methods are available, the master-follower method, the circulating current method
and the reverse reactance method. The first two methods require exchange of
information between the parallel transformers and this is provided for within IEC
61850-8-1.
Voltage control includes many extra features such as possibility of to avoid
simultaneous tapping of parallel transformers, hot stand by regulation of a transformer
in a group which regulates it to a correct tap position even though the LV CB is open,
compensation for a possible capacitor bank on the LV side bay of a transformer,
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.
14.4.3
Tap changer control and supervision, 6 binary inputs
TCMYLTC and TCLYLTC
The Tap changer control and supervision, 6 binary inputs (TCMYLTC) and 32 binary
inputs TCLYLTC gives the tap commands to the tap changer, and supervises that
commands are carried through correctly. It has built-in extensive possibilities for tap
changer position measurement, as well as supervisory and monitoring features. This
is used in the voltage control and can also give information about tap position to the
transformer differential protection.
14.4.3.1
Operation principle
Reading of tap changer position
The tap changer position can be received to the tap changer control and supervision,
6 binary inputs TCMYLTC or 32 binary inputs TCLYLTC function block in the
following ways:
1. Via binary input signals, one per tap position (max. 6 or 32 positions).
2. Via coded binary (Binary), binary coded decimal (BCD) signals, or Gray coded
binary signals.
3. Via a mA input signal.
Via binary input signals, one per tap position
In this option, each tap position has a separate contact that is hard wired to a binary
input in the IED. Via the Signal Matrix tool in PCM600, the contacts on the binary
input card are then directly connected to the
•
inputs B1 – B6 on TCMYLTC function
•
or inputs B1 – B32 on TCLYLTC function.
Section 14
1MRK502052-UEN B
Control
744
Technical manual
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