The currently effective high band (Veff
hi
)
i
will be at EffBC
I
+ BW/2 and the currently
effective low band (Veff
lo
)
i
will be at EffBC
i
– BW/2, where BW is the regular bandwidth
setting.
Example:
If BC = 120 V, BW = 2 V and the system is in band V
measured
= 120 V.
Initially before the first V
remote
is received, EffBC
i
= BC = 120 V.
Then, if V
remote
= 117 V, BC
bias
= (117–120) = –3, EffBC
i
= 120 – (–3) = 120 + 3 = 123
V
Since V
measured
is 120 V, the control will perform approximately 3 tap operations in the
RAISE direction to bring the V
measured
back in band.
The Remote Voltage Bias feature requires a remote voltage parameter to be written to the
control within a period defined by a Remote Voltage Heartbeat timer. If the timer times
out without the Remote Voltage being written to the control, then the control reverts back
to the normal chosen regulating method using the Bandcenter and LDC settings.
A Forward and a Reverse Remote Voltage parameter can be written to the control utilizing
DNP3.0, MODBUS or IEC 61850 protocols. The range is determined by the "Remote
Voltage Maximum" and "Remote Voltage Minimum" values. Each value has a range from
90.00 to 150.00 volts. Any value received by the control above or below these settings will
be discarded and the Remote Voltage Heartbeat Timer will not be refreshed. Upon
receiving a valid Forward/Reverse Remote Voltage value, the control will start or restart
an internal heartbeat timer with the value set by the "Remote Voltage Heartbeat Timer"
setting. Upon timeout, the control removes the Bandcenter bias and controls solely by the
Bandcenter and LDC settings.
The Forward parameter will be used as V
remote
in Forward Power mode only. This point’s
associated internal timer will only be used in Forward Power mode. Similarly, the Reverse
parameter will be used as V
remote
in Reverse Power mode only. This point’s associated
internal timer will only be used in Reverse Power mode.
The RVB scale factor is the scale factor by which the raw remote voltage value obtained
through the DNP3.0, MODBUS or IEC 61850 analog output point is scaled by before
being used in the Remote Voltage Bias feature.
If Voltage Reduction is initiated while RVB mode is enabled and active, it will be
calculated based on the regular Bandcenter setting, not the Effective Bandcenter.
If Reverse Power is sensed and the control is set to "Regulate Reverse" or "Regulate
Reverse (Measured)", the control will use the "Reverse Remote Voltage" parameter in the
Section 6
1VAC388793-MB A
Configuration
390
TCC300
User Manual
Summary of Contents for TCC300
Page 1: ...Digital Tapchanger Control TCC300 User Manual ...
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Page 3: ...Document ID 1VAC388793 MB Issued 2016 08 10 Revision A Copyright 2016 ABB All rights reserved ...
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