CN107884645A - Based on voltage ratio compared with power capacitor method for monitoring operation states - Google Patents
Based on voltage ratio compared with power capacitor method for monitoring operation states Download PDFInfo
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- CN107884645A CN107884645A CN201711068102.7A CN201711068102A CN107884645A CN 107884645 A CN107884645 A CN 107884645A CN 201711068102 A CN201711068102 A CN 201711068102A CN 107884645 A CN107884645 A CN 107884645A
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- Prior art keywords
- power capacitor
- voltage
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- capacitor
- complexes
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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
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention relates to Power System Faults Detection technical field, and in particular to it is a kind of based on voltage ratio compared with power capacitor method for monitoring operation states, comprise the following steps：1), measurement apparatus obtains bus voltage value U from the voltage transformer TV of substation bus bar where power capacitor C complexes secondary circuit first；2) the theoretical value U'c, U'c=U/ (1 β) of power capacitor C working voltages, is calculated；3), power capacitor C actual motion magnitudes of voltage Uc is obtained from the secondary side for the voltage transformer TV for being connected in parallel to power capacitor C both ends；4), the com-parison and analysis power capacitor C working voltage theoretical value U'c and power capacitor C actual motion voltages Uc measured；The present invention is that the voltage parameter measurement under actual operating mode and analysis are calculated, its running status can truly be reflected, three-phase while on-line checking, measurement results reliability is higher, and can find to have a power failure and test the defects of measurement can not be found under low-voltage, low current.
Description
Technical field
The present invention relates to Power System Faults Detection technical field, and in particular to it is a kind of based on voltage ratio compared with electric capacitor
Device method for monitoring operation states.
Background technology
To improve grid equipment utilization ratio, the power factor of electricity supply and use equipment is improved, reduces power transmission and transformation and electricity consumption link
Electric energy loss, it is necessary to compensate the reactive power of resistance sense load consumption in power system, therefore, power system transformer substation is built-in
If a large amount of power capacitor complexes, he is that power system application is most traditional, most extensively and the most reactive-load compensation of quantity
Equipment, the reactive-load compensation equipment in China's power system are mostly parallel capacitor complete equipment, and it pacifies to power system
Full stable operation, improve the quality of power supply, reduce the transmission capacity etc. of electric energy loss, increase transmission line and power transformer
Good effect is played, the availability of capacitance reactive compensation equipment has become an important technology of power production management
Index.
Power capacitor complexes include switchgear, power capacitor, reactor, current transformer, mutual induction of voltage
Device, arrester, discharge coil, disconnecting switch, grounding switch etc..Reactive compensation complete device independent cloth in transformer station at present
Installation is put, is typically connected in parallel on transformer station's load bus, according to the voltage power-less on the power factor of power transformer or bus
Demand determines whether to put into.User's power failure is not directly contributed because whether it puts into, does not directly affect power supply reliability, it is general at present
Store-through is to power capacitor complexes, whether safe and reliable operation attention degree is inadequate the problem of.Especially pacify in design
There is many administrative vulnerabilities in dress, operation monitoring, defect elimination maintenance etc., operation actually shows：Due to product itself and O＆M matter
The reason such as amount problem and system overvoltage, harmonic current, operating ambient temperature height, power capacitor damage accident take place frequently, electric power
Capacitor installation accident rate is in first of transformer station's all devices, and many power capacitor complexes perform practically no function, by
In a variety of causes even can not put into operation throughout the year, make its effect fail be effectively played, had a strong impact on electrical network economy fortune
Row and quality of voltage.
