CN109001511A - A kind of micro- ammeter - Google Patents

Abstract

The present invention provides a kind of micro- ammeter, and micro- ammeter is attached on miniature circuit breaker, is mechanically connected between miniature circuit breaker by the wedging between face and face.Micro- ammeter includes power taking plug and metering units, and power taking plug takes electricity by the binding post lock screw for taking electric probe to be resisted against miniature circuit breaker on spring, is powered by the first electric connector and the second electric connector of plug connection to metering units.This micro- ammeter can may be implemented not power off installation with external open type current transformer；Varistor module protection late-class circuit is added in power taking plug, improves the security performance of micro- ammeter；Using isolation 485, the interference free performance of circuit can be enhanced.The device in circuit board reduces the thickness and size of micro- ammeter, more is miniaturized, the installation to existing distribution box or power distribution cabinet may be implemented by reasonable arrangement on the whole.

Description

a micrometer

technical field

The invention relates to the technical field of power system equipment, in particular to a micrometer.

Background technique

On the one hand, in order to promote energy conservation and emission reduction, the state has introduced a series of technical and economic measures for power demand side management, including load control, time-of-use electricity price, and stepped electricity price. The introduction of these measures and the improvement of people's awareness of environmental protection have prompted power customers to strive to obtain data on the use of electrical equipment, and to adopt and implement reasonable power management methods to reduce power consumption and electricity bills. Usually, an important way for users to obtain electricity consumption information is the monthly electricity bill. Due to technical limitations, the bill can only inform the user of the total electricity consumption in a certain period of time. Obtaining the power consumption of each device is the basis for carrying out energy-saving work. To know the composition of power consumption and the environmental factors that affect power consumption, it is required to be able to analyze and implement control methods to save power. It is necessary to obtain the power consumption of each device . However, due to the lack of professional knowledge and means of power consumption, power companies and users cannot obtain the power consumption of each device. When users have doubts about the quality and measurement of electric energy, they can only use the data of the power supply company, causing users to have doubts about the services provided by the power supply company during the use of electric energy. Power supply companies also need detailed data to provide customers with high-quality services.

On the other hand, with the development of global smart manufacturing and the Internet of Things in the power system, new models and new formats of power consumption management such as "smart power consumption" and "Internet + smart power consumption" have emerged, and "smart power consumption" is entering the people's lives.

A circuit breaker is a switching device that can close, carry and break current under normal circuit conditions and can close, carry and break current under abnormal circuit conditions within a specified time. In the generation, transmission and use of electricity, power distribution is an extremely important link. The power distribution system includes transformers and various high and low voltage electrical equipment. Whether it is energy saving and emission reduction, or smart power consumption, "Internet + smart power consumption", if you want to obtain power usage data of various electrical equipment, truly realize energy saving and emission reduction, and smart power consumption management, you cannot bypass the power consumption gateway -MCB.

Miniature circuit breakers are widely used in various fields because of their small size, convenience and intelligent functions. However, the circuit breakers used in urban power grids, industrial and mining enterprises, and ordinary household power grids are still non-intelligent circuit breakers and still remain in the stage of "dumb equipment". Therefore, in a fairly long period of time, power companies and industrial and mining enterprises will completely replace these production and living power equipment or traditional circuit breakers in large numbers, which will be very costly and will also bring great harm to the production and life of industrial and mining enterprises and residents. inconvenient. How to install data acquisition components and control components as low-cost, convenient, reliable, and space-free as possible on the basis of the original circuit breaker and distribution box, and without additional power supply for data acquisition components and control components, become An urgent and valuable innovation topic.

Contents of the invention

The purpose of the present invention is to solve the shortcomings in the prior art, and propose a micrometer.

In order to solve the above problems, the technical solution of the present invention is as follows:

A micrometer, the micrometer is attached to the miniature circuit breaker and is mechanically connected to the miniature circuit breaker, the micrometer includes a power-taking plug and a metering unit, and the power-taking plug is plugged into a micro The circuit breaker takes power from the locking screw of the terminal post of the miniature circuit breaker, and supplies power to the metering unit.

Preferably, the miniature circuit breaker includes a first connection surface, a second connection surface and terminal locking screws, the first connection surface is connected to the second connection surface and are perpendicular to each other, and the terminal locking screws Set on the first connection surface, the power-taking plug is plugged into the terminal locking screw, and the metering unit is installed on the second connection surface; the power-taking plug and the metering The units are detachably connected independently of each other.

Preferably, the power-taking plug is detachably connected to the first connection surface, and the power-taking plug includes a power-taking shell, a plug plate, a spring power-taking probe, a first electrical connector, and a positioning groove; The power-taking housing is in the shape of a cuboid, the plug board is embedded in the inside of the power-taking housing, and the spring power-taking probe and the first electrical connector are welded on the plug board. Both the spring power-taking probes and the first electrical connector extend through the power-taking housing to the outside of the power-taking housing, and the spring power-taking probes abut against the power-taking probes one by one. On the locking screw of the terminal post, the spring power-taking probe and the first electrical connector are respectively located on two adjacent side surfaces of the power-taking housing, and the positioning grooves are arranged on the two adjacent second In the middle of an electrical connector, and located at the bottom end of the surface where the first electrical connector is located;

