JW5/JW8/JW10 (TV70) earthing switch: 40.5-800kV, 630-4000A, lightning impulse 200-2100kV, 3s short-time 20-63kA, making peak 50-165kA. For HV substation earthing protection.
TV70 earthing switch supports single‑pole / three‑group operation with manual crank, swing‑handle or motor drive. Blade moves parallel or perpendicular to base; mechanical & electrical interlock with disconnector is available. It refers to ANSI C37.30.1 Annex D, aligned with relevant IEC earthing‑switch standards for various site‑installation conditions.
It supports single‑pole independent operation or three‑pole group‑operated mode; drive options include manual crank, swing handle and motor operator. The blade can move either parallel or perpendicular to the base.
Mechanical interlock and electrical interlock can be fitted, to prevent simultaneous closing of the line disconnect switch and the earthing switch. Interlock accessories shall be mounted on vertical operating pipe with correct installation sequence.
Installation, adjustment and maintenance must be performed by qualified personnel who are fully trained for high‑voltage transmission & distribution equipment, familiar with relevant safety procedures.
Login
