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DC Power System Insulation Monitoring Device Using Eccentric Bridge Technology

A technology of DC power supply system and insulation monitoring device, which is applied in the detection field, can solve problems such as refusal to operate and malfunction, and achieve the effect of increasing frequency, improving reliability, and improving the ability to protect malfunction

Active Publication Date: 2016-04-20
SHENZHEN TIEON ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention adopts unbalanced bridge (eccentric bridge) technology to solve the technical problems in the prior art that one point grounding is likely to cause misoperation and refusal to move

Method used

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  • DC Power System Insulation Monitoring Device Using Eccentric Bridge Technology
  • DC Power System Insulation Monitoring Device Using Eccentric Bridge Technology

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Embodiment Construction

[0009] Specific embodiments of the present invention are described with reference to the above drawings.

[0010] Depend on figure 1 with figure 2 It can be seen from the figure that this DC power system insulation monitoring device 100 is a device for preventing misoperation including a detection unit 10 respectively connected to the positive and negative bus bars of the DC power system. The detection unit 10 includes an unbalanced bridge circuit 11 arranged between the positive and negative bus bars , the unbalanced bridge circuit 11 includes a positive bus-to-ground resistance R1 set between the positive bus M+ and the ground, and a negative bus-to-ground resistance R2 set between the negative bus M- and the ground. The negative bus-to-ground resistance R2 has a resistance value of The resistance value of the positive busbar-to-ground resistor R1 is smaller than the resistance value of the positive busbar-to-ground resistor R1, and the resistance value of the positive bus...

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Abstract

The invention discloses a direct current power system insulation monitoring device employing an eccentric bridge technology. The device comprises a detection unit (10) connected with positive and negative generatrixes of a direct current power system respectively. The detection unit (10) comprises an unbalanced bridge circuit (11) arranged between the positive and negative generatrixes. A single criterion can be used for generatrix insulation judgment, and the unbalance of voltages to ground of the positive and negative generatrixes is not required to be judged; and worry about a one-point grounding failure caused by the unbalance of the voltages to ground of the positive and negative generatrixes when a balance bridge is used for detecting balanced grounding is eliminated, and the capability of maloperation protection caused by reduction in the insulation resistance of the system is improved.

Description

technical field [0001] The invention relates to the detection technology, in particular to the detection equipment of the power supply part of the DC equipment in the power system. Background technique [0002] The DC power supply system is used in hydraulic and thermal power plants, various substations and other users who use DC equipment to provide DC power for signal equipment, protection, automatic devices, emergency lighting, emergency power and circuit breaker opening and closing operations. power supply. The DC power supply system is an independent power supply, which is not affected by the generator, plant power consumption and system operation mode, and is an important device that ensures that the backup power supply-battery continues to provide DC power in the event of an external AC power interruption. The reliability and security of the DC power supply system directly affect the reliability and security of the power supply system. The function of the insulation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02
Inventor 关平刘忠祥
Owner SHENZHEN TIEON ENERGY TECH