The metering unit is detachably connected to the second connection surface, and the metering unit includes a metering housing, a power board, a metering board, a 485 interface, a transformer interface, and a second electrical connector; the metering housing includes a convex surface, The concave surface and the wedging surface, the convex surface and the concave surface are parallel to each other, the 485 interface and the transformer interface are arranged side by side on the concave surface, the wedging surface is opposite to the concave surface, and the wedging surface surface and the second connection surface are wedging; the wedging surface is integrally provided with a plug and a limit baffle, and the plug is inserted into the socket on the second connection surface to block the The limit baffles on both sides of the second connection surface are embedded in the corresponding slots on both sides of the second connection surface; the power supply board and the metering board are both engaged in the Inside the metering shell, the metering board includes a board-to-board connector seat, a transformer connector seat and a 485 connector seat, and one end of the power board is provided with a board-to-board connector head; the transformer connector seat Installed side by side with the 485 connector seat at one end of the metering board, the board-to-board connector seat is next to the transformer connector seat and the 485 connector seat, the power board and the metering board The boards are fixedly connected by inserting the board-to-board connector head into the board-to-board connector seat, the metering board and the power board are parallel to the convex surface and the concave surface, The transformer connector seat and the 485 connector seat on the metering board pass through the transformer interface and the 485 interface respectively, and extend out of the metering shell; the second electrical connector is welded on The power supply board passes through the metering housing and protrudes to the outside of the metering housing, the second electrical connector is located directly above the wedging surface, and the second electrical connector is connected to the first An electrical connector is connected in a plug-in manner;

When the power-taking plug is connected to the miniature circuit breaker, the spring power-taking probes abut against the locking screws of the binding posts one by one and are electrically connected with them, and the spring power-taking probes The probe takes power from the miniature circuit breaker and transmits it to the first electrical connector through the plug board through the transformation of voltage and current; when the wedging surface is inserted into the second connection surface, The metering unit is connected to the miniature circuit breaker, and the first electrical connector is connected to the second electrical connector by plugging and unplugging, and the power-taking plug is clamped on the miniature circuit breaker In the middle of the metering unit, the electricity obtained by the power-taking plug from the miniature circuit breaker is supplied to the metering unit through the connected first electrical connector and the second electrical connector.

Preferably, the plug board includes a piezoresistor module, a full-wave rectification module, and a voltage sampling module; the piezoresistor module is electrically connected to the spring power-taking probe to protect subsequent circuits. The wave rectification module is connected with the piezoresistor module for full-wave rectification of the current taken to output direct current, and the voltage sampling module is connected with the metering board through a circuit.

Preferably, the power-taking plug includes a bottom plate and a vertical plate, the bottom plate and the vertical plate are perpendicular to each other, and the varistor module varistor and diode, further, includes 3 varistors and 6 diodes ; The piezoresistor is welded on the plug board and is located on the same plane as the spring power-taking probe, the diode is welded on the back of the piezoresistor, and the piezoresistor lies on the vertical plate , further, press to lie on the vertical plate at 90 degrees, the diode lies on the bottom plate, further, press to lie on the bottom plate at 90 degrees; the voltage sampling module includes a resistor network, the resistance network is divided into 3 groups, wherein 2 groups of the resistance network are welded on the vertical plate, and 1 group of the resistance network is welded on the bottom plate; the varistor is a high-energy 10D471 varistor , the diode is a high-voltage rectifier diode R3000 with a withstand voltage of 3KV, and the safety distance between the wires of the plug board is greater than 4 millimeters; the three groups of resistor networks used for stepping down correspond to the voltage sampling of the three-phase three-wire respectively, and the The three sets of resistor networks are directly welded on the metering board, and the positive and negative poles of the rectified output DC voltage of the full-wave rectification module are directly welded on the power supply board.

Preferably, the height of the micrometer is not greater than 32mm, the thickness of the micrometer is not greater than 25mm, and the width of the micrometer is 18mm, and the width of the micrometer is the same as that of the miniature circuit breaker .

Preferably, the spring power-taking probe on the power-taking housing includes an integrally injection-molded circular deck, and the circular deck is a circular deck that is recessed toward the inside of the power-taking housing, so The inner diameter of the circular deck is the same as the outer diameter of the terminal locking screw, and the circular deck is in one-to-one correspondence with the terminal locking screws; a probe is fixed in the center of the circular deck The needle cover, the probe cover is made of the same material as the spring power-taking probe, and the spring power-taking probe passes through the probe cover and connects with the terminal locking screw; when the spring takes power The probe passes through the probe cover, and the plug board is inserted into the first housing to expand the power-taking shell, so as to be fixed in the power-taking shell; the power-taking shell and the power-taking shell The outline of the intersection of the first connection surface is the same, that is, the junction of the power-taking shell and the first connection surface fits; the power-taking shell includes a slide cover, and the slide cover and the spring take power The probes are relatively and slidably installed on the power-taking housing; the metering housing includes a first housing and a second housing, the first housing and the second housing are detachable independent structures, And the connecting surface of the first housing and the second housing is parallel to the wedging surface; the plug of the wedging surface includes various structures to match with different miniature circuit breakers, and the The profile of the intersection of the wedging surface and the second connecting surface is the same, that is, the joint of the wedging surface and the second connecting surface fits.

Preferably, the metering unit includes a step-down module, a conversion module, a CPU operation processing module, a storage module, a communication module, and a power supply module; the electrical signal of the power-taking plug is processed by the step-down module and then transmitted to the conversion module, the conversion module is electrically connected to the CPU operation processing module, and the CPU operation processing module is also electrically connected to the storage module, the communication module and the power supply module respectively, and the power supply module is connected to the The communication module and the CPU operation processing module are powered; the power board includes the communication module, the power module and an isolation module, the communication module includes a 485 chip and its protection circuit and a communication port, and the power module includes A DC voltage stabilization module and a DC voltage isolation module, the isolation module is an optocoupler isolation module, which isolates the communication module from other modules, and the DC voltage stabilization module is connected to the 485 protection chip and its protection circuit and supplies power to it, The communication port is electrically connected to the 485 protection chip and its protection circuit; the metering board includes the step-down module, the CPU operation processing module, the analog-to-digital conversion module, and the storage module. The step-down module is a voltage dividing network and is located at the front end of the metering board. The analog-to-digital conversion module is connected to the CPU operation processing module, and the storage module is installed next to the CPU operation processing module and connected to it.

