CN216389228U - Switching device and photovoltaic grid-connected power distribution system - Google Patents
Switching device and photovoltaic grid-connected power distribution system Download PDFInfo
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- CN216389228U CN216389228U CN202123075728.5U CN202123075728U CN216389228U CN 216389228 U CN216389228 U CN 216389228U CN 202123075728 U CN202123075728 U CN 202123075728U CN 216389228 U CN216389228 U CN 216389228U
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- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 description 1
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model discloses a switch device, comprising an insulating shell and a circuit breaker with electric operation, wherein the insulating shell comprises an integrated or split multipole wire holder, at least one current collector, a voltage collector, an electronic controller and a communication module are arranged on the multipole wire holder, wiring terminals at two sides of the switch device are respectively and directly or indirectly connected to a low-voltage distribution network side and a photovoltaic grid-connected inverter side, the electronic controller receives and converts sampling signals of the voltage collector, and obtains an analysis result through the analysis and calculation of a microprocessor of the electronic controller, compares the analysis result with a preset threshold value to judge whether to drive the circuit breaker to perform the island protection action, when the analysis result is larger than or smaller than the preset threshold value, a driving signal is sent out to drive the breaker to open or trip, therefore, the execution of the anti-islanding protection action is realized, and the damage of the user side electric equipment caused by the unbalanced voltage of the low-voltage distribution network side and the photovoltaic inverter side is effectively prevented.
Description
Technical Field
The utility model relates to the technical field of photovoltaic grid-connected power distribution, in particular to a switching device and a photovoltaic grid-connected power distribution system.
Background
With the release of the double-carbon target, the new energy power generation industry is developing again and again. Especially, the photovoltaic power generation industry with a great proportion realizes the leap-type development again on the installed capacity. Photovoltaic modules, photovoltaic inverters, grid-connected modules and the like applied to photovoltaic power generation are further developed. When the photovoltaic power generation system is in grid-connected operation with the power distribution network, if the power distribution network has a power supply fault or is overhauled due to power failure, the photovoltaic power generation system and the load end form an island which cannot supply power, so that the user equipment is damaged, the user side is prevented from being damaged, and the problem to be solved in the field of photovoltaic grid connection is solved urgently.
In addition, because the photovoltaic grid-connected switch has a single function and does not have an electrical isolation function, an isolating switch is additionally arranged according to maintenance requirements. Secondly, because the traditional grid-connected switch is usually arranged on a main circuit of the electric energy meter close to the power grid side or the user side, the protection action aiming at the photovoltaic grid-connected power generation series can influence the electricity utilization, so that great inconvenience is caused. Thirdly, the service body of the power grid hopes to finely monitor the quality of the distributed power generation grid connection, and the traditional grid connection switch only has simple functions and is far from meeting the new requirements.
SUMMERY OF THE UTILITY MODEL
Based on the above background, the present invention provides a method for effectively overcoming at least one of the above problems by setting a voltage collector, and comparing the voltage information received from the voltage collector with a preset threshold value to determine whether to drive a circuit breaker for island protection.
The technical scheme of the utility model is as follows:
on one hand, the utility model provides a switch device, which comprises an insulating shell and a circuit breaker with electric operation, wherein the insulating shell comprises an integrated or split multipole wire holder, at least one current collector, a voltage collector, an electronic controller and a communication module are arranged on the multipole wire holder, the current collector is arranged between the circuit breaker and the multipole wire holder and is arranged corresponding to a wiring terminal of the multipole wire holder, wiring terminals at two sides of the switch device are respectively and directly or indirectly connected to a low-voltage distribution network side and a photovoltaic grid-connected inverter side, the electronic controller receives and converts sampling signals of the voltage collector, obtains an analysis result through analysis and calculation of a microprocessor of the electronic controller, compares the analysis result with a preset threshold value and judges whether to drive the circuit breaker to perform island protection action or not, and when the analysis result is greater than or less than the preset threshold value, a driving signal is sent out to drive the circuit breaker to open or release, so that the anti-islanding protection action is executed.
