AC power supply current source DDG-5000A

AC

Product Introduction
DDG primary current injectors are primary current injection test sets and high-current generators designed for commissioning, testing and diagnostic work in power systems, substations, manufacturers and laboratories. Available in integrated or split configurations, DDG models cover output ranges from 500 A to 10000 A and capacities from 3 kVA to 60 kVA.

Product Characteristics

• Dual ammeters for multi-range current monitoring and accurate reading across test ranges.
• Continuously adjustable autotransformer for precise output control.
• Simple push-button control with status indicator lights for clear operation feedback.
• Modular design: integrated units for lower currents and split (fission) versions for high-current, easy transport and heat dissipation.

Function and Features

• Output capability: continuous high-current output for limited durations or short-term maximum output as required by test protocols.
• Testing scope: verification of thermal relays, switches, transformers, AC contactors and protection circuits; direct measurement of CT transformation ratio and polarity; timing of switching actions.
• Safety functions: grounding detection and zero-return detection block tests until safe conditions are confirmed; over-limit protection triggers motor return to zero and audible/visual alarm.
• EMC robustness: combined hardware and software anti-interference measures for stable operation in harsh environments (high temperature/humidity, marine, cold, high altitude).
• Diagnostics and options: automatic error diagnosis, optional remote communication, door-lock alarm, voltage verification interface.
• Portability: compact dimensions for low-current models; split configurations for high-current units to facilitate handling and cooling.

Application Fields

• Short-circuit testing of power transformers, circuit breakers, isolating switches and current transformers to verify dynamic and thermal stability.
• Relay protection verification by providing calibrated high-current signals to protection relays.
• Equipment aging assessment and lifetime testing under controlled high-current stress.
• Motor overload capacity tests during production and quality control.
• Generator performance testing under simulated load conditions.
• R&D validation and type testing of electrical equipment.
• Teaching and laboratory experiments in universities and vocational schools.

Technical parameters (special parameters can be customized)

• DDG-500: Capacity 3 kVA; Primary V1 220 V / A1 15 A; Secondary V2 6 V / A2 500 A; Output 500 A; Dimensions 430×338×550 mm; Weight 48 kg; Structure: integrated.
• DDG-1000: Capacity 6 kVA; Primary 220 V / 27 A; Secondary 6 V / 1000 A; Output 1000 A; Dimensions 500×380×600 mm; Weight 80 kg; Structure: integrated.
• DDG-2500: Capacity 15 kVA; Primary 380 V / 39.5 A; Secondary 6 V / 2500 A; Output 2500 A; Dimensions 600×430×790 mm; Weight 145 kg; Structure: integrated.
• DDG-4000: Capacity 24 kVA; Primary 380 V / 63 A; Secondary 6 V / 4000 A; Output 4000 A; Dimensions 640×450×820 mm; Weight 180 kg; Structure: integrated or split.
• DDG-5000: Capacity 30 kVA; Primary 380 V / 79 A; Secondary 6 V / 5000 A; Output 5000 A; Dimensions 600×430×900 mm & 300×500×500 mm; Weight 145 kg & 135 kg; Structure: split.
• DDG-6000: Capacity 36 kVA; Primary 380 V / 95 A; Secondary 6 V / 6000 A; Output 6000 A; Dimensions 600×430×900 mm & 300×500×500 mm; Weight 150 kg & 140 kg; Structure: split.
• DDG-8000: Capacity 48 kVA; Primary 380 V / 126 A; Secondary 6 V / 8000 A; Output 8000 A; Dimensions 600×450×950 mm & 350×550×550 mm; Weight 180 kg; Structure: split.
• DDG-10000: Capacity 60 kVA; Primary 380 V / 158 A; Secondary 6 V / 10000 A; Output 10000 A; Dimensions 800×600×1100 mm & 380×550×600 mm; Weight 200 kg; Structure: split.

Frequently Asked Questions (summary)

• How to choose current level: select based on rated current of the equipment under test; typically ~1.2× rated current for stable verification.
• Operation duration: most models intended for short-term or intermittent testing; for continuous tests choose forced-cooling or higher-capacity models.
• Output stability: regulated autotransformer and control circuitry provide smooth, stable current output suitable for precision testing.
• Safety: units include overcurrent, overheating and short-circuit protections; grounding and zero-return checks prevent unsafe tests.
• Portability: integrated units for ≤1000 A; split designs for higher currents to ease transport and cooling requirements.
• Maintenance: routine inspection of terminals, cleaning and ensuring ventilation/heat dissipation.

Specifications / technical characteristics

• Series: DDG series (models DDG-500 to DDG-10000).
• Capacity range: 3–60 kVA.
• Primary voltage: typically 220 V or 380 V depending on model.
• Secondary voltage: typically 6 V.
• Output current range: 500–10000 A depending on model.
• Structure: integrated (single unit) or split/fission for high-current models.