JPS5989599A - Terminal voltage detecting system for synchronous machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention obtains the terminal voltage of the stator winding of a synchronous machine having a brushless exciter from an auxiliary winding provided close to the stator winding, which is different from the conventional one. This invention relates to a terminal voltage detection system for a synchronous machine that does not require a voltage detection transformer and reduces costs.

As a system for detecting the terminal voltage of the stator winding of a synchronous machine having a brushless exciter, one shown in an electric circuit diagram as shown in FIG. 1 is known. To explain this, 1 is a synchronous generator, and 2 is its field winding. The field winding 2 is connected via a diode 3 to an armature winding 4 of an AC exciter. A field winding 5 is provided with respect to the armature winding 4. Field winding 2. Diode 3. The armature winding 4 and the field winding 5 are arranged so that the brushless exciter 6 receives the voltage supplied from the stator winding of the mechanism 1 via the excitation transformer 9. The output current of the synchronous generator is measured by a measuring instrument 1 from a current detecting current transformer 11 provided on the bus 10.
2, the output voltage is measured by the measuring instrument 12 via the voltage detection transformer 13 and is input to the input side of the automatic voltage regulator 8. In such a configuration, 2
A transformer 13 whose next side voltage is low voltage is required, and if the output terminal voltage of the generator at this time is high voltage, the transformer 13 (
The problem is that the capacitance is relatively expensive (to ensure insulation distance). The same can be said of the excitation transformer. In other words, this voltage detection system has the disadvantage of being expensive.

The object of the present invention is to eliminate the above-mentioned drawbacks and provide a terminal voltage detection system that is less expensive. To achieve this objective, an auxiliary winding is provided in close proximity to the stator winding of a synchronous machine having a brushless exciter, and the terminal voltage of the auxiliary winding is detected by a voltage detection meter, and the terminal voltage is detected by a voltage detection instrument. This was input to an automatic voltage regulator that controls the excitation of the brushless exciter.

Embodiments of the present invention will be described below based on the drawings.

FIG. 2 shows an embodiment of the present invention, and the same members as in FIG. 1 are given the same reference numerals and will be explained.

In this case, the synchronous generator 1
An auxiliary winding 15 is provided close to the stator winding 14 housed in the groove 1b of the stator core 1a.
5 is measured by a voltage detection meter 12 and is input to an automatic voltage regulator 8 that controls excitation of the brushless exciter. In such a configuration, when the generator stator winding has 3 coils per pole per phase and the voltage generated by the generator per pole per phase is a vector of 03, it is fixed. The generated voltages of the stator windings distributed and wound around the child core are vector 01 (coil 1), vector 12 (next 2 coils), vector 23 (further next 3). coil). When the auxiliary winding 15 is wound in the groove 1b of the stator winding 14 at the same position as the vector in Table 12, a vector of 1'2' is obtained. The vector 1'2' of the voltage generated by the auxiliary winding a15 is proportional to the voltage generated in the entire stator winding (vector 03 multiplied by the pole 1 train circuit) and has the same phase. The voltage of the auxiliary winding 15 can be changed by changing the number of turns of the winding. Even if the voltage generated by the stator winding is high, the voltage of the auxiliary winding 150
It can be used as a generated image pressure. 16 in Fig. 3 is an excitation device for a synchronous machine filed by the same applicant (Utility Application No. 55-4)
8332), which shows an excitation auxiliary winding 16 and the voltage detection auxiliary winding 15 of the present invention.
You may swap the positions of . I explained it all the way to 1.
, the case of a synchronous motor %jL machine has been described, but it can be similarly applied to a synchronous motor.

According to this invention, an auxiliary winding for voltage detection is provided close to the stator winding, and the voltage generated in the auxiliary winding is detected to detect the terminal voltage generated in the stator winding.
Since this voltage is used as the detection voltage for excitation control of the brushless exciter, it can have the same function as using a voltage detection transformer, and is effective in configuring the voltage detection system at low cost. did it.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an example of a conventional terminal voltage detection system for a synchronous machine, and FIG. 2 is a circuit diagram of an embodiment of the present invention.
Figure 3 is a sectional view showing the installation location of the auxiliary winding coil;
The figure shows the phase of the generated voltage. 6: Brushless exciter, 8: Automatic voltage regulator, 12:
'! Voltage detection instrument 14: stator winding, 15: auxiliary winding. (5)

Claims (1)

[Claims] 1) An auxiliary winding is provided near the stator winding of a synchronous machine having a brushless exciter, and the terminal voltage of the auxiliary winding is detected by a voltage detection meter, and the terminal voltage is detected by the brushless excitation. A terminal voltage detection system for a synchronous machine, characterized in that the voltage is input to an automatic voltage regulator that controls excitation of the machine.