CN103645415A - Practical method of inspecting electric energy metering device wiring in charged mode - Google Patents
Practical method of inspecting electric energy metering device wiring in charged mode Download PDFInfo
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- CN103645415A CN103645415A CN201310666355.XA CN201310666355A CN103645415A CN 103645415 A CN103645415 A CN 103645415A CN 201310666355 A CN201310666355 A CN 201310666355A CN 103645415 A CN103645415 A CN 103645415A
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Abstract
A practical method of inspecting electric energy metering device wiring in a charged mode belongs to the electrical technology field. A technical scheme of the invention is characterized in that 1, through inspecting a voltage transformer open circuit fault and voltage transformer winding polarity reversal, whether voltage transformer wiring is correct is inspected in the charged mode; 2, through checking a current transformer nameplate transformation ratio, a short circuit and open circuit inspection of a current transformer and a secondary grounding inspection, whether current transformer wiring is correct is inspected in the charged mode; 3, an overall wiring inspection is performed on a charged state of an electric energy metering device, and whether the wiring is correct or not is determined and whether a user has an electricity stealing behavior is determined. The method has the advantages that by using the method, a common electrotechnical instrument can be used to inspect the electric energy metering device wiring in the charged mode and can be used to determine that which kind of error wiring the current wiring belongs to; a basis is provided for correcting the wiring and calculating error power; the method is practical; operation is simple; an electricity larceny prevention effect is achieved and economic benefits are increased.
Description
Technical field
The practical approach of a kind of charged inspection electric power meter wiring belongs to technical field of electricity.
Background technology
Electric power meter is for electricity consumption both sides, to carry out the instrument of electric weight trade settlement, and Ye Shi power supply enterprise enhances internal management, carries out the requisite means of business accounting, so its accuracy, correctness are more and more subject to people's attention.Guarantee that electric energy metrical is accurate, reliable, must guarantee the correct of its wiring.In general, every installation, debugging, the conscientious construction in line with the drawings of acceptance phase, carefully check inspection, strict reception test measuring apparatus wiring correct often.
After electric power meter puts into operation, why will carry out charged inspection, be mainly to have judged whether reconfiguration or electricity filching behavior by inspection.What have at present is W/S method by actual loading relative method, and power and the real power in circuit of electric energy meter reflection are compared to judge, this method will be through calculating and could judging in conjunction with macroscopic examination whether user has electricity filching behavior.Also the use moment method having, observes disc rotation speed after the original wiring of electric energy meter is deliberately changed or the variation that turns to judges, this method only could use during without v phase current in confirming electric energy meter, and easily occur judging by accident.Owing to there is no unified band electrical inspection method, the charged inspection of each electric company's electric power meter or too loaded down with trivial details, or negligence of management.Therefore, the method for the charged inspection electric power meter of necessary standard wiring.
Summary of the invention
Object of the present invention be exactly adapt to current in the urgent need to, release the practical approach of a kind of charged inspection electric power meter wiring.
Technical scheme of the present invention is: the one, and by checking voltage transformer (VT) open fault and checking that voltage transformer (VT) winding polarity connects instead, come the wiring of charged inspection voltage transformer (VT) whether correct; The 2nd, whether by checking, short circuit, the open circuit of current transformer nameplate no-load voltage ratio, current transformer checks and secondary ground connection checks, come charged inspection current transformer connection correct; The 3rd, to electric power meter is charged, carry out whole wiring check, judgement wiring be to or wrong, determine whether user has electricity filching behavior.
The invention has the beneficial effects as follows: the method is used the just charged inspection electric power meter of the energy wiring of conventional electrical instrument, judgement belongs to any false wiring, thereby provide foundation for correcting wiring and calculating mistake electric weight, method is practical, easy and simple to handle, reach power-steeling preventing effect, increase economic efficiency.
Embodiment
Whether the present invention one is by checking voltage transformer (VT) open fault and check that voltage transformer (VT) winding polarity connects instead, coming the wiring of charged inspection voltage transformer (VT) correct; The 2nd, whether by checking, short circuit, the open circuit of current transformer nameplate no-load voltage ratio, current transformer checks and secondary ground connection checks, come charged inspection current transformer connection correct; The 3rd, to electric power meter is charged, carry out whole wiring check, judgement wiring be to or wrong, determine whether user has electricity filching behavior.
Details and the course of work of the practical approach of a kind of charged inspection electric power meter wiring are described below in conjunction with my company's practice in the past few years:
One, charged inspection voltage transformer (VT) wiring
Object is to check and first and second side of getting rid of voltage transformer (VT) (hereinafter to be referred as TV) has or not broken string or reverse polarity connection situation.Strictly observe site safety working system, pay special attention to prevent because checking that wiring causes the fault of TV secondary loop short circuit or TV secondary circuit open circuit.
