Nanocrystalline cores
Core Balance Current Transformers (CBCT)
Essential for protecting personnel from electric shocks and fire hazards.
Advanced Core Balance Current Transformers for Earth Fault Protection
Ensure maximum safety with our CBCTs designed to detect even the smallest residual currents in three-phase systems.
Zero Sequence Current Transformers for Switchgear Safety
Core Balance Current Transformers (CBCT), also known as Zero Sequence Current Transformers (ZSCT), are critical components for earth fault protection in low and medium voltage electrical systems. These transformers detect unbalanced or residual currents by monitoring the sum of currents in three-phase conductors passed through the transformer’s core. CBCTs operate on the principle that, under normal conditions, the vector sum of phase currents equals zero. If an earth fault occurs, this balance is disturbed, producing a net current that the CBCT detects. This net current induces a voltage in the secondary winding, activating an earth fault relay to isolate the affected part of the circuit.
Characteristics Comparison
Available in a range of inner diameters to accommodate various maximum cross-sectional cable sizes, designed for 3P + N copper cable configurations. Standard I.D.: 25–500 mm (available in multiple standard sizes)
| Properties | Nanocrystalline cores | Ferrite cores |
|---|---|---|
| Saturation Flux density(T) | 1.25 | 0.5 |
| Remanence (T) (20KHz) | <0.3 | 0.2 |
| Core loss (20KHz/0.2T) (W/Kg) | <3.4 | 7.5 |
| Core loss (20KHz/0.5T) (W/Kg) | <30 | can not use |
| Core loss (50KHz/0.3T) (W/Kg) | <40 | can not use |
| Permeability (20KHz) | >20,000 | 2000 |
| Coercivity (A/m) | <2.0 | 6 |
| Saturation magnetostriction(*10^-6) | <2 | 4 |
| Resistivity (μΩ.cm) | 90 | 10^6 |
| Curie temperature(℃) | 560 | <200 |
Specifications
1
System Voltage
Up to 720V
2
Test Voltage
3kV AC for 1 minute
3
System Frequency
50Hz or 60Hz
4
Operational Current Range
25 mA – 30 A
5
Secondary Terminal Protection
IP20
6
Operating Temperature
–10°C to +85°C
7
Mounting
Steel mounting feet for wall or base mounting
Key Features
High sensitivity: detects leakage currents as low as 5 mA
Wide operational current range: 65 A to 400 A
Compact and lightweight for easy installation
Steel mounting feet included
Energy efficient design
Long service life
High accuracy and reliability
Cost-effective protection solution
Flexible design options for standard or retrofit applications
Operating Principle
A fault to ground generates residual current, inducing a proportional current in the secondary winding. This triggers the earth fault relay to trip the circuit and ensure system protection.
Applications
1
Switchgear
2
Distribution systems
3
Control panels
4
Motor protection systems
5
Transformer protection
6
Overload protection
Customizable Parameters
1
Primary rated current
2
Burden
3
Maximum system voltage
4
Frequency
5
Transformer dimensions
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