Preferably, the power board includes a step-down module, an isolation module, a conversion module, a 5V power supply and a 3.3V power supply, and the step-down module connected to the plug board performs step-down processing on the electricity taken, and the conversion module and the Both the step-down module and the isolation module are connected, the stepped-down 5V power supply and the 3.3V power supply are isolated from the step-down module through the isolation module, and both the 5V power supply and the 3.3V power supply are the 485 Connector seat power supply; the 3.3V power supply and the 5V power supply are not in common ground, the 5V power supply is connected to GND1, and the 3.3V power supply is connected to GND; the 485 connector seat adopts the form of an isolated 485 communication interface, and the The 485 connector seat includes an isolated 485 module and a 485 driver module, the 485 module is powered by a 3.3V power supply, and the 485 driver module is powered by a 5V power supply; the metering board also includes a virtual analog ground, and the analog ground passes through The circuit is electrically connected to the voltage sampling unit and the transformer connector base, and the analog ground and the GND single-point common ground; the transformer connector base is externally connected to an open-type current transformer.

Preferably, an indicator light is installed on the top of the second housing; the indicator light is inlaid with the light housing using a light guide material.

Compared with the prior art, the micrometer of the present invention is attached to the miniature circuit breaker, and the micrometer includes a power-taking plug and a metering unit, both of which are independent replaceable units, and are very convenient for installation and maintenance. The power-taking plug uses a pogo pin to take power from the miniature circuit breaker, which is convenient and safe. Both the power-taking plug and the metering unit are inserted and wedged with the corresponding mating surface of the miniature circuit breaker, and the installation is firm and easy to disassemble. The circuit board design components of the micro-meter are compact and arranged in an orderly manner. The larger capacitors and varistors are placed lying down to reduce the height of the circuit board and save space. The volume of the micro-meter is reduced as much as possible, making the meter The miniaturization is more significant, and it can be retrofitted to existing distribution boxes or distribution cabinets. The presence of the varistor can protect the subsequent circuit, improve the resistance index of the meter, and make the meter safer to use. This micrometer provides transformer interface. For three-phase three-wire miniature circuit breaker, three external current transformers can be connected. The current transformer can be selected according to the rated current of the miniature circuit breaker. In the present invention, the open-type current transformer is selected, so that the installation of the micro-meter to the micro-circuit breaker can realize continuous power installation, which solves the installation problem that the existing micro-circuit breaker cannot be artificially cut off. The whole micrometer is small and exquisite, easy to install, and the safety is greatly improved.

Description of drawings

Figure 1 is a schematic diagram of the installation of the micrometer;

Fig. 2 is a schematic diagram of the separation structure of the power-taking plug;

Fig. 3 is the separation structure schematic diagram of metering unit;

Figure 4 is a schematic diagram of the overall structure of the power-taking plug;

Fig. 5 is the structural representation of wedging surface;

6 is a schematic diagram of the overall structure of the metering unit;

Fig. 7 is the connection relationship diagram of the circuit modules of the micrometer;

Fig. 8 is the schematic circuit diagram of the electric plug;

Fig. 9 is the PCB design drawing of the circuit board of the electric plug;

Fig. 10 is the connection diagram of the circuit modules of the metering unit;

Figure 11 is the PCB design diagram of the metering board;

Figure 12 is the PCB design diagram of the power board;

Fig. 13 is a schematic diagram of the actual ground conversion circuit of the metering unit.

Detailed ways

In order to have a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed descriptions are provided in conjunction with the embodiments.

As shown in Figure 1, a kind of micrometer, micrometer 2 is attached on the miniature circuit breaker 1 and is mechanically connected with the miniature circuit breaker 1, micrometer 2 includes a power-taking plug 21 and a metering unit 22, and the power-taking plug Plugging in the miniature circuit breaker takes power from the locking screw of the terminal post of the miniature circuit breaker, and supplies power to the metering unit.

In one embodiment, the miniature circuit breaker 1 includes a first connecting surface 11, a second connecting surface 12 and terminal locking screws, the first connecting surface 11 is connected to the second connecting surface 12 and are perpendicular to each other, and the terminal locking screws Set on the first connection surface 11, the terminal locking screw is made of metal and the top is exposed outside, so as to be electrically connected with the micrometer 2, and the electric plug 21 is plugged into the terminal of the first connection surface 11 and locked. Electricity is taken on the screw, and metering unit 22 is installed on the second connection surface 12, so that the power-taking plug 21 is vertically installed on two different surfaces with metering unit 22, and does not affect the respective installation of each other, which is more convenient.

Further, the power-taking plug 21 and the metering unit 22 are mutually independent detachable connection modes, that is, the power-taking plug 21 and the metering unit 22 can be disassembled separately, and can be removed separately when the micrometer 2 needs maintenance and replacement. It is also more convenient when installing.

As shown in FIG. 1 , the power-taking plug 21 is detachably connected to the first connection surface 11 , and the power-taking plug 21 is electrically connected with the miniature circuit breaker 1 . As shown in FIG. 2 , the power-taking plug 21 includes a power-taking housing 211 , a plug plate 212 , a spring-feeding probe 213 , a first electrical connector 214 and a positioning slot 215 . The power-taking shell 211 is in the shape of a cuboid. The plug board 212 is embedded in the inside of the power-taking shell 211. The spring power-taking probe 213 and the first electrical connector 214 are welded on the plug board 212. The spring power-taking probe 213 Both the first electrical connector 214 and the first electrical connector 214 protrude to the outside of the power-taking housing 211 through the power-taking housing 211, and the spring power-taking probes 213 abut against the locking screws of the binding posts one by one, and the spring power-taking probes 213 and the first electrical connector 214 are respectively located on two adjacent side surfaces of the power-taking housing 211, and the positioning groove 215 is arranged in the middle of two adjacent first electrical connectors 214, and is located where the first electrical connector 214 is located. bottom of the face. When the power-taking plug 21 is installed, the spring power-taking probes 213 will abut against the exposed top of the terminal locking screws one by one, and the materials of the terminal locking screws and the spring power-taking probes 213 are both conductive. Metal, so the power-taking plug 21 is electrically connected to the miniature circuit breaker 1, and the power-taking plug 21 takes power from the miniature circuit breaker 1, and then transmits it to the plug board 212 through the spring power-taking probe 213, and conducts the electricity taken. Subsequent processing.

