A three-phase alternating current phase sequence protector and protection method for a traction elevator
A technology of phase sequence protector and three-phase alternating current, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of circuit protection, misjudgment of phase sequence protector, failure of circuit shutdown, etc., and achieve the effect of accurate detection
Inactive Publication Date: 2018-12-04
NANJING INST OF RAILWAY TECH
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Problems solved by technology
However, the phase sequence protector in the prior art sometimes misjudges the situation, causing the circuit to be shut down suddenly or unable to protect the circuit
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[0015] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The implementations are only some of the implementations of the present application, not all of them. Based on the implementation manners in this application, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.
[0016] The implementation mode of this application provides a three-phase AC phase sequence protector for traction elevators, please refer to figure 1 , the traction elevator is powered by the A-phase power line 13, the B-phase power line and the C-phase power line through the main power switch 12, and the phase ...
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The invention provides a traction elevator three-phase AC phase sequence protector and protection method. The phase sequence protector comprises a three-phase transformer, an amplitude information acquisition assembly, and a microprocessor. The three-phase transformer comprises a first transformer, a second transformer and a third transformer. The amplitude information acquisition assembly comprises a first acquisition assembly, a second acquisition assembly, and a third acquisition assembly which have the same structure. Each acquisition assembly comprises an amplitude degree regulator and an amplitude direction discriminator connected in parallel. The amplitude information acquisition assembly is connected with the microprocessor via an external bus. The acquisition assemblies are connected with the external bus via signal lines. The traction elevator three-phase AC phase sequence protector and protection method may accurately detect the phase sequence in a traction elevator circuit and may timely protect the circuit when a phase sequence is changed.
Description
technical field [0001] The invention relates to the technical field of automation control, in particular to a three-phase alternating current phase sequence protector and a protection method for a traction elevator. Background technique [0002] The three-phase circuits in a normal power supply system use red, green, and yellow colors to indicate the relative order of the three phases of the three AC power lines of the power supply system at 50 Hz. In the AC traction elevator system, in order to ensure the safety of operation and prevent accidents caused by the reverse rotation of the wrong phase motor, it is not allowed to change the phase sequence between the three-phase power supply lines of the elevator due to wiring reasons. Connect the phase sequence protection component to prevent the phase sequence from changing. Existing phase sequence protectors usually set normally open and normally closed contacts, and when the phase sequence changes, the normally open or normal...
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IPC IPC(8): H02H7/097
CPCH02H7/097
Inventor 王欣
Owner NANJING INST OF RAILWAY TECH