Wiring device of electric energy meter

Abstract

The invention belongs to the technical field of power equipment installation, and relates to an electric energy meter wiring device, which comprises a base, three groups of copper bars, a plurality of pressure sensors, a plurality of voltage comparison circuit boards and a plurality of LED indicating lamps, the three groups of copper bars are all installed on the base, the plurality of pressure sensors are embedded in the tips of the first group of copper bars and the second group of copper bars, and the plurality of voltage comparison circuit boards are connected with the plurality of LED indicating lamps. The pressure sensor is used for detecting a pressure value applied to the copper bar when screws are tightened; the plurality of voltage comparison circuit boards are mounted on the base, are electrically connected with the pressure sensors and are used for converting electric signals output by the pressure sensors into corresponding voltage values and comparing the voltage values with preset rated voltage; the plurality of LED indicating lamps are connected with the voltage comparison circuit board, and when the voltage value reaches or exceeds the rated voltage, the LED indicating lamps are turned on to prompt that the screw is tightened. Through linkage of the pressure sensor and the LED, real-time visual feedback of the fastening state of the screw is achieved, and the hidden danger of virtual connection is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of power equipment installation, and particularly relates to a wiring device for an electric energy meter. Background Art

[0002] In the field of power metering and monitoring, the traditional installation methods of electric energy meters, acquisition terminals, and anti-theft electricity connection boxes have significant technical defects. According to the requirements of DL / T 448 "Technical Management Regulations for Electric Energy Metering Devices", the above-mentioned devices need to complete electrical connections through independent wiring terminals. Specifically, the outgoing line of the electric energy meter needs to be connected to the voltage sampling terminal of the terminal device and the input port of the connection box respectively, and the terminal current sampling circuit also needs to be separately connected to the output terminal of the connection box. This discrete wiring mode results in at least 6 crimping operations in a single-phase system and more than 18 repeated operations in a three-phase system, causing three major technical bottlenecks: First, multi-level transfer significantly increases the risk of contact resistance variation. According to the test data of the IEEE 1588 standard, the probability of over-temperature rise exceeding the standard increases by 23% for each additional connection point; Second, the staggered wiring layout leads to confusion of phase markings, and the proportion of miswiring accidents caused thereby in actual operation and maintenance reaches 17.6%; Third, the redundant degree of the connecting cables between devices is too high. In a conventional installation scenario, the redundant length of the cables exceeds 1.2 meters, which not only violates the cable laying specification of GB / T 5023, but also causes a waste of more than 35% of the cabinet space. CN222070705U discloses a three-phase three-wire electric energy meter auxiliary wiring device, but it cannot achieve virtual connection detection. When installers connect wires to the wiring terminals of the wiring device, if the connecting parts such as bolts and nuts are not tightened sufficiently, or if inappropriate tools are not used for tightening operations, wiring loosening will occur, resulting in virtual connection phenomena. For example, when tightening screws, if a suitable torque wrench is not used, the tightening force of the screws may be insufficient, and with the passage of time and the vibration of the equipment during operation, the wiring is likely to loosen. Therefore, it is urgent to develop a special wiring device with optimized topological structure to fundamentally solve the reliability defects of multi-device collaborative connection and the low engineering implementation efficiency. Summary of the Invention

[0003] The purpose of the invention is to overcome the deficiencies of the prior art and provide a wiring device for an electric energy meter, which can achieve multi-device collaborative connection and avoid virtual connection hidden dangers at the same time.

[0004] The technical solution adopted by the invention to solve the technical problems is as follows:

[0005] The present invention provides a wiring device for an electric energy meter, comprising: a base, three groups of copper bars, a plurality of pressure sensors, a plurality of voltage comparison circuit boards and a plurality of LED indicators. The three groups of copper bars are all installed on the base. The first group of copper bars is used to connect the electric energy meter, the second group of copper bars is used to connect the electric energy consumption data acquisition terminal of the electric energy meter, and the third group of copper bars is used to connect the junction box. The plurality of pressure sensors are embedded at the tips of the first group of copper bars and the second group of copper bars, and are used to detect the pressure value applied to the copper bars when the screws are tightened. The plurality of voltage comparison circuit boards are installed on the base and are electrically connected to the pressure sensors, and are used to convert the electrical signals output by the pressure sensors into corresponding voltage values and compare them with a preset rated voltage. The plurality of LED indicators are connected to the voltage comparison circuit boards and light up when the voltage value reaches or exceeds the rated voltage, indicating that the screws have been tightened.

[0006] Further, the pressure sensors are arranged at the tip parts where the copper bars contact the screws, and each copper bar tip is independently configured with a pressure sensor and a corresponding LED indicator to realize multi-pin independent detection.

