Direct-type uninterruptible meter changing device

Abstract

The invention, which relates to the technical field of the electrical equipment, provides a direct-type power-failure-free meter replacement device comprising a meter replacement host used for disconnecting short-circuit current and preventing short circuit, overload and abnormal temperature rise of the power-failure-free meter replacement device; the wire inlet end connector is connected with the meter changing host, and the wire inlet end connector is used for constructing a new wire inlet power supply bypass and accelerating heat diffusion of the wire inlet end connector; the wire inlet end connector, the meter changing host and the wire outlet end connector are sequentially connected, the wire inlet end connector and the wire outlet end connector are connected to circuits at the two ends of an electric meter to be changed respectively, and the wire inlet end connector, the meter changing host and the wire outlet end connector form a new power supply bypass. And the wire outlet end connector is used for constructing a new wire outlet power supply bypass and accelerating thermal diffusion of the wire outlet end connector. The device can bear a large current, prolongs the service life of the device, and also can guarantee the safety of an operator.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and in particular to a direct non-stop meter replacement device. Background Art

[0002] A non-stop meter replacement device is a device that can achieve non-stop power outage during the replacement of residents' electricity meters. Traditional meter replacement work requires posting notices, copying the bottom readings of the electricity meter to inform users, power outage, disassembly and installation of meters, verification, power supply, etc., and residents' homes will be out of power for about 15 minutes. The non-stop meter replacement devices currently available on the market generally use puncture wire clamps to connect the power supply bypass system from the meter input and output lines, and cannot carry larger currents. However, direct non-stop meter replacement devices often need to carry larger currents, and the maximum current needs to reach 60A. The temperature rise at the connection point of the device increases rapidly, which affects the load-bearing capacity and life of the device. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a direct non-stop meter changing device in view of the above-mentioned deficiencies in the prior art, which can carry a large current, extend the service life of the non-stop meter changing device, and at the same time ensure the safety of operators.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A direct meter replacement device without power outage is used to replace an electricity meter to be replaced without power outage, comprising an incoming line connector, a meter replacement host and an outgoing line connector; the incoming line connector, the meter replacement host and the outgoing line connector are connected in sequence, and the incoming line connector and the outgoing line connector are respectively connected to the two end circuits of the electricity meter to be replaced, and the incoming line connector, the meter replacement host and the outgoing line connector constitute a new power supply bypass.

[0006] As a further preferred embodiment of the present invention, the meter replacement host includes a main control unit, a temperature sensing and protection unit, a phase discrimination unit, a short circuit and overload protection unit and a bypass power metering unit; the temperature sensing and protection unit, the phase discrimination unit, the short circuit and overload protection unit and the bypass power metering unit are respectively connected to the main control unit.

[0007] As a further preferred embodiment of the present invention, the incoming line connector includes an incoming line cable connection aviation plug, an incoming line cable and an incoming line power alligator clip; the incoming line cable connection aviation plug is connected to the incoming line of the meter changing host, and the incoming line power alligator clip is connected to the incoming line cable connection aviation plug through the incoming line cable; the incoming line power alligator clip is clamped on the incoming line circuit of the meter to be replaced.

[0008] As a further preferred embodiment of the present invention, the incoming line connector also includes an incoming line graphene thermal conductive film, and the incoming line graphene thermal conductive film is attached to the metal handle of the incoming line power alligator clip.

[0009] As a further preferred embodiment of the present invention, the outlet end connector includes an outlet end cable connection aviation plug, an outlet cable, an outlet terminal electrical clamp, a protective sealing rubber ring and an outlet graphene thermal conductive film; the outlet end cable connection aviation plug is connected to the outlet end of the meter replacement host, the outlet terminal electrical clamp is connected to the outlet end cable connection aviation plug through the outlet cable, the protective sealing rubber ring is arranged at the connection between the outlet cable and the outlet terminal electrical clamp, and the outlet graphene thermal conductive film is attached to the metal surface of the outlet terminal electrical clamp; the outlet terminal electrical clamp is clamped on the outlet end circuit of the meter to be replaced.

