Identifying Relay Application Problems; Inspecting Wiring; Sample Data Interruptions - ABB RELION REX640 Operation Manual

Section 6
Troubleshooting
6.3.4
6.3.4.1
6.3.4.2
94
User accounts can be created under any default roles (VIEWER, OPERATOR,
ENGINEER and ADMINISTRATOR) or additional roles (INSTALLER, SECADM,
SECAUD and RBACMNT). Only Administrator can create user accounts and update
the roles-to-rights mapping. Administrator needs to share the default password
generated for the user account by the tool with the users and recommend the user to
change the password.
1. In IED Users or on the LHMI, change the password of the user account.
2. Log in as administrator to reset the users' passwords.
For more information on user management, see Cyber Security Deployment
Guideline.
If the administrator password is lost, contact ABB's technical
customer support to retrieve the administrator level access.

Identifying relay application problems

• Check that the function is on.
• Check the blocking.
• Check the mode.
• Check the measurement value.
• Check the connection to trip and disturbance recorder functions.
• Check the channel settings.

Inspecting wiring

The physical inspection of wiring connections often reveals the wrong connection for
phase currents or voltages. However, even though the phase current or voltage
connections to protection relay terminals might be correct, wrong polarity of one or
more measurement transformers can cause problems.
• Check the current or voltage measurements and their phase information from
Measurements page/Phasors.
• Check that the phase information and phase shift between phases is correct.
• Correct the wiring if needed.
• Check the actual state of the connected binary inputs from Main menu/Testing
and Commisioning/View I/O.
• Test and change the output states manually in Main menu/Test and
Commissioning/Force Outputs.

Sample data interruptions

Occasionally protection relays can receive corrupted or faulty measurement data
during runtime. In these cases the operation system halts the corresponding
1MRS759118 A
REX640
Operation Manual