Method for detecting and monitoring high-resistance ground fault by online zero setting and test device thereof
A technology for monitoring high-resistance and ground faults. It is applied in the direction of measuring devices, fault locations, and measuring electricity. It can solve problems such as the inability to overcome the influence of distributed capacitance, and achieve the effects of eliminating DC signal drift, truly receiving signals, and eliminating distributed capacitance.
Active Publication Date: 2011-01-26
XINJIANG WELL ELECTRONICS TECH
View PDF4 Cites 7 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
In the case of high-impedance faults, the influence of distributed capacitance cannot be overcome
④Phase method - On the basis of the frequency conversion detection method, a high-frequency signal is modulated to distinguish resistive and capacitive currents through phase changes. When a high-impedance fault occurs, the influence of distributed capacitance cannot be overcome.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0018] A method for online zero-setting detection and monitoring of high-resistance grounding faults, such as Figure 1 to Figure 6 As shown, it includes a DC waveform signal generator and a DC current signal receiver that can generate a DC tooth wave signal. The claws of the clamp transformers of all the above-mentioned DC current signal receivers are sequentially stuck on the faulty line connected to the electrical equipment. Constitute one or more stuck line points;
[0019] (I) Connect one of the two signal output terminals of the DC waveform signal generator to one end of the faulty line, and the other terminal to the ground or to the other end of the faulty line, and use the DC waveform signal generator to apply a voltage to the faulty line. The DC tooth wave signal makes the applied DC tooth wave signal pass through the fault line to form a closed circuit of the DC tooth wave current, and in turn the DC current signal receiver receives the DC tooth wave through its claw...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for detecting and monitoring high-resistance ground fault by online zero setting and a test device thereof. A direct current (DC) sawtooth wave signal is applied to a fault equipment line; when at a low level, the signal is in a zero setting period, and when at a high level, the signal is in a test period; after a DC current signal receiver is clamped on the faulty line, the signal is received; DC online zero setting is performed in the zero setting period of the signal, and online test is performed in the test period of the signal; and therefore, the ground fault point (or line mixing, short circuit) can be determined directly without turning off the electric equipment (power supply), throwing line or releasing line bundle; moreover, the test device comprises a DC sawtooth wave signal generator and a DC current signal receiving tester, wherein the DC sawtooth wave signal generator can generate the DC sawtooth wave signal; an intelligent control module, a wireless transceiver and a wire signal transceiver module are arranged in each of the DC sawtooth wave signal generator and the DC current signal receiving tester; and the test method can be automatically realized. Through the method and the device, the online zero setting is performed in the zero setting period when the DC sawtooth wave is at low level and the online test is performed in the test period when the DC sawtooth wave is at high level after line clamp, and therefore personal error and DC signal shift are thoroughly eliminated.
Description
technical field [0001] The invention relates to a method for detecting a high-resistance grounding circuit fault through a waveform generator and a waveform receiver and the improvement of its device structure, especially a method for online zero-setting detection and monitoring of a high-resistance grounding fault and a testing device thereof. Background technique [0002] Equipment (power supply) grounding (or mixed line, short circuit) fault is a great hidden danger affecting the normal use and safety of equipment. There are currently known ways to find such faults as follows: ①Low-frequency signal injection method - After a ground fault occurs in the equipment (power supply), a low-frequency signal is injected between the grounded power supply and the ground, and the low-frequency current flows out from the signal generator and passes through The grounding point is returned from the ground, and the clamp-type current probe is used to detect point by point, trace the dire...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/02
Inventor 李富良
Owner XINJIANG WELL ELECTRONICS TECH