ABB UniGear ZS1 - Page 70

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• Preparatory works for SF6 circuit-breakers:
- Clean the insulating parts with clean dry cloth;
- Check that the upper and lower terminals are clean and free of any deformation caused by shocks
received during transport and storage;
- It is advisable to check the SF6 gas pressure;
• Perform AC voltage testing of the main circuits according to IEC 62271-200 where necessary. Pay
special attention to voltage transformers and cables, etc. during this procedure. A testing and
earthing module 142 (figure 129) can be used to make the connections (see section 6.3.2);
• Switch the auxiliary and control voltage on;
• Carry out testing operations on switching devices manually or by electrical control, and simultane-
ously observe the relative position indicators;
• Check mechanical and electrical interlocks for effectiveness, without using force;
• Set the protection devices in the switchgear to the required values and check their function with test
equipment;
• In switchgear panels with an additional ventilation system for high current circuit-breakers (required
for ambient temperature higher than > 40 °C and/or higher frequency - 60Hz -according to section
1.3 and figures 109 and 110), flap 20.3 hanging in partition 20 must rest loosely against leaf spring
20.4 (with the centrifugal fan at a standstill, if fitted ). This is not standard.
To check:
- Insert a suitable screwdriver through opening 20.5 in horizontal partition 20 and into bracket 20.6
on flap 20.3;
- Swing flap 20.3 upwards and allow it to rest loosely again on leaf spring 20.4;
- If the flap is in the locked position, use the screwdriver to press leaf spring 20.4 downwards by
approx. 5 mm to release the lock before swinging the flap;
- If any centrifugal fans controlled in relation to primary current are fitted, also check that these
function correctly;
Figure 109: Fitting of horizontal partition 20 with addi-
tional ventilation ventilation for high current
circuit-breakers, required due to increased
ambient temperature (>40°C) and/or in-
creased frequency (60 Hz) according to
section 1.3. The internal flap is shown in the
service position (open). Side view, but without
the wind vane with micro-switch required with
a fan. Not standard.
20 Horizontal partition, here fitted with the
additional ventilation facilities for the
circuit-breaker
20.3 Flap
20.4 Leaf spring
20.5 Inspection aperture
20.6 Bracket
20.7 Centrifugal fan
Figure 110: Horizontal partition with additional ventilation
facilities. Checking unimpeded movement of
the internal flap 20.3
20.5 Inspection opening