CN106383328A - Excitation characteristic test method applicable to ultrahigh-voltage TPY current transformers - Google Patents

Excitation characteristic test method applicable to ultrahigh-voltage TPY current transformers Download PDF

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Publication number
CN106383328A
CN106383328A CN201610921346.4A CN201610921346A CN106383328A CN 106383328 A CN106383328 A CN 106383328A CN 201610921346 A CN201610921346 A CN 201610921346A CN 106383328 A CN106383328 A CN 106383328A
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China
Prior art keywords
current transformer
voltage
excitation
current
extra
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Inventor
王军
王昕�
张国辉
赵斌超
李玉敦
张婉婕
黄秉青
杨超
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
Shandong Zhongshi Yitong Group Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
Shandong Zhongshi Yitong Group Co Ltd
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Priority to CN201610921346.4A priority Critical patent/CN106383328A/en
Publication of CN106383328A publication Critical patent/CN106383328A/en
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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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The invention discloses an excitation characteristic test method applicable to ultrahigh-voltage TPY current transformers, comprising the following steps: applying a direct voltage to a secondary terminal of a current transformer, measuring a corresponding excitation current, and determining the relationship between the magnetic flux of the core of a secondary linkage winding and the voltage applied; while determining the rated frequency of the current transformer, getting a mathematical model about the relationship between the root-mean-square value of voltage and the secondary loop current in an equivalent way, and constructing a relation curve of the excitation voltage and excitation current in the excitation characteristic of the current transformer; and performing ultrahigh-voltage TPY current transformer excitation characteristic test based on a DC saturation method according to the mathematical model, applying a direct voltage to the secondary terminal of the current transformer and collecting the excitation current on the secondary terminal, connecting a test line to the secondary terminal of the transformer by means of four-line connection, and calculating the CT ratio and knee point voltage. Current transformer excitation saturation is quick, and the test efficiency is improved.

