Residual CT Series: Flexible Installation, Superior Balance

Fast Installation

High Accuracy

Full Range

High Precision Residual CT

Compact and flexible design with circular open-close structure, suitable for cable diameters ranging from 20mm to 65mm, allowing easy installation and manual operation.

 

High accuracy and reliability, meeting multiple precision grades (0.2, 0.5, 1) and complying with national standards GB-14287.2-2005 and GB-14287.2-2014, ensuring consistent and precise current monitoring.

 

Excellent balance characteristics and strong electromagnetic interference resistance, effectively reducing false alarms and providing dependable performance in smart power systems, fire leakage detection, and electrical safety applications.

Application scenarios

Motor Control

Industrial motor control system

Power Distribution

High and low voltage distribution cabinet & power distribution room

Renewable Integration

PV & wind power new energy grid connection

Energy Monitoring

Building & park energy consumption metering management

Automation Control

Inverter and automatic industrial control equipment

Grid Protection

Substation and power relay protection

Technical Overview and Performance Data

Maximum Withstand Voltage
0.66kV
Rated Primary Current
0A ~ 300kA
Rated Secondary Output
With integrator:
4V / 1A (AC) or 4–20mA (DC)
Without integrator:
100mV/kA, 50mV/kV
Accuracy
1%

10%-100% Accuracy
5% (without integrator) 1% (with integrator, 45-65HZ)

Phase error
W+1°(45-65HZ) W+10°(20KHZ)
Auxiliary Power Supply
±12V, 24V, 5V DC or 220V AC
Power Consumption
≤10W
Operating Frequency
1Hz – 1MHz
Note: Other specifications can be customized according to customer requirements.
 
Performance Index
10%-100% Accuracy
5% (without integrator) 1% (with integrator, 45-65HZ)
Phase error
W±1° (45-65HZ) W±10°(20KHZ)
10%-100% Linearity
0.50%
Integrator power supply
7-30VDC
Response bandwidth
1HZ-1MHZ
Coil section diameter
W7.5、W10、W12mm or Custom made
Coil length
W2M or Custom made
Use altitude
W2000M
Protection level
IP65
Texture of material
Silicon rubber
Secondary lead
Shielded wire,length customized
Compressive strength
2KVAC/min
Insulation resistance
DC500V/100MQ
Electrical Parameters
Working frequency50~400Hz
Rated input10mA~5A
Measuring range10%In~130%In
Rated output0-1V or 0-0.5mA
Ratio difference≤+0.1%
Phase difference≤+10 points
Dielectric strength2.5KV/1mA/1min
Insulation resistanceDC500V/1000MΩ /min
Mechanical Parameters
ShellABS, Flame retardant grade 94-V0
SkeletonPBT
Iron coreNickel or nanocrystalline
Intermal structureEnvironment friendly epoxy resin casting
Construction planScrew fixation
Working temperature-12°C~+45°C
Ambient humidity≤85%
Connection modeTerminal type / shielded strand 1.5m

Note:  Other specifications can be customized according to the specific requirements of customers.

Outline and Installation Dimensions

Model and Specification Rated Input Rated Output Accuracy Class Dimensions (mm)
Φ A B C
CTK/N-16 0~1A 0~1V (0.5mA) 0.2
0.5
1.0
16mm 50.6 44 20
CTK/N-20 20mm 65 56 22
CTK/N-30 30mm 72.5 64 24
CTK/N-45 45mm 95 85 24
CTK/N-65 65mm 119 105 24

Certificates & Accreditation

We proudly showcase our enterprise honors and management system certifications, reflecting our commitment to quality, reliability, and industry excellence. These certificates demonstrate our dedication to maintaining high standards in all aspects of our operations.

           

Equipment Image Information

Explore detailed images of our equipment, showcasing the advanced technology, precision engineering, and robust build quality that support our high-performance operations. Each image is accompanied by informative descriptions to provide a comprehensive understanding of our machinery.

Fully automated sensor core continuous tunnel heat treatment furnace production line

Contact Us

8 fully automatic high-speed & 14 continuous precision stamping presses

Contact Us

24 Fully Automatic Magnetic Core Winding Machines

Contact Us

6 Fully Automated Sensor Core Continuous Tunnel Heat Treatment Furnace Production Lines

Contact Us

6 Fully Automatic Testing & Sorting Machines

Contact Us

2 Solenoid (Tripper) Manufacturing Lines

Contact Us

6 Fully Automatic Magnetic Core Packaging Machines

Contact Us

260 Fully Automatic Winding Machines

Contact Us

8 fully automatic current transformer potting machines

Contact Us

2 Current Transformer Assembly Lines

Contact Us

Winding Production Line Workshop 2

Contact Us

6 Fully Automatic Magnetic Core Testing Machines

Contact Us

Large Magnetic Core Continuous Furnace

Contact Us

Strip Slitting & Cutting Production Line

Contact Us

5 Fully Automatic Ultra-Microcrystalline Heat Treatment Lines

Contact Us

Technology Dept / R&D Center / Material Testing

Discover our Technology Department, R&D Center, and Material Testing facilities through detailed images. These showcase our commitment to innovation, rigorous research, and precise material analysis, ensuring the highest quality and reliability in every product we develop.

View More

Roche Coil Transformer (flexible Opening Transformer) – CTLS4

A flexible Rogowski coil current sensor designed for accurate AC current measurement in large, irregular, or hard-to-access conductors. It features an openable structure for easy installation and is suitable for both temporary and long-term monitoring applications.

Read More »

Roche Coil Transformer (flexible Opening Transformer) – CTLS3

A flexible Rogowski coil current sensor designed for accurate AC current measurement in large, irregular, or hard-to-access conductors. It features an openable structure for easy installation and is suitable for both temporary and long-term monitoring applications.

Read More »

Roche Coil Transformer (flexible Opening Transformer) – CTLS2

A flexible Rogowski coil current sensor designed for accurate AC current measurement in large, irregular, or hard-to-access conductors. It features an openable structure for easy installation and is suitable for both temporary and long-term monitoring applications.

Read More »

Roche Coil Transformer (flexible Opening Transformer) – CTLSX

A flexible Rogowski coil current sensor designed for accurate AC current measurement in large, irregular, or hard-to-access conductors. It features an openable structure for easy installation and is suitable for both temporary and long-term monitoring applications.

Read More »

About Us

Jiangyi Yucheng Electric, Jiangsu, China, makes current sensors and smart meters for global power and industrial applications, offering reliable, high-accuracy, standards-compliant solutions.

Contact Info

No.5 Tongxin Road, Qingyang Town,Jiangsu,China