IG-315-EN version 01; 27/04/2021
16
Maintenance
General instructions
transforma
.hvd: Special distribution transformers,
series 52 and 72.5 kV
6. Maintenance
Risk of death by electric shock or irreversible
damage to the machine or to the electrical
installation.
• Before handling the installation, exactly follow the
instructions of Section 6.1 of this general instructions
document.
• Do not operate the tap changer with electrical power
applied to the special distribution transformer.
6.1. Access for maintenance operations
Before performing any maintenance operation on the
special distribution transformer, follow the measures
required by applicable legislation, including:
1.
Disconnect all the electrical power sources for the
Medium Voltage (MV) circuit and the Low Voltage
(LV) circuit, if applicable, until the special distribution
transformer is turned off . Interlock or block the
necessary switching devices to prevent the power
supply.
2.
Check that electrical voltage is not present.
3.
Earth and short-circuit all the electrical power sources.
4.
Using an insulating stick, earth the special distribution
transformer bushings and ensure that any static
electricity is discharged.
5.
Delimit and mark the work area properly.
Risk of causing irreversible damage to the machine
or to the electrical installation.
• Contact
Ormazabal
in the event of dielectric liquid
leaks.
6.
Check that the transformer does not leak dielectric
liquid
Summary of Contents for transforma.hvd
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