Ground insulation impedance detection method, circuit and equipment with circuit

It is a technology of ground insulation and impedance detection, which is used in the measurement of ground resistance, the conversion of irreversible DC power input to AC power output, and the voltage divider. It can solve the problems of inaccurate detection results of the detection scheme.
CN102798761AActive Publication Date: 2012-11-28SUNGROW POWER SUPPLY CO LTD
8 Cites 20 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SUNGROW POWER SUPPLY CO LTD
Publication Date
2012-11-28

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The embodiment of the invention discloses a ground insulation impedance detection method, a circuit and equipment with the circuit. The circuit consists of a first voltage division circuit and a second voltage division circuit, wherein the first voltage division circuit is connected between a first output terminal and a ground wire; and the second voltage division circuit is connected between a second output terminal and the ground wire. The ground insulation impedance detection method comprises the following steps: enabling the resistance ratio of the first voltage division circuit and the second voltage division circuit to be changed from N to 1 / N to N; respectively acquiring voltages at two ends of the first voltage division circuit and the second voltage division circuit under three circuit states; obtaining a first equation, a second equation and a third equation with the detected ground insulation impedance as an independent variable according to a series connection voltage division principle; respectively solving to obtain ground insulation impedance values of the first output terminal and the second output terminal by the simultaneous equations of the first equation, the second equation, and the third equation; and taking a minimum value as the detection result. The equipment with the circuit comprises a junction box and an inverter. According to the ground insulation impedance detection method provided by the invention, the detection accuracy of ground insulation impedance is improved and the problem that the detection result of a traditional detection scheme is inaccurate is solved.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a method and a circuit for detecting the insulation resistance of a DC power supply to ground. Background technique

[0002] The DC power supply (such as electric vehicle power battery, photovoltaic array, etc.) has poor insulation resistance to the ground or the resistance value is lower than the specified value of the safety regulations, which will cause the DC power supply to form a high voltage to the ground, and then cause the shell of the equipment using the DC power supply to be charged. Not only is the equipment easily damaged, but it also poses a huge threat to personal safety. Therefore, it is necessary to detect the insulation resistance of the DC power supply to the ground, so as to take corresponding adjustment measures in time to ensure that the insulation resistance always meets the safety requirements.

[0003] The existing insulation resistance detection scheme obtains the positive pole-to-ground insulation re...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More