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DC insulation monitor

A DC insulation and monitor technology, applied in the direction of instruments, measuring electronics, measuring devices, etc., can solve the problems of high price, submersion of effective value of zero drift, low zero drift of leakage current sensor, etc., and achieve lower requirements, lower system cost, The effect of reducing the overall cost

Active Publication Date: 2014-05-07
FONRICH NEW ENERGY TECH LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, since the DC leakage current of each branch is very small, generally in the mA or even uA level, and insulation measurement is required, the leakage current sensor is required to have a very low zero drift, and the traditional Hall current sensor cannot meet the requirements. To use expensive magnetically modulated current sensors
In essence, the reason why the traditional Hall current sensor cannot be applied to leakage current monitoring is that the zero drift of the Hall current sensor is above the mA level, so that the zero drift submerges the effective value in terms of absolute value.

Method used

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  • DC insulation monitor

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Embodiment Construction

[0009] figure 1 It is to use an embodiment of the present invention, a leakage current sensor is set on each DC branch, and a variable resistance bridge ( figure 1 Composed of R1, R2, R3, R4, S1, and S2), there is a voltage measurement circuit between the DC positive and negative poles and the ground, and the main controller is connected to the voltage measurement circuit, leakage current sensor, and resistance bridge (for clarity, figure 1 No connecting lines are drawn between them). figure 1 Among them, Rp and Rn are the ground leakage resistances on two different DC branches, they are the objects to be monitored by the system, and the corresponding Ip and In are their leakage currents to the ground. Vp and Vn are DC positive and negative voltages to ground. R2 and R3 in the resistance bridge are called balanced resistors, R1 and R4 are called unbalanced resistors, and S1 and S2 are unbalanced resistor switching switches. When the system is running normally, change the re...

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Abstract

This invention discloses a low-cost device performing online real-time detection and management on a DC system bus and the insulation state of by-passes, which is widely applicable to the detection and management for the insulation states of the power operation power supply systems, solar photovoltaic grid-connected systems, DC power supply systems, and HVDC high voltage DC power supply which have various specifications. The DC insulation monitor consist of a resistance bridge among the DC positive electrode, the DC negative electrode and the ground, a leakage current sensor on each DC by-pass, a voltage measurement circuit group and a master controller. The DC insulation monitor greatly reduces requirement for the leakage current sensor and can be realized through the traditional Hall current sensor without the expensive magnetic modulation current sensor, so that the system cost is greatly reduced.

Description

technical field [0001] The invention proposes a low-cost device for on-line real-time detection and management of the insulation state of the DC system busbar and branch circuit, which is widely used in various specifications of electric operating power supply systems, solar photovoltaic grid-connected systems, DC power supply systems, Detection and management of insulation status of HVDC high voltage direct current power supply system. Background technique [0002] In many fields such as electric power, energy, industry, telecommunications, and subways, direct current systems are used. These direct currents generally operate floating or with a neutral point grounded. In order to ensure the reliable operation of the system, it is necessary to monitor the insulation conditions of the positive and negative poles of the system busbar and each branch to the ground in real time. When the insulation resistance of a certain point to the ground is lower than the set alarm value, an ...

Claims

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Application Information

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IPC IPC(8): G01R31/02
Inventor 张永
Owner FONRICH NEW ENERGY TECH LTD
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