CN106896287A - The on-line monitoring method of power capacitor working condition in reactive power compensator - Google Patents
The on-line monitoring method of power capacitor working condition in reactive power compensator Download PDFInfo
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- CN106896287A CN106896287A CN201710240762.2A CN201710240762A CN106896287A CN 106896287 A CN106896287 A CN 106896287A CN 201710240762 A CN201710240762 A CN 201710240762A CN 106896287 A CN106896287 A CN 106896287A
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- reactive power
- voltage
- power compensator
- power
- capacitor
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
Abstract
The on-line monitoring method of power capacitor working condition in reactive power compensator, belongs to substation equipment condition monitoring technical field.Comprise the following steps：Step 1001, starts；Step 1002, obtains busbar voltage；Step 1003, obtains power capacitor working voltage；Step 1004 ~ 1005, obtain and decompose current signal；Step 1006, obtains the reactive power of power capacitor；Step 1007, severe conditions perform step 1008 and otherwise perform step 1009；Step 1008, sends trip command；Step 1009, abnormality performs step 1010 and otherwise performs step 1011.Step 1010 is alarmed；Step 1011, continues to run with.Reactive-load compensation equipment running status is evaluated by the multiple parameters for detecting reactive-load compensation equipment in operation, solve needs the drawbacks of the detecting and cannot carry out evaluation of running status to the change of quantity of state that have a power failure in the prior art.
Description
Technical field
The on-line monitoring method of power capacitor working condition in reactive power compensator, belongs to substation equipment condition monitoring skill
Art field.
Background technology
To ensure power system security economical operation, it is ensured that quality of voltage, the reactive power demand of resistance inductive load is met,
Need that substantial amounts of complete reactive power compensator is installed on the load bus of transformer station, mainly by outlet switch cabinet, power capacitor,
Current-limiting reactor, disconnecting switch, earthed switch, high-tension fuse, metal oxide arrester, discharge coil, current transformer
Deng composition, current actual motion statistics shows：The accident rate of complete reactive power compensator remains high, and is in transformer station and owns
First of equipment, the economy and supply voltage quality of system operation are had a strong impact on.Wherein, power capacitor damages proportion most
Greatly, reason mainly has following aspect：
1st, the working voltage that power capacitor bears is higher, causes overload to run；The reactive power operation electricity of power capacitor
Pressure square is directly proportional, and power capacitor working voltage is raised, the heating and temperature rise of capacitor also can accordingly increase.Meanwhile, electricity
In power capacitor body the active power of dielectric loss also with voltage square and change, the loss is completely converted into heat energy and quilt
Consumption.It can be seen that：Working voltage is raised, and caloric value substantially increases, and easily causes the thermal breakdown of dielectric, causes electricity
Power capacitor is damaged.Other working voltage is high, and the field intensity of interior media is also big, the aging quickening of dielectric, shortening capatcitor
Life-span, so should strictly monitor and control the actual motion voltage of power capacitor in operation.
2nd, the loop current of power capacitor is significantly increased sometimes, but not associated overvoltage phenomenon, illustrates electric power electricity
There is higher hamonic wave in container loop current, also result in equipment heating and damage, it is therefore desirable to monitor reactive power compensator and return
Road electric current.
3rd, the power capacitor of reactive power compensator is often made up of many power capacitors or Series Parallel Elements, Ge Bieyuan
Part is damaged can make the voltage's distribiuting of electric capacitor device assembly shift, and cause the change of capacitance, cause the idle work(for sending
Rate is increased or decreased.Capacitor bank lacks platform operation, the improper fusing of single capacitor fuse can also cause the apparent of capacitor bank
Electric capacitance change, the reactive power for exporting reactive power compensator changes.Above reason all makes the temperature liter in its housing
Height, influences the safe operation of reactive power compensator, it is therefore desirable to monitor the situation of change of reactive power.
4th, reactive power compensator once puts into operation, is substantially and is run under full load condition, due to running environment temperature
Degree is high, and body temperature is also high, and capacitor runs under being in high field intensity, high-temperature, and dielectric loss increase, insulation ag(e)ing accelerate, are situated between
Matter disruptive discharge, causes thermal breakdown.The working voltage of reactive power compensator is controlled, the operation load of power capacitor can be also adjusted
Rate, so as to control operating temperature rise.
