Description
1. Product Introduction
GE CT12AUF2KOMA is an indoor epoxy resin cast high-precision current transformer, a core primary device for medium and low-voltage power distribution systems. It is developed for industrial switchgears, substation auxiliary power systems, factory intelligent power distribution and power energy monitoring applications. Integrating precision energy metering and relay fault protection, the device linearly and accurately converts high primary current in power distribution circuits into standard low secondary current signals, supplying stable and authentic current sampling data for power measurement modules, protection relays, power meters and upper-level energy management systems.
Adopting fully-sealed vacuum integral casting technology, the product eliminates common defects of traditional current transformers such as moisture ingress, dust accumulation, insulation aging and sampling distortion. It is suitable for harsh operating conditions inside distribution cabinets featuring high temperature, heavy dust and strong electromagnetic interference. Benefiting from excellent linear transmission characteristics, outstanding anti-saturation capability and stable thermal and dynamic withstand performance, it satisfies full-range operational requirements including steady-state industrial metering, load monitoring and transient protection against short-circuit faults. As an original matching device for GE PMC power monitoring systems and Multilin protection relays, it is widely deployed in new power projects, technical retrofits of legacy power distribution systems, replacement of faulty current transformers and routine spare part inventory for enterprises.
2. Core Structure & Material Characteristics
2.1 Core and Winding Structure
It adopts cold-rolled silicon steel core with high magnetic permeability, featuring extremely low magnetic loss and uniform magnetic circuit, which effectively reduces ratio error and phase error during current transformation and guarantees sampling linearity across the full load range. Windings are precisely wound with high-purity enameled copper wire featuring accurate turn ratio and uniform insulation layers. They withstand long-term heating under energized conditions and frequent load fluctuations, preventing inter-turn short circuits and winding aging failure, and ensuring long-term operational accuracy and stability from the core structure.
2.2 Fully Cast Sealed Insulation Structure
The whole unit adopts industrial-grade epoxy resin vacuum casting technology. The internal core, windings and insulation materials are fully sealed and solidified without air gaps or exposed live components. The monolithic structure delivers superior dielectric strength, creepage resistance and breakdown resistance. It effectively blocks ingress of dust, moisture and corrosive gas on site, preventing faults including moisture-induced leakage current, insulation degradation and partial discharge. It is suitable for year-round uninterrupted enclosed operation inside indoor switchgears.
2.3 Enclosure & Mechanical Structure
The enclosure is made of high-strength flame-retardant epoxy resin with high mechanical hardness, impact resistance and vibration resistance. It withstands mechanical vibration generated by equipment startup/shutdown and short-circuit impacts inside switchgears without structural deformation or cracking. The compact embedded cabinet design fits standard mounting dimensions of medium and low-voltage switchgears, featuring tidy wiring and small footprint. Clearly arranged terminal blocks facilitate on-site installation, wiring commissioning and later inspection and verification.
3. Technical Advantages
3.1 Dual Function for Metering & Protection with Controllable Accuracy under All Operating Conditions
Different from single-function transformers, this model supports both precision metering and fault protection. Under light, rated and heavy steady-state loads, it achieves minimal current transformation error and excellent linearity, meeting high-precision requirements for industrial energy consumption statistics, load monitoring and energy metering. In the event of system short-circuit or instantaneous overload faults, the core provides prominent anti-saturation performance without waveform distortion or data aberration. It completely restores the transient waveform of primary fault current, enabling downstream protection relays to accurately identify faults and operate reliably, avoiding power safety incidents caused by protection failure or maloperation.
3.2 Superior Insulation Performance for High Operational Safety
It has passed rigorous power tests including high-voltage insulation test, power frequency withstand voltage test and partial discharge test. Its insulation class adapts to medium and low-voltage power distribution systems, tolerating long-term grid voltage fluctuation and electric field interference without risks of creepage, breakdown or electric leakage. The fully sealed structure thoroughly isolates ambient moisture and dust, eliminating common moisture-related failures of transformers in humid southern regions and dusty workshops, and significantly lowering electrical hazards in power distribution systems.
3.3 Excellent Thermal & Dynamic Stability to Resist Grid Impacts
Targeting industrial power distribution characteristics of severe load fluctuation and frequent short-circuit impacts, the device features optimized core and winding load design with sufficient margin for short-time thermal and dynamic stability. It withstands thermal stress and electrodynamic shock caused by sudden system short-circuit current, without overheating burnout or structural deformation under instantaneous heavy current. It reliably adapts to complex operating conditions including frequent start-stop of industrial production lines, load variation and grid fluctuation, delivering strong anti-risk capability.
3.4 Industrial Three-Proof Design for Long-Term Maintenance-Free Operation
The whole unit is dustproof, moisture-proof, anti-corrosive, flame-retardant and anti-aging. It has passed strict cycling temperature tests, humidity aging tests, EMC tests and vibration & shock tests. Free of moving vulnerable parts, it requires no regular calibration or special maintenance during operation, supporting 24/7 unattended continuous operation all year round with an extended maintenance-free cycle, greatly reducing operation and maintenance costs and inspection workload of power systems.
