CT14-35KV spring operating mechanism, operating mechanism for 35KV SF6 high-voltage circuit breakers

The CT14 operating mechanism is a spring operating mechanism used for 35kV high-voltage circuit breakers such as the LW8-35 type SF6 circuit breaker, and is widely used in the control and protection of power transmission and distribution systems. According to public information (as of March 2026), its core information is as follows:

Specially designed for operating LW8-35 type outdoor high-voltage SF6 circuit breakers.

Suitable for 35kV power transmission and distribution systems, meeting the requirements of GB1984 "AC High Voltage Circuit Breakers" and IEC standards.

Energy storage method: Electric + manual (two options available).

Energy storage motor:

Dual AC and DC motor;

Rated voltage: -220V, ~220V (common);

Rated current: approximately 4–7A;

Working voltage range: 85%–110% of the rated voltage;

Energy storage time: ≤15 seconds (at rated voltage).

Manual energy storage:

Using a Φ20×700mm handle;

Operating force <375N (approximately 38kgf).

Output characteristics:

Output shaft working angle: 57°–60°;

Closing energy: 1000J.

Auxiliary switch: F10-II/W2 type, 8 normally open + 8 normally closed contacts, long-term current carrying capacity ≥10A.

Service life: 6000 operations.

Weight: approximately 140–141kg.

Overall dimensions: 525×707×425 mm (width × height × depth).

Clamp plate structure, floor-standing installation.

Energy storage system: Adopts a ratchet-drive plate-eccentric wheel mechanism, matched with a closing spring.

Closing holding and tripping: Adopts a roller-cylindrical lock bolt + half-shaft mechanism.

Closing transmission: Cam-four-bar linkage mechanism.

Mechanical interlock: Cannot close again when in the closing position, preventing misoperation.

Auto-reclosing: Supports one-time auto-reclosing of "split - 0.3s - close".

Altitude: ≤2000m (some materials state ≤2500m or 4000m for plateau models);

Ambient temperature: -30℃ to +40℃;

Wind speed: ≤35m/s;

No explosion, corrosion, severe vibration or severe filth (the filth grade is generally Grade III).

Common faults and maintenance key points Typical faults:

Energy storage motor fails to start or has insufficient energy storage;

Closing/tripping coil burns out or gets stuck;

Poor contact of auxiliary switch;

Mechanical seizure (such as abnormal engagement clearance of the half-shaft).

Maintenance suggestions:

Regular lubrication inspection (once every six months for transmission parts);

Conduct electrical and mechanical characteristic tests combined with pre-test every year;

Check whether the heater, limit switch and interlocking device are working properly