JP2679171B2 - Leakage current recorder - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leakage current recording device for continuously measuring and recording leakage current during maintenance and management of electric equipment.

2. Description of the Related Art Conventionally, there is a pen writing recorder for continuous recording. In addition, a device that records the waveform and current value when the current value exceeds a set value has been put into practical use.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In general, when an earth leakage breaker operates, it is urgently necessary to quickly find out the cause and repair it from the viewpoint of safety. On the other hand, the actual situation is a malfunction of protective equipment,
For example, it may be a momentary electric leakage accident or an electric leakage under specific conditions while a specific load is operating for a short time.
In many cases, it takes a long time to find out the cause or the cause is unknown, and there is no suitable measuring device that has been put to practical use.

Therefore, the required functions are: i) Level of leakage current in a specific time interval in a normal state ii) Level of leakage current in a time zone when the protective device operates iii) Maximum leakage current value in a specific time interval And the time of occurrence.

iv) There is the duration of the maximum leakage current value for each specific time interval.

Means for Solving the Problems The leakage current recording apparatus of the present invention comprises a leakage current detection unit, a leakage current time limit detection unit, a maximum current value update memory unit, a time addition table for a plurality of current sections, a clock / calendar unit and a recording unit. However, the recording unit is provided with means for recording the maximum value of the leakage current, the date of occurrence, the time, and the duration of the maximum current at regular time intervals.

Function In the above configuration, the leakage current is continuously sampled and even if it is an instantaneous value, it is not leaked, and the level and the time period are measured by the leakage current detection unit. The level is stored in the maximum current value update memory and the time data is stored. Is added for each current section in the current section time addition table and records the end data at each fixed time interval.

Example An example of the present invention will be described below with reference to FIG. In the figure, reference numeral 1 is a leakage current sensor for detecting the leakage current of an AC circuit, and its output is given to a leakage current detection unit 2 for continuous sampling, amplification, DC conversion and A / D conversion.
The converted maximum value memory unit 4 and the leakage current time limit detection unit 3 are adapted to update the maximum value of the leakage current within the time period by a signal of the clock / calendar unit 6 at fixed time intervals each time sampling is performed. Same as above, measuring the time period that continues for each sampling time corresponding to the input, and adding the measured data to the time range of multiple current divisions in which the current range is divided into the number of magnitudes required for data analysis according to the level. It is put in the table 5, and here, data belonging to the same current section is added every sampling. Then, the same data is output at regular time intervals, and the maximum value of the leakage current and the continuation time from the time addition table to which the same occurrence time and the maximum value current belong are displayed and recorded on the display unit 7 and the recording unit 8.

Effects of the Invention As described above, according to the present invention, the following effects are achieved.

i) Since the maximum value of leakage current is recorded at fixed time intervals, data analysis can be performed while comparing it with the operating state of the load.
It is possible to provide powerful data for identifying the leakage point.

ii) Same as above Since the duration of the current is set as the time limit within the specific current range, the actual leakage current fluctuates considerably,
It is possible to provide data that is close to analog continuous data.

iii) Since the recorded data provides the data calculated and aggregated at fixed time intervals, the analog continuous data becomes a considerable amount when it is long-term data, but the recorded amount is small and the data is easy to see and It is easy to organize.

[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. 1 ... Leakage current sensor, 2 ... Leakage current detector, 3 ...
... Leakage current time limit detector, 4 ... Maximum current value memory, 5
…… Time addition table, 6 …… Clock / calendar section, 7
…… Display section, 8 …… Recording section.

Front Page Continuation (72) Inventor Makoto Yanagiba 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. ) Reference JP-A-56-84516 (JP, A) JP-A-62-220813 (JP, A) Actual opening Sho-58-47169 (JP, U) Actual opening Sho-59-34366 (JP, U)

Claims (1)

(57) [Claims] 1. A device for continuously sampling and measuring and recording a leak current, wherein a leak current detector for inputting a leak current detected by a leak current sensor, a leak current time limit detector, a maximum current value and It consists of memory of time of occurrence, time addition table of multiple current divisions, clock / calendar and recording unit, and the recording unit is programmed to record at fixed time intervals and the maximum leakage current at fixed time intervals. A leakage current recording device that records a value, its generation date and time, and records the timed addition table data of the current category to which the maximum leakage current belongs within a fixed time interval as the duration of the maximum leakage current value.