Description

A kind of excitation characteristic test method being applied to extra-high voltage TPY level current transformer
Technical field
The present invention relates to a kind of excitation characteristic test method being applied to extra-high voltage TPY level current transformer.
Background technology
Current transformer excitation property refer to transformer primary side open circuit in the case of, secondary side exciting current with added The relation of voltage, by excitation characteristic test, check that the iron core quality of the current transformer that newly puts into operation, finds current transformer Knee voltage during saturation and electric current, in order to judge that transformer Secondary Winding has or not the defects such as turn-to-turn short circuit.
Traditional current transformer excitation characteristic test method is mainly manual voltage regulation metering system, using manual regulation Self coupling boosting pressure regulator output voltage, is added to Current Transformer Secondary side, carries out reading with voltage, ammeter, then retouch by hand Paint exciting characteristic curve.Used by the method, testing equipment volume, weight are big, and wiring is complicated, poor stability, and testing efficiency is low, right TPY level current transformer in high flex point even more cannot measure.
In recent years, both at home and abroad commonly used AC frequency conversion method testing current transformer excitation property.Based on this principle Test equipment small volume, lightweight, obtain in 500 kilovolts and following electric pressure current transformer excitation characteristic test Extensively apply.However, with the continuous improvement of line voltage grade, the capacity of institute's Current Transformer and no-load voltage ratio also increase continuous Greatly, existing several kilovolts of its saturation breakpoint voltage has brought up to tens of thousands of volts, when testing such current transformer with AC frequency conversion method, institute Plus test frequency very low, lead to test period elongated, have impact on testing efficiency.It is therefore desirable to find one kind be applied to extra-high The new method of buckling power station high flex point TPY level current transformer excitation characteristic test.
Content of the invention
The present invention is in order to solve the above problems it is proposed that a kind of excitation being applied to extra-high voltage TPY level current transformer is special Property method of testing, this method can effectively shorten the extra-high voltage TPY level current transformer excitation characteristic test time, and do not affect to survey Examination accuracy, solves the slow-footed problem of existing extra-high voltage TPY level current transformer excitation characteristic test.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of excitation characteristic test method being applied to extra-high voltage TPY level current transformer, comprises the following steps：
(1) a certain DC voltage is applied on Current Transformer Secondary terminal, measures corresponding exciting current, determine secondary Linkage winding iron core magnetic flux and the alive relation of institute；
(2) when determining current transformer rated frequency, relation between equivalent voltage root-mean-square valve and secondary loop current Mathematical model, the relation curve of excitation voltage and exciting current when building current transformer excitation property；
(3) according to data model, carry out the extra-high voltage TPY level current transformer excitation property based on direct current saturation and survey Examination, applies DC voltage on Current Transformer Secondary terminal, gathers exciting current, to transformer two simultaneously on secondary terminals Secondary side terminal carries out p-wire connection using four lines connections, calculates CT no-load voltage ratio and knee voltage.
In described step (1), exciting current is corresponding with peak flux value, and excitation voltage is corresponding with root-mean-square valve.
In described step (1), the DC voltage being applied can make magnetic flux in current transformer persistently maintain a certain value, In time t, secondary linkage winding iron core magnetic flux φ (t) and the relation of this voltage are：
φ ( t ) = ∫ 0 t ( U - R c t i m ) d t
Wherein, RctFor secondary winding in current transformer resistance, imFor secondary circuit exciting current.
In described step (2), equivalent voltage root-mean-square valve U under current transformer rated frequency f and secondary linkage winding The relation of magnetic flux φ unshakable in one's determination is：
U = 2 π f 2 . φ = 2 π f 2 ∫ 0 t ( U - R c t i m ) d t .
In described step (3), when being tested, need the connection of turn-off current transformer and its secondary circuit, test is a certain During the excitation property of winding, other windings need to open a way.
In described step (3), Current Transformer Secondary terminal is signal input part is signal acquisition terminal again, transformer two Secondary side terminal carries out p-wire connection using clamp, and each test clamp of test lead all should be connected directly to current transformer Secondary terminals on.
In described step (3), during test, need the capacity of setting electric current transformer, class of accuracy, specified symmetrical short-circuit electric current times Several, specified transient dimension factor, a time constant or/and secondary time constant parameter.
