What Is the AC High-Voltage Inflatable Test Transformer 20kVA?

The AC High-Voltage Inflatable Test Transformer 20kVA is a portable and clean solution for high-voltage testing. It suits on-site tests and laboratory use. The brand is Wrindu, made in Shanghai, China.

Why Choose This Test Transformer?

• Small size and light weight

• 40%–65% lighter than oil-immersed transformers

• Clean design with no oil

• No daily maintenance required

• Works well in bad weather

• Supports on-site testing without standing installation

• High insulation strength

• Very low corona discharge

What Are the Main Technical Parameters?

• Rated capacity: 20 kVA

• Low-voltage side:

  • Voltage: 400 V

  • Current: 50 A

• High-voltage side:

  • Voltage: 100 kV

  • Current: 200 mA

• Measurement ratio: 1000:1

• Temperature rise: ≤ 50 ℃

Technical Parameters

Item	Parameter
Rated Capacity	20 kVA
Low Voltage Side – Voltage	400 V
Low Voltage Side – Current	50 A
High Voltage Side – Voltage	100 kV
High Voltage Side – Current	200 mA
Measurement Ratio	1000 : 1
Temperature Rise	≤ 50 ℃
Cooling / Insulation	Inflatable, oil-free
Maintenance	Not required

Standard Model Specifications

Capacity (kVA)	Low Voltage (V)	Low Current (A)	High Voltage (kV)	High Current (mA)	Measurement Ratio	Temp. Rise (℃)
6 / 50	200	30	50	120	500 : 1	50
10 / 50	200	50	50	200	500 : 1	50
15 / 50	400	37.5	50	300	500 : 1	50
20 / 50	400	50	50	400	500 : 1	50
30 / 50	400	75	50	600	500 : 1	50
50 / 50	400	125	50	1000	500 : 1	50
10 / 100	200	50	100	100	1000 : 1	50
15 / 100	400	37.5	100	150	1000 : 1	50
20 / 100	400	50	100	200	1000 : 1	50
30 / 100	400	75	100	300	1000 : 1	50
50 / 100	400	125	100	500	1000 : 1	50
10 / 150	200	50	150	66.7	1500 : 1	50
15 / 150	400	37.5	150	100	1500 : 1	50
20 / 150	400	50	150	133.3	1500 : 1	50
30 / 150	400	75	150	200	1500 : 1	50
50 / 150	400	125	150	333.3	1500 : 1	50
50 / 200	400	125	200	250	2000 : 1	50
50 / 300	400	125	300	166	3000 : 1	50

FAQs

Why Use Inflatable Over Other Types?

Feature	Inflatable (Gas)	Oil-Immersed	Dry Type
Weight	Very light	Heavy	Light
Price	Moderate	Economical	Expensive
Maintenance	Low (no oil leakage)	High (leakage risk)	Minimal
Corona	Very small	Small	Moderate
Best For	On-site / field tests	Fixed labs / high power	Indoor & environmentally sensitive areas

Which test transformer is better overall: dry-type, oil-immersed, or gas-insulated?

A: There is no single “best” option; the best choice depends on voltage level, environment, and maintenance needs.
Dry-type suits clean indoor use, oil-immersed fits cost-sensitive and outdoor testing, and gas-insulated works best for high and extra-high voltage applications.

Which test transformer is the easiest to maintain?

A: Dry-type test transformers are the easiest to maintain.
They use solid insulation and do not require oil checks or gas pressure monitoring. Only basic surface cleaning is needed.

Which test transformer is safest to use?

A: Dry-type test transformers offer the highest safety level.
They contain no oil or SF₆ gas, so there is no fire risk or gas leakage hazard.

Which test transformer works best for high-voltage or extra-high-voltage tests?

A: Gas-insulated test transformers are the best choice for high and extra-high voltage tests.
SF₆ gas provides excellent insulation strength and stable performance under extreme conditions.

Which test transformer has the lowest initial cost?

A: Oil-immersed test transformers usually have the lowest initial cost.
Their technology is mature, widely used, and economical for many standard testing applications.

Which test transformer performs best in harsh environments?

A: Gas-insulated test transformers perform best in harsh environments.
They tolerate high humidity, dust, and extreme temperatures better than dry-type or oil-immersed designs.

Which test transformer has the best heat dissipation?

A: Oil-immersed test transformers provide the best heat dissipation.
The insulating oil supports strong convection cooling, making them suitable for long-duration and high-load tests.

Which test transformer is most environmentally friendly?

A: Dry-type test transformers are the most environmentally friendly.
They use solid insulation, produce no leaks, and pose no pollution or greenhouse gas risks.

Are test results different between oil-immersed and gas-insulated transformers?

A: Yes, test results can differ slightly under the same accuracy level.
Oil offers better heat dissipation, while gas provides higher insulation strength, and environmental conditions also affect measurements.

Which test transformer is best for laboratories and indoor workshops?

A: Dry-type test transformers are ideal for laboratories and indoor workshops.
They require clean environments and offer compact size, low noise, and easy operation.

Which test transformer suits outdoor or temporary field testing?

A: Oil-immersed test transformers are well suited for outdoor or temporary testing.
They adapt well to temperature and humidity changes and handle higher loads at a lower cost.

How does the AC withstand voltage test device work?

A: It works by stepping up low-voltage AC power to high-voltage AC at power frequency.
A step-up transformer generates the voltage, and a voltage divider measures the output to verify insulation strength without breakdown.

Why is the AC withstand voltage test important?

A: It is essential for verifying insulation reliability and system safety.
The test detects defects caused by manufacturing issues, aging, or moisture before equipment enters service.

What is the key formula for selecting an AC withstand voltage test device?

A: The key formula is based on output current, capacity, and voltage.
Output current (mA) = Capacity (kVA) ÷ Output voltage (kV) × 1000, which helps match the device to the test requirements.

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