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ManualsBrandsSiemens ManualsBuilding automationConnecting a Rogowski Coil Flexible Current Transformer to a Load Installation Instructions
12
Technical Specification Sheet
Document No. 149-405
May 28, 2019
Siemens Industry, Inc.
Page 1 of 2
Rogowski Coil
Flexible Current Transformers
Description
Siemens Rogowski Coil Flexible Current Transformers
(CTs) have been designed for accurate, non-intrusive
measurement of AC current, pulsed DC or distorted
waveforms. These types of sensors may be used to
measure AC current over a wide dynamic range and
from 20 Hz to 5 kHz. They are targeted for use with the
Siemens MD Series Power Meters.
Features
• Available in three sizes:
• 16” Coil (40 cm); creates a 4.5” (11.5 cm) window
• 24” Coil (60 cm); creates a 7.0” (17.9 cm) window
• 36” Coil (90 cm); creates a 10.8” (27.5 cm) window
• Window Sizes;
• 4.5-in. (11.5 cm); 7.0-in. (17.9 cm); 10.8-in. (27.5 cm)
• Multiple signal wire lead length options to match
local application requirements
• Current Range is 5-5000A AC
1
• Accuracy (typical) is <0.6%
2
• Output Signal (di/dt)
131 mVAC/1000A @ 60Hz
109.2 mVAC/1000A @ 50 Hz
1
Depending on meter compatibility. RōCoil CTs are UL Rated to
100KA AC. Siemens MD meters rated for 5-4000A.
2
Installed using best practices with conductor centered in the CT
window and ensure any external conductors are a minimum
distance of > 2X the diameter of the RōCoil. Accuracy below 20A
rated at 1.5% +/- 0.5A when used with Siemens MD series
meters. RōCoil have been 100% verified to meet the C57.13-2008
Class 1.2 Standard.
Table 1. CT Dimensions.
Description
Dimensions in Inches (cm)
R16
A
Window Size
4.5
(11.5)
B
Transformer Coil O.D.
5.5
(13.9)
C
Transformer Length
15.8
(40)
D
Locking Connector
O.D.
0.8
(2.0)
E
Transformer Coil
Diameter
0.5
(1.2)
F
Wire Lead
Total Length
Length A: 118 in. (3 meters)
Length B: 276 in. (7 meters)
Length C: 590 in. (15 meters)

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