CN108363031A - A kind of secondary winding in current transformer no-load voltage ratio and polar on-line monitoring method - Google Patents
A kind of secondary winding in current transformer no-load voltage ratio and polar on-line monitoring method Download PDFInfo
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- CN108363031A CN108363031A CN201810179812.5A CN201810179812A CN108363031A CN 108363031 A CN108363031 A CN 108363031A CN 201810179812 A CN201810179812 A CN 201810179812A CN 108363031 A CN108363031 A CN 108363031A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The present invention relates to a kind of secondary winding in current transformer no-load voltage ratio and polar on-line monitoring methods, belong to Relay Protection Technology in Power System field.Utilize the analog quantity of current transformer protective winding and observing and controlling winding that protection information system acquisition arrives; judge current transformer protection, observing and controlling winding secondary circuit polarity, the correctness of no-load voltage ratio with calculating, differentiation and the calculating of power of difference stream, method of discrimination, realizes secondary winding in current transformer no-load voltage ratio, polar on-line monitoring.The present invention detects that current transformer flows into the polarity and no-load voltage ratio mistake of the secondary circuit of protective device and measure and control device, can avoid protective device incorrect operation or measure and control device data incorrect in time automatically in the case where not changing existing hardware equipment.
Description
Technical field
The invention belongs to field of power, be related to secondary winding in current transformer polarity and no-load voltage ratio in electric system
Line monitors, and is particularly suitable for having the substation for protecting letter system, power plant at present.
Background technology
Currently, if operation power transformation has secondary loop of mutual inductor polarity, no-load voltage ratio wrong, protection is often waited
It is just found after error action of device or tripping, on-line monitoring is lacked to secondary loop of mutual inductor, affects protective device
Correct action and measure and control device data are accurate.
Secondary winding in current transformer polarity proposed by the present invention and no-load voltage ratio on-line monitoring method, can be in existing hardware item
Secondary loop of mutual inductor problem is found before causing the accident on the basis of part, is conducive to the safety and stability fortune of power grid
Row.
Invention content
The purpose of the present invention is to provide a kind of secondary winding in current transformer no-load voltage ratio, polar on-line monitoring method, solutions
The problem of certainly lacking this respect on-line monitoring at present.
A kind of secondary winding in current transformer no-load voltage ratio and polar on-line monitoring method, are as follows：
1) it establishes guarantor's letter and is deployed in Ith area of safety with EMS integral systems, acquire synchronization busbar protective device difference stream,
The electric current, voltage and phase of circuit (main transformer, capacitor etc.) protective device and the electric current and power of measure and control device.It is female with A phases
Line voltage is reference voltage, measures winding, bus protection winding and circuit (main transformer, capacitor etc.) protective winding respectively
Secondary loop of mutual inductor correctness calculates analysis.
2) measure and control device winding secondary circuit on-line monitoring is carried out, calculation formula is：
In formula (1), I1i(a,b,c)For the primary current on busbar in the measure and control device at all disengaging intervals per phase, I1jTo wait for
It surveys and is spaced practical primary current, m is the primary current vector sum in the measure and control device at all disengaging intervals per phase on busbar.It is theoretical
Upper m is zero；When m is greater than or equal to 0.3 times of practical primary current I in interval to be measured1jWhen, judge the measurement winding current at interval to be measured
There are problems for transformer secondary circuit.
3) busbar protective device winding secondary circuit on-line monitoring is carried out, calculation formula is：
In formula (2), Id、Id1、Id2Big spill current, a female small spill current respectively in busbar protective device and two female small differences
Electric current.When busbar protective device normal operation, Id、Id1And Id2Very little goes to zero；Work as Id、Id1And Id2When more than 0.04A, judge
There are problems for the second loop return wiring of bus protection winding.
