As the energy landscape evolves, smart grids are at the heart of integrating renewable energy sources. By leveraging digital technologies, they optimize power distribution, enhance grid stability, and enable the seamless incorporation of renewables. A crucial element of this transformation is the adoption of IEC 61850-based communication systems*, ensuring interoperability and scalability across networks.
To integrate these protocols effectively, utilities need cost-efficient, reliable, and scalable solutions for monitoring, measurement, and control. However, traditional instrument transformers (ITs) struggle to meet these demands due to their size, efficiency limitations, and lack of adaptability for modern grid applications.
LPITs – The Smart Alternative
This is where Low-Power Instrument Transformers (LPITs) come in. These innovative transformers offer higher measurement accuracy, reduced space requirements, and lower capital expenditures (CAPEX) for utilities. A prime example of cutting-edge LPIT technology is Greenwood-Power's product line, which utilizes resistive-capacitive voltage dividers and inductive measurement principles with shunt resistors.
Product examples:
To be certified as a reliable component in power grids, LPITs, like conventional ITs, must meet rigorous IEC-standardized testing, including:
- Lightning impulse tests (IEC 61869-1)
- High-voltage tests (IEC 60060-1)
- Thermal endurance tests
- Short-circuit withstand tests
Examples of type test results:
Beyond cost and space savings, LPITs provide game-changing benefits:
- Expanded frequency range – Enables harmonic measurement for enhanced power quality monitoring
- Flexible installation in utility applications– No need for correction factors, independent of mounting position
- Enhanced safety – Low output voltages eliminate health risks for technicians
- Sustainable design – Reduced CO2 emissions and minimal use of rare minerals
- Superior efficiency – Up to 92% less material usage and over 90% higher energy efficiency compared to conventional solutions
Proven Success: Real-World Deployments
The scalability and adoption of LPITs are already evident through large-scale installations: Their interoperability allows seamless integration with a wide range of measurement and protection devices. In measurement applications, LPITs enable precise power quality analysis and the detection of voltage and frequency deviations. For protection, they play a crucial role in earth-fault detection and overvoltage protection. Below is a list of major deployments showcasing their increasing adoption in modern power systems.
- Over 300,000 LPVTs installed in GIS switchgears of utilities all over Saudi Arabia for diverse measurement and protection use-cases (2019–2024)
- More than 100,000 LPCTs deployed in European gas as well as air-insulated switchgears through partnerships with Siemens and other switchgear manufacturers (since 2020)
- Over 10,000 LPVTs implemented in AIS systems worldwide in 2024 aloneÂ
Installation examples:
Challenges & Future Outlook
Despite their the advantages, global standardization remains a challenge. The lack of ANSI and IEEE standards has slowed adoption, and some protection and measurement devices are not yet fully optimized for LPIT interfaces. However, the industry's rapid shift toward digital substations suggests that standardization and broader integration are on the horizon.
The Future of Smart Grid Measurement
With proven performance in generator, transformer, and network protection automation, LPITs enhance grid monitoring and contribute to power quality optimization. Their widespread adoption across Europe, Saudi Arabia, and beyond underscores their scalability and long-term viability.
As energy networks modernize, LPITs will be a key driver of the next-generation smart grid infrastructure — offering utilities a powerful combination of efficiency, safety, and sustainability.
BTW: If you're interested in learning more and want to experience the products firsthand, feel free to meet us at this year's Distributech in Dallas, Texas! We'll be there all three days at Booth 6350. Expert tip for all coffee lovers: Stop by in the morning for a free coffee! ☕
*IEC61850 defines communication protocols for seamless data exchange between  intelligent electronic devices in substations. The standard facilitates efficient, real-time communication, enhancing automation, monitoring, and control within modern power systems.