PRS-7910
44 PRS-7910
10 Commissioning
1.1 General
This relay is fully numerical in their design, implementing all protection and non-protection
functions in software. The relay employs a high degree of self-checking and in the unlikely event of
a failure, will give an alarm. As a result of this, the commissioning test does not need to be as
extensive as with non-numeric electronic or electro-mechanical relays.
To commission numerical relays, it is only necessary to verify that the hardware is functioning
correctly and the application-specific software settings have been applied to the relay.
Blank commissioning test and setting records are provided at the end of this manual for
completion as required.
Before carrying out any work on the equipment, the user should be familiar with the contents of the
safety and technical data sections and the ratings on the equipment's rating label.
10.1 Safety Instructions
NOTICE!
Current transformer secondary circuits MUST be short-circuited BEFORE the current
leads to the device are disconnected.
Only qualified personnel should work on or in the vicinity of this device. The personnel
must be familiar with all safety regulations and service procedures described in this
manual. During operating of electrical device, certain part of the device is under high
voltage. Severe personal injury and significant device damage could result from
improper behavior.
Particular attention must be drawn to the following:
• The earthing screw of the device must be connected solidly to the protective earth conductor
before any other electrical connection is made.
• Hazardous voltages can be present on all circuits and components connected to the supply
voltage or to the measuring and test quantities.
• Hazardous voltages can be present in the device even after disconnection of the supply
voltage (storage capacitors!)
• The limit values stated in the technical data must not be exceeded at all, not even during
testing and commissioning.
• When testing the device with secondary test equipment, make sure that no other
measurement quantities are connected. Take also into consideration that the trip circuits and
maybe also close commands to the circuit breakers and other primary switches are disconnected
from the device unless expressly stated.
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