4) it is monitored on-line into row line (main transformer, capacitor etc.) protective winding secondary circuit, calculation formula is：
In formula (3), PbAnd PcThe active power and corresponding that respectively circuit (main transformer, capacitor etc.) protective device calculates
The active power of measure and control device acquisition, QbAnd QcRespectively circuit (main transformer, capacitor etc.) protective device calculate reactive power and
The reactive power of corresponding measure and control device acquisition.The secondary power that circuit (main transformer, capacitor etc.) protective device is calculated
It is compared with the secondary power inside corresponding measure and control device, when error is more than 5%, judges that protective winding secondary current returns
There are problems on road.Wherein, PbAnd QbIt is the electric current and voltage by transferring the acquisition of circuit (main transformer, capacitor etc.) protective device,
It is calculated with formula (4).
In formula (4), n=1,2 ... N, N are the data window length chosen；UaFor a phase voltage amounts, IaFor a phase current amounts, Ub
For b phase voltage amounts, IbFor b phase current amounts, UcFor c phase voltage amounts, IcFor c phase current amounts.
The characteristics of according to electric power secondary system, is divided into production control great Qu and management information great Qu.Production control great Qu
It is divided into control zone (Ith area of safety) and noncontrolled area (IIth area of safety).Production management area (IIIth area of safety) is divided into greatly in information management
With management information area (IVth area of safety).
Advantageous effect：The present invention can detect that current transformer flows into the secondary returning of protective device and measure and control device automatically
The polarity and no-load voltage ratio mistake on road can avoid protective device incorrect operation or the incorrect problem of measure and control device data in time.
Description of the drawings
Fig. 1 is the flow chart of the present invention.
Specific implementation mode
A kind of secondary winding in current transformer no-load voltage ratio and polar on-line monitoring method, steps are as follows：
(1) it establishes guarantor's letter and is deployed in Ith area of safety with EMS integral systems, acquire synchronization busbar protective device difference stream,
The electric current, voltage and phase of circuit (main transformer, capacitor etc.) protective device and the electric current and power of measure and control device.It is female with A phases
Line voltage is reference voltage, measures winding, bus protection winding and circuit (main transformer, capacitor etc.) protective winding respectively
Secondary loop of mutual inductor correctness calculates analysis.
(2) measure and control device winding secondary circuit on-line monitoring is carried out, calculation formula is：
In formula (1), I1i(a,b,c)For the primary current on busbar in the measure and control device at all disengaging intervals per phase, I1jTo wait for
It surveys and is spaced practical primary current, m is the primary current vector sum in the measure and control device at all disengaging intervals per phase on busbar.It is theoretical
Upper m is zero；When m is greater than or equal to 0.3 times of practical primary current I in interval to be measured1jWhen, judge the measurement winding current at interval to be measured
There are problems for transformer secondary circuit.
(3) busbar protective device winding secondary circuit on-line monitoring is carried out, calculation formula is：
In formula (2), Id、Id1、Id2Big spill current, a female small spill current respectively in busbar protective device and two female small differences
Electric current.When busbar protective device normal operation, Id、Id1And Id2Very little goes to zero；Work as Id、Id1And Id2When more than 0.04A, judge
There are problems for the second loop return wiring of bus protection winding.
(4) it is monitored on-line into row line (main transformer, capacitor etc.) protective winding secondary circuit, calculation formula is：
In formula (3), PbAnd PcThe active power and corresponding that respectively circuit (main transformer, capacitor etc.) protective device calculates
The active power of measure and control device acquisition, QbAnd QcRespectively circuit (main transformer, capacitor etc.) protective device calculate reactive power and
The reactive power of corresponding measure and control device acquisition.The secondary power that circuit (main transformer, capacitor etc.) protective device is calculated
It is compared with the secondary power inside corresponding measure and control device, when error is more than 5%, judges that protective winding secondary current returns
There are problems on road.Wherein, PbAnd QbIt is the electric current and voltage by transferring the acquisition of circuit (main transformer, capacitor etc.) protective device
Amount, is calculated with formula (4).
