3.4
Protection and Control
Description
Information
Corrective Action
After first start-up of the protective device there is a
pending trip.
Two red LEDs are illuminated at the front of the HMI.
They indicate a trip and an alarm.
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”
.
The switchgears cannot be operated by SCADA
communication.
Set the [Control / General Settings] »Switching Authority« of
the device to either “Remote” or “Local and Remote”.
Problem with current and voltage measurement.
The measured values of current and voltage show a
big fluctuation.
Adjust [Field Para / General Settings] »f« to the connected grid
frequency (50 Hz or 60 Hz).
The trip command is kept in latched state.
A latched trip command has been reconfigured from
latched to unlatched.
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 3.6, no action is required.)
Independent of this, note that a latched trip command
even »survives« a restart of the device.
Binary outputs do not react.
The contacts of the binary outputs do not open or
close. This can be checked by simulating a fault and
checking the binary output contacts with
measurement equipment.
Check the following issues:
• Acknowledge the binary outputs, if applicable.
• Is the status of the binary output forced to a dedicated
value? (The binary output can be overwritten for
commissioning purpose, see menu branch [Service / Test
(Prot inhibit)].)
• 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
binary output?
• Is the wiring correct?
16
Troubleshooting Guide
HPT-3.6-EN-TSG
3 Problems with the Device
3.4 Protection and Control
