CN206804782U - A kind of family table wiring detecting system - Google Patents

Abstract

The utility model discloses a household meter wiring detection system, which comprises a power supply circuit, a voltage and current test circuit, a control unit and a display. Including resistance R0, power supply and voltage stabilizing circuit connected in series in sequence, and at least one predetermined resistance Rx is set in series between the live line of the user side and the neutral line of the user side, so that a DC loop is formed between the user side and the outgoing line of the ammeter, and the voltage and current The test circuit is connected in parallel with the power supply circuit and is also connected in series between the live wire of the electric meter outlet and the neutral wire of the electric meter outlet. The voltage and current test circuit will calculate the resistance value of the resistance Rx and send it to the control unit after conversion; The resistance value of Rx is used to judge the line short connection, wrong connection, open circuit or reverse connection, and the judgment result is displayed on the display.

Description

A household meter wiring detection system

technical field

The utility model relates to the field of electric power detection, in particular to a household meter wiring detection system.

Background technique

The correct wiring of smart household meters plays an important role in the use of household meters and data collection, and is the most basic link in the use of household meters. The correct wiring of the smart household meter is directly related to the stability of the grid operation and the stability and reliability of the user's electricity consumption. In residential buildings, due to the large number of lines and complex on-site conditions, it may lead to wrong wiring of smart household meters. After wiring, it is difficult to judge whether the wiring is correct. It takes a lot of time and energy to manually check each household, which greatly reduces the work efficiency of on-site personnel. . At present, in the face of a large number of new and rotating users, the workload of field personnel has increased significantly, and the investigation work is facing huge challenges. Today, as power facilities are becoming more and more intelligent, the wrong connection of smart household meter lines has a great impact on the data collection of household meter information, which increases the workload of power meter installation and connection and operation and maintenance departments, so the development of a smart Detecting household meter miswiring equipment plays an important role.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art. The purpose is to provide a household meter wiring detection system to solve the time-consuming and labor-intensive problem of manually testing whether the smart household meter is connected correctly.

The utility model is realized through the following technical solutions:

A household meter wiring detection system, including a power supply circuit, a voltage and current test circuit, a control unit and a display, a power supply circuit is connected in series between the live wire of the meter outlet and the neutral wire of the meter outlet, and the power supply circuit includes resistors connected in series R0, power supply and voltage stabilizing circuit, and at least one predetermined resistance Rx is set in series between the live wire of the user side and the neutral wire of the user side, so that a DC loop is formed between the user side and the outgoing line of the ammeter, and the voltage and current test circuit is powered by the power supply The parallel connection of the circuit is also connected in series between the live wire of the electric meter outlet and the neutral wire of the electric meter outlet. The voltage and current test circuit will calculate the resistance value of the resistor Rx after conversion and send it to the control unit; Line short circuit, wrong connection, open circuit or reverse connection judgment, and the judgment result is displayed on the display.

Further, there are 1-16 resistors Rx, each resistor Rx has a different resistance value, and each resistor Rx is connected to a circuit control relay.

Further, a diode is connected in series with the resistor Rx so as to judge the forward and reverse direction of the connection.

Further, the power supply uses a 12V lithium battery.

Further, the control unit adopts msm8953 model CPU.

Further, it also includes an RS-232 communication interface to realize data communication with a computer.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

A household meter wiring detection system, with intelligent detection and intelligent analysis functions, can quickly detect wrong wiring, and more clearly find wrong wiring problems. Save a lot of time and energy. The equipment is small and portable, and can be carried and operated independently by a single person, saving manual labor. The detection efficiency of on-site staff has been greatly improved. The test system can complete the test without electrification of the line.

Description of drawings

The drawings described here are used to provide a further understanding of the embodiments of the utility model, constitute a part of the application, and do not constitute a limitation to the embodiments of the utility model. In the attached picture:

Fig. 1 is a schematic structural diagram of a household meter wiring detection system of the present invention;

Fig. 2 is a structural schematic diagram of detecting multiple household meters by a household meter wiring detection system of the present invention;

Fig. 3 is the schematic diagram of the circuit principle of the utility model voltage and current test circuit;

Fig. 4 is the schematic diagram of the circuit principle of the utility model voltage stabilizing circuit;

Marks and corresponding parts names in the attached drawings:

1-power supply circuit, 2-voltage and current test circuit, 3-control unit, 4-display, 5-resistor R0, 6-power supply, 7-stabilizing circuit, 8-resistor Rx, 9-relay, 10-diode.

detailed description

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the examples and accompanying drawings. The schematic implementation of the utility model and its description are only used to explain the utility model Novelty, not as a limitation to the utility model.

Example

As shown in Figure 1-2, the utility model is a household meter wiring detection system, which includes a power supply circuit 1, a voltage and current test circuit 2, a control unit 3 and a display 4, which are connected in series between the live wire of the meter outlet and the neutral wire of the meter outlet There is a power supply circuit 1, the power supply circuit 1 includes a resistor R05, a power supply 6 and a voltage stabilizing circuit 7 connected in series in sequence, and at least one predetermined resistor Rx8 is set in series between the live wire on the user side and the neutral wire on the user side, so that the user side and the meter A DC loop is formed between the outgoing lines, and the voltage and current test circuit 2 is connected in parallel with the power supply circuit 1 and also connected in series between the live wire of the electric meter outgoing line and the neutral line of the electric meter outgoing line, and the voltage and current test circuit 2 will calculate the resistance of the resistor Rx8 The value is sent to the control unit 3 after A/D conversion; the control unit 3 judges the line short connection, wrong connection, open circuit or reverse connection according to the resistance value of the resistor Rx8, and displays the judgment result through the display 4. The control unit 3 can adopt the msm8953 model CPU. A household meter connection detection system also includes an RS-232 communication interface to realize data communication with a computer. The RS-232 communication interface is connected with the control unit 3 .

