JPS6226995Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a load device for an engine generator, especially a load device that improves the power factor by using a phase advance capacitor for an inductive load and then loads the engine generator. This relates to a load device for an engine generator that prevents the output voltage of the generator from increasing due to the phase advance capacitor acting as a load on the engine generator when the inductive load is disconnected. .

Conventionally, when an inductive load is connected to an engine generator, a phase advancing capacitor is used in combination to improve the power factor so that other loads are not affected by voltage drop or the like. Therefore, when the inductive load is disconnected, the phase advancing capacitor becomes a load, but at this time, it becomes a capacitive load for the engine generator, causing the output voltage to rise undesirably and damaging other loads. occurred.

The purpose of this invention is to solve the above problem, and when the inductive load is disconnected, the phase advance capacitor that improves the power factor is also disconnected at the same time, so that the load on the generator is undesired. The purpose is to prevent capacitive loads. Therefore, the engine generator load device of the present invention detects disconnection of the inductive load in a device that uses a phase advancing capacitor for the inductive load to improve the power factor and then uses it as the engine generator load. Based on the signal from the detection part, the switch part connected in series to the phase advance capacitor is forcibly operated at the same time as the inductive load is disconnected, the phase advance capacitor is also disconnected, and the engine generator is disconnected. It is characterized by preventing the output voltage from increasing. The inductive load will be explained below with reference to the drawings, taking as an example a mercury lamp and a ballast for stabilizing its operation.

FIG. 1 shows a conventional engine generator load device, FIG. 2 shows an embodiment of the engine generator load device of the present invention, and FIGS. 3 and 4 show another embodiment of the present invention. There is.

In the figure, 1 is a mercury lamp, 2, 2-1, 2-2, 2-
3 is a stabilizer, 3 is a chiyoke coil, 4 is a phase advance capacitor, 5 is a generator, 6 is a rotor winding, 7 is a stator winding, 8 is an excitation winding, 9, 12, 21 are a rectifier , 10 and 22 are capacitors, 11 is a slip ring, 13 is a voltage control section, 14 and 23 are resistors, 15 and 17 are switches, 16 is another load, 1
8 represents a drive winding, 19 a contact, 19' a thyristor, and 20 a current transformer.

In FIG. 1, although the generator 5 is already known, it will be briefly explained. After the alternating voltage generated across the excitation winding 8 is rectified by the rectifier 9,
A DC voltage for excitation is obtained across the capacitor 10 by smoothing it by the capacitor 10 . One end of the capacitor 10 is connected to one end of the rotor winding 6 via a slip ring 11.
The other end is connected to the rotor winding via a voltage control unit 13 that chopper controls the voltage applied to the rotor winding 6 and a slip ring 11 in order to keep the output voltage of the stator winding 7 constant. 6 is connected to the other end. The rotor winding 6 is driven by an internal combustion engine.

In the figure, 17 is a switch that turns on/off the voltage applied to the mercury lamp 1, other loads 16, etc. 15 is a switch that turns on and off the mercury lamp 1.

2 in the figure is a ballast, and in order to obtain the voltage-current characteristics of the mercury lamp 1, there is a chiyoke coil 3 connected in series to the mercury lamp 1, and a chiyoke coil 3 connected in series to the mercury lamp 1.
It consists of a phase advancing capacitor 4 and a resistor 14 inserted to improve the power factor of the coil 3.

