Temperature testing device DDL

fully-automaticcomputer-controlledcircuit breaker

Product Overview
The DDL series fully automatic temperature-rise test device is an automated high-current test system engineered for temperature-rise testing of high-voltage switches and for high-current electrical commissioning. The system integrates automated control, measurement and PC-based data display, providing supply voltage, output current and active power readouts with accuracy class 0.5. Test duration and reminders are programmable for unattended sequences.

Applications

• Temperature-rise testing and high-current electrical commissioning for power plants, substations, electrical equipment manufacturers, research institutes and test laboratories.

Key features

• Automatic current regulation: deviations from the set current are compensated automatically and separately.
• Electrical control of voltage rise and fall to regulate output current; control accuracy selectable as an option.
• Zero-start protection function to prevent unsafe starts.
• Supply voltage and output current displayed via PC software with accuracy class 0.5; real-time active power monitoring.
• Independent programmable test time with reminder/alarm function.
• Designed for intermittent/short-duration operation with easy maintenance.

Technical 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
• Oil-immersed induction voltage regulator — output voltage: 0–430 V
• Oil-immersed induction voltage regulator — output current: 0–166 A
• Waveform distortion (voltage regulator): ≤ 3%
• Starting voltage (voltage regulator): ≤ 1%
• Short-circuit impedance (voltage regulator): ≤ 7%
• Dry-type current booster — rated capacity: 63 kVA
• Dry-type current booster — output line voltage: 10 V
• Dry-type current booster — output current: 0–6300 A
• Dry-type current booster — rated input voltage: 380 V
• No-load loss (current booster): < 4%
• Rated input current (current booster): 166 A
• Short-circuit impedance (current booster): ≤ 5%
• Cooling method (current booster): dry-type, air-cooled

Precautions

• On opening the cabinet, inspect electrical components and contact points for transport damage or poor contact.
• Before use, ensure correct contact of all electrical devices, with special attention to the voltage regulator brush/contact.
• Follow applicable operating procedures strictly; unauthorized operation or operation without qualified supervision is prohibited.
• Store the equipment in a well ventilated, dry area free of corrosive gases.