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7 Application examples
4.
If the display window is to freeze the
voltage reading at the instant of operation,
check to see that the HOLD function is
active (it can be activated by means of the
HOLD button).
Pick-up and drop-out functions: U >
ON and U > OFF
1.
Turn on the Sverker voltage source by
activating ON with the start switch (press
the
t
key once), whereupon the ON indica-
tor lamp will light.
2.
Increase the voltage carefully until the
protective relay equipment operates (U >
ON), whereupon the Sverker TRIP indicator
will start to glow steadily.
3.
Read the
U > ON
value from the Sverker
display window.
4.
If the freeze function has been activated,
press the HOLD button twice to unfreeze
the value shown.
5.
Decrease the voltage until the relay is
reset (U > OFF (drop-out)), whereupon the
TRIP indicator will be extinguished.
6.
Read the
U > OFF (drop-out)
value from
the Sverker display window.
7.
Decrease the voltage to 0.
8.
Turn off the Sverker current source by
setting the start switch to the OFF position.
Operating function: U > ON + TIME
DELAY
1.
Turn on the Sverker voltage source by
activating ON with the start switch where-
upon the ON indicator lamp will light.
2.
Increase the voltage to 1.5 x U > ON.
3.
Turn off the Sverker voltage source by
setting the start switch to the OFF position.
4.
Activate ON + TIME by means of the start
switch, whereupon the timer will start and
the voltage source will start to generate
voltage.
5.
When the protective relay equipment
operates, the timer will stop automatically
and the voltage source will be turned off
automatically, whereupon the TRIP indica-
tor will start to flash.
7.1 Testing voltage
relays
The following functions are to be tested:
• Pick-up function: U > ON
• Drop-out function: U > OFF
• Operating time: U > ON + TIME DELAY
Test hookup and initial settings
1.
Connect for testing as shown in the above
diagram. a. Connect the Sverker AC voltage
to the protective relay equipment. b. Also
connect the Sverker AC voltage to the
voltmeter input. c. Connect the timer stop
input (STOP) to the relay trip output.
2.
Turn on power to Sverker using the mains
switch.
3.
Activate the desired stop condition for the
timer by setting the stop input for a make
and/or break function and for a live or
dead contact.
Summary of Contents for Programma Sverker 750
Page 1: ...SVERKER 750 760 User s manual Relay Test Unit ...
Page 28: ...2 9 S V E R K E R 7 5 0 7 6 0 P r o g r a m m a E l e c t r i c A B Z P C D 0 1 E R 0 5 A ...
Page 75: ...7 6 S V E R K E R 7 5 0 7 6 0 P r o g r a m m a E l e c t r i c A B Z P C D 0 1 E R 0 5 A ...
Page 76: ...Subject to change without notice Printed matter ZP CD01E R05B 2007 ...