A detection method and detection device for an elevator power supply failure phase
A detection device and detection method technology, applied in the direction of measuring device, measuring electricity, measuring electrical variables, etc., can solve the problem of high cost, achieve the effects of low power consumption, reduced number of circuit components, and reduced power supply failure rate
Inactive Publication Date: 2018-01-16
TIANJIN HAOYA SCI & TECH DEV
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Problems solved by technology
[0012] In the above technical solution, the number of components used in the detection circuit is relatively large, and the detection circuit is powered by DC low voltage, which needs to be obtained from the elevator power supply through a power conversion device. Compared with the direct use of AC power supply, the cost is higher
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[0032] figure 1 Among them, L1, L2, and L3 are the input terminals of the three-phase power supply for the elevator; J is a small relay, the rated voltage of the pull-in coil is the same as the voltage of the power line, through the moving contact J-1, the moving contact J- 2 Output phase failure information, J pull-in status indicates that there is no phase failure in the three-phase power supply, J release status indicates that one or two phases or three phases of the three-phase power supply have a phase failure failure; OC is an optocoupler, which is a Zero-cross trigger bidirectional thyristor output optocoupler, used for voltage monitoring circuit and relay driving circuit.
[0033] The relay J in the figure uses L1-L3 of the three-phase power supply as the working power supply. One end of the coil of the relay J is connected to L1, and the other end is connected in series with the output bidirectional thyristor of the optocoupler OC and then connected to L3. The workin...
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The invention provides a power supply phase failure detecting method and device for an elevator. The method is that a detecting result is outputted according to the closing and opening state of a relay J; L1-L3 of a three-phase power supply are used as the circuit power supplies, and the power supply circuit has the function of detecting the phase failure of the L1 phase and the L3 phase; the L2 phase is detected through a detecting circuit based on the optocoupler application technology; a rectifier diode D1 and a current limiting resistor R1 are connected in series and then connected to the L2-L3 of the three-phase power supply to form a half-wave rectifier circuit; C1 is a filter capacitor; an input LED of the optocoupler (OC) is connected to the L2-L3 half-wave rectifier circuit through a current limiting current R2; the output two-way controlled silicon of the OC is connected in series with the relay J to control the closing and opening. The detection method is simple and practical; the detecting device employs few circuit elements, so that the cost performance is high.
Description
technical field [0001] The invention relates to a safety protection device for an elevator power supply system, in particular to a detection method and a detection device for a phase failure of the elevator power supply in an elevator control cabinet. Background technique [0002] In view of the fact that the elevator is a special equipment for carrying people, in order to ensure the safety of the elevator, there are high requirements for the protection of the power supply system, and there are strict verification measures. It can be put into use only after passing the inspection by the technical inspection agency. [0003] Relevant national regulations and standards on the safety technical requirements for elevator power failure and wrong phase protection include: [0004] a. The elevator should have the power supply system phase failure and phase error protection function. When the elevator power supply circuit has a phase failure or phase error, the elevator should stop ...
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IPC IPC(8): G01R31/02B66B5/00
Inventor 刘培
Owner TIANJIN HAOYA SCI & TECH DEV