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Testing – 6
6–17
27 Undervoltage, 3 Phase (#1 or #2)
VOLTAGE INPUTS
:
Configuration V1
CURRENT INPUTS:
None
TEST SETTINGS:
Pickup
P
Volts
(5 to 180)
Time Delay
D
Cycles
(1 to 8160)
Programmed Outputs
Z
Output
(1 to 8)
Function 60FL
Disable
Function 27#1 or #2
Disable
Functions 25, 79
Disable
■
■
■
■
■
NOTE
: If 27#1 and 27#2 have different pickup settings, it would be efficient to disable the one with the higher
setting first and test the lower setting operation, since the higher setting operation could then be
tested without disabling the lower.
1.
Disable functions as shown. Refer to Section 3.2, Configure Relay Data, for procedures.
2.
Confirm settings to be tested.
3.
Connect voltage input in Configuration V1 designated previously. Refer to Section 6.1, Equipment/Test
Setup
,
for configuration. Set at Nominal Voltage.
4.
Pickup Test
: Hold the
TARGET RESET
button in and slowly decrease the input voltage on phase A
until the
27 PHASE UNDERVOLTAGE
LED illuminates, or the pickup indicator operates on the
computer target screen. The level should be equal to
P
volts
&
0.5V or ±5%*. Release the
TARGET
RESET
button and increase the input to the nominal voltage and the
OUTPUT
LED will extinguish.
Press
TARGET RESET
button to remove targets.
5.
Time Test
: With output contacts connected to the timer, apply (
P
-1) Volts and begin timing. The
contacts will close after
D
cycles within –1 or +3 cycles or
&
1%.
6.
Test phases B and C by repeating steps 4 and 5.
7.
If testing is complete, enable any functions disabled for this test. If further testing is desired, check
the proper functions to disable for the next test and continue from this point.
* When both RMS and Line-to-Ground to Line-to-Line is selected, the accuracy is
&
0.8V or .75%.
Содержание M-3520
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