CN108051699A - A kind of secondary loop of mutual inductor of transformer substation exception live detection method and system - Google Patents
A kind of secondary loop of mutual inductor of transformer substation exception live detection method and system Download PDFInfo
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- CN108051699A CN108051699A CN201711143965.6A CN201711143965A CN108051699A CN 108051699 A CN108051699 A CN 108051699A CN 201711143965 A CN201711143965 A CN 201711143965A CN 108051699 A CN108051699 A CN 108051699A
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- 238000001514 detection method Methods 0.000 title claims abstract description 63
- 230000001264 neutralization Effects 0.000 claims abstract description 43
- 238000004804 winding Methods 0.000 claims description 15
- 230000002159 abnormal effect Effects 0.000 claims description 7
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- 239000004020 conductor Substances 0.000 abstract description 13
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000010835 comparative analysis Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000004590 computer program Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
Abstract
The invention discloses a kind of secondary loop of mutual inductor of transformer substation exception live detection method and system, method and step includes：In advance raw file is established for the mutual inductor of substation, for the mutual inductor of charging operation, the secondary voltage of secondary voltage circuit, the electric current neutral point current in secondary current circuit and earth current under detection record charging operation, and respectively compared with its standard value in raw file, if free voltage or electric current and its standard value numerical value in raw file is unequal and deviation is more than predetermined threshold value, secondary loop of mutual inductor of transformer substation exception is judged.The present invention can be directed to substation's mutual inductor and realize live detection, judge circuit integrity and correctness by live line measurement three-phase and four-line formula secondary voltage, the current loop neutral conductor and ground wire current values come comparative analysis, have the advantages that method is effective, detection is easy, the live detection available for operation mutual inductor three-phase and four-line formula secondary voltage, current loop analyzes and determines.
Description
Technical field
The present invention relates to substation's mutual inductor secondary voltage, current loop method for detecting abnormality, and in particular to one kind is based on
The method and system of the neutral conductor and ground wire current detecting secondary loop of mutual inductor of transformer substation exception in voltage, current loop.
Background technology
As one of most important circuit of substation, voltage, the correctness of electric current secondary loop are related to protective device energy
No correct action, can system load flow reflect strictly according to the facts, can electrical energy measurement accurately record, and importance is self-evident.To Mr. Yu
A little more hidden electric currents, voltage secondary circuit hidden danger, such as two points ground fault, wiring error, secondary installing, regular maintenance and
It is easily ignored in onload examination, it is often difficult to be exposed the onload examination after power transmission in normal course of operation and also can not
It was found that problems, however these hidden wiring errors can cause protection to miss under system jam or some extreme cases
Dynamic, tripping or even expansion accident scope, influence power system security stable operation.
In existing detection means, size and the phase of each phase current are mainly detected by device or instrument to judge exception,
But it is special, there is no the sizes to circuit ground wire current values to measure judgement, so as to be difficult with simplest inspection
It surveys to judge that circuit two points ground fault etc. is abnormal, this is the straightforward procedure omitted in existing detection means.
To find problems, removing a hidden danger, we utilize the neutral conductor in a kind of voltage, current loop and ground connection line current
The application process of detection, to running mutual inductor three-phase and four-line formula secondary voltage in substation, current loop carries out live detection point
Analysis, judges the exception in circuit, to ensure the correctness of voltage, electric current secondary loop in the live detection method of simple possible.
The content of the invention
The technical problem to be solved in the present invention：For the above problem of the prior art, a kind of substation's mutual inductor two is provided
Minor loop exception live detection method and system, the present invention can be directed to substation's mutual inductor and realize live detection, by charged
Measurement three-phase and four-line formula secondary voltage, the current loop neutral conductor and ground wire current values carry out comparative analysis and judge circuit integrity
And correctness, have the advantages that method is effective, detection is easy, available for operation mutual inductor three-phase and four-line formula secondary voltage, electric current
The live detection in circuit analyzes and determines.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
The present invention provides a kind of secondary loop of mutual inductor of transformer substation exception live detection method, and implementation steps include：
1）The mutual inductor for substation establishes the raw file of secondary circuit in advance, and the secondary circuit includes substation's mutual inductance
The secondary voltage circuit of three-phase and four-line formula form of device and secondary current circuit, the raw file of the secondary circuit are included mutually
Electric current neutral point current and earth current in the secondary voltage circuit of sensor and secondary current circuit are normally transported in mutual inductor
Standard value under row；When needing to carry out transformer secondary circuit exception live detection, redirect and perform step 2）；
2）For the mutual inductor of charging operation, under detection record charging operation in secondary voltage circuit and secondary current circuit
Electric current neutral point current and earth current；
3）To detect secondary voltage circuit under obtained charging operation and the electric current neutral point current in secondary current circuit and
Earth current respectively compared with its standard value in raw file, if free voltage or electric current with it in raw file
In standard value numerical value is unequal and deviation is more than predetermined threshold value, then judge secondary loop of mutual inductor of transformer substation exception.