As shown in FIG. 1 , the metering unit 22 is detachably connected to the second connecting surface 12 . As shown in FIG. 3 , the metering unit 22 includes a metering housing 221 , a power board 222 , a metering board 223 , a 485 interface 224 , a transformer interface 225 and a second electrical connector 226 . The metering housing 221 includes a convex surface 2211, a concave surface 2212 and a wedging surface 2213. The convex surface 2211 and the concave surface 2212 are parallel to each other, and the 485 interface 224 and the transformer interface 225 are arranged side by side on the concave surface 2212. The surface 2213 is wedged with the second connection surface 12 to fix the metering unit 22 on the miniature circuit breaker 1 . As shown in Figure 5, a plug 2214 and a limit baffle 2215 are integrally provided on the wedging surface 2213, and the plug 2214 is embedded in the socket on the second connection surface 12 to block the two sides of the second connection surface 12. The limit baffle 2215 on the side is embedded in the corresponding slots on both sides of the second connection surface 12, and the plug 2214 is inserted in the socket of the second connection surface 12 to expand the plug of the second connection surface 12. holes to achieve the purpose of fixing, and the limit baffle 2215 can prevent the metering unit 22 from shaking up and down or left and right, and can further fix the metering housing 221. Both the power board 222 and the metering board 223 are engaged in the metering housing 221 and can be taken out for inspection and maintenance at any time. The metering board 223 includes a board-to-board connector seat 2231 , a transformer connector seat 2232 and a 485 connector seat 2233 , and one end of the power board 222 is provided with a board-to-board connector head. The transformer connector seat 2232 and the 485 connector seat 2233 are installed side by side on one end of the metering board 223, so that the transformer connector seat 2232 and the 485 connector seat 2233 are in a row and are located at the end of the metering board 223. The transformer interface 225 and the interface 226 of the 485 of the shell 221 protrude out of the shell, so as to facilitate the external connection of other required devices. The board-to-board connector seat 2231 is next to the transformer connector seat 2231 and the 485 connector seat 2233, and the board-to-board connector head is inserted into the board-to-board connector seat 2232 between the power board 222 and the metering board 223 The method of plugging and unplugging makes the connection between the power board 222 and the metering board 223 more firm, and the metering board 223 can be close to the transformer connector seat 2232 and the 485 connector seat 2233, and the two boards are closely connected. It can save space to a greater extent and reduce the volume of the metering unit 22 . The metering board 223 and the power board 222 are parallel to the convex surface 2211 and the concave surface 2212. The transformer connector seat 2232 and the 485 connector seat 2233 on the metering board 223 pass through the transformer interface 225 and the 485 interface 224 respectively, and extend out of the metering shell 221 , for easy connection to other interfaces and devices. The second electrical connector 226 is welded on the power supply board 222 and extends out of the metering housing 221 through the metering housing 221. The second electrical connector 226 is located directly above the wedging surface 2213. The second electrical connector 226 is connected to the second electrical connector 221. An electrical connector 214 is connected in a plug-in manner, firmly connects the power-taking plug 21 and the metering unit 22 together, and simultaneously transmits the electricity obtained by the power-taking plug 21 to the metering unit.

As shown in Figures 1, 2, and 3, when the power-taking plug 21 is connected to the miniature circuit breaker 1, the spring power-taking probes 213 abut against the locking screws of the binding posts one by one and are electrically connected to them. The spring power-taking probe 213 takes power from the miniature circuit breaker 1 and transmits it to the first electrical connector 214 through the plug plate 212 through the voltage and current conversion; when the wedging surface 2213 is embedded on the second connection surface 12, the measurement The unit 22 is connected with the miniature circuit breaker 1, and the first electrical connector 214 and the second electrical connector 226 are connected by plugging and unplugging, and the power-taking plug 21 is sandwiched between the miniature circuit breaker 1 and the metering unit 22, The electricity obtained by the power-taking plug 21 from the miniature circuit breaker 1 is supplied to the metering unit through the connected first electrical connector 214 and second electrical connector 226 .

In one embodiment, as shown in FIG. 7 , the plug board 212 includes a piezoresistor module, a full-wave rectification module, and a voltage sampling module; the piezoresistor module is electrically connected to the spring electric probe to protect the subsequent stage circuit After the current is transmitted from the power-taking plug 21 to the metering unit 22, it first passes through the varistor module, and performs voltage clamping when the circuit is subjected to overvoltage, and absorbs excess current to protect sensitive components. Between the two poles, the varistor can clamp the voltage to a relatively fixed voltage value, so as to realize the protection of the subsequent circuit and prevent the subsequent circuit from being broken down or short-circuited due to excessive current. The full-wave rectification module is connected with the piezoresistor module to perform full-wave rectification on the taken alternating current and output direct current. As shown in FIG. board 223. As shown in Figures 2 and 7, the power-taking plug 21 includes a base plate 217 and a riser 218, the base plate 217 and the riser 218 are perpendicular to each other, and the piezoresistor module includes a piezoresistor 219 and a diode, the number of which is preferably three piezoresistors 219 and 6 diodes; the piezoresistor 219 is welded on the plug board 212 and is positioned at the same plane with the spring electric probe 213, and the diode is welded on the back side of the piezoresistor 219, and the piezoresistor lies on the vertical plate 218, preferably Yes, the piezoresistor 219 is pressed to 90 degrees to lie on the vertical plate 218, and the diode is to lie on the bottom plate 217. Preferably, the pressure-sensitive resistor 219 is pressed to 90 degrees to lie on the bottom plate 217; the voltage sampling module includes a resistor network, and the resistor network is divided into There are 3 groups, wherein 2 groups of resistance networks are welded on the riser 218, and 1 group of the resistance network is welded on the bottom plate 217, so that the arrangement and welding of components on the plug board 212 and the plug board 212 can be realized in a small The welding of the proper circuit is completed in the space, the volume of the power-taking plug 21 is reduced as much as possible, and the miniaturization of the micrometer 2 is further realized, which is convenient for additional installation. The varistor 219 is a high-energy 10D471 varistor, the diode is a high-voltage rectifier diode R3000 with a withstand voltage of 3KV, and the safety distance between the wires of the plug board 212 is greater than 4mm, and a high-energy 10D471 varistor and a high-voltage rectifier diode R3000 with a withstand voltage of 3KV are selected. , can protect the subsequent circuit when the circuit is subjected to a sudden high-intensity current, can meet the safety requirements of some specific customers, and further ensure the safety of the micrometer 2. The three sets of resistor networks used for step-down correspond to the voltage sampling of the three-phase three-wire respectively, and the three sets of resistor networks are directly welded on the metering board 223, and the positive and negative poles of the DC voltage output by the full-wave rectification module are directly welded on the power supply board 222, so that the connection between the plug board 212 and the metering board 223 and between the plug board 212 and the power board 223 is more firm, and the voltage transmission between the boards is more stable.

