CN103777171A - Testing method of exciting characteristic curve of current transformer - Google Patents
Testing method of exciting characteristic curve of current transformer Download PDFInfo
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- CN103777171A CN103777171A CN201410039628.2A CN201410039628A CN103777171A CN 103777171 A CN103777171 A CN 103777171A CN 201410039628 A CN201410039628 A CN 201410039628A CN 103777171 A CN103777171 A CN 103777171A
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Abstract
The invention discloses a testing method of an exciting characteristic curve of a current transformer. The technical problem that in the prior art, excitation characteristic testing can not be conducted on current transformers with high saturation voltages is solved. Two outgoing line terminals of a primary side coil (NP) of the detected current transformer are set in a circuit broken state; the equivalent value Uct and the frequency of square wave direct voltages which are applied between terminals of a secondary coil of the detected current transformer and has the fifty percent duty ratio are changed, so that the equivalent value of the DC currents in the secondary coil is obtained, and therefore the exciting characteristic curve can be obtained. The testing method of the exciting characteristic curve of the current transformer has the advantages of being simple, convenient to manufacture and maintain, compact in testing structure, high in reliability and accurate in testing.
Description
Technical field
The present invention relates to a kind of method of testing of characterisitic parameter of current transformer, particularly a kind of method of the exciting characteristic curve of current transformer being carried out to accurate test.
Background technology
Current transformer is widely used in electric system; a winding of current transformer is to be generally connected in power circuit; the external circuit of the Secondary Winding of current transformer generally connects relay protection and automaton; be related to the normal operation of the secondary device in electrical network to being applied to the Accurate Determining of parameters of the current transformer in electrical network, so the safe and stable operation of whole electrical network.Therefore, before current transformer is applied to electrical network, be according to relative national standards, its indices is carried out to Accurate Determining, 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 completes 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 heaviness, 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 transformers will be up to 15 kilovolts, tester cannot have been exported so high voltage, causes the test of current transformer excitation property to carry out.
Summary of the invention
The invention provides a kind of method of testing of current transformer exciting characteristic curve, solved prior art and cannot carry out the high current transformer of saturation voltage the technical matters of excitation characteristic test.
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 under off state;
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 is that dutycycle is 50% the adjustable pulse dc power of output frequency;
The 3rd step, according to the output rating of the secondary rated current of tested current transformer and tested current transformer, calculate the initial setting magnitude of voltage of test output;
The output voltage of the 4th step, 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 to 50 hertz, start adjustable DC power supply, make the pulsed dc voltage of four cycles of its output, read the initial current value of DC ammeter, obtain the respective coordinates value of first exciting characteristic curve of tested current transformer;
The 5th step, the second output voltage values of adjustable DC power supply is set, method is as follows:
If the initial current value that the 4th step obtains and the product of initial setting magnitude of voltage are 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 initial current value that the 4th step obtains and the product of initial setting magnitude of voltage are 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 initial current value that the 4th step obtains and the product of initial setting magnitude of voltage are 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 initial current value that the 4th step obtains and the product of initial setting magnitude of voltage are 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;
The 6th step, the second output frequency of adjustable DC power supply is set, if when the second output voltage values obtaining according to the 5th step is less than or equal to 80 volts, the second output frequency is set to 50 hertz, if when the second output voltage values obtaining according to the 5th step is greater than 80 volts, the second output frequency is set to (80/ second output voltage values) × 50 hertz;
The 7th step, the cycle of the second pulsed dc voltage of adjustable DC power supply output 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 of adjustable DC power supply output 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 of adjustable DC power supply output is 2 cycles;
The 8th step, with the cycle of determined the second output voltage values of the 5th step, determined the second output frequency of the 6th step and determined the 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;
The 9th step, the 3rd output voltage values of adjustable DC power supply is set, replace the initial current value of DC ammeter with the second current value of DC ammeter, with the second output voltage values replacement initial setting magnitude of voltage, the step that repeats the 5th step to the eight steps obtains the respective coordinates value of the 3rd exciting characteristic curve of tested current transformer; The step that repeats successively the 5th step to the eight steps obtains the each point respective coordinates of tested current transformer exciting characteristic curve, until tested current transformer is while reaching capacity;
The characteristic each point respective coordinates value that the tenth step, basis obtain is above drawn out the exciting characteristic curve of tested current transformer.