Preferably, step 1）In when establishing the raw file of secondary circuit for the mutual inductor of substation, in raw file
The transformer parameter of whole station is further included, the transformer parameter includes circuit number, winding, purposes, a polarity, secondary pole
Property, no-load voltage ratio, and record secondary voltage circuit, the earth point in secondary current circuit in detail, be accurate to screen cabinet and terminal number.
The present invention also provides a kind of secondary loop of mutual inductor of transformer substation exception electrification detection system, including：
Raw file establishes program unit, and the mutual inductor for being directed to substation in advance establishes the raw file of secondary circuit, institute
Stating secondary circuit includes the secondary voltage circuit of three-phase and four-line formula form of substation's mutual inductor and secondary current circuit, described
The raw file of secondary circuit includes the electric current neutral point current in the secondary voltage circuit of mutual inductor and secondary current circuit
With standard value of the earth current under mutual inductor normal operation；When needing to carry out transformer secondary circuit exception live detection,
It redirects and performs voltage and current detecting program unit；
Voltage and current detecting program unit, for being directed to the mutual inductor of charging operation, detection records secondary electricity under charging operation
Push back the electric current neutral point current and earth current in road and secondary current circuit；
Secondary circuit exception determining program unit, for secondary voltage circuit and secondary electricity under obtained charging operation will to be detected
Electric current neutral point current in road and earth current are flowed back to respectively compared with its standard value in raw file, if appointed
Anticipating, voltage or electric current are unequal with its standard value numerical value in raw file and deviation is more than predetermined threshold value, then judge power transformation
Transformer secondary circuit of standing is abnormal.
Preferably, the raw file establishes transformer parameter of the program unit including whole station and establishes program module, described
The transformer parameter that transformer parameter establishes program module generation includes circuit number, winding, purposes, a polarity, secondary pole
Property, no-load voltage ratio, and record secondary voltage circuit, the earth point in secondary current circuit in detail, be accurate to screen cabinet and terminal number.
It is described including computer the present invention also provides a kind of secondary loop of mutual inductor of transformer substation exception electrification detection system
Computer is programmed to perform the step of foregoing secondary loop of mutual inductor of transformer substation exception live detection method of the invention.
Secondary loop of mutual inductor of transformer substation exception live detection method tool of the present invention has the advantage that：The present invention passes through advance
The raw file of secondary circuit is established for the mutual inductor of substation, for the mutual inductor of charging operation, detection records charged fortune
The secondary voltage of the lower secondary voltage circuit of row, the electric current neutral point current and earth current in secondary current circuit, detection is obtained
Charging operation under the secondary voltage circuit of secondary voltage circuit, the electric current neutral point current in secondary current circuit and earth current
Respectively compared with its standard value in raw file, if free voltage or electric current and its standard in raw file
Value numerical value is unequal and deviation is more than predetermined threshold value, then judges secondary loop of mutual inductor of transformer substation exception, and the present invention can be directed to
Substation's mutual inductor realizes live detection, passes through live line measurement three-phase and four-line formula secondary voltage, the current loop neutral conductor and ground connection
Line current numerical value carrys out comparative analysis and judges circuit integrity and correctness, has the advantages that method is effective, detection is easy, can be used for
Run mutual inductor three-phase and four-line formula secondary voltage, the live detection of current loop analyzes and determines.
Secondary loop of mutual inductor of transformer substation exception electrification detection system of the present invention is substation's mutual inductor secondary returning of the present invention
The corresponding system of road exception live detection method, therefore also there is secondary loop of mutual inductor of transformer substation exception live detection of the present invention
The aforementioned advantages of method, therefore details are not described herein.
Description of the drawings
Fig. 1 is the basic principle schematic of present invention method.
Fig. 2 is the typical simple schematic diagram of three-phase and four-line current loop.
Fig. 3 is the typical simple schematic diagram of three-phase and four-line voltage circuit.
Fig. 4 is certain 1 structure diagram of mutual inductor using the embodiment of the present invention.
Fig. 5 is the wiring faults structure diagram using certain mutual inductor 1 of the embodiment of the present invention.
Fig. 6 is to correct structure diagram using the wiring of certain mutual inductor 1 of the embodiment of the present invention.
Fig. 7 is certain 1 structure diagram of mutual inductor using the embodiment of the present invention.
