JP2679170B2 - Auto-scale graph recording system for leakage current recorder - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a low-voltage electric power distribution system, in which a leakage current generated in a two-type ground of a transformer or a low-voltage electric path itself is continuously measured and recorded. The present invention relates to a current recording device.

2. Description of the Related Art Conventionally, when a leakage current value exceeds a certain level in this type of leakage current recording device, the leakage current waveform before and after the occurrence is recorded, and the leakage current waveform is set after setting the graph range. A pen writing recorder or the like that outputs continuously has been put to practical use.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In such a conventional configuration, shocker-like temporary recording is used only, and continuous recording is mostly artificial manual sampling recording, and in the pen writing recorder system, After data output, it is necessary to organize data such as range and time conversion.

Therefore, the present invention provides quantitative and continuous data by means of a graph print record, and the necessary data can be immediately obtained from the data.

Means for Solving the Problems The present invention comprises a leakage current detection unit, a maximum current value update memory unit, a clock / calendar unit, a display unit and a recording unit, and a recording result printing command is issued as a recording method of the recording unit. It is a printing and recording method that makes it possible to obtain quantitative continuous data by setting a value that does not exceed the maximum value of the last update at that time as a full scale value and outputting the data in a bar graph at regular time intervals.

Operation In the above means, the leakage current is continuously sampled to detect the level without leakage even if it is an instantaneous value, and the graph scale is set according to the final leakage current maximum value that is comparatively updated in the current maximum update memory section. Then, the data is provided by printing and recording the bar graph.

Embodiment An embodiment of the present invention will be described below with reference to FIG.

In the figure, reference numeral 1 is a leak current sensor for detecting a leak current of an AC circuit, and its output is given to a leak current detecting section 2 so that continuously sampled data is displayed at a constant time interval of a clock / calendar section 6. In response to the signal, the maximum value of the leakage current within the time is updated in the first-stage maximum current value detector 3 each time sampling is performed.

The data detected here is held in the first-stage maximum current value memory unit 4 that holds the data, and the comparison update unit 5
Thus, the maximum current value for one day is detected and held in the second stage maximum current value memory unit 8.

When the totaling result print command is input from the clock / calendar unit 6 and the outside, the maximum leakage current data at a constant time interval is printed in a bar graph. At this time, this device is finally updated in the graph scale setting value unit 7. The graph full scale according to the maximum leakage current value is automatically selected from 10, 50, 100, 500, 1000 mA, and with the graph format that displays 1/2 full scale value that is 1/2 of the selected full scale, The bar graph is printed and recorded.

EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to immediately obtain the occurrence frequency of a leakage current of a certain level or more and the leakage current value thereof, and promptly obtain the data for grasping the actual condition of the leakage current at the site. .

In addition, the amount of recorded data is smaller than that of continuous waveform output data even during long-term measurement, and data organization is easy.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of a leakage current recording apparatus showing an embodiment of the present invention. 2 ... Leakage current detection unit, 3 ... First stage current maximum value detection unit, 4 ... First stage current maximum value memory unit, 5 ... Comparison update unit, 6 ... Clock / calendar unit, 7 ... Graph scale setting value section, 8 ... Second stage maximum current value memory section, 9 ... Display section, 10 ... Recording section.

Front page continuation (72) Inventor Makoto Yanagi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Yamane, 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56 ) Reference JP-A-56-84516 (JP, A) JP-A-62-220813 (JP, A) Actually opened 59-34366 (JP, U) Actually opened 58-47169 (JP, U)

Claims (1)

(57) [Claims] Claim: What is claimed is: 1. An apparatus for continuously sampling, measuring and recording a leakage current, comprising a leakage current detection section, a maximum current value memory section, a clock / calendar section, a display section and a recording section, and a recording section. As a recording method of, a program for recording by a bar graph, and means for holding the data by detecting the maximum value of the leakage current within a fixed time at fixed time intervals, and the data and the maximum leakage current value of the day. By comparing and updating the maximum leakage current value of the day or holding it automatically, the graph full scale corresponding to the maximum leakage current value of the day is automatically selected, and the detected leakage current value is printed and recorded as a bar graph and the graph full scale An auto-scale graph recording method for leak current recorders, which also records 1/2 full-scale value, which is 1/2 value.