Novel DC Current Transformer by the Reed Relay’s Release MMF |
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| F. Castelli, M. Faifer |
- Abstract:
- Accurate dc current transformers (DCCTs) are required for high current precision power supplies- Three basic categories of devices are available: devices which uses Ohms law (V=RI) called current shunts, devices which use Amperes law ( ∫ Hdl =ΣI ), called magnetic current sensors, and devices which uses both, called direct current transformers, DCCT’s The novel DCCT (NDCCT) uses Amperes law, and a reed relay (RR) as magnetic current sensor to detect when the primary and secondary ampere-turns would exactly be equal in magnitude and opposite. RR detects the zero flux condition occurring at the outlined balance condition. NDCCT is a clamp-on current probe. Two versions of NDCCT are illustrated, the one as dc current comparator and the other DCCT. By test results on an experimental NDCCT an uncertainty of 1.410-7 on the ratio error at 1 kA of the primary current is achieved.
- Download:
- IMEKO-TC4-2005-003.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC4
- Event name:
- TC4 Workshop 2005
- Title:
10th IMEKO TC4 International Workshop on ADC Modelling and Testing - IWADC (together with XIVth IMEKO TC4 International Symposium on New Technologies in Measurement and Instrumentation)
- Place:
- Gdynia/Jurata, POLAND
- Time:
- 12 September 2005 - 15 September 2005