[0007] Further, a voltage regulator is further included, which is installed on the base and is connected to each voltage comparison circuit board.

[0008] Further, the voltage regulator converts 220V alternating current into 5V direct current.

[0009] Further, the copper bars are of a hollow structure, and wires are arranged inside to connect the pressure sensors and the voltage comparison circuit boards.

[0010] Further, the screws are bolt or nut connectors, and their tightening torques are indirectly reflected by the pressure values of the pressure sensors.

[0011] Further, the rated voltage is preset according to the screw specifications and the material characteristics of the copper bars, and is used to determine whether the screws meet the tightening requirements.

[0012] The advantages and positive effects of the present invention are:

[0013] 1. Through the linkage of the pressure sensors and the LEDs, the present invention realizes real-time visual feedback of the screw tightening state and avoids the hidden danger of virtual connection.

[0014] 2. The multi-pin independent detection design of the present invention accurately locates the problem points and improves the installation efficiency.

[0015] 3. The present invention integrates a voltage regulation and signal processing module to ensure the detection accuracy and the stability of the device.

[0016] 4. The device of the present invention can shorten the on-site meter installation and wiring time and improve the process aesthetics. Description of the Drawings

[0017] Figure 1 Schematic diagram of the electricity meter wiring device provided by the present invention;

[0018] Figure 2 Schematic diagram of the connection between the electricity meter wiring device, the electricity meter, and the electricity consumption data acquisition terminal of the electricity meter;

[0019] Figure 3 Circuit diagram of the voltage comparison circuit board;

[0020] Figure 4 Circuit diagram of the voltage conversion of the voltage regulator.

[0021] In the figure: 1 is the base, 2 is the first group of copper bars, 3 is the second group of copper bars, 4 is the third group of copper bars, 5 is the voltage regulator, 6 is the pressure sensor, 7 is the LED indicator light, 8 is the voltage comparison circuit board, 9 is the electricity meter, 10 is the electricity consumption data acquisition terminal of the electricity meter, 11 is the electricity meter wiring device, and 12 is the junction box. Specific implementation manners

[0022] The present invention will be further described in detail below through specific embodiments. The following embodiments are only descriptive and not restrictive, and the protection scope of the present invention cannot be limited thereby.

[0023] As shown in Figure 1 the schematic diagram of the electricity meter wiring device provided by the present invention includes: a base 1, three groups of copper bars, a plurality of pressure sensors 6, a plurality of voltage comparison circuit boards 8, and a plurality of LED indicator lights 7. The three groups of copper bars are all installed on the base 1. The first group of copper bars 2 is used to connect the electricity meter 9, the second group of copper bars 3 is used to connect the electricity consumption data acquisition terminal 10 of the electricity meter, and the third group of copper bars 4 is used to connect the junction box 12.

[0024] A plurality of pressure sensors 6 are embedded at the tips of the first group of copper bars 2 and the second group of copper bars 3 for detecting the pressure value applied to the copper bars when the screws are tightened; a plurality of voltage comparison circuit boards 8 are installed on the base 1 and are electrically connected to the pressure sensors 6 for converting the electrical signals output by the pressure sensors 6 into corresponding voltage values and comparing them with a preset rated voltage; a plurality of LED indicator lights 7 are connected to the voltage comparison circuit boards 8 and light up when the voltage value reaches or exceeds the rated voltage to indicate that the screws have been tightened. As a preferred implementation manner, the pressure sensors 6 are arranged at the tip parts where the copper bars contact the screws, and each copper bar tip is independently provided with a pressure sensor 6 and a corresponding LED indicator light 7 to realize multi-pin independent detection.

[0025] During the process of inserting the copper bar into the power consumption data acquisition terminal 10 of the electricity meter and the electricity meter 9 and tightening the screws, the screws squeeze the tip of the copper bar. As the pressure increases, the electrical signal also becomes larger. The electrical signal is transmitted to the voltage comparison circuit board 8. The larger the electrical signal, the higher the voltage. When the voltage transmitted by the pressure sensor 6 is greater than or equal to the rated voltage, the LED lamp bead will light up, indicating that the screw has been tightened, thus effectively avoiding loose connections when the electricity meter wiring device 11 is connected to the metering box. As a preferred implementation manner, the rated voltage is preset according to the screw specifications and the material characteristics of the copper bar, and is used to determine whether the screw meets the tightening requirements.

