Megger VLF SIN-45 User Manual

Technical Description
10
2 Technical Description
2.1 System Description
The VLF SIN-45 test system enables the standard-compliant withstand testing of
medium voltage cables and other equipment with a genuine 0.1 Hz sine wave test
voltage of up to 45 kV
PEAK
or 32 kV
RMS
.
By means of this type of withstand test, operation-endangering faults, such as
workmanship related problems, as well as insulation faults (e.g. water tree damage in
PE/XLPE cables or local damage in PILC cables) can safely be brought to failure. The
integrated breakdown detection shuts down the test voltage in the event of an excessive
charge current and guarantees limited damage to the cable.
In addition, the optional internal Tan Delta measuring unit allows the operator, during a
step test with a sinusoidal test voltage, to determine the tanδ (Tan Delta) dielectric loss
factor and accordingly accordingly get an idea about the degree of ageing of the cable.
In addition, the system is also suitable for tests with…
• positive and negative DC voltages of up to 45 kV,
• 0.1 Hz VLF cosine rectangular voltage of up to 40 kV with the assistance of the
optional VLF CR Test Boost (VLF CR-40-TB),
• trapezoidal AC voltage (rectangular voltage) of up to 45 kV
PEAK
with a load-
dependent slew rate
The VLF SIN-45 test system combines the following features and functions in a single
system:
• AC voltage test with up to three different voltage waveforms
• DC voltage test with positive and negative polarities
• Full-fledged tanDelta step test with automatic evaluation of the results
• Meaningful Voltage Withstand Diagnosis (VLF test and Tan Delta diagnosis in
one step)
• Leakage current measurement in DC voltage, rectangular voltage and cosine
rectangular voltage test modes
• Sheath test and sheath fault pinpointing with up to 20 kV negative DC voltage
• Manual and automatic frequency adjustment
• Breakdown detection with automatic disconnection of test voltage and discharge
of the test object if the charging current is too high
• Switchable burning function for fault conversion after a voltage breakdown (one
minute maximum)
• Logging (Export in Easyprot logging software via USB interface)
• Firmware updates via USB interface
• Cable screen (earth loop) monitoring
Description
Features

Megger VLF SIN-45 Specifications

General

Brand	Megger
Model	VLF SIN-45
Category	Test Equipment
Language	English