[0010] As a further preferred embodiment of the present invention, the phase discrimination unit includes 6 zero-crossing detection circuits, and the 6 zero-crossing detection circuits include front-end incoming line input A, B, C three-phase voltages and rear-end outgoing line A, B, C three-phase voltages.

[0011] As a further preferred embodiment of the present invention, an electronic release is provided inside the short circuit and overload protection unit.

[0012] As a further preferred embodiment of the present invention, a three-phase four-wire AC sampling circuit is constructed by using a metering chip inside the bypass power metering unit.

[0013] As a further optimization of the present invention, the main control unit is constructed based on the GD32F407 embedded processor; the temperature sensing and protection unit uses an NTC thermistor to measure the contact temperature, and the protection unit is a HF165FD-50 relay; the phase discrimination unit includes an optocoupler HK816, a diode M7, a transistor S9013, a resistor and a capacitor; the short circuit and overload protection unit is composed of an external low-voltage circuit breaker HXDB1N-100Z of the electric energy meter; and the bypass power metering unit is constructed by an ATT7022E metering chip.

[0014] The present invention has the following beneficial effects:

[0015] The present invention constructs a new incoming power supply bypass and an outgoing power supply bypass through an incoming line connector and an outgoing line connector to accelerate the heat diffusion of the incoming line connector and the outgoing line connector, and is respectively connected to a meter changing host to disconnect the short-circuit current and prevent the non-stop power meter changing device from short-circuiting, overloading and abnormal temperature rise. Thus, it can carry a larger current, extend the service life of the non-stop power meter changing device, and at the same time ensure the safety of the operating personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a block diagram of a direct non-stop meter replacement device according to an embodiment of the present invention;

[0017] Figure 2 A block diagram of a meter changing host according to an embodiment of the present invention;

[0018] Figure 3 A schematic structural diagram of an incoming line connector according to an embodiment of the present invention;

[0019] Figure 4 The figure is a schematic structural diagram of an outlet connector according to an embodiment of the present invention.

[0020] Among them are: 100, meter changing host; 101, main control unit; 102, temperature sensor and protection unit; 103, phase discrimination unit; 104, short circuit and overload protection unit; 105, bypass power metering unit; 200, incoming line connector; 201, incoming line cable connection aviation plug; 202, incoming line cable; 203, incoming line power alligator clip; 204, incoming line graphene thermal conductive film; 300, outgoing line connector; 301, outgoing line cable connection aviation plug; 302, outgoing line cable; 303, outgoing line terminal electrical clamp; 304, protective sealing rubber ring; 305, outgoing line graphene thermal conductive film. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.

[0022] In the description of the present invention, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second" and the like do not indicate the importance of the components, and therefore cannot be understood as limiting the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the scope of protection of the present invention.

[0023] Figure 1 It is a block diagram of a direct non-stop meter replacement device according to an embodiment of the present invention.

[0024] like Figure 1As shown, the direct non-stop power meter changing device of the embodiment of the present invention comprises: a meter changing host 100, an incoming line connector 200 and an outgoing line connector 300, wherein the meter changing host 100 is used to disconnect the short-circuit current to prevent the non-stop power meter changing device from short-circuiting, overloading and abnormal temperature rise; the incoming line connector 200 is connected to the meter changing host 100, and the incoming line connector 200 is used to construct a new incoming line power supply bypass and accelerate the heat diffusion of the incoming line connector 200; the outgoing line connector 300 is connected to the meter changing host 100, and the outgoing line connector 300 is used to construct a new outgoing line power supply bypass and accelerate the heat diffusion of the outgoing line connector 300.

[0025] In one embodiment of the present invention, Figure 2 As shown, the meter replacement host 100 may include: a main control unit 101, a temperature sensing and protection unit 102, a phase discrimination unit 103, a short circuit and overload protection unit 104, and a bypass power metering unit 105. The main control unit is constructed based on the GD32F407 embedded processor; the temperature sensing and protection unit 102 uses an NTC thermistor to measure the contact temperature, and the protection unit is composed of a HF165FD-50 relay; the phase discrimination unit 103 is composed of an optocoupler HK816, a diode M7, a triode S9013, and a resistor and a capacitor; the short circuit and overload protection unit 104 is composed of an external low-voltage circuit breaker HXDB1N-100Z of the electric energy meter; and the bypass power metering unit 105 is constructed of an ATT7022E metering chip.