1, check voltage transformer (VT) open fault
Being looked into mutual inductor is the three-phase TV of Vv12 wiring or the three-phase TV of Yyn12 wiring, checks that step is: open measuring apparatus terminal box, with the 200V range of phase voltammetric meter or the common voltage table of a 250V, measure successively three secondary side line voltage V
1, V
2, V
3.For the three-phase TV of Vv12 wiring, if V
1, V
2, V
3differ larger, as voltage is zero or is significantly less than 100V, inner certain existence of mutual inductor broken or loose contact fault.For the three-phase TV of Yyn12 wiring, if V
1, V
2, V
3there is the voltage that approaches 57.7V, inner certain once broken string or the loose contact fault of existing of mutual inductor; If V
1, V
2, V
3have the voltage that is starkly lower than 100V as 0V, 50V etc., necessarily there is secondary break or loose contact fault in mutual inductor inside.
2, check that voltage transformer (VT) winding polarity connects instead
Being looked into mutual inductor is the three-phase TV of Vv12 wiring or the three-phase TV of Yyn12 wiring, checks that step is: open measuring apparatus terminal box, with the 200V range of phase voltammetric meter or the common voltage table of a 250V, measure successively three secondary side line voltage V
1, V
2, V
3.For the three-phase TV of Vv12 wiring, if V
1, V
2, V
3have the voltage that approaches 173V, mutual inductor has reverse polarity connection fault.For the three-phase TV of Yyn12 wiring, if V
1, V
2, V
3have the voltage that approaches 57.7V, there is reverse polarity connection fault in mutual inductor.
Two, charged inspection current transformer connection
When line fault occurs on current transformer (hereinafter to be referred as TA), may occur: 1. the TA number of turn makes actual no-load voltage ratio be greater than nameplate no-load voltage ratio; 2. retain former TA, change the nameplate less than actual no-load voltage ratio; 3. second open circuit; 4. once or second short circuit; 5. reverse polarity connection etc.Therefore carry out through the following steps to determine failure mode.
1, check current transformer nameplate no-load voltage ratio
When by line inspection road being Vv12 wiring four-wire system TA: the primary current I that surveys respectively U phase TA with the high and low range of two clamps on amperemeter simultaneously
1, secondary current I
2, and calculate no-load voltage ratio K
u=I
1/ I
2, draw equally the no-load voltage ratio K of W phase
w, due to this circuit almost symmetry, therefore should have K
u≈ K
w≈ K
1, otherwise there is the suspicion of change TA umber of turn or replacing nameplate in this user.When by line inspection road being Yyn12 wiring six line TA processed: the primary current I that surveys respectively U phase TA with the high and low range of two clamps on amperemeter simultaneously
1, secondary current I
2, and calculate no-load voltage ratio K
u=I
1/ I
2, draw equally the no-load voltage ratio K of V phase
v, W phase no-load voltage ratio K
w, due to this circuit almost symmetry, therefore should have K
u≈ K
w≈ K
v≈ K
1, otherwise there is the suspicion of change TA umber of turn or replacing nameplate in this user.
2, the short circuit of current transformer, open circuit check
Vv12 wiring four-wire system TA: survey respectively two electric currents of secondary with phase voltammetric meter 5A current range, all should be less than 5V, if certain phase current is zero and load current is non-vanishing, this phase TA exists winding may by three kinds of short circuits, TA secondary circuit open circuit by short circuit, Secondary Winding.Yyn12 wiring six line TA processed: survey respectively three electric currents of secondary with phase voltammetric meter 5A current range, all should be less than 5V, if certain phase current is zero and load current is non-vanishing, winding of this phase TA existence is by short circuit, Secondary Winding by short circuit, three kinds of possibilities of TA secondary circuit open circuit, and external shorting stub can help to confirm by direct-vision method.
3, the secondary ground connection of current transformer checks
TA requires one end ground connection bis-times.For finding out the ground wire in TA secondary circuit, with a short circuit wire (or reometer), determine: by shorting stub one end ground connection, the other end is connected with the current terminal of electric energy meter.For induction type electric energy meter, if the disc rotation speed of electric energy meter is unchanged, illustrate that this terminal is ground connection; If disc rotation speed is slack-off, illustrate that this terminal is earth-free.
