Description
GE CT12AUF2K0MA
I. Basic Information
Model：CT12AUF2K0MA
Brand：GE General Electric
Product Type：Indoor cast-resin high-voltage current transformer, GE CT12 series industrial integrated CT for measurement and protection. It is designed for medium and high-voltage power distribution systems, with dual functions of high-precision metering and fault protection sampling, widely used in industrial and mining enterprises, substations and factory power systems.
Product Positioning
GE CT12AUF2K0MA is a 12kV indoor epoxy resin cast current transformer with integrated insulation casting structure, oil-free, void-free and maintenance-free. It meets the national and international standards for fiscal metering accuracy and system short-circuit fault protection sampling. It accurately collects normal operating current, overload current and short-circuit fault current of high-voltage loops, and provides standard conversion signals for relay protection devices, measurement and control equipment and SCADA systems. It is the core primary equipment for energy metering, fault protection and condition monitoring of 10kV medium-voltage distribution systems in industrial distribution rooms, municipal substations and industrial self-owned power stations.
Hardware Structure
The whole machine adopts fully enclosed vacuum epoxy resin casting structure, with primary conductor and secondary winding completely solidified and insulated, no internal void or partial discharge hidden danger. The iron core is made of high-permeability cold-rolled silicon steel lamination, featuring low magnetization loss, good linearity and strong anti-saturation capability, which can accurately distinguish normal load current and sudden short-circuit fault current. The secondary winding is wound with high-strength enameled copper wire with uniform turns and stable impedance to ensure long-term sampling accuracy consistency. The shell is made of flame-retardant hard epoxy insulating shell with integrally formed mounting base and high-voltage insulating skirt, featuring high insulation strength, creepage resistance and pollution breakdown resistance. Equipped with standard secondary terminal block and anti-miscontact protective cover, the structure is sturdy and suitable for long-term uninterrupted industrial operation.
Mounting Specification
Standard indoor cabinet busbar fixed mounting, compatible with standard layout of 10kV medium-voltage switchgear, vacuum circuit breaker cabinet and ring main unit. The base is reserved with standard fixing bolt holes for accurate positioning and convenient disassembly and assembly, suitable for new project construction and old cabinet renovation. The product has passed strict power frequency withstand voltage, partial discharge, mechanical strength and temperature cycle aging tests, with shock resistance and deformation resistance, and can withstand long-term cabinet vibration, load temperature rise and ambient temperature and humidity fluctuation.
Compatible Systems
Compatible with all brands of medium-voltage relay protection devices, power measurement and control IEDs, multi-function energy meters, fault recording devices, power SCADA monitoring systems and factory DCS automatic systems. It outputs standard secondary current signals, fully complying with domestic 10kV distribution system secondary equipment sampling specifications, and supporting full-scenario applications such as on-site metering, remote telemetry, fault protection linkage and power quality analysis.
Product Characteristics
1. Integrated metering and protection design, meeting triple requirements of high-precision metering, fault protection and operating condition monitoring;
2. Vacuum epoxy casting insulation with extremely low partial discharge, eliminating hidden dangers of partial discharge, creepage and breakdown;
3. High-permeability iron core with excellent anti-saturation performance and high linearity under short-circuit conditions, ensuring reliable action of protection devices;
4. Low loss and low temperature drift, no accuracy drift under long-term full-load and variable-load operation with stable and credible metering data;
5. Fully enclosed dust-proof and moisture-proof structure, adapting to complex indoor environments, pollution-resistant, moisture-resistant and temperature-change-resistant with maintenance-free operation;
6. Standard electrical parameters and mounting dimensions with strong universality, directly replaceable with domestic and foreign 10kV current transformers of the same specification.
