JP2009254174A - Insulation monitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily confirm and change the measured value and detected value of leak currents, etc. without using a conventional maintenance tool. <P>SOLUTION: The monitor having a computer configured digitally processing means includes: a numerical indicator 10 that can display a channel display and the measured value or set value of the leak current; a push button 20 composed of a first push button that selects the set value and a second push button that decides the selected set value when an ON operation is executed; a rotary switch 30 composed of a first rotary switch that selects individual settings and the entire settings of each channel with figure settings and a second rotary switch that shifts the display of a figure indicator into the measured value and set value of the leak current; and an insulation monitoring processing means that shifts the figures for confirming and changing the measured value and set value of the leak current into the numerical indicator and decides them in response to combinations of push button and rotary switch operations. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an insulation monitoring device that monitors insulation for each channel by comparing a measured value and a set value of a zero-phase current at an insulation monitoring site of a low-voltage electrical facility, and in particular, a measured value of leakage current and various detected values (set values). ).

  As shown in FIG. 7, this type of insulation monitoring device is used for low-voltage electrical equipment composed of 100 V, 200 V lamp circuit, 200 V, 400 V power circuit, etc. Monitor leakage (insulation deterioration) by measurement.

FIG. 8 shows a configuration of a conventional monitoring device having a leakage current monitoring function (see, for example, Patent Document 1). In the figure, a measurement output unit 2 is provided in addition to the opening / closing control unit 1 which is a function as an original circuit breaker. In this measurement output unit 2, the current passed through the circuit breaker, the voltage measurement circuit unit and the leakage current measurement circuit unit 3, and from these measurement values, the current value, voltage value, leakage current value, power value, power amount value, A CPU unit 4 that calculates a power factor value, a display unit 5 that displays various measurement values, and a communication I / F unit 6 that converts the measurement values into output signals and sends them to a host device.
JP-A-2005-304148

  The measurement output unit 2 of the monitoring device shown in FIG. 8 automatically calculates the leakage current value from the current taken from the clamp CT (see FIG. 7) attached to the electric circuit such as a low voltage circuit or equipment, and provides various measured values. The display unit 5 has a function of displaying. The communication I / F unit 6 can notify leakage information to a higher-level device such as an administrator via a wireless network such as a third generation mobile phone network.

  When checking the leakage current value and setting value (setting value) measured by such a monitoring terminal, and when performing maintenance inspection such as changing the setting value, the administrator brings a maintenance tool to the site, A maintenance tool can be connected to the communication I / F unit 6 of the measurement output unit 2 for confirmation or change.

  However, since the maintenance tool is used by connecting a personal computer to the monitoring device, it is necessary to bring the personal computer to the site, which is troublesome.

  It is an object of the present invention to provide an insulation monitoring device that can easily perform measurement value check, detection value check / change, and the like of a leakage current without using a conventional maintenance tool.

  In order to solve the above-mentioned problems, the present invention constitutes a setting display device comprising a numeric display, a push button, a rotary switch, and a leakage monitoring processing means. It can check the measured value and check / change the detected value (setting value), and has the following configuration.

(1) In an insulation monitoring device comprising digital processing means having a computer configuration and monitoring insulation for each channel by comparing the measured value and the set value of the zero-phase current of the insulation monitoring part of the low-voltage electrical equipment.
A digital display means DO, a numeric display that can display the channel display and the measured or set value of leakage current;
A first push button for selecting a set value when the digital processing means DI is turned ON, and a second push button for determining the selected set value;
DI of digital processing means, a first rotary switch for selecting individual setting and overall setting of each channel by numerical setting, and a second rotary for switching the display of the numerical display to a measured value and a set value of leakage current A switch,
According to the combination of the push button and rotary switch operation, insulation monitoring processing means for switching and displaying and determining numerical values for the measurement value check and settling value confirmation / change of leakage current on the numeric display,
It is provided with.

(2) The numerical indicator, push button and rotary switch are integrally configured as a setting display device and mounted on an existing monitoring device,
The insulation monitoring processing means is characterized in that it is additionally mounted as software on the monitoring device.

