Table of Contents

Product Features

It fulfills all on-site testing requirements, equipped with standard 4-phase voltage and 3-phase current outputs. It can test traditional relays, protection devices as well as modern microprocessor-based protection equipment, enabling simpler and more comprehensive tests especially for transformer differential protection and automatic bus transfer devices.
All technical parameters fully comply with DL/T624-1997 Technical Conditions for Microcomputer-Based Relay Protection Test Devices issued by the Ministry of Electric Power.
Adopting the classic Windows XP operating system, it features a user-friendly human-machine interface for easy and efficient operation. Equipped with a high-performance embedded industrial controller and a 10.4-inch 800×600 LED true-color display screen, it displays abundant intuitive information including real-time operating status and various help prompts.

Technical Specifications

AC Current Source (3×30A)

Item	Parameters
Single-phase current output (RMS)	0~30A per phase, accuracy: 0.2% ±5mA
3-phase parallel output (RMS)	0~90A, three phases output in parallel with identical phase
Long-term permissible continuous working current per phase (RMS)	10A
Maximum output power per phase	300VA
Max total output power for three parallel currents	800VA
Max allowable working duration for combined 3-phase parallel current	10s
Frequency range	0~1000Hz, accuracy: 0.01Hz
Harmonic orders	2~20 orders
Phase angle	0~360°, accuracy: 0.1°

DC Current Source

Item	Parameters
DC current output	0~±10A per phase, accuracy: 0.2% ±5mA

AC Voltage Source

Item	Parameters
Single-phase voltage output (RMS)	0~125V per phase, accuracy: 0.2% ±5mV
Line voltage output (RMS)	0~250V
Output power (Phase voltage / Line voltage)	75VA / 100VA
Frequency range	0~1000Hz, accuracy: 0.001Hz
Harmonic orders	2~20 orders
Phase angle	0~360°, accuracy: 0.1°

DC Voltage Source

Item	Parameters
Peak value of single-phase voltage output	0~±150V, accuracy: 0.2% ±5mV
Peak value of line voltage output	0~±300V
Output power (Phase voltage / Line voltage)	90VA / 180VA

Switch Quantity Terminals

Item	Parameters
Digital input terminals	8 pairs
Idle contact	1~20mA, built-in 24V power supply inside the device
Potential reversal	Passive contact: low-resistance short-circuit signal Active contact: 0~250V DC
Digital output terminals	4 pairs, vacant contacts; Breaking capacity: 110V/2A, 220V/1A

Other Parameters

Item	Parameters
Time range	1ms~9999s, measurement accuracy: 1ms
Dimension & Weight (Portable model)	Overall size: 338 × 168 × 305 mm, approx. 12 kg
Power Supply	AC 220V ±10%, 50Hz, 10A

Continuous Working Time of AC Current

Operating Current	Allowable Working Duration
Operating current ≤ 10A	More than 60 minutes
10A ＜ Operating current ≤ 20A	More than 70 seconds
20A ＜ Operating current ≤ 30A	More than 15 seconds
Operating current = 30A	More than 5 seconds

Operation Procedure for 3 Phase Relay Test Set

Step 1: Pre-Operation Preparation

Inspect the tester, test leads, power cord and all accessories for intactness before use.
Place the unit on a flat, stable platform; connect the AC220V power supply firmly.
Confirm the tested relay/protection device is fully powered off and grounded safely to avoid electric hazards.

Step 2: Wiring Connection

Connect 3-phase current output terminals and 4-phase voltage output terminals of the tester to the corresponding secondary terminals of the protective relay via insulated test wires.
Link switch quantity input/output cables between the tester and relay trip/auxiliary contact ports.
Plug the USB communication cable if you need to control the tester via an external laptop.

Step 3: Boot Up & Software Initialization

Turn on the power switch to start the device; the built-in Windows XP system loads automatically.
Launch the dedicated relay test software on the touch screen. Complete system self-check and automatic precision calibration.
Select corresponding test items: overcurrent protection, transformer differential protection, auto-switch device test etc. according to on-site testing requirements.

Step 4: Parameter Setting & Fault Simulation

Set output current, voltage, frequency, phase angle, harmonic parameters and action threshold values on the software interface.
Configure fault types: short circuit, earth fault, voltage loss, abnormal frequency and other grid fault conditions.
Adjust test duration and recording modes as needed.

Step 5: Start Testing & Record Data

Preview the output waveform to verify all settings are correct, then run the test program formally.
Observe relay tripping action, record operating time, action value and other key test data synchronously.
Repeat tests multiple times to check protection action consistency and accuracy.

Step 6: Save Test Results

After testing finishes, store test reports, waveform curves and parameter records in the system.
Export data to USB flash drive for filing, printing or further analysis.

Step 7: Shutdown & Post-Use Arrangement

Reset all output values to zero, close the test software properly.
Shut down the operating system normally, then cut off the main power supply.
Disconnect all test wires one by one, tidy up cables, pack all accessories into the shipping case.

FAQ for 3 Phase Relay Test Set

Q1: What is this 3 Phase Relay Test Set used for?

A1: It is professional equipment for Protective Relay Testing. Equipped with 3-channel current & 4-channel voltage outputs, it simulates power grid faults to calibrate conventional relays, microcomputer protection devices, transformer differential protection and automatic bus transfer devices for power substations.

Q2: Which technical standards does this tester comply with?

A2: Its all technical indicators fully meet DL/T624-1997 standard issued by China Ministry of Electric Power, and it is also applicable to global IEC & ANSI power industry testing specifications.

Q3: What is the maximum single-phase output current? Can three phases be connected in parallel?

A3: Single-phase AC current output: 0~30A. Three phases can be paralleled to achieve a total maximum output current of 90A for high-current testing demands.

Q4: How long can the large current output work continuously?

A4: Working time varies by current: ≤10A: over 60 mins; 10~20A: over 70s; 20~30A: over 15s; Rated 30A: over 5s, to protect the internal power amplifier module.

Q5: Does it support harmonic generation and phase adjustment?

A5: Yes. It supports 2~20 orders of harmonics, phase angle adjustable 0~360° (accuracy 0.1°), frequency range 0~1000Hz for flexible fault simulation.

Q6: What operating system does the tester adopt? Can I operate it via laptop?

A6: It runs built-in Windows XP system with 10.4-inch LED true color screen. You can connect an external laptop via USB cable; both sides share the same control software.

Q7: Does manual calibration need to be done regularly to keep testing accuracy?

A7: No need for frequent manual adjustment. The device supports automatic software calibration to maintain long-term testing precision steadily.

Q8: What interfaces are available for communication connection?

A8: Standard USB interface is equipped, plug-and-play, no extra adapters required for PC connection and data transmission.

Q9: Can it test transformer differential protection and automatic bus transfer devices?

A9: Definitely. The 3-phase current + 4-phase voltage layout is specially optimized for these two types of protection tests, with simpler operation and more reliable test results.

Q10: Does the device have switching value input and output ports?

A10: It has 8 pairs of digital input terminals and 4 pairs of digital output terminals, which can perfectly collect relay trip signals and output control signals during testing.

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HF-RT-202 3 Phase Relay Test set