Method for determining multipoint earth faults of long stator according to line voltage
A multi-point grounding, long stator technology, applied in fault location, measurement of electricity, measurement of electrical variables, etc., can solve problems such as affecting the safe operation of trains
Inactive Publication Date: 2011-11-23
TONGJI UNIV
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Problems solved by technology
In this case, the faulty stator will generate a fault current to brake the train, causing the train to be subjected to a lateral moment, affecting the safe operation of the train
Method used
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[0019] The method for determining the multi-point ground fault of the long stator according to the line voltage of the present invention is especially suitable for determining the multi-point ground fault of the long stator coil of the induction motor in the traction power supply system of the maglev train.
[0020] Microcomputer relay protection device is widely used at present, and it usually includes analog quantity acquisition module, switch quantity acquisition module, central processing unit, communication module, man-machine interface module and so on.
[0021] Cooperate see figure 1 , figure 2 As shown, first as figure 1 As shown, a relay protection device 1 is installed on the long stator power supply side of the three-phase winding of the protected branch circuit, and its analog quantity acquisition module is respectively connected to the power supply terminals of the three-phase winding through the three-phase voltage transformer 2; the relay protection device 1 ...
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The invention discloses a method for determining multipoint earth faults of a long stator according to a line voltage. A relay protection device which can be used for monitoring a stator three-phase voltage and monitoring whether a stator branch is disconnected with a power supply is arranged at the source side of each branch, and can monitor the three-phase main frequency line voltage and the connection state between the branch and the power supply; and when a larger difference exists between amplitude values of three-phase line voltages in the branch and when the branch is disconnected withthe power supply, the branch is judged to have multipoint earth faults, and an alarm signal is sent out. The method provided by the invention can be used for a high-speed magnetic suspension transportation system, and for rapid judgment can be made according to the three-phase line voltage characteristics in the faulted branch, and then an alarm signal is sent out and a train is controlled to brake even if some branch is disconnected with the power supply due to the fault or when a maglev vehicle runs through the faulted stator coil, thus ensuring the safety in operation.
Description
technical field [0001] The invention relates to a method for determining multi-point grounding faults of a long stator according to line voltages in a traction power supply system of a maglev train. Background technique [0002] The traction power supply system of the maglev track line is generally composed of a radial power grid with section cables, on which there are multiple branches connected, and each branch is connected to one end of the long stator assigned to a certain section of the maglev track line; the long stator Connect the other end to the standard potential. In order to activate a certain section of the maglev track line, the corresponding branch circuit is connected to the section cable through the switch station. [0003] In the event of a ground fault, there is a method to determine the grounding direction on the maglev track line, which will detect the zero voltage derived from the phase voltage applied to the branch on the switch station of the branch t...
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Login to View More IPC IPC(8): G01R31/08G01R31/02
Inventor 金宇方华徐习东杜鹏程王霄桦许铁峰徐涛
Owner TONGJI UNIV