Electric Operating Mechanism
- Model
- 电动机构
- Standard
- —
- Category
- Operating Mechanism
- Documents & pricing
- Type test reports, factory inspection records and quotations are available on request; tender documents are archived by project.
Product Overview
The electric operating mechanism is used together with overhead contact system (OCS) disconnectors. Driven by an electric motor, it performs local or remote electric opening and closing and supports remote-control operation.
Applied Standards
The design of this product complies with GB/T 32580.2-2026 "Railway Applications - Fixed Installations - High-Voltage AC Switchgear and Instrument Transformers - Part 2: Disconnectors, Earthing Switches and Load Switches", Clause 6.32 (requirements for mechanical drive systems) and Clause 6.35 (specific requirements for motorized operating mechanisms of OCS disconnectors).
Technical Parameters
| Parameter | Technical Requirement (GB/T 32580.2-2026, Clause 6.35) |
|---|---|
| Applicable object | OCS disconnector |
| Operation mode | Electric (local/remote dual mode) |
| Motor power supply | DC power supply |
| Maximum instantaneous starting current | ≤10 A |
| Surge protective device | Shall be provided in the power supply circuit; lightning impulse discharge current ≥60 kA (8/20μs), residual voltage ≤2.5 kV |
| Opening/closing operation time | ≤4 s (closing and opening) |
| Remote/local transfer | A remote/local transfer switch shall be provided; in the local position manual operation applies and remote electric operation is disabled |
| Components inside the enclosure | Motor, limit switches, auxiliary contacts, etc. (excluding relays, contactors and circuit breakers); a heating and dehumidifying device may be provided |
| Limit switch breaking capacity | DC breaking capacity ≥10 A; breaks the motor power supply circuit after closing/opening is completed |
| Earthing terminal | The enclosure shall provide an earthing terminal marked with the protective earth symbol; the secondary earth bar inside shall be installed insulated from the mechanism enclosure |
| Enclosure material | Stainless steel (recommended) |
| Degree of protection | Not lower than IP55W (GB/T 4208-2017) |
| Protection requirements | Protection against cold, moisture, heat, dust, condensation and ingress of foreign objects; the door and the enclosure shall have a locking and anti-loosening mechanism; the roof shall prevent water accumulation |
| Manual crank handle | A manual crank handle for opening and closing shall be provided inside the enclosure |
| Position indication | The opening signal shall be issued only after 100% of the contact gap distance is reached; the closing signal shall be issued at a position where the rated current and the dynamic and thermal stability current can be carried safely |
| Drive connection | The output shaft and the main drive shaft are connected by stepless adjustment; the mechanical connection is firm and reliable |
| Overload protection | An overload protection device that reliably cuts off the motor power supply shall be installed in the operating mechanism |
| Bearing housing structure | Fully sealed construction without an "oil filling hole" |
| Drive connecting parts | Universal joint bearing (with dust-proof structure) + self-lubricating bushings; pins made of anti-rust material |
| Drive linkage | Fabricated connecting structure meeting the requirements for mechanical strength, rigidity and corrosion resistance |
| Water accumulation protection | No water accumulation shall occur on any component or on the enclosure (especially at drive connections and moving parts) |
Structural Features
- DC motor drive with a maximum instantaneous starting current ≤10A and surge protection
- Opening and closing operation time ≤4s, fast and reliable
- Remote/local dual mode; electric operation is disabled in the local position, ensuring maintenance safety
- Fully sealed bearing housing + universal joint transmission, maintenance-free without oiling
- Stainless steel enclosure with IP55W protection, suitable for tunnels and outdoor environments
- Manual opening/closing crank handle inside the enclosure for emergency operation during power failure
- Reliable position indication signals; the opening signal is issued only when 100% of the contact gap distance is reached
Scope of Application
Suitable for electric operation of 27.5kV / 2×27.5kV disconnectors on electrified railway overhead contact systems.
Note: The above values are the requirements specified by GB/T 32580.2-2026. Parameters of specific products such as motor power, operating torque and mechanical endurance class are subject to the product manual and the factory test report, which are available on request.