Main functions of data center computer room The Use and Principle of Current Transformer Acrel Support Olympic Winter Games Beijing 2022 Power Supply Solution for Winter Olympics Wireless Temperature Solution at Beijing Daxing International Airport Acrel Releases ADW300 with 333mV Access Energy meters used in urban comprehensive pipe gallery projects Base Station Energy Consumption Monitoring Solution Application of Residual Current Monitor in Street Lighting Discussion on the Combination of MQTT Comprehensive Insights into Temperature Measurement in Industrial Processes DIN Rail Energy Meters: A Comprehensive Guide Operational Principles of Medium Voltage Protection Relays Working Principles and Wiring of Various Types of Electric Meters Digital Electric Energy Meter VS Electronic Electric Energy Meter Problems and Common Fault Analysis of Current Transformers During Operation Detection and Marking of Current Transformers The Functions and Working Principles of Current Transformers Application of DC Current Meters in Substation DC Measurement Operation Methods and Precautions of Current Transformers The Detection and the Open Circuit Fault Inspection of Current Transformers Models, Structures and Installation Methods of Different Hall Current Sensors The Working Principles of the DC Current Shunts How to Set the Temp and Humidity Controller? Precautions of Multifunction Meter Storage Principle and Characteristic Parameters of Hall Current Sensor Multi-function Instrument Definition and Troubleshooting The Use of Prepayment Energy Meter and Its Advantages over Induction Meter Basic Functions of Smart Prepaid Electricity Meter in Student Dormitories How to Use the Multi Function Energy Meter? What Functions Does It Have? Factors That Affect the Performance and Use Value of Prepayment Energy Meter Application of ​IoT Based Electricity Energy Meter Application of Wireless Temperature Sensor in Press What is the Significance of Smart Energy Meter Applications? Smart Energy Meter Application What Are the Common Faults of Current Transformers? Operation Precautions of Current Transformers and the Cause of Burning The Principle and Use of Through-core Current Transformers The Wiring Principle of Current Transformers Design Features of Wireless Temperature Sensors Errors of Daily Current Transformers Common Problems and Solutions of Multifunctional Power Meters A Brief Introduction to the Application and Specifications of DC Shunts What Do You Need to Know to Apply DC Shunts? What Are DC Shunts Made Of? Precision DC Shunts Are High Precision Resistors That Are Critical to Precision Requirements and Accuracy Application Analysis of Current Transformers Fixing Method of Split Current Transformer What is a Smart Gateway? The Difference Between Current Transformer and Zero Sequence Current Transformer Can Ordinary Current Transformers Be Used As Zero-sequence Current Transformers? Structural Difference Between Through-core Current Transformer and Ordinary Current Transformer Wiring Principle of Through-core Current Transformer Introduction to the Principles of Use of Open Current Transformers The application scope of zero sequence current transformer is introduced Standard for operation of three-phase integrated current transformers Installation and use of current transformer How to choose the core type of open current transformer? Working Principle, Structure, and Method for Determining Saturation Point of Current Transformer Confirmation of Current Transformer Saturation Level and Accurate Measurement of Saturation Points Inspection of Connection of Current Transformers Causes and Preventive Measures of Burnout in Current Transformers What Is the Reason for Burnout of Current Transformers During Use? Differentiation of Types of Current Transformers Installation Requirements and Fixing Methods of Split Core Current Transformers Considerations for Operating Current Transformers Issues and Solutions for Installation of Zero-Sequence Current Transformers What Are the Issues to Be Aware of During the Operation of Open-Type Leakage Current Transformers? Application and Requirements of Zero Sequence Current Transformers Principles, Functions, and Classification of Zero-Sequence Current Transformers Main Technical Requirements for Current Transformers Fault Detection and Handling Methods for Open-circuit and Short-circuit on the Secondary Side of Current Transformers Misconceptions in the Use of Current Transformers and Precautions in Work Teaching You the Correct Use of a Through-core CT Current Transformer Operation Considerations and Installation Methods of Split-core Zero-sequence Current Transformers What Do These Parameters Represent in the Din Energy Meter? Main Performance of Open-Type Current Transformers Selection and Calculation of Actual Usage of the Din Energy Meter Things You Don't Know About the Din Energy Meter What Functions Does the Multi-functional Smart Din Rail Electricity Meter Have? Breaking Barriers: How Wireless Technology Transforms Temperature Monitoring in Industry From Factory Floors to Warehouses: Industrial Applications of Wireless Temperature Monitoring Systems Smart Solutions for Energy Monitoring: Harnessing DC Digital Multifunction Meters Smart Energy Monitoring Made Simple: The Magic of Multi-Function Energy Meters Understanding DC Digital Multifunction Meters: Features and Applications Demystifying DIN Rail Meters: A Comprehensive Guide to Their Functionality From Voltage to Current: The Versatility of DC Digital Multifunction Meters Din Rail Meters: Unlocking Precise Energy Measurement in Your Electrical System Choosing the Right Din Rail Meter for Your Specific Energy Monitoring Needs Cutting the Cords: Advantages of Industrial Wireless Temperature Monitoring Systems Saving Energy, Saving Costs: How DIN Rail kWh Meters Make a Difference Streamlining Energy Monitoring: Advantages of DIN Rail Mounted Electricity Meters Efficient Energy Monitoring: Unleashing the Power of DIN Rail kWh Meters Maximizing Space and Functionality: The Benefits of DIN Rail Mounted Meters Unlocking the Potential: Applications of DIN Rail Mounted Electricity Meters A Closer Look at DIN Rail kWh Meters: Features and Applications Efficiency Redefined: How Multi-Function Energy Meters Are Transforming Energy Management Unlocking Energy Insights: The Advantages of Multi-Function Energy Meters From Factory to Field: Industrial Wireless Temperature Monitoring Solutions Precision in Production: The Role of Industrial Wireless Temperature Monitoring Behind the Scenes: How Hospital Isolated Power Systems Keep Healthcare Facilities Running Powering Patient Care: the Importance of Hospital Isolated Power Systems Measuring the Flow: The Science behind DC Current Meter Shunts Powering Your World: How to Select the Ideal Power Meter Supplier Efficiency in a Compact Package: The Benefits of Din Rail Electric Meters Empowering Efficiency: The Role of a Power Monitoring Device Overview of the importance of temperature monitoring in various industries How Does a Multi-Function Energy Meter Compare to Traditional Energy Meters? Do you Know a DC kWh Power Meter? Your Essential Guide on How to Use DC Current Meter Shunts The Role of Isolated Power Panels for Healthcare Facilities Unveiling the Significance of DIN Rail Electricity Meters Unveiling the Soaring Popularity of DIN Rail Electricity Meters How to Choose the Right Multi-function Meter for Your Needs? Din Rail Electricity Meter: Smart Choices for Efficient Energy Management Types of Prepaid Meters: Navigating Efficiency in Commercial Power Management Unveiling the Contrasts between Credit and Prepayment Energy Meters Single Phase vs Three Phase Digital Energy Meters: Powering Industrial Efficiency How Do I Install a DIN Rail Energy Meter? How Can a 3 Phase Digital Energy Meter Help Identify and Detect Power Imbalances? Dc Kwh Meter Provides Kwh-Based Charging for Dc Wallboxes The Future of Isolated Power Panels in Hospitals

