Coal-mine downhole automatic-switching power-supply circuit
The utility model discloses a coal-mine downhole automatic-switching power-supply circuit, and solves a problem that the switching of conventional downhole double power supplies is liable to cause misoperation. The circuit provided by the utility model is characterized in that a frequently-used thre...
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Main Authors | , , , , , , , , , |
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Format | Patent |
Language | Chinese English |
Published |
26.03.2014
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Subjects | |
Online Access | Get full text |
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Summary: | The utility model discloses a coal-mine downhole automatic-switching power-supply circuit, and solves a problem that the switching of conventional downhole double power supplies is liable to cause misoperation. The circuit provided by the utility model is characterized in that a frequently-used three-phase power supply(1) is electrically connected with a load (8) through a main contactor; a three-phase standby power supply (10) is electrically connected with the load (8) through a standby contactor; a coil (2) of a relay connected in parallel between the C and A phases of the frequently-used three-phase power supply (1); a normally-opened auxiliary contact (3) of the relay, a normally-closed contact (4) of the standby contactor and a coil (5) of the main contactor are in series connection and then connected in parallel between the B and C phases of the frequently-used three-phase power supply (1); and a normally-closed auxiliary contact (11) of the relay, a normally-closed contact (12) of the main contactor a |
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Bibliography: | Application Number: CN201320512017U |