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Locking circuit breaker repeated tripping and closing method for DC traction feeder protection device

A feeder protection and DC traction technology, applied in emergency protection circuit devices, emergency protection devices for automatic disconnection, circuit devices, etc., can solve problems such as damage to circuit breakers and lines, accident expansion, etc., to prevent repeated opening and closing The effects of gate operation, continuity assurance, and fast and accurate restoration of power supply

Active Publication Date: 2020-02-07
南京国电南自轨道交通工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the lock is reset, the device will still start reclosing after another protection trip. If the reason for the failure of closing still exists (such as the mechanical failure of the circuit breaker), the device will be in the "opening command-closing command-opening command "In the cycle, the circuit breaker and the circuit will be damaged, which will lead to the expansion of the accident in severe cases.

Method used

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  • Locking circuit breaker repeated tripping and closing method for DC traction feeder protection device
  • Locking circuit breaker repeated tripping and closing method for DC traction feeder protection device
  • Locking circuit breaker repeated tripping and closing method for DC traction feeder protection device

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Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] figure 1 It is a flow chart for judging the reclosing starting voltage mode of the DC protection measurement and control device in the embodiment of the present invention.

[0024] When the catenary fails, the protection starts the circuit breaker to open. If the device recloses and the line test function is enabled, after the recloser starts, the device judges the line status through the feeder voltage and the bus voltage:

[0025] 1. Check the existing voltage status by detecting the feeder voltage U1 and the bus voltage U2, and compare it with the set reclosing high voltage value UH and the set reclosing low voltage value UL:

[0026] High voltage mode: If both U1 and U2 are greater than UH, reclose directly;

[0027] Low voltage mode: If any voltage of U1 and U2 is greater than UH, while the other voltage is less than UL,...

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Abstract

The invention discloses a method for locking repeated tripping and closing of a circuit breaker for a DC traction feeder protection device, which is characterized by comprising the steps of detectingthe line condition by combining a line detection and reclosing function of the DC traction feeder protection device, locking the closing operation of the device for the circuit breaker if the line condition is unknown or the circuit breaker cannot maintain a closing state within a set time after closing, enabling the device to enter a single locking state, and relieving the single locking state only when the next opening signal is received. The operation for the circuit breaker is locked if the opening signal for relieving the single locking state is detected to reach a set number of times within the set time, and the device enters a double-locking state and does not respond to an opening and closing command. The scheme can effectively avoid damages of multiple repeated opening and closingoperations of the device to the circuit breaker or the protection device.

Description

technical field [0001] The invention relates to the field of rail transit DC traction power supply systems, in particular to a method for repeatedly tripping and closing a locking circuit breaker for a DC traction feeder protection device. Background technique [0002] In the rail transit power supply system, the DC traction feeder protection device shoulders the important mission of ensuring the safe and reliable operation of rail transit. Its main protection functions include current quick break, DLL, overcurrent, overload, traction network overheating, small current grounding, Busbar loss of voltage and other protection, while using automatic reclosing and line testing to realize the rapid recovery of power supply when the line has an instantaneous fault, improving the reliability of the system and the continuity of power supply. At present, domestic research on DC feeder protection is still in the stage of exploration and development. Conventional DC feeder protection wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/00H02H3/06
CPCH02H3/00H02H3/06
Inventor 陈娜娜孙金华秦成虎管金酉
Owner 南京国电南自轨道交通工程有限公司
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