High voltage disconnect switch suppliers 252kV

Name: High voltage disconnect switch suppliers 252kV
Brand: Wenzhou Rockwill Electric Co., Ltd.
SKU: 1090
Price: 24600.00 USD
Availability: InStock

Wenzhou Rockwill Electric Co., Ltd.

17yrs 700++ staff 108000+m² US$150000000+ China

Attributes Description Documentation Resource Library Supplier

Key attributes

Brand	ROCKWILL
Series	RDS
Rated voltage	252kV
Rated short-time withstand current	50/63kA
Rated current	2000-4000A
Rated frequency	50 / 60Hz

Description

The RDS series outdoor disconnector is rated for 252 kV and is designed for three-phase AC transmission systems with nominal voltages of 220 kV, 230 kV, 245 kV, and 252 kV. It provides visible isolation for equipment maintenance and performs no-load line switching and bus-transfer current switching.

The disconnector uses a two-column horizontal center-break structure. The conductive blade is driven by the rotating insulator post and opens at the center, forming a clear visible isolating gap. The main circuit resistance is minimized through silver-plated contacts and an optimized current path.

The disconnector is operated by a motor mechanism with three-pole linkage. The earthing switch is installed on one or both sides as required and is manually operated with three-pole synchronization.

Key Features

Single-voltage optimized design：Engineered specifically for the 252 kV class, with insulation coordination and mechanical ratings sized precisely for 220 kV through 252 kV nominal networks, eliminating over-engineering found in multi-voltage platform designs
Global voltage compatibility：One product design covers multiple nominal system voltages including 220 kV (Europe, Asia, South America), 230 kV (North America), 245 kV (IEC standard), and 252 kV (China, Middle East), reducing qualification and inventory complexity for EPC contractors and utilities operating across multiple regions
Center-break mechanism with reduced operating torque：Rotating insulator drive system with sealed bearings and self-lubricating joints minimizes the operating force required, allowing a compact motor mechanism and reducing mechanical stress on the supporting structure
Silver-plated multi-point contact system：Main contacts are silver-plated with multiple parallel current paths, keeping contact resistance stable below 120 µΩ throughout the 10,000-operation mechanical life without intermediate maintenance
Flexible earthing switch arrangement ：The earthing switch can be installed on the left, right, or both sides of each phase, with independent manual operation per phase or synchronized three-pole linkage via connecting rods, adapting to different substation earthing schemes
Compact phase spacing：Optimized phase-to-phase distance reduces switchyard width for 252 kV substations, making it suitable for brownfield expansions where existing bay spacing is constrained

Technical Parameters

Item	Unit	252 kV
Rated voltage (Um)	kV	252
Rated frequency	Hz	50 / 60
Rated current	A	2,000, 3,150, 4,000
Rated short-time withstand current	kA	50 / 63
Rated short-circuit withstand duration	s	3
Rated peak withstand current	kA peak	125 / 160
Rated power-frequency withstand voltage (1 min), phase to earth	kV	460
Rated power-frequency withstand voltage (1 min), across isolating distance	kV	460 + 145
Rated lightning impulse withstand voltage, phase to earth	kV peak	1,050
Rated lightning impulse withstand voltage, across isolating distance	kV peak	1,050 + 200
Mechanical endurance	operations	10,000
Terminal static load (longitudinal / transverse / vertical)	N	2,500 / 1,500 / 1,250
Bus-transfer current switching capability	A / V	1,600 / 100
Creepage distance	mm	6,300 / 7,812
Operating altitude	m	≤ 2,000
Pollution level per IEC 60815	class	IV (very heavy)
Radio interference voltage (RIV)	µV	≤ 500

Operating Mechanism

Item	252 kV
Disconnector mechanism	Motor (three-pole linkage)
Earthing switch mechanism	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	12 s ± 1 s

Application Scenarios

220 kV / 230 kV transmission substations：Line and busbar isolation in networks using IEEE or IEC nominal voltages
245 kV / 252 kV regional grid substations ：Primary isolation equipment in national transmission grids
Cross-border interconnection projects：Single product qualified for 220 kV to 252 kV range eliminates separate qualification for each nominal voltage
Substation brownfield expansion；Standard phase spacing compatible with existing 252 kV switchgear layouts
EPC transmission projects : Unified supply for multi-country projects with different nominal voltage standards

Order Information

When ordering, specify:

Product model and rated voltage
Nominal system voltage (220, 230, 245, or 252 kV)
Rated current and rated short-time withstand current
Earthing switch configuration (none, left, right, or both sides)
Arrangement form (right-angle or parallel)
Upper busbar type (soft or hard) and tubular busbar outer diameter
Motor voltage and control voltage
Number of auxiliary switch contacts
Installation method
Altitude and pollution level (if different from standard)

Documentation Resource Library High voltage disconnect switch

Restricted

12 to 550kV Center Side Break Disconnect Switch Installation and Instruction Manuals 12 to 550kV Center Side Break Disconnect Switch Installation and Instruction Manuals

Installation Manual

English

PDF

Public

Rockwill Electric Group Profile Rockwill Electric Group Profile

Brochure

English

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Frequently asked questions

How do these 550kV disconnectors (Siemens, Hitachi, GE, and XD Group) perform in terms of key electrical parameters such as rated voltage, rated current, and withstand current?

Basic Electrical Parameters

Rated Voltage: All four models from Siemens, Hitachi Energy, GE, and Pinggao are rated for 550 kV.
Rated Current: The Siemens, Hitachi, and Pinggao models are rated for 4000A. The GE PKG Gen3-550 offers a higher rated current of 5000A, making it suitable for applications with higher power flow requirements.
Short-Circuit Withstand: All models demonstrate identical performance, with a short-time withstand current of 63 kA for 3 seconds.
Peak Withstand Current: All models share the same peak withstand current rating of 171 kA.

Why are 330kV/345kV/400kV not classified as universal standard voltages?

330kV is used in some regions of China, 345kV is common in North American power grids, and 400kV is mostly customized for cross-border projects or special industrial scenarios. They have not been incorporated into the global unified universal standard system.

Know your supplier

ROCKWILL

Wenzhou Rockwill Electric Co., Ltd.
17yrs 500-1000 108000+m² US$150000000+ China

Online store

On-time delivery rate

Response time

100.0%

≤4h

Company overview

Workplace: 108000m² Total staff: 700+ Highest Annual Export(usD): 150000000

Services

Business Type: Design/Manufacture/Sales

Main Categories: Medium and High Voltage Switchgear/Power and Distribution Transformers/Instrument Transformers and Sensors/Lightning Protection and Electrical Insulation/Substations and E-Houses/Electrical Panel and Controlgear

$24600.00

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12 to 550kV Center Side Break Disconnect Switch Installation and Instruction Manuals

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Whole-life care management services for equipment procurement, use, maintenance, and after-sales, ensuring safe operation of electrical equipment, continuous control, and worry-free electricity consumption.

The equipment supplier has passed platform qualification certification and technical evaluation, ensuring compliance, professionalism, and reliability from the source.