Current transformer (CT)

£200.00

The Current Transformer (CT) is a precision-engineered instrument used to step down high electrical currents to measurable, standardized levels for accurate monitoring, metering, and protection in power systems. Designed for industrial-grade performance, it ensures reliable current measurement across substations, switchgear, and energy management infrastructures.

Built with high-permeability core materials and superior insulation technology, it delivers exceptional accuracy, stability, and long-term operational safety even under demanding load conditions. Its compact, robust design enables easy integration into both new and retrofit electrical installations.

Competitive advantage lies in its high accuracy class, low phase error, and excellent thermal and short-circuit withstand capability, making it ideal for critical power monitoring and revenue metering applications.

Description

1. Product Overview

The Current Transformer (CT) is a precision instrument transformer designed to step down high primary currents to standardized, safe secondary levels (typically 5A or 1A) for accurate measurement, monitoring, and protection in electrical power systems. Its primary industrial use spans metering, relay protection, energy management, and condition monitoring in medium- and high-voltage networks. The key value proposition is high-accuracy current scaling with galvanic isolation, ensuring personnel safety, metering compliance, and fast fault detection. Strategically, CTs are indispensable for grid modernization, renewable integration, and industrial electrification — making reliable CT sourcing a critical infrastructure decision.

2. Key Specifications & Technical Characteristics

Core material: High-permeability grain-oriented silicon steel or nanocrystalline alloy (for precision); epoxy-resin cast insulation (indoor); oil-filled or SF₆ gas-insulated (outdoor/HV)
Accuracy class: 0.1, 0.2, 0.5 (metering); 5P, 10P, PX (protection) per IEC 61869-2 / IEEE C57.13
Rated current ratio: Customizable (e.g., 100/5A, 400/5A, 2000/1A); ultra-wide range 0.6A–2000A available
Rated burden: 2.5 VA to 30 VA (metering); up to 40 VA (protection)
Physical characteristics:
- Form: Split-core (clamp-on), solid-core, wound-primary, bar-primary
- Output: 5A, 1A, or 333 mV (for electronic metering)
- Operating temperature: –15°C to +50°C (indoor); –25°C to +70°C (outdoor)
- Insulation voltage: 11kV, 20kV, 35kV, up to 220kV BIL
Packaging options: Individual protective boxing, moisture-resistant wrapping, palletized for container shipping; custom crating for HV units
Shelf life: Indefinite when stored in dry, temperature-controlled environment (no chemical degradation)

3. Core Industrial Applications

Industry	Operational Use Case	Performance Advantage
Power Utilities	Revenue metering, SCADA integration, differential protection	Accuracy class 0.2S ensures <±0.2% error at 5–120% load; outperforms low-grade CTs in part-load efficiency
Industrial Manufacturing	Motor protection, energy auditing, harmonic monitoring	High saturation margin prevents false tripping; durable epoxy resin resists vibration & humidity
Renewables (Solar/Wind)	Inverter output monitoring, grid-tie compliance	Wide dynamic range (microscopic to 2000A) captures low-light/output conditions accurately
Data Centers & Commercial Buildings	Submetering, ILR reporting, demand-side management	333 mV output models integrate directly with multifunction meters without shunt losses

4. Competitive Advantages

Quality consistency: Full compliance with IEC 61869-2 & IEEE C57.13; 100% factory calibration with traceable certificates
Supply reliability: Scalable production for standard & custom ratios; lead time 2–4 weeks for OEM orders
Logistics capability: Global shipping via FCL/ LCL; 20MT bulk loading optimized for containerization (see Section 5)
Price competitiveness: Tiered volumetric pricing; 15–25% cost advantage vs. European premium brands without sacrificing accuracy
Sustainability: Halogen-free, RoHS-compliant resin; oil-free dry-type options eliminate leak risk and disposal hazards
Technical support: Dedicated engineering team for short-circuit rating calculations, burden validation, and IEC/IEEE compliance documentation

5. Commercial & Supply Information

Minimum order quantity (MOQ): BULK 20MT
Loading capacity: Up to 24 MT per 40’ HC container (standard indoor CTs); 20 MT per 20’ GP for HV outdoor units
Incoterms: FOB, CIF, DDP available
Payment terms: 30% deposit, 70% against BL copy; LC at sight accepted for orders >$100K

Additional information

Price	per unit

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