Test the circuitry. The following tests are recommended:
•
Polarity check
•
VT circuit voltage measurement (primary injection test)
•
Earthing check
•
Phase relationship
•
Insulation resistance check
The polarity check verifies the integrity of circuits and the phase relationships. The
polarity should be measured as close as possible to the IED so ensure that most of the
wiring is also checked.
The primary injection test verifies the VT ratio and the wiring all the way through
from the primary system to the IED. Injection must be performed for each phase-to-
neutral circuit and each phase-to-phase pair. In each case voltages in all phases and
neutral are measured.
8.2.4
Checking binary input and output circuits
8.2.4.1
Binary input circuits
Preferably, disconnect the binary input connector from the binary input cards. Check
all connected signals so that both input level and polarity are in accordance with the
IEDs specifications.
8.2.4.2
Binary output circuits
Preferably, disconnect the binary output connector from the binary output cards.
Check all connected signals so that both load and voltage are in accordance with the
IED specifications.
8.3
Authorizations
8.3.1
User authorization
The user categories have been predefined for LHMI and WHMI, each with different
rights and default passwords.
Passwords are settable. LHMI password must be at least four and WHMI password
at least nine characters. Maximum number of characters is 20 for the WHMI password
and 8 for the LHMI password. Only the following characters are accepted:
1MRS756708 A
Section 8
Commissioning
615 series
91
Operation Manual