Specific embodiment
As shown in Figure 1, the implementation steps of the present embodiment secondary loop of mutual inductor of transformer substation exception live detection method include：
1）The mutual inductor for substation establishes the raw file of secondary circuit in advance, and the secondary circuit includes substation's mutual inductance
The secondary voltage circuit of three-phase and four-line formula form of device and secondary current circuit, the raw file of the secondary circuit are included mutually
Electric current neutral point current and earth current in the secondary voltage circuit of sensor and secondary current circuit are normally transported in mutual inductor
Standard value under row；When needing to carry out transformer secondary circuit exception live detection, redirect and perform step 2）；
2）For the mutual inductor of charging operation, under detection record charging operation in secondary voltage circuit and secondary current circuit
Electric current neutral point current and earth current；
3）To detect secondary voltage circuit under obtained charging operation and the electric current neutral point current in secondary current circuit and
Earth current respectively compared with its standard value in raw file, if free voltage or electric current with it in raw file
In standard value numerical value is unequal and deviation is more than predetermined threshold value, then judge secondary loop of mutual inductor of transformer substation exception.
In the present embodiment, step 1）In when establishing the raw file of secondary circuit for the mutual inductor of substation, original shelves
Further include the transformer parameter of whole station in case, the transformer parameter includes circuit number, winding, purposes, a polarity, secondary
Polarity, no-load voltage ratio, and secondary voltage circuit, the earth point in secondary current circuit are recorded in detail, it is accurate to screen cabinet and terminal number.
The testing principle of the present embodiment secondary loop of mutual inductor of transformer substation exception live detection method is as follows：Referring to Fig. 2 institutes
The typical three-phase and four-line current loop shown, circuit under normal circumstances, the mutual inductor three-phase vector current I of operationA、IB、ICBalance,
Its vector sum is equal to 0 (A), there is neutral current IN=IA+IB+IC=0 (A), ground connection line current IGround=IA+IB+IC-IN=0 (A) considers
Electric current is there are certain deviation in practice, three-phase current vector and has deviation, neutral current INThere to be several milliamperes of deviation, connect
Ground line current will also have several milliamperes of deviation.When carrying out the operation transformer current circuit neutral conductor, ground wire electric current live detection
When, the I that is surveyedN、IGroundIf being not 0 (A), it is abnormal, it is necessary to be examined to circuit to illustrate that mutual inductor secondary current circuit exists
Reason is investigated and prosecuted, interruption maintenance is also needed to when necessary.Typical three-phase and four-line voltage circuit shown in Figure 3：Circuit normal condition
Under, the mutual inductor three-phase voltage U of operationA、UB、UCBalance, vector sum are equal to 0 (V), UNFor 0 (V), if UA、UB、UC、UNThree-phase
The electric current flowed through on voltage circuit is respectively Ia、Ib、Ic、In, there is neutral current In=Ia+Ib+Ic=0, ground connection line current I`Ground=Ia
+Ib+Ic-In=0, three-phase current vector and have deviation, neutral current I in practicenVariation milliampere, ground connection line current also will
There is several milliamperes of deviation.When carrying out the operation transformer current circuit neutral conductor, ground wire electric current live detection, the I that is surveyedn、I
`GroundIf being not 0, it is abnormal, it is necessary to inspection processing be carried out to circuit, when necessary to illustrate that mutual inductor secondary voltage circuit exists
Also need to interruption maintenance.
Hereafter by with the secondary current circuit of certain 600 current transformer of 220kV substations mother shown in Fig. 4 be grounded into
Exemplified by row live detection, the present embodiment secondary loop of mutual inductor of transformer substation exception live detection method is further described：
For certain 600 current transformer of 220kV substations mother shown in Fig. 4, detection is found in 600 breaker terminals case of mother
Second winding（To the female poor failure protection SGB750 of first set）Ground connection line current reach 297mA, and actual load electric current is
145mA.It further checks and finds second and the 6th winding（It is spare）The ground connection line current of two windings reaches 297mA, and
Phase differs 180 °.By conscientiously checking, analyzing and check comprehensively, the 6X at 600 C phase TA bodies of mother and 18A wiring are found
Intersect mistake, as shown in figure 5, second winding of C phases and the 6th winding is caused to be concatenated into a current loop, so that
There are two the 1P12 of earth point, respectively terminal box in the circuit（N421）And 1P33（N461）Place, as shown in fig. 6, and then second
A winding and the 6th winding earth line have flowed through second winding of C phases TA and the 6th winding and electric current, causes to be grounded
Current values reach 2 times of monophase current numerical value, and deviation is serious.It is handled and by having a power failure by after 5 correct wiring of attached drawing, measuring the
Two windings and the 6th winding earth line current are 0.7mA, eliminate potential thing caused by current circuit connections mistake together
Therefore hidden danger.
