JPH0475500A - Portable engine generator - Google Patents

Abstract

PURPOSE:To ensure adequate operation of a load by comprising a generator to be driven by an engine to output power of the predetermined voltage, a main power outputting means for outputting in direct an output of generator and a subpower outputting means for outputting an output of generator through voltage stabilization control. CONSTITUTION:A portable engine generator 1 supplies in direct an output of a 3-phase synchronous generator 5 to the main power supply output terminal 37. Moreover, an output of generator 5 is controlled to the predetermined voltage by LRT and is then supplied to the subpower supply output terminal 39. Accordingly, the power supply voltage to be supplied to the subpower supply output terminal 39 becomes a constant voltage almost not affected by variation of output voltage of the 3-phase synchronous generator 5. Thereby, the range for adequate operation of the electromagnetic switches 129, 131 for making ON and OFF the current to motor can be widened by connecting a motor control panel 100 to the portable engine generator 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a portable engine generator that is transported to a civil engineering work site and supplies electric power to civil engineering machinery, temporary power demand equipment, and the like.

[Prior Art] Conventionally, a portable engine power generation device is transported to a civil engineering work site and uses steel pipe piles with an electric motor load of several tens to several kilowatts + KW.
It is used to supply power to vibro hammers used for driving and pulling out H-shaped steel piles and stand pipes, and to earth augers used for pre-boring, digging, and excavating cast-in-place concrete piles.

As shown in Fig. 3, such a portable engine power generator uses an automatic voltage regulator (hereinafter simply A
VR) is controlled to a predetermined value to supply power to a predetermined power load, for example, a motor load as a main load or a control circuit load of 1 to several kW.

In the motor load, which is the main load of the generator, especially when the power is turned on, a starting current several times the motor rating flows through the motor load, which may cause a large instantaneous drop in the output voltage of the generator.

Furthermore, the control circuit may not operate properly if the input voltage fluctuates significantly. For example, if the input voltage drops by 20% or more, the electromagnetic contactor used to turn the motor on and off may unexpectedly release, stopping the power supply to the motor. There was.

For this reason, conventional methods have been used to ensure that the output capacity of the generator is at least three times the capacity of the motor in order to prevent a malfunction in the control circuit even if a starting current several times the rated value flows when the motor is turned on. [Problems to be Solved by the Only One Invention] However, such a generator capacity is required only when starting the electric motor, and is not required during normal operation.

For this reason, conventionally, a portable engine power generation device having an output capacity that is excessively large compared to the load capacity during steady state has been installed, which has led to the problem of wasting installation costs, installation space, and operating costs.

An object of the present invention is to solve the above-mentioned problems and provide a portable engine power generator that ensures appropriate operation of the load simply by having an output capacity corresponding to the load capacity.

[Means for Solving the Problems] As a means for achieving the above object, the portable engine power generator of the present invention can be transported to a civil engineering work site and supply power to a load! In the #2 type engine power generator, a generator that is driven by the engine and outputs power at a predetermined voltage;
The gist is to include a main power output means that outputs the output of the generator as it is, and a sub power output means that outputs the output of the generator after further voltage stabilization control.

1 Effect] The portable engine power generation device of the present invention outputs electric power of a predetermined voltage from the generator driven by the engine, and this output is output as it is from the main power output means, and the output of the generator is further outputted from the main power output means. The voltage is stabilized and output from the auxiliary power output means.

Thereby, even if the output voltage of the generator fluctuates greatly, the output voltage of the auxiliary power output means is independently controlled to a predetermined value. Therefore, one main power output means is connected to a load such as a motor that allows fluctuations in the supply voltage by about ±50%, and the other sub power output means is connected to a control circuit or temporary lighting power load that requires high voltage accuracy. Can be used to connect. As a result, even if a motor load having a capacity close to the output capacity of the generator is connected, the motor can be started up and operated normally, and the control circuit can be operated normally.

[Example] Next, an example of a portable engine power generator 1 according to an example of the present invention will be described. As shown in FIG. 1, the portable engine power generator 1 includes a diesel engine 3, a three-phase synchronous generator 5, a generator control device 7, an auxiliary power control device @9, and an output terminal board 11. We are prepared.

The diesel engine 3 includes a starting device, an engine control device, etc. (not shown).

The three-phase synchronous generator 5 is connected to its rotor (not shown) or to the diesel engine 3, and includes a field winding (not shown) for excitation.

The generator control device 7 includes an exciter 13 and a generator automatic voltage adjustment circuit AVR1 (hereinafter simply referred to as AVRl).
etc., and controls the exciter 13 by comparing the output voltage of the three-phase synchronous generator 5 with a reference voltage. The exciter 13 is an AV
The excitation current is controlled based on the signal from Rl. With the configuration described above, the generator control device 7 controls the output voltage of the generator 5 to a predetermined value.

