Megger INGVAR, User Manual

Page: 42 / 72

42 ZP-BH05E BH0654BE
7 HOW TO USE INGVAR
6]
Press
TIME
to start generation and turn up the
current until the protective relay equipment
operates (pick-up).
7]
Turn down the current until drop-out occurs.
The value frozen when drop-out occurred is
now presented on the display.
For protective relay equipment you can simplify the
procedure by testing both the pick-up and drop-out
functions with a single current generation operation.
This can be accomplished as follows:
1]
Basic settings:
OPERATE OFF
CURRENT ADJUST Lower than the tripping/operating
limit
HOLD function ON
AUTO OFF Turn off the AUTO OFF function
(neither the STOP INPUT nor the MAX
TIME lamp will be lit)
2]
Select the stop condition:
3]
Start current generation.
4]
Increase the current until the protective relay
equipment operates (pick-up).
5]
Read the pick-up function value from the
display.
6]
Press
RESET
.
7]
Turn down the current until the protective
relay equipment drops out. You can now on
the display read the value that was frozen
when drop-out occurred.
Method 2: Manually controlled
momentary injection
Here, current is sent out as long as you hold down the
MOM button. This method is useful when you do not
want to expose the object being tested to unneces-
sary heat.
1]
Basic settings:
OPERATE OFF
CURRENT ADJUST Close to the operating limit
HOLD function ON
AUTO OFF STOP INPUT
2]
• For protective relay equipment:
Set the stop condition to (for example):
• For breakers:
Set the stop condition to INT
3]
Press
MOM
briefly.
Note, however, that current must be sent out
for a period longer than the operating time.
4]
Read the current from the display.
5]
Change the current setting somewhat.
6]
Repeat, starting at step 3 above, until you
find the lowest current that provides opera-
tion.
Method 3: Limited-time generation
Here, current is sent out for a limited period of time
and interrupted when a present maximum time (
MAX
TIME ) is reached. This method is useful when you do
not want to expose the object being tested to un-
necessary heat. Section 7.4 “Setting times for limited-
time generation (
MAX TIME )” explains how to set
MAX TIME .
1]
Basic settings:
OPERATE OFF
CURRENT ADJUST Close to the tripping/operating limit
HOLD function ON
AUTO OFF Specify MAX TIME (choose a
generation time that is longer than
the operating time) and also specify
STOP INPUT
2]
• For protective relay equipment:
Set the stop condition to (for example):
• For breakers:
Set the stop condition to INT
3]
Press
TIME
to start generation.
4]
Read the current on the display after genera-
tion has stopped.
5]
Change the current setting somewhat.
6]
Repeat, starting at step 3 above, until you
find the lowest current that provides opera-
tion.