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A Current Transformer (CT) is a type of instrument transformer designed to step down high alternating currents (AC) in a power system to lower, measurable values (typically 5A or 1A) for safe monitoring, metering, and protection.
Operates on the principle of electromagnetic induction (like a regular transformer).
Primary Winding: Carries the actual high current (e.g., 100A, 1000A) from the power line.
Secondary Winding: Produces a proportional low current (e.g., 5A or 1A) for instruments.
Turns Ratio (N₂/N₁) determines the scaling factor.
Example: A 1000:5 CT means 1000A primary → 5A secondary.
1. Transformation Ratio (Turns Ratio)
- CTs step down high primary currents to standardized, measurable secondary currents (typically 5A or 1A).
- Example: A 1000:5 CT reduces 1000A primary current to 5A secondary current.
2. Accuracy Class
- Defines precision under specified conditions:
- Measurement CTs (e.g., 0.2, 0.5, 1.0): High accuracy for metering.
- Protection CTs (e.g., 5P, 10P): Focus on reliability during faults.
3. Burden (Load Capacity)
- Maximum load (in VA) the secondary circuit can handle without significant error.
- Must match connected instruments (e.g., meters, relays).
4.Insulation & Safety
- Isolation: Provides galvanic separation between high-voltage primary and low-voltage secondary.
- Short-Circuit Protection: Secondary must never be open-circuited (risk of dangerous high voltage).
- Energy metering
- Over-current/earth fault protection
- Relay coordination in substations
- Power quality monitoring
NEVER Open-Circuit a Live CT Secondary
Danger: An open-circuited CT secondary can generate extremely high voltages (thousands of volts), risking:
Severe electric shock to personnel.
Insulation breakdown in wiring/meters.
CT core damage due to excessive heat.
Safety Measure:
Always short-circuit the secondary terminals before disconnecting a CT.
Use shorting blocks or test switches when working on CT circuits.
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Innovations
1. High Accuracy (Up to 0.2S Class)
Precision Measurement (Up to 0.2S Class)
Exceptional Accuracy (Meeting 0.2S Standards)
Industry-Leading Precision (0.2S Compliance)
Ultra-Precise Sensing (IEC 61869-2 Certified)
2.Innovative Design Features
Tamper-Resistant Construction
User-Friendly Structural Features
Modular Installation Flexibility
3. Wide Current Range (50A – 300A)
Broad Measurement Capability (50A to 300A)
Versatile Current Sensing (Low to High Loads)
Scalable Current Detection (Suitable for Diverse Applications)
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Durable & High-Performance Build
Advanced Core Materials (Silicon Steel/Nanocrystalline)
Flame-Retardant & Safety-Compliant Enclosure
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|
Model |
Ratio(A) |
Burden(VA) |
|
|
Class:0.5S |
Class:0.5 |
||
|
ABO-30T |
50/5 |
2.5 |
2.5 |
|
ABO-30T |
60/5 |
2.5 |
2.5 |
|
ABO-30T |
75/5 |
3.75 |
3.75 |
|
ABO-30T |
80/5 |
3.75 |
3.75 |
|
ABO-30T |
100/5 |
5 |
5 |
|
ABO-30T |
150/5 |
5 |
5 |
|
ABO-30T |
200/5 |
5 |
5 |
|
ABO-30T |
250/5 |
5 |
5 |
|
ABO-30T |
300/5 |
5 |
5 |
Dimension (mm)
https://www.dixsen.com/