Px2xx/EN SS/A11 Technical Guide
SAFETY SECTION
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2. INSTALLATION, COMMISSIONING AND MAINTENANCE
Connection of the MiCOM relay
The personnel in charge of the installation, commissioning and maintenance of a
MiCOM relay must apply adequate procedures to guarantee safety when using the
equipment. Before installation, commissioning or maintenance on the equipment,
consult the relevant chapters in the technical documentation of the relay.
The terminal blocks of the relays may have a dangerously high voltage during
installation, commissioning or maintenance, if electrical isolation is not carried out.
Access to the connectors at the rear of the relays can present risks of electrocution
and thermal shock.
Before you consider energisation, the MiCOM relay must be connected to earth via
the terminal provided for this purpose.
Unless otherwise indicated in the technical data chapter of the product
documentation, the minimum size recommended for the earth wire is 2.5 mm2.
Before energising your MiCOM relay, please check the following points:
Rated voltage and polarity of the auxiliary power supply
Current value of the current transformer circuit and integrity of the connections
Integrity of the earth connection.
3. OPERATING CONDITIONS OF THE MiCOM RELAY
The operation of the MiCOM relay must comply with the electrical and environmental
requirements described in this document.
3.1 Replacement of the batteries
The internal batteries, if used, must be replaced by batteries corresponding to the
type recommended. They must be installed with the correct polarity, to avoid any risk
of damage to the equipment.
3.2 Current transformer circuits
Never open the auxiliary circuit of a live current transformer. The high voltage
produced may cause serious physical injury and damage the insulation of the
equipment.
3.3 Dielectric withstand test
Following an insulation test, the capacitors may still be charged with a potentially
dangerous voltage. At the end of each part of the test, the voltage must be
progressively brought down to zero to discharge the capacitors before disconnecting
the test wiring.
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