CN203479949U - Electric leakage detection apparatus - Google Patents

Abstract

The utility model relates to a leakage detection device. The device includes a zero-sequence current transformer (LLH). The zero-sequence current transformer (LLH) is set on a three-phase line. The zero-sequence current transformer (LLH) ) through the operational amplifier to input the single-chip microcomputer (U3), and the single-chip microcomputer is connected with a display circuit and an indicator light. The electric leakage detection device of the utility model can record and save the electric leakage phenomenon.

Description

Leakage detection device

technical field

The utility model relates to a leakage detection device, in particular to a leakage detection device for detecting whether there is leakage phenomenon in a user's indoor electric circuit, and belongs to the technical field of electric power detection equipment.

Background technique

At present, in the vast rural areas, especially the households that use electricity are scattered, and the power wiring is often very complicated; at the same time, due to the phenomenon of a large number of households pulling cables privately, the wiring in their houses is complicated and prone to line leakage, and once leakage occurs , will cause tripping and power failure in the entire power supply area, affecting the normal power consumption of other households; however, because many leakages occur in a short period of time, when maintenance personnel come to overhaul, there is often no leakage at that time, so that the hidden danger of leakage cannot be solved. Get rid of it in time.

Contents of the invention

The purpose of the utility model is to overcome the above disadvantages and provide a leakage detection device capable of recording and saving leakage phenomena.

The purpose of this utility model is achieved as follows: a leakage detection device, the device includes a zero-sequence current transformer, the zero-sequence current transformer is set on the three-phase line, the zero-sequence current transformer obtained The signal is input to the single-chip microcomputer through the operational amplifier, and the single-chip microcomputer is connected with a display circuit and an indicator light.

In the leakage detection device of the utility model, one of the two output terminals of the zero-sequence current transformer is grounded, and the other output terminal is connected to the inverting input terminal of the operational amplifier 1 through a resistor, and the resistor, diode 1 and diode The two are connected in parallel with each other and are connected in parallel between the two output terminals of the zero-sequence current transformer, and the anode of the diode one is grounded, and the negative pole of the diode two is grounded, and the positive-phase input terminal of the operational amplifier one is grounded through a resistor, and the The inverting input terminal of the operational amplifier one is connected to the output terminal of the operational amplifier one through a resistor, the output terminal of the operational amplifier one is connected to the non-inverting input terminal of the operational amplifier two, and the inverting input terminal of the operational amplifier two is connected to The output end of the operational amplifier two, the output end of the operational amplifier two is connected to the single-chip microcomputer through a resistor, and the single-chip microcomputer is connected with a display circuit, an indicator light, a button one and a button two.

The leakage detection device of the utility model, the device also includes a power supply circuit, the power supply circuit includes a transformer, the primary of the transformer is connected between the zero line and the first live line of the three-phase line, and the secondary of the transformer is connected through the bridge Output high level after the type rectification circuit and voltage regulator.

Compared with the prior art, the beneficial effects of the utility model are:

The utility model can detect and record the leakage phenomenon in real time, which is convenient for the maintenance personnel to check to determine the electricity-consuming households with the leakage phenomenon, and helps to eliminate hidden dangers of leakage in time, thereby improving the overall safety performance of the entire power supply area.

Description of drawings

Fig. 1 is a circuit block diagram of a leakage detection device of the present invention.

Fig. 2 is a block diagram of the power supply circuit of the leakage detection device of the present invention.

Detailed ways

Referring to Fig. 1 and Fig. 2, the utility model relates to a leakage detection device, the device includes a zero-sequence current transformer LLH, the zero-sequence current transformer LLH is set on a three-phase line, and the zero-sequence current transformer LLH The signal obtained by the transformer LLH is input to the single-chip microcomputer U3 through the operational amplifier, and the single-chip microcomputer is connected with a display circuit and an indicator light;

Specifically, one of the two output terminals of the zero-sequence current transformer LLH is grounded, and the other output terminal is connected to the inverting input terminal of the operational amplifier-U1 through a resistor, and the resistor, diode-D1 and diode The two D2 are connected in parallel with each other and connected in parallel between the two output terminals of the zero-sequence current transformer LLH, and the anode of the diode one D1 is grounded, and the negative pole of the diode two D2 is grounded, and the positive phase input terminal of the operational amplifier one U1 is passed through The resistance is grounded, the inverting input terminal of the operational amplifier one U1 is connected to the output terminal of the operational amplifier one U1 through a resistor, the output terminal of the operational amplifier one U1 is connected to the non-inverting input terminal of the operational amplifier two U2, and the operation The inverting input terminal of the amplifier two U2 is connected to the output terminal of the operational amplifier two U2, and the output terminal of the operational amplifier two U2 is connected to the single-chip microcomputer U3 through a resistor, and the single-chip microcomputer U3 is connected with a display circuit U4, an indicator light LED1, a button One SB1 and two buttons SB2;

The device also includes a power supply circuit, the power supply circuit includes a transformer B1, the primary of the transformer B1 is connected between the neutral line of the three-phase line and a live line, and the secondary of the transformer B1 is passed through a bridge rectifier circuit and The voltage regulator U5 outputs a high level, which is used by active circuits such as single-chip microcomputers and operational amplifiers in the device.

When working, when the leakage phenomenon occurs, the zero-sequence current transformer LLH will be triggered to generate a signal, which is amplified by the operational amplifier and then input to the single-chip microcomputer U3, and then the single-chip microcomputer U3 displays an alarm through the indicator light and the display circuit; at the same time, The electric leakage record is recorded in the built-in memory of the single-chip microcomputer U3, so that when the maintenance personnel come to carry out maintenance, they can conveniently and accurately know whether the electric leakage has occurred in the user's home by calling the record in the single-chip microcomputer U3.

Claims (3)

1. A leakage detection device, characterized in that: the device includes a zero-sequence current transformer (LLH), the zero-sequence current transformer (LLH) is set on a three-phase line, and the zero-sequence current transformer The signal obtained by (LLH) is input to the single-chip microcomputer (U3) through the operational amplifier, and the single-chip microcomputer is connected with a display circuit and an indicator light. 2. A leakage detection device according to claim 1, characterized in that: one of the two output terminals of the zero-sequence current transformer (LLH) is grounded, and the other output terminal is connected to the operation after passing through a resistor The inverting input terminal of amplifier one (U1), resistor, diode one (D1) and diode two (D2) are connected in parallel with each other and connected in parallel between the two output terminals of the zero-sequence current transformer (LLH), and diode one The positive pole of (D1) is grounded, the negative pole of diode two (D2) is grounded, the positive phase input terminal of the operational amplifier one (U1) is grounded through a resistor, and the inverting input terminal of the operational amplifier one (U1) is connected through a resistor The output terminal of operational amplifier one (U1), the output terminal of operational amplifier one (U1) is connected to the non-inverting input terminal of operational amplifier two (U2), and the inverting input terminal of operational amplifier two (U2) is connected to The output terminal of the operational amplifier two (U2), the output terminal of the operational amplifier two (U2) is connected to the single-chip microcomputer (U3) through a resistor, and the single-chip microcomputer (U3) is connected with a display circuit (U4) and an indicator light (LED1) , button one (SB1) and button two (SB2). 3. A leakage detection device according to claim 1 or 2, characterized in that: the device also includes a power circuit, the power circuit includes a transformer (B1), and the primary of the transformer (B1) is connected to three Between the neutral line and the first live line of the phase line, the secondary of the transformer (B1) outputs a high level after passing through a bridge rectifier circuit and a voltage stabilizer (U5).

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