2
SPCU 3C14
Combined overvoltage
and undervoltage
relay module
Contents
Features .......................................................................................................................... 2
Description of operation ................................................................................................. 3
Block diagram ................................................................................................................. 4
Front panel ..................................................................................................................... 5
Start and operation indicators ......................................................................................... 5
Settings ........................................................................................................................... 6
Selector switches
(Modified 99-12) .................................................................................
6
Measured data ................................................................................................................ 8
Recorded information ..................................................................................................... 8
Menu chart ................................................................................................................... 10
Voltage/time characteristic
(Modified 99-10) ................................................................
11
Technical data .............................................................................................................. 12
Serial communication parameters ................................................................................. 13
Event codes ............................................................................................................. 13
Data to be transferred over the serial bus
(Modified 99-12) .....................................
14
Fault codes.................................................................................................................... 17
Features
Three-phase voltage measuring relay module
which also can be programmed for use in single-
phase applications
Overvoltage stage with definite time or inverse
definite minimum time characteristic
Two sets of voltage/time curves selectable at
inverse time operation
Undervoltage stage with definite time charac-
teristic
External blocking of the undervoltage stage via
built-in control input
Automatic blocking of the undervoltage stage
on loss of energizing voltage
Digital display of measured values, set values
and recorded fault values
Serial communication capability for extensive
exchange of data with substation level equip-
ment
Continuous self-supervision of hardware and
software for enhanced reliability and availability
Auto-diagnostic fault codes generated by the
module on detection of a permanent internal
fault
1MRS 750510-MUM EN
Issued 96-12-02
Modified 99-12-20
Version D (replaces 34 SPCU 7 EN1)
Checked KJ
Approved MN
Data subject to change without notice
