| 摘要 |
PCT No. PCT/SE92/00104 Sec. 371 Date Jul. 20, 1993 Sec. 102(e) Date Jul. 20, 1993 PCT Filed Feb. 21, 1992 PCT Pub. No. WO92/14999 PCT Pub. Date Sep. 3, 1992.For temperature measurement at a number of measuring points on, for example, current-carrying bars (2) in a high-voltage switchgear, a data transmitter (1) is used which is arranged near each measuring point and at the same potential as such point. The transmitter is controlled by a temperature sensor (8) and comprises components (3, 4) for capturing drive energy from the electric or the magnetic field around the bar. The temperature sensor (8) may consist of a quartz crystal, the resonance frequency of which has a specified temperature dependence. Measured data is transmitted by means of light (e.g. infrared) in the air to a data receiver (10) at ground potential. The data receiver (10) is able to receive measured data from a plurality of data transmitters.
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