Preferably, the analysis result includes at least one of a voltage amplitude swing, a voltage phase swing, a voltage frequency swing, and a voltage waveform distortion rate swing.
Preferably, the circuit breaker is a molded case circuit breaker or a micro circuit breaker.
Preferably, the switching device is further provided with a metering module.
Preferably, the switching device further comprises a power supply module, and the electronic controller or/and the power supply module or/and the communication module are arranged on the left side or the right side of the circuit breaker.
Preferably, the circuit breaker is unplugged or wired to the multipole wire holder.
Preferably, insulating housing still including locating the face lid on multipolar connection base upper portion, multipolar connection base with set up a micro-gap switch between the face lid, micro-gap switch with electronic controller connects, works as when the face lid is pulled down, releases micro-gap switch, micro-gap switch sends the signal and gives electronic controller, electronic controller sends the dropout order and makes the circuit breaker separating brake.
Preferably, the circuit breaker is integrally removable from the multipolar wire holder, the end of the inlet or/and outlet end of the multipolar wire holder protruding into the internal space of the multipolar wire holder.
Preferably, the circuit breaker further comprises an actuator, an operating mechanism, a moving contact, a fixed contact and a motor, wherein the motor drives the actuator to control the operation mechanism to perform an incoming line switching-off or switching-on action.
Preferably, the current collector is arranged on a conductive path formed by electrically connecting the incoming line end, the outgoing line end and the breaker.
Preferably, the communication module is connected with the electronic controller, and the current collector collects current information on the conductive path, transmits the current information to the electronic controller for current, power, coulometry and harmonic analysis, and transmits the current information to the platform area terminal, the collector or the main station through the communication module.
Preferably, the electronic controller performs power quality protection judgment according to the acquired and calculated current and harmonic information, controls an actuator of the circuit breaker to act, and drives an operating mechanism of the circuit breaker to trip, so that the separation of a fixed contact and a moving contact of the circuit breaker is realized.
Preferably, the circuit breaker includes incoming line terminal and outlet terminal, the incoming line terminal with the incoming line end is arranged side by side from top to bottom or left and right sides, the outlet terminal with the outlet terminal is arranged side by side from top to bottom or left and right sides, still be provided with on the circuit breaker and be used for pressing from both sides the clamping device of incoming line terminal and incoming line end, outlet terminal and outlet terminal.
Preferably, the insulating case further includes a face cover, the multipolar wire holder and the face cover enclosing a first chamber in which the circuit breaker is modularly installed.
Preferably, a space for accommodating the voltage collector is provided in a peripheral wall of the multipolar wire holder, and the voltage collector is provided at a terminal close to the low-voltage distribution network side.
Preferably, the voltage collector collects voltage information on the connecting line of the switching device and the low-voltage distribution network, and transmits the voltage information to the electronic controller for overvoltage protection and undervoltage protection analysis, and the electronic controller controls the actuator of the circuit breaker to act according to the voltage information to drive the operating mechanism of the circuit breaker to trip, so that the separation of the fixed contact and the movable contact of the circuit breaker is realized.
Preferably, the circuit breaker is provided with a chuck or a slotting tool, the multipole wire holder is provided with a corresponding slotting tool or chuck, and when the circuit breaker is inserted into or pulled out of the multipole wire holder, the main circuit of the multipole wire holder is switched on or off.
Preferably, the multipolar wire holder is further provided with a temperature sensor, the temperature sensor being arranged adjacent to the incoming wire end and/or the outgoing wire end.
Preferably, the multipolar wire holder is provided with a fastening device for fastening the wire inlet end or/and the wire outlet end.
Preferably, the electronic controller is arranged on the periphery of the multi-pole wire holder and avoids the positions of manual switching-on and switching-off operation and switch state display of the circuit breaker.
Preferably, the electronic controller comprises a protection circuit, a metering circuit and a power supply circuit, wherein the protection circuit, the metering circuit and the power supply circuit are respectively and independently arranged and can be arranged in a pluggable manner.