In formula (4), n=1,2 ... N, N are the data window length chosen；UaFor a phase voltage amounts, IaFor a phase current amounts, Ub
For b phase voltage amounts, IbFor b phase current amounts, UcFor c phase voltage amounts, IcFor c phase current amounts.
Embodiment 1：
Monitor a 110kV working line of certain 220kV substation, interval protection and measurement on-line with guarantor's letter system
CT no-load voltage ratios are 500/1, load a 125.25A, P=23.11MW, Q=10.28Mvar.Interval busbar differential current computing is sentenced
The results are shown in Table 1：
Table 1
Differentiated by difference stream, judges the electric current two of spacing current mutual inductor access measure and control device and busbar protective device
Minor loop polarity, no-load voltage ratio are correct, next with the data of guarantor's letter system acquisition to 110kV line protective devices and measure and control device
It is calculated, the results are shown in Table 2：
Table 2
Embodiment 2：
Monitor a 220kV working line of certain 220kV substation, interval protection and measurement on-line with guarantor's letter system
CT no-load voltage ratios are 1500/5, load a 85A, P=30.19MW, Q=3.97Mvar.Knot is differentiated to interval busbar differential current computing
Fruit is as shown in table 1：
Table 1
Differentiated by difference stream, judges the electric current two of spacing current mutual inductor access measure and control device and busbar protective device
Minor loop polarity, no-load voltage ratio are correct, next with the data of guarantor's letter system acquisition to 220kV line protective devices and measure and control device
It is calculated, the results are shown in Table 2：
Table 2
Power is acquired with measure and control device to be compared, calculate knot by the secondary power of the data calculating with protective device
For fruit in the error range of permission, CT line attachment protective device secondary circuit polarity no-load voltage ratios are correct.
Claims (2)
1. a kind of secondary winding in current transformer no-load voltage ratio and polar on-line monitoring method, it is characterised in that：Utilize protection information
The analog quantity for the current transformer protective winding and observing and controlling winding that system acquisition arrives, with the calculating of difference stream, differentiation and power
It calculates, method of discrimination judges current transformer protection, observing and controlling winding secondary circuit polarity, the correctness of no-load voltage ratio, realization electric current
Mutual inductor secondary winding no-load voltage ratio, polar on-line monitoring；
It the described method comprises the following steps：
Step 1：It establishes guarantor's letter and is deployed in Ith area of safety with EMS integral systems, acquire synchronization busbar protective device difference stream,
Electric current, voltage and the phase of line protective devices and the electric current and power of measure and control device；It is with reference to electricity with A phase busbar voltages
Pressure, the secondary loop of mutual inductor correctness for measuring winding, bus protection winding and route protection winding respectively calculate
Analysis；
Step 2：Measure and control device winding secondary circuit on-line monitoring is carried out, calculation formula is：
In formula (1), I1i(a,b,c)For the primary current on busbar in the measure and control device at all disengaging intervals per phase, I1jIt is to be measured
Every practical primary current, m is the primary current vector sum in the measure and control device at all disengaging intervals per phase on busbar, theoretically m
It is zero；When m is greater than or equal to 0.3 times of practical primary current I in interval to be measured1jWhen, judge that the measurement winding current at interval to be measured is mutual
There are problems for sensor secondary circuit；
Step 3：Busbar protective device winding secondary circuit on-line monitoring is carried out, calculation formula is：
In formula (2), Id、Id1、Id2Big spill current, a female small spill current respectively in busbar protective device and two female small difference electricity
Stream；When busbar protective device normal operation, Id、Id1And Id2Very little goes to zero；Work as Id、Id1And Id2When more than 0.04A, mother is judged
There are problems for the second loop return wiring of line protective winding；
Step 4：Route protection winding secondary circuit on-line monitoring is carried out, calculation formula is：
In formula (3), PbAnd PcThe wattful power of active power and the acquisition of corresponding measure and control device that respectively line protective devices calculate
Rate, QbAnd QcThe reactive power of reactive power and the acquisition of corresponding measure and control device that respectively line protective devices calculate；By circuit
The secondary power that protective device is calculated is compared with the secondary power inside corresponding measure and control device, when error is more than
When 5%, judge that there are problems in protective winding secondary current circuit.
