G - Physics
01
K
340/159, 318/50,
G01K 7/04 (2006.01) G01K 1/02 (2006.01) G01K 7/20 (2006.01)
Patent
CA 1087277
ABSTRACT OF THE DISCLOSURE A telemetry system for a dynamoelectric machine to detect temperature at a location on said rotor and to provide a signal externally giving an accurate indication of the temperature. A resistance temperature sensor (or resistance temperature detector) is connected to a constant current source and the voltage drop across it varies with changes in temperature. This voltage change is amplified and a voltage-to-frequency converter then provides a signal where frequency varies with the changes in temperature at the sensor. This signal is applied to slip rings on the rotor and brushes mounted on the stator conduct the signal to a frequency- to-voltage converter. A voltage-to-current converter then converts the signal to a current signal whose amplitude varies with changes in temperature at the sensor. This current signal is used for alarms or displays or controls. To provide power to the resistance temperature sensor and associated equipment i.e. the constant current source, the amplifier, and the voltage- to-frequency converter on the rotor, an external DC supply is connected to the brushes and this is available on the slip rings. A filter and a DC to DC converter are connected to the slip rings and provide the necessary power to the sensor, amplifier and converter on the rotor. The rings and brushes provide a reliable direct connection between the equipment on the rotor and the external equipment, and the power for the rotor equipment and the temperature responsive signals are superimposed on the slip rings.
258174
Canadian General Electric Company Limited
Eckersley Raymond A.
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