Uninterruptible power switching metering system for electric energy meter reloading

Abstract

The utility model provides an uninterruptible power switching metering system for reloading an electric energy meter. The uninterruptible power switching metering system comprises a transformer T1, a direct-current relay, a control unit and a detection trigger circuit, one end of a normally open switch K1 of the direct-current relay is connected to one end of a primary winding of the transformer T1, and the other end of the normally open switch K1 of the direct-current relay is provided with a first alligator clip which is used for being clamped on an input side connector of an electric meter; the other end of the primary winding of the transformer T1 is provided with a second alligator clip, and the alligator clip is used for being clamped on a home-entry wire connector of a user; the input end of the detection trigger circuit is connected to a secondary winding of the transformer T1, the detection trigger circuit is used for detecting voltage and current information of an ammeter reloading device and inputting the information to the control unit, and the detection trigger circuit is further used for outputting a timing trigger signal to the control unit when a normally open switch K1 of the direct-current relay is closed; the control unit is used for recording voltage and current of the ring-shaped device of the electric meter to count time information and uploading the time information, and the control unit is also used for controlling on and off of a normally open switch K1 of the direct-current relay.

Description

Technical Field

[0001] The utility model relates to an electric power auxiliary system, in particular to an electric energy meter replacement non-stop power transfer metering system. Background Art

[0002] When supplying electricity in the power system, the user's electricity consumption is measured through an electric meter, and then the corresponding fees are calculated. However, as the service time of the electric meter increases, it ages or even breaks down, and the electric meter needs to be replaced.

[0003] In the prior art, there are two ways to replace an electric meter: one is to replace the meter with power off, that is, to cut off the power supply to the user, and then restore the power supply after replacing the new meter. This method will have a serious impact on the user's electricity consumption. For example, if the user has some medical equipment that cannot be powered off, then there will be safety hazards to the user if the power is cut off to replace the meter. The other method is to replace the meter with power on, that is, to replace the meter without powering off. This method connects the user's input to the power supply side through an adapter cable, and then replaces the meter. If the user's electricity consumption is not billed during this period, it will cause losses to the power supply company. If it is billed, the billing rules are cumbersome and may even cause disputes between the supply and the user.

[0004] Therefore, in order to solve the above technical problems, it is urgent to propose a new technical means. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a metering system for non-interruption of power supply when replacing an electric energy meter, which does not require power off when replacing the user's electric meter and can perform effective electricity consumption statistics during the replacement process, thereby preventing disputes between the supplier and the user due to power off billing and ensuring the economic rights and interests of the power supply company.

[0006] The utility model provides an electric energy meter replacement non-stop power transfer metering system, comprising a transformer T1, a DC relay, a control unit and a detection trigger circuit;

[0007] One end of the normally open switch K1 of the DC relay is connected to one end of the primary winding of the transformer T1, and the other end of the normally open switch K1 of the DC relay is provided with a first crocodile clip, which is used to clamp the input side connector of the electric meter; the other end of the primary winding of the transformer T1 is provided with a second crocodile clip, which is used to clamp the user's household line connector;

[0008] The input end of the detection trigger circuit is connected to the secondary winding of the transformer T1, and is used to detect the voltage and current information of the meter replacement device and input it to the control unit, and the detection trigger circuit is also used to output a timing trigger signal to the control unit when the normally open switch K1 of the DC relay is closed; the control unit is used to record the voltage and current of the meter ring device to measure the time information and upload it, and the control unit is also used to control the closing and opening of the normally open switch K1 of the DC relay.

[0009] Further, the control unit includes a control chip, an analog-to-digital conversion circuit, a memory, a DC relay control circuit and a wireless communication module;

[0010] The controller is communicatively connected to the memory, the control output end of the control chip is connected to the control input end of the DC relay control circuit, the control chip is communicatively connected to the monitoring host via a wireless communication module, the input end of the control chip is connected to the output end of the analog-to-digital conversion circuit, the current detection input end and the voltage detection input end of the analog-to-digital conversion circuit are respectively connected to the current signal output end and the voltage signal output end of the detection trigger circuit, and the trigger signal input end of the control chip is connected to the timing trigger signal output end of the detection trigger circuit.

