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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

Содержание VLF Hipot

Страница 1: ...VLF Hipot Tester Huazheng Electric Manufacturing Baoding Co Ltd...

Страница 2: ...lease read the instruction manual carefully and keep it for reference this product is a test instrument for high voltage electrical equipment Please operate according to the operation instructions and...

Страница 3: ...gy 2 III technical parameters of series products 3 IV Product features 4 V Instrument structure and function description 5 VI Power cable withstand voltage test method 15 VII Transportation and preser...

Страница 4: ...mings 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 equipme...

Страница 5: ...m Commission has formulated the industry standard of ultra low frequency 0 1Hz withstand voltage test method for 35kV and below XLPE insulated power cables In 2004 the industry standard DL T 849 4 200...

Страница 6: ...5 5 F 80kV 0 1Hz 1 1 F 80KV 0 5 20A Controller 4Kg 0 05Hz 2 2 F Peak Value booster 50Kg 0 02Hz 5 5 F Compare content Power frequency withstand voltage Frequency withstand voltage 0 1Hz withstand volt...

Страница 7: ...se earth capacity of different types of generators Steam turbine generator Hydro generator Capacity MW 200 300 600 85 125 150 300 400 Single phase ground capacitance uF 0 198 0 18 0 26 0 31 0 34 0 69...

Страница 8: ...automatic storage automatic printing Large test range 0 1Hz 0 05Hz and 0 02hz multi frequency selection largetest range Small volume and light weight it is very convenient for outdoor operation Upper...

Страница 9: ...ed to communicate with the upper computer Stop for emergency stop test 2 Structure diagram of booster Figure 2 Schematic diagram of booster structure Operation instructions 1 Ultra low frequency outpu...

Страница 10: ...After the microcomputer is powered on or reset the instrument will automatically enter the interface as shown in Figure 4 When connecting wires removing wires or temporarily not using the instrument t...

Страница 11: ...ge limit it will no longer boost voltage and maintain constant amplitude sine wave output at this peak value Set voltage limit the setting range of voltage protection value is from 0 to rated value an...

Страница 12: ...not connected in the status bar of Figure 6 indicates that the booster or capacitive test sample is not connected Figure 6 the controller indicates that the load is not connected 2 Boosting process A...

Страница 13: ...ut Figure 8 constant amplitude output of controller prompt 4 Downtime When the timing reaches the set time the instrument will stop automatically as shown in Figure 9 and the prompt message in the sta...

Страница 14: ...own as shown in Figure 11 the prompt message in the status bar is test passed and the data history is saved Note during the test if there is no abnormal voltage no discharge or overcurrent protection...

Страница 15: ...ess of test when the output high pressure exceeds the set limit the instrument will automatically cut off the output after starting and shutting down the command and then execute the data history savi...

Страница 16: ...nt key in Figure 3 to print the data on the display into a test report Under the status of viewing historical data click the print key to print the historical data currently displayed on the screen 5...

Страница 17: ...to open the setting interface in Figure 15 which is used to set the date and time of the system 3 Upper computer background management software This instrument is equipped with VLF super low frequenc...

Страница 18: ...e setting value of 0 1Hz ultra low frequency test voltage of various rubber and plastic insulated power cables Table 4 0 1Hz ultra low frequency test voltage and time of various rubber plastic insulat...

Страница 19: ...ltage unit kV Example 2 a 10KV UN 10kV uo 8 7kv cable is 4km long with a single phase to ground capacitance of 0 21uf km and 0 1Hz super If the low frequency test voltage is 26kv peak value the leakag...

Страница 20: ...quired to turn on and power on once a month about two hours to make the moisture emission and protect the components 4 anti exposure When the instrument is used outdoors direct sunlight exposure shall...

Страница 21: ...ke the printing paper stretch out from the paper outlet put it in the middle position and let the rubber shaft fully press the printing paper otherwise it can t be printed When the thermal printer is...

Страница 22: ...19 X Packing List No Name Qty 1 Controller 1 2 Booster 1 3 HV Cable 2 4 LV Cable 1 5 Power Cable 1 6 Discharge Rod 1 7 Grounding Wire 1 8 Capacitor 1 9 Fuse 4 10 Print Paper 2...

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