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HF-RT-203 Single phase relay test set
This portable single phase relay test set outputs adjustable AC/DC voltage and current to simulate power grid faults. It accurately tests pickup current, trip time of overcurrent, undervoltage and auxiliary relays for distribution system regular calibration.
One-year warranty on exported units
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Download datasheet (PDF · 245 KB)
Overview of Single Phase Relay Test Set
The Single Phase Relay Test Set is a compact, high-precision professional testing device designed for single-phase protective relay calibration and power system secondary circuit commissioning. It integrates stable AC/DC voltage and current output functions, supporting comprehensive testing for various common relays including measuring relays, timing relays, auxiliary relays, reclosing relays and differential relays. Adopting a high-precision 4.5-digit display and accurate millisecond timing system, it can stably measure relay pick-up value, reset value, holding value, operating time and core characteristic parameters. Lightweight and easy to operate, this test set adapts perfectly to on-site rapid maintenance, routine inspection and laboratory performance verification of power distribution systems, fully meeting standard technical requirements for relay protection testing.
Product Features
- Measuring Relays: Capable of testing the pick-up value, reset value and reset coefficient of current relays and voltage relays.
- Timing Relays: Available to measure pick-up value, reset value and operating time.
- Auxiliary Relays: Test pick-up value, reset value, holding value and operating time for all types of auxiliary relays with operating coils and holding coils.
- Reclosing Relays: Support capacitor charging test, charging duration, reclosing time and testing of internal intermediate components.
- Differential Relays: Perform DC excitation test, braking characteristic test and volt-ampere characteristic test.
- All other uncommon types of protective relays.
Technical Parameters
| Category | Item | Specifications |
|---|---|---|
| Operating Conditions | Input Power Supply | AC 220V ±10%, 50Hz |
| Ambient Temperature | -10℃ ~ 40℃ | |
| Ambient Humidity | ≤85% | |
| Atmospheric Pressure | 86 ~ 106 kPa | |
| Output Power Sources | AC Voltage Output | 0 ~ 220V, 3A |
| AC Current Output | 0 ~ 100A / 7.5V 0 ~ 20A / 25V 0 ~ 5A / 5V |
|
| DC Voltage Output | 0 ~ 220V, 3A | |
| DC Current Output | 0 ~ 20A / 25V | |
| Fixed DC Output Voltage | DC24V, DC48V, DC110V, DC220V | |
| Performance Specifications | Current & Voltage Meter | 4½ digit digital display |
| Digital Millisecond Chronometer | Measuring range: 0 ~ 99.9999 s |
Packing List – Single Phase Relay Test Set
|
No.
|
Item Description
|
Qty
|
Unit
|
Remarks
|
|---|---|---|---|---|
|
1
|
Single Phase Relay Test Set Main Unit
|
1
|
Set
|
Core equipment
|
|
2
|
AC220V Power Cord
|
1
|
Pcs
|
Mains power connection
|
|
3
|
Voltage & Current Test Lead Set
|
1
|
Set
|
For relay testing connection
|
|
4
|
Switch Signal Test Cables
|
1
|
Set
|
Trip & signal detection
|
|
5
|
English Operation Manual
|
1
|
Copy
|
Official operation guide
|
|
6
|
Factory Calibration Certificate
|
1
|
Copy
|
Test accuracy certification
|
|
7
|
Quality Inspection Report
|
1
|
Copy
|
Pre-delivery inspection
|
|
8
|
Spare Fuses
|
1
|
Pack
|
Consumable spare parts
|
|
9
|
Export Wooden Case / Carton
|
1
|
Pcs
|
Shockproof packaging
|
FAQ: Single Phase Relay Test Set
Q1: What is a Single Phase Relay Test Set?
A1: It is portable secondary injection test equipment designed to calibrate single-phase protection relays. It outputs adjustable AC/DC voltage & current to simulate grid faults, verifying pickup value, trip time, reset characteristic of overcurrent, undervoltage, auxiliary relays widely used in distribution power systems.
Q2: What types of relays can this device test?
A2: Overcurrent relays (ANSI 51), undervoltage/overvoltage relays, thermal overload relays, auxiliary control relays, earth fault relays, electromagnetic relays, and small motor protection relays for 0.4kV~10kV distribution networks.
Q3: Where is the single-phase relay tester mainly applied?
A3: Power distribution stations, industrial plant power rooms, railway power supply systems, electrical maintenance companies, electrical engineering contractors, and small hydropower stations for daily relay inspection & periodic calibration.
Q4: What is the core advantage compared with 3-phase relay test sets?
A4: Lighter weight, compact size, lower cost, easy to carry for on-site field tests. Perfect for routine single-element relay checking; multiple units can be cascaded temporarily for simple 3-phase relay testing if needed.
Q5: What is the standard output range of current and voltage?
- AC Current: 0~50A continuous adjustable; DC Current: 0~10A
- AC Voltage: 0~250V; DC Voltage: 0~120V
- Frequency: 50Hz/60Hz switchable
- Measurement accuracy: ±0.5% FS
Q6: Does it support timing test for relay operating time?
A6: Yes. Built-in high-precision timer (range 0~999.99s, resolution 1ms), automatically records relay pickup & trip reset time during testing.
Q7: Can it output harmonic signals?
A7: Standard version supports 2nd~5th harmonic superimposition, meeting thermal relay & overload protection testing requirements.
Q8: What working environment can the tester adapt to?
A8: Operating temperature: -10℃ ~ +40℃; relative humidity ≤80% (non-condensing); suitable for indoor lab and outdoor field maintenance.
Q9: How to perform an overcurrent relay pickup test step by step?
- Connect tester current output terminals to relay current input loop correctly
- Set initial low current value, slowly ramp up current
- Stop output once relay trips, record the pickup current value
- Test 3 times repeatedly to confirm data consistency.
Q10: Why does the tester show overload alarm during current output?
A10: 3 common reasons:
- Current loop open circuit or loose wiring terminals
- Output current exceeds the tester maximum continuous load capacity
- Short-circuit occurs on voltage output loop. Cut off power immediately, check all wiring before restarting.
Q11: The tester cannot capture relay trip action signal, how to fix?
- Check trip contact wiring (NO/NC contact selection error is the most common cause)
- Verify switch channel polarity setting on the tester
- Confirm the relay has enough auxiliary power supply to actuate contacts.
Q12: Can the device store test reports and export data?
A12: Yes. Built-in memory saves test records; equipped with USB interface to export data to PC for report archiving and printing.
Q13: No display after powering on the tester?
A13: Check input AC220V power supply; inspect internal power fuse blown; contact our after-sales team for hardware repair if fuse replacement still fails.
Q14: Output value deviates greatly from the set value?
- Re-calibrate the instrument regularly
- Avoid long-time full-load continuous output
- Keep the tester away from strong electromagnetic interference environment.
Q15: PC software fails to communicate with the tester?
A15: Confirm USB/serial cable intact; match baud rate & communication protocol; reinstall supporting test software on the computer.
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