Power tester UHV-702

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Product overview
The UHV-702 is a portable three-phase relay protection tester kit designed for on-site verification, calibration and automated protection tests. It features 4-phase voltage and 3-phase current outputs, a 320×240 dot-matrix LCD and an ergonomic rotary controller for standalone operation; connecting to a PC (Windows software, Chinese interface) enables advanced automated sequences, data storage and report printing.

Key features

• Standard outputs: 4-phase voltage and 3-phase current; single-phase voltage up to 120 V; single-phase current up to 40 A (10 s); three-phase parallel current up to 120 A; configurable fourth-phase Ux (3U0 / sync‑check / user‑defined).
• Standalone operation: large LCD and rotary mouse controller for immediate field verification without a PC.
• Dual modes: standalone and PC-connected operation with Windows software for automated test plans, scanning of protection settings and real-time data logging.
• Advanced test functions: three-phase differential, fast bus transfer, backup auto‑reclose, sync checks, fault playback, vector display and waveform plotting.
• Digital I/O: contact inputs compatible with 0–250 V, auto‑identification, 7 inputs and 2 pairs dry contact outputs; I/O expandable.
• Safety and reliability: optimized cooling, soft‑start, fault self‑diagnosis and automatic lockout.
• Auxiliary DC outputs: dedicated 110 V and 220 V DC outputs for auxiliary supply during tests.

Technical parameters — AC current output

• Output precision: 0.2 class
• Phase current (RMS): 0–40 A
• Three-phase parallel current (RMS): 0–120 A
• Long‑term permissible phase current (RMS): 10 A
• Max phase output power: 450 VA; three‑phase parallel max power: 900 VA (max 10 s)
• Frequency range (fundamental): 0–1000 Hz (online), 0–300 Hz (standalone)
• Harmonics: up to 20th (online), up to 6th (standalone)

Technical parameters — DC current output

• Output precision: 0.5 class
• Output current: 0–±10 A/phase, 0–±30 A (parallel)
• Maximum load voltage: 20 V

Technical parameters — AC voltage output

• Output precision: 0.2 class
• Phase voltage (RMS): 0–120 V
• Line voltage (RMS): 0–240 V
• Phase/line output power: 80 VA / 100 VA
• Frequency range (fundamental): 0–1000 Hz (online), 0–300 Hz (standalone)

Technical parameters — DC voltage output

• Output precision: 0.5 class
• Phase voltage amplitude: 0–±160 V
• Line voltage amplitude: 0–±320 V
• Phase/line output power: 70 VA / 140 VA

Switch quantity and time measurement

• Switching inputs: 8 channels; open contact detection 1–20 mA, 24 V; potential contact access: "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; resolution/accuracy 0.1 ms

Advantages

• Precise outputs suitable for protection calibration
• Comprehensive test functions including automated sequences
• Portable form factor for field use
• Clear local operation with large LCD and rotary controller
• Expandable I/O and PC integration for advanced workflows

Application fields

• Power systems: line protection verification, main transformer differential tests, excitation control testing and fault simulation.
• Manufacturing and utilities: R&D, production QC, calibration and maintenance of protection devices.
• Research and education: laboratory verification and teaching of relay protection principles.
• Special systems: traction, railway and aviation protection testing.

FAQ (summary)

• Use near live equipment: not permitted; connect only after the tested equipment is fully de-energized, verified and grounded.
• Battery life: approx. 4–6 hours continuous when fully charged; use backup battery or external adapter for extended field work.
• Temperature influence: operate mainly within 5 ℃ to 40 ℃; extremes may affect measurements.
• Definition of "fixed value": configured relay protection parameters such as pickup current and time delay that determine device action.

Technical specifications

• Model: UHV-702
• Manufacturer/Brand: Wuhan UHV Power Technology Co.,Ltd.
• Display: 320×240 dot-matrix LCD
• AC current output: phase 0–40 A; three-phase parallel 0–120 A
• AC voltage output: phase 0–120 V; line 0–240 V
• DC outputs: phase 0–±160 V; line 0–±320 V
• Output precision: AC 0.2 class; DC 0.5 class
• Frequency range: online up to 1000 Hz; standalone up to 300 Hz
• Digital I/O: 7 contact inputs (0–250 V compatible), 2 pairs dry contact outputs (expandable)
• Auxiliary DC outputs: 110 V and 220 V
• Time measurement: 0.1 ms–9999 s; accuracy 0.1 ms