On the other hand, the utility model also provides a photovoltaic grid-connected power distribution system which comprises a photovoltaic array, a photovoltaic inverter, the switching device, an electric energy meter, a meter rear switch and a 400V power distribution network, wherein direct current electric energy generated by the photovoltaic array is transmitted to the photovoltaic inverter, the photovoltaic inverter converts the direct current electric energy into alternating current electric energy and then transmits the alternating current electric energy to the switching device, the electric energy on the 400V power distribution network is transmitted to a user for power supply after passing through the electric energy meter and the meter rear switch in sequence, and a wire outlet end of the switching device is connected to one end side of a wire inlet or one end side of a wire outlet of the meter rear switch; or the wire inlet end of the switch device is connected to the wire inlet end side or the wire outlet end side of the meter rear switch.
Preferably, the communication module communicates with the electric energy meter, the electronic controller performs difference comparison between power and electric power measurement and performs measurement misalignment determination, and transmits a determination result to the station area terminal, the collector or the master station through the communication module.
The utility model has the following beneficial effects:
1. the switching device is provided with the current collector, the voltage collector and the electronic controller, and the electronic controller receives and analyzes the voltage information transmitted by the voltage collector and then compares the voltage information with a preset threshold value to judge whether to drive the circuit breaker to perform island protection or not, so that the situation that the electric equipment of a user end is damaged due to the unbalanced voltage of the low-voltage distribution network side and the photovoltaic inverter side is prevented.
2. The switch device comprises a multi-pole wire holder and a breaker which can be detached from the multi-pole wire holder, wherein the breaker comprises an actuator, an operating mechanism, a fixed contact and a moving contact, and when the breaker is detached from the multi-pole wire holder, an obvious breakpoint of a conducting circuit can be seen on the multi-pole wire holder.
3. The outlet end of the switch device is connected to the inlet end side of the meter rear switch or the outlet end side of the meter rear switch, so that a path from the 400V power distribution network to a user is not influenced by the switch, and the normal power consumption of the user cannot be influenced after the switch protects a photovoltaic grid-connected line.
4. The switching device can meet the requirement of energy internet intelligent internet of things, and can effectively monitor, alarm and protect the electric energy quality of the photovoltaic power generation system, such as overvoltage, undervoltage, three-phase imbalance and harmonic content.
5. The switch device is provided with a microswitch, when the surface cover needs to be maintained and removed, the microswitch can send a signal to the electronic controller, and the electronic controller sends a tripping signal to trip the operating mechanism, so that the automatic power-off work is realized when the switch device is maintained, and the safety is provided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a photovoltaic grid-connected power distribution system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a photovoltaic grid-connected power distribution system according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of a switching device according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a switching device according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a multi-pole wire holder according to an embodiment of the present invention;
FIG. 6 is a longitudinal section of FIG. 5;
fig. 7 is a schematic structural diagram of a circuit breaker according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a partial structure of a circuit breaker according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a switching device according to another embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific configuration set forth below, but rather covers any modification, replacement or improvement of elements, parts or the like without departing from the spirit of the present invention. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention.
As shown in fig. 1, a photovoltaic grid-connected power distribution system according to a specific embodiment of the present invention includes a photovoltaic array 11, a photovoltaic inverter 12, a switching device 100, an electric energy meter 13, a meter rear switch 14, a low-voltage power distribution network, and a user-side load device, where the low-voltage power distribution network is a 400V power distribution network in this embodiment, the switching device 100 is disposed on an incoming line end 1401 side of the meter rear switch 14, an outgoing line end 202 of the switching device 100 is connected to the incoming line end 1401 side of the meter rear switch, and an incoming line end 201 of the switching device 100 is connected to the photovoltaic inverter 12, so that it is ensured that a path from the low-voltage power distribution network to the user-side load device is not affected by the switching device, and normal power consumption of the user-side load device is not affected after the switching device protects a photovoltaic grid-connected line.
The direct current electric energy generated by the photovoltaic array 11 is transmitted to the photovoltaic inverter 12, the photovoltaic inverter 12 converts the direct current electric energy into alternating current electric energy and transmits the alternating current electric energy to the switching device 100, and the electric energy on the 400V power distribution network is transmitted to a user side load device for power supply after passing through the electric energy meter 13 and the meter rear switch 14 in sequence.
