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Electrical Test Equipment · Test Load Impedance Device
DC Impedance Device
AT series DC impedance is used as load and current-limiting equipment for DC rectifier systems, DC power supplies and DC distribution systems. Composed of adjustable DC resistors, DC reactors or R-L combinations, it covers 48V-3000V DC with current up to 20kA. Suitable for rectifier factory tests, DC power supply tests, electrolysis system commissioning, battery discharge tests and DC switchgear tests.
Application
AT series DC impedance is a load device for DC test systems and DC electrical equipment testing. It provides adjustable DC-side load impedance to simulate actual operating conditions, dissipate excess energy and limit short-circuit current. Widely used for:
Rectifier transformer and rectifier unit factory test loads
DC power supply performance testing
Electrolysis and electroplating DC system commissioning and aging tests
DC switchgear and DC circuit breaker high-current tests
Battery pack discharge testing and capacity verification
DC motor and traction converter test loads
DC-side testing for PV/energy storage systems
Structural Features
DC-specific design: Winding and insulation structure designed for DC voltage and current, withstanding DC electric field distribution and long-term DC bias
R-L combination options: Pure resistance, pure reactance or R-L combination to meet different DC system requirements for current ripple and power factor
High-current low-inductance design: Low-inductance resistors for rectifier testing to minimize current ripple effects
Multi-tap continuous adjustment: Manual, electric or programmable adjustment of current and resistance values
Forced heat dissipation: Forced air or water cooling for high-current DC operation to ensure long-term stable operation
Insulation monitoring and protection: Over-temperature, over-current, grounding and insulation monitoring protection
Selection Guide
Rectifier factory test: Choose low-inductance resistive load, continuous duty, current matching rectifier rated DC current
DC switchgear test: Choose short-time high-current load, 1-3s duty, current matching switchgear rated short-time withstand current
Battery discharge test: Choose pure resistive load, continuous duty, voltage matching battery pack voltage
Electrolysis/electroplating commissioning: Choose R-L combination load to simulate actual cell load characteristics
Traction converter test: Choose high-current low-inductance load with cooling system
Continuous operation: Choose water cooling or strong forced air cooling to avoid overheating
Multi-voltage compatibility: Choose wide voltage range adjustable solution to improve equipment utilization
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