Innovation in Current Transformer Technology, Leading The New Era of Smart Grid with Four Major Product Categories

As the "sensing organ" of the power system, current transformers play a core role in current monitoring, energy metering, and system protection. Faced with the wave of smart grid and new energy grid integration, its classification and technology are undergoing revolutionary upgrades.

1、 Basic classification: Comprehensive coverage of power system requirements

According to the installation method, current transformers are divided into through type, pillar type, bushing type, and busbar type. Among them, busbar type products greatly simplify the distribution structure by directly fitting the busbar design. According to their purposes, they are divided into two types: measurement and protection. The former provides high-precision current signals for measurement (with an error of ≤± 0.2%), while the latter transmits transient currents at the moment of fault to ensure system safety. In the field of insulation, epoxy resin casting products have gradually replaced traditional oil immersed products due to their high mechanical strength and good flame retardancy, becoming the mainstream choice for medium voltage scenarios.

2、 Technological Breakthrough: Dual Leap of Precision and Intelligence

The new generation of products is breaking through traditional limitations:

High precision materials: Puke Technology uses nanocrystalline alloy iron cores, with a linear error of only ± 0.1% in the frequency range of 50Hz-10kHz, which can capture ns level spikes of IGBT switches;

Quantum sensing: The diamond NV color center transformer developed by University of Science and Technology of China and Guosheng Quantum has achieved international top precision of 0.05% and has been put into operation for the first time in a 110kV substation;

Function integration: The busbar type product of Dalian Second Transformer integrates live display function, providing real-time feedback on line status and reducing operation and maintenance troubleshooting time by 30%;

Installation Revolution: Haiyan Lingfei's retractable bushing transformer can be installed without cutting the cable, completely solving the pain point of power outage renovation.

3、 Selection Guide: Matching Scenarios to Unleash Technical Value

Industrial control scenario: Recommend wideband (DC-500kHz) dry-type transformers to adapt to harmonic environments of frequency converters;

Smart grid monitoring: Quantum or optical transformers meet the 0.05% ultra precision requirement;

Renovation project: Prioritize the use of open close design (such as Shandong Yuanxing patented products) and support live installation.

Future trend: With the promotion of "quantum+power" by institutions such as Anhui Electric Power Research Institute, current transformers are upgrading from single measuring elements to multi parameter sensing terminals. It is expected that by 2030, the share of high-precision products in the global power and distribution industry will exceed 42%