[0026] Figure 3 The circuit diagram of the voltage comparison circuit board includes a pressure sensor H1, a resistor R2, a capacitor C3, a comparator U8, a variable resistor VR1, a current-limiting resistor R3, a light-emitting diode LED1, and a resistor R4. The first end of the pressure sensor H1 is connected to the ground, and the second end is connected to the resistor R2 to form a voltage-dividing circuit, converting the resistance change of the pressure sensor H1 into a voltage change. One end of the resistor R2 is connected to the +5V power supply. The capacitor C3 is connected in parallel across the pressure sensor H1 to filter out power supply noise and stabilize the voltage signal. The variable resistor VR1 is used as a reference voltage source. One end is connected to the +5V power supply, the other end is grounded, and the middle tap is used as the reference voltage input to the comparator U8. The comparator U8 uses an LM393DR2G chip. The current-limiting resistor R3 is connected between the +5V power supply and the light-emitting diode LED1 to limit the current flowing through the light-emitting diode LED1 and protect the light-emitting diode LED1. The anode of the light-emitting diode LED1 is connected to the +5V power supply through the current-limiting resistor R3, and the cathode is grounded through the resistor R4, which is used to indicate whether the pressure signal exceeds the threshold. The resistor R4 is connected from the cathode of the light-emitting diode LED1 to the ground to protect the light-emitting diode LED1 and form a discharge circuit. When pressure is applied to the pressure sensor H1, its resistance value decreases, which causes the voltage-dividing voltage between the pressure sensor H1 and the resistor R2 to rise. This voltage signal serves as the input signal IN / A of the comparator U8. The variable resistor VR1 is used to set the reference voltage IN / A / 2. When the IN / A voltage is higher than the reference voltage set by IN / A / 2, the comparator U8 outputs a high level, lighting up the light-emitting diode LED1. By adjusting the variable resistor VR1, the sensitivity of pressure detection can be changed.

[0027] This wiring device further includes a voltage regulator 5, which is installed on the base 1, and the voltage regulator 5 is connected to each voltage comparison circuit board 8. The voltage regulator 5 converts 220V alternating current into 5V direct current.

[0028] Figure 4It is a circuit diagram of a voltage regulator for voltage conversion, including a connector CN1, a fuse F1, a resistor R1, a capacitor C1, an inductor U5, a power supply module U7, and a capacitor C2. The connector CN1 is connected to an external power supply. The fuse F1 is in series at the input end. If the input current is too large, the fuse will blow to protect the circuit from damage. The resistor R1, the capacitor C1, and the inductor U5 form a filter to filter out the noise and interference in the input power supply to ensure that the alternating current entering the power supply module is clean. The power supply module U7 is an AC-DC conversion module that converts the filtered alternating current into direct current. The capacitor C2 is connected to the DC output end to filter and stabilize the voltage. It can absorb the voltage ripple and provide a smoother DC output.

[0029] As a preferred embodiment, the copper bar is of a hollow structure, and a wire is arranged inside to connect the pressure sensor 6 and the voltage comparison circuit board 8.

[0030] As a preferred embodiment, the screw is a bolt or nut connector, and its tightening torque is indirectly reflected by the pressure value of the pressure sensor 6.

[0031] When making on-site wiring, the upper end of the electric energy meter wiring device 11 is connected to the electric energy meter power consumption data acquisition terminal 10 and the electric energy meter 9 is powered on. The current flows through the copper bar through the voltage regulator 5. The voltage regulator 5 has the function of voltage transformation and stabilization, converting the incoming 220V AC voltage into a 5V DC voltage. The voltage regulator 5 is connected to each voltage comparison circuit board 8 of the copper bar; a pressure sensor 6 is built in above the tip of the copper bar. The pressure sensor 6 is connected to the copper bar, and a wire extends from the hollow copper bar to connect to the voltage comparison circuit board 8, and an LED lamp bead is connected to the voltage comparison circuit board 8. When installing the electric energy meter wiring device 11, the copper bar is inserted into the electric energy meter power consumption data acquisition terminal 10 and the electric energy meter 9, and then tightened with a screw. When tightening the screw, the screw becomes tighter and presses against the tip of the copper bar. The internal pressure sensor 6 senses the pressure and generates an electrical signal. As the pressure increases, the electrical signal also increases. The electrical signal is transmitted to the voltage comparison circuit board 8. The greater the electrical signal, the greater the voltage. At this time, the voltage needs to be compared with the 5V DC voltage converted by the voltage regulator 5. When the voltage transmitted from the pressure sensor 6 is greater than or equal to 5V, the LED lamp bead will light up, indicating that the screw has been tightened.