[0011] Further, the DC relay control circuit includes a lithium battery, a transistor Q1 and a diode D1;

[0012] The collector of the transistor Q1 is connected to the positive electrode of the lithium battery, the emitter of the transistor Q1 is connected to one end of the excitation coil J1 of the DC relay, the other end of the excitation coil J1 of the DC relay is grounded, the cathode of the diode D1 is connected to the base of the transistor Q1, and the anode of the diode D1 serves as the control input end of the DC relay control circuit.

[0013] Further, the detection trigger circuit includes a rectifier circuit REC1, a capacitor C1, a capacitor C2, a resistor R1, a trigger circuit and a current and voltage detection circuit;

[0014] The positive input terminal and the negative input terminal of the rectifier circuit REC1 are respectively connected to the two ends of the secondary winding of the transformer T1, the positive output terminal of the rectifier circuit REC1 is connected to one end of the resistor R1, the other end of the resistor R1 is grounded through the capacitor C2, the positive output terminal of the rectifier circuit REC1 is also grounded through the capacitor C1, the negative output terminal of the rectifier circuit REC1 is grounded, the input terminal of the trigger circuit is connected to the common connection point between the resistor R1 and the capacitor C1, the output terminal of the trigger circuit serves as the timing trigger signal output terminal of the detection trigger circuit, the voltage detection output terminal of the current and voltage detection circuit is connected to the voltage detection input terminal of the analog-to-digital conversion circuit, and the current detection output terminal of the current and voltage detection circuit is connected to the current detection input terminal of the analog-to-digital conversion circuit.

[0015] Further, the current and voltage detection circuit includes a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and an operational amplifier U1;

[0016] One end of the resistor R3 is connected to the common connection point between the resistor R1 and the capacitor C2 as the input end of the current and voltage detection circuit, the other end of the resistor R3 is grounded through the resistor R5, and the common connection point between the resistor R3 and the resistor R5 is used as the voltage detection output end Va / d of the current and voltage detection circuit, one end of the resistor R4 is connected to the common connection point between the resistor R3 and the resistor R5, the other end of the resistor R4 is grounded through the resistor R7, the common connection point between the resistor R4 and the resistor R7 is connected to the in-phase end of the operational amplifier U1, the inverting end of the operational amplifier U1 is connected to the common connection point between the resistor R5 and the ground through the resistor R6, the inverting end of the operational amplifier U1 is connected to the output end of the operational amplifier U1 through the resistor R8, and the output end of the operational amplifier U1 is used as the current detection output end Ia / d of the current and voltage detection circuit.

[0017] Further, the trigger circuit includes a resistor R2 and an optical coupler OC1;

[0018] One end of the resistor R2 is connected to the common connection point between the resistor R1 and the capacitor C1 as the input end of the trigger circuit, the other end of the resistor R2 is connected to the positive electrode of the light-emitting diode of the optocoupler OC1, the negative electrode of the light-emitting diode of the optocoupler OC1 is grounded, the collector of the phototransistor of the optocoupler OC1 is used as the timing trigger signal output end of the trigger circuit, and the emitter of the phototransistor of the optocoupler OC1 is grounded.

[0019] Furthermore, the wireless communication module is a 5G module.

[0020] The beneficial effects of the utility model are as follows: through the utility model, there is no need to cut off the power when replacing the user's electricity meter, and effective electricity consumption statistics can be performed during the replacement process, thereby preventing disputes between the supplier and the user due to power outage billing, and also ensuring the economic rights and interests of the power supply company. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0022] Figure 1 It is a schematic diagram of the structure of the utility model.

