Switching insulation monitoring method and system for DC power supply system
A technology of insulation monitoring and power supply system, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problem of untimely monitoring of hidden dangers of insulation, and achieve the effect of improving monitoring efficiency and saving time for ground current stabilization.
Active Publication Date: 2015-12-02
DELTA GREENTECH CHINA CO LTD
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Problems solved by technology
[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a switching insulation monitoring method and system for a DC power supply system, which is used to solve the problem of untimely monitoring of hidden dangers in the prior art
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[0032]Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.
[0033] Such as figure 1 As shown, the present invention provides a switching insulation monitoring method for a DC power supply system. Wherein, the DC power supply system includes a busbar. The monitoring method is mainly performed by an insulation monitoring system. The insulation monitoring system includes: a ground detection switch circuit that is respectively set on the positive and negative poles of the bus bar and is alternatel...
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The invention provides a switch insulation monitoring method and a switch insulation monitoring system for a direct-current power supply system. The method comprises the steps that during a period that earth current on an anode / cathode circuit of a bus changes due to the fact that a detector switching circuit is alternately opened and closed, three earth voltage sampling values of the anode / cathode circuit of the bus are sampled at intervals at the first time; a voltage value after an anode / cathode is earthed and stabilized is predicted based on the three sampled earth voltage sampling values; an equivalent earth insulation resistance value on an anode / cathode power supply circuit is correspondingly confirmed based on the predicted voltage value; and whether the anode / cathode power supply circuit has an earth insulation fault is correspondingly confirmed according to comparison between the confirmed equivalent earth insulation resistance value and a preset threshold. According to the method and the system, earth voltage after the anode / cathode circuit is stabilized is predicted quickly during the period that the earth current changes, so that a circuit with the earth insulation fault in the anode / cathode circuit of the bus of the direct-current system can be monitored in real time.
Description
technical field [0001] The invention relates to a monitoring method for a DC power supply system, in particular to a switching-type insulation monitoring method and system for a DC power supply system. Background technique [0002] The DC power supply system (HVDC system) is a new type of power supply for the modern Internet data center (IDC) communication room and electric vehicle charging system. It is a huge multi-branch power supply network. or 336V). In the application process, the insulation faults with the most safety hazards are single-point grounding or single-pole insulation drop faults. Single-point grounding or single-pole insulation drop sometimes does not affect the normal operation of the HVDC system and is concealed. However, if the ground fault point cannot be quickly found and repaired, it may cause personal safety accidents to users. Once a pole ground fault occurs , it will cause the power supply failure of the HVDC system and affect the continuity of t...
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IPC IPC(8): G01R31/02
Inventor 董玉兵张永陈原
Owner DELTA GREENTECH CHINA CO LTD