JP2531558Y2 - Electric output display of engine driven generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a device for displaying an electric output such as a voltage and a current of a generator in an engine-driven power generation device such as a cogeneration device or an engine generator.

<Prior Art> This type of electric output display device is generally configured as shown in FIG.

That is, the output circuit 3 of the generator 2 driven by the engine 1
The current transformer for current detection which is the electric output detection means
4h and a transformer 9 for voltage detection, etc., and the current transformer 4h and the transformer 9 are connected to the display means 6 via the analog circuit 8 and the central processing unit 7 in this order.
Thus, the central processing unit 7 controls the display means 6 based on the output signal to display the voltage and current of the generator.

In the above conventional configuration, the relatively inexpensive current transformer 4h
Since the transformer 9 is used, a measurement error and a display error which cannot be ignored by the inexpensive current transformer 4h and the transformer 9 occur. Therefore, in order to eliminate the display error caused by the current transformer 4h and the transformer 9, the calibration ammeter 10a and the calibration voltmeter 1
0b is additionally provided as shown in the figure, and an accurate voltage value and current value of the generator 2 are measured. Then, based on the accurate calibration voltage value and calibration current value, the variable resistor 8a
By adjusting 8b, the display value based on the measurement output signal of the current transformer 4h or the transformer 9 is individually corrected. In other words, the correct electric output is displayed by the above-mentioned correction while using the relatively inexpensive current transformer 4h and the transformer 9.

<Problem to be solved> However, the variable resistor 8a in the analog circuit 8,
Adjustment of 8b is delicate and difficult, so misalignment may occur.To eliminate this, considerable experience and skill are required, it is not a work that anyone can do, and even after adjustment, The adjustment position of the variable resistors 8a and 8b was out of order, or the resistance value of the variable resistors 8a and 8b was changed due to the change in the ambient temperature, and the correction value was out of order.There were difficulties in accuracy and long-term reliability. .

<Means for Solving the Problems> In order to eliminate such difficulties in the related art, the present invention employs an output circuit 3 of a generator 2 driven by an engine 1 as shown in FIGS. 1 and 2, for example. The electric output detecting means 4h and 9 are provided, and the electric output measured value of the electric output detecting means 4h and 9 is displayed on the display means 6 via the analog circuit 8 and the central processing unit 7 in order. The storage device 11 is connected to the processing device 7, and the display calibration electric output measuring devices 10a and 10b are additionally connected only during the trial operation adjustment so that the display calibration output can be measured. Compensation information for the measured electrical output value from the analog circuit 8 is calculated by the central processing unit 7 based on
The correction information is transferred to the storage device 11 and stored therein. During normal operation, the measured electrical output value from the analog circuit 8 is corrected by the correction information read from the storage device 11, and then displayed on the display unit 6. It is characterized by that.

<Operation> In the present invention, the electric output measured value signal from the electric output detecting means 4h and 9 is input into the central processing unit 7 via the analog circuit 8. On the other hand, an accurate display calibration output can be measured by the display calibration measuring instruments 10a and 10b additionally connected only at the time of the trial operation adjustment, and the display calibration measurement value is directly or via the keyboard 5c. Is entered in Then, in the central processing unit 7, the measured value of the electric output from the analog circuit 8 is compared with the accurate measured value for display calibration, and correction information is obtained. The central processing unit 7 transfers the correction information to the storage device 11 for storage. During normal operation, the measured electrical output value from the analog circuit 8 is corrected by the correction information read from the storage device 11 in the central processing unit 7 and then displayed on the display means 6.

<Embodiment> Hereinafter, an embodiment in which the present invention is applied to a cogeneration apparatus will be described in detail with reference to FIGS.

FIG. 1 is a block diagram of the electric output display device of the engine-driven power generator during a test operation, FIG. 2 is a block diagram of the same during normal operation, and FIG. FIG. 4 is an explanatory view of the wiring structure in the control panel.

FIG. 3 shows an operation control panel 4 of a cogeneration system that supplies power by connecting an output circuit 3 of a generator 2 driven by an engine 1 to loads via terminals 3a and 3b, and a control controller 5 It comprises an operation lamp 5a, an abnormality display lamp 5b, a keyboard 5c, an emergency stop button 5d, a display means 6, and the like.
Governor controller 4a, terminal block 4b, hour meter 4c, oil pressure gauge 4d, breaker 4e, AVR 4f, relay 4g, current transformer 4
h, a voltage detection transformer (not shown) and the like are installed in the operation control panel 4. The display device 6 is the generator 2
A liquid crystal display is used for displaying an electric output, an engine operation state, and a hot water supply state.