[0026] Among them, the main control unit 101 is used to monitor the contact temperature of the incoming connector 200 and the outgoing connector 300; the temperature sensing and protection unit 102 is connected to the main control unit 101, and the temperature sensing and protection unit 102 is used to control the temperature rise of each contact of the incoming power supply bypass and the outgoing power supply bypass; the phase discrimination unit 103 is connected to the main control unit 101, and the phase discrimination unit 103 is used to determine the correspondence between the voltage phase on the user side and the voltage phase on the incoming end of the meter box; the short circuit and overload protection unit 104 is connected to the main control unit 101, and the short circuit and overload protection unit 104 is used to prevent the incoming and outgoing ends of the meter box from short circuit and overload; the bypass power metering unit 105 is connected to the main control unit 101, and the bypass power metering unit 105 is used to measure the voltage, current, power, phase and electric energy of the user during the replacement of the meter.

[0027] In one embodiment of the present invention, in the process of non-stop power meter replacement, being able to effectively control the temperature rise of each contact of the bypass circuit is a necessary measure to ensure the safety of on-site power operations. Specifically, in order to ensure the effectiveness of heat dissipation of the graphene thermal conductive film, the temperature sensing and protection unit 102 uses an NTC thermistor to measure the contact temperature. The protection unit is composed of an HF165FD-50 relay, which can have the function of real-time monitoring of the contact temperature of the incoming connector 200 and the outgoing connector 300. The temperature of the contacts at all electrical connections in the bypass system is monitored, and the temperature rise value is calculated based on the initial temperature and the real-time temperature.

[0028] Furthermore, the temperature and temperature rise limits can be preset. When the contact temperature reaches the preset value or the contact temperature rise reaches the preset value, an alarm or a delay cut-off of the current can be issued according to the preset procedure. For example, when the maximum temperature of the contact reaches 70°C or the contact temperature rise exceeds 30K, an alarm is issued; when the contact temperature exceeds 80°C or the contact temperature rise exceeds 40K, the circuit is automatically cut off after a delay of 2 minutes while an alarm is issued.

[0029] The initial contact temperature can be the contact temperature when the power supply bypass formed by the inlet and outlet connector is switched on and off. This temperature is generally lower than the temperature of the current flowing part in the meter box during normal operation. And the contact temperature rise = current contact temperature - initial contact temperature. Since the initial contact temperature is lower than the temperature of the current flowing part in the meter box during normal operation, the contact temperature rise is generally higher than the temperature rise of the equipment in the meter box.

[0030] In one embodiment of the present invention, the phase discrimination unit 103 may be composed of 6 zero-crossing detection circuits, wherein the 6 zero-crossing detection circuits may include front-end incoming line input A, B, C three-phase voltages, and rear-end outgoing line A, B, C three-phase voltages. The 6 zero-crossing square wave signals are input to the CPU interrupt pin of the main control unit 101, and the program determines the corresponding relationship between the voltage phase on the user side and the voltage phase on the incoming line of the meter box through the rising edge position of the square wave.

[0031] In one embodiment of the present invention, the short-circuit and overload protection unit 104 may be designed with an electronic release, and the overcurrent tripping characteristics may be set as follows: 1.05In, no tripping within 2 hours; 1.2In, delayed tripping. The short-circuit protection characteristics may be set as follows: 5In, tripping time <0.2s; rated operating short-circuit breaking capacity Ics not less than 4500A; rated ultimate short-circuit breaking capacity Icu not less than 6000A.

