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4 Problems with the Device
4.4 Protection and Control
4.4
Protection and Control
Description
After first start-up of the protective device there is a
pending trip.
The switchgears cannot be operated by SCADA
communication.
Problem with current and voltage measurement.
The trip command is kept in latched state.
Relay outputs do not react.
18
Information
Two red LEDs are illuminated at the front of the
HMI. They indicate a trip and an alarm.
The measured values of current and voltage
show a big fluctuation.
A latched trip command has been reconfigured
from latched to unlatched.
The contacts of the outputs do not open or close.
This can be checked by simulating a fault and
checking the output contacts with measurement
equipment.
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Corrective Action
With the factory default settings the protection relay is
configured with an undervoltage protection. Adapt the
settings of the undervoltage protection or remove this
module from the device project settings (if you do not
need it). If you have any problems with acknowledging
the pending alarm, please refer to
"The binary outputs or
LEDs are in unexpected
state".
Set the [Control / General Settings] »Switching
Authority« of the device to either "Remote" or "Local and
Remote".
Adjust [System Para / General Settings] »f« to the
connected grid frequency (50 Hz or 60 Hz).
Only until Release 3.5: The status of the trip command
must be acknowledged once, if it had already been
pending before the reconfiguration.
(As of Release 3.8, no action is required.)
Independent of this, note that a latched trip command
even »survives« a restart of the device.
Check the following issues:
•
• Acknowledge the outputs, if applicable.
•
• Is the status of the output forced to a dedicated
value? (The output can be overwritten for
commissioning purpose, see menu branch [Service /
Test - Prot inhib.].)
• Is the correct parameter set active (1...4)?
•
•
• Is the required protection function active?
• Is overall protection active?
•
•
• Are the field parameters set correctly (CT ratio etc.)?
•
• Are the protection parameters set correctly (trip
value, trip time)?
• Is the assigned protection function blocked?
•
•
• Is the protection function's trip signal routed to the
Trip-Manager of the correct switchgear?
•
• Is the trip signal of the switchgear routed to the
correct relay output?
•
• Is the wiring correct?
E-Series Family Troubleshooting Guide
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