CN210742357U - Three-phase three-wire intelligent circuit breaker - Google Patents
Three-phase three-wire intelligent circuit breaker Download PDFInfo
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- CN210742357U CN210742357U CN201920714253.3U CN201920714253U CN210742357U CN 210742357 U CN210742357 U CN 210742357U CN 201920714253 U CN201920714253 U CN 201920714253U CN 210742357 U CN210742357 U CN 210742357U
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Abstract
The utility model provides a three-way intelligent circuit breaker of three-phase, including miniature circuit breaker and little ammeter, little ammeter depends on miniature circuit breaker, and little ammeter is including getting electric plug and metering unit, gets the electric plug and inserts on miniature circuit breaker and get the electricity from miniature circuit breaker, gets the electric plug still and is connected through the plug between the metering unit for it is more reliable to connect, and makes things convenient for dismouting and maintenance. 3 current transformers are arranged in the metering unit, the centers of the current transformers are overlapped with the center of a wiring terminal of the miniature circuit breaker and are used for measuring three-phase current, the metering unit collects the three-phase current and three-phase voltage in a virtual ground on-site mode, and the phase failure situation cannot occur. The current transformer adopts small-size current transformer to adopt built-in structure, make the outward appearance more pleasing to the eye clean and tidy, and safer and not fragile, can prolong intelligent circuit breaker's life.
Description
Technical Field
The utility model relates to an electric power system equipment technical field especially relates to a three-way intelligent circuit breaker of three-phase.
Background
The miniature circuit breaker is widely used in various fields because of its small size, convenience and intelligentized function. However, at present, circuit breakers used by urban power grids, industrial and mining enterprises and common household power grids are still non-intelligent circuit breakers and still stay in a 'dumb equipment' stage. Therefore, for a long period of time, the electric power companies and industrial and mining enterprises need to replace the production and living electric power equipment or the traditional circuit breaker completely in large quantities, which is very high in cost and brings great inconvenience to the production and living of the industrial and mining enterprises and residents.
On the basis of the original circuit breaker and distribution box, a data acquisition component and a control component are additionally arranged with low cost, convenience, firmness and no occupied space, and a power supply of the data acquisition component and the control component is not required to be additionally provided, so that the problem of great value and innovation is urgently needed to be solved. What is needed is a micro-meter which can be conveniently installed on a circuit breaker, can measure voltage, current, frequency, power and electricity degree data, manage and store the data, and interact with external terminal equipment. The external terminal equipment can be a computer, a mobile phone and other terminals, and data are displayed through the external terminal equipment.
As an electric meter for calculating the electric power, only 2 transformers are used, but the circuit breaker has a protection function, and the voltage and the current of each line need to be measured. The measurement of each line is easy to judge faults such as phase failure, which is not allowed for three-phase motor load, and the motor phase failure operation can cause accidents.
The three-phase asynchronous motor is widely applied in industrial production, but the three-phase alternating current motor has more burning accidents caused by phase-lacking operation in production, and therefore, the snared economic loss is caused to enterprises. The motor current can be changed due to the phase-lack operation of the motor; when the motor is out of phase in operation,
1. when the motor is in full load, the motor is in an overcurrent state, namely the current exceeds the rated current, the surface of the motor has large noise, the rotating speed is rapidly reduced and is powerless, and the temperature of the motor rapidly rises to cause the motor to be burnt.
2. When the motor is in phase failure in light load operation, the motor can continue to operate for a period of time due to the action of inertia, but the rotating speed is low, and the winding current of the uninterrupted phase is rapidly increased, so that the winding of the phase is burnt out due to overhigh temperature rise.
3. Phase loss during starting: the rotor swings left and right, strong hum is generated, the motor cannot be started, the current is 4-7 times of rated current, and the temperature of the motor is rapidly increased to burn the motor.
4. When the motor has a phase disconnection, the following consequences can occur:
1) the motor can not normally run, so that the insulation is reduced due to overhigh temperature rise, and the service life of the motor is shortened;
2) the motor can be burnt out due to the fact that insulation is burnt out when the motor is not powered off in a short time;
3) the broken line point is electrified to easily cause electric shock or casualty accidents.