Exemplified by progress live detection hereafter will be grounded by the secondary current circuit of certain 500kV substation shown in Fig. 7, to this
Embodiment secondary loop of mutual inductor of transformer substation exception live detection method is further described：
Certain 500kV substations live detection shown in Fig. 7 finds that the female busbar TV neutral currents of 500kV I reach 138.06mA, ground connection
Line current reaches 137.83mA, and the female busbar TV neutral currents of 500kV II reach 149.55mA, ground connection line current reaches
146.74mA.By conscientiously checking, analyzing, the #2 main transformer high side voltages circuit neutral conductor in the protection of 5011 breakers is found
（N600/5011-332E）With the voltage neutral line from I busbar busbar TV of 500kV（N600/5011DL-B311）And connect,
The #2 main transformer high side voltages circuit neutral conductor in the protection of 5012 breakers（N600/5011-332E）With it is female from II busbares of 500kV
The voltage neutral line of line TV（N600/5012DL-B311）And connect, associated voltage circuit as shown in fig. 7, so as to cause 500kV I,
II mother busbar TV secondary voltages are grounded and the neutral conductor forms one with the #2 main transformer high side voltages circuit neutral conductor and completely returns
Road, as shown in heavy line in attached drawing 7.There are two earth points in account for voltage circuit to result in current voltage circuit neutral conductor electricity
The severe deviations of stream, ground connection line current.Line between 15D4,15D5 in 5011 breaker protection screens is removed realizes voltage
Voltage circuit is each only there are one earth point after circuit is unlinked, in detection voltage circuit neutral current, ground wire current values
It is about 2.7mA or so to find electric current afterwards, and electric current recovers normal, and voltage circuit recovers normal, so as to pass through the live detection neutral conductor
The false wiring together that electric current, ground connection line current find and eliminate causes the abnormal hidden danger of voltage circuit two points ground fault.
Computer program realization can be used in the present embodiment secondary loop of mutual inductor of transformer substation exception live detection method, uses
The secondary loop of mutual inductor of transformer substation exception electrification detection system that computer program is realized includes：
Raw file establishes program unit, and the mutual inductor for being directed to substation in advance establishes the raw file of secondary circuit, institute
Stating secondary circuit includes the secondary voltage circuit of three-phase and four-line formula form of substation's mutual inductor and secondary current circuit, described
The raw file of secondary circuit includes the electric current neutral point current in the secondary voltage circuit of mutual inductor and secondary current circuit
With standard value of the earth current under mutual inductor normal operation；When needing to carry out transformer secondary circuit exception live detection,
It redirects and performs voltage and current detecting program unit；
Voltage and current detecting program unit, for being directed to the mutual inductor of charging operation, detection records secondary electricity under charging operation
Push back the electric current neutral point current and earth current in road and secondary current circuit；
Secondary circuit exception determining program unit, for secondary voltage circuit and secondary electricity under obtained charging operation will to be detected
Electric current neutral point current in road and earth current are flowed back to respectively compared with its standard value in raw file, if appointed
Anticipating, voltage or electric current are unequal with its standard value numerical value in raw file and deviation is more than predetermined threshold value, then judge power transformation
Transformer secondary circuit of standing is abnormal.
In the present embodiment, the raw file establishes transformer parameter of the program unit including whole station and establishes program module,
The transformer parameter that the transformer parameter establishes program module generation includes circuit number, winding, purposes, polarity, two
Secondary polarity, no-load voltage ratio, and secondary voltage circuit, the earth point in secondary current circuit are recorded in detail, it is accurate to screen cabinet and terminal number.
In addition, the present embodiment also provides a kind of secondary loop of mutual inductor of transformer substation exception electrification detection system, including calculating
The step of machine, the computer is programmed to perform the present embodiment secondary loop of mutual inductor of transformer substation exception live detection method.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (5)
- A kind of 1. secondary loop of mutual inductor of transformer substation exception live detection method, it is characterised in that implementation steps include：1）The mutual inductor for substation establishes the raw file of secondary circuit in advance, and the secondary circuit includes substation's mutual inductance The secondary voltage circuit of three-phase and four-line formula form of device and secondary current circuit, the raw file of the secondary circuit are included mutually Electric current neutral point current and earth current in the secondary voltage circuit of sensor and secondary current circuit are normally transported in mutual inductor Standard value under row；When needing to carry out transformer secondary circuit exception live detection, redirect and perform step 2）；2）For the mutual inductor of charging operation, under detection record charging operation in secondary voltage circuit and secondary current circuit Electric current neutral point current and earth current；3）To detect secondary voltage circuit under obtained charging operation and the electric current neutral point current in secondary current circuit and Earth current respectively compared with its standard value in raw file, if free voltage or electric current with it in raw file In standard value numerical value is unequal and deviation is more than predetermined threshold value, then judge secondary loop of mutual inductor of transformer substation exception.