As shown in Figure 8, for the circuit of the power-taking plug 21, three spring power-taking probes 213, namely L1, L2, and L3, are connected to the varistors RV1, RV2, and RV3 to protect the subsequent stage circuit composed of a resistor network and a diode. Step down and rectify the obtained 220V three-phase power, and connect the varistor RV4 to protect the post-stage circuit in the two poles of the rectified direct current, and the rectified circuit is placed on the power board. The other part of the three-phase circuit sampled from before the resistance network without rectification is welded on the metering board after the resistance is lowered, and still exists in the form of alternating current. FIG. 9 is the arrangement of electrical components in FIG. 7 . Single-ply boards are thinner.

Preferably, the height of the micrometer 2 is not greater than 32 mm, the thickness of the micrometer 2 is not greater than 25 millimeters, the width of the micrometer 2 is 18 millimeters, the width of the micrometer 2 is the same as that of the micro circuit breaker 1, and the height of the micrometer 2 is The design of not more than 32mm will not affect the panel installation of the PZ30 box; the thickness of the micrometer 2 is 24.7mm, not more than 25mm, and the strict size design makes the micrometer 2 not too thick and does not affect the wiring in the PZ30 box Operation; the width of the micrometer 2 is 18 millimeters, namely 1P, that is to say, it can only be consistent with the width of the miniature circuit breaker 1, for example, if the circuit breaker is a 3P circuit breaker, the width of the micrometer 2 is 54 millimeters.

In another embodiment, as shown in FIGS. 2 and 4 , the spring power-taking probe 213 on the power-taking housing 211 includes an integrally injection-molded circular holder 2131 . The inner recessed circular socket 2131, the inner diameter of the circular socket 2131 is the same as the outer diameter of the terminal locking screw, the circular socket 2131 corresponds to the terminal locking screw one by one, when the power-taking plug 21 is inserted into the When the spring power-taking probe 213 is on, the circular clamping seat 2131 is stuck on the outside of the locking screw of the binding post, so that the connection is more secure. The center of the circular deck 2131 is fixed with a probe cover 2132, the probe cover 2132 is made of the same material as the spring power-taking probe 213, and the spring power-taking probe 213 passes through the probe cover 2132 and connects with the terminal locking screw; The spring power-taking probe 213 passes through the probe cover 2132, and the plug plate 212 is embedded in the power-taking shell 211 to expand the power-taking shell 211, so that it is fixed in the power-taking shell 211, and the spring power-taking probe 213 is plugged into the power-taking shell 211. Move up and down in the probe cover 2132 to prevent falling off, which is safer.

In one embodiment, the outline of the intersection of the power-taking shell 211 and the first connecting surface 11 is the same, that is, the connection between the power-taking shell 211 and the first connecting surface 11 fits together, so that the power-taking plug 21 and the first connecting surface 11 can be connected together. The connection of the first connecting surface 11 is tighter and tighter, the installation is more compact, and it is also more convenient and firm.

Preferably, as shown in Figure 4, the power-taking housing 211 includes a sliding cover 216, the sliding cover 216 is opposite to the spring power-taking probe 213 and is slidably installed on the power-taking housing 211, when a problem occurs, the sliding cover 216 can be Slide open, the plug board 212 is taken out for inspection and maintenance. Preferably, as shown in FIG. 6, the metering housing 221 includes a first housing 2217 and a second housing 2218, the first housing 2217 and the second housing 2218 are detachable independent structures, and the first housing 2217 and the second housing 2218 are The connection surface of the second housing 2218 is parallel to the wedging surface 2213, which also facilitates the disassembly and maintenance of the circuit board. In a preferred embodiment, the plug 2214 of the wedging surface 2213 includes a variety of structures to match different miniature circuit breakers 1, and the contour of the intersection of the wedging surface 2213 and the second connection surface 12 is the same, namely The wedging surface 2213 fits with the joint of the second connection surface 12, so that the micrometer 2 can be matched with different miniature circuit breakers 1, and the application range is wider and the installation is more convenient.

As shown in Figure 10, in one embodiment, the metering unit includes a step-down module, a conversion module, a CPU operation processing module, a storage module, a communication module, and a power supply module; the electrical signal of the power-taking plug 21 is transmitted after being processed by the step-down module To the conversion module, the conversion module is electrically connected to the CPU operation processing module, and the CPU operation processing module is also electrically connected to the storage module, the communication module and the power supply module, and the power supply module supplies power to the communication module and the CPU operation processing module. The whole process is as follows: after the electrical signal of the power-taking plug 21 is processed by the front-end of the three-phase voltage and the three-phase current CT signal is processed in the step-down module, it is transmitted to the conversion module, and the electrical signal is converted from a continuous analog signal to a discrete digital signal, and transmit the converted digital signal to the CPU operation processing module for calculation and processing, the processed data is stored in the memory for information storage, and the RS-485 bus connected through the isolated 485 communication interface, the processed The electrical signal will be transmitted to an external device to be checked by people. The rectified DC power output on the plug board 212 is in the range of 10-30V. After being stabilized by the power module, it supplies power to the 485 drive module in the communication module. The stabilized power supply continues to supply power to the CPU operation processing module after isolation. Ensure the operation of the micrometer 2.

