JPS63221257A - Converter - Google Patents

Abstract

PURPOSE:To accurately grasp a state right before the quantity of input electricity becomes 0 and to easily analyze operation even at the time of application to a data logger by holding a value corresponding to the quantity of electricity right before the quantity of input electricity becomes 0 and displaying it. CONSTITUTION:An input range is set with data from a set value deciding means 14 and data from an A/D converting means 9 is inputted to decide whether or not the data is 0. When the data is not 0, it is decided whether or not the data is within the set value range and when so, next data is inputted from the A/D converting means 9. When the data is not within the range, on the other hand, overloading is decided and the data is stored in a data holding means 15 successively; in time series. A breaker 19 is overloaded to get closed and when the data becomes 0, overload quantity data is read out of the data storage circuit 15 and the mean value of the data is calculated. This mean value is displayed on an overload quantity display device 4 through a display control means 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a converter that converts alternating current quantities of a power system into direct current signals.

(Prior Art) Various types of converters have been employed as converters for converting alternating current amounts of power systems into direct current signals and sending the direct current signals to data loggers, computer computers, and the like.

One example is an alternating current converter that converts the current of a power system. This AC current converter.

It inputs the amount of current and electricity from the power system, converts it into a DC signal based on this amount of current and electricity, and outputs it to the outside.

FIG. 5 shows an example of application of a conventional alternating current converter in a power system. In FIG. 5, the power system is configured to supply power from a power source 18 to a load 22 via a breaker 19. There is. Then, the electric current of the power system is extracted via the current transformer 20, and after facing the ammeter 21, it is input to the alternating current converter 23. A DC signal proportional to the amount of AC current in the power system is obtained from the AC current converter 23 and output to the outside.

(Problems to be Solved by the Invention) By the way, in this type of conventional AC current converter 23, when the above-mentioned conversion is being performed, the breaker 19 is activated due to overload, etc., and the power system is interrupted. When the circuit is cut off, the output becomes 0 and the indicated value of the ammeter 21 also becomes 0.

Therefore, it is very difficult to measure the amount of overload at the time of shutoff. In addition, the amount of load constantly fluctuates, and it is still difficult to accurately calculate the amount of overload at the time of shutoff. There is a problem in that the burden on the staff increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a converter that calculates and holds the amount of input electricity just before the power is cut off, so that it can be easily measured with the negative eye.

[Structure of the Invention] (Means for Solving the Problems) The converter according to the present invention inputs an AC quantity of electricity, converts it into a DC signal and outputs it, and outputs an analog signal proportional to the AC quantity of electricity. A/D converts signals into digital signals
a converting means; a data storage means for sequentially storing digital signal values from the A/D converting means in time series; The present invention is characterized by comprising a calculation means for reading data from the data storage means and calculating the average value thereof, and a display device for displaying the average value calculated by the calculation means.

(Function) In the present invention, a value corresponding to the amount of electricity immediately before the input amount of electricity becomes 0 is held and displayed, so that the input amount of electricity becomes 0.
It is possible to accurately grasp the state immediately before the situation occurs, and operation analysis, etc., becomes easy when applied to a data logger.

(Example) The present invention will be described below with reference to an example shown in the drawings. Note that here, a case where the present invention is applied to an alternating current converter will be described as an example.

FIG. 2 shows an external view of an alternating current converter according to the present invention. In Fig. 2, 1 is an AC current converter, and on the front side thereof are input value setting switches 2. It is equipped with a reset switch 3 and an overload amount indicator 4.

FIG. 1 shows in block form an example of the internal configuration of the above-described AC current converter 1, and the same parts as in FIG. 5 described above are given the same reference numerals.

In FIG. 1, the power system is configured to supply power from a power source 18 to a load 22 via a circuit breaker 19. Then, the amount of current electricity in this power system is determined by the current transformer 2
0 to the alternating current converter 1.

On the other hand, in the AC current converter 1, reference numeral 5 is a multi-connected AC current converter main body having the same functions as conventional ones, in which the input current quantity is rectified by a rectifier circuit 6, smoothed by a filter circuit 7, and Based on this, a DC signal output control section (not shown) performs external output control, and the output device 8 outputs the signal to the outside. 9 is an A/D conversion means which converts the analog signal output from the filter circuit 7 into a digital signal.

lO is a calculation means with an overload judgment function, and this ^/D
A digital signal from the conversion circuit 9 is input, and after predetermined calculations to be described later, are output as data for overload amount display control and data for overload amount output control.