From the foregoing, in reactive power compensator, multiple operational factors and element can be to reactive power compensators
Synthetic operation state is reacted and is influenceed.And in the prior art, the needs when state-detection is carried out to reactive power compensator
Outage detection, and by different test equipments（Such as capacitance meter）Process is complex to be detected to different numerical value, by
In power-off measurement is needed, then cannot send carries out evaluation of running status to the change of quantity of state, therefore leverages reactive-load compensation
Device security in use.
The content of the invention
The technical problem to be solved in the present invention is：Overcome the deficiencies in the prior art, there is provided one kind is by nothing in detection operation
Work(compensates the multiple parameters of equipment, and the running status to reactive-load compensation equipment evaluates, solve need in the prior art it is right
The drawbacks of reactive-load compensation equipment carries out power failure detection and cannot carry out evaluation of running status to the change of quantity of state, it is proposed that nothing
The on-line monitoring method of power capacitor working condition in Reactive power compensation installations.
The technical solution adopted for the present invention to solve the technical problems is：Power capacitor work in the reactive power compensator
The on-line monitoring method of state, it is characterised in that：Be provided with to the current parameters of the reactive power compensator based on power detection and
The parameter measurement unit that voltage parameter is measured and processed, also comprises the following steps：
Step 1001, proceeds by the on-line monitoring method of power capacitor working condition in reactive power compensator；
Step 1002, the secondary side of substation bus bar voltage transformer where reactive power compensator is obtained by parameter measurement unit
Voltage signal U；
Step 1003, the working voltage signal of power capacitor in reactive power compensator is calculated by parameter measurement unit；
Step 1004, the electric current of reactive power compensator outlet switch cabinet Current Transformer Secondary side is obtained by parameter measurement unit
Signal I；
Step 1005, parameter measurement unit carries out Fourier transformation and obtains wherein resistive to the current signal I of reactive power compensator
Current component Ir and capacitive current component Ic；
Step 1006, parameter measurement unit is calculated the reactive power of power capacitor；
Whether step 1007, parameter measurement unit judges reactive power compensator in serious shape according to severe conditions decision rule
State, if being in severe conditions, performs step 1008, if being not in severe conditions, performs step 1009；
Step 1008, parameter measurement unit sends pressure regulation instruction or to its incoming line switch cabinet to on-load voltage regulation switch of power transformer
Breaker send trip command, make reactive power compensator out of service；
Step 1009, whether parameter measurement unit is according to abnormal state determination rule judgment reactive power compensator in abnormal shape
State, if being in abnormality, performs step 1010, if being not in abnormality, performs step 1011.
Step 1010, parameter measurement unit is alarmed the working condition of power capacitor in reactive power compensator；
Step 1011, power capacitor is in normal operating conditions, and reactive power compensator is continued to run with.
Preferably, whether the working voltage of described power capacitor exceedes its rated value, if it exceeds its rated value, then
Power capacitor is in serious working condition.
Preferably, the abnormality judgment rule in described step 1009 is：
The current signal I of outlet switch cabinet Current Transformer Secondary side exceedes the fortune of its specified be 1.3 times or power capacitor
Row magnitude of voltage Uc exceedes 1.1 times of its rated value or the reactive power Q c of power capacitor and exceedes 1.35 times of its rated value；
Three phases active power with the deviation ratio of its rated value is more than 5%；
Reactive power Q c is less than its rated value under rated voltage；
Represent that power capacitor is in abnormal operation when a period of time for meeting conditions above.
Preferably, described parameter measurement unit, including current acquisition module, voltage acquisition module, signal processing module,
The output end of logic analysis module and sound and light alarm module, current acquisition module and voltage acquisition module is while and signal transacting
The input of module is connected, and the output end of signal processing module is connected with the input of logic analysis module, logic analysis module
Output end connection sound and light alarm module.
Preferably, voltage transformer of the described voltage acquisition module connect setting in reactive power compensator substation bus bar
Secondary side.
Preferably, described current acquisition module connects the secondary of the current transformer of reactive power compensator outlet switch cabinet
Side.
