Testing Directional Over-Current Relay Systems Or Directional Ground-Fault (Earth-Fault) Relay Systems; Sverker 780 - Megger SVERKER 750 User Manual

2]
Increase the current to 1.1-1.2 x I >> ON.
3]
Turn off the SVERKER current source by set-
ting the start switch to the OFF position.
4]
Activate ON + TIME using the start switch,
where-upon the timer will start and the cur-
rent source will start to generate current.
5]
When the protective relay equipment oper-
ates, the timer will stop automatically and
the current source will be turned off auto-
matically, whereupon the TRIP indicator will
start to flash.
6]
Read the I >> ON + TIME DELAY value from
the SVERKER display window.
7]
For the remaining phases, repeat the steps
1-6 as set forth above.
Finishing the test
1]
Enter the values read from the display into
the test report.
2]
Turn off power to SVERKER using the mains
switch.
3]
Disconnect the equipment.
ZP-CD03E
7.3 Testing directional
over-current relay systems
or directional ground-fault
(earth-fault) relay systems

SVERKER 780

The following functions are to be tested:
• Pick‑up functions: I > ON and U > ON
• Drop‑out functions: I > OF and U > OFF
• Operating time: I > ON + TIME DELAY
Test hook-up and initial settings
Connect for testing as shown in the above diagram.
1]
Connect the SVERKER separate 0-230 V AC
voltage output to the protective relay equip-
ment input (U).
2]
Also connect the SVERKER separate AC volt-
age output to the voltmeter input.
3]
Connect the SVERKER current source, via the
ammeter input and the set of resistors (the
resistor you select will depend on the testing
current) to the current input (NI) to the pro-
tective relay equipment.
4]
Connect the timer stop input (STOP) to the
relay trip output.
5]
Turn on power to SVERKER using the mains
switch.
7 APPLICATION EXAMPLES
SVERKER 750/780 59