Method for monitoring multipoint grounding failure of magnetic suspension stator coil
A stator coil, multi-point grounding technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as affecting the safe operation of trains
Inactive Publication Date: 2013-07-31
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
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Embodiment Construction
[0021] The method for monitoring the multi-point grounding fault of the maglev stator coil of the present invention is especially suitable for determining the multi-point grounding fault of the stator coil of the induction motor in the traction power supply system of the maglev train.
[0022] 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.
[0023] Cooperate see figure 1 , figure 2 As shown, first as figure 1 As shown, a relay protection device 1 is installed on the power supply side of the protected branch, and the digital input module of the relay protection device 1 is connected to the auxiliary contact of the switch on the power supply side through wires to determine whether the switch is disconnected; The relay protection device 2 is set on the star point side of the road...
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The invention discloses a method for monitoring a multipoint grounding failure of a magnetic suspension stator coil, which comprises the steps of: arranging a relay protection device which can recognize whether a stator branch is disconnected with a power supply and has a communication capacity on a power side switching station on each stator branch; arranging another relay protection device which can monitor a three-phase current and has a communication capacity on a star point side of each stator branch; and when any one phase of current of the branch exceeds a setting value and is in an overcurrent state and the branch is disconnected with the power supply, judging that the branch generates the multipoint grounding failure, and sending an alarm signal. The method disclosed by the invention can be used in a high-speed magnetic suspension traffic system and used for rapidly judging whether the branch generates the multipoint grounding failure by using the induction current generated by a train in a stator even if certain branch is disconnected with the power supply due to the failure and a magnetic suspension train passes through a failed stator coil, sending the alarm signal andcontrolling the brake of the train, and ensures that the train safely runs.
Description
technical field [0001] The invention relates to a monitoring method for determining multi-point grounding faults in induction motor stator coils in a maglev train traction power supply system. 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 to be m...
Claims
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IPC IPC(8): G01R31/06G01R19/165
Inventor 徐习东杜鹏程金宇方华王霄桦许铁峰徐涛
Owner TONGJI UNIV