For electronic electric energy meter, its flashlight flashes situation of change and induction type electric energy meter disk, and to rotate the corresponding relation of situation of change as shown in the table.
| Induction type electric energy meter disk rotates situation of change | Electronic electric energy meter flashlight flashes situation of change |
| It is slow that forward turns | Flash Frequency downshift |
| Do not turn | Do not dodge |
| Oppositely turn slow | Flash Frequency downshift, oppositely None-identified |
| It is indefinite to turn to | None-identified |
Three, electric power meter is carried out to charged whole wiring check
Due to the wiring of three-phase three-wire electric energy meter with judge all more complicated, therefore take this circuit to illustrate concrete grammar and the step of inspection as example:
1, with alternating voltage shelves or the voltage table of multimeter, measure electrical energy meter electricity pressure side button three-phase voltage.Under normal circumstances, phase voltage is to approach to equate, is about 100V.As each phase voltage recording differs larger, the situation of account for voltage loop existence broken string or reverse polarity connection.When distinguishing that TV exists the situation of broken string or reverse polarity connection, after making a record, correct in advance this type of mistake and do again other inspection.
2, check voltage earth point.First, by one end ground connection of voltage table, the other end touches electrical energy meter electricity pressure side button successively.If any two voltage terminal voltage-to-grounds, be 100V, remaining one end voltage-to-ground approaches 0V, and explanation is two single-phase TV, and wiring is that V/v shape connects, and voltage approaches 0V mutually for V phase, is Earth Phase.
3, survey three-phase voltage phase sequence.With phase-sequence meter, measure three-phase voltage phase sequence, then be V phase according to the Earth Phase of having distinguished, just can determine that all the other two-phases are affiliated separate.
4, check electric current wiring.With clamp on amperemeter test, at load lower each phase current in a basic balance, whether approach and equate, distinguish and have or not short circuit or open circuit conditions.
The method is used the just charged inspection electric power meter of the energy wiring of conventional electrical instrument, judgement belongs to any false wiring, thereby provides foundation for correcting wiring and calculating mistake electric weight, and method is practical, easy and simple to handle, reach power-steeling preventing effect, increase economic efficiency.
Claims (1)
1. a practical approach for charged inspection electric power meter wiring, is characterized in that: the one, and by checking voltage transformer (VT) open fault and checking that voltage transformer (VT) winding polarity connects instead, whether the wiring of charged inspection voltage transformer (VT) is correct; The 2nd, whether by checking, short circuit, the open circuit of current transformer nameplate no-load voltage ratio, current transformer checks and secondary ground connection checks, come charged inspection current transformer connection correct; The 3rd, to electric power meter is charged, carry out whole wiring check, judgement wiring be to or wrong, determine whether user has electricity filching behavior.
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|---|---|---|---|
| CN201310666355.XA CN103645415A (en) | 2013-12-11 | 2013-12-11 | Practical method of inspecting electric energy metering device wiring in charged mode |
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|---|---|---|---|
| CN201310666355.XA CN103645415A (en) | 2013-12-11 | 2013-12-11 | Practical method of inspecting electric energy metering device wiring in charged mode |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869210A (en) * | 2014-03-21 | 2014-06-18 | 国家电网公司 | Wiring right and wrong detector for electric energy metering device in power-off state |
| CN105182164A (en) * | 2015-09-23 | 2015-12-23 | 广东电网有限责任公司佛山供电局 | Electric energy metering secondary loop wiring verification method |
| CN107976648A (en) * | 2017-10-15 | 2018-05-01 | 四川罡正电子科技有限公司 | A kind of Electric control measuring instrument automatic connection test method |
| CN111965568A (en) * | 2020-08-24 | 2020-11-20 | 南方电网数字电网研究院有限公司 | Method and device for monitoring wiring state of mutual inductor |
| CN111983547A (en) * | 2020-08-26 | 2020-11-24 | 国网北京市电力公司 | Simple metering device abnormity searching method |
| CN112710883A (en) * | 2020-12-02 | 2021-04-27 | 国网辽宁省电力有限公司阜新供电公司 | Method for checking mutual inductor to steal electricity |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869210A (en) * | 2014-03-21 | 2014-06-18 | 国家电网公司 | Wiring right and wrong detector for electric energy metering device in power-off state |
| CN103869210B (en) * | 2014-03-21 | 2017-05-10 | 国家电网公司 | Wiring right and wrong detector for electric energy metering device in power-off state |
| CN105182164A (en) * | 2015-09-23 | 2015-12-23 | 广东电网有限责任公司佛山供电局 | Electric energy metering secondary loop wiring verification method |
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| CN107976648A (en) * | 2017-10-15 | 2018-05-01 | 四川罡正电子科技有限公司 | A kind of Electric control measuring instrument automatic connection test method |
| CN111965568A (en) * | 2020-08-24 | 2020-11-20 | 南方电网数字电网研究院有限公司 | Method and device for monitoring wiring state of mutual inductor |
| CN111983547A (en) * | 2020-08-26 | 2020-11-24 | 国网北京市电力公司 | Simple metering device abnormity searching method |
| CN112710883A (en) * | 2020-12-02 | 2021-04-27 | 国网辽宁省电力有限公司阜新供电公司 | Method for checking mutual inductor to steal electricity |
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Application publication date: 20140319 |