Electrical five prevention content is to prevent the wrong wrong closure, to prevent the load closure, to prevent the charged ground, to prevent the power supply with the ground, to prevent the wrong into the charged.
Prevention of misconnection and misclosure: Prevent misconnection and misclosure of circuit breakers, only the operating instructions corresponding to the operating equipment can be operated on the equipment to be operated.
Preventing load splitting and closing: preventing load splitting and closing of the disconnecting switch, the disconnecting switch cannot be operated in the state of circuit breaker, load switch and contactor closing.
Preventing charged grounding: preventing charged hanging (closing) of the grounding wire (grounding switch), only in the state of circuit breaker opening, can hang the grounding wire or close the grounding switch.
Prevention of power supply with ground: prevent power supply with ground wire, prevent closing the circuit breaker (disconnecting switch) with ground wire (grounding switch).
Prevention of accidental entry into the energized: to prevent accidental entry into the energized compartment, only when the compartment is not energized, the door can be opened to enter the compartment.
Principles to be considered in the design, manufacture and selection of error-proofing devices
(1) the structure of the error-proofing device should be simple, reliable, easy to operate and maintain, and as far as possible, not to increase the complexity of the normal operation and accident handling.
(2) electromagnetic lock should be used gap type principle, lock bolt can be automatically reset.
(3) complete sets of high-voltage switchgear with error-proofing devices, should give priority to mechanical interlocking.
(4) anti-failure device should be a special tool (key) for unlocking.
(5) the error-proof device should meet the operating requirements of the equipment, and corresponding to the operating position of the equipment used.
(6) Anti-failure device should not affect the main technical performance of the switchgear (such as opening and closing time, etc.).
(7) The power supply used in the error-proof device should be separated from the power supply of relay protection and control circuits.
(8) error-proof device should be dust-proof, anti-foreign object, rust-proof, non-jamming. Outdoor error-proof device should also be waterproof, moisture-proof, mold-proof measures.
(9) "five security" in addition to preventing the wrong break, wrongly closed circuit breaker can be used to suggest the device, the other "four security" should be mandatory device.
(10) The new design of outdoor 110kV and above complex junction, should give priority to the use of electrical interlocking or electromagnetic locking program.