Compared with prior art, the present invention is had an advantageous effect in that：
The on-line monitoring method of power capacitor working condition is idle compared with existing detection method in this reactive power compensator
During power capacitor normally works in compensation device, reactive power, electric current to the output of power capacitor, voltage are supervised in real time
Survey and analyze, can truly reflect its running status, can effectively find the not detectable equipment deficiency of experiment that has a power failure.Due to routine
Measuring method needs to be measured under power capacitor complexes power down mode, has overcurrent protection, overvoltage protection, quick-break to protect
Shield, out-of-balance current（Voltage）Protection, overload protection and one-phase ground protection, electric current not to actual motion, magnitude of voltage with
Being associated property of the reactive power analysis of output, with judgement reactive power compensator running status, criterion is relatively easy, without phase
Answer coordination control strategy.And the apparatus and method be under reactive power compensator actual operating mode measure reactive power, electric current,
Voltage, in system voltage or abnormal device, can immediately send alarm signal, or coordinate control converting station electric power transformation
The on-load voltage regulating switch of device, or trip command is sent to its breaker, extractor operation prevents power capacitor and
Fire, explosion accident.
Brief description of the drawings
Fig. 1 is the on-line monitoring method flow chart of power capacitor working condition in reactive power compensator.
Fig. 2 is the on-line monitoring method parameter measurement unit principle side of power capacitor working condition in reactive power compensator
Frame.
Specific embodiment
Fig. 1 ~ 2 are highly preferred embodiment of the present invention, and 1 ~ 2 the present invention will be further described below in conjunction with the accompanying drawings.
As shown in figure 1, in reactive power compensator power capacitor working condition on-line monitoring method, including following step
Suddenly：
Step 1001, starts；
Proceed by the on-line monitoring method of power capacitor working condition in reactive power compensator.
Step 1002, measurement obtains the voltage signal of substation bus bar；
In this reactive power compensator in the on-line monitoring method of power capacitor working condition, it is provided with to reactive power compensator
The operational factor parameter measurement unit that measures and process.As shown in Fig. 2 parameter measurement unit includes：Current acquisition mould
Block, voltage acquisition module, signal processing module, logic analysis module and sound and light alarm module.Current acquisition module and voltage
The output end of acquisition module is connected with the input of signal processing module simultaneously, the output end of signal processing module and logic analysis
The input of module is connected, the output end connection sound and light alarm module of logic analysis module.
Voltage acquisition module connect setting the voltage transformer of reactive power compensator substation bus bar secondary side, electric current
The secondary side of the current transformer of acquisition module connection reactive power compensator outlet switch cabinet, is respectively used to gather substation bus bar
Current signal in the voltage signal and reactive power compensator operating loop of voltage transformer secondary side.Signal processing module is used for
The parameter that current acquisition module and voltage acquisition module are collected is processed and logic analysis module is sent into, logic analysis mould
The current signal and voltage signal that block sends into voltage acquisition module and current acquisition module carry out further computing, if desired
Alarmed, then logic analysis module driving sound and light alarm module carries out sound and light alarm.
In this step, substation bus bar voltage transformer where reactive power compensator is obtained by voltage acquisition module
Secondary side obtains voltage signal U.
Step 1003, is calculated the working voltage signal of power capacitor；
Logic analysis module is according to formula：Uc=U/（1-ß）It is calculated the working voltage of power capacitor in reactive power compensator
Uc, wherein U believe for the voltage of the reactive power compensator place substation bus bar voltage transformer secondary side obtained in step 1002
Number, it is the reactance Rate of reactive power compensator.
Step 1004, obtains the current signal I of reactive power compensator；
The current signal I of reactive power compensator outlet switch cabinet Current Transformer Secondary side is obtained by current acquisition module.
Step 1005, decomposes the current signal I of reactive power compensator；
Logic analysis module carries out Fourier transformation to the current signal and obtains wherein resistive current component Ir and capacity current point
Amount Ic.
Step 1006, is calculated the reactive power of power capacitor；
Logic analysis unit is according to formula Qc=IcUc=IcU/（1-ß）Calculate power capacitor hair in reactive power compensator
The reactive power Q c for going out, wherein U are substation bus bar voltage transformer two where the reactive power compensator that obtains in step 1002
The voltage signal of secondary side, Ic is mutual to obtain reactive power compensator outlet switch cabinet electric current by current acquisition module in step 1005
Capacitive current component in the current signal I of sensor secondary side, is the reactance Rate of reactive power compensator.
