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Summary of Contents for Phoenix Mecano Zero-flux TOPACC-HC
- Page 1 User Manual TOPACC-HC User Manual TOPACC-HC Zero-flux™ Current Measuring System PM Special Measuring Systems B.V. Phone : +31 537 400 740 Euregioweg 330B E-Mail : info@pm-sms.com 7532SN Enschede Internet : www.pm-sms.com The Netherlands ZF 02.095EN rev.D Page 1 of 19...
- Page 2 User Manual TOPACC-HC Please stick rating plate here. Document number : ZF 02.095EN Revision / Date : D / December 2010 PM Special Measuring Systems B.V. operates a policy of continuous development and improvement. PM Special Measuring Systems B.V. reserves the right to change the contents of this manual without prior notice.
- Page 3 User Manual TOPACC-HC INTRODUCTION ______________________________________ Fout! Bladwijzer niet gedefinieerd. The basic principle ________________________________ Fout! Bladwijzer niet gedefinieerd. The burden resistor ________________________________ Fout! Bladwijzer niet gedefinieerd. The precision amplifier _____________________________ Fout! Bladwijzer niet gedefinieerd. TECHNICAL SPECIFICATIONS ____________________________ Fout! Bladwijzer niet gedefinieerd. AVAILABLE STACC-HC SYSTEMS __________________________ Fout! Bladwijzer niet gedefinieerd.
- Page 4 User Manual TOPACC-HC d. Peak detector ________________________________________________ Fout! Bladwijzer niet gedefinieerd. e. Excitation control _____________________________________________ Fout! Bladwijzer niet gedefinieerd. f. AC-Loop ____________________________________________________ Fout! Bladwijzer niet gedefinieerd. Accuracy check ___________________________________ Fout! Bladwijzer niet gedefinieerd. 7.4.1 With standard resistor ______________________________ Fout! Bladwijzer niet gedefinieerd. 7.4.2 With reference DCCT _______________________________ Fout! Bladwijzer niet gedefinieerd.
- Page 5 User Manual TOPACC-HC INTRODUCTION The bipolar Zero-flux current transformer System TOPACC-HC, developed by PM SMS for scientific research, epitomise the concept of a galvanic ally separated system for measurement direct alternating high currents up to 30 kA with exceptionally high accuracy and stability.
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Page 6: Technical Specifications
User Manual TOPACC-HC TECHNICAL SPECIFICATIONS PRIMARY CIRCUIT Rated current up to 30 kA Permissible overcurrent 1.1 I rated Short-circuit current 10 I (0.1s) rated Current slew rate unlimited OUTPUT CIRCUIT Rated voltage 10 V Maximum load current 5 mA Output impedance <... - Page 7 User Manual TOPACC-HC AVAILABLE TOPACC-HC SYSTEMS A standard bipolar TOPACC-HC Zero-flux current measuring system consists of: Electronics Module (EM) Measuring Head (MH) Interconnection cable (standard length 3 m). Types Type Maximal current Performance Model measuring head THC10 6 . . . 10 kA Bipolar 332-5 THC20...
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Page 8: Installation
User Manual TOPACC-HC INSTALLATION Both electronics module as measuring head have a unique rating plate for easy identification. As electronics module and measuring head together form a measuring system the serial numbers on both components are the same but have an additional code. This is the letter code EM for the electronics module, and the letter code MH for the measuring head. - Page 9 User Manual TOPACC-HC Electrical connections Electronics Module see drawing: External Connections of Electronics Module Measuring Head and connection cable see drawing: Wiring diagram of Measuring Head and cable 4.2.1 Electronics Module a. Mains supply connector X1 The standard supply voltage is 400V - 3 phase – 50…60Hz. Other voltages on demand. For connecting the electronics module to the mains supply a 7-pole Burndy connector is supplied.
- Page 10 User Manual TOPACC-HC 2. Also a 3-wire connection is possible. It has the advantage that gain (ratio error) is not influenced by cable resistance and various lengths. It can be used if the input at the user-side is high impedant. High and H can be shorted at the cable sense part of X4.
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Page 11: Potential Free Contacts
User Manual TOPACC-HC INDICATIONS The System TOPACC-HC is equipped with several LED indicators for quick survey. They are located in the frontpanel of the electronics module. All LED's indicate a "true" situation. Also indications are available on potential free contacts for remote monitoring. Power on LED This LED indicates the presence of the DC voltage on the printed circuit boards. - Page 12 User Manual TOPACC-HC COMPOSITION OF THE TOPACC-HC Prim. Wind. Sec. Wind. Measuring Head Power Amplifier Oscillator Peak detector AC-Loop Balance Excitation Loop finder Control Zero Output Current valid detector Power Supply Mains Controlloop Precision Amplifier -10 x Burden Offset Ratio at front Fig.5 Block diagram of the Zero-flux...
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Page 13: Electronics Module
User Manual TOPACC-HC The Measuring Head Standard The number of secondary turns, series connected, normally results into a nominal compensation current of 5A. The temperature rise of the secondary winding will be 50K maximum, after 24 hours of nominal current. The thermal time constant is approx. 4 hours. With calibration windings The head with calibration winding consists of two identical 5A windings with a total number of ampere- turns equal to that of the secondary winding. - Page 14 User Manual TOPACC-HC module and contains several auxiliary circuits such as speed regulators for the fans, drivers for the power stages and terminals interconnecting the controlloop. The +/- 40V line for the controlloop is protected with thermistors for overload protection. Furthermore there are some optional auxiliary circuits in case an unipolar DCCT or a bipolar (2-stage) extremely high current DCCT with a H-bridge power amplifier is requested.
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Page 15: Maintenance
User Manual TOPACC-HC MAINTENANCE Periodical maintenance The TOPACC-HC needs no specific periodical maintenance. Re-calibration is suggested every 5 years. The accumulation of dust, dirt or moisture can however affect the correct operation of the TOPACC-HC. Depending on the operating conditions this should be checked once a year. Cleaning should be done with low pressure, clean dry air or with a soft brush. - Page 16 User Manual TOPACC-HC 7.3.4 Controlloop The following tests can only be performed with the use of an extender board, in order to have all connector pins available for measuring purposes. (F-type connector with the rows d, b and z). * Measure always with respect to common (d4, b4, z4). * Oscilloscope input: DC.
- Page 17 User Manual TOPACC-HC d. Peak detector The output signal of the "peak detector" is shown in the figure below. The output signal is measured in closed-loop situation. The wave-shape depends a lot of the adjustment made for induced voltage with potentiometer P3, but will be synchronous with the magnetizing current.
- Page 18 User Manual TOPACC-HC Accuracy check Due to the very good long-term stability of the TOPACC-HC it is not really necessary to check the accuracy periodically. Under normal operating conditions the ratio drift and offset drift versus temperature and time will stay within the original specifications. Nevertheless, if an accuracy check is required, the following circuits could be used.
- Page 19 User Manual TOPACC-HC Calibration If calibration of the DCCT is desired, one of the test circuits suggested in the accuracy check description can be employed. Note: Do not use an extension board for the precision amplifier because this strongly can influence the calibration.
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