Product Description

Buy quality Three Phase Relay Protection Tester equipment from Weishine, a professional manufacturer in China, is engineered to inspect protective relays, microprocessor protection units, secondary circuits, automation equipment and complete power grid protection systems. Relays must respond accurately under line faults, abnormal voltage, overcurrent, reclosing actions, differential protection triggers and control circuit movements, so regular testing is essential for safe, coordinated power system operation.

What Is Three Phase Relay Protection Tester?

A Three Phase Relay Protection Tester is a professional testing device designed to verify the performance and operating characteristics of protective relays, microprocessor-based protection units, secondary circuits, automation equipment, and power system protection schemes.

The tester generates controllable secondary current, voltage, frequency, phase angle, harmonic, DC, and switching signals to simulate normal and abnormal power system conditions. By applying these simulated signals to the tested protection devices, engineers can verify relay settings, pickup values, operating time, trip logic, and contact response.

Three Phase Relay Protection Tester

Multi-Channel Current and Voltage Output

The Three Phase Relay Protection Tester is equipped with 4 voltage channels and 3 current channels for comprehensive relay protection testing. The voltage channels support phase voltage, line voltage, zero-sequence voltage, voltage unbalance, loss-of-voltage, frequency shift, and synchronism tests.

The three current channels can operate independently for individual phase current testing or connect in parallel to provide up to 120A short-time current output. It supports testing of overcurrent relays, earth fault relays, inverse-time protection, differential protection, distance protection, reclosing logic, undervoltage protection, and frequency relays.

Industrial Computer Control and Field Operation

Built on an industrial computer platform, the tester integrates a built-in display and local operation panel for standalone field testing without an external computer. Test parameters and results can be viewed directly on the screen, making it suitable for onsite commissioning and maintenance.

The equipment can also connect to a PC with compatible software to support advanced testing functions, data management, and automatic test report generation.

Flexible Current, Voltage and DC Output

The tester provides a wide range of output capabilities, including:

AC current output: 0~40A per channel, up to 120A short-time output with three channels in parallel

AC voltage output: 0~120V phase voltage and 0~240V line voltage

DC output: DC current, DC voltage, and adjustable DC auxiliary power supply

These functions support DC relay testing and allow protection devices and secondary circuits to be energized during field commissioning.

Frequency, Harmonic and Timing Measurement

The tester integrates variable frequency and harmonic signal output to simulate different power system operating conditions, including frequency variation and multi-order harmonic environments. This enables technicians to evaluate relay performance under different secondary signal conditions rather than only under standard power frequency.

The built-in switch input and output modules support trip contact detection, relay contact monitoring, circuit breaker simulation, startup signal verification, and action timing measurement. The timing range reaches 0.1ms to 9999s, allowing accurate measurement of relay operation time, trip delay, reclosing intervals, and protection logic response.

Application Range and Safety Protection

The Three Phase Relay Protection Tester is suitable for testing electromagnetic relays, static relays, digital protection devices, microprocessor relays, reclosing devices, and transformer, line, motor, and generator protection systems.

It is widely used in substations, power plants, factory distribution rooms, railway power supply networks, and professional relay laboratories.

Multiple protection functions are integrated, including output overload protection, fault self-diagnosis, output interlock, and soft-start power design. These functions help protect both the tester and connected equipment during field operation. The equipment should be operated by trained technicians familiar with secondary circuit safety, standard wiring procedures, and relay testing workflows.

The equipment complies with GB/T 7261-2008 and DL/T 624-2010. Operators need to abide by local relay testing codes, power station commissioning rules and on-site safety standards during use.

System Specifications		AC Current Output		DC Current Output
Item	Specification	Item	Specification	Item	Specification
Product model	VS-JB900	Output accuracy	Class 0.2	Output accuracy	Class 0.5
Product type	Three-phase relay protection tester	Phase current output, RMS	0 to 40 A	Phase current output	0 to ±10 A per phase
Control platform	Industrial computer type	Three-phase parallel current output, RMS	0 to 120 A	Three-phase parallel output	0 to ±30 A
Output configuration	4-phase voltage, 3-phase current	Long-time allowable phase current, RMS	10 A	Maximum output load voltage	20 V
Applicable tests	Relay protection, secondary circuit, automation device testing	Maximum phase current output power	420 VA
Operation mode	Standalone operation; computer connection supported according to configuration	Maximum output power at three-phase parallel current	900 VA
Reference standards	GB/T 7261-2008, DL/T 624-2010	Allowable working time at maximum three-phase parallel current	10 s
		Fundamental frequency range	20 to 1000 Hz
		Harmonic order	1st to 20th

