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DP Series Current Transformer - Reliable China Suppliers & Factory for Power Management Solutions
Product Overview
A CT employs electromagnetic induction and is made up of two windings: a secondary winding with many turns linked to safety or measurement devices, and a main winding with a few turns connected in series to a high-current circuit. The secondary winding, which is commonly set to 5A or 1A for the bulk of industrial applications, receives very little current, whereas the primary winding receives a lot. This proportionality, also known as the transformation ratio, safeguards individuals and equipment from potentially hazardous voltages while allowing for accurate current monitoring.
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High Precision Energy Metering
CTs require high precision for energy metering and linearity to decrease measurement error.
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High Voltage Insulation
Sufficient insulation is required to support high voltage between primary and secondary windings.
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Accurate Current Monitoring
Enables more precise current monitoring and improved issue diagnostics for modern electrical systems.
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Important Safety Warning: The secondary winding should never be left open circuit while utilizing a CT. An open circuit may generate extremely high voltages, potentially damaging electrical equipment.
Current transformers are critical to ensuring the reliability, efficacy, and safety of modern electrical systems, since they enable more precise current monitoring and improved issue diagnostics.
Technical Parameters
| Type | Specification | (mm) Outline Size | ||||
|---|---|---|---|---|---|---|
| A | B | C | D | E | ||
| DP-23 | 100–400A / 5A | 112 | 90.5 | 59.5 | 32 | 22 |
| DP-46 | 250–1000A / 5A | 141 | 114 | 55 | 62 | 42 |
| DP-58 | 250–1500A / 5A | 163.5 | 123 | 59.5 | 82 | 51.5 |
| DP-88 | 250–1500A / 5A | 162 | 144 | 55.5 | 82 | 82 |
| DP-510 | 500–3000A / 5A | 191 | 142 | 67 | 102 | 52 |
| DP-812 | 500–3000A / 5A | 203 | 151 | 59.5 | 122 | 82 |
| DP-614 | 1000–5000A / 5A | 230 | 162.5 | 70.5 | 142 | 63 |
| DP-816 | 1000–6000A / 5A | 250 | 183 | 71.5 | 162 | 82 |
| DP-820 | 3000–10000A / 5A | 303 | 183 | 71.5 | 205 | 82 |
| Accuracy Grade: 1.0 | Overload Current: ≥ 1.2% In | |||||
Frequently Asked Questions (FAQ)
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What is a Current Transformer (CT) and how does it work?
A Current Transformer (CT) works on the principle of electromagnetic induction. It consists of two windings — a primary winding connected in series with a high-current circuit and a secondary winding linked to measurement or protection devices. The secondary winding outputs a proportionally reduced current (typically 5A or 1A), allowing safe and accurate monitoring of high currents.
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Why should the secondary winding of a CT never be left open circuit?
Leaving the secondary winding open circuit is extremely dangerous. Without a connected load, the CT can generate extremely high voltages across the secondary terminals, which may damage the transformer insulation, connected equipment, and pose a serious safety risk to personnel. Always ensure the secondary circuit is closed or short-circuited before disconnecting any measuring instruments.
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What accuracy grade do these current transformers support?
The current transformers in this series are rated at Accuracy Grade 1.0, which is suitable for energy metering and industrial measurement applications. This grade ensures minimal measurement error and reliable linearity across the specified current range.
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What current ranges are available in the DP series CT models?
The DP series covers a wide range of primary current ratings to suit various industrial applications. Available ranges include 100–400A, 250–1000A, 250–1500A, 500–3000A, 1000–5000A, 1000–6000A, and up to 3000–10000A, all with a standard secondary output of 5A.
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What is the overload current specification for these CTs?
The overload current for this CT series is specified at ≥ 1.2% of the rated current (In). This ensures the transformer can handle temporary overload conditions without compromising measurement accuracy or causing damage to the unit.
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How do I select the right CT model for my application?
Selecting the correct CT model depends on the primary current range of your circuit, the physical space available for installation (refer to the outline dimensions A–E in the technical parameters table), and the required accuracy grade. For example, if your system operates at up to 1500A, the DP-58 or DP-88 models would be appropriate. Always ensure the secondary rated current (5A) matches your connected measuring instruments.