II. Technical Specifications
2.1 Electrical Parameters
Rated System Voltage: 12kV (Applicable to 10kV medium-voltage distribution system)
Power Frequency Withstand Voltage: 42kV/1min (phase-to-ground, phase-to-phase)
Lightning Impulse Withstand Voltage: 75kV
Rated Primary Current: Standard industrial 10kV loop current grade (customizable)
Rated Secondary Current: 5A (universal power system standard)
Accuracy Class: Metering 0.2S/0.5S + Protection 10P, dual compliance with fiscal metering and fault protection standards
Rated Output Capacity: 15VA (standard condition), strong load capacity for parallel sampling of multiple secondary devices
Short-time Thermal Stable Current: Meet 10kV system short-circuit thermal stability requirements, resistant to instantaneous short-circuit current impact
Dynamic Stable Current: Excellent mechanical resistance to short-circuit electrodynamic impact without deformation
Partial Discharge: ≤10pC, exceeding national standards to avoid long-term insulation aging
2.2 Environmental Parameters
Operating Temperature: -25℃～+55℃, stable accuracy in full temperature range without temperature drift distortion
Storage & Transportation Temperature: -40℃～+70℃
Relative Humidity: 5%～95%RH, non-condensing, suitable for closed switchgear humid environment
Operating Environment: Indoor use, no corrosive gas, severe dust or flammable and explosive medium
Seismic Grade: Compliant with power equipment seismic standards, resistant to long-term cabinet vibration
2.3 Structural & Insulation Parameters
Insulation Material: Imported flame-retardant epoxy resin, integral vacuum casting, flame retardant grade V0
Insulation Resistance: ≥1000MΩ (primary-to-ground, primary-to-secondary) under normal conditions
Protection Class: IP40 (cabinet installation), dust-proof and foreign matter intrusion-proof
Structure Type: Indoor dry-type, fully enclosed, maintenance-free integrated structure
III. Core Functions
3.1 High-Precision Energy Metering Sampling
Adopting 0.2S/0.5S high-precision metering winding, it accurately collects steady-state load current of high-voltage loops, suitable for factory energy consumption metering, trade settlement, power statistics and load monitoring. It features excellent full-range linearity and extremely low sampling error under light load, full load and variable load conditions, ensuring compliant, accurate and traceable energy metering data and meeting power department acceptance standards.
3.2 System Fault Protection Signal Collection
Equipped with 10P protection winding with strong anti-saturation capability. In case of system phase-to-phase short circuit, single-phase grounding, overload and other faults, it collects instantaneous large current signals without distortion and transmits them to relay protection devices in real time, supporting accurate fault judgment and rapid tripping isolation to prevent fault expansion, equipment burnout and power outage accidents, ensuring the safety and stability of medium-voltage distribution systems.
3.3 Full-Condition Current Monitoring & Data Feedback
It converts high-voltage primary current into standard secondary 5A signals in real time, providing stable and continuous current data for power measurement and control devices, SCADA and DCS systems, realizing high-voltage loop load monitoring, current over-limit alarm, operating condition analysis and power quality diagnosis, and providing reliable data support for factory power dispatching, load optimization and equipment operation and maintenance.
3.4 High-Strength Insulation Protection & Safety Isolation
The integral epoxy casting insulation structure realizes complete electrical isolation between high-voltage primary loop, low-voltage secondary loop and cabinet ground potential, eliminating the risk of high voltage penetrating into secondary loop and protecting the safety of secondary instruments, protection devices and maintenance personnel. The ultra-low partial discharge design avoids long-term insulation aging and partial discharge breakdown, greatly extending service life and reducing high-voltage cabinet tripping probability.
IV. Working Principle
GE CT12AUF2K0MA current transformer operates based on the electromagnetic induction principle, realizing accurate proportional conversion from high-voltage primary current to low-voltage secondary current through iron core magnetic coupling. The equipment is connected in series to the 10kV high-voltage busbar loop. When load current or fault current flows through the primary busbar, alternating magnetic flux is generated in the iron core.
The alternating magnetic flux cuts the secondary winding to induce standard proportional secondary current signals. The metering winding is optimized for steady-state power frequency current to ensure daily power metering accuracy; the protection winding optimizes iron core anti-saturation characteristics to maintain linear output without waveform or amplitude distortion under short-circuit transient large current conditions.
The standard secondary current signal is transmitted to energy meters, protection devices and measurement and control equipment to complete energy metering, fault judgment and condition monitoring respectively. The equipment maintains complete electrical isolation between primary and secondary sides throughout operation, realizing long-term stable and high-precision signal conversion with high insulation and low loss structure, ensuring compliant metering and reliable protection of distribution systems.
V. Application Scenarios
1. Industrial 10kV high-voltage distribution rooms: Metering and protection sampling for high-voltage incoming, outgoing and section loops;
2. Commercial and industrial self-owned power stations: Current monitoring, power settlement and fault protection for 10kV generator outgoing loops;
3. Municipal public substations: Integrated metering and protection sampling equipment for 10kV distribution switchgears;
4. New energy booster stations: Current collection and protection coordination for 10kV grid-connected loops of distributed photovoltaic and wind power;
5. Old power distribution project renovation: Replace old oil-immersed and dry-type transformers to improve system insulation, metering and protection accuracy;
6. High-energy industrial and mining enterprises such as metallurgy, chemical industry and manufacturing, adapting to impact load and long-term full-load operating conditions.
