Dual Core Toroidal Protection & Measuring Current Transformer
Protection CTs have different characteristics than metering CT. Protection CTs have high saturation point as it has to continuously sense fault current even during fault also. These CTs have low accuracy & are classified as 5P10, 10P10 etc.
- Product Introduction
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Dual core protection & measuring current transformer
Defination:
Metering CT – High accuracy CTs are used for metering as they have low saturation point. CTs are available in following accuracy class – 0.1, 0.2, 0.5,1,3,5. These values indicate percentage error at the rated primary current. It means a CT of 50/5A with 0.1 accuracy will have a max error of 0.1 when 50A current passes through the primary.
Metering CTs are designed in such a way that CT is not damaged by high current during fault. During fault, CT gets saturated & output stays in the range of measuring instruments.
Protection CT – Protection CTs have different characteristics than metering CT. Protection CTs have high saturation point as it has to continuously sense fault current even during fault also. These CTs have low accuracy & are classified as 5P10, 10P10 etc.
Example – CT with class 10P10 – Where first letter 10P indicates the maximum(10%) percentage error & last number 10 indicates the number of times the rated current.
Dual Core CT– Such type of CT has two cores, it means CT has two secondary windings & one primary winding. Dual core CT can be used for two simultaneous applications like metering & relay protection.
1. Dimensions ( unit: mm)
2. Schematic diagram
3. Electrical specifications
PART NUMBER | LO-CT-150D | LO-CT-200D | LO-CT-300D | LO-CT-400D | |||||
TERMINAL MAKRING | 1S1-1S2 | 2S1-2S2 | 1S1-1S2 | 2S1-2S2 | 1S1-1S2 | 2S1-2S2 | 1S1-1S2 | 2S1-2S2 | |
Accuracy Class | 0.5/FS10 | 10P20 | 0.5/FS10 | 10P20 | 0.5/FS10 | 10P20 | 0.5/FS10 | 10P20 | |
Current Ratio | Primary Turns | Rated Capacity (VA) | |||||||
150/5 | 1 | 15VA | 15VA | — | — | — | — | — | — |
200 ̸5 | 1 | — | — | 15VA | 15VA | — | — | — | — |
300 ̸5 | 1 | — | — | — | — | 15VA | 15VA | — | — |
400 ̸5 | 1 | — | — | — | — | — | — | 15VA | 15VA |
4. Technical Requirements
S/N | Description | Electrical specifications |
1 | Hi-pot test P-S | AC3.0KV,1mA,60s No breakdown |
2 | Insulation resistance P-S | 1000MΩMin @DC500V |
3 | Operation temperature | -40 ºC - +125 ºC |
4 | Storage temperature | -40 ºC - +85 ºC |
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