JPH0512774Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a portable voltage detector checker for checking the operation of high and low voltage voltage detectors under conditions approximating practical conditions.

In recent years, as the use of covered wires in high-voltage distribution lines has expanded, voltage detection from above the covered wires has become common. For this reason, it has become necessary to check the voltage detection performance of voltage detectors more severely.

In view of the above, the present invention is applicable to both high-voltage and low-voltage voltage detectors, and is compact and compact.
The purpose is to provide a portable voltage detector checker that is inexpensive and convenient to carry.

First, an example of a portable voltage detector according to the present invention for checking operation will be briefly described with reference to FIG. In the figure, reference numeral 1 denotes a synthetic resin container constituting the main body of the electroscope, and an electrode 2 is provided at the tip and a sound generator 3 is provided at the rear end. The electrode 2 is a conductive metal body 2a, 2
b, and an insulator (for example, synthetic resin) 2c located between the metal body 2a at the tip.
It is configured so that a voltage is induced in the inner metal body 2b by electrostatic induction by bringing it into contact with a power distribution line that is energized. On the other hand, the inside of the container body 1 is formed into a cavity, and a detection and oscillation circuit 4 is provided behind the electrode 2. 5 is a light emitting diode provided on the substrate of the detection and oscillation circuit 4, and 6 is a battery.

When a voltage detector configured in this manner is to be put into practical use, first, the electrode 2 is brought into contact with a current-carrying power distribution line.
Then, the oscillation conditions for the detection and oscillation circuit 4 are established, and oscillation starts at a predetermined frequency. The light emitting diode 5 waits for the establishment of the oscillation conditions and starts flickering, and in synchronization with the flickering, the sound generator 3 sounds a voltage detection sound.
The circuit operation is designed to be applicable to both high and low voltage voltage detectors.

Next, an embodiment of the portable voltage detector checker of the present invention for checking the performance of the voltage detector shown in FIG. 1 will be described below. FIG. 2 is a block diagram showing the circuit configuration of the present invention. In the figure, 7 is a square wave oscillation circuit, which oscillates a 55 Hz square wave, for example. A band pass filter 8 converts the oscillation frequency of the square wave oscillation circuit 7 into a sine wave and performs waveform conversion approximating the commercial frequency. Reference numeral 9 denotes a voltage amplification circuit for amplifying the voltage of the waveform of the bandpass filter 8, and its output is further amplified by a power amplification circuit 10 to generate a high voltage via an output transformer circuit 11. Also 12
The battery voltage detection circuit of this portable voltage detector checker compares the reference voltage and battery voltage. 13 is a display circuit that operates when the battery voltage is lower than the reference voltage, and 14 is a power source.

Next, specific examples of the present invention will be described below. In FIG. 3, the same parts as in FIG. 2 are designated by the same symbols. OP ₁ to OP ₄ are amplifiers, Tr ₁ and Tr ₂ are transistors, T is a transformer, and E ₁ and E ₂ are batteries. , SW ₁ and SW ₂ are interlocking push button switches, ZD ₁ to ZD ₄ are Zener diodes,
LED is a light emitting diode, and H and L are electrode plates that output high voltage and low voltage.

Next, the operation will be explained. First, when checking the operating function of the electroscope illustrated in FIG. 1, the device body 1 is held directly by hand, and the electrode 2 is brought into contact with the electrode plate H or L in FIG. 3. Here, the H electrode plate outputs about 400V on the high voltage check side, and the other side outputs about 400V.
The output tap of the transformer T is designed so that a low voltage of about 90V is generated from the electrode plate. When the interlocking pushbutton switches SW ₁ and SW ₂ of the power supply 14 are turned on, the square wave oscillation circuit 7 immediately starts oscillating.
For example, it generates a square wave output signal of approximately 55Hz. The bandpass filter circuit 8 converts the output waveform of the square wave oscillation circuit 7 into a sine wave, while making only the output of a predetermined frequency valid and transmitting it to the voltage amplification circuit 9 in the subsequent stage, and subsequently transmits it to the voltage amplification circuit 9 at the subsequent stage. Power up. The powered-up sine wave voltage, which approximates the commercial frequency, is boosted by the output transformer circuit 11, and then a predetermined voltage is generated at each of the tap H and L terminals, so that the performance of the voltage detector in the conventional example shown in FIG. When checking, the voltage detector can be checked under conditions approximating actual conditions by bringing the electrode 2 of the voltage detector into contact with each of the taps H or L. On the other hand, battery voltage detection circuit 12
, the reference voltage given by the Zener diode ZD ₃ is compared with the battery voltage divided by the resistor, and when the battery voltage becomes lower than the reference voltage, the voltage applied to the output side of the operational amplifier OP ₄ is compared. The light emitting diode LED of the display circuit 13 is turned off.

As described above, according to the present invention, by using the portable voltage detector of the present invention, it is easy to check the functionality of high and low voltage voltage detectors, which are indispensable for electrical workers, under test conditions similar to actual conditions. Moreover, since the circuit structure is an integrated circuit structure driven by a battery, it has the excellent effect of providing a small, lightweight portable voltage detector at a low cost.

[Brief explanation of the drawing]

Figure 1 is an example of the configuration of a voltage detector to be tested by the voltage detector checker of this invention, Figure 2 is a block diagram of a portable voltage detector checker showing an embodiment of this invention, and Figure 3 is 3 is a specific circuit configuration diagram of FIG. 2. FIG. DESCRIPTION OF SYMBOLS 1... Container body, 2... Electrode, 3... Sound generator, 4... Detection and oscillation circuit, 5... Light emitting diode, 6... Battery, 7... Square wave oscillation circuit, 8...
...Band pass filter, 9...Voltage amplification circuit, 1
0... Power amplifier circuit, 11... Output transformer circuit, 12... Battery voltage detection circuit, 13... Display circuit.

Claims (1)

[Scope of utility model registration request] a square wave oscillation circuit that generates a square wave; a bandpass filter that converts the output waveform of the square wave oscillation circuit into a sine wave and converts the waveform to approximate a commercial frequency;
a voltage amplification circuit that amplifies the output signal of the bandpass filter; a power amplification circuit that amplifies the power of the output of the voltage amplification circuit; and a power amplification circuit that boosts the output of the power amplification circuit to output two types of voltages: high voltage and low voltage. A portable device comprising: an output transformer circuit that monitors the level of the power supply voltage supplied to each of the circuits, a voltage detection circuit that monitors the level of the power supply voltage supplied to each of the circuits, and a display circuit that displays that the level of the power supply voltage has fallen below a predetermined value. Electric detector checktsuka.