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A ground detection circuit

A technology of ground detection and resistance detection, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems that the grounding threshold cannot be accurately set and the detection effect is not good, so as to reduce the floating range, accurately set, The effect of improving the detection effect

Active Publication Date: 2017-12-12
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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Problems solved by technology

When the discharge branch is used for ground detection, the detection voltage on the second voltage sensor VH2 is difficult to overcome the problem that the ground threshold cannot be accurately set due to the serious voltage fluctuation caused by other conduction interference on the main circuit, resulting in poor detection effect

Method used

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Embodiment Construction

[0032] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0033] The present invention provides a ground detection circuit, such as figure 2 As shown, the ground detection circuit includes a first detection resistor R1 and a second detection resistor R2. One end of the first detection resistor R1 is connected to the positive bus (+KM), and the other end is connected to one end of the second detection resistor R2. The second detection resistor The other end of R2 i...

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Abstract

The invention discloses a grounding detection circuit, which belongs to the technical field of detection. The grounding threshold of the grounding detection circuit can be set relatively accurately, which ensures the detection effect of the grounding detection circuit. The ground detection circuit includes a first detection resistor and a second detection resistor, one end of the first detection resistor is connected to the positive bus, the other end is connected to one end of the second detection resistor, and the other end of the second detection resistor is connected to the negative bus; the ground detection circuit It also includes a ground detection module, one end of the ground detection module is grounded, and the other end is connected to the connection point of the first detection resistor and the second detection resistor.

Description

technical field [0001] The invention relates to the technical field of ground detection, in particular to a ground detection circuit. Background technique [0002] The main circuit of the traction converter mainly includes rectification circuit, support capacitor, inverter circuit, traction motor and discharge branch. During operation, factors such as cable aging, vibration and friction may cause the main circuit of the traction converter to be grounded. Generally speaking, single-point grounding of the main circuit will not have a significant impact on the normal operation of the traction converter; but two-point grounding or multi-point grounding may generate a large short-circuit current, which may burn equipment and wires, seriously Affect the safety and reliability of the normal operation of the traction converter. Therefore, it is very important to be able to accurately and quickly detect ground faults for engineering personnel to judge and deal with. [0003] The d...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02
Inventor 胡家喜杨进锋李彦涌向言丰张文进罗剑波何正科武丹刘猛罗成姜耀伟
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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