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Insulation resistance detection and ground protection device of DC electric system

An insulation resistance and electrical system technology, applied in the field of detection and protection devices, can solve problems such as the lack of effective selective protection DC system one-point grounding protection technology, and achieve convenient production debugging, reliable selectivity and accuracy, and simplified circuit design. and the effect of structure

Active Publication Date: 2014-04-02
平湖市四通电源厂
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical engineering applications, apart from expensive off-line ground fault detection instruments, there is no DC system point ground protection technology with effective selective protection

Method used

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  • Insulation resistance detection and ground protection device of DC electric system
  • Insulation resistance detection and ground protection device of DC electric system
  • Insulation resistance detection and ground protection device of DC electric system

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A DC electrical system insulation resistance detection and grounding protection device, including a detection signal source module 1, a plurality of signal couplers 2, a current-absorbing transformer 3, a plurality of residual current sensors 4, a plurality of phase-sensitive rectifiers 5, and a plurality of insulation resistance A detector 6, a plurality of protection output units 7 and a DC blocking capacitor 8;

[0039] The neutral point of the detection signal source module 1 is connected to the main winding of the current-absorbing transformer 3, and the secondary winding of the current-absorbing transformer 3 is connected to the positive and negative main bus bars 9 of the DC electrical system through a DC blocking capacitor 8;

[0040] The three-phase output terminal of the detection signal source module 1 is connected to the detection signal bus 10 for transmitting the detection signal generated by the detection signal source module 1 to the detection signal bus ...

Embodiment 2

[0053] Embodiment 2 differs from Embodiment 1 in that: the detection signal source module 1 includes a first single-chip microcomputer 1.1-1, a filter amplifier circuit 1.1-2 and a power unit 1.1-3. The output end of the PWM module in the first single-chip microcomputer 1.1-1 is connected to the power unit 1.1-3 through the filter amplifier circuit 1.1-2.

[0054] The phase-sensitive rectifier 5, the insulation resistance detector 6 and the protection output unit 7 are all implemented by the internal program of the second single-chip microcomputer 5.1-1. The output terminals of each of the residual current sensors 4 are respectively input to an analog input interface of the second single-chip microcomputer 5.1-1 via a low-pass filter. After the second single-chip microcomputer 5.1-1 performs phase-sensitive rectification filtering, vector multiplication and division operations through the internal program, the output interface of the second single-chip microcomputer 5.1-1 is c...

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Abstract

The invention relates to an insulation resistance detection and ground protection device of a DC electric system. The insulation resistance detection and ground protection device comprises a detection signal source module, a plurality of signal couplers, a booster transformer, a plurality of residual current sensors, a plurality of phase-sensitive rectifiers, a plurality of insulation resistance detectors, a plurality of protection output units and blocking capacitors, wherein the detection signal source module is connected to the signal couplers through detection signal buses; the detection signal source module is connected to the positive and negative main buses of the DC electric system through the booster transformer; the residual current sensors are connected to the input ends of the phase-sensitive rectifiers, the control ends of the phase-sensitive rectifiers are connected to the detection signal buses, the phase-sensitive rectifiers are connected to the insulation resistance detectors and the protection output units, and the insulation resistance detectors and the protection output units are respectively connected to the detection signal buses. The insulation resistance detection and ground protection device has reliable selectivity and accuracy for insulation reduction and ground faults in a protection domain.

Description

technical field [0001] The invention relates to a detection and protection device used in electrical engineering, in particular to a DC electrical system insulation resistance detection and grounding protection device. Background technique [0002] It is known that the ground insulation resistance of the DC electrical system decreases so that a ground fault occurs, and its fault point detection method has always been one of the problems explored by the industry. In practical engineering applications, apart from expensive off-line ground fault detection instruments, there is no DC system point ground protection technology with effective selective protection. The contribution of the present invention is that, by implementing the technology and equipment of the present invention, real-time on-line detection of the ground insulation resistance of the protected circuit of the DC electrical system can be carried out, and the ground fault that occurs can be protected in time, so th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/33G01R27/02
Inventor 武书龙
Owner 平湖市四通电源厂
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