In described step (3), calculating the adopted standard of flex point is IEC 60044-6.
Beneficial effects of the present invention are：
(1) direct current saturation is adopted to test extra-high voltage TPY level current transformer excitation property, by applying DC voltage, Current transformer excitation saturated velocity is fast, improves testing efficiency.And adopt AC frequency conversion method test extra-high voltage TPY level electric current mutual During sensor excitation property, knee voltage is higher, and test frequency is lower, and the testing time that each test job circulation needs gets over Long, because TPY level current transformer knee voltage used by extra-high voltage station is up to volts up to ten thousand, the therefore work efficiency of alternating current method test Far below direct current method；
(2) testing efficiency of extra-high voltage TPY level current transformer excitation property is substantially increased using DC test principle.
Brief description
Fig. 1 is current transformer excitation characteristic test schematic diagram；
Fig. 2 is using direct current method TPY level current transformer exciting characteristic curve；
Fig. 3 is using alternating current method TPY level current transformer exciting characteristic curve.
Specific embodiment：
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
The invention provides a kind of employing direct current saturation measures the side of extra-high voltage TPY level current transformer excitation property Method, including：
(1) a certain DC voltage is applied on Current Transformer Secondary terminal, measures corresponding exciting current, exciting current Corresponding with peak flux value, excitation voltage is corresponding with root-mean-square valve.
(2) DC voltage being applied can make magnetic flux in current transformer persistently maintain a certain value, in time t two Secondary linkage winding iron core magnetic flux φ (t) with the relation of this voltage is：
φ ( t ) = ∫ 0 t ( U - R c t i m ) d t
(3) equivalent voltage root-mean-square valve U under current transformer rated frequency f is with secondary linkage winding iron core magnetic flux φ's Relation is：
U = 2 π f 2 . φ = 2 π f 2 ∫ 0 t ( U - R c t i m ) d t
This is the mathematical model of relation between equivalent voltage root-mean-square valve and secondary loop current, that is, direct current method test The relation curve of excitation voltage and exciting current during current transformer excitation property.In formula, RctFor secondary winding in current transformer Resistance, imFor secondary circuit exciting current.
(4) utilize the described mathematical model of step (3), build the extra-high voltage TPY level current transformer based on direct current saturation Excitation characteristic test scheme, its test schematic diagram is as shown in Figure 1.The company of turn-off current transformer and its secondary circuit is needed during test Connect, during the excitation property of a certain winding of test, other windings need to open a way.
(5) the current transformer excitation characteristic test schematic diagram according to step (4), methods described is using mutual in electric current DC voltage is applied on sensor secondary terminals, exciting current is gathered on secondary terminals simultaneously, Current Transformer Secondary terminal is Be signal input part be signal acquisition terminal again, method of testing of the present invention to transformer, surveyed using clamp by secondary side terminal Examination line connects, and in order to eliminate the pressure drop impact of chuck contact resistance generation, will adopt four line interconnection techniques, that is, test lead is every Individual test clamp all should be connected directly on the secondary terminals of current transformer, as shown in Figure 1.
(6) during methods described test extra-high voltage TPY level current transformer, need the capacity of setting electric current transformer, class of accuracy, Specified symmetrical short-circuit electric current multiple, specified transient dimension factor, the parameter such as time constant, a secondary time constant, calculating is turned The adopted standard of point is IEC 60044-6, can lead to incorrect test result using other standards.
(7) described method of testing has obvious rapidity when testing to extra-high voltage TPY level current transformer, to other Little with alternating-current measurement method difference during the test of electric pressure current transformer.
The present invention adopts direct current saturation to test extra-high voltage TPY level current transformer excitation property, by applying unidirectional current Pressure, current transformer excitation saturated velocity is fast, improves testing efficiency.And adopt AC frequency conversion method test extra-high voltage TPY level electricity During current transformer excitation property, knee voltage is higher, and test frequency is lower, and the testing time that each test job circulation needs is just Longer, because TPY level current transformer knee voltage used by extra-high voltage station is up to volts up to ten thousand, therefore the work effect of alternating current method test Rate is far below direct current method.
