The core difference between DP current transformer and traditional current transformer lies in four aspects: structural design, working principle, performance characteristics and application scenario. The specific analysis is as follows:
1. Structural design differences.
Conventional Current Transformer
It adopts a closed-core winding structure, in which the primary winding is connected to the test circuit in series and the second winding is connected to the measuring instrument or protective device.
Installation methods are mostly fixed or plug-ins that require wiring installation to be switched off, making it difficult to retrofit a system that is already running.
Typical structures, including penetrating, pillar type and sleeve type, are suitable for standard distribution cabinets or outdoor scenes.
DP Current Transformer (Take the Open and Closed Type as an Example)
Adopts the retractable structure, can be fastened directly on the bus or cable, does not lose power, greatly improves installation convenience.
Window design adapts to the busbar and cable of multiple specifications, can flexibly adapt to conductors of different sections, reduces the field decoration work.
Some models use circular windows or pre-wired terminals to further simplify the installation process.
2. Working principle and performance characteristics.
Conventional Current Transformer
According to the electromagnetic induction principle, current conversion and isolation are realized by coupling the current of a single winding and the current of a second winding through the iron core.
Accuracy levels are generally 0.2 or 0.5, in line with general measurement requirements, and protection-level transformers require saturation capability resistance to ensure accurate transmission under fault currents.
It is strictly forbidden to drive sideways twice, otherwise dangerous voltages of 1000 volts may be generated, threatening the safety of equipment and personnel.
DP Current Transformer
High linearity and low phase difference: Optimization iron core materials and winding processes to reduce the impact milliampere level errors on energy metering or protection actions.
Stable temperature drift characteristics: adapt to temperature fluctuation environments, ensure long-term stable operating accuracy.
Rapid response capability: Some models use electronic or optical principles to reduce response time to microseconds to meet the requirements of dynamic load monitoring.
interference design: optimization of shielding structures and processing algorithms for electromagnetic jamming and harmonic pollution.
3. Application scenarios and functional positioning.
Conventional Current Transformer
Measurement scenario: suitable for current monitoring of common distribution lines such as factory power cabinets and commercial buildings.
Protection scenario: with relay protection devices, realize fast troubleshooting of overload, short circuit and so on.
Measurement scenario: For energy settlement, accuracy requirements of 0.2S or 0.5S need to be met to avoid measurement disputes.
4.DP Current Transformer
measurement scenarios such as smart distribution cabinets and energy management systems require high-precision input of current signals to support data analysis and optimization decisions.
Non-blackout renovation scenario: upgrading of old distribution systems or setting up of temporary monitoring points to avoid the impact of power outages on production and operations.
Scenario of special working conditions:
Adverse environment: high temperature, high humidity, dust environment in metallurgy, chemical industry, etc.
New energy system: adapts to the characteristics of current fluctuation in photovoltaic and energy storage scenarios, supports large-scale current measurement and rapid response.
Rail transit: Train contact network monitoring needs high isolation voltage and anti-jamming ability to ensure the stability of signal transmission.