Instant alternating current invasion prevented insulation monitoring device

An insulation monitoring device and AC intrusion technology, which is applied in the direction of measuring devices, measuring electricity, and fault locations, can solve the problems of long response time for AC intrusion faults, lack of AC intrusion fault measurement and alarm functions, etc., and achieve The effect of shortening troubleshooting time, improving construction safety, and preventing the expansion of accidents

Pending Publication Date: 2017-06-13
SUQIAN POWER SUPPLY COMPANY OF JIANGSU PROVINCE POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The insulation monitoring devices of most manufacturers still do not have the function of measuring and alarming AC intr

Method used

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  • Instant alternating current invasion prevented insulation monitoring device
  • Instant alternating current invasion prevented insulation monitoring device
  • Instant alternating current invasion prevented insulation monitoring device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0038] Refer to attached figure 1 , an insulation monitoring device for preventing instantaneous AC intrusion, including a host, a line selection device, and a DC leakage current sensor.

[0039] The host includes a CPU data processing module, a data acquisition module, a balanced bridge, an unbalanced bridge circuit module, a power supply module, a display module, an alarm module, and a communication module;

[0040] The DC leakage current sensor is clamped to each DC feeder, the power is provided by the line selection device, and the leakage current generated by the faulty branch is converted into a DC voltage and uploaded to the line selection device;

[0041] The host detects the bus voltage of the DC system and the positive and negative bus voltages to ground in real time through the data acquisition module, and displays them in real time through the display module. When an insulation ground fault occurs in the system, the positive and negative voltages of the DC system t...

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PUM

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Abstract

The invention relates to insulation monitoring of a direct current system, and particularly relates to an instant alternating current invasion prevented insulation monitoring device. The device comprises a host, a wire selection device and a direct current leakage current sensor, wherein the host comprises a CPU data processing module, a data collection module, a balance bridge and unbalanced bridge circuit module, a power supply module, a display module, an alarm module and a communication module; the CPU data processing module is connected with the data collection module; the data collection module comprises a multi-channel collection electronic switch, an operational amplifier and a high-precision AD chip, and is used for collecting positive and negative earth grounded voltage of a direct current bus and voltage of the direct current bus in real time; the balanced bridge and unbalanced bridge circuit module comprises a group of balanced bridge resistor and a detection bridge resistor; the display module and the alarm module are connected with the CPU data processing module; and the wire selection device is connected with the CPU data processing module and the direct current leakage current sensor.

Description

technical field [0001] The invention relates to insulation monitoring of a DC system, in particular to an insulation monitoring device for preventing instantaneous AC intrusion. Background technique [0002] The safe and reliable operation of DC power supply is very important for the safe and reliable operation of substations. However, due to the large number of DC power supply devices and long power supply cables, faults such as DC grounding often occur in actual operation. Although the DC system runs floating, the single-point grounding does not affect the normal operation of the system, but the fault must be found and eliminated as soon as possible, otherwise, when the second point grounding occurs, the relay or protection device will malfunction and cause serious consequences. At present, DC system insulation and line selection devices are widely used in substations, which have achieved good results. [0003] In actual operation, there is a special ground fault that is...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R31/08G01R31/02
CPCG01R31/085G01R31/12
Inventor 万新强赖勇王秀茹韩瑞戴超凡李华葛蕾陈莹
Owner SUQIAN POWER SUPPLY COMPANY OF JIANGSU PROVINCE POWER
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