Further, the core device of the metering unit 22 includes the AD chip CS5451A dedicated to the 6-channel 16-bit ammeter of the processing module, which is used for analog-to-digital conversion, and also includes the 32-bit ARM processor LPC2138 of the CPU operation processing module. The data rate samples the signal synchronously, and the ARM processor analyzes and calculates parameters such as voltage, current, power, electric energy, and harmonics.

Preferably, the power board includes the communication module, the power module and an isolation module, the communication module includes a 485 chip and its protection circuit and a communication port, and the power module includes a DC voltage stabilization module and a DC voltage isolation module , the isolation module is an optocoupler isolation module, which isolates the communication module from other modules; The chip and its protection circuit are electrically connected; the metering board includes the step-down module, the CPU operation processing module, the analog-to-digital conversion module, and the storage module, and the step-down module is a voltage divider network, Located at the front end of the metering board, the analog-to-digital conversion module is connected to the CPU operation processing module, and the storage module is installed beside and connected to the CPU operation processing module.

As shown in Figure 11, the PCB board of the metering board 223 includes an AD chip CS5451 and an ARM processor LPC2138. The memory chip is located next to the ARM processor LPC2138 to store data in the CPU. The voltage front-end voltage divider network is located on the entire metering board. The front end of 223 is used to divide the rectified direct current and reduce the voltage to supply the ARM processor LPC2138.

As shown in Figure 12, the PCB board of the power supply board 222 includes DCDC voltage regulation, isolated DCDC and 485 chip and protection circuit, optocoupler isolation, current input, power supply and communication port; the input of the current input part is an unrectified voltage The AC power taken out by the sampling module is supplied to the 485 chip and its protection circuit after the rectified current is stabilized by DCDC, and then supplied to the CPU processing module through isolated DCDC, that is, the above-mentioned ARM processor LPC2138. The optocoupler isolation electrically isolates the 485 module from other modules, which is safer.

In one embodiment, as shown in FIG. 7 , the power board 222 includes a step-down module, an isolation module, a conversion module, a 5V power supply and a 3.3V power supply, and the step-down module connected to the plug board 212 performs step-down processing on the power taken. , to convert higher voltage direct current into lower voltage direct current, the conversion module is electrically connected to the step-down module and the isolation module, the step-down 5V power supply and the 3.3V power supply are electrically isolated from the step-down module through the isolation module, Both the power supply and the 3.3V power supply are powered by the 485 connector seat 2233, so that there is electrical isolation between the 5V power supply after the step-down and the 3.3V power supply and the conversion module before the step-down, and there will be no electrical influence between them, which increases the power supply. The stability of the board and the stability of the DC power supplied to the 485 module 2233 of the metering board 223. The 3.3V power supply and the 5V power supply do not share the same ground, the 5V power supply is connected to GND1, and the 3.3V power supply is connected to GND. Preferably, the 485 connector base 2233 is in the form of an isolated 485 communication interface. The 485 connector base 2233 includes an isolated 485 module and a 485 drive module. The 485 module is powered by a 3.3V power supply, and the 485 drive module is powered by a 5V power supply. The way of isolation can make the two modules not interfere with each other when they are connected through the circuit, and the electricity is not connected, preventing mutual interference and damage, and increasing safety. In one embodiment, the metering board 223 also includes a virtual analog ground, that is, AGND. AGND is electrically connected to the voltage sampling unit and the transformer connector seat 2232 through a circuit. At the same time, AGND and GND are single-point common ground. It is the same as the reference voltage of GND. Since the measurement of three-phase three-wire has no neutral line N, the measurement chip lacks a reference for the voltage acquisition of three-phase three-wire. In this invention, the method of converting virtual ground AGND into real ground GND is adopted, as shown in Figure 13 The analog ground is transformed into a real circuit schematic diagram, L1 is connected to one end of the resistor R1, L2 is connected to one end of the resistor R2, L3 is connected to one end of the resistor R3, and the other ends of R1, R2, and R3 are connected together to form a three-phase three-wire midpoint. That is, the virtual ground. This midpoint is connected to the analog ground AGND of the metering chip. The analog ground AGND of the metering chip is connected to the digital ground GND of the metering chip through magnetic beads. The power supply of the metering chip uses a high-frequency transformer and the input three-phase three-wire L1 , L2, L3 full-wave rectification V+ and V- isolation, this process realizes the conversion of the virtual ground into the real ground of the metering chip reference. Preferably, the connectors between the 3.3V power supply and GND and the connectors between the 5V power supply and GND1 are pin connectors with a pitch of 2.0mm, and the transformer connector seat 2232 and the 485 connector seat 2233 are both 3.81 Spaced connector housings for easy installation.

Preferably, the transformer connector base 2232 is externally connected to an open-type current transformer. In one embodiment, three external current transformers can be connected to a three-phase three-wire miniature circuit breaker, and the current transformer can be connected with the rated current of the miniature circuit breaker. To select, the current transformer can choose through-type or open-type, choose the open-type current transformer, so that the micro-meter 2 can be added to the miniature circuit breaker 1 to achieve continuous power installation, which solves the problem that the existing miniature circuit breaker 1 cannot The installation problem in the occasion of artificial power failure.