As shown in the block diagram of FIG. 1, a transformer 9 as an electric output detecting means is connected in parallel to the output circuit 3 of the generator 2 between the terminals 3a and 3b, and a current transformer 4h as the same means is connected to the terminals.
It is connected in series between 3b and the generator 2. Transformer 9
And the load current value detected by the current transformer 4h are once converted to display values through an analog circuit 8 in the controller 5 according to a certain conversion formula in the central processing unit 7.

At the time of test run adjustment, as shown in FIG. 1, the ammeter 10a and the voltmeter 10b, which are the electric output measuring devices for display calibration, are connected simultaneously, and the output voltage and the load current are measured. Input to the processing device 7. The central processing unit 7 compares the display value from the analog circuit 8 with the measurement value from the keyboard 5c to obtain correction information, transfers the correction information to the storage device 11 composed of a nonvolatile memory, and stores the correction information.
After correcting the display value with the correction information, the liquid crystal display 6 as a display means is displayed as a voltage / current value.

In this case, the measurement values are input using the keyboard 5c. However, the measurement values can be directly supplied from the calibration measuring instruments 10a and 10b to the central processing unit 7, and can be automated without obtaining them.

During normal operation, as shown in FIG. 2, the central processing unit 7 calculates and corrects the display value from the analog circuit 8 using the correction information read from the storage device 11, and then causes the display means 6 to display the corrected value.

In the figure, the generator output is shown as a single phase, but this can be similarly applied to a three-phase or other multi-phase generators. There is no.

FIG. 4 shows a conventional printed circuit board 12 in which wiring in the operation control panel 4 such as the governor controller 4a, the hour meter 4c, the relay 4g, and the current transformer 4h is manually performed. Collectively harness connector
13a, 13b, 13c, 13d, etc., which have the effects of reducing assembly man-hours, preventing wiring mistakes, preventing erroneous vibrations due to noise, improving maintenance, etc. as compared to conventional manual work, and leading to mass production. Can respond.

<Effects of the Invention> As described above, the present invention is the same as the conventional example in that an accurate display calibration measurement value from a display calibration measuring instrument additionally connected only during trial operation adjustment is used as a reference. However, in place of the conventional adjustment of the variable resistor, correction information for the electric output measurement value from the electric output detection means 4h · 9 is obtained by comparison calculation in the central processing unit, and the correction information is stored in the storage device. During normal operation, the measured electric output is corrected with the correction information read from the storage device 11 and displayed, so that the comparatively inexpensive electric output detecting means is used, but compared to the conventional variable resistor adjustment. This eliminates the need for a variable resistor or an adjustment expert. In addition, since the variable resistor is omitted, accurate and highly reliable display of the electric output can be expected without being affected by the vibration and the change of the ambient temperature.

[Brief description of the drawings]

FIGS. 1 to 4 show an embodiment of the present invention. FIG. 1 is a block diagram of an electric output display device of an engine-driven power generator at the time of trial operation, FIG. FIG. 4 is a front view of a main part of an operation control panel of the engine-driven power generator, and FIG. 4 is an explanatory diagram of a wiring structure in the control panel. Fifth
The figure shows a conventional example and is a figure corresponding to FIG. 1 ... engine, 2 ... generator, 3 ... output circuit, 4 ...
... Operation control panel, 5 ... Controller, 6 ... Display means, 7 ... Central processing unit, 8 ... Analog circuit, 4h / 9
... Electrical output detecting means, 10a and 10b ... Electrical output measuring instruments for display calibration, 11 ... Storage device.

Claims (1)

(57) [Scope of request for utility model registration] 1. An output circuit 3 of a generator 2 driven by an engine 1 is provided with electric output detecting means 4h.9, and the measured electric output of the electric output detecting means 4h.9 is converted into an analog circuit 8 and a central processing unit. 7 are sequentially displayed on the display means 6, and a storage device 11 is connected to the central processing unit 7, and the display calibration electric output measuring devices 10 a and 10 b are additionally connected only during the trial operation adjustment. The display calibration output is configured to be measurable, and the central processing unit 7 calculates correction information for the electrical output measurement value from the analog circuit 8 based on the display calibration measurement value, and stores the correction information. It is configured to be transferred to the device 11 and stored therein, and that during normal operation, the measured electrical output value from the analog circuit 8 is corrected by the correction information read from the storage device 11 and then displayed on the display means 6. Electrical output display system for an engine driven generator unit to.