CN103777171B - A kind of method of testing of current transformer exciting characteristic curve - Google Patents
A kind of method of testing of current transformer exciting characteristic curve Download PDFInfo
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- CN103777171B CN103777171B CN201410039628.2A CN201410039628A CN103777171B CN 103777171 B CN103777171 B CN 103777171B CN 201410039628 A CN201410039628 A CN 201410039628A CN 103777171 B CN103777171 B CN 103777171B
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- 238000010998 test method Methods 0.000 title claims abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 6
- 230000005284 excitation Effects 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
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Abstract
The invention discloses a kind of method of testing of current transformer exciting characteristic curve, solving prior art cannot carry out the technical matters of excitation characteristic test by the current transformer high to saturation voltage.By the first siding ring (N of tested current transformer
p) two outlet terminals be arranged on off state under; By square wave direct current voltage equivalence value Uct and its frequency that the dutycycle changed between the secondary coil terminal being applied to tested current transformer is 50%, just can obtain the DC current equivalence value in secondary coil, thus obtain exciting characteristic curve.The inventive method is simple, manufactures easy to maintenance, has test structure compact, and reliability is high and test feature accurately.
Description
Technical field
The present invention relates to a kind of method of testing of characterisitic parameter of current transformer, particularly a kind of exciting characteristic curve to current transformer carries out the method for accurately test.
Background technology
Current transformer is widely used in electric system; a winding of current transformer is generally be connected in power circuit; the external circuit of the Secondary Winding of current transformer generally connects relay protection and automaton; the Accurate Determining of the parameters of the current transformer be applied in electrical network is related to the normal operation of the secondary device in electrical network, so the safe and stable operation of whole electrical network.Therefore, before current transformer is applied to electrical network, according to relative national standards, Accurate Determining is carried out to its indices, and adjust according to test result, just can be applied to electrical network after meeting standard, current transformer exciting characteristic curve is an important content wherein.Prior art has been come by parameter test instrument of current transformer this characteristic test, this tester needs built-in stepup transformer and current lifting device, or external stepup transformer and current lifting device, just can complete characteristic test, there is tester volume heavy, the defect of poor safety performance.In addition, along with the rising of network system electric pressure, the saturation voltage of mutual inductor is more and more higher, and the saturation voltage of a lot of transient transformer will up to 15 kilovolts, tester cannot export so high voltage, causes cannot carrying out the test of current transformer excitation property.
Summary of the invention
The invention provides a kind of method of testing of current transformer exciting characteristic curve, solving prior art cannot carry out the technical matters of excitation characteristic test by the current transformer high to saturation voltage.
The present invention solves above technical matters by the following technical programs:
A method of testing for current transformer exciting characteristic curve, comprises the following steps:
The first step, two outlet terminals of the first siding ring of tested current transformer are arranged on off state under;
Second step, between two outlet terminals of the second siding ring of tested current transformer series connection access DC ammeter and adjustable DC power supply, adjustable DC power supply to be dutycycle be 50% the adjustable pulse dc power of output frequency;
3rd step, according to the secondary rated current of tested current transformer and the output rating of tested current transformer, calculate test export initial setting magnitude of voltage;
4th step, the output voltage of adjustable DC power supply is set to the initial setting magnitude of voltage that the 3rd step calculates, the initial output pulse frequency of adjustable DC power supply is set as 50 hertz, start adjustable DC power supply, it is made to export the pulsed dc voltage of four cycles, read the initial current value of DC ammeter, obtain the respective coordinates value of first exciting characteristic curve of tested current transformer;
5th step, arrange the second output voltage values of adjustable DC power supply, method is as follows:
