Non-contact alternating current and direct current crosstalk online detecting device and non-contact alternating current and direct current crosstalk online detecting method
A non-contact, detection device technology, applied in the direction of measuring devices, measuring current/voltage, measuring electrical variables, etc., can solve problems that affect the normal operation of operating equipment, poor installation process, and the impact of device installation process on operating equipment, etc.
Active Publication Date: 2015-04-29
STATE GRID CORP OF CHINA +2
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Problems solved by technology
However, there are two hidden dangers in the use of this device: 1) The reliability of the device affects the DC power system. Since it is connected between the positive / negative bus and the ground, the device failure is likely to directly cause DC grounding; 2) The installation process of the device Impact on operating equipment, for substations that have been put into operation, due to the electrical connection with the DC power system, poor installation technology will directly affect the normal operation of operating equipment
[0004] The on-line detection technology of AC-DC series current is not yet mature, how to accurately detect the fault of AC crossing into DC under the premise of ensuring the stable operation of the DC system has become an urgent problem to be solved
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[0022] Non-contact AC / DC series on-line detection system: such as figure 1 As shown, the non-contact AC-DC on-line detection system uses non-contact coupling capacitors and measuring capacitors to detect whether there is an AC voltage component in the DC circuit, so as to detect whether there is an AC signal entering the DC system. The non-contact AC / DC on-line detection system includes: a non-contact voltage acquisition device, a data acquisition board and a non-contact AC / DC detection module. The non-contact voltage acquisition device includes a non-contact voltage clamp. The contact voltage clamp is provided with a DC loop cable clamp, one end of the measurement capacitor is connected to the DC loop cable clamp, and the other end is grounded, and the two ends of the measurement capacitor are respectively connected to the data acquisition board, and the output end of the data acquisition board is connected to the The input end of the non-contact AC / DC series detection module...
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The invention discloses a non-contact alternating current and direct current crosstalk online detecting device. The non-contact alternating current and direct current crosstalk online detecting device is characterized by comprising a non-contact voltage acquisition device, a data acquisition plate card and a non-contact alternating current and direct current crosstalk detecting module. The non-contact voltage acquisition device comprises a non-contact voltage clamp, a direct current return cable clamp mouth is formed in the non-contact voltage clamp, one end of a measuring capacitor is connected to the direct current return cable clamp mouth, the other end of the measuring capacitor is connected to the ground, the two ends of the measuring capacitor are connected to the data acquisition plate card respectively, the output end of the data acquisition plate card is connected with the input end of the non-contact alternating current and direct current crosstalk detecting module, and a non-contact coupling capacitor is formed between the direct current return cable clamp mouth and a cable inner conductor. The non-contact alternating current and direct current crosstalk online detecting device and a non-contact alternating current and direct current crosstalk online detecting method can accurately detect the failure caused by the situation that an alternating current flows into a direct current system.
Description
technical field [0001] The invention relates to a non-contact AC / DC series testing method for a DC system of a substation, including a non-contact AC / DC on-line detection principle analysis and method and a non-contact AC / DC on-line detection system construction. The method and the system can be conveniently used for detection of AC intrusion into a DC system of a substation without touching live terminals of the substation. The method and system belong to the technical field of electric power automation. Background technique [0002] As an important part of the substation, the DC power system plays an important role in ensuring the safe operation of the equipment in the whole station. It provides power for signaling equipment, protection equipment, circuit breaker opening and closing operations, emergency lighting and other equipment. Its safe and reliable operation is crucial to the safe and reliable operation of substations. However, due to the large number of DC power ...
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IPC IPC(8): G01R19/165
Inventor 袁宇波张佳敏李鹏黄浩声许建刚陈久林
Owner STATE GRID CORP OF CHINA