SPI225 Smart primary injection test system
Smart Touch View Interface (STVI)
A key feature of the SPI system is the simplified touch screen input. The STVI touch screen input eliminates the confusing menu system of other primary injection and circuit breaker test systems.
Manual control
The SPI system permits the operator to run any of the standard tests required for primary injection, as well as low voltage circuit breakers, without the need for a laptop computer.
DC offset elimination
DC offset is a common problem when testing instantaneous trips on low voltage circuit breakers. A standard high current test system will commonly cause DC offset in the initial 2 to 4 cycles of an output waveform. This DC offset will cause circuit breakers to trip at incorrect current amplitudes therefore providing incorrect results.
SPI software
SPI software is the premier software for automated testing, report generation, and maintenance record keeping of all primary injection and low voltage circuit breaker tests.
Includes complex breaker curves
The SPI software includes report generation for all testing. Thus, the user can not only perform all the primary injection testing required and generate a report for an end customer or for historical purposes.

About the product
The SPI225 is a high current primary injection test system for all forms of high current testing required in a substation, including testing overcurrent relays, circuit breakers, motor overloads, and current transformers. A single SPI225 is designed to test low voltage molded-case circuit breakers up to a rating of 225 A.
The SPI system allows the user to type in a predetermined current and the SPI system will generate and regulate the requested high current. The SPI system also has the unique ability to turn on at the current zero crossing every time for any load by automatically adjust the output firing angle. This eliminates DC offset for every circuit breaker type and the need for the user to determine and adjust the firing angle for different loads and circuit breakers.
All SPI systems are both fully automated and/or manually controlled. The Smart Touch View Interface (STVI) gives you the ability to manually control the unit and also perform automated testing. The SPI225 can also be controlled by a PC for fully automatic testing and report generation.
Technical specifications
- Max output current (AC)
- 2000 A
- Output type
- Automatically regulated
Product documents
Software and firmware updates
SPI225
Installation Instructions
USB Memory Stick:
- With the SPI and STVI powered up, insert the USB memory stick into the USB port on top of the STVI.
- Press the Configuration Screen button, and then press the Update Firmware button in the Configuration Screen.
- At that point the user will be presented with the IP Address selection screen, with the serial number of the unit. Select the unit by touching the serial number and the upgrade process will automatically start. That’s all there is to it.
- Observe the STVI display screen, and the unit. At the completion of the download, there will be an instruction to reboot (turn off and back on) the test system.
PC and STVI Software:
- If using the PC version of the STVI software, it is very similar to the STVI. Upon clicking on the Update Firmware button, the familiar Windows Open File browser dialog box will appear.
- Using the Look In pull-down menu, navigate to where the new firmware was downloaded onto the PC, click on the file SPI_Firmware__X.XXX.ldr (SPI Loader).
- You will be requested to select a unit from the IP Address screen. Select the unit by clicking on the serial number and the upgrade process will automatically start.
- At the completion of the download, there will be an instruction to reboot (turn off and back on) the test system.
- Note that after rebooting the SPI unit, if using the PC version of the STVI software you will have to restart the STVI software on your PC in order to regain control of the SPI unit
PowerDB Software
Onboard install files are for FREJA, RTMS, SMRT and STVI local device installation.
PC install is for remote operation of a wide range of Megger test instruments including FREJA, RTMS, SMRT, STVI and BITE5.
FAQ / Frequently Asked Questions
In most cases the SPI will run on a generator, but if the generator has large frequency fluctuations, it will cause the SPI not to be able to match frequency. Typically an inventor generator works best.
Yes. The phase angle into the SPI is the same as the phase angle out of the SPI. Therefore in order to parallel or series outputs, they must be on the same phase.
The SPI225 senses input voltage at start up and automatically switches internal taps to get the most power output based on input voltage. Therefore the unit achieves near the same output at 120V or 240V. The only limitation is if the input voltage drops during tests.
To get maximum output, a strong source is required. The manual requests a 20 amp services if using 120V. If a long extension cord is used the voltage at the end of the cord will have a large voltage drop at high current. If the input voltage drops, the output will also drop. The unit can work on 120V or 240V. If 240V is used the input current decreases and voltage drop becomes less of an issue.
When testing breakers the leads should be as short as possible. 2ft leads are recommended. If you need longer leads you can series two units together and get higher output.