JPH0741690U - Earth leakage alarm - Google Patents

Abstract

(57) [Summary] [Purpose] To make it possible to easily determine the amount of leakage in the circuit to be monitored in a leakage alarm even in a dark place. [Configuration] As the weak voltage level detected by the zero-phase current transformer 3 increases, the arranged display lamps 22a to 22a.
It is configured to include the leakage amount display unit 22 that increases the number of lights 22d. In the preferred embodiment, the display lamp 2 is used.
2a to 22d are divided into a safety area and a dangerous area and are color-coded.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a leakage alarm device configured to display the amount of leakage by increasing the number of lighting of display lamps.

[0002]

[Prior art]

 This type of leakage alarm is configured to detect a weak voltage with a zero-phase current transformer, amplify the detected weak voltage, and display the amount of leakage with an electric indicator (analog meter). ing. FIG. 4 shows an external configuration of such an earth leakage alarm device. An alarm lamp 101 capable of entering a circuit name to monitor the earth leakage is provided at an appropriate place of a main body 100 mounted on a wall or the like, and a display sensitivity changeover switch is provided. 102, a power supply indicator light 103 for detecting whether or not the power is turned on, an operation confirmation light 104 for lighting and holding when a leakage current is detected, and an electric indicator instrument 105 for displaying the amount of leakage in analog by a pointer. Has become. Reference numeral 106 is a test switch for conducting a continuity test of the current transformer, and 107 is a return switch for releasing the lighting of the operation confirmation lamp 104. However, with such a configuration, it is troublesome to read the pointer of the electric indicator one by one, and it is difficult to read the pointer when it is placed in a dark place.

[0003]

[Problems to be solved by the device]

 The present invention has been made in view of such circumstances, and an object thereof is to provide an earth leakage warning device configured to easily read the amount of earth leakage even in a dark place.

[0004]

[Action]

 According to the present invention, as the leakage amount increases, the number of lighting of the indicator lamps of the leakage amount display section configured by arranging the indicator lamps in series increases, so that the leakage amount can be checked only by visually observing the leakage amount display section. Can be determined.

[0005]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows the configuration of the internal circuit of the leakage alarm device A of the present invention. The reception processing unit 1 is a combination of an amplifier circuit 11, a determination circuit 12 and an alarm circuit 13, a voltage determination circuit 21 and a leakage display. The display processing unit 2 is a combination of the units 22. Further, in this embodiment, the display lamp of the leakage amount display section 22 is constituted by the light emitting diode, but other lamps may be used (claim 3).

To explain the basic operation, when a voltage is detected by a leakage current by a current transformer 3 provided in a circuit to be monitored, the amplifier circuit 11 amplifies the voltage to a predetermined level, and the amplified signal is judged. It is sent to the circuit 12 and is compared and discriminated with a preset danger level. When the amount of leakage determined by the amplifier circuit 11 reaches a dangerous level, the alarm circuit 13 is activated to issue an alarm, and at the same time, the alarm lamp is turned on. On the other hand, the voltage corresponding to the leakage current amplified by the amplifier circuit 11 is sent to the voltage determination circuit 21, where it is determined whether it is a safe level or a dangerous level, and the leakage amount display section is determined according to the level. The display lamps such as light emitting diodes provided on the display 22 are increased / decreased and displayed.

FIG. 2 shows the leakage amount display unit 22 in more detail, and is configured to receive a determination signal from the voltage determination circuit 21 and drive and control a driver IC 22e having four light emitting diodes. . In the leakage amount display unit 22 as described above, when the determination circuit 12 determines that the voltage level for the leakage current amplified to a predetermined level by the amplifier circuit 11 is in the safe region, the voltage level is 2 When the light emitting diodes 22a, 22b are sequentially increased in lighting and it is determined that the danger area is present, the other two light emitting diodes 22c, 22c, in addition to the two light emitting diodes 22a, 22b which are turned on when the safety area is determined. 22d is also gradually turned on. Therefore, when the leakage amount is in the safe area, the two light emitting diodes 22a and 22b increase the number of lights in accordance with the detected leakage amount. The light emitting diodes 23c and 23d are also sequentially turned on. In this case, if the light emitting diodes 23a and 23b that are turned on when determining the safety area are colored green and the light emitting diodes 23c and 23d that are additionally turned on when determining the dangerous area are colored red, the color of the display unit 22 is By visually recognizing, it is possible to determine whether the vehicle is in the safe area or the dangerous area at a glance (Claim 2).

FIG. 3 shows an example of the appearance of the earth leakage alarm device A of the present invention. The main body 4 mounted on the wall is provided with an alarm lamp 41 capable of entering the name of the circuit for which the earth leakage should be monitored, and the display sensitivity is switched. In addition to the switch 42, a power supply indicator light 43 for detecting whether or not the power is turned on, an operation confirmation light 44 for lighting and holding when a leakage current is detected, a leakage amount display unit 22 is provided. Reference numeral 45 is a test switch for conducting a continuity test of the current transformer, and 46 is a return switch for canceling the lighting of the operation confirmation lamp 44. Here, the leakage amount display section 22 has two green areas indicating a safety area. The light emitting diodes 22a and 22b and the two light emitting diodes 22c and 22d for the red color indicating the dangerous area are combined to form four light emitting diodes.

[0009]

【effect】

 As described above, according to the present invention, as the leakage amount increases, the number of lighting of the indicator lamp of the leakage amount display unit increases, so that the leakage amount can be easily determined only by looking at the leakage amount display unit. Also, it is possible to provide a leak alarm that is easy to read even in the dark.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an internal circuit of a leakage alarm device of the present invention.

FIG. 2 is a configuration diagram of an internal circuit showing details of a leakage amount display unit.

FIG. 3 is an external view of a leak alarm of the present invention.

FIG. 4 is an external view of a conventional earth leakage alarm device.

[Explanation of symbols]

 A ... Leakage alarm device 1 ... Reception processing unit 11 ... Amplification circuit 12 ... Judgment circuit 13 ... Alarm circuit 2 ... Display processing unit 21 ... Voltage judgment circuit 22 ... ..Electric leakage display sections 22a to 22d ... Indicator lamps (light emitting diodes)

Claims (3)

[Scope of utility model registration request] 1. An earth leakage alarm device having a earth leakage amount display section for increasing the number of arranged display lamps lit as the weak voltage level detected by the zero-phase current transformer increases. 2. The earth leakage alarm device according to claim 1, wherein the earth leakage amount display portion is color-coded into a safety area of the earth leakage amount and a warning area. 3. The earth leakage alarm device according to claim 1, wherein the display lamp is composed of a light emitting diode.