Megger INGVAR, Руководство пользователя

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BH0654BE ZP-BH05E 43
7 HOW TO USE INGVAR
7.15 Measuring tripping/
operation times
Here, generation continues until the protective relay
equipment operates or the breaker trips. To avoid
unnecessary heating or operation of the object being
tested, the I/30-function can be used (see section 7.3
”Setting the desired current” in this chapter) while the
current is being adjusted.
1]
Basic settings:
OPERATE OFF
CURRENT ADJUST Lower than the operating limit
HOLD function ON
AUTO OFF STOP INPUT
2]
Set the stop condition to (for example):
3]
Press
TIME
to start generation.
4]
Set the current at which the operating time
is to be measured. The current must exceed
the operating limit by an ample margin.
5]
Press OFF button to turn off the current.
6]
Press
TIME
and wait until the stop condition is
met.
7]
Read the time and the current from the
display.
7.16 Instantaneous trip
unit measurement
You can test the instantaneous trip for breakers and
for protective relay equipment as follows:
▪
When you test the
instantaneous pick-up
you can
generate current by using the
MOM
button. This permits
you to find the instantaneous pick-up without operating
the overcurrent stage.
▪
You can also use limited-time generation ( MAX TIME ) to
obtain the desired generation time.
Manually-controlled momentary injection is described
below:
1]
Basic settings:
OPERATE OFF
CURRENT ADJUST Close to the operating limit
HOLD function ON
2]
• For protective relay equipment:
Set the stop condition to (for example):
• For breakers:
Set the stop condition to INT
3]
Select a suitable current setting.
4]
Press
MOM
briefly. The interval throughout
which current is sent out must be shorter
than the overcurrent stage’s tripping/operat-
ing time.
5]
Change the current setting somewhat and
repeat, starting at step 4 above, until you
find the lowest current that provides instan-
taneous pick-up.
When you test the instantaneous trip time make
the following settings. Use the I/30 function (de-
scribed in section 7.3 “Setting the desired current”
in this chapter) while making current adjustments to
avoid undesired operation of the object being tested.
1]
Basic settings:
OPERATE OFF
CURRENT ADJUST Instantaneous 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.