Power capacitor is the electrical equipment using dielectric as working media, is worked under rated voltage, and it is situated between
The electrical strength of matter is still very high, and operates in full load state substantially, square directly proportional due to its load factor and its voltage,
Therefore the detection and control of actual motion voltage are most important.The power capacitor of power capacitor complexes is often by more
Power capacitor or Series Parallel Elements are formed, and Individual elements can change power capacitor because making moist, overvoltage, high temperature failure
The voltage's distribiuting of each unit component, the change of capacitance is caused, the reactive power for causing to send increases or decreases.Or capacitor bank
Scarce platform operation, the improper fusing of single capacitor fuse can also cause the apparent capacity amount of capacitor bank to change, and make reactive-load compensation
The reactive power of device output changes.Above reason all raises the temperature in its housing, accelerates insulating thermal aging, even
The excessive safe operation for causing power capacitor explosion accident, influenceing power capacitor of gas production.Electric capacitor is monitored and controlled
The actual motion voltage of device, the operation load factor of power capacitor can be limited, operating temperature rise is controlled, especially by electricity
Power capacitor working voltage theoretical value and it is actually detected to working voltage compare, power capacitor complexes can be diagnosed
Actual motion state.
At present, the common detection methods one of power capacitor state are to need to have a power failure to carry out routine test, are examined with capacitance meter
The capacitance of power capacitor is surveyed, pole insulation against ground resistance is measured with megameter, or measure the impedance in reactor loop etc.,
Second, conventional power capacitor status monitoring control method is to run electricity by substation bus bar voltage measuring transformer at present
Press and by the current transformer measuring loop electric current in power capacitor switch cabinet, and be equipped with overcurrent protection, overvoltage guarantor
Shield, unbalance voltage (electric current) protection, overload protection etc. are realized.
The content of the invention
In order to solve the above-mentioned technical problem the deficiency in, it is an object of the invention to：There is provided it is a kind of based on voltage ratio compared with
Power capacitor method for monitoring operation states, power capacitor working voltage theoretical value and the actually detected operation arrived can be passed through
Magnitude of voltage compares, with diagnosis power capacitor complexes actual motion state.
The present invention is that technical scheme is used by solving its technical problem：
It is described based on voltage ratio compared with power capacitor method for monitoring operation states, comprise the following steps：
1), measurement apparatus first where the power capacitor C complexes voltage transformer TV of substation bus bar two
Bus voltage value U is obtained on minor loop；
2), by ALU, theoretical value U'c, the U'c=U/ (1- of power capacitor C working voltages is calculated
β), wherein, β is the nominal reactance rate under power capacitor C complexes power frequencies；
3), the actual fortune of power capacitor C is obtained from the secondary side for the voltage transformer TV for being connected in parallel to power capacitor C both ends
Row magnitude of voltage Uc；
4), by the ALU of measurement apparatus, com-parison and analysis power capacitor C working voltage theoretical value U'c and survey
The power capacitor C actual motion voltage Uc obtained, and judge power capacitor C running status；If U'c ≈ Uc, electric capacitor
The state of device C complexes is normal；If U'c>Internal power capacitor C parallel elements be present in Uc, power capacitor C complexes
There is line-broken malfunction in open fault, or current-limiting reactor L, be abnormality；If U'c<Uc, exist and gone here and there inside power capacitor C
Join component breakdown phenomenon, or current-limiting reactor L shorted-turn faults, be abnormality；
If 5), power capacitor C running status is normal, power capacitor C is kept to continue to run with, abnormality is sent
Prompting or alarm signal, or send trip command to the circuit breaker Q F of outlet switch cabinet.
Further preferably, measurement apparatus includes voltage signal acquisition unit, ALU, signal processing unit, pre-
Alert indicator lamp and jingle bell.
Further preferably, measurement apparatus is connected, it is accused by the communication interface of standard with comprehensive automation system of transformer substation
Alert definite value or trip operation value can be adjusted voluntarily.