Therefore, a three-phase three-wire intelligent circuit breaker is needed, an electric meter is additionally arranged, and compared with a common electric meter, the three-phase three-wire intelligent circuit breaker can solve the problem of measuring three-phase current and avoid phase loss.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the shortcoming that exists among the prior art, and the three-way intelligent circuit breaker of three-phase that proposes.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a three-way intelligent circuit breaker of three-phase, includes miniature circuit breaker and little ammeter, little ammeter depends on miniature circuit breaker is last, little ammeter is including getting electric plug and measurement unit, it inserts to get the electric plug miniature circuit breaker is last and follow get the electricity on the miniature circuit breaker, get the electric plug still with connect through the plug between the measurement unit, 3 current transformer are put into the measurement unit, current transformer's center with miniature circuit breaker's terminal center coincidence is used for measuring three phase current, three phase current and three phase voltage are gathered through the mode of virtual ground on the spot to the measurement unit.
Preferably, get the electric plug including getting electric contact pin and measurement contact pin, get the electric contact pin and insert on miniature circuit breaker and follow get the electricity on the miniature circuit breaker, the measurement contact pin is inserted on the measurement unit.
Preferably, the quantity of getting the electric contact pin is 3, the quantity of measurement contact pin is 5, 5 in the measurement contact pin 2 be used for will follow send full wave rectification output to behind the voltage process EMC circuit protection that gathers on the miniature circuit breaker to the measurement unit, remaining 3 the measurement contact pin is used for will follow the voltage that gathers on the miniature circuit breaker is exported after voltage conditioning to the measurement unit.
Preferably, the current transformers are straight-through current transformers, 3 current transformers are arranged below the metering unit, and the centers of the current transformers coincide with the center of a binding post of the miniature circuit breaker.
Preferably, a mutual inductance shell is arranged outside the current transformer, the mutual inductance shell is composed of 3 cylindrical shells with coil blocks, the current transformer is embedded into the mutual inductance shell in a one-to-one correspondence mode, and the coil blocks penetrate through binding posts of the miniature circuit breaker.
Preferably, the mutual inductance housing comprises a first side face and a second side face which are opposite, the first side face is concave in the shape of an arc, the second side face is convex in the shape of an arc, and the first side face and the second side face are parallel to each other.
Preferably, the cross section of the current transformer is circular, the inner diameter of the current transformer is 12 mm, the outer diameter of the current transformer is 25 mm, and the height of the current transformer is 10 mm.
Preferably, the electricity taking plug is used for taking electricity and rectifying, the metering unit comprises a switch power supply module and a current conditioning module, the switch power supply module is connected with a rectifying circuit inside the electricity taking plug, the switch power supply module is used for generating two groups of isolated power supplies and supplying power to a circuit inside the metering unit, the current transformers are connected with the current conditioning module, and the current conditioning module is used for converting current into level and transmitting the level to the circuit inside the metering unit for processing.
Preferably, two isolated power supplies generated by the switching power supply module are 5V GND1 and 3.3V GND respectively, the current conditioning module is connected with the 3 metering pins of the power taking plug to form a three-phase load circuit, and a virtual ground of the three-phase load circuit is connected with the GND, namely the virtual ground of the metering unit is realized.
