9.5.8 Manual voltage regulation
The manual raising and lowering commands can be given either via the
configuration inputs LOWER_LOCAL and RAISE_LOCAL, via the HMI of the IED
or via remote commands. The acting operation mode of OLATCC must be set to
"Manual" and the Local/Remote control LR state monitored data of the IED has to
be "Local" to execute the control commands manually from HMI or via
configuration inputs. Although OLATCC is set to "Manual" but the LR state is set
to "OFF" or "Remote", no manual control commands can be given.
For remote commands, the acting operation mode of the OLATCC function must
also be set to "Manual" and the LR state monitored data has to be "Remote".
The manual raising or lowering commands can be given locally either via the
Manual control parameter ("Cancel"/"Lower"/"Raise") located in the HMI menu
Control/OLATCC1 or via the configuration inputs LOWER_LOCAL or
RAISE_LOCAL.
A raising command is given by selecting the enumeration value "Raise" and the
lowering command is given by selecting the enumeration value "Lower". An
accepted manual raising/lowering command activates the corresponding output
RAISE_OWN or LOWER_OWN to control the voltage of the own transformer.
Voltage control vs. tap changer moving direction
OLATCC has the control settings Lower block tap and Raise block tap. The Lower
block tap and Raise block tap settings should give the tap changer position that
results in the lowest and highest controlled voltage value (usually at the LV side of
the transformer). The setting of both Raise block tap value higher than Lower block
tap value and Lower block tap value higher than Raise block tap value is allowed.
When the value of Raise block tap exceeds the Lower block tap value, the raise
control activates the RAISE_OWN output. This results in raising the tap changer
position, and the measured voltage rises. Furthermore, the RAISE_OWN output
value is TRUE. If the own tap changer position is connected (that is, the own tap
changer's quality is good), the tap changer alarm is activated if the tap changer does
not move upwards in the Cmd error delay time setting after the pulse activation,
resulting that ALARM_REAS in the monitored data contains a command error
value. The Cmd error delay time setting default value is 20 seconds.
The lowering control works in a similar way, as shown in
Figure 397. In the output
data the LOWER_OWN output value is TRUE. An alarm is generated if the tap
changer does not move downwards in Cmd error delay time after the pulse
activation (assuming that the own tap changer position is connected).
In the second case, the parameters are set so that the value of Lower block tap
exceeds the value of Raise block tap. The raising control activates the
RAISE_OWN output. The result should be that the tap changer lowers its position
and the measured voltage rises. Furthermore, the RAISE_OWN output value is
TRUE in the output data. If the own tap changer position is connected, the tap
1YHT530004D05 D Section 9
Control functions
615 series 731
Technical Manual
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