Data listed in Table is to test the right of the same winding of extra-high voltage TPY level current transformer using alternating current method and direct current method Compare data.
Table 1 direct current method and the contrast of alternating current method test data
Find out from the contrast of upper table test data, for the TPY level current transformer of same winding, using direct current saturation and The saturation breakpoint voltage being recorded using AC frequency conversion method is basically identical it was demonstrated that the measuring accuracy of two kinds of principles is essentially identical, but Testing efficiency using direct current saturation is higher 6～7 times than using AC frequency conversion method.The present invention is carried significantly using DC test principle The high testing efficiency of extra-high voltage TPY level current transformer excitation property.
In order to verify the effectiveness of method of testing of the present invention, from alternating current method and direct current method respectively to 1000 kilovolts High pressure spring city station TPY level current transformer excitation property is tested, and surveyed TPY level current transformer all comprises two no-load voltage ratios and is 3000/1 and 6000/1 tapping.Respectively 3000/1 winding is tested using two methods, specific implementation step is such as Under.
Test philosophy figure is shown in technical scheme Fig. 1.Before test starts, first ensure that the primary side of current transformer is in disconnection Position, in addition to test winding, remaining Secondary Winding is all opened a way.For test winding, should carry out from current transformer winding root Wiring, wiring technique, using the four line wiring techniques referring in technical scheme, in order to ensure accuracy and the rapidity tested, needs Pre-set the relevant parameter of surveyed current transformer, including class of accuracy, no-load voltage ratio, capacity, specified symmetrical short-circuit electric current multiple, Specified transient dimension factor, time constant, secondary time constant and testing standard IEC60044-6.In order to ensure to test The safety of process, test instrument equipment needs reliable ground.After test starts, first current transformer is moved back Magnetic, then according to the cycle of operation of regulation completes to test.
The present invention utilizes direct current saturation to 1000 kilovolts of extra-high voltage spring cities station TPY level current transformer exciting characteristic curve Tested, test data is shown in Table 2, using AC frequency conversion method, 3 are shown in Table to the test data of same winding.By contrast table 2 He Table 3 data, tests the degree of accuracy base of extra-high voltage TPY level current transformer excitation property using direct current saturation and AC frequency conversion method This is consistent it is contemplated that extra-high voltage TPY level current transformer is mainly relay protection provides secondary current, and the design band of transformer Load capacity is much larger than its secondary load.Therefore in the case that measuring accuracy difference is little, pay the utmost attention to transformer excitation special Property test rapidity, according in the beneficial effect that the present invention provides, the contrast of two kinds of principle testing times is it can be seen that direct current The testing efficiency of saturation is far above AC frequency conversion method, and this can save for extra-high voltage TPY level current transformer excitation characteristic test Plenty of time.Taking 1000 kilovolts of extra-high voltage spring cities station as a example, our station has 14 intervals, and each is separated with 6 current transformers, Every current transformer has the TPY winding of 2 3000/1 and the TPY winding of 2 6000/1, tests whole station using AC frequency conversion method The used time of TPY level current transformer is 14*6*2*7+14*6*2*12=3192min, using the used time that direct current saturation is tested is 14*6*2*1+14*6*2*2=504min, saves time 2688min using direct current method, and work efficiency improves 6.3 times.
Table 2TPY level current transformer excitation characteristic test data (direct current method)
Numbering U(V) I(A) Numbering U(V) I(A)
1 18201.28 5.85381 11 3696.362 0.442124
2 17993.31 5.088904 12 2069.686 0.248664
3 17668.72 4.417188 13 1161.077 0.139965
4 17220.92 3.313553 14 634.2334 0.07871
5 16553.49 2.484919 15 263.264 0.033221
6 14982.63 1.862991 16 109.505 0.014022
7 11938.7 1.397603 17 81.3475 0.010503
8 9164.643 1.048259 18 59.4879 0.007886
9 6578.39 0.786278 19 32.7876 0.004435
10 4934.236 0.589614 20 7.3406 0.001055
Table 3TPY level current transformer excitation characteristic test data (alternating current method)
The exciting characteristic curve testing current transformer is drawn as shown in Figure 2 and Figure 3 according to test data, excitation property is bent Line assumes linear character before CT saturation, meets current transformer exciting characteristic curve feature, illustrates to adopt direct current The exciting characteristic curve that method records can accurately reflect the excitation property of current transformer.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not model is protected to the present invention The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art are not Need to pay the various modifications that creative work can make or deformation still within protection scope of the present invention.

