Megger INGVAR, User Manual

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10 ZP-BH05E BH0654BE
2 INTRODUCTION
2
I
ntroduction
2.1 General
INGVAR is intended for use in high-voltage substa-
tions and industrial environments, for laboratories and
testing purposes. INGVAR consists of a Control Unit
equipped with a control panel and a Current Unit. The
units are portable and easy to connect.
INGVAR is designed to generate short-duration cur-
rent, and is protected from overheating. Under special
circumstances, INGVAR can generate up to 5,000
amperes.
The Control Unit controls the current output (gen-
eration) from the Current Unit and is equipped with
sophisticated measurement facilities. The Control Unit
can sense the phase angle and adapt subsequent gen-
eration operations so that they all start at the current’s
zero-cross-over points. This ensures minimized DC
offset in connection with starting.
Current generation
Current can be generated in many ways:
▪
Continuously.
▪
During a preset maximum time.
▪
As long as you press a button.
▪
Until an external signal activates the stop input.
▪
At a lower current (I/30) to avoid unnecessary heating
of the object being tested while the current is being
adjusted.
▪
In pulses (both pulse duration and between-pulse pause
are user-definable).
The measurement section
contains/provides
▪
Timer.
▪
Digital ammeter (true RMS).
▪
An additional channel for measuring a voltage or a
second current.
▪
Direct display of the turns ratio of a current transformer.
▪
Provisions for measuring phase angle Z, P, R, X, S, Q and
power factor (cos
ϕ
).
▪
Currents and voltages expressed (if so desired) as
percentages of nominal values.
▪
Fast-acting hold function. Measured values can be frozen
in response to a signal arriving at the stop input and/or
when the current is interrupted.
In addition to its normal working mode, there are spe-
cial INGVAR settings supporting the following types of
testing:
▪
Testing of direct acting automatic reclosers.
▪
Testing of sectionalizers.
Even though INGVAR features outstanding versatility,
it is very easy to use because:
▪
You can start generation whenever desired.
▪
You can repeat a measurement by simply pressing a
button. It is not necessary to clear the display first.
▪
You can save different settings for INGVAR in ten different
memories.