High Precision Microcomputer Relay Protection Tester and Relay Protection Calibrator
Product Description
What problem was solved?
Replace multiple discrete instruments and complete all protection verifications for AC/DC relays, overcurrent/undervoltage/power direction/differential/synchronization/low frequency in one stop, bidding farewell to multi device switching, complex wiring, and inconsistent data
High precision linear amplifier+32-bit dual precision operation, pure waveform without high-frequency interference, solves the problems of waveform distortion, large harmonics, and protection misoperation/rejection in traditional testers
Built in industrial computer+Windows+trackball keyboard, no need for external computer on site, solving the pain points of outdoor/distribution room without computer, difficult wiring, and cumbersome operation
Equipped with quadruple protection against overheating, overcurrent, overvoltage, and short circuit, and high current software time limit, it prevents burning of the machine and relays, and solves the problem of unsafe long-term high current output
Fully automatic measurement of action/return value+time+coefficient, automatic recording and generation of results, solving the problems of slow manual reading, large errors, and non-standard reporting
What are the main differences between GDJB-PC and ordinary three-phase relay protectors?
Item | GDJB‑PC | Ordinary Tester |
|---|---|---|
Output Stage | High‑performance linear amplifier | Switching supply / basic amp |
Operation | Standalone trackball + external mouse/keyboard | PC‑only or simple keypad |
AC Current | 0–40A/phase; 0–120A (3‑phase parallel) | Typically ≤30A/phase; ≤90A parallel |
Harmonics | Fundamental + DC + 2–20th harmonics | Usually fundamental only, ≤5th harmonic |
Fault Simulation | Instantaneous, permanent, evolving faults | Basic faults only, no evolving faults |
I/O | 10×DI, 8×DO | Typically 8×DI, 4×DO |
Aux DC Supply | 110V/220V 1.5A adjustable | None or fixed, unprotected |
What experiments can GDJB-PC perform directly without additional programming?
AC/DC relay action/return/time test
Simultaneous, low-frequency/high-frequency, low-voltage lockout, df/dt lockout
Power direction, impedance, grounding distance, zero sequence protection
Differential and differential harmonic braking
Whole set test I/II, fault replay, comprehensive protection of 6-35kV lines
High frequency low frequency test | Harmonic superposition test | Power direction and impedance testing |
Parameter table
Item | Specification |
|---|---|
AC Current | 0–40A/phase (0.2 class); 0–120A (3P); 10A continuous |
AC Voltage | 0–120V/phase (0.2 class); 0–240V line‑line |
DC Current | 0–±10A/phase; 0–±30A (3P) (0.5 class) |
DC Voltage | 0–±160V/phase; 0–±320V line‑line (0.5 class) |
Frequency | Fundamental 0–1000Hz; harmonics 0–20th |
Digital I/O | 10×DI (dry / 0–250V); 8×DO |
Time Measurement | 0.1ms – 9999s; accuracy <0.1ms |
Aux DC | 110V/220V 1.5A, fuse protected |
Operation | Industrial LCD, trackball, keyboard; supports external mouse/keyboard |
Advantages
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FAQ
1.Can I use it without a computer on site?
Yes. Full standalone mode with rotary mouse and panel keyboard supports complete testing and data storage. Connect a USB drive or PC only for report export.
2.Is high‑current output safe?
Yes. Output >10A activates automatic software time‑limit (higher current = shorter time). Amplifier protection limits output and alarms on overcurrent/overheat/short circuit.