Preferably, the three-phase three-wire intelligent circuit breaker is interacted with an external terminal device through the metering unit in the micro-electricity meter, and the external terminal device is a computer or a mobile phone.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a pair of three-way three-wire intelligent circuit breaker of three-phase comprises the micro-ammeter that miniature circuit breaker depends on miniature circuit breaker, and wherein miniature circuit breaker is including getting electric plug, measurement unit, wherein gets between electric plug and miniature circuit breaker and the measurement unit all to be connected through the contact pin plug, gets the electric plug and relies on the measurement unit plug for it is more reliable to get electricity and be connected with the measurement unit from miniature circuit breaker, and make things convenient for dismouting and maintenance. The current transformer is small in size and is arranged in the lower portion inside the metering unit, three-phase current can be measured, the three-phase current can be measured through a virtual ground method, and the condition of phase failure cannot occur. The built-in structure of current transformer for the outward appearance is more pleasing to the eye clean and tidy, and compare in the external mounting means of mutual-inductor, the mutual-inductor is built-in safer and not fragile, can prolong the life of little ammeter to a certain extent, reduces the maintenance number of times. The current transformer can carry out the measurement of electric current, can realize the management and the storage of other data such as electric current and voltage with the metering module cooperation to can interact with external terminal equipment, the user can directly look over ammeter data through cell-phone computer etc. convenient and practical.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a three-phase three-wire intelligent circuit breaker;
FIG. 2 is a schematic diagram of the overall structure of a micro-meter;
FIG. 3 is a schematic diagram of the internal structure of the disassembled micro-meter;
fig. 4 is a schematic circuit diagram of a miniature circuit breaker.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Please combine and refer to fig. 1 to fig. 4, the utility model provides a three-way three-wire intelligent circuit breaker of three-phase, including miniature circuit breaker 3 and little ammeter, as shown in fig. 1, little ammeter depends on miniature circuit breaker 3, little ammeter is including getting electric plug 1 and metering unit 2, get electric plug 1 and insert on miniature circuit breaker 3 and get the electricity from miniature circuit breaker 3, get electric plug 1 still and be connected through the plug between the metering unit 2, metering unit 2 embeds 3 current transformer 21, current transformer 21's center and miniature circuit breaker 3's terminal center coincidence are used for measuring three phase current, metering unit 2 gathers three phase current and three phase voltage through the mode of virtual ground on the spot.
As shown in fig. 2 and 3, the micro-meter of the present invention is divided into two parts, each part has a definite function, and the electricity taking plug 1 is used for taking electricity from the micro-breaker 3 and rectifying the taken alternating current to supply power to the metering unit 2; the metering unit 2 is used for performing management operations such as calculation, storage, communication and the like, and storing and managing current, voltage, frequency, power, electricity degree data and the like. The design and the structure are convenient to install additionally, the functional modules are distinguished obviously, and the maintenance is convenient when the fault occurs. The current transformer 21 is a small-sized current transformer 21 and is built in the lower part of the metering unit 2, so that three-phase current can be measured, and the three-phase current can be measured by a virtual grounding method without phase loss. In addition, place little ammeter in the current transformer 21 in, compare with the external structure of mutual-inductor, the outward appearance of whole little ammeter is succinctly generous more to place little ammeter in the mutual-inductor in, protected by the shell, can reduce the risk that the mutual-inductor damaged, reduce the maintenance number of times to a certain extent, prolong the utility model discloses a life.
In one embodiment, as shown in fig. 3, the power plug 1 includes a power pin 11 and a metering pin 12, the power pin 11 is inserted into the miniature circuit breaker 3 and draws power from the miniature circuit breaker 3, and the metering pin 12 is inserted into the metering unit 2. Furthermore, the number of the power-taking pins 11 is 3, the number of the metering pins 12 is 5, 2 of the 5 metering pins 12 are used for sending the voltage collected from the micro circuit breaker 3 to the metering unit 2 after being protected by the EMC circuit, and the rest 3 metering pins 12 are used for outputting the voltage collected from the micro circuit breaker 3 to the metering unit 2 after being conditioned by the voltage. The power-taking pin 11 collects L1, L2 and L3 voltages on a three-phase circuit, and sends the voltages to a full-wave rectification output circuit after being protected by an EMC circuit, wherein the L +, L-and 2-spring probes are output; the 5 metering probes L +, L-, UA, UB and UC are butted with 5 pins of the metering unit 2. The power taking plug 1 is plugged and pulled by the metering unit 2, so that power taking from the circuit breaker is more reliable in connection with the metering unit 2, and the circuit breaker is convenient to disassemble, assemble and maintain.
Further, get electric plug 1 and connect in the inboard top of measurement unit 2 through measurement contact pin 12, current transformer 21 installs the bottom at measurement unit 2, and it is whole to be 7 fonts promptly to get electric plug 1 and miniature circuit breaker 3 between be connected the face perpendicular to measurement unit 2 and the connection face between current transformer 21 and the miniature circuit breaker 3. Get between electric plug 1, the metering unit 2 and the current transformer 21 structural connection closely, get between electric plug 1 and the metering unit 2 through the plug connection, can be through the mutual wedging between the two shells between metering unit 2 and the current transformer 21 or other modes such as welding, cementing connect closely between the triplex for the volume of little ammeter reduces as far as possible, is convenient for install on miniature circuit breaker 3 additional.
