Secondary System Supervision; Control - ABB Relion 650 series RET650 Product Manual

ABB
Transformer protection RET650
Product version: 1.1
8. Secondary system
supervision
Breaker close/trip circuit
monitoring TCSSCBR
The trip circuit supervision function TCSSCBR
is designed to supervise the control circuit of
the circuit breaker. The invalidity of a control
circuit is detected by using a dedicated
output contact that contains the supervision
functionality.
The function operates after a predefined
operating time and resets when the fault
disappears.

9. Control

Bay control QCBAY
The Bay control QCBAY function is used
together with Local remote and local remote
control functions is used to handle the
selection of the operator place per bay.
QCBAY also provides blocking functions that
can be distributed to different apparatuses
within the bay.
Local remote LOCREM /Local
remote control LOCREMCTRL
The signals from the local HMI or from an
external local/remote switch are applied via
the function blocks LOCREM and
LOCREMCTRL to the Bay control (QCBAY)
function block. A parameter in function block
LOCREM is set to choose if the switch signals
are coming from the local HMI or from an
external hardware switch connected via
binary inputs.
Voltage control TR8ATCC,
TCMYLTC
Automatic voltage control for tap changer,
TR8ATCC and Tap changer control and
supervision, 6 binary inputs TCMYLTC are
used for control of power transformers with a
1MRK 504 127-BEN -
Issued: February 2011
motor driven load tap changer. The functions
provide automatic regulation of the voltage
on the secondary side of transformers or
alternatively on a load point further out in
the network.
Control of a single transformer, as well as
control of up to two transformers within a
single RET650, or parallel control of up to
four transformers in two separate RET650 is
possible. Note that the last alternative is
achieved by using the GOOSE interbay
communication on the IEC 61850-8-1
protocol. For parallel control of power
transformers, three alternative methods are
available, the master-follower method, the
circulating current method and the reverse
reactance method.
In RET650 a local HMI page with voltage
control status and manual control possibilities
is available. Manual control is under authority
control if so defined.
IEC09000670 V1 EN
Figure 5. Manual control via local HMI
Voltage control includes many extra features
such as possibility of to avoid simultaneous
tapping of parallel transformers, extensive
tap changer monitoring including contact
wear and hunting detection, monitoring of
the power flow in the transformer so that for
example, the voltage control can be blocked
if the power reverses etc.
In manual operating mode it is possible to
give raise- or lower-commands to the load
tap changer from the local HMI. Such
facilities are pre-made in the factory.
IEC09000670-1-en.vsd
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