SU1625211A1 - Method of determining resistance of mutual induction between rotor windings of synchronous machines - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to improve accuracy. The rotor of the investigated synchronous machine is set to the position of the greatest magnetic coupling about -. field 9 coils with counter-coupled windings 6 and 7 of the stator. The measuring coil 5 is located in the air gap of the synchronous machine. From the generator I, through the switch 2, an alternating voltage is applied to the excitation winding 9. The oscilloscope 4 measures the voltage on the measuring coil 5 and the windings 6 and 7 of the stator and calculates the scale factor. The generator I voltage is applied to the stator winding 6 7, and the current in the stator winding, voltage on the measuring coil 5 and winding 9 is measured by the oscilloscope 4 excitation, as well as angles between the indicated voltages and current and voltage to the excitation winding 9. Calculate the value of the complex resistance of mutual induction between the excitation winding and the damper winding. The measurements are repeated at various frequencies of the voltage of the generator 1 and the frequency response of the mutual resistance of the induction versus the frequency is built, 2 or more. GO SL W

Description

FIELD: electrical. technology and can be used in the experimental determination of electromagnetic parameters of synchronous machines.

The purpose of the invention is to improve the accuracy of determining the resistance of the wind-induction between the excitation winding and the damping winding along the longitudinal axis of the rotor of synchronous machines.

Figure 1 is a diagram of an apparatus for carrying out the method; on

2 is a vector diagram of a synchronous machine. x

The device contains a generator I, a switch 2. shunt 3, an oscilloscope 4, a measuring coil 5. Figure 1 also shows the investigated synchronous machine with the opposite-connected stator windings 6, 7, the damper winding B and the excitation winding 9.

The method is carried out as follows.

&,

The rotor of the synchronous machine is placed in the position of the greatest magnetic coupling of the excitation windings 9 with the windings 6 and 7 of the stator. The measuring coil 5 is located in the air gap with the upper half of the end shields of the synchronous machine removed and then set the switch 2 to the position of supplying the excitation winding 9 with an alternating current frequency S from the generator. Using an oscilloscope 4, the voltage is measured on the measuring coil 5 and on the opposite-connected windings 6 and 7 of the strr and the scale factor is determined in accordance with the expression

m 2 Us

and

LH

(ABOUT

2

If

U

S

Switch 2 is set to the position of supplying the windings 6 and 7 of the stator with alternating current frequency S from generator 1. Measure the voltage on the measuring rod 5 UK and the winding 9 of the excitation Uj using an oscilloscope 4 and determine their values in the system of relative units

by the following expressions

m

Us UK ,, tvg.-jrr-; (2)

where U is the base voltage of the winding

ki stator

U

Ji, "if

7

(3)

where # ± is the base voltage of the field winding. The value of the mutual resistance of the mutual induction between the excitation winding and the damper winding is determined in accordance with the expression

7

 Schm 1; - - -hGk71 s (4)

where Cfi is the angle between the voltage of the measuring coil 5 and

five

0

five

about

five

five

the voltage of the winding 9, the event, measured by the oscilloscope 4}

(is the angle between the voltage of the excitation winding 9 and the stator current measured by an oscilloscope 4} 1 is the current in the stator winding b,

measured by shunt 3; x j - Resistance of mutual induction between the winding of the etator and the excitation winding. The oscillator frequency is changed and the measurements and calculations by expressions (1) ... (4) are repeated. Then the frequency response of the mutual resistance of the excitation winding and the damper winding is plotted as a function of the frequency,

Claims (1)

Using the proposed method will improve the accuracy of heat calculations for rotor windings. Invention Formula Method for determining the mutual induction resistance between the rotor windings of synchronous machines, including the impact on the winding of the test machine by alternating voltage when its rotor is in the position of the greatest magnetic coupling of the excitation winding with two opposite-connected stator windings, measuring informative parameters and determining by measurement results resistance of mutual induction between the field winding and the damper winding, characterized in that, in order to increase the accuracy, the effect of variable voltage The stator winding is applied to the stator winding, and the emf of the air gap, the field winding, the phase between the bottom and the current in the stator winding are selected as informative parameters, and the informative parameters are measured at different alternating voltage frequencies. Octd 1 Ud t ъ + mi No. t-iad) Zy9