Insulating oil hipot tester YDJ

DChigh-voltageportable

Product Introduction
The YDJ Pointer 5kVA Oil-Immersed AC Test Transformer is a traditional high-voltage testing device that utilizes oil insulation to deliver stable AC withstand voltage tests on electrical equipment. With a 5kVA capacity, it is well-suited for testing medium-sized apparatus such as transformers and cables. The pointer-style analog interface provides clear, real-time readings of voltage and current. The oil-immersed design ensures effective heat dissipation and reliable insulation performance, making this classic tester an ideal choice for industrial and laboratory applications that demand robust dielectric strength validation.

Product Characteristics

• Superior Material & Reliable Quality – Carefully selected materials ensure reliable quality and excellent operational stability.
• High Voltage Margin & Low Partial Discharge – Designed with a large voltage margin, a compact corona ring, and minimal partial discharge levels for enhanced performance.
• Compact & Lightweight Design – Advanced insulation materials reduce footprint and weight for improved portability.

Technical Parameters (summary)
Technical parameters vary by model. See the specifications section below for detailed model-by-model parameters.

Comparison of Advantages and Disadvantages of Various Test Transformers

• Oil immersed test transformer — Advantages: strong insulation performance suitable for high voltage levels; high heat dissipation efficiency enabling long-term continuous operation; low cost and mature technology. Disadvantages: large volume and heavy weight; requires regular maintenance (oil changes, leak detection); risk of oil leakage and limited use in environments with strict environmental requirements.
• Dry type test transformer — Advantages: small size and light weight; no oil leakage risk and easier outdoor use; easier maintenance. Disadvantages: insulation performance sensitive to humidity; limited heat dissipation not suitable for long-term high load; higher cost in high-voltage scenarios.
• Inflatable test transformer — Advantages: high insulation strength with miniaturized design; strong anti-pollution ability and low partial discharge. Disadvantages: high cost, requires strict gas handling and monitoring; maintenance requires professional equipment and high technical threshold.

Main application scenarios

• Power system testing: testing transformers, switchgear, relays, and transmission lines with high-voltage/high-current parameters to evaluate performance under load and overload conditions.
• Insulation material testing: voltage withstand tests for cables, insulators and transformer windings to verify reliability and safety under real working conditions.
• Voltage withstand testing: partial discharge and leakage current tests to evaluate equipment insulation level and compliance with safety standards.
• Fault simulation testing: short circuit, overvoltage and frequency response testing to check stability and protection performance under fault conditions.
• Electronic device testing: performance evaluation of components or circuits in liquid media or immersion conditions.
• Mechanical engineering applications: testing mechanical components in lubricating or hydraulic oil environments to simulate wear and friction.
• Materials science research: testing corrosion resistance or high temperature resistance in closed oil-immersion environments.
• Automotive industry applications: evaluating components that must withstand lubricating oils or preservatives.
• Medical equipment testing: simulating immersion conditions for compatibility and reliability assessment.

Frequently Asked Questions

• Q: What is the most easily overlooked fatal detail before operation? Answer: The shell and iron core must be grounded at one point and the grounding resistance should not exceed 0.5 Ω. Ensure the X terminal of the low-voltage winding (input side) is connected; otherwise measurements on the high-voltage side may be inaccurate and the instrument may be prone to breakdown. Also check the insulation oil level; if the oil level is too low, the high-voltage lead may be exposed to air and the boost must be discharged.
• Q: The voltage cannot rise during the experiment, but the voltage regulator has reached its maximum. Why? Answer: Common reasons include large voltage drop in the power supply line (wire diameter too thin or distance too far), severe breakdown of the insulation of the test sample causing a short circuit (causing a sharply increased leakage current), or poor contact of the carbon brush or broken winding of the voltage regulator.

