Network tester UHV-802

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Product introduction
The UHV-802 is a three-phase relay tester designed for secondary current injection testing and relay protection verification. It integrates an industrial control computer running Windows, a 6.4" TFT color display, trackball and optimized panel keyboard for standalone field operation or external PC control.

Key features

• Flexible outputs: standard 4-phase voltage and 3-phase current outputs; phase current 0–40 A, three-phase parallel up to 0–120 A; phase voltage 0–120 V, line voltage 0–240 V.
• High-fidelity linear amplifiers (non-switching) for clean waveforms and low distortion across current ranges.
• DSP-controlled host with fast real-time processing, wide frequency range (0–1000 Hz) and high-resolution D/A conversion.
• Dual operation modes: standalone with built-in keyboard/mouse or controlled from an external PC via USB/RS232/Ethernet.
• Integrated adjustable DC auxiliary outputs (110 V and 220 V) and comprehensive I/O including switching inputs/outputs and time-measurement channels.

Advantages for test engineers

• Accurate signal generation and measurement using DSP and high-precision ADC for reliable protection testing.
• Automated test sequences, fault replay and report generation to reduce manual steps and documentation time.
• Portable, single-unit design suited to field commissioning, maintenance and troubleshooting.
• Extensive self-protection functions (thermal, hardware and software diagnostics) to protect equipment and test integrity.

Application scenarios

• Commissioning and factory acceptance testing of protection relays and protection schemes.
• Routine maintenance and calibration of relays in substations, power plants and industrial sites.
• Fault simulation and troubleshooting, including staged fault replay and vector diagram analysis.

Product details — electrical outputs

AC current output
Phase current (RMS): 0–40 A
Output precision: 0.2°
3-phase parallel current (RMS): 0–120 A
Long-time phase current rating: 450 VA
Max output power (3 parallel): 900 VA
Max permitted working time (3 parallel): 10 s
Frequency range (fundamental): 0–1000 Hz
Harmonic order: 0–20

DC current output
Output current: 0–±10 A per phase; 0–±30 A (3 parallel)
Output precision: 0.5°
Max output load voltage: 20 V

AC voltage output
Phase voltage (RMS): 0–120 V
Output precision: 0.2°
Line voltage (RMS): 0–240 V
Phase/Line output power: 80 VA / 100 VA
Frequency range (fundamental): 0–1000 Hz
Harmonic order: 0–20

DC voltage output
Phase voltage range: 0–±160 V
Output precision: 0.5°
Line voltage range: 0–±320 V
Phase/Line output power: 70 VA / 140 VA

Switching I/O and time measurement
Switching inputs: 8 channels (dry contact 1–20 mA, 24 V). Potential contact: "0": 0–+6 V; "1": +11 V–+250 V
Switching outputs: 4 pairs (DC: 220 V/0.2 A; AC: 220 V/0.5 A)
Time measurement: range 0.1 ms–9999 s; accuracy 0.1 ms

FAQ (selected)

• Q: Why perform periodic relay testing? A: To detect aging, parameter drift and ensure correct operation of protection devices.
• Q: What distinguishes microprocessor-based testers? A: DSP/microprocessor control enables higher accuracy, automation and complex fault simulation.

Technical specifications

• Model: UHV-802
• Display: 6.4" TFT true color
• Embedded OS: Windows (English interface)
• Interfaces: USB, RS232, Ethernet 10/100 M
• AC current per phase: 0–40 A; 3-phase parallel: 0–120 A
• AC voltage phase: 0–120 V; line: 0–240 V
• DC outputs: current ±10 A/phase, ±30 A (3 parallel); voltage ±160 V phase, ±320 V line
• Frequency range: 0–1000 Hz; harmonics: 0–20
• Time measurement: 0.1 ms–9999 s; accuracy 0.1 ms