Electric railway feeder line impedance protecting method based on power supply section differential pressure and leading-phase current
An impedance protection and power supply arm technology, applied in power line components, emergency protection circuit devices, electrical components, etc., can solve the problem of inability to realize short circuit fault protection of the two power supply arms of the traction substation, and achieve the effect of good sensitivity
Active Publication Date: 2010-06-09
BEIJING SIFANG JIBAO AUTOMATION +1
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[0004] In order to solve the problem in the prior art that the feeder protection using the conventional principle cannot realize the short-circuit fault protection of the two power supply arms of the traction substation, the present invention proposes a feeder impedance protection for electric iron based on the differential pressure of the power supply arm and the leading phase current method
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[0019] The technical solutions of the present invention will be described in further detail below according to the accompanying drawings and specific embodiments.
[0020] The role of the traction substation is to convert the 110kV three-phase alternating current into 27.5 (or 55) kv single-phase alternating current, and supply power to the electric traction network and electric locomotives. In addition, a few traction substations also need to bear the 10kv power load in the region . Therefore, the traction substation is a hub for receiving and distributing electric energy and changing the voltage of electric energy, and it is one of the important links between the power plant and the electric locomotive. Traction substation is mainly composed of primary side, transformer and secondary side. The primary side of the traction substation is the power supply side, and the low-voltage side of the transformer is the secondary side. No matter what type of transformer the transformer...
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The invention discloses a protecting method for short circuit fault of supply arms of a traction substation, which adopts the voltage difference of the supply arms and the current of a leading phase to form novel electric railway feeder impedance protection. The novel electric railway feeder impedance protection adopts improved quadrilateral characteristics, and a parallelogram which is based on an R-axis can play the role of protecting when short circuit fault occurs among supply arms and can ensure that any ground fault of the supply arms does not act on an activity area. The impedance protection provided by the invention only needs the voltage of the supply arms and the current of the leading phase and can be easily realized in already running or newly-built traction substation. The method is theoretically not affected by inrush current, load conditions, fault types, initial phrase angle when in fault, system impedance and transition resistance. The test result shows that the principle has great sensitivity, selectivity and rapidity.
Description
technical field [0001] The invention belongs to the technical field of electrified railway power supply systems, and particularly relates to a protection method when two power supply arms are short-circuited. Background technique [0002] At present, the development of my country's high-speed railway has entered a rapid development channel, and the reliability requirements of the electrified power supply system have become more and more important. Accurate and fast fault identification and tripping are beneficial to eliminate the development of accidents, thus providing a guarantee for the rapid restoration of power supply. [0003] The split-phase insulator where the traction substation is located generally has a neutral zone of 18-30m. If the electric locomotive driver drops the bow to pass the split-phase according to the operating rules when the train passes through the split-phase, there will be no short circuit between the power supply arms. of. However, when the dri...
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IPC IPC(8): B60M1/02H02H7/26
Inventor 肖远清杨卉卉刘志超秦应力张志强
Owner BEIJING SIFANG JIBAO AUTOMATION