2. secondary winding in current transformer no-load voltage ratio according to claim 1 and polar on-line monitoring method, feature exist
In：In step 4, PbAnd QbIt is the electric current and voltage by transferring line protective devices acquisition, then is calculated with formula (4)
Go out：
In formula (4), n=1,2 ... N, N are the data window length chosen；UaFor a phase voltage amounts, IaFor a phase current amounts, UbFor b phases
Voltage, IbFor b phase current amounts, UcFor c phase voltage amounts, IcFor c phase current amounts.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810179812.5A CN108363031B (en) | 2018-03-05 | 2018-03-05 | Online monitoring method for transformation ratio and polarity of secondary winding of current transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810179812.5A CN108363031B (en) | 2018-03-05 | 2018-03-05 | Online monitoring method for transformation ratio and polarity of secondary winding of current transformer |
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| CN108363031A true CN108363031A (en) | 2018-08-03 |
| CN108363031B CN108363031B (en) | 2020-02-04 |
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| CN201810179812.5A Active CN108363031B (en) | 2018-03-05 | 2018-03-05 | Online monitoring method for transformation ratio and polarity of secondary winding of current transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109375047A (en) * | 2018-09-25 | 2019-02-22 | 深圳供电局有限公司 | A kind of asynchronous polarity test system and method for ultra-high-tension power transmission line both-end |
| CN113253185A (en) * | 2021-06-03 | 2021-08-13 | 武汉磐电科技股份有限公司 | Current transformer calibration method, device, equipment and storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837795A (en) * | 2014-02-18 | 2014-06-04 | 国网山东省电力公司 | Dispatching end grid fault diagnosis method based on wide-area fault recording information |
| CN203811698U (en) * | 2014-03-18 | 2014-09-03 | 湖南省醴陵市湘瑞电力电器有限公司 | Polarity detection device for instrument transformer |
| CN106226612A (en) * | 2016-07-04 | 2016-12-14 | 国家电网公司 | Secondary wiring of current mutual inductor method for diagnosing faults based on pincerlike phase meter |
| CN206638801U (en) * | 2017-03-30 | 2017-11-14 | 保定市源创电力设备制造有限公司 | A kind of current transformer ratio polarity tester |
-
2018
- 2018-03-05 CN CN201810179812.5A patent/CN108363031B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837795A (en) * | 2014-02-18 | 2014-06-04 | 国网山东省电力公司 | Dispatching end grid fault diagnosis method based on wide-area fault recording information |
| CN203811698U (en) * | 2014-03-18 | 2014-09-03 | 湖南省醴陵市湘瑞电力电器有限公司 | Polarity detection device for instrument transformer |
| CN106226612A (en) * | 2016-07-04 | 2016-12-14 | 国家电网公司 | Secondary wiring of current mutual inductor method for diagnosing faults based on pincerlike phase meter |
| CN206638801U (en) * | 2017-03-30 | 2017-11-14 | 保定市源创电力设备制造有限公司 | A kind of current transformer ratio polarity tester |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109375047A (en) * | 2018-09-25 | 2019-02-22 | 深圳供电局有限公司 | A kind of asynchronous polarity test system and method for ultra-high-tension power transmission line both-end |
| CN109375047B (en) * | 2018-09-25 | 2020-10-16 | 深圳供电局有限公司 | System and method for testing double-end asynchronous polarity of high-voltage transmission line |
| CN113253185A (en) * | 2021-06-03 | 2021-08-13 | 武汉磐电科技股份有限公司 | Current transformer calibration method, device, equipment and storage medium |
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| CN108363031B (en) | 2020-02-04 |
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