Claims (7)

1. a kind of excitation characteristic test method being applied to extra-high voltage TPY level current transformer, is characterized in that：Walk including following Suddenly：
(1) a certain DC voltage is applied on Current Transformer Secondary terminal, measures corresponding exciting current, determine secondary linkage Winding iron core magnetic flux and the alive relation of institute；
(2) when determining current transformer rated frequency, the mathematics of relation between equivalent voltage root-mean-square valve and secondary loop current Model, the relation curve of excitation voltage and exciting current when building current transformer excitation property；
(3) according to data model, carry out the extra-high voltage TPY level current transformer excitation characteristic test based on direct current saturation, DC voltage is applied on Current Transformer Secondary terminal, gathers exciting current on secondary terminals, to transformer secondary side simultaneously Terminal carries out p-wire connection using four lines connections, calculates CT no-load voltage ratio and knee voltage.
2. a kind of excitation characteristic test method being applied to extra-high voltage TPY level current transformer as claimed in claim 1, it is special Levying is：In described step (1), exciting current is corresponding with peak flux value, and excitation voltage is corresponding with root-mean-square valve.
3. a kind of excitation characteristic test method being applied to extra-high voltage TPY level current transformer as claimed in claim 1, it is special Levying is：In described step (1), the DC voltage being applied can make magnetic flux in current transformer persistently maintain a certain value, During time t, secondary linkage winding iron core magnetic flux φ (t) and the relation of this voltage are：
φ ( t ) = ∫ 0 t ( U - R c t i m ) d t
Wherein, RctFor secondary winding in current transformer resistance, imFor secondary circuit exciting current.
4. a kind of excitation characteristic test method being applied to extra-high voltage TPY level current transformer as claimed in claim 1, it is special Levying is：In described step (2), equivalent voltage root-mean-square valve U under current transformer rated frequency f is unshakable in one's determination with secondary linkage winding The relation of magnetic flux φ is：
U = 2 π f 2 · φ = 2 π f 2 ∫ 0 t ( U - R c t i m ) d t
Wherein, RctFor secondary winding in current transformer resistance, imFor secondary circuit exciting current.
5. a kind of excitation characteristic test method being applied to extra-high voltage TPY level current transformer as claimed in claim 1, it is special Levying is：In described step (3), when being tested, need the connection of turn-off current transformer and its secondary circuit, test a certain winding Excitation property when, other windings need open a way.
6. a kind of excitation characteristic test method being applied to extra-high voltage TPY level current transformer as claimed in claim 1, it is special Levying is：In described step (3), Current Transformer Secondary terminal is signal input part is signal acquisition terminal again, and transformer is secondary Side terminal carries out p-wire connection using clamp, and each test clamp of test lead all should be connected directly to current transformer On secondary terminals.
7. a kind of excitation characteristic test method being applied to extra-high voltage TPY level current transformer as claimed in claim 1, it is special Levying is：In described step (3), need during test the capacity of setting electric current transformer, class of accuracy, specified symmetrical short-circuit electric current multiple, Specified transient dimension factor, a time constant or/and secondary time constant parameter.
CN201610921346.4A 2016-10-21 2016-10-21 Excitation characteristic test method applicable to ultrahigh-voltage TPY current transformers Pending CN106383328A (en)

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Cited By (6)

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CN107677975A (en) * 2017-10-10 2018-02-09 广东电网有限责任公司电力科学研究院 A kind of measuring method of excitation curve under transformer saturation state
CN107728098A (en) * 2017-11-17 2018-02-23 广东电网有限责任公司电力科学研究院 With the method and system of direct current method verification current transformer electrical-magnetic model parameter
CN110488215A (en) * 2019-09-17 2019-11-22 深圳市晶扬电子有限公司 Current transformer tests circuit, method and device
CN110687491A (en) * 2018-07-04 2020-01-14 漫迪医疗仪器（上海）有限公司 Detection performance evaluation device/method, medium, and processing device for magnetocardiogram system
CN112799001A (en) * 2020-12-25 2021-05-14 武汉市华英电力科技有限公司 Mutual inductor excitation characteristic testing method and system based on minimum variance algorithm
WO2024194013A1 (en) * 2023-03-17 2024-09-26 Omicron Electronics Gmbh Method and device for testing a transformer

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107677975A (en) * 2017-10-10 2018-02-09 广东电网有限责任公司电力科学研究院 A kind of measuring method of excitation curve under transformer saturation state
CN107728098A (en) * 2017-11-17 2018-02-23 广东电网有限责任公司电力科学研究院 With the method and system of direct current method verification current transformer electrical-magnetic model parameter
CN110687491A (en) * 2018-07-04 2020-01-14 漫迪医疗仪器（上海）有限公司 Detection performance evaluation device/method, medium, and processing device for magnetocardiogram system
CN110687491B (en) * 2018-07-04 2021-11-16 漫迪医疗仪器（上海）有限公司 Detection performance evaluation device/method, medium, and processing device for magnetocardiogram system
CN110488215A (en) * 2019-09-17 2019-11-22 深圳市晶扬电子有限公司 Current transformer tests circuit, method and device
CN112799001A (en) * 2020-12-25 2021-05-14 武汉市华英电力科技有限公司 Mutual inductor excitation characteristic testing method and system based on minimum variance algorithm
CN112799001B (en) * 2020-12-25 2023-09-26 武汉市华英电力科技有限公司 Method and system for testing excitation characteristics of transformer based on minimum variance algorithm
WO2024194013A1 (en) * 2023-03-17 2024-09-26 Omicron Electronics Gmbh Method and device for testing a transformer

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Application publication date: 20170208