Reference numeral 11 denotes a display control means that converts the overload amount display control data from the arithmetic means 10 having the overload determination function into overload amount display data, and displays this data on the overload amount display section shown in FIG. Display on 4. 16 is an output control means that converts the overload amount output control data from the calculation means 10 into overload amount output data, and outputs this to the overload output device 17. 15 is a data storage means and the above-mentioned calculation means 1
Data is saved according to commands from 0. Reference numeral 14 denotes a set value determining means for determining the set value input by the input value setting switch 2 shown in FIG. 2, and 13 represents a reset determination unit for determining the reset input by the reset switch 3 shown in FIG. It is a means.

FIG. 3 is a flowchart showing a specific example of determination and calculation in the above-mentioned calculation means 10.

In FIG. 3, an input value range is set in step 31 based on the data from the set value determining means 14 described above. Next, in step 32, data from the above-mentioned A/D conversion means 9 is taken in, and in step 33, it is determined whether this data is 0 or not. If it is determined that the result is not 0, the process proceeds to step 34, where it is determined whether the above-mentioned data is outside or within the set value range.

If it is determined that it is within the range, the process returns to step 32.

Further, if it is determined that the data is out of range (over), it is regarded as an overload and the data is sequentially stored in the data storage means 15 in chronological order as described above. In this way, the amount of overload at the time of overload is saved. When the above-mentioned circuit breaker 19 is cut off due to overload, the data becomes O, and it is determined as 0 in step 33, and based on this determination signal of 0, step 37
At this point, it is determined that an overload is to be cut off, and the overload amount data up to a preset time before that is read out from the data storage circuit 15 shown in FIG. 1, and the average value of the data is calculated. The reason for averaging the data is that the amount of load constantly fluctuates and that the amount of overload at the time of interruption can be accurately calculated. Based on the data in step 37, in step 38, overload amount display control data to be sent to the display control means 11 described above is created. Further, in step 39, the above-mentioned output control means 1
Create overload amount output control data to be sent to 6.

In step 36, data reset in steps 35 and 37 is performed in response to a signal from the reset determination means 13 described above.

In this way, by applying the AC current converter 1 of this embodiment to the conversion of the amount of current and electricity in the power system.

The amount of overload at the time of shutoff due to overload can be easily measured, and the amount of overload can be outputted to the outside.

It should be noted that the present invention is not limited to the embodiments described above, but can be similarly implemented in the following manner.

(,) In the above embodiment, the overload amount is displayed numerically, but the present invention is not limited to this, and a bar display or the like as shown in FIG. 4 may be used.

(b) In the above embodiment, the present invention is applied to an AC current converter, but the present invention is not limited to this, but can be applied to an AC voltage converter,
The present invention can be similarly applied to other converters such as active power converters, reactive power converters, phase angle converters, and power factor converters.

〔Effect of the invention〕

As explained above, according to the present invention, in a converter that receives a predetermined amount of electricity from a power system as input, converts it into a DC signal proportional to the input amount of electricity, and outputs it to the outside, Since the amount of electricity immediately before the input amount of electricity becomes 0 is displayed, there is an effect that operation analysis etc. are facilitated.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a converter according to the present invention, FIG. 2 is an external view of a converter according to an embodiment of the present invention,
FIG. 3 is a flowchart of the same embodiment, FIG. 4 is an external view of a converter according to another embodiment of the present invention, and FIG. 5 is a configuration diagram showing an example of application of a conventional converter in an electric power system. 1... Converter 4... Display 5... Converter body 9... A/D conversion means 10... Calculation means 15... Data storage means Agent Patent attorney Noriyuki Chika Yudo Hirofumi MitsumataFigure 2Figure 3Figure 4

Claims (1)

[Scope of claims] A converter that inputs an alternating current quantity of electricity, converts it into a direct current signal, and outputs it, comprising: an A/D conversion means that converts an analog signal proportional to the alternating current quantity of electricity into a digital signal; a data storage means for sequentially storing digital signal values from the A/D conversion means in chronological order; reading the digital signal values from the time when the digital signal becomes 0 until a preset time before from the data storage means; A converter comprising: a calculation means for calculating the average value; and a display for displaying the average value calculated by the calculation means.