In one embodiment, the distance between the board-to-board connector seat 2231 is 2.0 mm, the plastic height is 4.3 mm, the needle head of the board-to-board connector is 2.0 mm high, and the board distance between the metering board 223 and the power board 222 is 6.3 mm. mm, the compact distance between the boards and the height of the boards as compressed as possible can compress the height of the metering unit and reduce the volume of the micrometer 2 . Both the metering board 223 and the power board 222 have a thickness of 1.2 mm, which can meet the requirements of the use environment on the thickness of the circuit board, and the thin circuit board can also reduce the thickness of the metering unit. The smaller spacing between the boards and the slim board body can further reduce the volume of the micrometer, making it easier to install.

In one embodiment, as shown in FIG. 1 , an indicator light 23 is installed on the top of the second housing 2218 , which can reflect and indicate the power consumption status and the usage status of the ammeter itself. Preferably, the indicator light 23 is inlaid with the light guide material and the lamp housing, which can enhance the appearance and display effect, and look more attractive when used.

As mentioned above, the micrometer of the present invention is attached to the miniature circuit breaker. The micrometer includes a power-taking plug and a metering unit. The power-taking plug and the metering unit are replaceable units independent of each other, and the installation and maintenance are very convenient. The power-taking plug adopts spring thimbles to take power from the miniature circuit breaker, which is convenient and safe, and no need to provide additional power supply for the micro-meter. The power-taking plug and the metering unit are embedded and wedged with the corresponding mating surface of the miniature circuit breaker, and the installation is firm And it is easy to disassemble. The circuit board design components of the micro-meter are compact and arranged in an orderly manner. The larger capacitors and varistors are placed lying down to reduce the height of the circuit board and save space. The volume of the micro-meter is reduced as much as possible, making the meter The miniaturization is more significant, and it can be retrofitted to existing distribution boxes or distribution cabinets. The presence of the varistor can protect the subsequent circuit, improve the resistance index of the meter, and make the meter safer to use. This micrometer provides transformer interface. For three-phase three-wire miniature circuit breaker, three external current transformers can be connected. The current transformer can be selected according to the rated current of the miniature circuit breaker. In the present invention, the open-type current transformer is selected, so that the installation of the micro-meter to the micro-circuit breaker can realize continuous power installation, which solves the installation problem that the existing micro-circuit breaker cannot be artificially cut off. The whole micrometer is small and exquisite, easy to install, and the safety is greatly improved.

The present invention has been described by the above-mentioned related embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention all belong to the scope of patent protection of the present invention.

Claims (10)

1. a kind of micro- ammeter, which is characterized in that micro- ammeter be attached on the miniature circuit breaker and with the miniature open circuit It is mechanically connected between device, micro- ammeter includes power taking plug and metering units, and the power taking plug is plugged on miniature circuit breaker On take electricity from the binding post lock screw of miniature circuit breaker, and power to the metering units.

2. a kind of micro- ammeter as described in claim 1, which is characterized in that the miniature circuit breaker includes the first joint face, the Two joint faces and binding post lock screw, first joint face is connected and is mutually perpendicular to second joint face, described Binding post lock screw is set on first joint face, and the power taking plug is plugged on the binding post lock screw, The metering units are mounted on second joint face, the power taking plug and the metering units be it is mutually independent can Dismantling connection mode.

3. a kind of micro- ammeter as claimed in claim 2, which is characterized in that the power taking plug is detachably connected to described the On one joint face, the power taking plug includes that electric shell, patchboard, spring is taken to take electric probe, the first electric connector and positioning Slot；The patchboard is embeddedly fastened on the inside for taking electric shell, and the spring takes electric probe to be electrically connected with described first It connects device to be welded on the patchboard, the spring takes electric probe and first electric connector both passes through and described takes electric shell The outside for taking electric shell is reached, and the spring takes electric probe to be resisted against the binding post locking screw correspondingly On silk, the spring takes electric probe and first electric connector to be located at the two adjacent sides for taking electric shell On, the locating slot is arranged among two adjacent the first electric connectors, and is located at face where first electric connector Bottom end；

The metering units are removably attachable to second joint face, and the metering units include measuring shell, power panel, Metering plate, 485 interfaces, transformer interface and the second electric connector；The metering shell includes convex surface, concave surface and wedging Face, the convex surface and the concave surface are parallel to each other, and 485 interface and the transformer interface are provided with the concave surface side by side On, the wedging face is opposite with the concave surface, and the wedging face and the second joint face phase wedging；On the wedging face It is wholely set plug and postive stop baffle, the plug intercalation is in the jack on second joint face, to keep off described The postive stop baffle intercalation of the two sides of second joint face is in the corresponding slot in second joint face two sides；The electricity Source plate and the metering plate are fastened on the inside of the metering shell, and the metering plate includes board to board connector seat, mutual inductance One end of device connector holder and 485 connector holders, the power panel is equipped with board to board connector head；The mutual inductor connector Seat and 485 connector holders are mounted side by side on one end of the metering plate, and closely the mutual inductor connects the board to board connector seat Device seat and 485 connector holder are connect, by the way that the board to board connector head is embedding between the power panel and the metering plate The mode being inserted in the board to board connector seat is fixedly connected, the metering plate and the power panel with the convex surface and The concave surface is parallel, and the mutual inductor connector holder on the metering plate is each passed through described mutual with 485 connector holder Sensor interface and 485 interface, stretch out the metering shell；Second electric connector welding is on the power panel and wears Cross it is described metering shell reach it is described metering shell outside, second electric connector be located at the wedging face just on Side, second electric connector are connected in a manner of plugging with first electric connector；

When the power taking plug is connected with the miniature circuit breaker, the spring takes electric probe to be resisted against institute correspondingly It states on binding post lock screw and is electrical connected therewith, the spring takes electric probe to take electricity from the miniature circuit breaker simultaneously And first electric connector is transferred to by variable voltage and variable current by the patchboard；When wedging face intercalation is described second When on joint face, the metering units link together with the miniature circuit breaker, and first electric connector with it is described Second electric connector is connected by way of plug, and the power taking plug is clipped in the miniature circuit breaker and the metering units Centre, the electricity that the power taking plug is obtained from the miniature circuit breaker by connected first electric connector with it is described Second electric connector supplies the metering units.

