Coal-mine downhole automatic-switching power-supply circuit

• Main Authors: LI XIAOHUA, GAO XIAOMING, CAO YANLIN, CHEN LIPING, BAI YONGQING, CHEN RONGHAI, SHAO LILI, ZHAO GAILAN, TANG JISHENG, MA SHUXIAN
• Format: Patent
• Language: Chinese; English
• Published: 26.03.2014
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

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