The communication module 34 of the switch device 100 communicates with the electric energy meter 13, the electronic controller 30 performs a difference comparison between power and electric power measurements and performs a measurement misalignment determination, and further transmits a determination result to a station terminal, a collector or a master station through the communication module 34.
As shown in fig. 2, the present invention discloses a grid-connected pv power distribution system with another structure, which is different from the above embodiment in that the outlet 202 of the switch device 100 is connected to the outlet 1402 of the post-meter switch 14, so that it can also be ensured that the path from the low-voltage distribution network to the load device on the user side is not affected by the switch device, and the normal power consumption of the load device on the user side is not affected after the switch device protects the grid-connected pv line. Other structures of this embodiment are the same as those of the above embodiment, and are not described herein again.
In other embodiments, the incoming line terminal 201 of the switch device 100 may also be connected to the incoming line terminal 1401 side or the outgoing line terminal 1402 side of the watch back switch 14, and accordingly, the outgoing line terminal 202 of the switch device 100 is connected to the photovoltaic inverter.
As shown in fig. 3 to 6, the present invention discloses a switching device 100, which includes an insulating housing and a circuit breaker 10 with an electric operation, wherein the insulating housing includes an integral or separate multipolar wire holder 20, the multipolar wire holder 20 is provided with at least one current collector 31, a voltage collector 32, an electronic controller 30 and a communication module 34, the current collector 31 is disposed between the circuit breaker 10 and the multipolar wire holder 20, the current collector 31 is disposed corresponding to a terminal of the multipolar wire holder 20, the voltage collector 32 is disposed at a terminal of the switching device 100 and a low voltage distribution network side for collecting voltage information at the terminal of the low voltage distribution network side and sending the voltage information to the electronic controller 30, terminals at two sides of the switching device 100 are directly or indirectly connected to the low voltage distribution network side and the photovoltaic grid-connected inverter side respectively, the electronic controller 30 receives and converts the sampling signal of the voltage collector 32, and analyzes and calculates through a microprocessor of the electronic controller 30, to obtain analysis results of the anti-islanding protection, including but not limited to voltage amplitude swing, voltage phase swing, voltage frequency swing, and voltage waveform distortion rate swing, and compares the analysis results with a preset threshold value, to further obtain whether to perform an anti-islanding protection action, and when protection needs to be performed, that is, the analysis results are greater than or less than the preset threshold value, a driving signal is sent to drive the circuit breaker to open or release, so as to implement the execution of the anti-islanding protection action, and the preset threshold value may be a value or a range value.
In this embodiment, the voltage collector 32 is disposed near the incoming line end 201 of the multi-pole wire holder 20, and the electronic controller 30 performs island protection, overvoltage protection, undervoltage protection, and three-phase imbalance protection analysis, sends a tripping command to the actuator 101, controls the actuator 101 to operate, and further trips the operating mechanism 102, so as to separate the fixed contact 104 from the movable contact 103, and implement corresponding protection operation. The current collector 31 is disposed on a conductive path formed by connecting the line inlet terminal 201 and the line inlet terminal 105, specifically, the current collector 31 is disposed on a conductor formed by connecting the line inlet terminal 201 and the line inlet terminal 105, and is configured to collect current information of the line inlet terminal, the current collector collects current information on the conductive path of the line inlet terminal and transmits the current information to the electronic controller 30, the electronic controller 30 performs current, power, coulometry and harmonic analysis on the received current information, sends the current information to a station terminal, a collector or a main station through the communication module 34, performs power quality protection and judgment according to the collected and calculated information, such as current and harmonic, controls the actuator 101 to operate, and drives the operating mechanism 102 to trip, so as to separate the static contact 104 from the moving contact 103, and the current collector 31 is a current transformer, At least one of a shunt, a hall current sensor, a fluxgate current sensor, a rogowski coil, a magnetoresistive current sensor, and a fiber optic current sensor.
