• 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 must be measured as close to the protection relay as possible.
The primary injection test verifies the VT ratio and the wiring all the way from
the primary system to the protection relay. 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.
7.2.4 Checking binary input and output circuits
7.2.4.1 Checking binary input circuits
• Preferably, disconnect the binary input connector from the binary input cards.
• Check all the connected signals so that both the input level and the polarity are in
accordance with the protection relay specifications.
Do not use AC voltage. Binary inputs are rated for DC voltage only.
7.2.4.2 Checking 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 protection relay specifications.
7.3 Authorizations
7.3.1 User authorization
The user categories have been predefined for the LHMI and WHMI, each with
different rights and default passwords.
Passwords are settable for user accounts in all roles. Only the following characters
are accepted.
• Numbers 0-9
• Letters a-z, A-Z
• Space
• Special characters !"#%&'()*+´-./:;<=>?@[\]^_`{|}~
By default, the password policies in the protection relay are as follows:
1MRS759118 D
Commissioning
REX640
Operation Manual
113
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