Monitoring device and method for direct-current resistance of electromagnet
A technology for monitoring devices and electromagnets, applied in measuring devices, measuring magnetic properties, measuring resistance/reactance/impedance, etc., can solve the problems of bearing bush wear and burning, reduce the probability of failure, facilitate implementation, and reduce charging time Effect
Pending Publication Date: 2020-12-22
JIANGSU NUCLEAR POWER CORP
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Problems solved by technology
[0005] The purpose of the present invention is to design a direct resistance monitoring device of an electromagnet and its monitoring method, which is used to solve the problem of bearing bush damage caused by starting and stopping the main pump when the electromagnet fails because there is no monitoring means during the hot standby period of the electromagnet in the prior art. Technical problems of wearing out or even burning out
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[0058] Below in conjunction with accompanying drawing and embodiment the present invention is further introduced:
[0059] This patent is a direct resistance monitoring device for electromagnets. The device is divided into primary circuit I and secondary circuit II, which are respectively connected to the primary circuit and secondary circuit of the electromagnet switch, such as Figure 1-2 In the middle dotted frame, use the main contactor K1 of the electromagnet switch and the time relay T1 to control the input or exit of the direct resistance monitoring device.
[0060] The main contactor K1 of the electromagnet switch controls the electrification or de-energization of the time relay T1. The contact capacity of T1 is small and the number of contacts is small, so the intermediate relay K13 is added. The intermediate relay K13 is used to increase the contact capacity and expand the number of contacts.
[0061] The direct resistance monitoring device of the electromagnet of th...
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The invention belongs to the technical field of electrical maintenance of nuclear power stations, and particularly relates to a monitoring device and method for direct-current resistance of an electromagnet. The monitoring device comprises a direct-current resistance monitoring device primary loop I, a direct-current resistance monitoring device secondary loop II, an electromagnet switch primary loop, an electromagnet switch secondary loop, an electromagnet switch remote control loop and a plurality of wires, wherein the direct-current resistance monitoring device primary loop I is connected into the electromagnet switch primary loop through one wire, and the direct-current resistance monitoring device secondary loop II is connected into the electromagnet switch secondary loop through onewire; and the electromagnet switch remote control loop is connected to the electromagnet switch secondary loop through a switching-on and switching-off command relay contact.
Description
technical field [0001] The invention belongs to the technical field of nuclear power plant electrical maintenance, and in particular relates to an electromagnet direct resistance monitoring device and a monitoring method thereof. Background technique [0002] In a nuclear power plant, Units 1 and 2 are designed with 4 reactor main coolant pumps (hereinafter referred to as main pumps) in the primary circuit of each unit. The bearings of the main pumps are lubricated with water, and each main pump is designed with an electromagnet. The function of the electromagnet is to start the main pump when the pressure of the primary circuit exceeds 7MPa or cut off the main pump when the pressure of the primary circuit exceeds 13MPa, relying on the force of the electromagnet (direction downward), reduce the axial force acting on the rotor. force, to ensure the establishment of radial-thrust bearing lubricating water film, so that the motor can overcome the frictional moment on the rotor....
Claims
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IPC IPC(8): G01R33/12G01R27/02
CPCG01R27/02G01R33/1253
Inventor 李洪伟徐霞军郭莉侠王雄辉石岩王亚东王镜琪吴东方翁铖忠司旭东徐广建张志国
Owner JIANGSU NUCLEAR POWER CORP