News | company news | Mar 01,2024
What is the difference between closed type transformer and split core type?
Closed-type transformers and split-core transformers are two commonly use devices for measuring current in power systems. The main difference between them lies in the internal structure and working principle.
Closed type transformer:
A closed-type transformer is usually a complete toroidal core with a conductor for measuring current passing through a central hole in the core.
The toroidal shape of the core allows the transformer’s induction coil to completely close around the current conductor. According to Faraday’s law, and therefore the law of electromagnetic induction when a current passes through a wire, the surrounding magnetic field is present. The wire induces a voltage signal.
This voltage signal passes through the secondary coil. of the transformer, ultimately used to measure current.
Closed transformers have the advantages of simple structure and convenient installation, and are suitable for real-time monitoring and measurement of power systems.
Split core transformer:
Split core transformers usually consist of a main transformer. core and several auxiliary cores.
Since the primary core is a toroidal core, the secondary core is realize by multiple individual placements. So the core is in the center hole of the primary core.
Each independent core is surrounded by a pair of windings, one of which is in series with the main conductor and the other is used to output the current signal.
Split-core transformers measure current by passing the primary conductor through the main core while passing the secondary conductor through each individual core.
Because each individual core senses current independently, relatively accurate current measurements are obtained.
Switching core transformers are generally more suitable for use in complexes. Power systems are therefore better than enclosed transformers as they provide more accurate current measurements and can accommodate a wider range of currents.
Generally speaking, closed-type transformers are suitable for general current measurement needs, while open-type transformers are more suitable for occasions with higher current measurement accuracy requirements or more complex power system structures.
--- END ---
Prev: 2024 US Exhibition
Mar 04, 2026
HYCA-01 Residual Current Detection Module: A reliable leakage current monitoring solution for EV charging stations in tropical regions such as Malaysia. With the rapid development of electric vehicle infrastructure in Southeast Asia, the electrical safety of EV charging systems has become increasingly important. In tropical countries such as Malaysia, Thailand, Indonesia, and Singapore , power… Continue reading Why HYCA-01 residual current detection module Ideal for EV Charging Stations in Tropical Regions?
Feb 25, 2026
Two-wire current transmitter: Integrated vs. Split type —In-depth analysis current transmitter of Korean IoT energy monitoring and smart power distribution market In Korea’s industrial and building energy management systems, current monitoring devices are rapidly upgrading from traditional meters to real-time data nodes that can be connected to IoT gateways. Especially in BEMS, FEMS, smart factories,… Continue reading Split-Core vs Integrated 4-20mA Current Transmitter in Korea IoT Gateway
Feb 12, 2026
I am looking for a way to match type transformers with residual current circuit breakers. I want split type current transformers to match circuit breakers perfectly. The KCT series provides the basis, for this analysis and the application scenarios. In my work, with power distribution systems I see that residual current circuit breakers, also called… Continue reading Why split type current transformers Work with RCDs
COPYRIGHT © HEYI ELECTRICS SOLUTION
