Method and apparatus of single-phase fault line selection of duplicate supply looped network

A single-phase ground fault, single-phase grounding technology, applied in the direction of circuit devices, fault locations, emergency protection circuit devices, etc., to achieve the effect of accurate fault line selection and outstanding special problems

Active Publication Date: 2007-08-08
泰安市鲁兴电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of this application is to solve the problem of line selection for single-phase ground faults in dual power supply networks or ring distribution networks. Single-phase ground fault line selection method and device in dual power supply network or closed-loop ring distribution network

Method used

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  • Method and apparatus of single-phase fault line selection of duplicate supply looped network
  • Method and apparatus of single-phase fault line selection of duplicate supply looped network
  • Method and apparatus of single-phase fault line selection of duplicate supply looped network

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Embodiment Construction

[0027] Now with Fig. 1, Fig. 2, Fig. 3 illustrate an embodiment of the present application.

[0028] This embodiment is mainly used to monitor the single-phase grounding fault of the incoming power line, and the core device is a timing discriminator VC1 dedicated to the ring network.

[0029] The "universal single-phase grounding line selection module for feeder lines" and peripheral circuits in Figure 1 are the same as the "single-phase grounding line selection module" in the patent ZL200520080013.0 resonant grounding system single-phase grounding line selection device, and the wiring method is similar No more details.

[0030] In Fig. 1, it also includes a ring network single-phase grounding line selection module (as shown in Fig. 2 ), and a small transformer ST. u 0 After the step-down of the transformer ST, the output line is connected to the CZ1 socket of the single-phase grounding line selection module of the ring network, and the zero-sequence current transformer seco...

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Abstract

The invention discloses one double power ring net earth connection fault selection method, which adopts zero sequence current rules for earth connection fault selection. The invention also discloses one double power earth connection selection device, which comprises feedback out wires selection module and its circle circuit and which is characterized by the following: comprising single phase earth connection module and outer circuit; the selection module is composed of time sequence identification, parent zero sequence signal circuit, two paths of power line zero current signal circuits, two paths of power entrance U and W load current signals and output circuit.

Description

technical field [0001] The invention belongs to a power system fault detection and relay protection device, in particular to a detection method and a selective protection device for a single-phase grounding fault of a medium-voltage double power supply ring power supply network. technical background [0002] On June 10, 2002, the applicant applied for a utility model patent "Single-phase grounding line selection device for small current grounding system" (Patent No. ZL02237567.8) based on the "zero-sequence current (fundamental wave) timing identification rule" invented by the applicant. And the invention patent "Single-phase grounding line selection method and device for small current grounding system" (public number CN1453916), and applied for a utility model patent "Single-phase grounding line selection device for resonant grounding system" on January 14, 2005 (patent number ZL200520080013 .0). The above-mentioned patent is mainly composed of a single-phase ground line s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/32G01R31/08
Inventor 傅桂兴付英
Owner 泰安市鲁兴电子科技有限公司
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