In the case of the conventional configuration shown in FIG. 1, the phase advance capacitor 4 in the ballast 2 is always inserted between the lines, so the mercury lamp 1 can be turned off by, for example, turning off the switch 15 or disconnecting the mercury lamp 1. Then, the chiyoke coil 3 is electrically removed, and the phase advancing capacitor 4 becomes a load. In this way, a large number of mercury lamps 1 are connected, and each mercury lamp 1 is connected to the switch 15.
When the generator 5 is turned off, it becomes a capacitive load despite the presence of other loads 16, a phase-advanced current flows through the generator 5, and a relatively high voltage is generated in the stator winding 7. As a result, electronic devices and the like of other loads 16 may be damaged. This high voltage generation is based on the following reasons. In other words, when the load becomes capacitive and a phase-advanced current flows through the stator winding 7, a voltage is induced from the stator winding 7 to the stator winding 6, and the voltage induced in the rotor winding 6 causes A DC excitation current is supplied to the rotor winding 6 through the flywheel diode 12. In this case, the voltage generated in the stator winding 7 is detected and the voltage controller 13
works to keep the excitation current from the excitation winding 8 in a cut-off state, but the voltage control section 13 has the function of limiting the current induced in the rotor winding 6 as described above and flowing through the diode 12. Otherwise, the voltage generated in the stator winding 7 may rise to about 150% of the rated voltage. In other words, in the generator 5 shown in FIG.
Because the wheel diode 12 is provided, when the generator 5 is loaded with a capacitive load as described above, the generator 5 is a so-called nonaka type generator
The generator operates in the manner of a self-excited synchronous generator (as shown in No. 2367), and the voltage of the generator 5 increases to about 150% despite the presence of the voltage controller 13. and induce other load damage.

The present invention solves this problem, and when the inductive load is disconnected, the phase advance capacitor that improves the power factor of the inductive load is also disconnected at the same time.

FIG. 2 shows an embodiment of the present invention. In the figure, 1, 3, 4, 5, 14, 15, and 17 are the same as those in FIG. 1, so their explanation will be omitted.

The ballast 2-1 includes the above-described chiyoke coil 3, a phase advance capacitor 4, a resistor 14, a contact 19 for turning on/off the connection of the phase advance capacitor 4, and a detection winding for detecting whether or not the mercury lamp 1 is connected. It is composed of a drive winding 18 that also serves as a drive winding 18 and opens and closes the contact 19.

When mercury lamp 1 is connected and lights up, code A,
Chiyoke Coil 3, Switch 15, Suigintou 1,
The drive winding 18 constitutes an inductive load circuit denoted by B, and when current flows through the drive winding 18, the contacts 19 are closed. Therefore, a phase advancing capacitor 4 is inserted between the lines A and B to improve the power factor.

On the other hand, the mercury lamp 1 can be removed by, for example, turning off the switch 15 or removing the mercury lamp 1 from the socket.
When the inductive load circuit is disconnected, the inductive load circuit is no longer established and no current flows through the drive winding 18, so the contact 19 becomes open. Therefore, the phase advance capacitor 4 is separated from the lines A and B. That is, the phase-advanced current will not flow into the generator 5, the voltage increase of the generator 5 due to the inflow of the phase-advanced current described above is prevented, and damage to other load equipment is avoided.

FIG. 3 shows another embodiment of the present invention, in which detection of the presence or absence of connection of the mercury lamp 1 explained based on FIG. 2 is performed using a current transformer 20 instead of the drive winding 18. It is. In the figure, 1, 3,
4, 5, 14, 15, and 17 correspond to those in FIG. 1, and 18 and 19 correspond to those in FIG.
Since these are the same as those in FIGS. 1 and 2, their explanation will be omitted.

The ballast 2-2 includes the above-described chiyoke coil 3, the phase advance capacitor 4, the resistor 14, the contact 19 that connects and disconnects the phase advance capacitor 4, and the contact 1.
The drive winding 18 opens and closes the mercury lamp 9, and also serves as a detection winding to detect whether or not the mercury lamp 1 is connected.
It is comprised of a current transformer 20 that allows current to flow through the drive winding 18.

When mercury lamp 1 is connected and lights up, code A,
Chiyoke Coil 3, Switch 15, Suigintou 1,
The primary winding of the current transformer 20 constitutes an inductive load circuit labeled B, and the current transformer 2
The voltage generated in the secondary winding 0 is applied to the drive winding 18, resulting in the contact 19 being closed. . Therefore, a phase advance capacitor 4 is inserted between the lines A and B,
Power factor improvement is performed.

On the other hand, the mercury lamp 1 can be removed by, for example, turning off the switch 15 or removing the mercury lamp 1 from the socket.
When the inductive load circuit is disconnected, the inductive load circuit is no longer established, and the contact 19 becomes open. Therefore, the phase advancing capacitor 4 is separated from the lines A and B. That is, as explained in FIG. 2, no leading phase current flows into the generator 5, and the voltage increase of the generator 5 due to the above-mentioned flowing of the leading phase current is prevented.

