Xianheng International (Hangzhou) Electrical Manufacturing Co., Ltd.
Secondary Injection Test Kit

Secondary Injection Test Kits

A secondary injection test kit is a relay testing instrument that supplies controlled current and voltage signals directly to a protection relay’s secondary inputs to verify pickup values, operating times and protection functions. Depending on the test system, frequency, phase angle and binary inputs or outputs can also be used for more advanced relay testing.

Secondary Injection Test Kits for Protective Relay Testing

Elecgene secondary injection test sets are designed for commissioning, maintenance and functional testing of electromechanical, static and numerical protection relays.


Available configurations include a high-current single-phase relay tester, a battery-powered handheld three-phase test system, a three-current/four-voltage relay test system and a six-current/six-voltage system. Different configurations allow users to select the appropriate current and voltage output capacity for their relay testing requirements.

SRPT 750 Single Phase Relay Test System

SRPT 750 Single Phase Relay Test System

Compact design and light weight makes SRPT-750 extremely portable, mostly used for almost all types of single phase relays test.


  • Easy to operate

  • Designed for rugged field use

  • Such as power, voltage and current

  • 0 to 100 Amp output current (overload 150A)

  • Suitable for testing many different types of relays such as power, voltage and current


PRE 431S PRO Hand-held Relay Test System

PRE 431S PRO Hand-held Relay Test System

The PRE 431S pro Hand-held Relay Test System is the engineer’s ultimate toolbox that addresses the increasing need for three-phase testing capability in electrical distribution substations, renewable power generation stations and industrial applications.


  • Stand-alone functionality

  • Light weight and portable, just 3.2kg

  • 10.1" industrial Hi-bright touch screen

  • Individually 3 current & 4 voltage sources

  • Built-in lithium battery, convenient for outdoor use


PRE 431 3 Current and 4 Voltage Relay Test System

PRE 431 3 Current and 4 Voltage Relay Test System

PRE-431 3 Current and 4 Voltage Relay Test System has high-performance current and voltage output and can meet the test needs of distribution substations, renewable energy systems and industrial applications. It helps engineers conduct relay tests reliably and save time.


  • Easy to use

  • Integrated design

  • Lightweight and portable

  • Manual and PC remote control


PRE 661 6 Current and 6 Voltage Relay Test System

PRE 661 6 Current and 6 Voltage Relay Test System

The internal modular design of the instrument can independently complete the testing and debugging of devices and components in the professional fields of relay protection, excitation, metering, wave recording, etc.


  • Easy to use

  • Integrated design

  • Light weight and portable

  • Manual and PC remote control

  • Excellent software provides great visuals and simple setup


Why Choose Elecgene Secondary Injection Test Kit?

Flexible Current and Voltage Output

Elecgene relay test systems provide controlled current and voltage outputs for different protection relay testing requirements. The PRE 431 provides three current and four voltage channels, while the PRE 661 expands this to six current and six voltage channels for more demanding multi-phase testing.

Support for Different Protection Relay Types

The relay test systems are designed for testing different types of protection relays, including electromechanical, static and numerical relays. This allows the same test platform to be used across a range of protection applications.

Single-Phase and Multi-Phase Options

Elecgene offers different relay test configurations, from the single-phase SRPT 750 to multi-phase systems such as the PRE 431, PRE 431S PRO and PRE 661. Customers can select the test configuration according to the relay type and protection scheme being tested.

Portable Options for Field Testing

For on-site testing, the PRE 431S PRO provides three current and four voltage sources in a 3.2 kg battery-powered design. The SRPT 750 also uses a compact design for field relay testing.

Manual and PC-Based Testing Options

Depending on the model, Elecgene relay test systems support on-site manual operation and PC-based control, giving engineers different options for setting test parameters, controlling outputs and recording test results. 

Frequently Asked Questions About Secondary Injection Testing

What is a secondary injection test kit?

A secondary injection test kit supplies controlled current and voltage signals directly to a protection relay’s secondary inputs. Depending on the test system, frequency and phase angle can also be controlled, while binary inputs and outputs can be used to monitor relay status and trip signals. It is used to verify relay operating characteristics, timing, logic and outputs.

What is the difference between primary and secondary injection testing?

Secondary injection applies controlled signals directly to the relay or secondary circuit. Primary injection applies high current to the primary circuit and can verify a wider protection path, including CTs, conductors, wiring and relay operation.

What types of protection relays can be tested with a secondary injection test system?

Depending on the test system and relay configuration, secondary injection equipment can be used to test electromechanical, static and numerical protection relays. Typical applications include overcurrent, voltage, differential, distance and other protection functions that require controlled current and voltage simulation.

What can a relay test system measure during secondary injection testing?

Depending on the model, a relay test system can measure parameters such as current, voltage, phase angle and operating time, while binary inputs and outputs can be used to monitor relay contacts and trip signals. These measurements help engineers evaluate relay operating characteristics under defined test conditions.

How do I choose a secondary injection relay tester?

Start with the protection scheme and relay type being tested. Then consider the required number of current and voltage channels, output range, phase control, measurement functions, binary inputs and outputs, automation requirements and field portability. A single-phase tester may be suitable for basic relay testing, while more complex protection schemes may require a multi-phase system with more current and voltage channels.

Secondary Injection Test Kit Knowledge Center

A secondary injection test kit is a relay testing instrument that injects controlled current and voltage signals directly into protection relay input terminals to verify relay settings, logic, timing ...
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