Insulation resistance detecting method, device, and apparatus
A technology of insulation resistance and insulation resistance to ground, which can be used in measurement devices, measurement of resistance/reactance/impedance, measurement of electrical variables, etc., and can solve problems such as inaccurate detection of insulation resistance.
Active Publication Date: 2015-02-11
EMERSON NETWORK POWER CO LTD
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[0007] The embodiment of the present invention provides a method, device and equipment for insulation resistance detection, which is used to solve the problem that when the existing insulation resistance detection method is applied to a system including silicon chains, the existence of silicon chains may cause insulation resistance detection inaccurate question
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[0031] When the existing unbalanced bridge method detects the insulation resistance of the DC bus to ground, it will not first determine the location of the insulation fault in the DC bus, but for systems with silicon chains, the silicon chain divides the DC bus into closing Busbar and control busbar, since the silicon chain can be equivalent to a voltage source, this will cause the voltage difference between the closing busbar and the ground wire to be not equal to the voltage difference between the control busbar and the ground wire. After the DC bus is determined to have an insulation fault, if the current flowing through the insulation resistance of the positive DC bus is determined according to the voltage difference between the positive closing bus and the ground wire, the current flowing through the insulation resistance of the positive DC bus is determined according to the voltage difference between the negative closing bus and the ground wire. The current of the insula...
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The embodiment of the invention provides an insulation resistance detecting method, device, and apparatus used for solving a problem of inaccurate insulation resistance detection probably caused by the existence of silicon chains when a conventional insulation resistance detecting method is applied to a system containing silicon chains. The method comprises steps of: connecting a first resistor unit with a preset resistance value between a positive DC bus and a ground wire and connecting a second resistor unit with a preset resistance value between a negative DC bus and the ground wire after an insulation fault position of the DC bus is determined; determining current flowing through a third resistor and current flowing through a fourth resistor according to the insulation fault position of the DC bus; and determining the resistance value of the third resistor and the resistance value of the fourth resistor according to a fact that the sum of the current flowing through the first resistor unit, the current flowing through the second resistor unit, the current flowing through the third resistor, and the current flowing through the fourth resistor is zero.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a method, device and equipment for detecting insulation resistance. Background technique [0002] The power system is a floating system. The insulation performance of the positive DC bus and the negative DC bus to the ground will decrease with the aging of electrical equipment or the influence of external factors. The decline in insulation performance may cause the relay protection device on the output side of the DC system to malfunction. Action, and then lead to electrical safety accidents. Therefore, there must be an insulation resistance detection device in the power system to monitor the insulation status of the DC bus to the ground for a long time. [0003] The commonly used methods for testing the insulation resistance of the DC bus to ground are the balanced bridge method and the unbalanced bridge method, also known as the voltage mode method and the resistance...
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IPC IPC(8): G01R27/08
Inventor 李晨光张武强胡运平
Owner EMERSON NETWORK POWER CO LTD