more than 2% send current-limiting reactor fault warning, when dielectric loss because
Number variable quantity is less than -20%, sends capacitor group fault warning.
5. it is realized based on the monitoring system described in claim 1-4 any one a kind of for capacitive reactive power compensation device failure
Monitoring method, which is characterized in that the specific steps are：
Step 1：Capacitive reactive power compensation device three-phase voltage and current signal are obtained by voltage transformer and current transformer,
Three-phase voltage and current signal are sent into signal conditioning circuit filtering and conversion, then by six road synchronous acquisition of capture card；
Step 2：Three-phase voltage and current signal are carried out Fourier expansion, meter by method of the microcontroller based on frequency analysis
It calculates and obtains numerical value of the capacitive reactive power compensation device per phase medium loss factor；
Step 3：By microcontroller calculate gained data transfer to host computer and the setting valve with prestoring carry out comparison obtain per mutually be situated between
Matter loss factor variable quantity；
Step 4：When dielectric dissipation factor become larger and change numerical value more than 2% when early warning capacitive reactive power compensation device in series electrical
Anti- device breaks down, when dielectric dissipation factor become smaller and numerical value be more than 20% when early warning capacitive reactive power compensation device in capacitor group
It breaks down, capacitive reactive power compensation device state is normal in the case of remaining, without sending out fault pre-alarming.
A kind of 6. monitoring method for capacitive reactive power compensation device failure according to claim 5, which is characterized in that step
Microcontroller is based on harmonic analysis method in rapid two, and three-phase voltage and current signal are carried out Fourier expansion is calculated medium
Loss factor numerical value：
Wherein, Vu(t) it is the voltage value of t moment, Vi(t) it is t moment current value, f0For fundamental frequency, ai0For ViDirect current point
Amount, au0For VuDC component, aikWith aukIt is signal V respectivelyiAnd VuK order harmonic components imaginary part, bikWith bukIt is letter respectively
Number ViAnd VuK order harmonic components real part, σ is dielectric loss angle, and P is active power, and Q is reactive power, and R is phase resistance, X
For phase reactance, T is the primitive period.
A kind of 7. monitoring method for capacitive reactive power compensation device failure according to claim 5, which is characterized in that step
In rapid four, current-limiting reactor and capacitor group in capacitive reactive power compensation device are monitored according to dielectric dissipation factor variable quantity jointly
Failure, make up existing capacitive reactive power compensation device cannot effectively early warning current-limiting reactor failure the defects of.
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| CN109297716A (en) * | 2018-10-23 | 2019-02-01 | 西安热工研究院有限公司 | A kind of double feed wind power generator vibrating failure diagnosis method |
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| CN109541339A (en) * | 2018-10-26 | 2019-03-29 | 苏州华电电气股份有限公司 | Power transformer bears short-circuit capacity pilot system |
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| CN109297716A (en) * | 2018-10-23 | 2019-02-01 | 西安热工研究院有限公司 | A kind of double feed wind power generator vibrating failure diagnosis method |
| CN109449887A (en) * | 2018-10-26 | 2019-03-08 | 杭州沃伦森电气有限公司 | Capacitor group branch impedance performance monitoring systems |
| CN109541339A (en) * | 2018-10-26 | 2019-03-29 | 苏州华电电气股份有限公司 | Power transformer bears short-circuit capacity pilot system |
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| CN109387734A (en) * | 2018-12-25 | 2019-02-26 | 哈尔滨理工大学 | Dry-type hollow power reactor shorted-turn fault on-Line Monitor Device and its monitoring method |
| CN113260869A (en) * | 2019-01-04 | 2021-08-13 | Abb电网瑞士股份公司 | Device and method for monitoring a capacitor bank |
| CN113260869B (en) * | 2019-01-04 | 2024-04-16 | 日立能源有限公司 | Device and method for monitoring a capacitor bank |
| CN109888795A (en) * | 2019-02-22 | 2019-06-14 | 魏一凡 | A kind of real-time battery saving arrangement for improving power grid end power factor |
| CN112327076A (en) * | 2020-10-26 | 2021-02-05 | 国网山东省电力公司淄博供电公司 | Method for diagnosing running state of series dry type reactor based on tan delta difference |
| CN112290684A (en) * | 2020-11-11 | 2021-01-29 | 南京讯天游科技有限公司 | Reactive power compensation device monitoring system |
| CN114636952A (en) * | 2022-05-18 | 2022-06-17 | 广东电网有限责任公司佛山供电局 | System and method for diagnosing fault phase of capacitor bank |
| CN114994474A (en) * | 2022-05-30 | 2022-09-02 | 西安西电电力电容器有限责任公司 | Method and system for positioning parallel interlayer insulation fault of capacitance compensation device |
| CN114994474B (en) * | 2022-05-30 | 2023-12-19 | 西安西电电力电容器有限责任公司 | Method and system for positioning parallel interlayer insulation faults of capacitance compensation device |
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