FIG. 4 shows another embodiment of the present invention, in which the presence or absence of connection of the mercury lamp 1 is detected using a current transformer 20 similar to that in FIG.
This is an embodiment in which a thyristor 19' is used to turn on and off the connection. 1, 3, 4, 5, 14, 15, 1 in the diagram
7 corresponds to that in FIG. 1, and 20 corresponds to that in FIG. Since these are the same as those in FIGS. 1 and 3, their explanation will be omitted.

The ballast 2-3 includes the above-described Chiyoke coil 3, a phase advance capacitor 4, a resistor 14, a thyristor 19' that connects and disconnects the phase advance capacitor 4, a capacitor 22 that triggers the thyristor 19', and a resistor. 23 and a rectifier 21, and a current transformer 20 which also serves as a detection winding for detecting the presence or absence of connection of the mercury lamp 1 and applies voltage to the rectifier 21.

When mercury lamp 1 is connected and lights up, code A,
Chiyoke Coil 3, Switch 15, Suigintou 1,
The primary winding of the current transformer 20 constitutes an inductive load circuit labeled B, and the current transformer 2
A voltage is generated in the secondary winding of 0. This current
The voltage generated in the secondary winding of the transformer 20 is applied to the rectifier 21, rectified into direct current, and then applied to the trigger terminal of the thyristor 19'. The trigger voltage applied to the trigger terminal of thyristor 19' is
When the voltage is sufficient to make thyristor 19' conductive, the trigger voltage causes thyristor 1 to become conductive.
9' becomes conductive. When the thyristor 19' becomes conductive, the phase advance capacitor 4 is inserted between the lines A and B, and the power factor is improved. Note that since the thyristor 19' is bidirectional, the trigger voltage applied to the trigger terminal of the thyristor 19' makes the thyristor 19' conductive regardless of whether the AC voltage of the generator 5 is positive or negative. Needless to say, if the voltage is sufficient, the trigger voltage will cause the thyristor 19' to become conductive.

On the other hand, the mercury lamp 1 can be removed by, for example, turning off the switch 15 or removing the mercury lamp 1 from the socket.
When disconnected, the inductive load circuit is no longer established, no trigger voltage is applied to the trigger terminal of thyristor 19', and thyristor 19' becomes non-conductive. Therefore, the phase advancing capacitor 4 is separated from the lines A and B. That is, the second
As in the case of FIGS. 3 and 3, no leading phase current flows into the generator 5, and a voltage rise in the generator 5 due to the flowing of the leading phase current is prevented.

As explained above, according to the present invention, a detection section for detecting connection of an inductive load is provided, and a switch section for turning on/off a phase advancing capacitor is provided, and a phase advancing capacitor is provided in response to disconnection of an inductive load. Since the load circuit is configured so that the capacitors are disconnected at the same time, there is no longer a capacitive load based on the phase advance capacitor, which prevents overvoltage from occurring in the generator and prevents damage to other load equipment.

[Brief explanation of the drawing]

FIG. 1 shows a conventional engine generator load device, FIG. 2 shows an embodiment of the engine generator load device of the present invention, and FIGS. 3 and 4 show another embodiment of the present invention. . In the figure, 1 is a mercury lamp, 2, 2-1, 2-2, 2-
3 is a ballast, 3 is a chiyoke coil, 4 is a phase advance capacitor, 5 is a generator, 18 is a drive winding, 19
is a contact, 19' is a thyristor, and 20 is a current.
It represents trance.

Claims (1)

[Scope of utility model registration request] A stator winding, an excitation winding provided at a position 90 degrees electrically different from the stator winding, a rectifier that rectifies the voltage generated by the excitation winding, and a rectifier that rectifies the voltage generated by the excitation winding. It has a rotor winding that generates excitation magnetic flux based on the applied voltage, and flywheel diodes installed at both ends of the slip ring. In a load device for an engine generator that connects an inductive load in combination with a capacitor for phase advancement, it is equipped with a detection section that detects the connection of an inductive load, and a switch section is provided in series with the above-mentioned phase advance capacitor to detect the inductive load. A load device for an engine generator, characterized in that the switch section is operated depending on whether or not a load is connected, and a phase advance capacitor is turned on and off to prevent overvoltage from occurring in the engine generator.