The switching device in this embodiment has functions such as anti-islanding protection, overvoltage protection, undervoltage protection, unbalanced three-phase protection, harmonic content protection, specifically, the switch device's realization mode of preventing the islanding protection function does: the voltage collector 32 collects voltage information of a line, wherein the voltage information includes amplitude, frequency, phase or waveform distortion rate of voltage, and then transmits the collected voltage information to the electronic controller 30, an analog-to-digital converter on the electronic controller 30 converts analog quantity of the collected voltage information into digital quantity, and further transmits the digital quantity to a microprocessor of the electronic controller 30, and the microprocessor performs island judgment on voltage amplitude swing or voltage frequency swing according to a preset threshold value; or the microprocessor judges islanding according to a preset threshold value range on a voltage amplitude swing range or a voltage frequency swing range, when the voltage amplitude swing or the voltage frequency swing exceeds a preset threshold value, or when the voltage amplitude swing range or the voltage frequency swing range exceeds a preset threshold value range, the islanding is judged, an islanding signal is output to transmit and control the actuator 101 to act, the operating mechanism 102 is further tripped, the operating mechanism 102 is unlocked, the four-link state is converted into the five-link state, and stored elastic potential energy is released, so that the static contact 104 and the moving contact 103 are further quickly separated, and corresponding protection action is realized. Meanwhile, the electronic controller 30 outputs data of the state quantity change and the change reason of the switching device to the communication module 34, and the communication module 34 further transmits fault study and judgment information to a terminal router or a background master station so as to realize remote monitoring.
The overvoltage protection function of the switching device is realized in the following mode: the voltage collector 32 collects voltage information of a line, and then transmits the collected voltage information to the electronic controller 30, an analog-to-digital converter on the electronic controller 30 converts an analog quantity of the collected voltage information into a digital quantity, and further transmits the digital quantity to a microprocessor of the electronic controller 30, the microprocessor judges whether the voltage of the transmitted digital signal is overvoltage or not according to a preset threshold value, if the voltage is higher than a set threshold value, the microprocessor judges that the voltage is overvoltage, and outputs an overvoltage protection driving signal, the overvoltage protection driving signal is transmitted and controls the actuator 101 to act, so that the operating mechanism 102 is further tripped, the operating mechanism 102 is unlocked, the four-link state is converted into a five-link state, and stored elastic potential energy is released, thereby further realizing the rapid separation of the static contact 104 and the moving contact 103, and realizing corresponding protection action. Meanwhile, the electronic controller 30 outputs data of the state quantity change and the change reason of the switching device to the communication module 34, and the communication module 34 further transmits fault study and judgment information to a terminal router or a background master station so as to realize remote monitoring.
The under-voltage protection function of the switching device is realized in the following mode: the voltage collector 32 collects voltage information of a line, and then transmits the collected voltage information to the electronic controller 30, an analog-to-digital converter on the electronic controller converts an analog quantity of the collected voltage information into a digital quantity, and further transmits the digital quantity to a microprocessor of the electronic controller 30, the microprocessor judges whether the voltage of the transmitted digital signal is under-voltage according to a preset threshold value, if the voltage is lower than the set threshold value, the microprocessor judges the voltage is under-voltage and outputs an under-voltage protection driving signal, the over-voltage protection driving signal transmits and controls the actuator 101 to act, so that the operating mechanism 102 is further tripped, the operating mechanism 102 is unlocked, the four-link state is converted into a five-link state, and stored elastic potential energy is released, thereby further realizing the rapid separation of the static contact 104 and the moving contact 103, and realizing corresponding protection action. Meanwhile, the electronic controller 30 outputs data of the state quantity change and the change reason of the switching device to the communication module 34, and the communication module 34 further transmits fault study and judgment information to a terminal router or a background master station so as to realize remote monitoring.