Compared with prior art, the invention has the advantages that：
The present invention is that the voltage parameter measurement under actual operating mode and analysis are calculated, and can truly reflect that it runs shape
State, three-phase while on-line checking, measurement results reliability is higher, and can find to have a power failure to test and be surveyed under low-voltage, low current
The defects of amount can not be found, and alarm signal, or the breaker into its switch cubicle are sent according to the defect order of severity immediately
Trip command is sent, stops the operation of power capacitor complexes, prevents accident.The fault type that can be differentiated is main
Have：(1) whether the harmonic current in power capacitor loop is exceeded；Reactance Rate under harmonic wave state can increase so that actual to survey
The capacitor working voltage rise of amount；(2) single power capacitor plays insurance；It is overall if power capacitor in parallel plays insurance
Capacitance reduces, and reactance Rate is relative to be increased, the power capacitor working voltage rise actually measured；If the capacitor of series loop
Insurance, the capacitance increase of whole show are played, the actual working voltage for measuring capacitor reduces；(3) single power capacitor string
Shunt-connected capacitive element punctures；If the power condenser element of its shunt circuit plays insurance, whole show capacitance reduces, reactance Rate
Increase, the capacitor working voltage rise actually measured；If the power condenser element of its series loop beats insurance, whole show
Capacitance increase, the power capacitor working voltage that actually measures reduces；(4) current-limiting reactor winding is short with the presence or absence of turn-to-turn
Road；The impedance of reactor now reduces, and loop reactances rate will also diminish, and the power capacitor working voltage actually measured subtracts
It is low；(5) current-limiting reactor winding whether there is stranded phenomenon；The impedance increase of reactor now, loop reactances rate will also increase
Greatly, the capacitor working voltage rise actually measured；(6) the defects of whether insulation makes moist and hidden danger；Power capacitor now
Capacitance or the inductive impedance of reactor can also change, cause reactance Rate to change, the capacitor operation electricity actually measured
Pressure will also change.
Brief description of the drawings
Fig. 1 FB(flow block)s of the present invention；
The electrical principle wiring diagram of Fig. 2 present invention.
Embodiment
The embodiment of the present invention is described further below in conjunction with the accompanying drawings：
Embodiment 1
As shown in Figure 1-2, it is of the present invention based on voltage ratio compared with power capacitor method for monitoring operation states, including with
Lower step：
1), measurement apparatus is pre-processed after starting, and carries out self-test first, and self-test mistake provides plant failure signal, from
After inspection is normal, obtained first from the voltage transformer TV of substation bus bar where power capacitor C complexes secondary circuit
Take bus voltage value U；
2), by ALU, theoretical value U'c, the U'c=U/ (1- of power capacitor C working voltages is calculated
β), wherein, β is the nominal reactance rate under power capacitor C complexes power frequencies；
3), the actual fortune of power capacitor C is obtained from the secondary side for the voltage transformer TV for being connected in parallel to power capacitor C both ends
Row magnitude of voltage Uc；
4), by the ALU of measurement apparatus, com-parison and analysis power capacitor C working voltage theoretical value U'c and survey
The power capacitor C actual motion voltage Uc obtained, and judge power capacitor C running status；If U'c ≈ Uc, electric capacitor
The state of device C complexes is normal；If U'c>Internal power capacitor C parallel elements be present in Uc, power capacitor C complexes
There is line-broken malfunction in open fault, or current-limiting reactor L, be abnormality；If U'c<Uc, exist and gone here and there inside power capacitor C
Join component breakdown phenomenon, or current-limiting reactor L shorted-turn faults, be abnormality；
If 5), power capacitor C running status is normal, power capacitor C is kept to continue to run with, abnormality is sent
Prompting or alarm signal, or send trip command to the circuit breaker Q F of outlet switch cabinet.
6) power capacitor C monitoring running state steps, are completed, return to original state.
Wherein, measurement apparatus includes voltage signal acquisition unit, ALU, signal processing unit, early warning instruction
Lamp and jingle bell；Measurement apparatus is connected, it alerts definite value or jump by the communication interface of standard with comprehensive automation system of transformer substation
Lock working value can be adjusted voluntarily.
As shown in Fig. 2 disconnecting switch QS, circuit breaker Q F, current transformer TA, current-limiting reactor L, power capacitor C with
And grounding switch QG2 is sequentially connected in series, voltage transformer TV is attempted by power capacitor C both ends, is obtained by its secondary side
Voltage Uc is power capacitor C actual motion voltage.
