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

Inactive Publication Date: 2015-04-29
BEIJING THAISEN TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] However, there are various problems in the traditional DC insulation monitoring method: the balanced bridge method cannot accurately detect the insulation resistance value to the ground when the insulation of the two poles drops; the high voltage injection method and the unbalanced

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  • Direct current insulation monitoring method and device

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Embodiment Construction

[0033] A DC insulation monitoring method proposed by the present invention is used in a DC system to monitor the insulation of the positive and negative poles and measure the ground resistance of the positive and negative poles. It is mainly used in photovoltaic power generation systems, DC chargers, DC charging piles, DC screens, Applications such as UPS and electric vehicles.

[0034] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] In order to better understand and apply a DC insulation monitoring method and device proposed by the present invention, a detailed description will be given with the following figures as examples.

[0036] like figure 1 As shown, the present invention proposes a DC insulation monitoring method, comprising the following specific steps:

[0037] First, the circuit of the present invention includes four parts: DC sampling resistors R1m, R2m, large resistance resistors R11,...

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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.

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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Application Information

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IPC IPC(8): G01R27/18
Inventor 杜吉飞赵红雁
Owner BEIJING THAISEN TECH
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