Maintenance; General; Intervals For Inspection, Servicing And Repairs - ABB UniGear ZS1 Instruction Manual

7. Maintenance

7.1 General

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Maintenance serves to preserve trouble-free operation and achieve the longest possible working life
of the switchgear. It comprises the following closely related activities:
Inspection: Determination of the actual condition
Servicing: Measures to preserve the specified condition
Repair: Measures to restore the specified condition
Note
When carrying out all maintenance work, the regulations in the country of installation must be strictly
complied with.
Maintenance work may only be performed in a careful manner by trained personnel familiar with the
characteristics of the individual switchgear, in accordance with all relevant IEC safety regulations and
those of other technical authorities, and with other overriding instructions. It is recommended that ABB
service personnel be called in to perform the servicing and repair work detailed below.
The inspection and servicing intervals for some of the equipment/components (e.g. parts subjects to
wear) are determined by fixed criteria, such as switching frequency, length of service and number of
short-circuit breaking operations. On the other hand, for other parts the length of the intervals may
depend, for example, on the different modes of operation in individual cases, the degree of loading,
and also environmental influences (including pollution and aggressive air).
The following operating instructions must also be followed, together with this instruction manual in the
individual cases concerned:
" Vacuum circuit-breaker: type VD4;
" Vacuum circuit-breaker: type VD4 - high current;
" Vacuum circuit-breaker with magnetic actuator: type VM1;
" Gas circuit-breaker: type V-max;
" Gas circuit-breaker: type HD4;
" Vacuum contactor: type V-contact;
" Switch-disconnector NAL - catalogue;
" Switch-disconnector - installation, service and maintenance instruction manual;
" Operating mechanisms of the circuit-breakers with high voltage - catalogue;
" Motor operator UEMC 40 K3 - installation, service and maintenance instruction manual (for units
with NALFE earthing switch).
If necessary, further details can be taken from the technical documentation for the switchgear
installation (including, for example, any special operating conditions agreed on).

7.1.1 Intervals for inspection, servicing and repairs

Time intervals for maintenance work to be carried out always depend on the operating conditions of
the switchgear, and mainly on the mode of operation, the number of rated and short-circuit current
switching operations, ambient temperature, pollution etc. We recommend carrying out the mainte-
nance work at the following intervals:
Activity performed
Inspection
Servicing
Repair
¹) In more demanding service conditions, we recommend reducing this interval suitably – also see sections 1 and 2.
²) According to the results of the inspection.
³) See the instruction manuals of the circuit-breakers.
*) Earthing switch.
According to section Time interval in years
7.2
7.3
7.4
According to number
of switching operations
4 1)
4 2)
As required
10 000 3)
As required