The auxiliary power supply control device 9 is a load tap switching transformer LRT.
(hereinafter simply referred to as LRT), an automatic voltage adjustment circuit for LRT AVR2 (hereinafter simply referred to as AVR2), and a tap switching control circuit 19. The LRT includes a tap change transformer 21 and an electric operating mechanism 23. The electric operating mechanism 23 switches the taps of the tap switching transformer 21 using electric power. The AVR 2 compares the output voltage of the tap change transformer 21 with a set voltage preset by a voltage setting device (not shown), and outputs a tap increase signal or decrease signal to one tap change control circuit. . The tap switching control circuit 19 controls the electric operating mechanism 23 based on the up or down signal from the AVR 2. A signal line 25 for transmitting the state of the electric operating mechanism 23 to the tap switching control circuit 19 is connected to the tap switching control circuit 19 and the electric operating mechanism 23 , and a signal line 25 for transmitting the state of the electric operating mechanism 23 to the tap changing control circuit 19 . A signal line 27 for control is provided.

The output terminal board 11 has a circuit breaker 30°31,
It has a main power output terminal 37 and a sub power output terminal 39. One circuit breaker 30 is connected to the generator 5. The other circuit breaker 31 is connected to the tap-changing transformer 21 . Both circuit breakers 30 and 31 provide "on" and "off" circuit and overcurrent protection. The main power output terminal 37 (which is connected to the circuit breaker 30 and directly outputs the power generated by the generator 5) is connected to the circuit breaker 31 and which connects the tap changer transformer 2.
1 outputs the generated power of the generator 5 whose voltage is stepped up or stepped down.

In the portable engine power generator 1 described above, the output of the three-phase synchronous generator 5 is directly supplied to the main power output terminal 37. Further, the output of the generator 5 is controlled to a predetermined voltage by the LRH and then supplied to the sub power output terminal 39. Therefore, the power supply voltage supplied to the auxiliary power supply output terminal 39 becomes a constant voltage that is hardly affected by fluctuations in the output voltage of the three-phase synchronous generator 5.

As a result, a motor control panel 100 as shown in FIG. 1 is connected to the portable engine generator 1, and an electromagnetic switch 129. It is possible to widen the range in which the m31 operation can be performed appropriately. For example, when the motor connected to the motor control panel 100 starts up, the output voltage of the generator 5 is reduced by 50%.
Even if the degree is reduced, the electromagnetic switches 129 and 131 will not be released, and the motor can be started appropriately.

As a result, there is no need to make the output capacity of the portable engine generator 1 unnecessarily large compared to the load capacity of the electric motor connected to the main power output terminal 37.

Therefore, when using the same load capacity, the capacity of the portable engine generator 1 can be reduced, and the installation cost and
This has the extremely excellent effect of reducing installation space, operating costs, and transportation costs.

Note that the present invention is not limited to the above-mentioned embodiments, and can be implemented in various forms without changing the gist of the present invention.

For example, instead of the sub power supply control device 9 shown in FIG.
A configuration using a stabilized power supply device 109 as shown in the figure may also be used. This makes it possible to further reduce the voltage fluctuation rate of the auxiliary power supply output to the auxiliary power supply output terminal 139, making it possible to supply power to loads that require high voltage accuracy. The stabilized power supply device 109 outputs constant voltage and constant frequency output power by using an AC inverter method.

Furthermore, by using a DC stabilized power supply, a DC constant voltage output voltage is output. Alternatively, the stabilized power supply device 109
By incorporating multiple inverters and DC stabilized power supplies, they are independent from each other and output multiple different types of power supplies.

Effects of the Invention] The portable engine power generation device of the present invention includes a main power output means that outputs the output of the generator as it is, and a sub power output means that outputs the output of the generator after further voltage stabilization control. ing. As a result, the output of the auxiliary power output means is hardly affected by voltage fluctuations in the generator output. As a result, it has become possible to connect a load that instantaneously flows a large current, such as an electric motor, to the main power output means, and connect a load that requires voltage accuracy, such as a control circuit, to the auxiliary power output means. If this is done, the output capacity of the generator can be reduced to a value close to the capacity of the motor while ensuring the normal operation of the control circuit, reducing installation costs, transportation costs, operating costs, and installation space. This has an extremely excellent effect of reducing the amount of water used.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a possible I# type engine generator according to an embodiment of the present invention, FIG. 2 is a block diagram of a modified example, and FIG.
The figure is a configuration diagram of a conventional portable engine power generator. 1... Portable engine generator 3... Diesel engine 5... Three-phase synchronous generator 7... Generator control 11 Device 9... Sub-power supply control! I device 11... Output terminal board 109... Stabilized power supply device

Claims (1)

[Scope of Claim] A portable engine power generator that is transported to a civil engineering work site and supplies power to a load, comprising: a generator that is driven by an engine and outputs power at a predetermined voltage; and a generator that directly outputs the output of the generator. A portable engine power generation device comprising: a main power output means for controlling the output of the generator; and a sub power output means for further voltage stabilizing and outputting the output of the generator.