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A special charging isolation injection device for defect detection and its use method

An injection device and defect detection technology, applied in the direction of overload protection device, etc., can solve the problems of strict secondary voltage drop assessment, can not obviously change the power factor and load of the secondary circuit, and achieve a good rational effect

Active Publication Date: 2022-04-08
QUJING POWER SUPPLY BUREAU YUNNAN POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] PT secondary injection has high feasibility, but the PT secondary pressure drop assessment is very strict, and the injection device cannot significantly change the power factor and load of the secondary circuit

Method used

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  • A special charging isolation injection device for defect detection and its use method

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Embodiment 1

[0026] Embodiment 1: as figure 1 As shown, assuming that the application environment is the secondary circuit of a 220kV capacitive voltage transformer, the special charged isolation injection device for this defect detection includes a phase A coupling injection capacitor, a B phase coupling injection capacitor, a C phase coupling injection capacitor, and a signal generator , voltage waveform measurement analog-to-digital converter, microcontroller, IoT module, phase A coupling injection capacitor, phase B coupling injection capacitor, and phase C coupling injection capacitor are respectively connected to the secondary terminals of the voltage transformer, and the phase A coupling injection capacitor includes Two voltage-dividing capacitors 1 (capacity 100PF), voltage-dividing capacitor 2 (capacity 100PF) and control switches are connected in series; B-phase coupling injection capacitors include two voltage-dividing capacitors 3 (capacity 100PF) and voltage-dividing capacitor ...

Embodiment 2

[0031] Embodiment 2: The device structure of this embodiment is the same as that of Embodiment 1, and the method of using the device also includes the analysis of communication control with a signal generator, and the steps are as follows:

[0032](1) When the signal generator is started, in order to generate a resonant shock wave, an inductor is connected in series at the output end of the signal generator, and after the output of the signal generator is stable (such as 4.5V), a signal to turn off the switch is sent through the microprocessor, and at the same time The processor disconnects the three control switches through the IoT module, thereby cutting off the capacitive branch of the three-phase coupling injection capacitor; at the moment of cutting off the capacitive branch, the PT self-induced electromotive force produces a relatively high and steep high-frequency wave (such as 30V ), the high-frequency wave is instantly coupled to the primary high-voltage side through t...

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Abstract

The invention discloses a special charged isolation injection device for defect detection, which includes a three-phase coupling injection capacitor, a signal generator, an analog-to-digital converter for voltage waveform measurement, a microcontroller, an IoT module, and a secondary terminal of a voltage transformer Three-phase coupling injection capacitors are connected, and each phase coupling injection capacitor includes two voltage dividing capacitors and control switches in series; the signal generator is connected to the BNC signal injection port of the three-phase coupling injection capacitors and the analog-to-digital converter for voltage waveform measurement, respectively. The IoT module is connected to the control switch in the three-phase coupling injection capacitor, the microcontroller is connected to the signal generator, the voltage waveform measurement analog-to-digital converter, and the IoT module, and the IoT module is connected to the antenna; the device of the present invention has relatively Good rationality and operability; it can evaluate the state of the voltage transformer itself, and has the characteristics of module self-inspection, voltage transformer diagnosis, and voltage boosting.

Description

technical field [0001] The invention relates to a special charged isolation injection device for defect detection, which belongs to the technical field of electric equipment. Background technique [0002] When carrying out on-site power equipment tests, it is usually a power failure test or a simple signal reception working mode in a live state; however, actual research has found that it is necessary to carry out a signal injection test in a live environment. [0003] For the operation of high-voltage equipment, the most critical aspect of applying signals is safety, and the application of signal sources should not cause the system to reduce the insulation to the ground and cause new hidden dangers. A typical coupling injection method is secondary injection through a current transformer or a voltage transformer. However, since the primary side of the current transformer usually has only one turn or a few turns of the coil, it is difficult to inject a detectable voltage valu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R1/36
CPCG01R1/36
Inventor 毛兴陶水东崔兴朱良杨子力王路军唐志宇
Owner QUJING POWER SUPPLY BUREAU YUNNAN POWER GRID CO LTD