The Principle and Use of Through-core Current Transformers

1. The principle of through-core current transformers

The feed-through current transformer itself is not a primary winding, and the current-carrying (load current) wires from L1 to L2 pass through a circle (or other shape) made of silicon steel sheet rolling to play the role of a primary winding. The secondary winding is directly and evenly wound on the circular dead center, and is connected in series with the secondary loads of the current coils such as instruments, relays, and transmitters to form a closed loop.

Since the feedthrough current transformer does not have a primary winding, its transformation ratio is determined according to the number of turns that the primary winding passes through the dead center of the current transformer. , the larger the transformation ratio, the ratio of the rated current: in the formula I1——a rated current when one turn through the center; n——the number of turns through the center.

Compared with the common CT current transformer, the wiring of the through-core current transformer, the primary side passes through the P1 side of the transformer, and the P2 side comes out, and the secondary side wiring is the same as that of the common current transformer.

During the measurement, the circuit impedance of the secondary circuit of the current transformer is very small, so the secondary circuit of the current transformer is close to a short circuit, and in order to unify the standard, the rated value of the secondary winding is generally designed to be 5A. In practical applications, for safety consideration, the secondary side S2 of the current transformer generally needs to be grounded.

2. Correct use of through-core current transformers

Feed-through current transformer is a common electrical device with simple wiring and convenient installation. It is widely used in metering, testing and maintenance lines. If you are not careful during use, it will cause great errors, resulting in inaccurate measurement, maintenance failure, and electrical accidents. Therefore, you should pay attention to the use method.

The transformation ratio of the current transformer should meet the requirements of the load current, and the normal load current should be 1/3 to 2/3 of the primary rated current of the current transformer. A current transformer with an accuracy level of 0.2S or 0.5S should be selected.

When piercing the heart, the terminal marked "L1" or "+" in the primary circuit should be connected to the incoming power line, and the terminal marked "L2" or "-" should be connected to the outgoing wire. The terminal marked with "K1" or "+" in the secondary circuit should be connected with the incoming terminal of the current coil of the electric energy meter, and the terminal marked with "K2" or "-" should be connected with the outgoing terminal of the electric energy meter.

The key to the use of feed-through current transformers is that the number of turns of the feed-through must be correct, not only the conversion ratio indicated on the nameplate, but also the number of turns of the feed-through. The number of feed-through turns is equal to the ratio of the primary side current when the feed-through turns is one turn to the primary side current corresponding to the conversion ratio.

The terminal, shell and iron core of "K2" or "-" of the secondary circuit of the current transformer must be grounded stably.

Related Articles about Acrel



Popular Acrel Energy Meter Products Recommended