Whether step 1007, judge power capacitor in severe conditions；
Whether logic analysis unit judges power capacitor is in serious working condition, and its basis for estimation is：Power capacitor
Whether working voltage exceedes 1.1 times of its rated value, if it exceeds 1.1 times of its rated value, then power capacitor is in serious
Working condition, performs step 1008, if working voltage is more than its rated value, performs step 1009.
Step 1008, sends pressure regulation or trip command；
Logic control element sends pressure regulation instruction or to the breaker of its incoming line switch cabinet to on-load voltage regulation switch of power transformer
Trip command is sent, makes reactive power compensator out of service.
Whether step 1009, judge power capacitor in abnormality；
Whether logic analysis unit judges power capacitor is in abnormal operation, and its basis for estimation is：
（1）The current signal I of outlet switch cabinet Current Transformer Secondary side exceedes its specified be 1.3 times or power capacitor
Working voltage value Uc exceedes 1.1 times of its rated value or the reactive power Q c of power capacitor and exceedes 1.35 times of its rated value；
（2）Three phases active power with the deviation ratio of its rated value is more than 5%；
（3）Reactive power Q c is less than its rated value under rated voltage.Now can determine that as capacitor bank has single capacitor to beat guarantor
Dangerous and out of service or single only damage.
Represent that power capacitor is in abnormal operation when a period of time for meeting conditions above, perform step 1001. no
Then perform step 1011.
Step 1010, carries out sound and light alarm；
Logic analysis unit driving sound and light alarm module carries out sound and light alarm.
Step 1011, continues to run with；
Power capacitor is in normal operating conditions, and logic analysis unit does not perform other operations, and reactive power compensator continues to transport
OK.
Specific work process and operation principle are as follows：
Work shape of the on-line monitoring method of power capacitor working condition to power capacitor in reactive power compensator is utilized
When state is monitored, transformer station where reactive power compensator is obtained by the voltage acquisition module in parameter measurement unit first female
The secondary side of line voltage transformer obtains voltage signal U, while obtain reactive power compensator outlet by current acquisition module opening
Close the current signal I of cabinet Current Transformer Secondary side, the signal processing module in parameter measurement unit by current acquisition module and
The parameter that voltage acquisition module is collected is processed and is sent into logic analysis module, by logic analysis module by voltage acquisition mould
The current signal and voltage signal of block and current acquisition module feeding carry out further computing.
Logic analysis module calculates the working voltage of power capacitor, and carries out Fourier transformation to current signal I and obtain
To resistive current component Ir therein and capacitive current component Ic, and further calculate the reactive power of power capacitor.Patrol
Collect analytic unit to be first compared the working voltage of power capacitor with its rated value, when the working voltage of power capacitor
During more than its rated value, logic control element sends pressure regulation instruction or to its service entrance switch to on-load voltage regulation switch of power transformer
The breaker of cabinet sends trip command, makes reactive power compensator out of service.
Then logic analysis unit is judged following condition：（1）The electricity of outlet switch cabinet Current Transformer Secondary side
Stream signal I exceedes 1.1 times or the electric power of the working voltage value Uc more than its rated value of its specified be 1.3 times or power capacitor
The reactive power Q c of capacitor exceedes 1.35 times of its rated value；（2）Three phases active power it is big with the deviation ratio of its rated value
In 5%；（3）Reactive power Q c is less than its rated value under rated voltage.Power capacitor is represented when a period of time for meeting conditions above
In abnormal operation, logic analysis module driving sound and light alarm module carries out sound and light alarm, when power capacitor is not in
When exception or severe conditions, then it represents that power capacitor is in normal operating conditions, logic analysis unit does not perform other operations,
Reactive power compensator is continued to run with.
The above, is only presently preferred embodiments of the present invention, is not the limitation for making other forms to the present invention, is appointed
What those skilled in the art changed possibly also with the technology contents of the disclosure above or be modified as equivalent variations etc.
Effect embodiment.But it is every without departing from technical solution of the present invention content, according to technical spirit of the invention to above example institute
Any simple modification, equivalent variations and the remodeling made, still fall within the protection domain of technical solution of the present invention.