AC Voltage Output		DC Voltage Output		Switching Quantity And Timing
Item	Specification	Item	Specification	Item	Specification
Output accuracy	Class 0.2	Output accuracy	Class 0.5	Switching input	10 channels
Phase voltage output, RMS	0 to 120 V	Phase voltage output amplitude	0 to ±160 V	Dry contact input	1 to 20 mA, 24 V
Line voltage output, RMS	0 to 240 V	Line voltage output amplitude	0 to ±320 V	Potential contact input, logic 0	0 to +6 V
Phase voltage / line voltage output power	80 VA / 100 VA	Phase voltage / line voltage output power	70 VA / 140 VA	Potential contact input, logic 1	+11 V to +250 V
Fundamental frequency range	20 to 1000 Hz			Switching output	8 pairs
Harmonic order	1st to 20th			DC contact capacity	220 V / 0.2 A
				AC contact capacity	220 V / 0.5 A
				Time measurement range	0.1 ms to 9999 s
				Time measurement accuracy	0.1 ms

Environmental Conditions		Physical Characteristics
Item	Specification	Item	Specification
Operating temperature	-10°C to +50°C	Main unit dimensions	400 × 300 × 180 mm
Storage temperature	-25°C to +70°C	Main unit weight	Approximately 18 kg
Relative humidity	5% to 95%, non-condensing

Product Operation Guide

The Three-Phase Relay Protection Tester generates controllable secondary current, voltage, frequency, phase angle, harmonic, DC and switching signals to simulate normal and faulty grid conditions, then feeds signals to the tested protection device. It monitors contact actions, trip outputs, return signals and logic feedback, automatically recording action time and operating setting values.

Before testing, confirm relay model, rated secondary current, rated secondary voltage, DC power demand, trip contact type and preset protection parameters. Check protection device wiring diagrams, isolate test circuits per safety rules, then wire current outputs, voltage outputs, switch I/O ports and DC auxiliary power terminals properly.

Overcurrent relay test steps: Set output current, phase angle, frequency and test duration. Boost current gradually per standard test procedures, record pickup value, dropout value and operating time. For three-phase high-current testing, parallel three current channels to reach maximum short-time 120A output.

Voltage relay test steps: Connect voltage channels and configure phase or line voltage as required. The unit simulates undervoltage, overvoltage, zero-sequence voltage, voltage imbalance and phase offset; frequency shifting function serves under-frequency load shedding and frequency relay calibration.

Distance, directional, differential and reclosing protection testing: Adjust voltage, current, phase angle and switch contacts following protection logic schemes. The equipment tracks relay contact movement and measures trip time; switch output ports simulate breaker auxiliary contacts or external logic signals when needed.

DC relay and auxiliary circuit testing: Use DC voltage/current output within rated ranges. When on-site DC power is unavailable or isolated test power is required, activate the built-in adjustable DC auxiliary power supply.

After finishing all tests, compare measured action values and timing data with preset protection settings. Archive test records following internal maintenance and commissioning management regulations.

Core Features

1．Standard 4-phase voltage and 3-phase independent current output channels

2．Single-channel AC current output up to 40A

3．Three parallel current channels support short-time maximum 120A output

4．AC phase voltage output range: 0~120V

5．AC line voltage output range: 0~240V

6．Built-in DC current output for all relay protection testing scenarios

7．Built-in DC voltage output for secondary circuit state simulation

8．Independent adjustable DC auxiliary power supply output

9．Relay action timing range: 0.1ms ~ 9999s

10．Switch input channels for real-time relay contact status monitoring

11．Switch output channels to simulate circuit breakers and external contact signals

12．Harmonic signal output for testing protection devices’ harmonic response characteristics

13．Variable frequency signal output for frequency relay inspection

14．Onboard display screen to clearly show all test parameters and results

15．Industrial computer control enables fully offline independent operation

16．Reserved USB port for data reading and supporting software linkage

17．Automatic output interlock under abnormal working status to prevent equipment damage

18．Integrated fault self-check and multi-layer hardware protection functions

19．Compatible with calibration of microprocessor protection, static relays and electromagnetic relays

20．All-in-one tool for field commissioning, daily maintenance and laboratory testing

Application Scenarios

1. Power Grid Operation & Maintenance Teams

Carry out commissioning for new substations, periodic protection calibration, secondary circuit inspection, trip circuit testing and full protection scheme maintenance.

2. Transformer Manufacturers

Conduct factory inspection of protection cabinets, differential relay verification, temperature protection interface checking and factory acceptance tests for protection panels.

3. Power Plants

Complete calibration of generator protection, main transformer protection, motor protection, auxiliary power system and switchgear protection during unit commissioning and outage maintenance.

