High voltage disconnect switch OEM Manufacturer-800kV 1100kV

Attributes Description Documentation Resource Library

Key attributes

Brand	ROCKWILL
Series	RDS
Rated voltage	800kV/1000kV
Rated current	5000A
Rated short-time withstand current	63kA
Rated frequency	50 / 60Hz

Description

The Rockwill RDS series outdoor ultra-high voltage (UHV) disconnector is rated for 800 kV and 1000 kV, designed for three-phase AC UHV transmission systems. It provides visible isolation for equipment maintenance, performs no-load line switching, and handles bus-transfer current switching in UHV substations. The disconnector is suitable for 750 kV, 800 kV, and 1000 kV nominal system voltages.

The disconnector adopts a heavy-duty horizontal center-break structure with two insulator columns per phase, reinforced for UHV-class mechanical and electrical loads. Corona grading rings are fitted at the blade tips, contact ends, and terminal connectors to suppress corona discharge, control radio interference, and prevent audible corona noise. The conductive blade and contact system maintain a uniform electric field distribution, keeping RIV below 500 µV at 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 available with manual or motor operation

Key Features

UHV corona control design：Multi-stage corona grading rings at blade tips, contact ends, and terminal connectors suppress electric field stress, effectively limiting radio interference voltage and preventing audible corona noise at rated voltage
Heavy-duty center-break structure：Reinforced insulator columns and blade assembly sized for UHV class mechanical loads, providing high longitudinal terminal load capacity matching heavy strain bus and overhead line connections in UHV yards
Controlled opening speed ：Motor actuator provides 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：SI withstand voltage values per IEC 60071-1 Range II, where switching surges dominate over lightning for UHV insulation coordination
Large creepage distance options：Standard and heavy-duty creepage distances available, accommodating heavy salt-fog and industrial pollution in coastal and desert UHV substation environments
Single-pole operational flexibility：Independent actuator per phase allows phase-selective isolation, enabling maintenance on one phase while remaining phases remain energized
IEC 62271-102 compliant：Fully type-tested in accordance with IEC 62271-102 for disconnectors and earthing switches, covering bus-transfer, inductive, and capacitive switching

Technical Parameters

Item	Unit	800 kV	1000 kV
Rated voltage (Um)	kV	800	1000
Rated frequency	Hz	50 / 60	50 / 60
Rated current	A	5,000	5,000
Rated short-time withstand current	kA	63	63
Rated short-circuit withstand duration	s	3	3
Rated peak withstand current	kA peak	160	160
Rated power-frequency withstand voltage (1 min), phase to earth	kV	830	960
Rated power-frequency withstand voltage (1 min), across isolating distance	kV	830 + 460	960 + 520
Rated lightning impulse withstand voltage, phase to earth	kV peak	1,950	2,250
Rated lightning impulse withstand voltage, across isolating distance	kV peak	1,950 + 650	2,250 + 750
Rated switching impulse withstand voltage, phase to earth	kV peak	1,425	1,550
Rated switching impulse withstand voltage, across isolating distance	kV peak	1,425 + 460	1,550 + 520
Mechanical endurance	operations	10,000	10,000
Terminal static load (longitudinal / transverse / vertical)	N	5,000 / 3,000 / 2,000	5,000 / 3,000 / 2,000
Bus-transfer current switching capability	A / V	2,400 / 435	2,400 / 435
Creepage distance	mm	21,600 / 27,200	27,500 / 34,000
Operating altitude	m	≤ 1,000	≤ 1,000
Pollution level per IEC 60815	class	IV (very heavy)	IV (very heavy)
Radio interference voltage (RIV)	µV	≤ 500	≤ 500

Insulation levels per IEC 60071-1 for Range II UHV equipment.

Operating Mechanism

Item	800 kV	1000 kV
Disconnector actuator	SRCJ2 motor (single-pole, three-pole linkage supported)	SRCJ2 motor (single-pole, three-pole linkage supported)
Earthing switch actuator	SRCJ2 motor or manual	SRCJ2 motor or manual
Motor voltage	AC 380 V / DC 220 V	AC 380 V / DC 220 V
Control voltage	AC 220 V / DC 220 V / DC 110 V	AC 220 V / DC 220 V / DC 110 V
Opening / closing time	18 s ± 1 s	20 s ± 1 s

Application Scenarios

800 kV UHV transmission substations ：Busbar, line, and circuit breaker isolation in 750 kV and 800 kV class transmission grids (China, Brazil, India)
1000 kV UHV transmission substations：Line disconnector at 1000 kV overhead line terminals in long-distance bulk power transmission corridors
UHV substation brownfield expansion：Single-pole operation allows phased outage during substation extension without full bay shutdown
Desert and coastal EHV/UHV substations：High creepage and corona-controlled design suited for salt-fog, sand, and high-temperature environments

Order Information

When ordering, specify:

Product model and rated 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 and mounting structure height
Altitude and pollution level (if different from standard)
Any special environmental requirements (seismic, wind load, ice load)

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FAQ for disconnect switch

What practical engineering benefits does single‑pole operation bring to the Rockwill RDS‑series outdoor high‑voltage disconnector?

Each phase of the Rockwill RDS‑series outdoor high‑voltage disconnector is driven by an independent actuator to realize phase‑selective isolation.

Operators can carry out maintenance work on one single phase, while the other two phases can remain energized, which avoids full bay shutdown and improves the availability of UHV transmission systems.

Which standard does the Rockwill RDS‑series outdoor high‑voltage disconnector comply with, and what test items are covered?

The Rockwill RDS‑series outdoor high‑voltage disconnector is fully type‑tested and complies with IEC 62271‑102 for disconnectors and earthing switches.

The type‑test covers bus‑transfer switching, inductive switching and capacitive switching performance requirements.

What key performance advantages does the Rockwill RDS‑series outdoor high‑voltage disconnector possess for UHV substation application?

The Rockwill RDS‑series outdoor high‑voltage disconnector features controlled opening speed to reduce mechanical shock and guarantee reliable arc extinction of auxiliary arcing contacts during no‑load switching.

Its switching impulse withstand performance complies with IEC 60071‑1 Range‑II, which applies to UHV systems where switching surges are the dominant insulation stress. Multiple creepage distance options are available to cope with salt‑fog, coastal and desert heavy‑pollution environments.

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