Description

Technical Parameters

Product Overview & Applications

Our company independently develops and produces lightweight AC and AC/DC dual-purpose oil immersed and gas filled (SF6) series transformers based on the national standard for test transformers and industry standard JB/T9641-1999. These transformers have the characteristics of small size, light weight, compact structure, complete functions, strong versatility, and easy use. It is particularly suitable for conducting insulation strength and leakage tests on various electrical equipment, electrical components, and insulation materials under power frequency or DC high voltage in power systems, industrial and mining enterprises, scientific research departments, etc. It is an essential and important equipment in high voltage testing.

The HMYDJ-50kVA/250kV boosting set is equipped with a single-phase transformer for this series of test transformers. The adjustable voltage of 0-400V is output to the primary winding of the test transformer through the voltage regulator (attached to the regulator above 100kVA) in the operation box (platform). According to the principle of electromagnetic induction, adjustable high voltage can be obtained in the secondary winding group.

Application:

1. Power Transformer Manufacturing Quality Control::Final factory testing of oil-filled power transformers before shipment

2.High-Voltage Bushing Production:Quality assurance for condenser bushings (110kV-1000kV)

3.Instrument Transformer Manufacturing:Testing oil-immersed current transformers (CTs) and voltage transformers (VTs)

4.Circuit Breaker and Switchgear Testing:Insulation verification for oil-circuit breakers and oil-filled switchgear

5.Cable Sealing End and Joint Manufacturing:Testing oil-filled cable terminations and joints for high-voltage cables

6.Industrial Reactor and Shunt Manufacturing:Quality control for oil-immersed smoothing reactors and shunt reactors

7.Repair and Refurbishment Workshops:Re-testing transformers after rewinding or major repairs

8.Renewable Energy Equipment:Testing step-up transformers for wind farms and solar plants

Features & Advantages

● 10-inch LCD display clearly and intuitively shows data including voltage, current, time, status information, and prompts;

● Fully Chinese interface with simple, straightforward operation suitable for diverse applications;

● Touchscreen operation with all functions pre-programmable, enhancing product safety and reliability;

● Status alert function with guided Chinese operation;

● Alarm function: Clamping alarm with 5-second audible alert; voltage signal acquisition anomaly triggers audible alarm;

● Emergency stop function: Enables instantaneous voltage increase/decrease halt during automatic control at any point;

● Automatic timing function: During automatic control, device automatically starts timing when voltage reaches set value; upon timing completion, device automatically reduces voltage and returns to zero position;

● Manual control mode: Similar to traditional electric voltage adjustment, with up/down control via touch buttons. Device automatically detects upper/lower limits. Features high-voltage overvoltage protection and low-voltage overcurrent protection.

● Combines hardware and software anti-interference technologies for stable performance and strong interference resistance.

operation Condition

Environmental temperature: -10--40 ℃
Altitude:<1000M
Relative humidity:<85%
There should be no gas, steam, chemical dust or other explosive and corrosive media that seriously affect insulation in the site of use.

Maintenance & FAQs

Q: : What is the main goal of the test?

To ensure the insulation between different parts of the equipment (e.g., between high-voltage windings and the grounded tank, or between phases) has no major flaws like cracks, impurities, or insufficient clearance. It's a pass/fail test for dielectric strength.

Q: When is this test performed?

This test is mandatory at three key stages:

Type Test:On the first unit of a new design to validate the insulation system.

Routine Test:On everyunit manufactured before it leaves the factory.

After Major Repair:Following a rewind or significant repair to ensure integrity is restored.

Q: What happens if the insulation fails the test?

The test is destructive for a faulty unit. Failure is a sudden "breakdown" or "puncture" of the insulation, resulting in a large current flow. This identifies a critical weakness that would have certainly failed in service, potentially causing a violent explosion and a major power outage.

Q: What does "Withstand" mean?

It means the insulation successfully endured the high voltage for the full duration (typically 60 seconds) without breaking down. The equipment "passed" the test.

Q: Is this test dangerous?

Yes, extremely. It involves lethal high voltages and large amounts of flammable insulating oil. It must only be conducted by trained personnel in a controlled environment (factory or specialized lab) following strict safety protocols, including grounding and safety barriers.

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● Rated Capacity: 50kVA

● Low-Voltage Current: 0–116.3A

● Low-Voltage Voltage: 0–430V

● High-Voltage Voltage: 0–250kV

● High-Voltage Current: 0–0.2A

● Instrument Voltage: 0–100V

● Voltage Measurement Accuracy: 0.5% FS ±3 digits

● Current measurement accuracy: 0.5% FS ±3 digits

● Overall accuracy: 4%

● Timing range: 0 to 999.9 M (special mode supports extended operation)

● Power supply voltage: AC380V ±10%; 50Hz ±2 Hz

● Operating environment: Ambient temperature 0 to 50°C; Relative humidity ≤85%RH