4. a kind of micro- ammeter as claimed in claim 3, which is characterized in that the patchboard includes varistor module, all-wave Rectification module and voltage sampling module；The varistor module takes electric probe to be electrical connected with the spring, to protect Late-class circuit, the full-wave rectification block are connected with the varistor module, defeated to carry out full-wave rectification to institute's obtaining current Direct current out, the voltage sampling module are connected by circuit with the metering plate.

5. a kind of micro- ammeter as claimed in claim 4, which is characterized in that the power taking plug includes bottom plate and riser, described Bottom plate is mutually perpendicular to the riser, and the varistor module includes varistor and diode；The varistor welding Electric probe is taken to be generally aligned in the same plane on the patchboard and with the spring, the welding diode is in the varistor The back side, the pressure-sensitive electricity is sleeping to be lain on the riser, and the diode is sleeping to be lain on the bottom plate；The voltage sampling module Including resistor network, the resistor network is divided into 3 groups, wherein resistor network described in 2 groups is welded on the riser, described in 1 group Resistor network is welded on the bottom plate；The varistor is high energy 10D471 varistor, and the diode is pressure resistance 3,000 The kenotron R3000 of volt, safe distance is greater than 4 millimeters between the cabling of the patchboard；Described 3 groups for decompression Resistor network respectively corresponds the voltage sampling of phase three-wire three, and 3 groups of resistor networks are directly welded on the metering plate, The positive and negative anodes of the DC voltage exported after the full-wave rectification block rectification are directly welded on the power panel.

6. a kind of micro- ammeter as described in claim 1, which is characterized in that the height of micro- ammeter is not more than 32 millimeters, institute The thickness of micro- ammeter is stated no more than 25 millimeters, the width of micro- ammeter is 18 millimeters, and the width of micro- ammeter is not more than institute State the width of miniature circuit breaker.

7. a kind of micro- ammeter as claimed in claim 3, which is characterized in that the spring taken on electric shell takes electric probe Place includes the round deck of integrated injection molding, the circle deck be to the round deck for taking electric interior of shell to be recessed, The interior diameter of the circle deck is identical as the overall diameter of the binding post lock screw, the circle deck and the binding post Lock screw corresponds；The center of the circle deck is fixed with probe set, and the probe set and the spring take electric probe Material is identical, and the spring takes electric probe to connect across the probe set with the binding post lock screw；When the spring takes Electric probe passes through the probe set, the patchboard be embedded in therewith the first shell support it is swollen it is described take electric shell, to block Gu being taken in electric shell described；It is described to take electric shell identical with the profile of first joint face intersection, i.e., it is described to take outside electricity The junction of shell and first joint face fits, and described to take electric shell include slip lid, and the slip lid and the spring take electricity Probe is opposite and is slidably mounted on described take on electric shell；The metering shell includes first shell and second shell, institute First shell and the second shell are stated as separable absolute construction, and the company of the first shell and the second shell Junction is parallel to the wedging face；The plug in the wedging face includes various structures, to from different miniature circuit breaker phases Match, and the wedging face is identical as the profile of second joint face intersection, i.e., the described wedging face is connect with described second The junction in face fits.

8. a kind of micro- ammeter as claimed in claim 3, which is characterized in that the metering units include voltage reduction module, modulus turn Change the mold block, CPU calculation process module, memory module, communication module and power module；The electric signal of the power taking plug passes through The conversion module, the analog-to-digital conversion module and CPU calculation process module electricity are transferred to after the voltage reduction module processing Property be connected, the CPU calculation process module also with the memory module, the communication module and the power module respectively electricity Property be connected, the power module is to the communication module and the CPU calculation process module for power supply；The power panel includes institute Communication module, the power module and isolation module are stated, the communication module includes 485 chips and its protection circuit and leads to Mouth is interrogated, the power module includes DC voltage-stabilizing module and DC voltage isolation module, and the isolation module is light-coupled isolation Module is isolated by communication module with other modules, the DC voltage-stabilizing module and the 485 protection chip and its protection circuit phase It powers even and for it, the communication port is electrical connected with the 485 protection chip and its protection circuit；The metering plate includes institute State voltage reduction module, the CPU calculation process module, the analog-to-digital conversion module and the memory module, the voltage reduction module For potential-divider network, positioned at the front end of the metering plate, the analog-to-digital conversion module is connected with the CPU calculation process module, institute Memory module is stated to be mounted on by the CPU calculation process module and be attached thereto.

9. a kind of micro- ammeter as claimed in claim 3, which is characterized in that the power panel include voltage reduction module, isolation module, Conversion module, 5V power supply and 3.3V power supply, the voltage reduction module being connected with the patchboard carry out at decompression taken electricity Reason, the conversion module are connected with the voltage reduction module and the isolation module, the 5V power supply after decompression and 3.3V power supply It is isolated by the isolation module with the voltage reduction module, the 5V power supply and the 3.3V power supply are 485 connector Seat power supply；Not altogether, the 5V power supply meets GND1 by pin connector, described for the 3.3V power supply and the 5V power supply 3.3V power supply meets GND by pin connector；485 connector holder is described using the form that 485 communication interfaces are isolated 485 connector holders include 485 modules and 485 drive modules of isolation, and 485 module is by 3.3V power supply power supply, and described 485 Drive module is by 5V power supply power supply；The metering plate further includes virtual simulation, and the simulation ground passes through circuit and the electricity Sampling unit and the mutual inductor connector holder is pressed to be electrically connected, while simulation ground and the GND single-point are altogether；It is described mutual The external open type current transformer of sensor connector holder.

10. a kind of micro- ammeter as claimed in claim 3, which is characterized in that be equipped with indicator light at the top of the second shell； The indicator light is inlayed using optical material and lamp housing.