17.3 Earthing Switch
Warning : In the case of work on high-voltage equipment, there is danger to life if the applicable safety
rules are not observed and complied with.
The safety rules also include the five safety rules according to DIN/VDE 0105 Part 1
The five safety rules according to DIN/VDE
1. Disconnection
2. Safeguard against reconnection
3. Establish potential isolation
4. Earth and short-circuit
5. Cover or partition off adjacent live parts
Note : The following operations must be carried out at each inspection interval.
Operating steps :
1. Observe safety rules for work on high-voltage equipment and take suitable measurement
(including the five safety rules according to DIN/VDE)
2. Switch off electrical power supplies and control voltages and safeguard against reconnection
3. Clean ( ) Figure 6 ; Figure 69,
Figure 70; check for erosion in area of silver layer > 0.5 mm and, if necessary, replace
4. Grease earthing contact (18) and contact fingers (20)
5. Check for damage to earthing connections between earthing switch and disconnector base and,
if necessary, replace
6. Check maintenance-free rod ends and supporting points of all operating linkages and coupling
rods
7. Check all bolt connections for security
8. Carry out some test operations manually (our recommendation : Three test operations)
9. Reconnect electrical power supplies and control voltages
10. Carry out some test operations using the motor-operated mechanism (our recommendation :
Three test operations)
11. The maintenance of the operating mechanism for the earthing switch should be carried out
according to the maintenance instructions separately supplied for the operating mechanism
earthing contacts 18 7 Figure 68 and contact fingers (20) AA
84/113
1HDB 050016-YN-A
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