Control; Measurement; Protection Function Overview Of Preconfiguration B - ABB RET630 Product Manual

Transformer Protection and Control
RET630
Product version: 1.0
Figure 3. Protection function overview of preconfiguration B

5. Control

The IED incorporates local and remote
control functions. The IED offers a number of
freely assignable binary inputs/outputs and
logic circuits for establishing bay control and
interlocking functions for circuit breakers and
motor operated switch-disconnectors. The
IED supports both single and double busbar
substation busbar layouts. The number of
controllable primary apparatuses depends on
the number of available inputs and outputs in
the selected configuration. Besides
conventional hardwired signaling also
GOOSE messaging according to IEC
61850-8-1 can be used for signal interchange
between IEDs to obtain required interlockings.
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Further, the IED incorporates a synchro-
check function to ensure that the voltage,
phase angle and frequency on either side of
an open circuit breaker satisfy the conditions
for safe interconnection of two networks.

6. Measurement

The IED continuously measures the high
voltage (HV) side and the low-voltage (LV)
side phase currents and the neutral current(s)
of the protected transformer. Further, it
measures the positive and negative sequence
currents on both sides. The IED also
measures phase-to earth or phase-to-phase
1MRS756788 A
Issued: 15.09.2009
ABB