AC power supply current source HZ5373

ACprogrammable

Overview
HZ5373 is a 3000A primary current injection test set (upconverter) designed for primary bus protection testing and current transformer ratio verification. It integrates CNC processing, a self-coupling low-power high-capacity voltage regulator and a high-permeability iron-core converter to deliver rated output power in a compact, transportable enclosure.

Features

• Compact chassis with PVC front panel for field use.
• Panel displays for primary and secondary values to simplify observation and recording.
• Measurement accuracy: practical accuracy ~0.3 (declared better than 0.5 level).
• High output power with strong load capacity; continuous AC output to rated current.
• Reduced volume and weight (approx. 30%–70% of comparable units) for easier transport.
• 6.5-digit LCD for voltage/current and 128×64 dot-matrix LCD for system data.
• Indicator display lock for stable readings during ratio tests.
• Automatic transformer polarity detection and automatic ratio detection.
• Self-locking (locking) function and standard protection circuits.

Main functions and working principle

• Measurement circuitry includes current measurement loop and polarity loop; optional voltage measurement loop (PT-isolated) available.
• Current measurement: low-impedance CT, program-controlled amplifier and sampling circuits.
• Digital control: 16-bit MCU with real-time acquisition comparing measured values to settings for timing and protection actions.
• Output waveform: standard sine wave, distortion and ripple coefficient < 0.3%.
• Output mode: true RMS continuous adjustable current with high stability (0.2%).
• Protections: overcurrent and overvoltage protection functions integrated.

Operating notes / Method of operation

• Verify wiring and connector contacts before powering the unit.
• If abnormal conditions occur at startup (no display, smoke, burning smell), immediately disconnect mains and inspect wiring.
• Ensure current output terminal forms a closed loop; otherwise no current will be generated.
• Use external copper conductors sized at least 10 A/mm²; standard supply includes two 3 m test leads.
• Designed for short-term output: five minutes short-term duty; for batch testing keep duty cycles < 2.5 minutes; plan thermal conditions for prolonged tests.
• Operation sequence: set current knob to zero → connect primary/secondary as required → power on → enable power control → increase current via adjustment knob → read primary/secondary meters for ratio calculation. For impulse tests, set required current and use impact switch as procedure dictates.

Packing list

• Main high current generator unit — 1
• High current test leads — 2
• Power cable — 1

Notes / Technical specifications

• Model: HZ5373 (3000 A high current generator).
• Environmental grouping: Group III per GB6587.1-86 (suitable for some outdoor use).
• Input voltage: AC 380 V ±10%.
• Rated power: 30 kVA.
• Output current: AC 0–3000 A, stepless adjustable; panel digital ammeter.
• Output voltage: typically >10 V under operating conditions.
• Output waveform: sine wave; ripple < 0.3%.
• Measurement accuracy: practical ~0.3 (using 0.2S grade materials); system accuracy better than 0.5.
• Current stability: 0.2%.
• Protection: overcurrent and overvoltage protection integrated.