ABB UniGear ZS1 Instruction Manual

89
Figure 137
18
19
18
Figure 138
Figure 139 Figure 140
Reaching mechanical life limit
The mechanical life of the earthing switch is set at 2000 opening/closing operations. After the operation
counter has reached this number, inform ABB who will verify directly that the mechanical life limit of
the earthing switch has been reached.
Note
The operation counter is not provided with the switchgear. It is up to the engineering department to
connect the auxiliary closed/open contacts in order to measure the number of operations carried out.
7.3.2.5 Instrument transformers
7.3.2.5.1 Cleaning and checking of the current transformers
• Make the plant you want to work on safe (follow the plant safety regulations);
• Make sure that the circuit-breaker is in the open position;
· Rack the circuit-breaker out from the service position to the test/isolated position;
· Remove the circuit-breaker from the panel;
· Manually close the earthing switch;
· Open the cable compartment door;
· Remove the circuit-breaker plate 27 (figure 140) to get larger access;
· Visually check the connections of the current transformers;
· Using a dynamometric spanner, check the tightness of all the screws. Refer to the table on page 87
for the tightening values.

ABB UniGear ZS1 Specifications

General

Rated Voltage	up to 24 kV
Rated Current	up to 4000 A
Frequency	50/60 Hz
Rated Short-Circuit Breaking Current	up to 50 kA
Rated Peak Withstand Current	up to 125 kA
Insulation	Air-insulated
Type of Switchgear	Metal-clad
Rated Short-time Withstand Current	up to 50 kA for 3s
Internal Arc Classification	IAC AFLR
Protection Degree	IP4X
Busbar System	Single and double busbar
Type Tested Assembly	IEC 62271-200
Dimensions	Varies depending on configuration
Weight	Varies depending on configuration