Discription

HYJF-300KVA/300KV PD free Power frequency AC hipot test system:

This set of equipment is mainly used for conducting power frequency withstand voltage and partial discharge tests on test samples such as transformers, power transformers, high-voltage circuit breakers, and cable accessories, as well as for scientific research experiments.

Technical Details

Work condition

Territory height: ≤1000m

Ambient temperature: -20℃～+40℃

Relative air humidity: ≤90% (25℃)

The waveform of the power supply voltage is an actual sine wave, and the waveform distortion rate is <3%

Set up a reliable grounding point with grounding resistance <0.5Ω

Installation location: indoors

Power Frequency PD Test Transformer

Model： YDJ-300／300

Structure： Insulation Cylinder

PH：1ph

Frequency： 50Hz

Rated capacity：300kVA

Rated input voltage：0.6kV

Rated input current：500A

Rated output voltage：300kV

Rated output current: 1.0A

Output waveform distortion rate：≤3％

Power frequency hipot level：330kV/1min

Operating Time: Continuous operation for 5 minutes at rated voltage and rated current; continuous operation permitted at 2/3 rated voltage and 2/3 rated current.

Partial discharge level: ≤5 pC at rated voltage, ≤3 pC at 80% rated voltage

Cooling method： Oil-immersed self-cooling

Structure: Epoxy glass fiber winding for insulating casings

Temperature rise:＜45K

Impedance voltage: ＜10%

No load current: ＜6%

Voltage regulator

Model： TEDGC –300／0.38/0～0.65

Ph：1ph

Frequency：50Hz

Rated capacity：300kVA

Rated input voltage：0.38kV

Rated input current：789A

Rated output voltage：0～0.65kV

Rated output current：461A

Waveform distortion rate：＜3%

Initial voltage：≤1％

Running time： Operate at 1.1 times rated voltage for 1 minute; capable of continuous operation at rated voltage and rated current for 30 minutes.

Capacity divider(Coupling capacitor)

Model：TAWF－400/300

Rated Frequency：50Hz

Nominal capacitance：400pF

Rated voltage：300kV

Nominal divider ratio：3000:1

Measurement error: Including low-voltage arm, measurement cable, and digital voltmeter ≤0.5%

Partial Discharge Level: 100% Rated Voltage ≤ 3 pC, 80% Rated Voltage ≤ 2 pC

Structure Type: Insulated-enclosure oil-paper capacitor structure. Consisting of a top cover, a capacitor body, a movable base, a low-voltage arm, etc. The voltage divider can also function as a coupling capacitor for partial discharge measurement.

Protective resistor

Model： GR300－1.0/2

Rated Voltage：300kV

Rated current：1.0A

Nominal resistance：2kΩ

Partial Discharge Level: ≤3 pC at 100% rated voltage, ≤2 pC at 80% rated voltage

Structure Type: Nickel-chromium enameled wire is wound around an epoxy tube. Both ends are fitted with connecting tubes to link to the transformer's voltage divider. Shielding rings are installed at both ends. When the test specimen discharges, the protective resistor will not suffer insulation damage.

Controller

Model： AC-2000

5.1Function：

5.1.1 Meter accuracy：0.5level(HV measuring part)

5.1.2 with over-current protection

5.1.3 with hipot timer

5.1.4The voltage regulator employs a synchronous AC motor drive for voltage regulation and incorporates upper and lower protection functions along with zero-voltage disconnection protection.

5.1.5 The console is equipped with laboratory safety door protection.

5.1.6 Features zero-voltage closing and automatic return to zero upon specimen breakdown.

5.1.7 Incorporates a withstand voltage timing device; upon reaching the withstand time, the voltage regulator automatically drops to zero position.

5.1.8 Indicator：

(1) High-voltage output voltmeter, accuracy 0.5 grade

(2) High-voltage output ammeter, accuracy 0.5 grade

(3) Voltage meter for regulator output, accuracy 0.5 grade

(4) Ammeter for regulator output, accuracy 0.5 grade

(5) Equipped with power-on closing indication

(6) Equipped with a regulator reset indication

(7) Equipped with a set of control measurement cables

The system including below equipment