- 2. secondary loop of mutual inductor of transformer substation exception live detection method according to claim 1, which is characterized in that step 1）In when establishing the raw file of secondary circuit for the mutual inductor of substation, the mutual inductor ginseng of whole station is further included in raw file Number, the transformer parameter includes circuit number, winding, purposes, polarity, secondary polarity, a no-load voltage ratio, and records in detail secondary Voltage circuit, the earth point in secondary current circuit are accurate to screen cabinet and terminal number.
- 3. a kind of secondary loop of mutual inductor of transformer substation exception electrification detection system, it is characterised in that including：Raw file establishes program unit, and the mutual inductor for being directed to substation in advance establishes the raw file of secondary circuit, institute Stating secondary circuit includes the secondary voltage circuit of three-phase and four-line formula form of substation's mutual inductor and secondary current circuit, described The raw file of secondary circuit includes the electric current neutral point current in the secondary voltage circuit of mutual inductor and secondary current circuit With standard value of the earth current under mutual inductor normal operation；When needing to carry out transformer secondary circuit exception live detection, It redirects and performs voltage and current detecting program unit；Voltage and current detecting program unit, for being directed to the mutual inductor of charging operation, detection records secondary electricity under charging operation Push back the electric current neutral point current and earth current in road and secondary current circuit；Secondary circuit exception determining program unit, for secondary voltage circuit and secondary electricity under obtained charging operation will to be detected Electric current neutral point current in road and earth current are flowed back to respectively compared with its standard value in raw file, if appointed Anticipating, voltage or electric current are unequal with its standard value numerical value in raw file and deviation is more than predetermined threshold value, then judge power transformation Transformer secondary circuit of standing is abnormal.
- 4. secondary loop of mutual inductor of transformer substation exception electrification detection system according to claim 3, which is characterized in that described Raw file establishes transformer parameter of the program unit including whole station and establishes program module, and the transformer parameter establishes program mould The transformer parameter of block generation includes circuit number, winding, purposes, polarity, secondary polarity, a no-load voltage ratio, and records two in detail Secondary voltage circuit, the earth point in secondary current circuit are accurate to screen cabinet and terminal number.
- A kind of 5. secondary loop of mutual inductor of transformer substation exception electrification detection system, including computer, which is characterized in that the calculating Machine is programmed to perform the step of secondary loop of mutual inductor of transformer substation exception live detection method of claim 1 or 2.
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| CN201711143965.6A CN108051699A (en) | 2017-11-17 | 2017-11-17 | A kind of secondary loop of mutual inductor of transformer substation exception live detection method and system |
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| CN201711143965.6A CN108051699A (en) | 2017-11-17 | 2017-11-17 | A kind of secondary loop of mutual inductor of transformer substation exception live detection method and system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110333474A (en) * | 2019-06-28 | 2019-10-15 | 中国电力科学研究院有限公司 | A kind of method and system of on-line checking mutual inductor metering abnormality |
| CN110658377A (en) * | 2019-10-23 | 2020-01-07 | 国网山西省电力公司阳泉供电公司 | Voltage secondary opening triangular loop monitoring device |
| CN111060846A (en) * | 2019-12-19 | 2020-04-24 | 深圳供电局有限公司 | CT secondary circuit fault on-line monitoring method |
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| CN101726687A (en) * | 2009-12-10 | 2010-06-09 | 贵州电力试验研究院 | Method for monitoring one-point grounding of secondary neutral point of voltage transformer between transformer substation and power plant |
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| CN110333474A (en) * | 2019-06-28 | 2019-10-15 | 中国电力科学研究院有限公司 | A kind of method and system of on-line checking mutual inductor metering abnormality |
| CN110658377A (en) * | 2019-10-23 | 2020-01-07 | 国网山西省电力公司阳泉供电公司 | Voltage secondary opening triangular loop monitoring device |
| CN111060846A (en) * | 2019-12-19 | 2020-04-24 | 深圳供电局有限公司 | CT secondary circuit fault on-line monitoring method |
| CN111060846B (en) * | 2019-12-19 | 2022-03-22 | 深圳供电局有限公司 | CT secondary circuit fault on-line monitoring method |
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Application publication date: 20180518 |