DC system insulation monitoring device and method
A technology of insulation monitoring device and DC system, applied in the direction of measurement device, measurement of electrical variables, measurement of resistance/reactance/impedance, etc., can solve the problems of difficulty in distinguishing AC intrusion, lack of monitoring means and fault alarm measures, etc., and achieves a simple structure. , High practicability and easy maintenance
Active Publication Date: 2015-10-14
SHANDONG ZHIYANG ELECTRIC
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Problems solved by technology
At present, the substation site lacks effective monitoring means and fault alarm measures for "AC intrusion into DC fault", and it is even more difficult to distinguish which kind of AC intrusion occurs
Method used
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Embodiment Construction
[0035] Embodiments of the present invention are further described below in conjunction with accompanying drawings:
[0036] like Figure 1 to Figure 5 As shown, the DC system insulation monitoring device described in the present invention includes a first CPU processor, a second CPU processor and a third CPU processor, the first CPU processor is connected to the second CPU processor through a dual-port RAM, and the second CPU processor is connected to the second CPU processor. The two CPU processors are connected to the third CPU processor through the RS458 interface, the first CPU processor is connected to the first sampling circuit and the DC voltage input circuit, the second CPU processor is connected to the liquid crystal display circuit and memory, and the third CPU processor is connected to the second Sampling circuit and branch sensor input circuit.
[0037] Among them, such as Image 6 As shown, the first sampling circuit includes an AC voltage sampling circuit and a...
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The invention discloses a monitoring device and method, and particularly relates to an insulation monitoring device and method for a DC system. The insulation monitoring device and method for the DC system is especially applied to insulation monitoring and locating when AC jumps into the DC system. The insulation monitoring device comprises a first CPU, a second CPU and a third CPU. The first CPU is connected with the second CPU through a dual-port RAM, the second CPU is connected with the third CPU through an RS 458 port, the first CPU is connected with a first sampling circuit and a DC voltage input circuit, the second CPU is connected with a liquid crystal display circuit and a memorizer, and the third CPU is connected with a second sampling circuit and a branch sensor input circuit. When a fault that the AC jumps into the DC system happens to the DC system, the monitoring device can be used for monitoring the insulation resistance of the DC system, locating a fault branch and calculating AC input impedance of the branch which the AC jumps into; when the fault that the AC jumps into the DC system does not happen, the insulation monitoring device can be used for monitoring the insulation resistance of the DC system and locating an insulation lowering branch, and is favorable for field staff to maintain the DC system for safety running.
Description
technical field [0001] The invention discloses a monitoring device and method, in particular to a DC system insulation monitoring device and method, especially insulation monitoring and positioning when AC intrusion occurs in the DC system. Background technique [0002] The safe and reliable operation of DC power supply is very important for the safe and reliable operation of substations. However, due to the large number of DC power supply devices and long power supply cables, faults such as DC grounding often occur in actual operation. Although the DC system runs floating, the single-point grounding does not affect the normal operation of the system, but the fault must be found and eliminated as soon as possible, otherwise, when the second point grounding occurs, the relay or protection device will malfunction and cause serious consequences. At present, DC system insulation and line selection devices are widely used in substations, which have achieved good results. [000...
Claims
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IPC IPC(8): G01R27/14
Inventor 徐学来张万征刘国永许克
Owner SHANDONG ZHIYANG ELECTRIC