ABB V-Contact VSC Series User Manual

22
Grounding
A good connection to earth guarantees correct operation of
alltheapparatusinstalled.However,evenearthingcarried
out correctly is not a sufficient measure to ensure a good
connection between the VSC control module and earth. In
fact,sincethecontrolmoduleofthecontactorisconnected
to the metallic base of the VSC by means of a copper
connection(Fig.7),itisalwaysnecessarytocheckthatthe
connection is intact.
Furthermore,earthingmustalwaysbecarriedoutbetweenthe
VSC frame and the main earthing system of the plant.
Use cables with a suitable cross-section and of the minimum
length needed.
Connection of metallic structures to exposed conductive
parts
Inthecaseofpaintedpartsofthesupportingstructure,
the various parts must always be scraped to eliminate the
paint and connected with busbars or copper braids so as to
guarantee low inductance connections.
Tomakealowinductanceearthingconnection,usecables
orbusbarswithanappropriatecross-section,preferably
rectangular. Scrape away the paint of the metallic parts over a
sufficientlylargearea,tightenthefixingscrewsandcoverthe
connected parts with Vaseline grease.
The length of the earthing cables must be as short as
possible. Connection to earth of the parts must guarantee the
same electric potential and low impedance.
Fig. 7 - Grounding
NEPSI.COM - Northeast Power Systems. Inc.

ABB V-Contact VSC Series Specifications

General

Brand	ABB
Model	V-Contact VSC Series
Category	Industrial Electrical
Language	English