  As described above, according to the present invention, a setting display device including a numeric display, a push button, a rotary switch, and a leakage monitoring processing unit is configured, and the measured value of the leakage current is obtained only by a combination operation of the push button and the rotary switch. Since confirmation and detection value (setting value) confirmation / change can be performed, the conventional maintenance tool is not required, and the measurement value confirmation, detection value confirmation / change, etc. of the leakage current can be easily performed.

  Specifically, the current monitoring device can check the measured value of leakage current, check / change the set value, etc., so there is no need for the administrator to bring a personal computer or measuring instrument to the site as in the past.

  In addition, since the function is realized by using inexpensive members such as a numeric display, a rotary switch, and a push button, the cost of the product can be greatly reduced.

  FIG. 1 is a monitoring device for a low-voltage electrical facility showing an embodiment of the present invention. This monitoring device basically converts various analog measurement signals acquired by an analog input unit into digital quantities, and monitors various electrical quantities by digital processing by a computer.

  The analog input unit takes in the transformation signals of the current transformers and transformers connected to each part of the low-voltage electrical equipment by the filter AF and the amplifier OPAMP. These analog signals are converted into digital signals by an MPX + A / D converter. The digital input unit takes in an external alarm signal or the like as a contact input by the DI circuit. The CPU is connected to a bus together with an MPX + A / D converter, a memory, a PLD (programmable controller), an expansion card, and the like to configure a computer, and various monitoring functions are realized by a software configuration. In addition, the CPU enables wireless communication with the host device via the communication module, and allows maintenance information to be input and output with the maintenance personal computer PC via the RS-232CI / F. .

The configuration described above is that of an existing monitoring device, and in this embodiment, an insulation monitoring function that enables confirmation of a leakage current measurement value, leakage leakage detection value (setting value) confirmation / change, etc. is added to the existing monitoring device. . In order to realize this insulation monitoring function, as hardware, data handled by the numeric display 10 that becomes DO, the push button 20 that becomes DI, and the rotary switch 30 that becomes DI can be input / output from the computer bus. In addition, a program for insulation monitoring processing by the CPU is added to the PLD or the like. Further, the zero-phase current I ₀ of the part to be monitored for insulation of the low-voltage electrical equipment is set as an analog input, and this is taken into the insulation monitoring process as digital data.

  FIG. 2 shows a configuration example of a setting display device in which the numeric display 10, the push button 20, and the rotary switch 30 are mounted integrally. The numeric display 10 is configured to display one or a plurality of numerical values by horizontally arranging four numeric displays of 7 segments. The push button 20 is composed of two push buttons 20A and 20B, the push button 20A selects the leakage detection value to be changed by turning it ON, and the push button 20B determines the leakage detection value to be selected and displayed. The rotary switch 30 is composed of two rotary switches 30A and 30B. The rotary switch 30A selects individual setting and overall setting of the channel to be set and displayed by the set numerical value, and the rotary switch 30B is “0”, “ “1” switches the display of the numeric display 10 between the measured value and the detected value of the leakage current.

  In the configuration of the setting display device of FIG. 2, a plurality of setting display functions A to I shown in FIG. 3 are realized by a combination operation of the push button 20 and the rotary switch 30. Details of the setting display function are described below.

  (Function A) When the rotary switch 30A is “0” and the rotary switch 30B is “0”, the CPU of the monitoring device is reset by turning on (pressing) the push button 20B.

  This function A is realized in steps (S1 to S6) in the processing flow shown in FIG. That is, the states of the rotary switches 30A and 30B are read (S1) and analyzed (S2). When the rotary switch 30B is “0” (S3), the state of the push button 20B is confirmed (S4). When in the “ON” state (pressed) (S5), device reset is executed (S6).

  (Function B) When the rotary switch 30A is “0” and the rotary switch 30B is “1”, “measurement / leakage current value display (collective)” is performed.

  This function B is realized in steps (S1 to S3, S7, S8) in the processing flow shown in FIG. That is, when the rotary switch 30B is not “0” and the rotary switch 30B is “1” (S7), measurement / leakage current value display is performed (S8).

  In this display, the leakage current values of all the CH (1 to 4) are switched by “CHNo,“ + ”***”. “CHNo” is flicker display, and each CH display is switched every 5 seconds, for example.

