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Features
Application
Two-stage residual overvoltage relay module
containing a low-set residual overvoltage stage
U
> and a high-set residual overvoltage stage
0
U
>>
0
Both residual overvoltage stages feature definite
time characteristic and wide setting ranges
Two-stage undervoltage relay module containing
a higher under voltage stage U< and a lower
undervoltage stage 3U<<
The three-phase undervoltage stage U< starts if
one or more of the phase-to-phase voltages fall
below the set start level
The three-phase under voltage stage 3U<< starts
if all three phase-to-phase voltages fall below the
set start level
The voltage relay SPAU 331 C is intended for
the supervision of the bus bar voltages of distri-
bution substations, both the residual voltage and
the phase-to-phase voltages. The complete volt-
age relay contains two protection relay modules.
The residual voltage is measured with a residual
overvoltage relay module type SPAU 1C6 in-
cluding two operation stages. The phase-to-
phase voltage is measured with an undervoltage
relay module type SPCU 3C15.
The under voltage stage U< can be given defi-
nite time characteristic or inverse time charac-
teristic while the under voltage stage 3U<< fea-
tures definite time characteristic only
Numerical display of setting values, currently
measured values, fault values, operate times,
event messages etc.
Serial interface for connection of the relay to
the serial bus and a substation level communi-
cation and reporting system and/or a remote
control system
High system reliability and availability through
integrated self-supervision system with auto-
diagnostics capabilities in the relay modules
The voltage relay SPAU 331 C is a member of
the SPACOM product family and as such it is
provided with a serial communication port.
Over the serial communication port and an
optional bus connection module of the SPA-
ZC_ series the relay can be connected to the
optical fibre SPA bus and further to a substa-
tion level data communication and reporting
system and/or a remote control system.
3
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