The three-phase unbalance protection function of the switching device is realized in the following mode: the voltage collector 32 collects voltage information of a line, the current collector 31 collects current information of the line, and then transmits the collected voltage information and current information to the electronic controller 30, an analog-to-digital converter on the electronic controller 30 converts analog quantity of the collected voltage information and current information into digital quantity, and further transmits the digital quantity to a microprocessor of the electronic controller 30, the microprocessor performs three-phase imbalance calculation on the voltage information and current information of the transmitted digital signal according to a preset three-phase imbalance threshold value, then determines whether the voltage information and current information exceed a three-phase imbalance threshold value, determines that the voltage information and current information are unbalanced, and outputs a three-phase imbalance protection driving signal if the voltage information and current information are unbalanced, and the three-phase imbalance protection driving signal transmits and controls the actuator 101 to act, further tripping the operating mechanism 102, unlocking the operating mechanism 102, converting from a four-link state to a five-link state, and releasing the stored elastic potential energy, thereby further realizing the rapid separation of the fixed contact 104 and the movable contact 103 and realizing the corresponding protection action. Meanwhile, the electronic controller 30 outputs data of the state quantity change and the change reason of the switching device to the communication module 34, and the communication module 34 further transmits fault study and judgment information to a terminal router or a background master station so as to realize remote monitoring.
The implementation mode of the harmonic content protection function of the switching device is as follows: the voltage collector 32 collects voltage information of a line, the voltage information comprises 2-31 times of voltage harmonics, the current collector 31 collects current information of the line, current signals at the moment at least comprise 2-31 times of current harmonics, then the collected voltage information and current information are transmitted to the electronic controller 30, an analog-to-digital converter on the electronic controller 30 converts analog quantities of the collected voltage information and current information into digital quantities and further transmits the digital quantities to a microprocessor of the electronic controller 30, the microprocessor calculates harmonic content of the transmitted voltage information and current information according to a preset harmonic content threshold value and then judges whether the harmonic content exceeds a harmonic content threshold value, if the harmonic content exceeds the set threshold value, the harmonic content is judged to be over-limited, and a harmonic content over-limit protection driving signal is output, the harmonic content overrun protection driving signal is transmitted and controls the actuator 101 to act, the operating mechanism 102 is further tripped, the operating mechanism 102 is unlocked, the four-link state is converted into the five-link state, and the stored elastic potential energy is released, so that the static contact 104 and the moving contact 103 are further quickly separated, and corresponding protection action is realized. Meanwhile, the electronic controller 30 outputs data of the state quantity change and the change reason of the switching device to the communication module 34, and the communication module 34 further transmits fault study and judgment information to a terminal router or a background master station so as to realize remote monitoring.
The multipolar wire holder 20 is a tripolar wire holder or a quadrapolar wire holder, corresponds to a three-phase or three-phase four-wire circuit breaker, and can be integrally arranged or separately arranged, the multipolar wire holder 20 is provided with a wire inlet end 201 and a wire outlet end 202, one of the wire inlet end 201 and the wire outlet end 202 is directly or indirectly connected to a low-voltage distribution network and a user side load end, and the other is directly or indirectly connected to a photovoltaic inverter side.
In this embodiment, the circuit breaker 10 can be removed integrally from the multi-pole wire holder 20, the switching device further includes a surface cover disposed on the upper portion of the multi-pole wire holder 20, the multi-pole wire holder 20 and the surface cover together enclose a first chamber 50 for accommodating the circuit breaker 10, the end portions of the wire inlet end 201 and the wire outlet end 202 extend into the first chamber 50, when the circuit breaker 10 is removed from the multi-pole wire holder 20, the breakpoint of the conductive circuit connected to the circuit breaker 10 on the multi-pole wire holder 20 can be clearly seen, that is, the breakpoint of the end portions of the wire inlet end 201 and the wire outlet end 202 can be clearly seen, such a design can satisfy the requirement of electrical isolation, satisfy the requirement of electrical isolation output of the photovoltaic power generation system during maintenance and repair, and simultaneously facilitate connection, removal and replacement of the circuit breaker 10, safety of the switchgear 100 and a photovoltaic grid-connected power distribution system using the switchgear 100 is improved.
Referring to fig. 4, a micro switch 40 is disposed between the multi-pole wire holder 20 and the face cover, the micro switch 40 is connected to the electronic controller 30 of the switch, when the switch normally works, the face cover presses the micro switch 40, when the switch needs to be maintained, the face cover is detached, the micro switch is released, the micro switch sends a signal to the electronic controller 30, and the electronic controller 30 sends a tripping command to open the switch device, so that the power-off work during maintenance is realized.