[0023] Figure 2 This is the principle diagram of the detection trigger circuit of the utility model. DETAILED DESCRIPTION

[0024] The utility model is further described in detail below:

[0025] The utility model provides an electric energy meter replacement non-stop power transfer metering system, comprising a transformer T1, a DC relay, a control unit and a detection trigger circuit;

[0026] One end of the normally open switch K1 of the DC relay is connected to one end of the primary winding of the transformer T1, and the other end of the normally open switch K1 of the DC relay is provided with a first crocodile clip, which is used to clamp the input side connector of the electric meter; the other end of the primary winding of the transformer T1 is provided with a second crocodile clip, which is used to clamp the user's household line connector;

[0027] The input end of the detection trigger circuit is connected to the secondary winding of the transformer T1, and is used to detect the voltage and current information of the meter replacement device and input it to the control unit, and the detection trigger circuit is also used to output a timing trigger signal to the control unit when the normally open switch K1 of the DC relay is closed; the control unit is used to record the voltage and current of the meter ring device to measure the time information and upload it, and the control unit is also used to control the closing and opening of the normally open switch K1 of the DC relay; through the above structure, there is no need to cut off the power when replacing the user's meter, and effective electricity consumption statistics can be performed during the replacement process, thereby preventing disputes between the supply and user due to power outage billing, and can also ensure the economic rights and interests of the power supply company.

[0028] The transformer T1 and the normally open switch K1 of the DC relay are arranged on the live wire of the power supply circuit.

[0029] In this embodiment, the control unit includes a control chip, an analog-to-digital conversion circuit, a memory, a DC relay control circuit and a wireless communication module;

[0030] The controller is connected to the memory for communication, the control output of the control chip is connected to the control input of the DC relay control circuit, the control chip is connected to the monitoring host for communication via a wireless communication module, the input of the control chip is connected to the output of the analog-to-digital conversion circuit, the current detection input and the voltage detection input of the analog-to-digital conversion circuit are respectively connected to the current signal output and the voltage signal output of the detection trigger circuit, and the trigger signal input of the control chip is connected to the timing trigger signal output of the detection trigger circuit; wherein the control chip adopts an existing single-chip microcomputer, such as an STM32 series single-chip microcomputer, and the analog-to-digital conversion circuit The existing dual-channel A / D conversion circuit is adopted. Of course, a command input device is also provided, such as a touch display, which is connected to the control chip. When the electric meter needs to be replaced, the first crocodile clip and the second crocodile clip mentioned above are clamped on the target connector. Of course, the whole system is also provided with a neutral wire crocodile clip. There are two neutral wire crocodile clips, which are respectively arranged at the two ends of the transfer neutral wire. The two neutral wire crocodile clips are respectively clamped on the connector of the household neutral wire on the user side and the zero point on the input side of the electric meter; then the corresponding control command is input to the control chip through the touch display, and the control chip controls the DC relay to attract, and then disconnects the electric meter to be replaced, so as to replace it.

[0031] In this embodiment, the DC relay control circuit includes a lithium battery, a transistor Q1 and a diode D1;

[0032] The collector of transistor Q1 is connected to the positive electrode of the lithium battery, the emitter of transistor Q1 is connected to one end of the excitation coil J1 of the DC relay, the other end of the excitation coil J1 of the DC relay is grounded, the cathode of diode D1 is connected to the base of transistor Q1, and the anode of diode D1 serves as the control input end of the DC relay control circuit. Of course, the lithium battery is also used to power the control chip, operational amplifier, and analog-to-digital conversion circuit. When supplying power, a corresponding voltage regulator chip is set. For example, if the rated voltage is 5V, the voltage regulator chip uses the LM7805 chip. The DC power of the lithium battery is processed by the voltage regulator chip and output to the corresponding electrical device. When the control chip outputs a high level, the transistor Q1 is turned on, and the excitation coil J1 of the DC relay generates suction to close the normally open switch K1. When the control chip outputs a low level, the transistor Q1 is turned off, and the normally open switch K1 changes from being closed to being open.

[0033] In this embodiment, the detection trigger circuit includes a rectifier circuit REC1, a capacitor C1, a capacitor C2, a resistor R1, a trigger circuit, and a current and voltage detection circuit;

[0034] The positive input terminal and the negative input terminal of the rectifier circuit REC1 are respectively connected to the two ends of the secondary winding of the transformer T1, the positive output terminal of the rectifier circuit REC1 is connected to one end of the resistor R1, the other end of the resistor R1 is grounded through the capacitor C2, the positive output terminal of the rectifier circuit REC1 is also grounded through the capacitor C1, the negative output terminal of the rectifier circuit REC1 is grounded, the input terminal of the trigger circuit is connected to the common connection point between the resistor R1 and the capacitor C1, the output terminal of the trigger circuit serves as the timing trigger signal output terminal of the detection trigger circuit, the voltage detection output terminal of the current and voltage detection circuit is connected to the voltage detection input terminal of the analog-to-digital conversion circuit, and the current detection output terminal of the current and voltage detection circuit is connected to the current detection input terminal of the analog-to-digital conversion circuit, wherein the rectifier circuit adopts a full-bridge rectifier circuit composed of diodes.