3.5 High System Compatibility & Versatility
Standard secondary current output conforms to industrial specifications. It is natively compatible with GE full-range power automation systems and seamlessly matches GE PMC power monitoring modules and Multilin protection relays for plug-and-play deployment without protocol conversion or parameter adjustment. Meanwhile, it supports mainstream DCS measurement systems, intelligent power meters and energy consumption acquisition terminals available on the market. It can directly replace legacy transformers of equivalent specifications without cabinet modification or secondary wiring changes, suitable for various technical renovation and replacement scenarios.
4. Technical Specifications
4.1 Basic Specifications
Model: CT12AUF2KOMABrand: GE Vernova (GE Multilin)Type: Indoor epoxy resin cast current transformerFunction: Integrated measurement, metering and relay protectionMounting: Embedded fixed installation inside switchgearApplicable Systems: Industrial medium & low-voltage power distribution systems, substation auxiliary power systems, GE PMCS Energy Management SystemCore Functions: Primary current acquisition, secondary signal conversion, energy consumption metering, grid load monitoring, sampling for short-circuit fault protection
4.2 Electrical Performance Parameters
Operating Mode: Power frequency AC current samplingTransformation Characteristics: High linearity, low ratio error, low phase error, stable accuracy across full load rangeSaturation Characteristics: Excellent anti-saturation performance, high fidelity for transient fault waveform restorationThermal Stability: Resists thermal impact of short-time short-circuit current without overheating damageDynamic Stability: Withstands electrodynamic shock from short-circuit without structural or winding deformationInsulation Performance: High withstand voltage level, low partial discharge, long-term stable insulation propertyOutput Characteristic: Standard secondary current output complying with general standards for industrial power sampling loops
4.3 Environmental Parameters
Operating Temperature: -20℃ ~ +70℃Storage & Transport Temperature: -30℃ ~ +85℃Operating Humidity: 5%～95%RH (non-condensing, no corrosive gas)Environmental Resistance: Dustproof, moisture-proof, anti-corrosive, flame-retardant, anti-aging, anti-mechanical vibration, anti-electromagnetic interferenceOperation Mode: Supports 24/7 unattended continuous operation all year roundApplicable Locations: Enclosed high/low voltage power distribution rooms, industrial workshop switchgears, substation auxiliary power distribution rooms
5. Operating Principle
GE CT12AUF2KOMA current transformer achieves precise current signal transformation based on the law of electromagnetic induction with a closed-loop and stable working process. Installed in series on the primary power distribution main circuit, the primary conductor passes straight through the center of the transformer core. When load current flows through the primary circuit, alternating current generates uniform alternating magnetic field inside the core. Supported by high-permeability core for efficient magnetic coupling, the magnetic field is stably transmitted to the secondary winding. Electromagnetic induction generates reduced low secondary current signals in the secondary winding strictly in accordance with the specified transformation ratio.
During steady-state normal system operation, the device performs current transformation with low loss and high precision, converting high primary current into standard signals recognizable by downstream equipment, providing accurate data for energy metering, load monitoring and energy consumption statistics. In case of sudden faults such as short circuit and instantaneous overload in power distribution systems, its superior anti-saturation property prevents current waveform distortion caused by core magnetic saturation. It fully captures transient variations of fault current and transmits authentic fault current signals to protection relays, driving reliable protection operation to rapidly isolate faulty circuits, prevent fault propagation and secure equipment and operation of power distribution systems. Meanwhile, the fully sealed insulation structure isolates ambient interference throughout operation and ensures stable signal transmission without abnormal distortion under all working conditions.
6. Application Scenarios
6.1 Supporting for Industrial Medium & Low-Voltage Power Distribution Systems
Widely used in factory high/low voltage switchgears, workshop power distribution cabinets and production line power circuits for real-time branch current sampling, dynamic load monitoring, precise energy metering and overload fault protection. It enables refined management of factory power distribution, load balance analysis and energy-saving statistics, comprehensively ensuring stable, safe and energy-efficient power supply for industrial production.
6.2 Substation Auxiliary Control Systems
It applies to current sampling and fault protection of low-voltage station service circuits and auxiliary equipment power supply loops in substations. It supplies accurate and continuous current data to substation auxiliary control DCS, power monitoring platforms and intelligent operation & maintenance systems, real-timely monitoring station service load conditions and timely identifying overload, short-circuit, phase loss and other faults. It guarantees stable operation of substation auxiliary equipment and avoids overall station abnormal operation triggered by station service failures.
6.3 Dedicated Matching for GE Power Automation Systems
As an original supporting device within GE Vernova power management product portfolio, it perfectly matches GE PMC series power monitoring modules, full range of Multilin protection relays and GE PMCS energy management platforms. It can build an integrated high-precision power monitoring and protection link, extensively adopted in new construction, capacity expansion and function upgrading projects of complete GE power automation systems.
6.4 Routine Spare Parts for Power Industry
Featuring stable performance and strong versatility, it serves as core standby equipment for industrial enterprises, power operation & maintenance providers and automation engineering companies. It can quickly respond to on-site emergencies including transformer damage, accuracy degradation and maintenance replacement, shorten downtime, and ensure long-term compliant, stable and continuous operation of power distribution systems.