Preferably, the current transformer 21 is a feedthrough current transformer 21, and 3 current transformers 21 are disposed below the metering unit 2, the center of the current transformer 21 coinciding with the center of the terminal of the miniature circuit breaker 3. Therefore, the current transformer 21 can conveniently sense and measure the current on the terminal post, the structure is compact and attractive, and the size of the micro-ammeter is reduced as much as possible.
In another embodiment, the mutual inductance housing 22 is provided outside the current transformer 21, the mutual inductance housing 22 is composed of 3 cylindrical housings with coil stops 223, the current transformers 21 are embedded into the mutual inductance housing 22 in a one-to-one correspondence, and the coil stops 223 penetrate through the terminals of the miniature circuit breaker 3. Mutual inductance shell 22 is used for packing and protection current transformer 21, and current transformer 21 overlaps on coil check block 223, plays the effect of fixed coil to coil check block 223 separates miniature circuit breaker 3's terminal and current mutual inductor, plays the coil wearing and tearing that prevent current transformer 21 to a certain extent, the effect of protection current transformer 21.
Preferably, as shown in fig. 2 and 3, the coil housing includes a first side 221 and a second side 222, the first side 221 has a contour that is concave inward and curved, the second side 222 has a contour that is convex outward and curved, and the first side 221 and the second side 222 are parallel to each other. Because to embed current transformer 21 in little ammeter, guarantee little ammeter's volume simultaneously and be as little as possible, so the coil casing is the circular shell of in bank connection, as far as possible the same with the size of coil, but circular shell has a great deal of inconvenience when installing additional, especially under the condition that a plurality of little ammeters installed additional simultaneously, consequently make parallel arcwall face with mutual inductance shell 22's both sides, when installing additional simultaneously a plurality of like this, adjacent ammeter can splice, and can reduce as far as possible and install shared space additional. Simultaneously, because current transformer 21 will with measure to be connected through the wire between the unit 2, consequently current transformer 21's mounted position also need carry out reasonable installation to it is simple clear to walk the line in the little ammeter to guarantee, consequently based on actual design and installation situation, arrange current transformer 21 in a row to do the skew slightly with one side, and all set the cambered surface to with both sides.
Preferably, the cross section of the current transformer 21 is circular, the inner diameter of the current transformer 21 is 12 mm, the outer diameter of the current transformer 21 is 25 mm, and the height of the current transformer 21 is 10 mm. The current transformer 21 with the volume as small as possible is selected under the condition of actual current requirements of the micro-ammeter, so that the volume of the micro-ammeter can be further reduced, and the micro-ammeter is convenient to install.
As shown in fig. 4, the power-taking plug 1 is used for taking and rectifying power, the metering unit 2 includes a switching power supply module and a current conditioning module, the switching power supply module is connected with a rectifying circuit inside the power-taking plug 1, the switching power supply module is used for generating two groups of isolated power supplies and supplying power to a circuit inside the metering unit 2, the current transformers 21 are connected with the current conditioning module, and the current conditioning module is used for converting current into level and transmitting the level to the circuit inside the metering unit 2 for processing. Furthermore, two isolated power supplies generated by the switching power supply module are 5V GND1 and 3.3V GND respectively, the three-phase load circuit is connected with the 3 metering pins 12 of the power taking plug 1 before the current conditioning module, and the virtual ground of the three-phase load circuit is connected with the GND, namely the virtual ground of the metering unit 2 is realized.