[0035] The current and voltage detection circuit includes a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and an operational amplifier U1;

[0036] One end of the resistor R3 is connected to the common connection point between the resistor R1 and the capacitor C2 as the input end of the current and voltage detection circuit, the other end of the resistor R3 is grounded through the resistor R5, and the common connection point between the resistor R3 and the resistor R5 is used as the voltage detection output terminal Va / d of the current and voltage detection circuit, one end of the resistor R4 is connected to the common connection point between the resistor R3 and the resistor R5, the other end of the resistor R4 is grounded through the resistor R7, the common connection point between the resistor R4 and the resistor R7 is connected to the in-phase end of the operational amplifier U1, the inverting end of the operational amplifier U1 is connected to the common connection point between the resistor R5 and the ground through the resistor R6, the inverting end of the operational amplifier U1 is connected to the output end of the operational amplifier U1 through the resistor R8, and the output end of the operational amplifier U1 is used as the current detection output end Ia / d of the current and voltage detection circuit. The operational amplifier U1, the resistor R4, the resistor R7, the resistor R8 and the resistor R6 constitute a current detection circuit, the resistor R5 and the resistor R3 constitute a voltage monitoring circuit, and the resistor R5 is a current detection resistor.

[0037] In this embodiment, the trigger circuit includes a resistor R2 and an optical coupler OC1;

[0038] One end of the resistor R2 is connected to the common connection point between the resistor R1 and the capacitor C1 as the input end of the trigger circuit, and the other end of the resistor R2 is connected to the positive electrode of the light-emitting diode of the optocoupler OC1. The negative electrode of the light-emitting diode of the optocoupler OC1 is grounded. The collector of the phototransistor of the optocoupler OC1 serves as the timing trigger signal output end of the trigger circuit, and the emitter of the phototransistor of the optocoupler OC1 is grounded. The control chip is used to identify the level of the collector of the phototransistor of the optocoupler OC1. When the switch K1 is energized, there is a voltage between the resistor R1 and the resistor R3, and the voltage turns on the optocoupler, so that the terminal connected to the phototransistor collector of the control chip and the optocoupler OC1 is pulled from a high level to a low level, which is a timing start trigger signal. When the replacement is completed and the switch K1 is disconnected, the optocoupler OC1 is restored to cutoff, and the corresponding pin of the control chip is restored to a high level, which is a timing termination trigger signal. The optocoupler is used to isolate the control chip from the front end, which plays a good protective role.

[0039] In this embodiment, the wireless communication module is a 5G module, which is convenient for timely uploading the voltage and current of the current user's changing process and the changing time, so as to facilitate billing.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A metering system for non-stop power transfer when replacing an electric energy meter, characterized in that: It includes a transformer T1, a DC relay, a control unit and a detection trigger circuit; One end of the normally open switch K1 of the DC relay is connected to one end of the primary winding of the transformer T1, and the other end of the normally open switch K1 of the DC relay is provided with a first crocodile clip, which is used to clamp the input side connector of the electric meter; the other end of the primary winding of the transformer T1 is provided with a second crocodile clip, which is used to clamp the user's household line connector; The input end of the detection trigger circuit is connected to the secondary winding of the transformer T1, and is used to detect the voltage and current information of the meter replacement device and input it to the control unit, and the detection trigger circuit is also used to output a timing trigger signal to the control unit when the normally open switch K1 of the DC relay is closed; the control unit is used to record the voltage and current of the meter ring device to measure the time information and upload it, and the control unit is also used to control the closing and opening of the normally open switch K1 of the DC relay.