If the product of the initial current value that the 4th step obtains and initial setting magnitude of voltage is less than the output rating of the tested current transformer of 0.03 times, the second output voltage values of setting adjustable DC power supply is the initial setting magnitude of voltage of 1.3 times;
If the product of the initial current value that the 4th step obtains and initial setting magnitude of voltage is more than or equal to the output rating of the tested current transformer of 0.03 times, and this product is less than the output rating of the tested current transformer of 0.1 times, the second output voltage values of setting adjustable DC power supply is the initial setting magnitude of voltage of 1.2 times;
If the product of the initial current value that the 4th step obtains and initial setting magnitude of voltage is more than or equal to the output rating of the tested current transformer of 0.1 times, and this product is less than the output rating of the tested current transformer of 0.5 times, the second output voltage values of setting adjustable DC power supply is the initial setting magnitude of voltage of 1.05 times;
If the product of the initial current value that the 4th step obtains and initial setting magnitude of voltage is more than or equal to the output rating of the tested current transformer of 0.5 times, the second output voltage values of setting adjustable DC power supply is the initial setting magnitude of voltage of 1.01 times;
6th step, the second output frequency of adjustable DC power supply is set, if when the second output voltage values obtained according to the 5th step is less than or equal to 80 volts, second output frequency is set to 50 hertz, when if the second output voltage values obtained according to the 5th step is greater than 80 volts, the second output frequency is set to (80/ second output voltage values) × and 50 hertz;
7th step, the cycle of the second pulsed dc voltage that adjustable DC power supply exports is set, if when the second output frequency that the 6th step is determined is more than or equal to 10 hertz, the cycle of the second pulsed dc voltage that adjustable DC power supply exports is 4 cycles, if when the second output frequency that the 6th step is determined is less than 10 hertz, the cycle of the second pulsed dc voltage that adjustable DC power supply exports is 2 cycles;
8th step, with the cycle of determined second output voltage values of the 5th step, determined second output frequency of the 6th step and determined second pulsed dc voltage of the 7th step, start adjustable DC power supply, and read the second current value of DC ammeter, obtain the respective coordinates value of second exciting characteristic curve of tested current transformer;
9th step, the 3rd output voltage values of adjustable DC power supply is set, the initial current value of DC ammeter is replaced with the second current value of DC ammeter, replace initial setting magnitude of voltage with the second output voltage values, repeat the 5th step obtains the 3rd exciting characteristic curve of tested current transformer respective coordinates value to the step of the 8th step; Repeat the 5th step obtains tested current transformer exciting characteristic curve each point respective coordinates to the step of the 8th step successively, till when tested current transformer reaches capacity;
The characteristic each point respective coordinates value that tenth step, basis obtain above is drawn out the exciting characteristic curve of tested current transformer.
The inventive method is simple, manufactures easy to maintenance, has test structure compact, and reliability is high and test feature accurately.
Accompanying drawing explanation
Fig. 1 is test circuit structure schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail:
A method of testing for current transformer exciting characteristic curve, comprises the following steps:
The first step, by the first siding ring N of tested current transformer
ptwo outlet terminals be arranged on off state under;
Second step, between two outlet terminals of the second siding ring Ns of tested current transformer series connection access DC ammeter Ict and adjustable DC power supply Uct, adjustable DC power supply Uct to be dutycycle be 50% the adjustable pulse dc power of output frequency;
3rd step, according to the secondary rated current Ie of tested current transformer and the output rating P of tested current transformer, calculate test export initial setting magnitude of voltage Uct1, computing formula is: Uct1=P/Ie;
4th step, the output voltage of adjustable DC power supply Uct is set to the initial setting magnitude of voltage Uct1 that the 3rd step calculates, the initial output pulse frequency of adjustable DC power supply Uct is set as 50 hertz, start adjustable DC power supply Uct, it is made to export the pulsed dc voltage of four cycles, read the initial current value Ict1 of DC ammeter Ict, obtain the respective coordinates value (Ict1, Uct1) of first exciting characteristic curve of tested current transformer;
5th step, arrange the second output voltage values Uct2 of adjustable DC power supply Uct, method is as follows:
