The isolating switch coδ↔★ntrol wiring and the corresponding circ≤♠uit breaker are locked, w¶‍☆©hich can effectively prevent t•‌∑‌he pull and combine i≈€solation switch with load. Howe✘π→$ver, in the operation oδ•↕∑f the bus-side disconnecting swσ♣>∏itch and the line-side disconnecting ♠ switch, due to human factors, the ope&&™∑ration sequence may be reversed. This®₹ is not allowed by the s¥$ witch and the operation principle ♣≥of the switch, and is aγ₩♣lso one of the causes of the÷→​ accident in the power system ₹. In order to prevent the i©π→ solation switch operation seque↓'nce from being reversed, t €he plant and station that have€​★δ not used the program lock to preve§₩>∏nt mistakes will be improved by  φthe original isolating switch co>♥ntrol wiring, which can prevent misoper¶★αation and reduce unnecessary accide'✔↔©nts.

1.Isolation switch contr♣★ol locking circuit improvement princip‌×le

In the isolation switch control an↕δ>d lockout circuit, the auxiliar✘π±y contact of the isola £tion switch is serially connected, that±∞¶ is, the bus side isolation switch cπ÷$₩ontrols the normally closed§€☆ auxiliary contact of the li←€​Ωne isolation switch in the la↔¶tching loop, and the line sid" e isolation switch control loop is con♥π♣nected to the bus side isol↔™↑ation switch. Open the auxiliary contac•££↔ts.

2. Use the electromagnetic ✘& lock to prevent the error of isol®§'​ation and open and close the lock wir¥≈δ e (take single bus line as ₩↓an example). Figure 1 s±δδ♣hows the original control w↔©πiring. This type of ®↑wiring can effectively α↕prevent pull-out and σ‌ λdisconnect switches wi÷§th load, but it may cause the order of €​operation of the disconnect s∏×witch to be reversed.

Figure 2 Improved Single Bus ≤δ÷♥Feeder Isolation and Closure

See Figure 2 for improved wiring. Pow Ω∏&er failure operation: After the c¥♣ircuit breaker is opened, t ♣→he line side isolation switch can β©÷ only be opened first to open the ♠>βbus side isolation switch.

Power transmission opera≥♠¥$tion: In the open position of the c¶'←∑ircuit breaker, only the busbar side i&☆solation barrier can be closed☆ ‌✔ before the line side≥δ✘ isolation barrier can be closed. This ₽‌type of wiring not only prevents the>÷£π load from pulling a£±>×nd closing the isolation switch↓ε, but also prevents the violation oπ<®f the operating princi↓€✘ples of the switch and the switch. 3. I←₽εmprove the advantages of wiring

(1) The improved wiring not only reλα★Ωtains the advantages of the orig≈σinal isolating switch control w​±≈​iring, the most important is that it §≥€₩can effectively prevent₩₩§÷ the violation of the operating prin₩♠↔ciple of the switch, knifπ≥♠✔e gate operation, and reduce unnecess↕≥‍∞ary accidents.

(2) This improved wiring is₩↕≤↑ simple, reliable, and le×£ss investment. Applicable to th$≤e use of electromagnetic lock anti‍✔-misuse wiring and pneumatic§♦β control, electric operation, ele♠® αctro-hydraulic operation of the ★§γ♦isolation switch control ¶®wiring.

(3) In a device that does not useπ¥  a program lock to prevent m£•↔istakes, it is equivalent tφ☆≤o a program lock.