Caractéristiques / spécifications techniques

• YDJ-3/50 — capacity: 3 kVA; High Voltage: 50 kV; High-tension current: 60 mA; Low input: 200 V, 15 A; Ratio of transformation: 500; Temperature rise (30 min): 10 ℃.
• YDJ-5/50 — capacity: 5 kVA; High Voltage: 50 kV; High-tension current: 100 mA; Low input: 200 V, 25 A; Ratio of transformation: 500; Temperature rise (30 min): 10 ℃.
• YDJ-10/50 — capacity: 10 kVA; High Voltage: 50 kV; High-tension current: 200 mA; Low input: 200 V, 50 A; Ratio of transformation: 500; Temperature rise (30 min): 10 ℃.
• YDJ-20/50 — capacity: 20 kVA; High Voltage: 50 kV; High-tension current: 400 mA; Low input: 200 V, 50 A; Ratio of transformation: 500; Temperature rise (30 min): 10 ℃.
• YDJ-30/50 — capacity: 30 kVA; High Voltage: 50 kV; High-tension current: 600 mA; Low input: 400 V, 50 A; Ratio of transformation: 500; Temperature rise (30 min): 10 ℃.
• YDJ-50/50 — capacity: 50 kVA; High Voltage: 50 kV; High-tension current: 1000 mA; Low input: 400 V, 125 A; Ratio of transformation: 500; Temperature rise (30 min): 10 ℃.
• YDJ-5/100 — capacity: 5 kVA; High Voltage: 100 kV; High-tension current: 50 mA; Low input: 200 V, 25 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-10/100 — capacity: 10 kVA; High Voltage: 100 kV; High-tension current: 100 mA; Low input: 200 V, 25 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-10/25 — capacity: 10 kVA; High Voltage: 25 kV; High-tension current: 400 mA; Low input: 400 V, 25 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-20/100 — capacity: 20 kVA; High Voltage: 100 kV; High-tension current: 200 mA; Low input: 200 V, 50 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-30/100 — capacity: 30 kVA; High Voltage: 100 kV; High-tension current: 300 mA; Low input: 200 V, 75 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-50/100 — capacity: 50 kVA; High Voltage: 100 kV; High-tension current: 500 mA; Low input: 400 V, 125 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-15/150 — capacity: 15 kVA; High Voltage: 150 kV; High-tension current: 100 mA; Low input: 400 V, 37.5 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-20/150 — capacity: 20 kVA; High Voltage: 150 kV; High-tension current: 133 mA; Low input: 400 V, 50 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-30/150 — capacity: 30 kVA; High Voltage: 150 kV; High-tension current: 200 mA; Low input: 400 V, 75 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-50/150 — capacity: 50 kVA; High Voltage: 150 kV; High-tension current: 333 mA; Low input: 400 V, 125 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-100/150 — capacity: 100 kVA; High Voltage: 150 kV; High-tension current: 667 mA; Low input: 400 V, 250 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-50/200 — capacity: 50 kVA; High Voltage: 200 kV; High-tension current: 250 mA; Low input: 400 V, 125 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-100/200 — capacity: 100 kVA; High Voltage: 200 kV; High-tension current: 500 mA; Low input: 400 V, 250 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-150/200 — capacity: 150 kVA; High Voltage: 200 kV; High-tension current: 750 mA; Low input: 400 V, 375 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-200/200 — capacity: 200 kVA; High Voltage: 200 kV; High-tension current: 1000 mA; Low input: 400 V, 500 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-300/200 — capacity: 300 kVA; High Voltage: 200 kV; High-tension current: 1500 mA; Low input: 400 V, 750 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-50/300 — capacity: 50 kVA; High Voltage: 300 kV; High-tension current: 170 mA; Low input: 400 V, 125 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-100/300 — capacity: 100 kVA; High Voltage: 300 kV; High-tension current: 333 mA; Low input: 400 V, 250 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-150/300 — capacity: 150 kVA; High Voltage: 300 kV; High-tension current: 500 mA; Low input: 400 V, 375 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-200/300 — capacity: 200 kVA; High Voltage: 300 kV; High-tension current: 667 mA; Low input: 400 V, 500 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.
• YDJ-300/300 — capacity: 300 kVA; High Voltage: 300 kV; High-tension current: 3000 mA; Low input: 400 V, 750 A; Ratio of transformation: 1000; Temperature rise (30 min): 10 ℃.