Insulation monitoring device of single-arm unbalanced bridge
A technology of insulation monitoring device and balancing bridge, which is used in AC/DC measurement bridges, testing dielectric strength and other directions, can solve the problem of the voltage of the negative electrode of the system rising to the ground, and achieve the effect of preventing the voltage from rising.
Inactive Publication Date: 2018-01-19
STATE GRID SHANDONG ELECTRIC POWER +1
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Problems solved by technology
However, during the operation of the insulation monitoring device, when the positive pole-to-ground detection resistor is used, it will inevitably cause the negative pole-to-ground voltage of the system to rise, which may cause the negative pole-to-ground voltage to reach the operating voltage of the protection outlet relay, thereby providing protection for the relay protection. Malfunction provides a condition
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[0021] The present invention will be further described below in conjunction with accompanying drawing.
[0022] Such as figure 1 , 2 As shown, the single-arm unbalanced bridge insulation monitoring device of the present invention includes: an insulation monitoring host 1, including a first processor module and a first data acquisition module connected to the first processor module, a bridge circuit module, a second A communication module; leakage current sensor data acquisition control device 2, including a second processor module and a second data acquisition module connected to the second processor module, a second communication module; leakage current sensor 3, the input end of the leakage current sensor It is connected with the feeder branch, and the output terminal of the leakage current sensor is connected with the second data acquisition module; the first data acquisition module is connected with the DC positive and negative busbars, and collects the DC busbar voltage ...
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The invention relates to an insulation monitoring device of a single-arm unbalanced bridge and belongs to the technical field of power supply detection. The objective of the invention is to provide the insulation monitoring device of the single-arm unbalanced bridge. By setting an insulation monitoring host and a leakage current sensor data acquisition control device, a detection bridge resistor is connected between a negative electrode and the ground, and a corresponding bridge switching test is carried out, so the risk of maloperation of a protection device can be effectively eliminated andinsulation conditions of a direct current system and branches can be calculated. The monitoring device comprises an insulation monitoring host, a leakage current sensor data acquisition control deviceand a leakage current sensor. A first data acquisition module is connected with direct current positive and negative buses, and acquires direct current bus voltage and grounding voltage in real time.A first communication module is connected with a second communication module. A bridge circuit module comprises one group of balanced bridge resistors, corresponding grounding resistors and a detection bridge resistor connected with the direct current negative bus only. The detection bridge resistor is serially connected with an electronic switch.
Description
technical field [0001] The invention relates to a single-arm unbalanced bridge insulation monitoring device, which belongs to the technical field of power supply detection. Background technique [0002] The DC system operates in a positive and negative non-grounded manner. After one pole is grounded, it will generally not cause major safety accidents. However, when the distributed capacitance of the DC system is large enough, the voltage of the negative pole of the DC system to ground exceeds the operating voltage of the protection outlet relay, and one point is grounded. It can also lead to malfunction of relay protection. When the two poles are grounded, it will not only cause refusal and malfunction of the protection device, but also cause a DC short circuit accident in severe cases. [0003] In order to detect the insulation resistance of the positive and negative poles of the DC power supply system to the ground, a balance bridge circuit and a detection bridge circuit ...
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IPC IPC(8): G01R31/12G01R17/10
Inventor 林英王洪信朱锋高鹏薛启成徐天锡于洋李秀兰刘建军孙立新孙鹏王世儒韩旭乔恒侯念国王磊磊李天赵文锦李浩田王龙郭金霞徐丽丽赵彦龙白梓勇于琼张阳季素云岳增伟崔川梁珊珊杨超姜腾谢同平刘琳
Owner STATE GRID SHANDONG ELECTRIC POWER