The switch device 100 further comprises a temperature sensor 33, wherein the temperature sensor 33 is arranged near the incoming line end 201 and/or the outgoing line end 202, and is used for measuring the temperature of the incoming line end or the outgoing line end and sending the measured temperature information to the electronic controller 30, and in the embodiment, the temperature sensors are arranged near the incoming line end 201 and the outgoing line end 202.
Referring to fig. 7 and 8, the circuit breaker 10 includes an actuator 101, an operating mechanism 102, a fixed contact 104, a movable contact 103, an arc extinguish chamber and a motor 107, an incoming terminal 105 and an outgoing terminal 106, where the incoming terminal 105 is connected to the incoming terminal 201, the outgoing terminal 106 is connected to the outgoing terminal 202, the incoming terminal 105 and the incoming terminal 201 are arranged side by side up and down or left and right, and the outgoing terminal 106 and the outgoing terminal 202 are arranged side by side up and down or left and right, in this embodiment, the incoming terminal 105 and the incoming terminal 201 are arranged side by side up and down, the outgoing terminal 106 and the outgoing terminal 202 are arranged side by side up and down, a fastening device 204 for fastening the incoming terminal 201 and the outgoing terminal 202 is provided on the multi-pole wire holder 20, and a clamping device 108 for clamping the incoming terminal 105 and the incoming terminal 201 and clamping the outgoing terminal 106 and the outgoing terminal 202 is further provided on the circuit breaker 10, in this embodiment, the clamping device 108 is a cage terminal. The motor 107 controls the operating mechanism 102 of the circuit breaker 10, and when the electronic controller 30 sends a switching-on/off command to control the actuator 101 to act, the motor 107 rotates to drive the operating mechanism 102 of the circuit breaker 10, so as to realize the electrified switching-on/off function of the switch.
The communication module 34 may adopt wireless communication and/or wired communication, where the wireless communication includes at least one of communication manners such as 4G, 5G, WIFI, BLE, ZigBee, NB-IoT, and LoRa, and the wired communication includes at least one of communication manners such as HPLC, PLC, RS485, LAN, CAN, and Profibus.
In another embodiment, as shown in fig. 9, the switch may be of a knife switch type, the circuit breaker 10 is provided with a clip 110, the corresponding multipolar wire holder is provided with a blade 210 corresponding to the clip 110, and when the circuit breaker is inserted into or pulled out of the multipolar wire holder, the main circuit of the multipolar wire holder can be switched on or off.
The structures, ratios, sizes, quantities, and the like shown in the drawings of the embodiments of the present invention are used in combination with the disclosure of the specification, so that those skilled in the art can understand and read the disclosure without limiting the conditions of the present invention, and therefore, the present invention is not limited to the practical meanings, and any modifications of the structures, changes of the ratio relationships, or adjustments of the sizes should fall within the scope of the present invention without affecting the functions and the achievable purposes of the present invention. The present embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (19)
1. A switching device (100) comprising an insulating case, a circuit breaker (10) with electric operation, characterized in that: the insulation shell comprises an integrated or split multipole wire holder (20), at least one current collector (31), a voltage collector (32), an electronic controller and a communication module (34) are arranged on the multipole wire holder (20), the current collector (31) is arranged between the circuit breaker (10) and the multipole wire holder (20), the current collector (31) and a wiring terminal of the multipole wire holder (20) are correspondingly arranged, wiring terminals on two sides of the switch device (100) are respectively and directly or indirectly connected to a low-voltage distribution network side and a photovoltaic grid-connected inverter side, the electronic controller (30) receives and converts a sampling signal of the voltage collector (32) and obtains an analysis result through analysis and calculation of a microprocessor of the electronic controller (30) and compares the analysis result with a preset threshold value to judge whether to drive the circuit breaker to perform island protection, and when the analysis result is larger than or smaller than the preset threshold value, a driving signal is sent out to drive the breaker (10) to be switched off or tripped, so that the execution of the anti-islanding protection action is realized.
2. The switching device (100) of claim 1, wherein: the analysis result comprises at least one of voltage amplitude swing, voltage phase swing, voltage frequency swing and voltage waveform distortion rate swing.
