1
I. Overview
High voltage withstand test of electrical equipment is one of the most important items specified in
insulation preventive test.
The withstand voltage test can be divided into ac withstand voltage test and dc withstand voltage
test. The ac withstand voltage test can be divided into power frequency, frequency conversion
and 0.1hz ultra-low frequency test technology, of which 0.1hz ultra-low frequency technology is
the latest technology recommended by the current international electrotechnical commission. Our
company's new generation of ultra-low frequency and high voltage generator is the core product
independently developed with the latest American technology. It adopts 7-inch touch screen, the
latest arm7 single chip microcomputer, high-speed ad acquisition circuit, and is equipped with
background management software. It overcomes many shortcomings of domestic similar
products (see table 1), and its cost performance is much higher than that of similar imported
products. It is especially suitable for withstand voltage test of electrical equipment with large
insulation equivalent capacitance (such as power cable, power capacitor, large and medium-
sized generator and motor, etc.), which conforms to the national standard of electric power
industry, general technical conditions for ultra-low frequency and high voltage generator (d) newly
issued in 2004 l / t849.4-2004.
0.1Hz
voltage-
withstand
equipment
type
HV control
method
High
voltage
waveform
Energy saving
Noise Lifespan Electrical
life
mechanical
HV
mechanical
switch
switching
polarity
Square
wave
Not energy-saving:
consume excess
energy with high-
power resistors
High
short
Short
Electronic
HV
electronic
switch
switching
polarity
Sine
wave
Energy saving: feed
back excess power to
the grid
A
little
No
lifespan,
can use
long-
term
Long
Table 1 performance comparison between mechanical type and electronic type of 0.1Hz
voltage withstand test equipment
