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Adaptive line section leakage protection system and method for three-phase non-reliability grounding system

A technology of leakage protection and grounding system, which is applied in the direction of automatically disconnected emergency protection device, emergency protection circuit device, and measuring power, which can solve problems such as leakage protection failure and achieve the effect of precise line selection

Active Publication Date: 2017-11-17
宁波市德侨电子科技有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to provide a three-phase non-reliable grounding system adaptive line selection leakage protection system and method, which solves the problem that the leakage protection based on power direction detection fails when the grid system structure changes

Method used

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  • Adaptive line section leakage protection system and method for three-phase non-reliability grounding system
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  • Adaptive line section leakage protection system and method for three-phase non-reliability grounding system

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Embodiment Construction

[0038] A specific embodiment will be described in detail below in conjunction with the accompanying drawings.

[0039] Such as figure 1 and figure 2 As shown, the present invention provides a three-phase non-reliable grounding system adaptive line selection leakage protection system, including a leakage protection unit based on power direction detection (the leakage protection unit is an existing mature technology, so it will not be described here) and an automatic Adapt feature acquisition unit.

[0040] The adaptive feature acquisition unit is used for leakage simulation to capture leakage characteristics, and adapts the circuit parameters to the leakage protection unit to ensure accurate line selection of the leakage protection unit. The self-adaptive feature acquisition unit includes a feature acquisition primary circuit, a control unit and a PC. Such as figure 1 The circuit diagram of the primary circuit for feature acquisition is used to simulate leakage faults to c...

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Abstract

The invention relates to an adaptive line section leakage protection system and method for a three-phase non-reliability grounding system. On the basis of a power direction detection-based leakage protection unit, an adaptive characteristic collection unit is added; and when a power grid structure is changed, leakage characteristic parameters are captured through the adaptive characteristic collection unit and circuit parameters are adjusted to adapt the leakage protection unit, so that the problem of power direction detection-based leakage protection failure when the power grid system structure is changed can be solved.

Description

technical field [0001] The invention relates to the field of leakage protection, in particular to an adaptive line selection leakage protection system and method for a three-phase non-reliable grounding system. Background technique [0002] The three-phase unreliable grounding system is mostly used in industrial and mining enterprises. These units have high requirements for power reliability, and generally the production environment of these enterprises is complex, and there are more or less flammable and explosive gases or various dusts. Necessary safety measures should be taken for leakage faults that may generate sparks or endanger the lives of personnel. Once a leakage fault occurs, the faulty branch should be cut off in time to prevent the fault from expanding. Current leakage detection methods used in three-phase unreliable grounding systems include: additional DC method, zero-sequence voltage method, zero-sequence power direction method, etc. Among them, if the leaka...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/00H02H3/32G01R31/02G01R19/00
CPCG01R19/00G01R31/58H02H3/006H02H3/32
Inventor 秦海鹏
Owner 宁波市德侨电子科技有限公司
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