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CT polarity tester and test method based on waveform discrimination
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A tester and polarity technology, applied in the field of CT polarity tester based on waveform discrimination, can solve the problems of inconspicuous deflection of ammeter, affecting work efficiency, inconvenient operation, etc., to eliminate inconspicuous deflection, improve work efficiency, Simple test method
Pending Publication Date: 2019-09-17
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology
[0003] (1) It is necessary to disconnect the current loop, and then connect the ammeter in series, there is a risk of CT secondary loop open circuit;
[0004] (2) By visually observing the deflection of the ammeter pointer, there is a possibility of misjudgment, especially when the ammeter deflection is not obvious due to battery problems or circuit problems;
[0005] (3) The operation is inconvenient. At least two people are required to complete the work on this side. One person holds the ammeter, and the other person connects it in series with a meter pen, and needs to cooperate with the primary side current flow personnel, which affects work efficiency.
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Embodiment 1
[0053] Please refer to figure 1 , the embodiment of the present invention provides a CT polarity tester based on waveform discrimination, which is characterized in that it includes a DC clamp meter 10, a signal amplificationprocessing circuit 20, a CPU processor 30 and an input and output function module 40;
[0054] The DC clamp meter 10 is used to collect current response signals;
[0055] The signal amplification processing circuit 20 is used to amplify the current response signal to obtain a forward and reverse or reverse current waveform;
[0056] The CPU processor 30 is used to analyze the current waveform to determine the test result of CT polarity;
[0057] The input and output function module 40 is used to realize the output of test results or realize the input of various functions.
[0058] Preferably, the DC clamp meter 10 is a milliampere level DC clamp meter 10 .
[0059] Preferably, the signal amplification processing circuit 20 and the CPU processor 30 are i...
Embodiment 2
[0071] Please refer to image 3 Embodiment 2 of the present invention provides a CT polarity test method based on waveform discrimination, which is implemented by using the CT polarity tester based on waveform discrimination described in Embodiment 1. The method includes:
[0072] S1. Initialize each module;
[0073] S2, the LCD display screen displays the display interface;
[0074] S3. Detect whether the wireless module is started successfully; if yes, execute step S4; if not, continue to execute step S3;
[0075] S4. Perform parameter configuration on the wireless module;
[0076] S5, zeroing the DC clamp meter;
[0077] S6, the LCD display screen displays the display interface;
[0078] S7, the CPU processor detects whether the test button is pressed; if yes, then execute step S8, otherwise, continue to execute step S7;
[0079] S8, carry out CT polarity test;
[0080] S9, the CPU controls the wireless module to send the command data of the CT polarity test, and then...
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Abstract
The invention discloses a CT polarity tester and a test method based on waveform discrimination, and the tester comprises a DC clamp meter, a signal amplification processing circuit, a CPU processor and an input / output function module, wherein the DC clamp meter is used for collecting a current response signal; the signal amplification processing circuit is used for amplifying the current response signal to obtain a current waveform in the forward or reverse direction or the reverse direction; the CPU processor is used for analyzing the current waveform to determine the test result of the CT polarity; and the input / output function module is used for implementing the output of test results or the input of various functions. The invention can test the polarity of the CT without disconnecting the CT secondary circuit to eliminate the risk of opening the CT secondary circuit after the polarity test, is clear in CT polarity test result to eliminate the risk of misjudgment caused by non-obvious deflection of the ammeter or the negligence of the tester, and has simple test method, saves manpower and improves the working efficiency.
Description
technical field [0001] Embodiments of the present invention relate to the technical field of current transformers, in particular to a CT polarity tester and a test method based on waveform discrimination. Background technique [0002] Current transformer, referred to as CT. Polarity test is a test item that must be carried out after CT is newly installed or the winding is replaced. The polarity test of CT is related to the accuracy of the sampling data of the secondary system and the load test results of the differential protection belt when the equipment is put into operation, and is very important to ensure the safe and stable operation of the CT secondary circuit. The current current transformer polarity test adopts the method of connecting dry batteries in series on the primary side and connecting the mA meter in series on the secondary side, that is, connecting the dry batteries in the circuit instantaneously through the primary side, generating an instantaneous primar...
Claims
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Application Information
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