•
TCC300 Tapchanger Controls
•
ABB M-2025B(D) Current Loop Interface
•
Existing installations may use the Crompton Model 253-TRTU transducer or the
Rochester Instrument Systems Model PR-2050 transducer (both now obsolete).
•
New installations or existing installations with failed transducers use the Carrel
Precision Model T-R Series transducer (or equivalent).
The typical application illustrated in
uses a resistor string mounted on a
separate insulating deck within the tap-changing mechanism. The resistor string is
comprised of equal value and wattage resistors. Depending on manufacture and age the
resistance varies from 10 to 400 ohms between each tap and can have either the same
valued resistors between multiple neutral positions or direct wire connections.
10
9
8
7
6
5
4
3
2
1
11
12
13
14
15
16
17
18
19
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
AC/DC
Supply
Scaling
Resistor
M-2025B(D)
4-20 mA signal
TCC300
LTC Control
Interface Cable
RTU /
SCADA
RS-485
or FO
C&C T-R Series
Resistance
Transducer
Current Loop
Interface
HMI Tap
Position
GUID-AD83A531-15DC-4D67-9A61-549E444E48E6 V1 EN
Figure 360:
Tap Position Scheme Using Resistor Divider KeepTrack
The application uses a tap position transducer driven from a customer selectable AC or DC
voltage source. The transducer provides a low DC voltage of 1 to 10 volts to the resistor
string of the tapchanger mechanism. The transducer measures the DC voltage from the
wiper on the currently active tap, comparing it to the voltage applied to the string. The
transducer then converts that voltage to a current loop value of 0-1 mA or 4-20 mA for
transmission of an analog signal. The M-2025B(D) Current Loop Interface module
accepts this current analog signal. The scaling to the correct number of taps is achieved by
sizing the scaling resistor to obtain a 3.0 V signal at the maximum tap position.
Older installations may use the Crompton Model 253-TRTU transducer or the Rochester
Instrument Systems Model PR-2050 transducer, both of which are now obsolete. The
1VAC388793-MB A
Section 6
Configuration
TCC300
455
User Manual
Summary of Contents for TCC300
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