If the product of the initial current value Ict1 that the 4th step obtains and initial setting magnitude of voltage Uct1 is less than the output rating P of the tested current transformer of 0.03 times, the second output voltage values Uct2 of setting adjustable DC power supply Uct is 1.3Uct1;
If the product of the initial current value Ict1 that the 4th step obtains and initial setting magnitude of voltage Uct1 is more than or equal to the output rating P of the tested current transformer of 0.03 times, and this product is less than the output rating P of the tested current transformer of 0.1 times, the second output voltage values Uct2 of setting adjustable DC power supply Uct is 1.2Uct1;
If the product of the initial current value Ict1 that the 4th step obtains and initial setting magnitude of voltage Uct1 is more than or equal to the output rating P of the tested current transformer of 0.1 times, and this product is less than the output rating P of the tested current transformer of 0.5 times, the second output voltage values Uct2 of setting adjustable DC power supply Uct is 1.05Uct1;
If the product of the initial current value Ict1 that the 4th step obtains and initial setting magnitude of voltage Uct1 is more than or equal to the output rating P of the tested current transformer of 0.5 times, the second output voltage values Uct2 of setting adjustable DC power supply Uct is 1.01Uct1;
6th step, the second output frequency f2 of adjustable DC power supply Uct is set, if when the second output voltage values Uct2 obtained according to the 5th step is less than or equal to 80 volts, second output frequency f2 is set to 50 hertz, if when the second output voltage values Uct2 obtained according to the 5th step is greater than 80 volts, the second output frequency f2 is set to (80/Uct2) × 50 hertz;
7th step, the cycle of the second pulsed dc voltage that adjustable DC power supply Uct exports is set, if when the second output frequency f2 that the 6th step is determined is more than or equal to 10 hertz, the cycle of the second pulsed dc voltage that adjustable DC power supply Uct exports is 4 cycles, if when the second output frequency f2 that the 6th step is determined is less than 10 hertz, the cycle of the second pulsed dc voltage that adjustable DC power supply Uct exports is 2 cycles;
8th step, with the cycle of the determined second output voltage values Uct2 of the 5th step, the determined second output frequency f2 of the 6th step and determined second pulsed dc voltage of the 7th step, start adjustable DC power supply Uct, and read the second current value Ict2 of DC ammeter Ict, obtain the respective coordinates value (Ict2, Uct2) of second exciting characteristic curve of tested current transformer;
9th step, the 3rd output voltage values Uct3 of adjustable DC power supply Uct is set, Ict1 is replaced with Ict2, replace Uct1 with Uct2, repeat the 5th step obtains the 3rd exciting characteristic curve of tested current transformer respective coordinates value (Ict3, Uct3) to the step of the 8th step; Repeat the 5th step obtains tested current transformer exciting characteristic curve each point respective coordinates to the step of the 8th step successively, till when tested current transformer reaches capacity;
The characteristic each point respective coordinates value that tenth step, basis obtain above is drawn out the exciting characteristic curve of tested current transformer.
Method of testing of the present invention be by change be applied to tested current transformer secondary coil terminal between dutycycle be 50% square wave direct current voltage equivalence value Uct and its frequency, just can obtain the DC current equivalence value in secondary coil, thus obtain exciting characteristic curve.Specifically because mutual inductor can not work long hours under some test modes, otherwise may by what burn by existing, therefore the time span of its test will also be controlled, the number of the voltage square wave namely applied, by applying amplitude control voltage on the secondary coil of tested current transformer, apply control and the voltage square wave frequency control of voltage time, carry out characteristic test.
Current transformer is carried out exciting characteristic curve test time, can equivalence become primary side Np be in off-state, that is: primary side terminals P 1, P2 outside not link.This off-state primary side parameter on exciting characteristic curve without impact.In fact there is inductance, eddy current resistance, resistance due to it in second siding ring, these parameters are all present between secondary side terminal S1, S2.Its actual inner parameter equivalence becomes four parts: desirable secondary side Ns, Secondary Winding equivalent resistance Rct, equivalent eddy current resistance Re, equivalent principal reactance Lm tetra-parts.When carrying out exciting characteristic curve test, the negative terminal of the S1 termination DC ammeter in Current Transformer Secondary side, the anode at the positive termination adjustable DC power supply of DC ammeter, the negative terminal of adjustable DC power supply is held with the S1 of Current Transformer Secondary side and is connected.
