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  • GW-27.5 Series Outdoor HV Disconnector
Special Switchgear For Rail Traction

GW-27.5 Series Outdoor HV Disconnector

GW-27.5 series outdoor HV disconnector is suitable for AC 50Hz electrified railway system. It can...

  • Product Introduction
  • Product Features
  • Technical Parameters

Product Introduction

GW-27.5 series outdoor HV disconnector is suitable for AC 50Hz electrified railway system. It can not only switch for 27.5kV railway catenary HV circuits or substations without current, but also provide electrical isolation between the HV electrical equipment such as HV busbar and circuit breaker under maintenance and live HV circuits. The product is made up of metal base, insulating post and conductive parts. It is divided into two kind of structures, namely vertical opening and horizontal opening. This disconnector can be fitted with the earthing switch. It has two types: earthing switch with earthing knife-switch and that without earthing knife-switch.

The double-pole disconnector consists of two sets of single-pole earthing switches. The two sets of switches are synchronously opened and closed through a connecting rod.


Product Features

It adopts the external pressure contact structure, and its surface is hard silver plated to improve the conductive reliability.

The fixed soft connection is adopted between terminals to carry current. The upper and lower ends of the terminal block are provided with insulating sleeves to ensure reliable flow and flexible rotation. The terminal block integrates with the outlet post, which reduces a possible heating point.

The bearing pedestal is fully-sealed to prevent rainwater and dust from corroding its rotating bearings. Lubricating grease coated on the bearing surface works under the temperature between -40℃and 120℃ to ensure that no lubrication failure occurs in extremely hot or cold regions.

All transmission shaft pins are made of stainless steel; the rotating parts uses Igus engineering plastic bearing imported from Germany to replace the brass shaft sleeve; the drive parts adopt stainless steel joint bearing to stop the revolving shaft from getting rusty and ensure flexible rotation for a long time.


Technical Parameters

No. Item Unit Parameter
1 Rated Voltage kV 27.5 2×27.5
2 Rated Frequency Hz 50
3 Rated Current A 1250 2500
4 Resistance of Main Circuit μΩ ≤200 ≤150
5 Temperature Rise Test Current A 1.1-fold Rated Current
6 Rated Power Frequency Withstand Voltage (1min) To Earth kV 95 95
Fracture 118 118
Phase to Phase
140
Rated Lightning Impulse Withstand Voltage(peak)(1.2∕50ms) To Earth kV 185 185
Fracture 215 215
Phase to Phase
325
7 Rated Short-time Withstand Current & Duration Disconnector kA/s 31.5/4
Earthing Switch 31.5/4
8 Rated Peak Withstand Current kA 80
9 Mechanical Stability Times 10000
10 Short-time Power Frequency Withstand Voltage of Auxiliary and Control Circuit kV 2
11 Static Mechanical Load of Terminals Horizontal Portrait N 800
Horizontal Landscape 500
Vertical 750
12 Post Insulator Creepage Distance mm ≥1255
Dry Arcing Distance 400
Height 550