SU167244A1 - Device for determining power factors and losses in electrical circuits - Google Patents

Description

The known devices for measuring power coefficients and losses in electrical circuits, for example, bridge circuits called MKM- “a small-sine bridge, are complex and not sufficiently sensitive to small values of power factors and losses. The proposed device is easier known and has a higher sensitivity. It includes the well-known elements of the LKMM measuring bridge — an ohmic divider and voltage, the smaller of which is a decadal resistance shop, a scientific research institute, and a large one without induction and non-capacitive resistance, a constant mutual inductance coil and a multilimit lamp voltmeter. The main distinguishing feature of this device is that the primary winding of the mutual inductance coil is connected in series with the object to be measured, and the lamp voltmeter between the lower voltage divider and the secondary winding of the mutual inductance coil. The drawing depicts the basic electrical circuit of the device and the vector diagram of currents and voltages. lose The smaller divider level is a decade resistance box, and the larger R-2 is small, inductive and capacitive radio resistances. The coil of constant mutual inductance 2 must be selected with the minimum possible angular error. The multilimit lamp voltmeter 5 (or a high-resistance harmonic meter in the case of a non-sinusoidal current) includes the geometric difference between the voltage and the lower stage R-i divider and emf. Mutual inductance coils 2. To determine the power factor and losses, adjust the resistance value R-2 to the minimum indication on the voltmeter 3. Measuring also at a given load current, the voltage Ld, get Рг and о cos с с sin sin -2- where: with - the circular frequency of the current, M is the magnitude of the inductance. Power consumption devices take into account in the usual way. If it is difficult to measure the high voltage Lo, then at - XX 1

Measurement of the total and additional (without I, R) losses, for example, in the windings of the KiaTc ijoB, reactors, electric machines and equipment, the divider of the system is connected to the sensor meter winding, the axis winding.

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A device for determining the coefficients of my loss of electrical losses by measuring the active component of the voltage containing the ohmic div.

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