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1.9
RATED CURRENT:
The DTR system can work with current transformers with nominal current 1Amp or 5Amp, user only has to wire to
terminals B3-B4 for 1Amp or terminals A7-A8 for 5Amp. It is necessary to set the nominal current in these settings in
order to let DTR know which terminals must use.
1.10
NO. OF OPERATIONS
This setting allows the user to set the maximum number of allowed operations on the OLTC before blocking the
regulation automatism in its automatic mode. If the user set this setting to 0, this function is Out of Service, the
operations counter is never increased and there is no blocking on the regulation automatism.
1.11
NO. OF SUCCESSIVE OP.
1.12
TIME WINDOW:
These settings allow setting the number of allowed operations in a determined period of time. When it is set to 0, this
function is Out of Service.
1.13
MAXIMUM TAP:
This setting tells to DTR system the maximum tap number available in the OLTC, so when DTR reaches this tap, it
never will try to raise the tap even if the voltage level requires it.
1.14
MINIMUM TAP:
This setting tells to DTR system the minimum tap number available in the OLTC, so when DTR reaches this tap, it
never will try to lower the tap even if it is required by the voltage level.
1.15
VOLTAGE TYPE
To calculate cos Φ and the power values we need to select using this setting the VT voltage, either phase-to-ground
or phase-to-phase.
1.16
DIRECT/INVERSE MODE
When in DIRECT MODE, the unit assumes that to increase the line voltage level it is necessary to raise the regulator
tap, and to decrease the line voltage, we will need to lower the tap.
When in INVERSE MODE, the unit assumes that to increase the line voltage level it is necessary to lower the
regulator tap, and to decrease the line voltage, we will to raise the tap.
1.17
CALIBRATION FACTOR
In order to approximate the relay measure to the real line measure in operating conditions, this setting is used to
center the relay measure if any deviation is detected. The setting modifies the measured voltage value up to a ± 5%
in steps of 0.1%
38
3. SETTINGS
DTR Digital Tap Changer Controller
GE—106305A
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