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MV Flexible Rogowski coils

Inquiry

Taehwatrans Medium Voltage (MV) Flexible Rogowski coils are designed to meet the requirements of medium voltage grids. Their voltage insulation level covers max 24KV nominal rated voltage, which equals to 50KV rated power frequency withstand voltage per minute. Taehwatrans TFR series provide best-in-class accuracy for metering and monitoring purpose. They are designed in a way that that their output is hardly influenced by the position of the conductor within the loop and that cross talk, interference from external magnetic fields caused by from nearby conductors, is very low. They show accuracy class 0.5 compliant to IEC61869-10 and less than ±0.5%(max 1%) positioning error around 360 degree of coil loop. They are IP67 protection rating and UV protective so that they show excellent performance in outdoor applications.

They have wide dynamic range where the same coil can be used to measure currents from mA to hundreds of kA. Also they have excellent linearity less than 0.5%. By sophisticated engineering of coil winding and design process, the frequency bandwidth for -3dB ranges from hundreds of kHz and to Mhz. The coreless structure enables Rogowski coils to be used in limited space. Compared with the traditional current transformers, they do not require the power consumption along with an extremely light weight. In the safety aspect, the safe secondary circuit block is not necessary to prevent the damage from the high instantaneous surge current due to an air core usage. In regards to applications, they have the AC accurate measurement, what is more, including the measurement of AC components, ripple current, and DC components.

They are available in different sizes and can be engineered according to customers’ requests, therefore they can be used in all those applications where traditional transducers are not fitting due to its size and/ or weight. TFR series are designed to have strong tolerance against the influence of external magnetic fields, therefore it is capable of an excellent measurement from low currents to hundreds of kA. The Rogowski coils must be connected to an electronic integrator for 90° phase shift compensation and frequency equalization. Integrators sold separately.

MV Flexible Rogowski coils Features Image

Application

- Revenue-Grade distribution transformer monitoring
- Energy sub-meters
- Pole-top transformer monitoring
- Power quality monitoring
- Condition monitoring
- Distributed measurement systems


Features

- Voltage insulation: max 24KV nominal rated voltage (50KV rated power frequency withstand voltage per minute)
- Accuracy class 0.5 by IEC61869-10
- Protection Degree IP67 & UV Protective
- Very low positioning errors & excellent orthogonality
- Easy & quick installation in uninterruptible power line
- Adaptable for a large range of coil diameter

Drawing

rogowski flexible coil_drawing

Electrical Property & Dimension

Specification

Specification Spec
Model TFR180LM TFR240LM TFR300LM TFR400LM TFR620LM TFR960LM
Rope Length 180.0mm
7.09"
240.0mm
9.45"
300.0mm
11.81"
400.0mm
15.75"
620mm
24.41"
960mm
37.80"
Window Size 50mm
1.97"
70mm
2.76"
84mm
3.31"
127mm
5.00"
190mm
7.48"
300mm
11.81"
Cable Length 2000mm / 79"

Electrical Property

Electrical Property
Accuracy Class
(IEC61869-10)
Class 0.5
(Reading Accuracy)
Max Short
Circuit Current
40kA @RL 1MΩ
Nominal Measurement Current 5A - 6000A Operating Voltage a.c. max 24kV
Output Voltage @1000A "70mV ± 5%(60Hz) 58mV ± 5%(50Hz)" Hi-Potential Voltage(per min.) a.c. max 50kV
Phase Displacement 0.05° (Degree) IP Rating & UV Resistance IP67 & UV Resistive
Positioning Error (0° ~ 360°) Avr.± 0.5%(max 1%) Ambient Operating Temp. 40°C ~ +70°C
Mutual Inductance 186nH / 60Hz Storage Temperature -40°C ~ +80°C
Max External Stray
Mutual Inductance Error @0.5mT
≤0.1%(1000A)≤1.0%(100A) Cable AWG18, MV Insulated

* Custom output and rope length are available per requests

· Orthogonal Error

· Positioning Error