Direct current insulation monitoring method and device

A technology of DC insulation and insulation resistance to ground, applied in the direction of impedance measurement, etc., can solve the problems of high-voltage switch tube, high cost, and great influence
CN104569607AInactive Publication Date: 2015-04-29BEIJING THAISEN TECH
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
BEIJING THAISEN TECH
Publication Date
2015-04-29
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention relates to a direct current insulation monitoring method which comprises sampling resistors, large-resistance resistors, small-resistance resistors and switching tubes. The large-resistance resistors, the small-resistance resistors and the sampling resistors are connected in series between an anode and the ground and between a cathode and the ground respectively, and the two small-resistance resistors are connected in parallel with the switching tubes respectively. Insulation resistance values of the anode and the cathode can be obtained by making and breaking the two switching tubes respectively, measuring voltage values across the sampling resistors and making calculation on the measured values. The method has the advantages that with the adoption of the low-voltage switching tubes, quick making and breaking can be achieved, the measurement speed is high, the cost is lower, and the influence of a ground capacitor in a system is small, so that the robustness and measurement precision are high. The invention further provides a direct current insulation monitoring device.
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Description

technical field

[0001] The invention relates to the technical field of photovoltaic power generation DC systems, in particular to a DC insulation monitoring method and device. Background technique

[0002] At present, with the extensive application of DC systems in industry, civil, energy and other fields, its safety has also begun to receive attention, because DC systems cannot be equipped with fast leakage protection devices like AC systems. Especially if electric vehicle charging piles and photovoltaic panels are installed outdoors, there are various possibilities such as impact, rain, water or moisture in the equipment, and cable damage, all of which can easily lead to insulation degradation. When leakage occurs in these DC systems, it is easy to cause casualties, so it is particularly important to equip DC systems with insulation monitoring devices.

[0003] However, there are various problems in the traditional DC insulation monitoring method: the balanced bridge meth...

Claims

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