Resistor device for direct-current system earth test
A technology of resistance device and DC system, applied in the direction of measuring device, measuring electricity, measuring electrical variables, etc., can solve the problems of inconvenience to carry, expensive calibration instruments, protection of misoperation or refusal to operate, etc., and achieves convenient portability and low cost. Effect
Inactive Publication Date: 2018-09-21
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology
[0004] The present invention provides a resistance for the DC system grounding test in order to solve the problem that in the prior art, the protection malfunction or refusal is easily caused by the DC system grounding test, and the existing DC system insulation monitoring device calibration instrument is expensive and not easy to carry. device
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Embodiment 1
[0026] Such as figure 1 , figure 2 , image 3 As shown, a resistance device for DC system grounding test includes a housing 1, and also includes an operation panel 2 arranged on the front of the housing 1 and a test circuit arranged inside the housing 1; The operation panel 2 is electrically connected.
[0027] More specifically, the test circuit includes a test resistor 6, a gear selection switch 3 and an output interface 4; the test resistor 6 is electrically connected to the gear selection switch 3; the gear selection switch 3 is connected to the The output interface 4 is electrically connected.
[0028] More specifically, the gear selection switch 3 and the output interface 4 are arranged on the operation panel 2 .
[0029] More specifically, the operation panel 2 is connected to the housing 1 through fixing screws 5 .
[0030] More specifically, there are two test resistors 6, namely R1 and R2, and the resistance values of R1 and R2 are 90% of 25KΩ and 15KΩ respec...
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The invention relates to a resistor device for a direct-current system earth test. The resistor device comprises a housing, an operation panel arranged on the front surface of the housing, and a testcircuit arranged in the housing, wherein the test circuit is electrically connected with the operation panel through wires, and comprises test resistors, a gear selection switch and output interfaces;the test resistors are electrically connected with the gear selection switch; the gear selection switch is electrically connected with the output interfaces. According to the resistor device for thedirect-current system earth test provided by the invention, the test resistors, the gear selection switch and the output interfaces are arranged, the value of the adopted test resistor is close to a direct-current system insulation against ground alarm resistance value regulated by standard, so that during a test, the phenomenon that relay protection sends a false operation command or fails to operate can be avoided; the resistor device is low in cost and convenient to carry, and is suitable for different substation voltage level direct-current system earth tests.
Description
technical field [0001] The invention relates to the field of DC system maintenance of substations, and more specifically relates to a resistance device used for DC system grounding tests. Background technique [0002] The rated voltage level of the DC power supply system used in substations mainly has two voltage levels of 220V / 110V, and the corresponding alarm values of the insulation resistance of the DC bus to ground are also different. During the regular inspection or acceptance maintenance of the DC power system for the station, it is necessary to conduct a simulated grounding test on the DC bus to ensure that the DC bus insulation monitoring device and its signal circuit are intact. At present, there is no uniform and standardized resistance device for the grounding test resistor used in the simulated grounding test. Generally, a simple resistance and a test line are short-circuited for grounding or the test line is directly grounded for testing, but the direct groun...
Claims
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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 温云龙刘德志袁拓来尹雁和罗其锋吴棉廷陈俊杜李志刘正高朱文吉田锋周惠琼陈忠敏陈诗杰胡振兴易婷李梦琪何伟杰
Owner GUANGDONG POWER GRID CO LTD