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High Precision Microcomputer Relay Protection Tester And Relay Protection Calibrator

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High Precision Microcomputer Relay Protection Tester and Relay Protection Calibrator

The three-phase relay protection tester adopts a high-speed and high-performance digital control processor, and applies a dual precision algorithm to generate high-precision waveforms for each phase.
The overall structure of the equipment adopts an integrated structure, with each part tightly combined, short data transmission distance, and compact structure. Not only does it overcome the problem of fewer output waveform points caused by long data communication lines and narrow frequency bands in laptop controlled measurement and control instruments, but it also has good transient characteristics, phase frequency characteristics, and amplitude frequency characteristics, making it easy to achieve precise phase shifting and harmonic superposition

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Model:
GDJB-PC
Brand:
GOLD

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

True standalone field unit: 90%+ of tests without a PC All‑in‑one: replaces current source, voltage source, timer, sync tester, harmonic source
	High accuracy & low distortion: linear amplifier for reliable protection testing Complete safety: hardware + software protection, auto time‑limit for high current Easy to use: fixed test templates, 3‑step operation (set → start → get result)

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.

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