Phase sequence test method and device for three-phase asynchronous motor in nuclear power plant

Abstract

The invention discloses a phase sequence testing method and device of a three-phase asynchronous motor of a nuclear power station.The device comprises a direct-current power supply and a detection unit, wherein a positive pole of the direct-current power supply is electrically connected with the external connecting end of a first phase stator winding, a negative pole of the direct-current power supply is electrically connected with the external connecting end of a second phase stator winding and the external connecting end of a third phase stator winding, and the detection unit is electrically connected with the external connecting end of the second phase stator winding or the third phase stator winding.The phase sequence testing device is used for testing a three-phase asynchronous motor rotor rotating in a magnetic field, the change trend of output current or potential of the external connecting end of the second phase stator winding or the third phase stator winding is measured, and a phase sequence of the three-phase asynchronous motor is judged according to a preset phase sequence judgment rule.The device is simple in structure and low in manufacturing cost and can be arranged in a large-scale mode, and the costs are further saved.The phase sequence of the three-phase asynchronous motor can be directly tested under the situation that the three-phase asynchronous motor is not connected with a three-phase alternating-current supply and is not energized, testing operations are simple and convenient, and testing results are accurate and efficient.

Description

technical field [0001] The invention relates to the technical field of motor phase sequence testing, in particular to a phase sequence testing method and device for a three-phase asynchronous motor in a nuclear power plant. Background technique [0002] Three-phase asynchronous motor is a type of motor powered by simultaneous access to 380V three-phase AC power supply (phase difference 120 degrees), and has been widely used in nuclear power plants. Among them, according to the different safety levels, it can be divided into three-phase asynchronous motors of safety level (that is, 1E level), such as: complete reactor emergency shutdown, containment isolation, emergency cooling of the core, export of reactor waste heat, heat export of the reactor building, And a three-phase asynchronous motor that prevents the discharge of radioactive substances to the surrounding environment; and a non-safety level (ie NNS level or NC level) three-phase asynchronous motor. [0003] The rota...

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Problems solved by technology

[0005] The invention aims at the low efficiency of the existing three-phase asynchronous motor phase sequence test method and the high cost pressure caused by the motor phase sequence protector in order to ensure the correct steering of the three-phase asynchronous motor, and provides a nuclear power plant three-phase asynchronous motor phase sequence Test method and apparatus

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