The inventive method is simple, manufactures easy to maintenancely, has test structure compactness, 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 under off state;
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 is that dutycycle is 50% the adjustable pulse dc power of output frequency;
The 3rd step, according to the output rating P of the secondary rated current Ie of tested current transformer and tested current transformer, calculate the initial setting magnitude of voltage Uct1 of test output, computing formula is: Uct1=P/Ie;
The output voltage of the 4th step, 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 to 50 hertz, start adjustable DC power supply Uct, make the pulsed dc voltage of four cycles of its output, 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;
The 5th step, the second output voltage values Uct2 of adjustable DC power supply Uct is set, 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 that sets 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 that sets 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 that sets 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 that sets adjustable DC power supply Uct is 1.01Uct1;
The 6th step, the second output frequency f2 of adjustable DC power supply Uct is set, if when the second output voltage values Uct2 obtaining according to the 5th step is less than or equal to 80 volts, the second output frequency f2 is set to 50 hertz, if when the second output voltage values Uct2 obtaining according to the 5th step is greater than 80 volts, the second output frequency f2 is set to (80/Uct2) × 50 hertz;
The 7th step, the cycle of the second pulsed dc voltage of adjustable DC power supply Uct output 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 of adjustable DC power supply Uct output 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 of adjustable DC power supply Uct output is 2 cycles;
The 8th step, with the cycle of determined the second output voltage values Uct2 of the 5th step, determined the second output frequency f2 of the 6th step and determined the second pulsed dc voltage of the 7th step, start adjustable DC power supply Uct, and read the second current value I ct2 of DC ammeter Ict, obtain the respective coordinates value (Ict2, Uct2) of second exciting characteristic curve of tested current transformer;
The 9th step, the 3rd output voltage values Uct3 of adjustable DC power supply Uct is set, replace Ict1 with Ict2, replace Uct1 with Uct2, the step that repeats the 5th step to the eight steps obtains the respective coordinates value (Ict3, Uct3) of the 3rd exciting characteristic curve of tested current transformer; The step that repeats successively the 5th step to the eight steps obtains the each point respective coordinates of tested current transformer exciting characteristic curve, until tested current transformer is while reaching capacity;
The characteristic each point respective coordinates value that the tenth step, basis obtain is above drawn out the exciting characteristic curve of tested current transformer.
Method of testing of the present invention is to be applied to by change square wave direct current voltage equivalence value Uct and its frequency that the dutycycle between the secondary coil terminal of tested current transformer is 50%, just can obtain the DC current equivalence value in secondary coil, thereby obtain exciting characteristic curve.Specifically because mutual inductor can not work long hours under some test modes, otherwise the possibility of being burnt will be there is, therefore also to control the time span of its test, the number of the voltage square wave applying, by apply amplitude control voltage on the secondary coil of tested current transformer, the control and the voltage square wave frequency control that apply voltage time, complete characteristic test.
Current transformer is carried out exciting characteristic curve test time, can equivalence become primary side Np in off-state, that is: primary side terminals P 1, not link of P2 outside.This off-state primary side parameter on exciting characteristic curve without impact.Second siding ring is because in fact it exist inductance, eddy current resistance, resistance, and 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, tetra-parts of equivalent principal reactance Lm.Carrying out exciting characteristic curve when test, at the negative terminal of the S1 of Current Transformer Secondary side termination DC ammeter, at the anode of the positive termination adjustable DC power supply of DC ammeter, the negative terminal of adjustable DC power supply is held and is connected with the S1 of Current Transformer Secondary side.
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 under off state;
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) is that dutycycle is 50% the adjustable pulse dc power of output frequency;
The 3rd step, according to the output rating (P) of the secondary rated current (Ie) of tested current transformer and tested current transformer, calculate the initial setting magnitude of voltage (Uct1) of test output, computing formula is: Uct1=P/Ie;
The output voltage of the 4th step, 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 to 50 hertz, start adjustable DC power supply (Uct), make the pulsed dc voltage of four cycles of its output, 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;
The 5th step, second output voltage values (Uct2) of adjustable DC power supply (Uct) is set, 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;
The 6th step, second output frequency (f2) of adjustable DC power supply (Uct) is set, if when the second output voltage values (Uct2) obtaining according to the 5th step is less than or equal to 80 volts, the second output frequency (f2) is set to 50 hertz, if when the second output voltage values (Uct2) obtaining according to the 5th step is greater than 80 volts, the second output frequency (f2) is set to (80/Uct2) × 50 hertz;
The 7th step, the cycle of the second pulsed dc voltage of adjustable DC power supply (Uct) output 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 of adjustable DC power supply (Uct) output 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 of adjustable DC power supply (Uct) output is 2 cycles;
The 8th step, with the cycle of the 5th determined the second output voltage values of step (Uct2), the 6th determined the second output frequency of step (f2) and determined the 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;
The 9th step, the 3rd output voltage values (Uct3) of adjustable DC power supply (Uct) is set, with the second output voltage values (Ict2) replacement initial current value (Ict1), with the second output voltage values (Uct2) replacement initial setting magnitude of voltage (Uct1), the step that repeats the 5th step to the eight steps obtains the respective coordinates value (Ict3, Uct3) of the 3rd exciting characteristic curve of tested current transformer; The step that repeats successively the 5th step to the eight steps obtains the each point respective coordinates of tested current transformer exciting characteristic curve, until tested current transformer is while reaching capacity;
The characteristic each point respective coordinates value that the tenth step, basis obtain is above drawn out the exciting characteristic curve of tested current transformer.
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| CN105699828A (en) * | 2016-04-25 | 2016-06-22 | 国网浙江省电力公司电力科学研究院 | Discharge coil excitation characteristic test loop |
| CN106405260A (en) * | 2015-07-30 | 2017-02-15 | 群光电能科技股份有限公司 | Magnetic saturation point measuring device for energy storage element and magnetic saturation point measuring method |
| CN107703368A (en) * | 2017-10-10 | 2018-02-16 | 广东电网有限责任公司电力科学研究院 | A kind of measuring method of inductance under transformer depth 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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| 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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