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Chapter 3 Measurement Principle

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Chapter 3 Measurement Principle

This  instrument  is  designed  to  measure  the  current  (current  waveform)  in
conductors to be measured.
It  consists  of  the  Rogowski  Coil  Sensor  and  the  main  unit  (integrator).
Sections  3.1  and  3.2  in  this  chapter  describe  measurement  principles  and
functions of each part and are concluded with an explanation of a process of
measuring the current (current waveform).

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Summary of Contents for SS-281A

Page 1: ...obe SS 281A H 282A H SS 283A H 284A H SS 285A H 286A H SS 287A H 288A H SS 289A H Instruction Manual Sie haben Fragen oder w nschen eine Beratung Angebotsanfrage unter 49 7121 51 50 50 oder ber info d...

Page 2: ...2015 IWATSU ELECTRIC CO LTD All rights reserved...

Page 3: ...il Current Probe 9 1 2 Features 10 1 3 Usage Example 11 Chapter 2 Names and Functions 12 2 1 Main Unit 12 2 2 Names and Functions of Main Unit 13 2 3 Rogowski Coil Sensor 14 Chapter 3 Measurement Prin...

Page 4: ...Memo...

Page 5: ...observe a warning may result in death or serious injury CAUTION Incorrect operation or failure to observe a caution may result in bodily injury or damage to the instrument Notices Some of the contents...

Page 6: ...heat due to induction heating Even if the absolute maximum di dt is within the range the coil itself is metal so induction heating causes the coil itself to generate heat which may cause smoke fire o...

Page 7: ...ng when handling the Coil Sensor Sensor cable BNC cable or AC adaptor option of this instrument If not an electric shock fire or failure may occur Do not use any of the cables or AC adaptor if damaged...

Page 8: ...power plug of a device or the AC adaptor to which this instrument is connected from the outlet Then detach this instrument from the target to be measured and do not use it Lightning may be a cause of...

Page 9: ...or less at 25 C or less Storage temperature 10 C to 60 C no dew condensation Storage humidity below the moisture amount of 80 RH Do not place this instrument in a location with excessive humidity or d...

Page 10: ...versely placed battery will result in battery explosion or leakage This may cause a fire injury failure or contamination of the surrounding environment Do not throw used batteries in the fire Batterie...

Page 11: ...nt Probe 1 Accessories See the accessories table below Accessories table Option AC adaptor UNIFIVE CO LTD Model No UNI312 0716 I P AC 100 240V 50 60Hz 0 4A Note The AC adaptor option can be purchased...

Page 12: ...ment to IWATSU or our sales distributors When sending an instrument to be repaired clearly write the instrument name serial number in the label on the rear of this instrument description of the failur...

Page 13: ...orce is proportional to a differential value of the current The output electromotive force of the Rogowski Coil is the differential waveform of the current To detect the current waveform the waveform...

Page 14: ...rty around the coil This instrument has the following specifications for details refer to Section 5 1 Specifications Frequency bandwidth fL to 30 MHz 3 dB fL Low Frequency cutoff Peak current 30 A to...

Page 15: ...a sensitivity mV A set for each main unit The converted voltage is output from the output terminal of the main unit Inputting the output voltage to an oscilloscope and other monitoring devices allows...

Page 16: ...Chapter 2 Names and Functions of Parts 12 Chapter 2 Names and Functions 2 1 Main Unit...

Page 17: ...sensor cable refer to Section 2 3 integral with the main unit is connected to this part Section 2 1 Output part BNC output connector Outputs the voltage current waveform of the main unit Section 2 1 C...

Page 18: ...on the measurement environment It does not affect the specifications of the instrument Joint box The sensor cable is secured to one end so that the Rogowski Coil forms a closed loop There is a joint h...

Page 19: ...urrent current waveform in conductors to be measured It consists of the Rogowski Coil Sensor and the main unit integrator Sections 3 1 and 3 2 in this chapter describe measurement principles and funct...

Page 20: ...ield changes with time because alternating current flows in the conductor to be measured In the Rogowski Coil magnetic flux changes along the loop When it changes an electromotive force is generated a...

Page 21: ...ut voltage of the main unit current waveform is observed by an oscilloscope and other monitoring devices through the BNC cable As expressed by the following Equation 3 3 the voltage component Vout obs...

Page 22: ...not place them in the wrong orientation c Close the lid of the battery case For the AC adaptor option a Connect the AC adaptor cable to the connector on the top of the main unit refer to in the appear...

Page 23: ...apply power to the target to be measured before the attachment 3 Place the target to be measured through the Rogowski Coil Sensor a As illustrated in Figure 4 1 release free end of Rogowski Coil from...

Page 24: ...ng the switch to the O side 5 Adjust the ZERO point of the output observed by monitoring devices a Have the included accessory Adjustment Screwdriver ready b As shown in the figure below there is a ho...

Page 25: ...e pressure The required rotation torque is less than 20 mN m If using a screwdriver other than the accessories or applying excessive pressure to ZERO ADJ of the main unit while you don t align the inc...

Page 26: ...onal and a complete ring compound because there is a connecting part in the Rogowski Coil For reference Figure 4 3 shows the position of the connection part of the Rogowski Coil The connection part of...

Page 27: ...erate heat due to induction heating Applicating this is IH s electromagnetic cooker Since the Rogowski coil has a coiled structure in which a copper wire is wound around a core material the coil itsel...

Page 28: ...eneration of corona discharge in an environment where high voltage is applied to the sensor for a long time Depending on the frequency of the applied voltage and installation conditions of the sensor...

Page 29: ...Add an error of 250 ppm C when the temperature is 10 C or less or 70 C or more Output Maximum voltage range 6 V load 100 k Output becomes 2V and sensitivity becomes about the half for 50 load Connect...

Page 30: ...rument is about 18 hours when alkaline batteries are used The LOW BATTERY LED lamp lights up when batteries are consumed About 30 minutes after the illumination this instrument will be automatically s...

Page 31: ...Chapter 5 Specifications 27 5 2 Appearance 1 Main Unit Unit mm...

Page 32: ...Chapter 5 Specifications 28 2 Rogowski Coil Sensor Unit mm...

Page 33: ...rseas Sales Sect Sales Dept No 2 Address 7 41 Kugayama 1 Chome Suginami ku Tokyo 168 8501 Japan Phone 81 3 5370 5483 Facsimile 81 3 5370 5492 URL http www iti iwatsu co jp index_e html E mail info tme...

Page 34: ...SS 281A H 282A H 283A H 284A H 285A H SS 286A H 287A H 288A H 289A H Sie haben Fragen oder w nschen eine Beratung Angebotsanfrage unter 49 7121 51 50 50 oder ber info datatec eu Distributed by...

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