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TELONIC HAS RECENTLY BECOME DANFYSIK PRECISION CURRENT TRANSDUCERS U.K SALES AGENT |
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13/11/2008 |
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| The ULTRASTAB current transducers is delivered in a program covering a galvanic isolated measurements of currents from DC to 500 kHz ranging from 40 A to 25 kA. The precision current transducers are using a zero flux detector principle controlling a compensation current which counterbalance the ampere turns generated of the primary current. Due to a balanced zero flux detector principle the output noise level is by nature very low and a resolution in the order of 0.02ppm is achieved. Figure 1 shows a block diagram of the zero flux detector transducer principle.  The transducer head core (1) is the basic body structure. The cores (2) and (3) are zero flux detector cores coupled to the electronics zero flux detector circuitry by means of the coils L1 and L2. L1 and L2 are coupled in parallel or serial, depending of model, with opposite phase to reduce the unwanted flux generated in Core1. With a primary current Ip flowing through L4 a magnetic flux will be generated in the body structure and detected by the detector cores. An error signal will be generated, controlling the amplifier A1 to drive a current through the compensation winding L3. When counterbalance is obtained, i.e. zero flux is reestablished, the compensation current, multiplied with the number of turns in L3, is a true expression of the primary current Ip. The zero flux detector circuitry operates from true DC to about 1Hz. For higher frequencies the “AC pick up winding” L5 performs a feedback error signal which via the amplifier A3 widens the active bandwidth of the transducer up to more than 10 kHz. Above 10 KHz the DCCT operates as a passive current transformer with its -3dB limit varying from 10 KHz to 1 MHz depending on size and construction of the DCCT. |
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For further information pertaining to this News Topic: Bob Lovell Telonic Instruments Ltd. Toutley Industrial Estate Toutley Road Wokingham Berkshire RG41 1QN Tel: +44 (0118) 978 6911 Fax: +44 (0118) 979 2338 |
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TELONIC INSTRUMENTS LIMITED.
Toutley Industrial Estate, Toutley Road, Wokingham, Berks, RG41 1QN.
U.K.
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