Claims (3)
1. it is a kind of based on voltage ratio compared with power capacitor method for monitoring operation states, it is characterised in that comprise the following steps：
1), measurement apparatus voltage transformer TV of substation bus bar first where power capacitor C complexes secondary returning
Bus voltage value U is obtained on road；
2), by ALU, the theoretical value U'c, U'c=U/ (1- β) of power capacitor C working voltages is calculated,
Wherein, β is the nominal reactance rate under power capacitor C complexes power frequencies；
3), power capacitor C actual motions electricity is obtained from the secondary side for the voltage transformer TV for being connected in parallel to power capacitor C both ends
Pressure value Uc；
4), by the ALU of measurement apparatus, com-parison and analysis power capacitor C working voltage theoretical value U'c and measure
Power capacitor C actual motion voltage Uc, and judge power capacitor C running status；If U'c ≈ Uc, power capacitor C into
The state of covering device is normal；If U'c>Internal power capacitor C parallel elements open circuit be present in Uc, power capacitor C complexes
There is line-broken malfunction in failure, or current-limiting reactor L, be abnormality；If U'c<Uc, power capacitor C internal series-connections member be present
Part punch-through, or current-limiting reactor L shorted-turn faults, it is abnormality；
If 5), power capacitor C running status is normal, power capacitor C is kept to continue to run with, abnormality sends prompting
Or alarm signal, or send trip command to the circuit breaker Q F of outlet switch cabinet.
2. it is according to claim 1 based on voltage ratio compared with power capacitor method for monitoring operation states, it is characterised in that
Measurement apparatus includes voltage signal acquisition unit, ALU, signal processing unit, early warning indicator lamp and jingle bell.
3. it is according to claim 1 based on voltage ratio compared with power capacitor method for monitoring operation states, it is characterised in that
Measurement apparatus is connected, it alerts definite value or trip operation value by the communication interface of standard with comprehensive automation system of transformer substation
Can voluntarily it adjust.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711068102.7A CN107884645A (en) | 2017-11-03 | 2017-11-03 | Based on voltage ratio compared with power capacitor method for monitoring operation states |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711068102.7A CN107884645A (en) | 2017-11-03 | 2017-11-03 | Based on voltage ratio compared with power capacitor method for monitoring operation states |
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| CN107884645A true CN107884645A (en) | 2018-04-06 |
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| CN201711068102.7A Pending CN107884645A (en) | 2017-11-03 | 2017-11-03 | Based on voltage ratio compared with power capacitor method for monitoring operation states |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN111426872A (en) * | 2020-04-22 | 2020-07-17 | 四川大学 | High-frequency high-voltage pulse lower short-circuit protection method for detecting multistage voltage dip |
| CN115343565A (en) * | 2022-10-19 | 2022-11-15 | 广东电网有限责任公司佛山供电局 | Method and device for evaluating health state of parallel capacitor in real time |
| CN115372816A (en) * | 2022-10-25 | 2022-11-22 | 华能辛店发电有限公司 | Power distribution switchgear operation fault prediction system and method based on data analysis |
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| CN107037279A (en) * | 2016-10-31 | 2017-08-11 | 华北电力大学 | A kind of shunt capacitor monitoring system and its method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
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| CN111426872A (en) * | 2020-04-22 | 2020-07-17 | 四川大学 | High-frequency high-voltage pulse lower short-circuit protection method for detecting multistage voltage dip |
| CN111426872B (en) * | 2020-04-22 | 2020-10-23 | 四川大学 | High-frequency high-voltage pulse lower short-circuit protection method for detecting multistage voltage dip |
| CN115343565A (en) * | 2022-10-19 | 2022-11-15 | 广东电网有限责任公司佛山供电局 | Method and device for evaluating health state of parallel capacitor in real time |
| CN115372816A (en) * | 2022-10-25 | 2022-11-22 | 华能辛店发电有限公司 | Power distribution switchgear operation fault prediction system and method based on data analysis |
| CN115372816B (en) * | 2022-10-25 | 2023-01-24 | 华能辛店发电有限公司 | Power distribution switchgear operation fault prediction system and method based on data analysis |
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Application publication date: 20180406 |
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