Summary:A current transformer is a device that measures the amount of electrical usage in a circuit. Typical...
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current transformer is a device that measures the amount of electrical usage in a circuit. Typical applications for this type of device include measuring high currents or charging customers for electrical use. The primary winding of a current transformer is connected to a line, whereas the secondary winding is attached to a measurement device, such as an ammeter or a relay. This allows for the creation of a standardized, low-current device that can be used to monitor and measure the electrical usage of almost any circuit.
Current transformers are usually classified by their accuracy class. This accuracy class determines how much deviation can be made from the calculated value of the secondary current. It is determined by the factory and is certified to be accurate to a certain percentage of the rating ratio.
There are two basic types of current transformers: wound and bar. The difference between the two is in the construction. For example, a wound current transformer has a primary winding, which is usually a single flat turn. A bar-type current transformer has a secondary winding around the core of the core, which is often a coil of heavy-duty wire wrapped in a central hole.
The polarity of a current transformer is a function of the size of the primary and secondary turns. In general, a current transformer rated at 100/5 has a 100 times higher primary current than a transformer rated at 5/1. The arrows on the polarity markings on an electrical drawing indicate H1, which represents the direction of the current flow. Similarly, a current transformer with a rating of 20/1 has a 20 times higher primary current than a transformer ranked at 10/1.
Ideally, the turn ratio of a current transformer should be as high as possible. If a transformer is overloaded, the core can become saturated and the voltage may be too high for the circuitry to safely handle. Using this method of modification, relatively large changes in the current transformer turns ratio can be achieved.
Three-phase DC Immune Anti-Magnetic Current Transformer
| Product: |
Transformer |
| Material: |
Copper, iron core, heat shrinkable tube |
| Accuracy: |
0.1 level, 0.2 level |
| Process: |
Bare bag, epoxy potting |
| Production: |
Production and processing |
| Voltage Transformation Principle: |
Electromagnetic Type |
| Winding Form: |
Single Layer & Tightly Wound Type |
| Insulating Medium: |
Epoxy Resin |
| Phase: |
Three |
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