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Novel faulty line selection method in low current faulty grounding system

A technology of small current grounding and fault line selection, applied in fault location, measurement of electricity, electrical components, etc., can solve the problem of low fault line selection accuracy, and achieve high fault line selection accuracy, reasonable method steps, and operation and application. handy effect

Inactive Publication Date: 2010-05-05
山东泰开自动化有限公司
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Problems solved by technology

[0004] In order to solve the problem of low accuracy of fault line selection in the prior art, the present invention provides a new fault line selection method in a small current grounding system, and the technical solution adopted is:

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  • Novel faulty line selection method in low current faulty grounding system
  • Novel faulty line selection method in low current faulty grounding system
  • Novel faulty line selection method in low current faulty grounding system

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with accompanying drawing and embodiment:

[0025] Applying this fault line selection method first needs to collect the zero-sequence voltage and phase voltage on each section of the bus, as well as the zero-sequence current on all outgoing lines carried by the section of the bus. The collection of the above real-time values ​​is developed by Shandong Taikai Automation Co., Ltd. The FBZ-3200 small current grounding line selection device is completed. The analog signal input from the CT (current transformer) / PT (voltage transformer) of the device enters the AD converter through the filter circuit, and realizes the collection of required analog quantities with a sampling frequency of 24 points per week.

[0026] The fault line selection method includes the following method steps:

[0027] (1) Start-up of fault line selection logic:

[0028] Such as figure 1 As shown, the voltage starting method is ado...

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Abstract

The invention discloses a novel faulty line selection method in a low current faulty grounding system, which judges whether a ground fault happens or not by detecting zero sequence voltage and phase voltage of a system bus, determines to judge grounded fault circuit adopting different faulty line selection methods according to the different characteristics of zero sequence fundamental wave and zero sequence quintuple harmonic current generated according to that arc suppression coil exists in a system when single-phase grounding fault happens on the premise that ground fault occurs, combines with some assistant line selection criteria to perform comprehensive judgment so as to select the circuit with a fault correctly, thus overcoming the problem of low accuracy of faulty line selection in a low current grounding system. The invention has the characteristics of reasonable method steps, high accuracy of faulty line selection and convenient operation and application.

Description

technical field [0001] The invention relates to a fault line selection method in a small current grounded power system, which belongs to the application field of relay protection technology. Background technique [0002] The node where the generators or transformers are star-connected is called the neutral point of the power system. The small current grounding system refers to the operation mode in which the neutral point in the system is not directly grounded. There are two main modes of operation without direct grounding. One of the ways is that the neutral point is not grounded (neutral point insulation); the other way is that the neutral point is grounded through the arc suppression coil or grounded through the resistance (ineffective grounding). The most common fault in low current grounding systems is single-phase grounding. When a single-phase ground fault occurs, the ground current is small, no short-circuit loop is formed, and the supply voltage at this time can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/02H02H7/26
Inventor 宋春晖吴士洪姚继滨郭兆静
Owner 山东泰开自动化有限公司
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