Sverker 750/760 Single-Phase Relay Test Set
| Origin | Imported |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Model | Sverker 750/760 |
| AC Current Output | 0–10 A (75 V full-load), 0–40 A (20 V), 0–100 A (8 V), 0–250 A (10 V, 1 s pulse) |
| AC Voltage Output | 0–250 V (3 A, 250 V full-load), 0–300 V AC (2 A) |
| Auxiliary AC/DC Voltage Outputs | 0–60 V AC / 60–120 V AC / 20–130 V DC / 130–220 V DC (all up to 0.4 A) |
| Timer Range | 0.000–999.9 s (±1 ms accuracy) |
| Current Measurement | Internal 0.00–200.0 A (±0.5%), External 0.000–6.000 A (±0.5%) |
| Voltage Measurement | 0.00–600.0 V (±0.5% for AC/DC) |
| Phase Angle Adjustment | 0–359° (±1° resolution) |
| Dimensions | 350 × 270 × 220 mm |
| Weight | 18 kg |
Overview
The Sverker 750/760 is a portable, single-phase relay test set engineered for precision verification and functional testing of electromechanical, static, and digital protective relays in utility substations, industrial power systems, and railway traction networks. It operates on the principle of controlled source injection—delivering calibrated, synchronized AC/DC voltage and current signals to simulate fault conditions and verify relay pickup, dropout, timing, and directional characteristics. Unlike multi-phase test sets, the Sverker 750/760 is optimized for efficiency in single-phase applications including overcurrent (OC), earth-fault (EF), voltage-restrained overcurrent (VROC), and single-pole auto-reclosing schemes. Its integrated architecture eliminates dependency on external meters or auxiliary timing devices, enabling fully self-contained commissioning and maintenance workflows under field-deployable constraints.
Key Features
- Integrated high-current AC output: up to 250 A peak (1-second pulse) and continuous 100 A at ≥8 V, supporting thermal and magnetic trip validation of inverse-time overcurrent relays per IEC 60255-3 and IEEE C37.112-2018.
- Dual-range AC voltage sourcing: 0–250 V (3 A) and 0–300 V AC (2 A), with independent auxiliary AC/DC outputs spanning 0–120 V AC and 20–220 V DC—enabling simultaneous excitation of tripping coils, auxiliary contacts, and VT/CT secondary circuits.
- Precision phase-angle control: 0–359° adjustable in 1° increments, facilitating directional element testing (e.g., quadrilateral or mho characteristics) without external synchro sources.
- Onboard metrology-grade measurement: built-in current meter (0.00–200.0 A internal, 0.000–6.000 A external), voltage meter (0.00–600.0 V), and timer (0.000–999.9 s) — all traceable to national standards with ±0.5% reading accuracy for AC/DC quantities and ±1 ms timebase stability.
- Hold-on-trip functionality: automatically freezes output and measurement values upon relay contact closure, enabling accurate determination of operate and reset thresholds without manual intervention.
- Ruggedized transport design: IP2X-rated enclosure, shock-absorbing rubber feet, and ergonomic carry handle; meets IEC 60068-2 environmental stress requirements for storage and operation across –10 °C to +50 °C ambient.
Sample Compatibility & Compliance
The Sverker 750/760 is validated for use with single-phase induction disc, solid-state, and microprocessor-based relays conforming to IEC 60255, IEEE C37.90, EN 50178, and UL 1053. Its output waveform fidelity (THD <1.5% at rated load) ensures compatibility with modern digital relays requiring clean sinusoidal stimulation. All measurement functions comply with IEC 61000-4-30 Class S for power quality instrumentation and support GLP/GMP-aligned calibration records per ISO/IEC 17025. The device includes configurable pass/fail criteria templates aligned with utility-specific relay test procedures (e.g., NERC PRC-005, ENTSO-E RAPID).
Software & Data Management
While the Sverker 750/760 operates as a standalone instrument, it supports optional PC connectivity via RS-232 or USB-to-serial interface for automated test scripting and report generation using Megger’s RelayTest software (v5.2+). This software enables creation of repeatable test sequences—including ramp-up, step-change, and timing sweep profiles—with embedded compliance checks against user-defined tolerances. Generated reports include timestamped raw data, relay response waveforms (via optional analog capture), operator ID, calibration status, and digital signatures—fully compliant with FDA 21 CFR Part 11 audit trail requirements when deployed in regulated environments.
Applications
- Commissioning and periodic maintenance of feeder protection relays in distribution networks (LV/MV).
- Functional testing of residual current circuit breakers (RCCBs), earth-leakage relays, and ground-fault interrupters (GFIs).
- Verification of auto-reclose logic timing (dead time, re-close delay, lockout conditions) per IEC 62271-100.
- Directional overcurrent relay sensitivity mapping using variable phase-angle injection.
- Calibration verification of auxiliary VTs and CTs by secondary injection with simultaneous ratio and polarity assessment.
- Troubleshooting misoperations in legacy electro-mechanical relays through incremental current/voltage ramping and hold-on-trip analysis.
FAQ
Can the Sverker 750/760 perform three-phase relay testing?
No. It is strictly a single-phase test set. For three-phase applications, Megger recommends the Sverker 900 series or Omicron CMC 356.
Is external current shunt required for high-current measurements?
No. The unit incorporates internal current sensing with direct 200 A capability; external shunts are only needed for specialized high-precision metrology labs.
Does the timer support event-triggered start/stop?
Yes — the timer initiates automatically upon output enable and halts on relay contact closure or programmable threshold crossing.
What safety certifications does the instrument carry?
It is CE-marked per EN 61010-1:2019 (CAT III 300 V), carries UL recognition (E119305), and complies with RoHS 3 and REACH Annex XVII.
How often must the unit be calibrated?
Megger recommends annual calibration against accredited standards; certificate includes as-found/as-left data and uncertainty budgets per ISO/IEC 17025.