As shown in fig. 4, the utility model provides a three-way intelligent circuit breaker of three-phase, wherein little ammeter is including getting electric plug 1 and metering unit 2. The power taking plug 1 comprises an EMC filter and a rectifying circuit, after three-phase power is taken from the miniature circuit breaker 3, the power taking plug 1 converts the obtained alternating current into direct current through the filtering of the EMC filter and the rectifying circuit, and the direct current is supplied to the metering unit 2 through two metering pins 12. The three-phase voltage obtained by the power taking plug 1 from the miniature circuit breaker 3 is conditioned by the voltage conditioning module and then is transmitted to the metering unit 2 through the remaining three metering contact pins 12 for voltage data processing. The metering unit 2 comprises a switch power supply module, a current conditioning module, a three-phase metering chip, a microprocessor and a communication module, wherein the switch power supply module is connected with the output end of a rectifying module in the power taking plug 1, the switch power supply module converts rectified rated direct current into 2 groups of isolated power supplies, namely 5V GND1 and 3.3V GND respectively, the 5V GND1 is used for driving an external interface of the communication module, the 3.3V GND is used for driving the three-phase metering chip, the microprocessor and the communication module, and the voltage conditioning module and the current conditioning module are connected with the three metering chips and respectively generate storage batteries which can be matched with the three-phase metering chips; the voltage conditioning module directly takes voltage signals from a three-phase power supply and transmits the taken voltage signals to the three-phase metering chip for processing, the current conditioning module is connected with the mutual inductor module, and the current conditioning module transmits current signals received from the mutual inductor module to the three-phase metering chip for processing. The three-phase metering chip converts, calculates and stores data such as voltage, current, frequency, power, electric power and the like. The inside of the metering unit 2 is connected with three metering contact pins 12 to form a three-phase circuit, UA of the metering unit 2 is connected with one end of R1, and the other end of R1 is respectively connected with one end of R2 and a 3-phase metering chip; UB is connected with one end of R3, and the other end of R3 is respectively connected with one end of R4 and the 3-phase metering chip; UC is connected with one end of R5, and the other end of R5 is respectively connected with one end of R6 and the 3-phase metering chip; the other ends of R2, R4, and R6 are connected together to form a virtual ground (midpoint), and the GND connection that is virtually isolated from the switching power supply is connected to virtually form a ground. The current of the collected L1, L2 and L3 is sent to a 3-phase metering chip through current conditioning by adopting small-sized 3 current mutual inductors and being arranged in the metering unit 2. The 3-phase metering chip collects the voltage and current of 3-phase L1, L2 and L3, and can monitor the voltage and current changes of 3-phase L1, L2 and L3 in real time.
Preferably, the three-phase three-wire intelligent circuit breaker interacts with an external terminal device through a metering unit 2 in the micro-ammeter, and the external terminal device is a computer or a mobile phone. An RS485 communication module is arranged in the metering unit 2, and an external interface in the communication module can interact with external terminal equipment, so that the transmission of information and data and the display on the external terminal are realized
From top to bottom, the utility model provides a pair of three-way intelligent circuit breaker of three-phase comprises the little ammeter that miniature circuit breaker depends on miniature circuit breaker, and wherein miniature circuit breaker is including getting electric plug, measurement unit, wherein gets all to be connected through the contact pin plug between electric plug and miniature circuit breaker and the measurement unit, gets the electric plug and relies on the measurement unit plug for it is more reliable with the measurement unit connection to get electricity from the circuit breaker, and make things convenient for dismouting and maintenance. The current transformer is small in size and is arranged in the lower portion inside the metering unit, three-phase current can be measured, the three-phase current can be measured through a virtual ground method, and the condition of phase failure cannot occur. The built-in structure of current transformer for the outward appearance is more pleasing to the eye clean and tidy, and compare in the external mounting means of mutual-inductor, the mutual-inductor is built-in safer and not fragile, can prolong the life of little ammeter to a certain extent, reduces the maintenance number of times. The current transformer can carry out the measurement of electric current, can realize the management and the storage of other data such as electric current and voltage with the metering module cooperation to can interact with external terminal equipment, the user can directly look over ammeter data through cell-phone computer etc. convenient and practical.
The present invention has been described in relation to the above embodiments, which are only examples for implementing the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, all changes and modifications which do not depart from the spirit and scope of the present invention are deemed to fall within the scope of the present invention.