4. Railway Industry

Railway traction substations and distribution networks are equipped with relay protection devices. The equipment handles routine relay maintenance, feeder protection verification and circuit breaker trip logic review.

5. Large Industrial Enterprises

Steel, mining, petrochemical and manufacturing plants use it for medium-voltage relay regular maintenance, motor protection testing and factory substation protection circuit inspection.

6. Universities & Vocational Training Institutions

Apply the machine for teaching relay protection theories, secondary injection test operations, fault condition simulation and protection coordination practical training.

7. Third-Party Testing Laboratories

Complete relay calibration, protection equipment performance verification, incoming acceptance inspection and external commissioning service provision.

8. Cable Maintenance Crews

After cable replacement or repair, verify feeder protection, earth fault protection, reclosing logic and matched secondary control circuits.

Available Test Items

1．Overall performance inspection of microprocessor-based protection devices

2．Calibration and verification of electromagnetic relays

3．Performance testing of static relays

4．Pickup value and time-limit testing for overcurrent relays

5．Full inspection of earth fault relays

6．Calibration of undervoltage and overvoltage protection relays

7．Performance testing of frequency relays

8．Functional simulation test for directional protection

9．Complete calibration of differential protection

10．Working condition simulation for distance protection

11．Functional inspection of auto-reclosing devices

12．Circuit breaker trip circuit verification

13．Full on-site secondary circuit commissioning

14．Factory acceptance testing for protection panels

15．Precise measurement of relay action time

Practical Application Case

Industry Field: Medium-voltage substation upgrading and commissioning

Project Challenge: A construction team took charge of a substation renovation project. Its internal protection panels contained overcurrent, earth fault, undervoltage, reclosing and breaker trip logic functions. The project required one single machine that could output three-phase current, four-phase voltage, and support contact simulation & high-precision timing. This is where Three-Phase Relay Protection Tester delivers all-in-one testing capability.

Complete Test Flow: Technicians connected the device to relay current input terminals, voltage input terminals, trip contacts and external logic circuits. They first tested AC current pickup and dropout values, then recorded protection action time under simulated fault current. Voltage channels simulated undervoltage and voltage recovery states; switch output simulated breaker auxiliary contact state changes, while switch input captured trip and return signals synchronously.

Project Outcome: All relay setting values matched the commissioning design scheme. Trip time and action data were filed into operation & maintenance documents. All wiring and setting deviations were corrected before protection panels were officially put into operation.

Application Advantages: Standardized secondary simulation signals are generated by one single machine, with traceable timing data for filing. No separate current sources, voltage sources, timers or contact simulators are needed, drastically cutting on-site tool quantities.Reduce overall procurement cost for engineering companies.

FAQ

1、What is the Three-Phase Relay Protection Tester used for?

It is used for secondary injection testing of protective relays, microprocessor protection devices, trip circuits, reclosing devices, and protection panels.

2、How many voltage and current outputs does the VS-JB900 provide?

It provides standard 4-phase voltage and 3-phase current output.

3、What is the maximum AC current output?

Each phase can output 0 to 40 A RMS. When three current channels are connected in parallel, the output can reach 0 to 120 A RMS for short-duration testing.

4、What is the AC voltage output range?

The phase voltage output range is 0 to 120 V RMS, and the line voltage output range is 0 to 240 V RMS.

5、Can the tester measure relay action time?

Yes. The time measurement range is 0.1 ms to 9999 s, with 0.1 ms accuracy.

6、Does the Three-Phase Relay Protection Tester support DC output?

Yes. It supports DC current output, DC voltage output, and an independent DC auxiliary power output for relay and secondary circuit testing.

7、What types of relays can be tested?

The tester can be used for overcurrent, earth fault, voltage, frequency, differential, distance, directional, reclosing, and other protection devices.

8、Which standards are applicable?

Reference standards for this type of relay protection tester include GB/T 7261-2008 and DL/T 624-2010. Users should also follow local relay protection testing procedures.

Corporate Strengths – Weshine Electric

As a professional manufacturer, we support OEM & bulk wholesale.Weshine Electric develops and supplies power testing instruments for power grid operators, substations, electrical contractors, testing labs, railway power departments and all kinds of industrial users. For relay protection testing scenarios, we focus on stable secondary signal output, convenient field operation and standardized test workflows, paired with reliable post-sales technical support.

We offer customers equipment selection guidance, practical operation training for various relay tests, secondary circuit test scheme planning, and customized testing solutions for special inspection demands. Every unit undergoes full factory quality inspection, with operation tutorials and global after-sales service available. With years of power engineering supporting experience, we deliver complete relay testing solutions to help clients raise relay commissioning and inspection efficiency, and ensure stable operation of the whole power protection system.Fast global shipment, flexible payment terms for bulk buyers.