| Brand | ROCKWILL |
| Series | RDS |
| Rated voltage | 550kV |
| Rated current | 3150A-5000A |
| Rated short-time withstand current | 63kA |
| Rated frequency | 50/60Hz |
The RDS series outdoor disconnector is rated for 550 kV and designed for three-phase AC extra-high-voltage transmission systems. It provides visible isolation for equipment maintenance, performs no-load line switching, and handles bus-transfer current switching in EHV substations.
The disconnector uses a heavy-duty horizontal center-break structure with two insulator columns per phase. Corona control rings are fitted at the contact and terminal ends to suppress corona discharge and limit radio interference. The conductive blade and contact system are designed to maintain a uniform electric field distribution, keeping RIV below 500 µV at the rated voltage.
The SRCJ2 motor actuator provides single-pole operation with three-pole linkage capability. The earthing switch is installed on one or both sides and is manually operated with three-pole synchronization.
EHV corona control design：Corona grading rings at blade tips, contact ends, and terminal connectors suppress electric field stress, limiting RIV to ≤500 µV and preventing audible corona noise, meeting EHV substation environmental requirements
Heavy-duty center-break structure：Reinforced insulator columns and blade assembly sized for 550 kV class loads, with 5,000 N longitudinal terminal load capacity matching heavy strain bus and overhead line connections in EHV yards
Controlled opening speed：Motor actuator opening time of 18 s provides a controlled separation speed that minimizes mechanical shock while ensuring reliable arc extinction at the auxiliary arcing contacts during no-load switching
Integrated switching impulse withstand：Meeting the Range II insulation coordination requirements specific to 550 kV EHV systems where switching surges dominate over lightning
Large creepage distance options：Standard creepage oavailable, accommodating heavy salt-fog and industrial pollution common in coastal EHV substation environments
Single-pole operational flexibility ：Independent SRCJ2 actuator per phase allows phase-selective isolation, enabling maintenance on one phase while the remaining two phases remain energized with reduced system capacity
| Item | Unit | 550 kV |
|---|---|---|
| Rated voltage (Um) | kV | 550 |
| Rated frequency | Hz | 50 / 60 |
| Rated current | A | 3,150, 4,000,5000 |
| Rated short-time withstand current | kA | 63 |
| Rated short-circuit withstand duration | s | 3 |
| Rated peak withstand current | kA peak | 160 |
| Rated power-frequency withstand voltage (1 min), phase to earth | kV | 620 |
| Rated power-frequency withstand voltage (1 min), across isolating distance | kV | 620 + 315 |
| Rated lightning impulse withstand voltage, phase to earth | kV peak | 1,550 |
| Rated lightning impulse withstand voltage, across isolating distance | kV peak | 1,550 + 445 |
| Rated switching impulse withstand voltage, phase to earth | kV peak | 1,175 |
| Rated switching impulse withstand voltage, across isolating distance | kV peak | 1,175 + 315 |
| Mechanical endurance | operations | 10,000 |
| Terminal static load (longitudinal / transverse / vertical) | N | 5,000 / 2,500 / 2,000 |
| Bus-transfer current switching capability | A / V | 2,400 / 435 |
| Creepage distance | mm | 13,750 / 17,050 |
| Operating altitude | m | ≤ 2,000 |
| Pollution level per IEC 60815 | class | IV (very heavy) |
| Radio interference voltage (RIV) | μV | ≤ 500 |
| Item | 550 kV |
|---|---|
| Disconnector actuator | SRCJ2 motor (single-pole, three-pole linkage supported) |
| Earthing switch actuator | Manual (three-pole linkage) |
| Motor voltage | AC 380 V / DC 220 V |
| Control voltage | AC 220 V / DC 220 V / DC 110 V |
| Opening / closing time | 18 s ±1 s |
550 kV EHV transmission substations：Busbar, line, and circuit breaker isolation in 500 kV and 550 kV class transmission grids
Coastal EHV substations：High creepage and corona-controlled design suited for salt-fog and high-humidity coastal environments
Long-distance bulk power transmission：Line disconnector at 550 kV overhead line terminals in inter-regional and cross-border transmission corridors
EHV substation expansion：Single-pole operation allows phased outage during substation brownfield extension without full bay shutdown
Industrial EHV take-off stations：Isolation for large industrial loads connected directly to 550 kV transmission networks
When ordering, specify:
Product model and rated voltage
Rated current and rated short-time withstand current
Creepage distance requirement
Corona ring configuration (standard or enhanced)
Earthing switch configuration (none, left, right, or both sides)
Arrangement form (right-angle or parallel)
Upper busbar type (tubular or strain) and terminal connector type
Motor voltage and control voltage
Number of auxiliary switch contacts
Installation method
Altitude and pollution level (if different from standard)
The RDS‑series outdoor high‑voltage disconnector adopts heavy‑duty horizontal center‑break structure with two insulator columns per phase.
Corona control rings are equipped on contacts and terminals to restrain corona discharge and radio interference, and its RIV can be kept below 500 µV under rated voltage with uniform electric‑field distribution.
The RDS‑series outdoor high‑voltage disconnector adopts SRCJ2 motor actuator, supporting single‑pole operation and three‑pole linkage function.
The earthing switch can be arranged on one side or both sides, which is manually operated with three‑pole synchronization.
The RDS‑series outdoor high‑voltage disconnector features a 5000 N longitudinal terminal load capacity to accommodate heavy‑duty busbars and overhead leads.
Its controlled 18‑second opening speed mitigates mechanical shock and guarantees reliable arc extinction for the auxiliary arcing contacts. Its insulation performance satisfies Range‑II insulation‑coordination requirements for 550 kV systems where switching surges constitute the dominant stress.
Login