[0032] In one embodiment of the present invention, a three-phase four-wire AC sampling circuit can be constructed by using a metering chip inside the bypass power metering unit 105. By collecting input voltage (phase A, phase B and phase C) and output current, the voltage, current, power, phase and other electrical parameters of the meter replacement user during the meter replacement period are measured to measure the electric energy. The model of the metering chip can be ATT7022E. After the operator scans the barcode of the electric energy meter to be replaced with a barcode scanner, the metering function is turned on to measure the bypass flow in the current meter replacement operation.

[0033] In one embodiment of the present invention, Figure 3 As shown, the incoming line connector may include: an incoming line cable connection aviation plug 201, an incoming line cable 202, an incoming line power alligator clip 203 and an incoming line graphene thermal conductive film 204, wherein the incoming line cable connection aviation plug 201 is connected to the incoming line end of the meter replacement host 100; the incoming line cable 202 is connected to the incoming line cable connection aviation plug 201; the incoming line power alligator clip 203 is connected to the incoming line cable 202; and the incoming line graphene thermal conductive film 204 is attached to the metal handle of the incoming line power alligator clip 203.

[0034] In one embodiment of the present invention, Figure 4 As shown, the outlet connector may include: an outlet cable connection aviation plug 301, an outlet cable 302, an outlet terminal electrical clamp 303, a protective sealing rubber ring 304 and an outlet graphene thermal conductive film 305, wherein the outlet cable connection aviation plug 301 is connected to the outlet terminal of the meter replacement host 100; the outlet cable 302 is connected to the outlet cable connection aviation plug 301; the outlet terminal electrical clamp 303 is connected to the outlet cable 302; the protective sealing rubber ring 304 is connected to the outlet cable 302 and the outlet terminal electrical clamp 303; the outlet graphene thermal conductive film 305 is attached to the metal surface of the outlet terminal electrical clamp 303, and the outlet terminal electrical clamp 303 is used to be clamped on the circuit breaker behind the electric energy meter.

[0035] In one embodiment of the present invention, since part of the metal surfaces of the incoming line connector 200 and the outgoing line connector of the non-stop power meter replacement device are affixed with a graphene thermal conductive film, the heat dissipation speed of the contact surface can be accelerated, thereby allowing the subsequent temperature protection to delay the action and increase the bypass current capacity. Among them, the heat dissipation principle of the graphene thermal conductive film can be: when the non-stop power meter replacement operation is carried out on site, a load current flows through the circuit of the incoming and outgoing line connector 200, and the incoming line connector 200 and the outgoing line connector 300 affixed with the graphene thermal conductive film have two main heat dissipation pathways, one is the heat Qa conducted by the graphene thermal conductive film, and the other is the heat Qb conducted by the metal contact. The total heat Q transferred by the connector can be expressed as:

[0036] Q=Qa+Qb

[0037] According to the heat conduction theory, the heat conduction formula of graphene thermal conductive film can be expressed as:

[0038]

[0039] Among them, Qa is the conduction heat of the graphene thermal conductive film, A is the cross-sectional area of ​​the metal contact, ΔT is the temperature difference between the contact point at the top of the contact and the cable connection end, γ is the thermal conductivity of the graphene thermal conductive film, and L is the contact length.

[0040] The alligator clip 203 for taking power from the incoming line and the electrical clamp 303 for the outgoing line are respectively clamped on the circuits at both ends of the meter to be replaced; in addition, the alligator clip 203 for taking power from the incoming line and the electrical clamp 303 for the outgoing line are connected to the meter replacement host 100, and the meter replacement host 100 is connected in parallel with the meter to be replaced through the incoming line connector 200 and the outgoing line connector 300, and finally a new power supply bypass is formed by the alligator clip 203 for taking power from the incoming line and the electrical clamp 303 for the outgoing line and the meter replacement host 100, so that the old meter can be replaced with the new one without interrupting the power supply to the user load.

[0041] To summarize, according to the direct non-stop power meter changing device of the embodiment of the present invention, a new incoming power supply bypass and outgoing power supply bypass are constructed through the incoming line connector and the outgoing line connector to accelerate the heat diffusion of the incoming line connector and the outgoing line connector, and are respectively connected to the meter changing host to disconnect the short-circuit current and prevent the non-stop power meter changing device from short-circuiting, overloading and abnormal temperature rise. As a result, it can carry a larger current, extend the service life of the non-stop power meter changing device, and at the same time ensure the safety of the operating personnel.