There are 1-16 resistors Rx8, each resistor Rx8 has a different set resistance value, and each resistor Rx8 is connected to a circuit to control the relay 9 .

As shown in Figure 3, the voltage and current test circuit 2 uses the 89S51 single-chip microcomputer combined with the A/D conversion chip ADC0832 to construct a DC voltage digital meter; the measured voltage is converted into a signal amplitude by the receiving range of the A/D through the operational amplifier circuit and converted The digital signal can be directly processed and saved by the 89S51 single-chip microcomputer. The resistor Rx8 is connected in series with a diode 10 to determine the forward and reverse direction of the connection. The power supply 6 adopts a 12V lithium battery.

A household meter wiring detection system of the utility model utilizes a lithium battery, and 16 groups of relays, is controlled by a CPU unit (control unit 3), respectively adds a stable DC voltage between the live wire and the zero wire on the outlet side of the 16 groups of electric meters, and A resistor with a stable resistance value (R0 in Figure 1), and a resistor set in advance by the host (Rx in Figure 1, 16 households have different resistance values) between the live wire and the neutral wire on the user side, so that A DC loop is formed between the user side and the outlet of the ammeter, and by testing the voltage on Rx, using the voltage divider between R0 and Rx, the resistance of Rx is calculated to determine whether the wiring is correct.

Power supply circuit: use 12V lithium battery to supply power, step down the input voltage, and then rectify it with a single-phase bridge diode. into a smoother DC voltage.

As shown in Figure 4, the voltage stabilizing circuit 7 is composed of a voltage stabilizing tube and a triode. The voltage of the voltage stabilizing tube D1 is used as the reference voltage of the triode Q1. The circuit introduces voltage negative feedback. When the grid voltage fluctuates, the voltage across R2 increases. (decrease), the emitter potential of the transistor will increase (decrease), and the voltage at the end of the Zener tube will basically remain unchanged, so the base potential will remain unchanged, so it can be seen that the base current will decrease (increase) And the decrease (increase) of the emitter current makes the voltage across R decrease (increase), so as to achieve the effect of voltage stabilization.

Voltage and current test module: use 89S51 single-chip microcomputer combined with A/D conversion chip ADC0832 to build a DC voltage digital meter; the measured voltage is converted into a suitable range of signal amplitude through an operational amplifier circuit, so that it can be converted by the receiving range of the A/D The digital signal can be directly processed and saved by the single-chip microcomputer.

16 relays are used to control one by one, and the voltage test and storage are performed on the resistance Rx8 on the user side of each group. After the voltage test, the signal is handed over to the data processing module. After calculation and comparison, the resistance value of the resistor Rx8 placed in the user's home is calculated; thus, it is judged whether the resistance value corresponds to the pre-designed resistance value, and then the circuit is short-circuited, wrong For example, if the calculated resistance value of room i matches the design resistance value of room j, and the calculated resistance value of room j matches the design resistance value of room i, then the line is wrongly connected; If the resistance value is infinite, the line will be disconnected; if the calculated resistance value is tens of kilohms but not infinite, then the line will be reversed; at the same time, the test data of each household will be stored; resistor Rx (8) resistors with different resistance values, and diodes in series , so as to judge the forward and reverse direction of the wiring.

The purpose, technical solutions and beneficial effects of the present utility model are further described in detail. It should be understood that the above description is only a specific embodiment of the present utility model, and is not used to limit the protection scope of the present utility model. Within the spirit and principles of the present utility model, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present utility model.

Claims (6)

1. A household meter wiring detection system, comprising a power supply circuit (1), a voltage and current test circuit (2), a control unit (3) and a display (4), is characterized in that: the outgoing line live wire of the electric meter and the neutral line of the electric meter outgoing line There is a power supply circuit (1) in series between them, and the power supply circuit (1) includes a resistor R0 (5), a power supply (6) and a voltage stabilizing circuit (7) connected in series in sequence, and then the live wire on the user side and the neutral wire on the user side At least one predetermined resistance Rx (8) is set in series between the lines, so that a DC loop is formed between the user side and the outlet of the ammeter, and the voltage and current test circuit (2) is connected in parallel with the power supply circuit (1) and also connected in series with the outlet of the ammeter Between the live wire and the neutral wire of the ammeter outlet, the voltage and current test circuit (2) will calculate the resistance value of the resistor Rx (8) and send it to the control unit (3) after conversion; the control unit (3) according to the resistance Rx The resistance value of (8) is used to judge the line short connection, wrong connection, open circuit or reverse connection, and the judgment result is displayed through the display (4). 2. A kind of household meter wiring detection system according to claim 1, is characterized in that: described resistance Rx (8) is 1-16, and each resistance Rx (8) setting resistance value is all different, each Each resistor Rx (8) is connected to a circuit control relay (9). 3 . The household meter wiring detection system according to claim 1 , characterized in that: said resistor Rx ( 8 ) is connected in series with a diode ( 10 ) so as to determine the positive and negative direction of the wiring. 4 . 4. A household meter wiring detection system according to claim 1, characterized in that: said power supply (6) is a 12V lithium battery. 5. A household meter wiring detection system according to claim 1, characterized in that: said control unit (3) adopts msm8953 model CPU. 6. A household meter wiring detection system according to claim 1, characterized in that: it also includes an RS-232 communication interface to realize data communication with a computer.