Claims (1)
1. a method of testing for current transformer exciting characteristic curve, comprises the following steps:
The first step, by the first siding ring (N of tested current transformer
p) two outlet terminals be arranged on off state under;
Second step, series connection access DC ammeter (Ict) and adjustable DC power supply (Uct) between two outlet terminals of the second siding ring (Ns) of tested current transformer, adjustable DC power supply (Uct) to be dutycycle be 50% the adjustable pulse dc power of output frequency;
3rd step, according to the secondary rated current (Ie) of tested current transformer and the output rating (P) of tested current transformer, calculate the initial setting magnitude of voltage (Uct1) that test exports, computing formula is: the secondary rated current (Ie) of the current transformer of the output rating (P) of the current transformer of initial setting magnitude of voltage (Uct1)=tested/tested;
4th step, the output voltage of adjustable DC power supply (Uct) is set to the initial setting magnitude of voltage (Uct1) that the 3rd step calculates, the initial output pulse frequency of adjustable DC power supply (Uct) is set as 50 hertz, start adjustable DC power supply (Uct), it is made to export the pulsed dc voltage of four cycles, read the initial current value (Ict1) of DC ammeter (Ict), obtain the respective coordinates value (Ict1, Uct1) of first exciting characteristic curve of tested current transformer;
5th step, arrange second output voltage values (Uct2) of adjustable DC power supply (Uct), method is as follows:
If the initial current value (Ict1) that the 4th step obtains is less than the output rating (P) of the tested current transformer of 0.03 times with the product of initial setting magnitude of voltage (Uct1), second output voltage values (Uct2) of setting adjustable DC power supply (Uct) is the initial setting magnitude of voltage (Uct1) of 1.3 times;
If the initial current value (Ict1) that the 4th step obtains is more than or equal to the output rating (P) of the tested current transformer of 0.03 times with the product of initial setting magnitude of voltage (Uct1), and this product is less than the output rating (P) of the tested current transformer of 0.1 times, second output voltage values (Uct2) of setting adjustable DC power supply (Uct) is the initial setting magnitude of voltage (Uct1) of 1.2 times;
If the initial current value (Ict1) that the 4th step obtains is more than or equal to the output rating (P) of the tested current transformer of 0.1 times with the product of initial setting magnitude of voltage (Uct1), and this product is less than the output rating (P) of the tested current transformer of 0.5 times, second output voltage values (Uct2) of setting adjustable DC power supply (Uct) is the initial setting magnitude of voltage (Uct1) of 1.05 times;
If the initial current value (Ict1) that the 4th step obtains is more than or equal to the output rating (P) of the tested current transformer of 0.5 times with the product of initial setting magnitude of voltage (Uct1), second output voltage values (Uct2) of setting adjustable DC power supply (Uct) is the initial setting magnitude of voltage (Uct1) of 1.01 times;
6th step, second output frequency (f2) of adjustable DC power supply (Uct) is set, if when the second output voltage values (Uct2) obtained according to the 5th step is less than or equal to 80 volts, second output frequency (f2) is set to 50 hertz, when if the second output voltage values (Uct2) obtained according to the 5th step is greater than 80 volts, the second output frequency (f2) is set to (80/ second output voltage values (Uct2)) × and 50 hertz;
7th step, the cycle of the second pulsed dc voltage that adjustable DC power supply (Uct) exports is set, if when the second output frequency (f2) that the 6th step is determined is more than or equal to 10 hertz, the cycle of the second pulsed dc voltage that adjustable DC power supply (Uct) exports is 4 cycles, if when the second output frequency (f2) that the 6th step is determined is less than 10 hertz, the cycle of the second pulsed dc voltage that adjustable DC power supply (Uct) exports is 2 cycles;
8th step, with the cycle of the 5th determined second output voltage values of step (Uct2), the 6th determined second output frequency of step (f2) and determined second pulsed dc voltage of the 7th step, start adjustable DC power supply (Uct), and read second current value (Ict2) of DC ammeter (Ict), obtain the respective coordinates value (Ict2, Uct2) of second exciting characteristic curve of tested current transformer;
9th step, the 3rd output voltage values (Uct3) of adjustable DC power supply (Uct) is set, initial current value (Ict1) is replaced with the second output voltage values (Ict2), initial setting magnitude of voltage (Uct1) is replaced with the second output voltage values (Uct2), repeat the 5th step obtains the 3rd exciting characteristic curve of tested current transformer respective coordinates value (Ict3, Uct3) to the step of the 8th step; Repeat the 5th step obtains tested current transformer exciting characteristic curve each point respective coordinates to the step of the 8th step successively, till when tested current transformer reaches capacity;
The characteristic each point respective coordinates value that tenth step, basis obtain above is drawn out the exciting characteristic curve of tested current transformer.
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| CN106405260B (en) * | 2015-07-30 | 2018-12-14 | 群光电能科技股份有限公司 | The saturation point measuring device and saturation point measurement method of energy-storage travelling wave tube |
| CN105699828B (en) * | 2016-04-25 | 2019-02-15 | 国网浙江省电力有限公司电力科学研究院 | A kind of discharge coil excitation characteristic test circuit |
| CN107703368B (en) * | 2017-10-10 | 2020-08-14 | 广东电网有限责任公司电力科学研究院 | Method for measuring inductance of transformer in deep 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 |
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