Megger MVCT - Mvct; Introduction; Terminology; Acronyms

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1.0 MVCT
1.0 Introduction
The Megger MVCT test set is a lightweight, robust, portable unit used to automatically or manually test
both voltage and current transformers. For inductive VT, the MVCT is capable of performing saturation,
ratio, secondary winding resistance, secondary short circuit impedance and various insulation tests. The
MVCT is also capable of performing saturation, ratio, polarity, winding resistance, demagnetizing tests
and insulation tests on current transformers. The MVCT provides a microprocessor controlled variable
voltage and current output and precision instrumentation for automatically testing single and multi-
ratio CTs and VT’s reducing testing time and increasing productivity. The MVCT will directly connect to
multi ratio CT’s and perform all tests – saturation, ratio and polarity, winding resistance, and insulation –
on all taps with the push of a button and without changing leads. The MVCT can be controlled via an
integrated large, full color, high resolution, TFT LCD touch screen which allows the user to perform
manual and automatic testing quickly and easily using the manual test screens, as well as using pre-
constructed test routines. The large color display permits the user to easily read all pertinent data while
the test is being performed and provides the ability to view the current transformer’s saturation curve.
The MVCT can also be configured to come without a display and be controlled via a laptop.
Both current transformers and voltage transformers can be tested in their equipment configuration,
such as being mounted in transformers, oil circuit breakers or switchgear. It is necessary for the
equipment to be completely isolated from the electrical system prior to testing.
1.2 Terminology
The acronyms, terms, and definitions used throughout this manual are described below:
1.2.1 Acronyms
AC Alternating Current
CW Clockwise (rotation)
CCW Counter Clockwise (rotation)
CT Current Transformer
DC Direct Current
GPS Global Position System
GUI Graphical User Interface
Hz Hertz