[0042] The preferred embodiments of the present invention are described in detail above; however, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A direct non-stop meter replacement device, used for replacing a meter without power outage, characterized in that: The invention comprises an incoming line connector (200), a meter replacement host (100) and an outgoing line connector (300); the incoming line connector (200), the meter replacement host (100) and the outgoing line connector (300) are connected in sequence, and the incoming line connector (200) and the outgoing line connector (300) are respectively connected to the circuits at both ends of the meter to be replaced, and the incoming line connector (200), the meter replacement host (100) and the outgoing line connector (300) form a new power supply bypass.

2. A direct non-stop meter replacement device according to claim 1, characterized in that: The meter replacement host (100) comprises a main control unit (101), a temperature sensing and protection unit (102), a phase discrimination unit (103), a short circuit and overload protection unit (104) and a bypass power measurement unit (105); the temperature sensing and protection unit (102), the phase discrimination unit (103), the short circuit and overload protection unit (104) and the bypass power measurement unit (105) are respectively connected to the main control unit (101).

3. A direct non-stop meter replacement device according to claim 1, characterized in that: The incoming line connector (200) comprises an incoming line cable connecting aviation plug (201), an incoming line cable (202) and an incoming line power crocodile clip (203); the incoming line cable connecting aviation plug (201) is connected to the incoming line of the meter replacement host (100), and the incoming line power crocodile clip (203) is connected to the incoming line cable connecting aviation plug (201) via the incoming line cable (202); the incoming line power crocodile clip (203) is clamped on the incoming line circuit of the meter to be replaced.

4. A direct non-stop meter replacement device according to claim 3, characterized in that: The incoming line connector (200) further comprises an incoming line graphene heat-conducting film (204), wherein the incoming line graphene heat-conducting film (204) is attached to a metal handle of an incoming line power-taking crocodile clip (203).

5. The direct non-stop meter replacement device according to claim 1, characterized in that: The outlet connector (300) comprises an outlet cable connection aviation plug (301), an outlet cable (302), an outlet terminal electrical clamp (303), a protective sealing rubber ring (304) and an outlet graphene thermal conductive film (305); the outlet cable connection aviation plug (301) is connected to the outlet terminal of the meter replacement host (100); the outlet terminal electrical clamp (303) is connected to the outlet cable connection aviation plug (301) through the outlet cable (302); the protective sealing rubber ring (304) is arranged at the connection between the outlet cable (302) and the outlet terminal electrical clamp (303); the outlet graphene thermal conductive film (305) is attached to the metal surface of the outlet terminal electrical clamp (303); the outlet terminal electrical clamp (303) is clamped on the outlet circuit of the meter to be replaced.

6. A direct non-stop meter replacement device according to claim 2, characterized in that: The phase discrimination unit (103) comprises 6 zero-crossing detection circuits, and the 6 zero-crossing detection circuits comprise front-end incoming line input three-phase voltages A, B, C and rear-end outgoing line three-phase voltages A, B, C.

7. The direct non-stop meter replacement device according to claim 2, characterized in that: An electronic release is arranged inside the short circuit and overload protection unit (104).

8. The direct non-stop meter replacement device according to claim 2, characterized in that: A three-phase four-wire AC sampling circuit is constructed by using a metering chip inside the bypass electricity metering unit (105).

9. The direct non-stop meter replacement device according to claim 2, characterized in that: The main control unit (101) is constructed based on a GD32F407 embedded processor; the temperature sensing and protection unit (102) uses an NTC thermistor to measure the contact temperature, and the protection unit is a HF165FD-50 relay; the phase discrimination unit (103) includes a photoelectric coupler HK816, a diode M7, a transistor S9013, a resistor and a capacitor; the short circuit and overload protection unit (104) is composed of an external low-voltage circuit breaker HXDB1N-100Z of an electric energy meter; and the bypass power metering unit (105) is constructed by an ATT7022E metering chip.

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