Claims (6)
1. in reactive power compensator power capacitor working condition on-line monitoring method, it is characterised in that：It is provided with to being based on
The parameter measurement unit that the current parameters and voltage parameter of the reactive power compensator of power detection are measured and processed, also includes
Following steps：
Step 1001, starts the on-line monitoring method of power capacitor working condition in reactive power compensator；
Step 1002, the secondary side of substation bus bar voltage transformer where reactive power compensator is obtained by parameter measurement unit
Voltage signal U；
Step 1003, the working voltage signal of power capacitor is calculated by parameter measurement unit；
Step 1004, the electric current of reactive power compensator outlet switch cabinet Current Transformer Secondary side is obtained by parameter measurement unit
Signal I；
Step 1005, parameter measurement unit carries out Fourier transformation and obtains wherein resistive to the current signal I of reactive power compensator
Current component Ir and capacitive current component Ic；
Step 1006, parameter measurement unit is calculated the reactive power of power capacitor；
Whether step 1007, parameter measurement unit judges reactive power compensator in serious shape according to severe conditions decision rule
State, if being in severe conditions, performs step 1008, if being not in severe conditions, performs step 1009；
Step 1008, parameter measurement unit sends pressure regulation instruction or to its incoming line switch cabinet to on-load voltage regulation switch of power transformer
Breaker send trip command, make reactive power compensator out of service；
Step 1009, whether parameter measurement unit is according to abnormal state determination rule judgment reactive power compensator in abnormal shape
State, if being in abnormality, performs step 1010, if being not in abnormality, performs step 1011；
Step 1010, parameter measurement unit is alarmed the working condition of power capacitor in reactive power compensator；
Step 1011, power capacitor is in normal operating conditions, and reactive power compensator is continued to run with.
2. in reactive power compensator according to claim 1 power capacitor working condition on-line monitoring method, it is special
Levy and be：Whether the working voltage of described power capacitor exceedes its rated value, if it exceeds its rated value, then electric capacitor
Device is in serious working condition.
3. in reactive power compensator according to claim 1 power capacitor working condition on-line monitoring method, it is special
Levy and be：Abnormality judgment rule in described step 1009 is：
The current signal I of outlet switch cabinet Current Transformer Secondary side exceedes the fortune of its specified be 1.3 times or power capacitor
Row magnitude of voltage Uc exceedes 1.1 times of its rated value or the reactive power Q c of power capacitor and exceedes 1.35 times of its rated value；
Three phases active power is more than 5% with the deviation ratio of its rated value；
Reactive power Q c is less than its rated value under rated voltage；
Represent that power capacitor is in abnormal operation when a period of time for meeting conditions above.
4. in reactive power compensator according to claim 1 power capacitor working condition on-line monitoring method, it is special
Levy and be：Described parameter measurement unit, including current acquisition module, voltage acquisition module, signal processing module, logic analysis
The output end of module and sound and light alarm module, current acquisition module and voltage acquisition module is simultaneously defeated with signal processing module
Enter end to be connected, the output end of signal processing module is connected with the input of logic analysis module, the output end of logic analysis module
Connection sound and light alarm module.
5. in reactive power compensator according to claim 4 power capacitor working condition on-line monitoring method, it is special
Levy and be：Described voltage acquisition module connect setting reactive power compensator substation bus bar voltage transformer it is secondary
Side.
6. in reactive power compensator according to claim 4 power capacitor working condition on-line monitoring method, it is special
Levy and be：The secondary side of the current transformer of described current acquisition module connection reactive power compensator outlet switch cabinet.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109586318A (en) * | 2018-12-27 | 2019-04-05 | 武汉世纪精能科技发展有限公司 | Reactive-load compensation method, user equipment, storage medium and device |
| CN109884436A (en) * | 2019-03-19 | 2019-06-14 | 国网山东省电力公司淄博供电公司 | Power capacitor complexes on-line monitoring method |
| CN112666415A (en) * | 2020-12-18 | 2021-04-16 | 安徽链众电气科技有限公司 | Power capacitor on-line monitoring device |
| CN113203917A (en) * | 2021-04-25 | 2021-08-03 | 国网河南省电力公司平顶山供电公司 | Method for pre-judging heating defect of diversion loop of reactive power compensation device |
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| CN113203917A (en) * | 2021-04-25 | 2021-08-03 | 国网河南省电力公司平顶山供电公司 | Method for pre-judging heating defect of diversion loop of reactive power compensation device |
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