Eaton 600 A 15 kV class push-OP Installation, Operation And Maintenance Instructions

Tap position indication
The control has the ability to track the position of the
tap-changer. The tap position indication (TPI) function senses
the status of the motor and neutral light circuits and does
not require source (input) voltage. The present tap position
is stored at FC 12.
EXAMPLES: “8” at FC 12 indicates 8 raise and “-7”
indicates 7 lower.
The TPI function is synchronized to the position of the
tap-changer by running the regulator to the neutral position.
To manually set the present tap position: Access security
level 3; access FC 12; use the Edit key to change to the
desired value.
The maximum tap position since last reset (upper drag-hand
value of the present tap position) and its date and time are
stored at FC 27. The minimum tap position since last reset
(lower drag hand value of the present tap position) and its
date and time are stored at FC 28.
The TPI drag hand values and dates/times are reset to the
present values by the master reset, FC 38, or by resetting
each of the values individually. The drag hand reset switch
resets the drag hands of the position indicator only, not TPI.
All TPI values are stored in non-volatile memory.
The following conditions could occur if the present tap posi-
tion was manually set incorrectly:
• The present tap position value will go to invalid “---”
if the present tap position is 0 (zero, neutral) but no
neutral signal is detected. For example, this condition
will occur if a replacement control with present tap
position set to “0” is installed on a regulator which is
not in the neutral position.
• If the TPI function detects a successful upward tap and
the prior value of FC 12 was “16”, or a successful down-
ward tap is detected and the prior value of FC 12 was
“–16,” the prior value will be maintained.
The display will show a diagnostic error message upon
power-up when: (1) the present tap position value prior to
power-up is “---” (invalid) and the regulator is not in neutral
position; (2) The present tap position prior to power-up is
“0” and the regulator is not in the neutral position. [This
condition will cause the present tap position value to go to
invalid (“----”)]; and (3) During automatic or manual operation
the present tap position changes to “0”, but a neutral
signal is not received. The No Neutral Sync signal is an
attention signal, not a failure signal.
The TPI will satisfy the diagnostics routine upon power-up
when: (1) The regulator is in neutral and the present tap
position is “0”; (2) The present tap position is not “0”
and the regulator is not in neutral, including when the tap
position is not set correctly; and (3) When the regulator is in
neutral and the present tap position is not “0” (TPI will self-
correct and reset the tap position).
Source-side voltage
Without a source voltage input, some functions will indicate
dashes when displayed. There are three methods for
supplying a source-side voltage to the CL-6 control: a
differential potential transformer (PT), an external source-
side PT, or source-side voltage calculation.
Differential voltage
The regulator may be designed and ordered with an internal
differential potential transformer (IDPT). This is noted by the
schematic on the voltage regulator nameplate. A differential
PT supplies the voltage difference between the source
and load bushings of the voltage regulator. This differential
voltage is then combined with the load voltage to provide
the source-side voltage. When using an IDPT on an Eaton
voltage regulator, the source voltage accuracy is within ±
1%.
External source voltage
An external source-side PT may be connected to the
voltage regulator to supply a directly measured source
voltage. To use an external source-side PT, the user must
change Vin PT Configuration, FC 146, from the default
Vdiff Mode to Vin Mode. Using an external source-side PT
may be desirable if the voltage regulators are in a closed-
delta configuration. In a closed delta, the source voltage
and percent regulation will only reflect the true system
source values if an external source voltage is used. Voltage
regulator performance is not affected by the difference
between metering parameters when using an external
source PT: the accuracy of the source voltage is dependent
upon the accuracy of the PT.
Source-side voltage calculation
The CL-6 control has the ability to calculate the source-side
voltage without a series-winding PT or an external PT.
When this feature is turned on, the control will use the
load voltage from the main PT, the regulator type (Type A,
Type B, Type C or Type D), the tap position, and the internal
impedance of the regulator to calculate the source-side
voltage. This calculated source voltage is within ±1.5% of
actual. Only the regulator type needs to be programmed
into the control. The other values are already available to the
control.
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CL-6 SERIES CONTROL INSTALLATION, OPERATION, AND MAINTENANCE INSTRUCTIONS MN225016EN January 2016

Eaton 600 A 15 kV class push-OP Specifications

General

Brand	Eaton
Model	600 A 15 kV class push-OP
Category	Cables and connectors
Language	English