[0032] Specifically, it includes the following process:

[0033] S1: The upper end of the electric energy meter wiring device 11 is connected to the electric energy meter power consumption data acquisition terminal 10 and the electric energy meter 9 is powered on;

[0034] S2: The copper bar is inserted into the electric energy meter power consumption data acquisition terminal 10 and the electric energy meter 9 and connected to the electric energy meter wiring device 11;

[0035] S3: Tighten the screws in sequence to squeeze the pressure sensor 6 at the tip of the copper busbar;

[0036] S4: Observe whether the LED lamp beads of the corresponding tip pins are lit. If they are lit, it means that the screws of that pin have been tightened.

[0037] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the inventive concept, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention.

Claims

1. A wiring device for an electric energy meter, characterized in that, Comprising: a base (1), three groups of copper bars, all of the three groups of copper bars are installed on the base (1), the first group of copper bars (2) is used to connect an electricity meter (9), the second group of copper bars (3) is used to connect an electricity consumption data acquisition terminal (10) of the electricity meter, and the third group of copper bars (4) is used to connect a junction box (12); a plurality of pressure sensors (6), embedded at the tips of the first group of copper bars (2) and the second group of copper bars (3), for detecting the pressure value applied to the copper bars when the screws are tightened; a plurality of voltage comparison circuit boards (8), installed on the base (1), electrically connected to the pressure sensors (6), for converting the electrical signals output by the pressure sensors (6) into corresponding voltage values and comparing them with a preset rated voltage; LED indicators (7), connected to the voltage comparison circuit boards (8), which light up when the voltage value reaches or exceeds the rated voltage, indicating that the screws have been tightened.

2. The wiring device of the electric energy meter according to claim 1, characterized in that, The pressure sensors (6) are arranged at the tip parts where the copper bars are in contact with the screws, and each copper bar tip is independently configured with a pressure sensor (6) and a corresponding LED indicator (7) to achieve multi-pin independent detection.

3. The wiring device for an electric energy meter according to claim 1, wherein It further includes a voltage regulator (5), installed on the base (1), and the voltage regulator (5) is connected to each voltage comparison circuit board (8).

4. The wiring device of the electric energy meter according to claim 3, characterized in that The voltage regulator (5) converts 220V alternating current into 5V direct current.

5. The wiring device for an electric energy meter according to claim 1, characterized in that, The copper bars are of a hollow structure, and wires are arranged inside to connect the pressure sensors (6) and the voltage comparison circuit boards (8).

6. The wiring device for an electric energy meter according to claim 1, wherein, The screws are bolt or nut connectors, and their tightening torques are indirectly reflected by the pressure values of the pressure sensors (6).

7. The wiring device of the electric energy meter according to claim 1, characterized in that, The rated voltage is preset according to the screw specifications and the material characteristics of the copper bars, and is used to determine whether the screws meet the tightening requirements.

8. The wiring device of the electric energy meter according to claim 1, characterized in that The voltage comparison circuit board (8) includes a pressure sensor H1, a resistor R2, a capacitor C3, a comparator U8, a variable resistor VR1, a current-limiting resistor R3, a light-emitting diode LED1 and a resistor R4; The first end of the pressure sensor H1 is connected to the ground, and the second end is connected to the resistor R2 to form a voltage-dividing circuit, converting the resistance change of the pressure sensor H1 into a voltage change, and one end of the resistor R2 is connected to the +5V power supply; The capacitor C3 is connected in parallel across the pressure sensor H1 to filter out power supply noise and stabilize the voltage signal; The variable resistor VR1 is used as a reference voltage source, one end of which is connected to the +5V power supply, the other end is grounded, and the center tap is used as the reference voltage input to the comparator U8, The current-limiting resistor R3 is connected between the +5V power supply and the light-emitting diode LED1 to limit the current flowing through the light-emitting diode LED1 and protect the light-emitting diode LED1, The anode of the light-emitting diode LED1 is connected to the +5V power supply through the current-limiting resistor R3, and the cathode is grounded through the resistor R4 to indicate whether the pressure signal exceeds the threshold; The resistor R4 is connected between the cathode of the light-emitting diode LED1 and the ground to protect the light-emitting diode LED1 and form a discharge loop; When pressure is applied to the pressure sensor H1, its resistance value decreases, which causes the voltage division voltage between the pressure sensor H1 and the resistor R2 to rise. This voltage signal serves as the input signal IN / A of the comparator U8. The adjustable resistor VR1 is used to set the reference voltage IN / A / 2. When the IN / A voltage is higher than the set reference voltage of IN / A / 2, the comparator U8 outputs a high level, turning on the light-emitting diode LED1. By adjusting the adjustable resistor VR1, the sensitivity of pressure detection can be changed.

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