HEYI extend range current transformer RECT-78A type

  • Standards: IEEE C57.13
  • Secondary side equipped with a short-circuiting device
  • Sealable
  • Application: Indoors, or in an outdoor enclosure
  • Rated Voltage: Up to 0.72 kV
  • Frequency: 50 or 60 Hz
  • 0.3 Metering Class

Resin insulated current transformer RECT Series are designed as Extended-Range current transformers, catering to billing purposes and applicable to power systems up to 600V. This series delivers a minimum Class 0.3 Accuracy for billing measurements and can be installed indoors or in outdoor enclosures. With current ratios ranging from 100:5A to 800:5A and window diameter options including 38mm, 66mm, and 78mm, RECT Series stands out with its versatility.

Features:

  • High Accuracy and Linearity: RECT Series resin insulated current transformer maintains a minimum 0.3 accuracy level and high linearity within its designed range, ensuring reliable current measurements under various operating conditions.
  • Wide Range Measurement: RECT resin insulated current transformer Specifications allow the product to maintain rated accuracy and burden rating while measuring from 1% to 150% of the rated current, surpassing typical metering-class requirements (5% to 100%).
  • Sealed Design: All RECT Series resin insulated current transformer feature a sealed design, effectively isolating transformer oil from external air to prevent oil aging and enhance operational reliability.
  • Compliance with Electrical Standards: The product adheres to IEEE C57.13 standards and has undergone type testing by a laboratory accredited by an ILAC member.

Applications:

  • Power System Protection: Widely used in power system protective relays, RECT Series accurately measures currents during normal operation and fault conditions, providing essential information for protective devices.
  • Energy Metering: Ideal for billing purposes in energy metering systems, RECT Series offers precise measurements across a wide current range.
  • Industrial Applications: Suitable for industrial environments, especially in processes with significant current fluctuations, RECT Series provides accurate current measurements and protection functionality.
Model Current Ratio RF Accuracy & Burden (IEEE) Window Diameter Approx. Weight
At 30℃ Ambient Temperature At 55℃ Ambient Temperature
RECT-38A 100 / 5A 4 4 0.3 B-0.2 38 mm 6.5 kg
RECT-66A 150 / 5A 4 4 0.3 B-0.1 66 mm 5.0 kg
200 / 5A 4 4 0.3 B-0.5
250 / 5A 4 4 0.3 B-0.5
RECT-78A 300 / 5A 4 2.9 0.3 B-0.5 78 mm 4.0 kg
400 / 5A 4 2.9 0.3 B-0.5
500 / 5A 3 2.4 0.3 B-0.5
600 / 5A 2 1.8 0.3 B-0.5
800 / 5A 2 1.5 0.3 B-0.5
Model Current Accuracy & Window Approx.
Ratio RF Burden (IEEE) Diameter Weight
ROS-66A 150 / 5A 1% ~ 150% 0.3 B-0.1 66 mm 5.0 kg
200 / 5A 1% ~ 150% 0.3 B-0.5
250 / 5A 1% ~ 150% 0.3 B-0.5
ROS-78A 300 / 5A 1% ~ 150% 0.3 B-0.5 78 mm 4.0 kg
400 / 5A 1% ~ 150% 0.3 B-0.5
500 / 5A 1% ~ 150% 0.3 B-0.5
600 / 5A 1% ~ 150% 0.3 B-0.5
800 / 5A 1% ~ 150% 0.3 B-0.5

Diagram

FAQ

1. How do I select the correct current ratio for the RECT-78A current transformer?

The RECT-78A offers current ratios from 300/5 A to 800/5 A with a rated 5 A secondary output. Select the ratio according to your normal operating current, maximum continuous current, ambient temperature and meter requirements. Check the rating factor for the selected ratio and ensure the 78 mm window accommodates your conductor.

2. Is the RECT-78A suitable for revenue metering?

The RECT-78A is designed for billing and energy metering, with IEEE Class 0.3 accuracy at the specified burden. For applications with low or fluctuating loads, confirm the guaranteed accuracy range for your selected configuration. Utility acceptance should be checked against the applicable project requirements and supporting test documentation.

3. What does the rating factor (RF) mean?

The rating factor indicates the continuous primary current capability relative to the rated primary current under specified conditions. For example, RF 2 on a 600/5 A CT corresponds to 1,200 A continuous primary current at the stated ambient temperature. RF varies by ratio and temperature; the guaranteed metering accuracy range must also be checked separately.

4. What does 0.3 B-0.5 mean, and how do I match the CT to my meter?

The designation combines IEEE Class 0.3 metering accuracy with the specified B-0.5 standard burden. When selecting the CT, consider both the meter burden and the impedance of the secondary wiring. Provide your meter specifications, cable length and cable cross-section so the complete secondary circuit can be checked against the CT rating.

5. Can the RECT-78A current transformer be installed outdoors?

The RECT-78A is intended for indoor installation or installation inside an outdoor enclosure. For outdoor projects, confirm that the enclosure and installation conditions provide suitable protection against rain, condensation and environmental exposure. Check the ambient temperature and the corresponding rating factor before selecting the current ratio.

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