Property Specification

Type: High-Voltage Outdoor Horizontal V-Type Center-Break Disconnector / Isolating Switch (up to 145 kV)

Features: Designed as a compact and highly dependable outdoor switchgear asset for ratings up to 145 kV, this disconnector features a ‘V’-configured post-insulator layout with two movable insulator columns per phase. This arrangement substantially minimizes the overall structure base footprint while simplifying mechanical movement. It offers high operational flexibility and can be outfitted with built-in earthing switches on either one or both sides of the isolating mechanism, making it an optimal choice for installations where real estate is at a premium.

Applications: Footprint-constrained utility substations, pole-top or overhead tower mounting arrangements, mobile and temporary trailer-mounted substations, and outdoor high-voltage switchyards requiring compact isolation equipment.

Description

Key Technical Performance Specifications

Technical Parameter / Specification	Unit	126 kV	145 kV
Rated Maximum Voltage	kV	126	145
Continuous Operational Current	A	$\le 2000$	$\le 2000$
Peak Dynamic Withstand Current (Main Disconnector & Ground Switch)	$\text{kA}_{\text{peak}}$	115	115
Short-Time Thermal Withstand Current ( $3\text{ s}$ – Main & Ground Switch)	$\text{kA}_{\text{rms}}$	44	44
Power-Frequency Withstand Voltage ( $50\text{ Hz, } 1\text{ min}$ ): Phase-to-Ground & Inter-Phase	$\text{kV}_{\text{rms}}$	230	275 (wet) 335 (dry)
Power-Frequency Withstand Voltage ( $50\text{ Hz, } 1\text{ min}$ ): Across Open Isolating Gap	$\text{kV}_{\text{rms}}$	230 (+73)	369
Lightning Impulse Withstand Voltage ( $1.2/50\ \mu\text{s}$ ): Phase-to-Ground & Inter-Phase	kV	550	650
Lightning Impulse Withstand Voltage ( $1.2/50\ \mu\text{s}$ ): Across Open Isolating Gap	kV	550 (+103)	750
Main Current Path Resistance	μῼ	120	120