Fault Line Selection Method for Non-Effectively Earthed Neutral Point System
A technology of non-effective grounding and fault line selection, which is applied in the direction of fault location, fault detection according to conductor type, short-circuit test, etc., and can solve problems such as high cost and complicated fault line method
Active Publication Date: 2021-09-10
SIEMENS CHINA
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Problems solved by technology
[0002] In the neutral point non-effectively grounded system, including the main three-phase circuit and several branch three-phase circuits connected to the three-phase circuit, if a single-phase line of a branch three-phase circuit has a ground fault and causes zero-sequence current, the neutral point A non-effectively grounded system will still work for a while, but may cause subsequent problems
[0003] However, the existing method for detecting the fault line of the neutral point non-effectively grounded system is relatively complicated and the cost is high
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[0029] In order to have a clearer understanding of the technical features, purposes and effects of the invention, the specific embodiments of the present invention are now described with reference to the accompanying drawings, in which the same reference numerals represent components with the same or similar structures but the same functions.
[0030] In this article, "schematic" means "serving as an example, example or illustration", and any illustration or implementation described as "schematic" should not be interpreted as a more preferred or more advantageous Technical solutions.
[0031] In order to make the drawing concise, each drawing only schematically shows the parts related to the present invention, and they do not represent the actual structure of the product. In addition, in order to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically shown, or only one of them is mar...
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The invention provides a fault line selection method for a neutral point non-effectively grounded system. Several first circuit breakers with current measurement modules are arranged to several branch three-phase circuits, and each first circuit breaker is connected in series to each branch three-phase circuit. circuit, and measure the zero-sequence current through the current measurement module. The voltage measurement module is arranged to a main three-phase circuit or a branch three-phase circuit. The control device is arranged to obtain zero-sequence current and zero-sequence voltage. The fault line selection method includes: when the zero-sequence voltage obtained by the control device is greater than a preset value, start line selection: make the control device output a synchronization signal to each current measurement module so that each current measurement module measures the zero-sequence current synchronously; the control device compares the measured zero-sequence currents, and if among the measured zero-sequence currents, the maximum magnitude of one zero-sequence current is greater than the maximum magnitude of other zero-sequence currents , then it is judged that the zero-sequence current line is a faulty line; the control device outputs a control signal to the first circuit breaker connected in series with the faulty line to disconnect the faulty line.
Description
technical field [0001] The invention relates to a fault line selection device of a neutral point grounding system, in particular to a fault line selection device of a neutral point non-effective grounding system. Background technique [0002] In the neutral point non-effectively grounded system, including the main three-phase circuit and several branch three-phase circuits connected to the three-phase circuit, if a single-phase line of a branch three-phase circuit has a ground fault and causes zero-sequence current, the neutral point A non-effectively grounded system will still work for a while, but may cause subsequent problems. [0003] However, the existing method for detecting the fault line of the neutral point non-effectively grounded system is relatively complicated and the cost is high. Contents of the invention [0004] The object of the present invention is to provide a fault line selection method for a neutral point non-effectively grounded system, which can ac...
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IPC IPC(8): G01R31/52G01R31/08
CPCG01R31/086G01R31/50
Inventor 闫韬马佳丽闵令宝卓越
Owner SIEMENS CHINA