Claims (10)
1. The utility model provides a three-way intelligent circuit breaker of three-phase, its characterized in that, includes miniature circuit breaker and little ammeter, little ammeter depends on miniature circuit breaker is last, little ammeter is including getting electric plug and metering unit, it inserts to get the electric plug miniature circuit breaker is last and follow get the electricity on the miniature circuit breaker, get the electric plug still with connect through the plug between the metering unit, metering unit embeds 3 current transformer, current transformer's center with miniature circuit breaker's terminal center coincidence is used for measuring three phase current, three phase current and three phase voltage are gathered through the mode of virtual ground ization to the metering unit.
2. The three-phase three-wire intelligent circuit breaker according to claim 1, wherein the electricity taking plug comprises an electricity taking pin and a metering pin, the electricity taking pin is inserted on the miniature circuit breaker and takes electricity from the miniature circuit breaker, and the metering pin is inserted on the metering unit.
3. The three-phase three-wire intelligent circuit breaker according to claim 2, wherein the number of the electricity-taking pins is 3, the number of the metering pins is 5, 2 of the 5 metering pins are used for sending the voltage collected from the miniature circuit breaker to the metering unit after being protected by an EMC circuit, and outputting the voltage collected from the miniature circuit breaker to the metering unit after being conditioned by the voltage, and the remaining 3 metering pins are used for outputting the voltage collected from the miniature circuit breaker to the metering unit after being conditioned by the voltage.
4. Three-phase three-wire intelligent circuit breaker according to claim 1, characterized in that said current transformers are of the feedthrough type and 3 of said current transformers are arranged below said metering unit, the centers of said current transformers coinciding with the centers of the terminals of said miniature circuit breaker.
5. A three-phase three-wire intelligent circuit breaker according to claim 1, characterized in that a mutual inductance housing is provided outside the current transformer, the mutual inductance housing is composed of 3 cylindrical housings with coil blocks, the current transformers are embedded into the mutual inductance housing in a one-to-one correspondence, and the coil blocks pass through the terminals of the miniature circuit breaker.
6. The three-phase three-wire smart circuit breaker of claim 5, wherein the mutual inductance enclosure includes opposing first and second sides, the first side being inwardly concave and arcuate in profile, the second side being outwardly convex and arcuate in profile, and the first and second sides being parallel to each other.
7. The three-phase three-wire intelligent circuit breaker according to claim 4, wherein the cross-section of the current transformer is circular, the inner diameter of the current transformer is 12 mm, the outer diameter of the current transformer is 25 mm, and the height of the current transformer is 10 mm.
8. The three-phase three-wire intelligent circuit breaker according to claim 2, wherein the power-taking plug is used for taking and rectifying power, the metering unit comprises a switching power supply module and a current conditioning module, the switching power supply module is connected with the rectifying circuit inside the power-taking plug, the switching power supply module is used for generating two groups of isolated power supplies and supplying power to the circuit inside the metering unit, and the current transformers are connected with the current conditioning module.
9. The three-phase three-wire intelligent circuit breaker as claimed in claim 8, wherein the two isolated power sources generated by the switching power supply module are 5V GND1 and 3.3V GND, respectively, the current conditioning module is previously connected with the 3 metering pins of the power-taking plug is a three-phase load circuit, and the virtual ground of the three-phase load circuit is connected with the GND, namely the virtual ground of the metering unit is realized.
10. The three-phase three-wire smart circuit breaker of claim 1, wherein the three-phase three-wire smart circuit breaker interacts with an external terminal device through the metering unit in the micro-meter, wherein the external terminal device is a computer or a mobile phone.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920714253.3U CN210742357U (en) | 2019-05-18 | 2019-05-18 | Three-phase three-wire intelligent circuit breaker |
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| CN201920714253.3U CN210742357U (en) | 2019-05-18 | 2019-05-18 | Three-phase three-wire intelligent circuit breaker |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118884A (en) * | 2019-05-18 | 2019-08-13 | 南京觅丹电子信息有限公司 | A kind of phase three-wire three intelligent breaker |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118884A (en) * | 2019-05-18 | 2019-08-13 | 南京觅丹电子信息有限公司 | A kind of phase three-wire three intelligent breaker |
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