Electrical Measurements in Practice
Electrical Measurements in Practice
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The standard type RO watt-hour meter is the basis of the instrument (Fig. 151) and to this is added a power indicator which consists of a peculiarly shaped auxiUary aluminium vane in the air gap just above the watt-hour meter disc as indicated in Fig.
152 which is a schematic -diagram of the instrument without the register. Movement of this auxiliary vane is opposed by a spiral Fig. 151.
spring, and being subjected to forces similar to those acting on the main disc, it would, if not restricted,... move to a position corresponding to the power in the circuit. The action would be similar to that of an induction-type wattmeter. However, instantaneous movement is prevented by an eccentric claw (see Fig. 152) working with an escapement wheel and so arranged that the auxiliary vane can only move forward at a rate which is fixed by the speed of the main disc.
When current is passed through the windings of the device, 16 Digitized by VjOOQ IC 242 ELECTRICAL MEASUREMENTS IN PRACTICE the escapement wheel is urged forward by the torque of the auxil- iary vane but is allowed to move only tooth by tooth by the claw which in turn is operated by means of a cam geared to the main disc.
What to read after Electrical Measurements in Practice?
You can find similar books in the "Read Also" column, or choose other free books by Farmer, Frank Malcolm, 1877- to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The standard type RO watt-hour meter is the basis of the instrument (Fig. 151) and to this is added a power indicator which consists of a peculiarly shaped auxiUary aluminium vane in the air gap just above the watt-hour meter disc as indicated in Fig.
152 which is a schematic -diagram of the instrument without the register. Movement of this auxiliary vane is opposed by a spiral Fig. 151.
spring, and being subjected to forces similar to those acting on the main disc, it would, if not restricted,... move to a position corresponding to the power in the circuit. The action would be similar to that of an induction-type wattmeter. However, instantaneous movement is prevented by an eccentric claw (see Fig. 152) working with an escapement wheel and so arranged that the auxiliary vane can only move forward at a rate which is fixed by the speed of the main disc.
When current is passed through the windings of the device, 16 Digitized by VjOOQ IC 242 ELECTRICAL MEASUREMENTS IN PRACTICE the escapement wheel is urged forward by the torque of the auxil- iary vane but is allowed to move only tooth by tooth by the claw which in turn is operated by means of a cam geared to the main disc.
What to read after Electrical Measurements in Practice?
You can find similar books in the "Read Also" column, or choose other free books by Farmer, Frank Malcolm, 1877- to read onlineMoreLess
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