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Middle-high voltage electric power circuit fault detection method and system of unilateral power supply under power failure state

A technology of power lines and unilateral power supply, applied in fault locations, information technology support systems, etc., can solve the problems of low degree of automation and complicated implementation, and achieve the effect of improving the level of automation

Inactive Publication Date: 2013-04-24
朱珂 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This fault detection method requires human operation, complex implementation, and low degree of automation

Method used

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  • Middle-high voltage electric power circuit fault detection method and system of unilateral power supply under power failure state
  • Middle-high voltage electric power circuit fault detection method and system of unilateral power supply under power failure state
  • Middle-high voltage electric power circuit fault detection method and system of unilateral power supply under power failure state

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] When performing fault detection on a 10KV single-side power distribution line in a power failure state, the signal generator can be installed on the low-voltage side of any distribution transformer 7 attached to the 10KV power distribution line, such as image 3As shown, it includes 10KV busbar 11, which is connected to distribution transformer 7 through circuit breaker 10 and 10KV line, the secondary side of distribution transformer 7 is connected to signal generator 1, and signal generator 1 communicates with remote communication equipment; When the 10KV line of the single-side power supply is in a power failure state, the signal generator 1 automatically or under control generates a transient voltage and adds it to the low-voltage line downstream of the 10KV line of the single-side power supply. After the transient voltage is boosted by the distribution transformer 7 on the line Applied on the 10KV line of the single-side power supply, while the fault point that may e...

Embodiment 2

[0033] When performing fault detection on a 35KV single-side power supply line in a power failure state, the signal generator 1 can be installed on any 10KV distribution line downstream of the 35KV line such as image 3 In addition to the low-voltage side of any distribution transformer 7 shown, it can also be installed on the low-voltage side of the transformer used in the substation with the 35KV line as the incoming line, such as Figure 4 shown. Figure 4 , including 35KV busbar 12, which is connected to main transformer 9 through circuit breaker 10 and 35KV line, the secondary side of main transformer 9 is connected to the primary side of transformer 8 used, and the secondary side of transformer 8 used is connected to signal generator 1 . The signal generator 1 communicates with the remote communication equipment; when the 35KV line of the single-side power supply is in a power failure state, the signal generator 1 automatically or under control generates a transient vol...

Embodiment 3

[0035] When performing fault detection on a 110KV single-side power supply line in a power failure state, the signal generator can be installed on any 10KV distribution line downstream of the 110KV line such as image 3 In addition to the low-voltage side of any distribution transformer 7 shown, it can also be installed on the low-voltage side of the transformer used in the substation with the 110KV line as the incoming line, such as Figure 5 shown. Figure 5 Including 110KV busbar 13, which is connected with main transformer 9 through circuit breaker 10 and 110KV line, the secondary side of main transformer 9 is connected with the primary side of transformer 8 used, and the secondary side of transformer 8 used is connected with signal generator 1 . Signal generator 1 communicates with remote communication equipment; when the 110KV line of the single-side power supply is in a power failure state, the signal generator 1 is controlled to generate a transient voltage and add it...

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Abstract

The invention relates to a middle-high voltage electric power circuit fault detection method and system of a unilateral power supply under a power failure state. The middle-high voltage electric power circuit fault detection system comprises a signal generator; the signal generator is arranged on a low-voltage circuit at the downstream of a middle-high voltage electric power circuit in the unilateral power supply; a transformation device is arranged on the low-voltage circuit, and the low-voltage circuit is connected with the low-voltage side of the transformation device; the high-voltage side of the transformation device is connected with the middle-high voltage electric power circuit of the unilateral power supply; meanwhile, the signal generator is also communicated with remote communication equipment; when the middle-high voltage electric power circuit is in the power failure state, the signal generator automatically or controlledly generates a transient voltage which is boosted by the transformation device, and the boosted transient voltage is applied to the middle-high voltage electric power circuit; at the same time that fault point breakdown possibly exists on the middle-high voltage electric power circuit, a transient signal current is generated to flow to the middle-high voltage electric power circuit; whether the middle-high voltage electric power circuit has a fault is judged by detecting and analyzing the transient voltage and the transient signal current generated by the transient voltage; and therefore the fault detection of the middle-high voltage electric power circuit in the unilateral power supply under the power failure state is realized.

Description

technical field [0001] The invention relates to a method for detecting whether there is a fault in a power line in a power outage state, in particular to a method and system for detecting a fault in a high-voltage power line in a single-side power supply in a power outage state. Background technique [0002] Circuit breakers are widely used in power systems as high-voltage switches. The power department can realize the stop and power transmission operation of the downstream load of a single-side power line by tripping and closing the corresponding circuit breaker on the power line. However, when the blackout line has a permanent fault, the closing operation will not only cause an impact on the power system, but also deteriorate the working conditions of the circuit breaker and bring a series of adverse effects to the power system. Therefore, it is of great significance to detect the fault of the power outage line before closing the switch and transmitting power. [0003] S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 朱珂徐文远
Owner 朱珂
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