Characteristics; Application; Alarming Functions - ABB SPEF 3A2 C User Manual And Technical Description

Characteristics

Application

Alarming
functions
Three-phase overcurrent unit with definite time
characteristic
Phase unbalance indicator with definite time
characteristic
Neutral residual overcurrent unit
Alternative analog or digital outputs if SPA bus
not available
The fault indicator SPEF 3A2 C is used in
disconnector terminal units (DTU) with KOHU
24A1 or KOKU 072G3 current sensors to indi-
cate short-circuit faults, earth faults and broken
lines in a medium voltage distribution network.
With the fault indicator it is possible to get
information about measured and set values via a
disconnector terminal unit to a SPIDER or
I
L1
I
L2
I
L3
Control
input BS
Fig. 1. Function of the fault indicator type SPEF 3A2 C.
Digital display of measured and set values and
sets of data recorded at the moment when a fault
occurs
All measured values are displayed in amperes
All settings may be entered via the push-buttons
on the front panel or via a personal computer
Continuous self-supervision of hardware and
software. At a permanent internal fault all stages
and outputs are blocked. This fault signal can be
read via Weidmuller connection X1-6.
MicroSCADA. This information can be used
e.g. to locate faults in a medium voltage distri-
bution network.
If no serial communication (SPA bus) is avail-
able, it is possible to use output relays and analog
outputs. The analog outputs are continuously
monitoring the condition of the network and
the output relays are signalling fault indications.
Three-phase definite time
overcurrent indicator
Definite time earth-fault
indicator
Phase unbalance
indicator
Serial communication
I > alarm
I
> alarm
51
0
∆ I alarm
Analog output I
51N
Analog output I
Analog output ∆ I
37
IRF
SERIAL I/O
funcblck
load
0
3