ABB RELION RET670, Applications Manual

Page: 72 / 1016

3.1.1.4 Description of configuration B40
M15203-61 v6
The configuration of the IED is shown in Figure 6 .
This configuration is used in applications with two winding transformers in multi-
breaker arrangement on one or both sides. The protection scheme includes a 3–phase
tripping scheme with a synchronism check function for manual closing of the low
voltage side breaker. The high voltage breaker is foreseen to always energize the
transformer and be interlocked with an open LV side breaker. High voltage circuit
breaker synchronism check function is optional for system where synchronism check is
required to close the bays/rings.
The differential protection is the main protection function. It provides fast and sensitive
tripping for internal faults. Stabilization against through faults, inrush and
overexcitation are standard features. The function is provided with six stabilized inputs
which allows all CT sets possible with multi-breaker arrangements on several of the
windings to be possible.
Measuring functions for S, P, Q, I, V, PF, f are available for local presentation on the
local HMI and/or remote presentation. The availability of additional analog inputs
allows connection of separate metering cores and a calibration parameter on the
measurement function allows calibration at site to very high accuracy.
The following should be noted. The configuration is made with the binary input and
binary output boards in the basic IED delivery. In many cases this is sufficient, in other
cases, for example with full control of all apparatuses included more IO cards are
required. Our proposal for a full version with control is to use three binary input
modules and two binary output modules. For systems without substation automation a
second binary output board might be required.
Section 3
1MRK 504 163-UUS A
Configuration
66 Transformer protection RET670 2.2 ANSI
Application manual