2. The non-stop power transfer metering system for replacing electric energy meters according to claim 1 is characterized in that: The control unit includes a control chip, an analog-to-digital conversion circuit, a memory, a DC relay control circuit and a wireless communication module; The control chip is communicatively connected to the memory, the control output end of the control chip is connected to the control input end of the DC relay control circuit, the control chip is communicatively connected to the monitoring host via a wireless communication module, the input end of the control chip is connected to the output end of the analog-to-digital conversion circuit, the current detection input end and the voltage detection input end of the analog-to-digital conversion circuit are respectively connected to the current signal output end and the voltage signal output end of the detection trigger circuit, and the trigger signal input end of the control chip is connected to the timing trigger signal output end of the detection trigger circuit.

3. The non-stop power transfer metering system for replacing electric energy meters according to claim 2 is characterized in that: The DC relay control circuit includes a lithium battery, a transistor Q1 and a diode D1; The collector of the transistor Q1 is connected to the positive electrode of the lithium battery, the emitter of the transistor Q1 is connected to one end of the excitation coil J1 of the DC relay, the other end of the excitation coil J1 of the DC relay is grounded, the cathode of the diode D1 is connected to the base of the transistor Q1, and the anode of the diode D1 serves as the control input end of the DC relay control circuit.

4. The non-stop power transfer metering system for replacing electric energy meters according to claim 2 is characterized in that: The detection trigger circuit includes a rectifier circuit REC1, a capacitor C1, a capacitor C2, a resistor R1, a trigger circuit and a current and voltage detection circuit; The positive input terminal and the negative input terminal of the rectifier circuit REC1 are respectively connected to the two ends of the secondary winding of the transformer T1, the positive output terminal of the rectifier circuit REC1 is connected to one end of the resistor R1, the other end of the resistor R1 is grounded through the capacitor C2, the positive output terminal of the rectifier circuit REC1 is also grounded through the capacitor C1, the negative output terminal of the rectifier circuit REC1 is grounded, the input terminal of the trigger circuit is connected to the common connection point between the resistor R1 and the capacitor C1, the output terminal of the trigger circuit serves as the timing trigger signal output terminal of the detection trigger circuit, the voltage detection output terminal of the current and voltage detection circuit is connected to the voltage detection input terminal of the analog-to-digital conversion circuit, and the current detection output terminal of the current and voltage detection circuit is connected to the current detection input terminal of the analog-to-digital conversion circuit.

5. The non-stop power transfer metering system for replacing electric energy meters according to claim 4 is characterized in that: The current and voltage detection circuit includes a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and an operational amplifier U1; One end of the resistor R3 is connected to the common connection point between the resistor R1 and the capacitor C2 as the input end of the current and voltage detection circuit, the other end of the resistor R3 is grounded through the resistor R5, and the common connection point between the resistor R3 and the resistor R5 is used as the voltage detection output end Va / d of the current and voltage detection circuit, one end of the resistor R4 is connected to the common connection point between the resistor R3 and the resistor R5, the other end of the resistor R4 is grounded through the resistor R7, the common connection point between the resistor R4 and the resistor R7 is connected to the in-phase end of the operational amplifier U1, the inverting end of the operational amplifier U1 is connected to the common connection point between the resistor R5 and the ground through the resistor R6, the inverting end of the operational amplifier U1 is connected to the output end of the operational amplifier U1 through the resistor R8, and the output end of the operational amplifier U1 is used as the current detection output end Ia / d of the current and voltage detection circuit.

6. The non-stop power transfer metering system for replacing electric energy meters according to claim 4 is characterized in that: The trigger circuit includes a resistor R2 and an optical coupler OC1; One end of the resistor R2 is connected to the common connection point between the resistor R1 and the capacitor C1 as the input end of the trigger circuit, the other end of the resistor R2 is connected to the positive electrode of the light-emitting diode of the optocoupler OC1, the negative electrode of the light-emitting diode of the optocoupler OC1 is grounded, the collector of the phototransistor of the optocoupler OC1 is used as the timing trigger signal output end of the trigger circuit, and the emitter of the phototransistor of the optocoupler OC1 is grounded.

7. The non-stop power transfer metering system for replacing electric energy meters according to claim 2 is characterized in that: The wireless communication module is a 5G module.

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