AC power supply current source DDL

programmableAC

Product introduction The DDL series fully automatic temperature-rise test device is designed for high-current electrical commissioning and temperature-rise testing of high-voltage switchgear. Intended for power plants, substations, electrical equipment manufacturers, research institutes and test laboratories, the system is built for short-term or intermittent operation and integrates into industrial test workflows.

Product features

• Automatic current deviation compensation after the set value is applied.
• Electrical control of voltage rise/fall to regulate output current; control accuracy configurable.
• Zero-start protection to prevent unsafe starts.
• Power supply and output current displayed via PC software with 0.5 class accuracy.
• Independent experiment time setting with audible/visual reminder and automatic stop.

Technical parameters
Key specifications
Input voltage: Three-phase four-wire AC 380 V
Rated frequency: 50 Hz
Total system power: 189 kW
Total system current: 287 A
System power factor: cosφ = 0.8

Oil-immersed induction voltage regulator
Rated capacity: 63 kVA
Output voltage: 0–430 V
Output current: 0–166 A
Waveform distortion: ≤3%
Starting voltage: ≤1%
Short-circuit impedance: ≤7%

Dry-type current booster
Rated capacity: 63 kVA
Output line voltage: 10 V
Output current: 0–6300 A (model dependent)
Rated input voltage: 380 V
No-load loss: <4%
Rated input current: 166 A
Short-circuit impedance: ≤5%
Cooling method: Dry-type, air-cooled

Equipment functions and practical features

• Continuous, stepless current adjustment for both small-current terminals and large busbars using the same equipment.
• Multi-channel thermocouples synchronously acquire temperature data and display multi-point temperature-rise curves in real time.
• Preset test duration per national standard; system reduces current and stops automatically at end of test, eliminating need for constant supervision.
• Smooth current ramp-up without impact currents, avoiding instantaneous high-current damage to contact surfaces.
• Air-cooled cabinet with controllable temperature for reliable long-duration full-load testing and batch operation.

Application scenarios

• Switchgear manufacturers: batch temperature-rise testing of finished circuit breakers and bus ducts before shipment.
• Copper busbar processors: high-current conductivity and heating performance tests.
• Third-party test laboratories: type and factory tests of switchgear and isolating switches including temperature-rise items.

Precautions

• On unpacking, inspect electrical components and contacts for transport damage or poor contact.
• Before use, verify good contact of electrical devices, especially voltage regulator brushes/contacts.
• Follow operating procedures strictly; prohibit unauthorized operation or use without a safety supervisor.
• Store equipment in a ventilated, dry environment free of corrosive gases.

Frequently Asked Questions

• What is a fully automatic temperature-rise test device? An intelligent test system for power equipment temperature-rise testing providing high-current output, automated temperature acquisition, real-time monitoring, automatic control and test report generation.
• Does it support long-term continuous operation? Yes; the system uses high-power supply and efficient cooling to support extended continuous testing.
• What is the maximum output current? Output current is customizable by specification (examples: 500 A, 1 000 A, 3 000 A, 5 000 A, 10 000 A or higher).
• How many temperature points can be measured simultaneously? Channels are configurable (e.g., 8, 16, 32, 64 or more) for multi-point monitoring.
• How is stable output current ensured? High-precision constant-current control with automatic feedback regulation maintains stable current during tests.

Technical specifications / Features

• Model / Series: DDL series
• Input voltage: Three-phase four-wire AC 380 V
• Rated frequency: 50 Hz
• Total system power: 189 kW
• Total system current: 287 A
• Power factor: cosφ = 0.8
• Oil-immersed regulator: 63 kVA, 0–430 V, 0–166 A
• Dry-type current booster: 63 kVA, 10 V line, 0–6300 A output, air-cooled
• Control & display: PC software, 0.5 class accuracy; independent test timer; zero-start protection; automatic current regulation