HEYI Factory SDH Type Current Transformer
SDH series current transformers can be used to test, control, display and record the operation of electrical equipment and protect equipment from damage.
Introduce
In the AC circuit with rated voltage lower than 720V and frequency of 50-60Hz, this product can also be used for matching mine transformers.
Applications
Current measurement, monitoring and piotection for electrical wiring and equipment.
Current and power measurement for electric motors, lighting,air compressor, heating and ventilation system.
Air-condition equipment and Current, power and energy monitoring device.
Relay protection device.
Features
The structure of the self-locking, safe, easy to install, portable.
Wide inner window, allowing clamping of big cables or bus-bars.
Wide range of sizes to accommodate all the existing installations.
Technical Parameter
| Electrical Parameter | Mechanical Parameter | ||
| Frequency | 50/60Hz | Case | PC/UL94-V0 |
| Rated Input | 1A-5000A | Bobbin | PBT |
| Measuring range | 5%In-120%In | Core | Silicon steel |
| Rated Output | 1A , 5A | Internal structure | Screw |
| Rated Voltage | 0.72KV(AC) | Construction | －25℃～＋75℃ |
| Dielectric strength | 3.0KV/1mA/1min | Operating Humidity | ≤85% |
| Insulation Resistance | DC500V/100MΩ min | Output Connection | Terminal |
Specification
| Type | Ratio(A) | Burden(VA) | Frequency(Hz) | |
| class:0.5 | class:1.0 | |||
| SDH-40 | 150/5A | 2.5 | 5 | 50/60 |
| 200/5A | 5 | 5 | 50/60 | |
| 250/5A | 5 | 5 | 50/60 | |
| 300/5A | 5 | 5 | 50/60 | |
| 400/5A | 5 | 5 | 50/60 | |
| 500/5A | 10 | 10 | 50/60 | |
| 600/5A | 10 | 10 | 50/60 | |
| Type | Ratio(A) | Burden(VA) | Frequency(Hz) | |
| class:0.5 | class:1.0 | |||
| SDH-50 | 200/5A | 5 | 5 | 50/60 |
| 250/5A | 5 | 5 | 50/60 | |
| 300/5A | 5 | 5 | 50/60 | |
| 400/5A | 5 | 5 | 50/60 | |
| 500/5A | 5 | 5 | 50/60 | |
| 600/5A | 10 | 10 | 50/60 | |
| 750/5A | 10 | 10 | 50/60 | |
| 800/5A | 10 | 10 | 50/60 | |
| Type | Ratio(A) | Burden(VA) | Frequency(Hz) | |
| class:0.5 | class:1.0 | |||
| SDH-60 | 300/5A | 5 | 5 | 50/60 |
| 400/5A | 5 | 5 | 50/60 | |
| 500/5A | 5 | 5 | 50/60 | |
| 600/5A | 5 | 5 | 50/60 | |
| 750/5A | 5 | 5 | 50/60 | |
| 800/5A | 10 | 10 | 50/60 | |
| 1000/5A | 10 | 10 | 50/60 | |
| 1200/5A | 10 | 10 | 50/60 | |
| Type | Ratio(A) | Burden(VA) | Frequency(Hz) | |
| class:0.5 | class:1.0 | |||
| SDH-80 | 750/5A | 5 | 5 | 50/60 |
| 800/5A | 5 | 5 | 50/60 | |
| 1000/5A | 10 | 10 | 50/60 | |
| 1200/5A | 10 | 10 | 50/60 | |
| 1500/5A | 10 | 10 | 50/60 | |
| 1600/5A | 10 | 10 | 50/60 | |
| 2000/5A | 15 | 15 | 50/60 | |
| Type | Ratio(A) | Burden(VA) | Frequency(Hz) | |
| class:0.5 | class:1.0 | |||
| SDH-100 | 1000/5A | 10 | 10 | 50/60 |
| 1200/5A | 20 | 10 | 50/60 | |
| 1500/5A | 20 | 10 | 50/60 | |
| 2000/5A | 20 | 10 | 50/60 | |
| 2500/5A | 30 | 30 | 50/60 | |
| 3000/5A | 30 | 30 | 50/60 | |
| Type | Ratio(A) | Burden(VA) | Frequency(Hz) | |
| class:0.5 | class:1.0 | |||
| SDH-120 | 1500/5A | 20 | 30 | 50/60 |
| 1600/5A | 20 | 30 | 50/60 | |
| 2000/5A | 20 | 30 | 50/60 | |
| 2500/5A | 20 | 30 | 50/60 | |
| 3000/5A | 20 | 30 | 50/60 | |
| 4000/5A | 20 | 30 | 50/60 | |
FAQ
1. How do I choose the correct SDH current transformer ratio?
Choose the CT ratio according to the maximum current of your electrical system. For example, if the normal operating current is close to 400A, a 400/5A current transformer may be suitable. It is generally recommended to avoid selecting a ratio that is much higher than the actual operating current, as this may affect measurement accuracy.
2. Which SDH current transformer size is suitable for my busbar or cable?
The correct model depends on the size of the cable or busbar passing through the CT window. Before selection, please provide the cable diameter or busbar width and thickness. HEYI can recommend a suitable SDH model based on both the conductor size and required current ratio.
3. Can the SDH current transformer be used with energy meters and power meters?
Yes. The SDH current transformer can be used in electrical panels, switchboards, energy monitoring systems and other power measurement applications. When selecting the CT, make sure the secondary output, accuracy class and burden are compatible with the connected meter or measuring device.
4. Should I choose a 1A or 5A secondary output current transformer?
Both 1A and 5A secondary outputs are commonly used. A 5A output is widely used in conventional metering systems, while a 1A output can be more suitable for installations with longer secondary wiring because it helps reduce cable power loss. The final choice should match the input requirement of the connected meter or relay.
5. What information should I provide when requesting an SDH current transformer?
To recommend the correct model, please provide the primary current ratio, secondary output, accuracy class, required burden, cable or busbar size, system frequency and application. For OEM projects, you can also provide your drawing, installation dimensions or other technical requirements.