  An example of this display is shown in FIG. In the figure, when CH1: 200mA, CH2: 250mA, CH3: 300mA, CH4: 50mA, the channel is displayed on the numeric display at the top of the numeric display 10, and the current value (mA) is displayed on the remaining three digits. Each is switched at intervals of 5 seconds.

  (Function C) When the rotary switch 30A: “1” and the rotary switch 30B: “0”, the display target of “measurement / leakage current value display (each CH)” is displayed as the CH1 leakage current value.

  For example, when the measured current of CH1 is 200 mA, as shown in FIG. 5B, “200 mA” is displayed in the lower three digits of the numeric display 10 and the channel “1” is displayed in the first digit. Do not flicker.

  This function C is realized in steps (S11 to S14) in the processing flow shown in FIG. That is, the states of the rotary switches 30A and 30B are read (S11), analyzed (S12), and when the rotary switch 30B is “0” (S13), the CH1 measurement / leakage current value is displayed on the numeric display 10. Perform (S14).

  (Function D) When the rotary switch 30A: “1” and the rotary switch 30B: “1”, the display target of “measurement / leakage current value display (each CH)” is CH1, and the current leakage detection value is displayed.

  For example, when the leakage detection value of CH1 is 100 mA, “100 mA” is displayed in the lower three digits of the numeric display 10 and the channel “1” is displayed in the first digit as shown in FIG. And do not flicker.

  (Functions E and F) When the rotary switch 30A is “1”, the rotary switch 30B is “1”, and the push button 20A or 20B is turned on, the leakage detection value is changed, and this change is made to the push button 20A. When is pressed, the display of the leakage detection value of CH1 is selected, and when the push button 20B is pressed, the selected leakage detection value is determined.

  That is, (a) by pressing the push button 20A, the leakage detection value change mode is entered, and the leakage detection value display is flickered. (B) The leakage detection value is switched each time the push button 20A is further pressed. For example, as shown in FIG. 5D, the setting values are switched to 50 mA, 100 mA, 200 mA, and 400 mA. (C) The change of the leakage detection value is completed by pressing the push button 20B.

  These functions D and E are realized in steps (S15 to S22) in the processing flow shown in FIG. That is, when the rotary switch 30B is “1” (S15), the leakage detection value is displayed on the numeric display 10 (S16), the state of the push button 20A is confirmed (S17), and when it is pressed (S18). ) When it is the first time, the numeric display 10 is flickered, and after the second time, the display is switched (S19). Thereafter, the push button 20B is confirmed (S20), and when it is pressed (S21), the leakage detection value is determined (S22).

  The same processing is performed for the other channels CH2 to CH4. In these processes, as shown by the functions G, H, and I in FIG. 3, the channels CH2 to CH4 are processed while the rotary switch 30A is switched to the values “2” to “4”.

The monitoring apparatus of the low voltage | pressure electric equipment which shows embodiment of this invention. The structural example of a setting display apparatus. The figure of a setting display function. Processing flow (part 1). Display example. Processing flow (part 2). The structural example of an insulation monitoring apparatus. A conventional monitoring device with a leakage current monitoring function.

Explanation of symbols

10 Numeric display 20, 20A, 20B Push button 30, 30A, 30B Rotary switch

Claims (2)

In an insulation monitoring device comprising a digital processing means of a computer configuration and monitoring insulation for each channel by comparing the measured value and the set value of the zero-phase current of the insulation monitoring part of the low-voltage electrical equipment.
A digital display means DO, a numeric display that can display the channel display and the measured or set value of leakage current;
A first push button for selecting a set value when the digital processing means DI is turned ON, and a second push button for determining the selected set value;
DI of digital processing means, a first rotary switch for selecting individual setting and overall setting of each channel by numerical setting, and a second rotary for switching the display of the numerical display to a measured value and a set value of leakage current A switch,
According to the combination of the push button and rotary switch operation, insulation monitoring processing means for switching and displaying and determining numerical values for the measurement value check and settling value confirmation / change of leakage current on the numeric display,
An insulation monitoring device comprising: The numeric indicator, push button and rotary switch are integrated into a setting display device and mounted on an existing monitoring device,
The insulation monitoring apparatus according to claim 1, wherein the insulation monitoring processing unit is additionally installed as software on the monitoring apparatus.

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