3. The switching device (100) of claim 1, wherein: the circuit breaker (10) is a molded case circuit breaker or a miniature circuit breaker.
4. The switching device according to claim 1, wherein: the switching device (100) is further provided with a metering module.
5. The switching device according to claim 1, wherein: the switching device (100) further comprises a power supply module, and the electronic controller or/and the power supply module or/and the communication module are arranged on the left side or the right side of the circuit breaker (10).
6. The switching device according to claim 1, wherein: the circuit breaker (10) is connected to the multipole connection base (20) in a plug-in or wire connection manner.
7. The switching device according to claim 1, wherein: insulating housing is still including locating face lid on multipolar connection terminal (20) upper portion, multipolar connection terminal (20) with set up a micro-gap switch (40) between the face lid, micro-gap switch (40) with electronic controller (30) are connected, work as when the face lid is pulled down, release micro-gap switch, micro-gap switch sends signal and gives electronic controller (30), electronic controller (30) send the dropout order and make the circuit breaker separating brake.
8. The switching device according to claim 1, wherein: the circuit breaker (10) can be removed from the multipole connection base (20) in one piece, and the end of the inlet (201) or/and outlet (202) of the multipole connection base (20) protrudes into the interior of the multipole connection base (20).
9. The switching device according to claim 8, wherein: the circuit breaker (10) further comprises an actuator (101), an operating mechanism (102), a moving contact (103), a fixed contact (104) and a motor (107), wherein the motor (107) drives the actuator (101) to control the operation mechanism (102) to perform an inlet wire opening or closing action.
10. The switching device according to claim 9, wherein: the current collector (31) is arranged on a conductive path formed by electrically connecting the wire inlet end (201), the wire outlet end (202) and the circuit breaker (10).
11. The switching device according to claim 10, wherein: the communication module (34) is connected with the electronic controller (30), the current collector (31) collects current information on the conductive path, transmits the current information to the electronic controller (30) for current, power, coulometry and harmonic analysis, and transmits the current information to the platform area terminal, the collector or the main station through the communication module (34).
12. The switching device according to claim 11, wherein: the electronic controller (30) performs power quality protection judgment according to the acquired and calculated current and harmonic information, controls the actuator (101) to act, and drives the operating mechanism (102) to trip, so that the static contact (104) and the moving contact (103) are separated.
13. The switching device according to claim 8, wherein: breaker (10) include inlet wire terminal (105) and outlet terminal (106), inlet wire terminal (105) with inlet wire end (201) is from top to bottom or control and arranges side by side, outlet terminal (106) with outlet terminal (202) is from top to bottom or control and arranges side by side, still be provided with on the breaker and be used for pressing from both sides tightly inlet wire terminal (105) and inlet wire end (201), clamping device (108) of outlet terminal (106) and outlet terminal (202).
14. The switching device according to claim 1, wherein: the insulating housing further comprises a face cover, the multipolar wire holder (20) and the face cover enclosing a first chamber (50), the circuit breaker (10) being modularly mounted in the first chamber (50).
15. The switching device according to claim 1, wherein: the peripheral wall of the multi-pole wire holder (20) is internally provided with a space for accommodating the voltage collector (32), and the voltage collector (32) is arranged at a terminal close to the low-voltage distribution network side.
16. The switching device according to claim 9, wherein: the voltage collector (32) collects voltage information on a connecting line of the switching device and the low-voltage distribution network and transmits the voltage information to the electronic controller (30) for overvoltage protection and undervoltage protection analysis, and the electronic controller controls the actuator (101) to act according to the voltage information to drive the operating mechanism (102) to trip, so that the static contact (104) and the moving contact (103) are separated.
17. The switching device according to claim 1, wherein: the breaker (10) is provided with a clamping head or a slotting tool, the multipole wire holder (20) is provided with a corresponding slotting tool or clamping head, and the breaker (10) is inserted/pulled out when the multipole wire holder is used, the connection or disconnection of a main circuit of the multipole wire holder is realized.
18. A grid-connected photovoltaic power distribution system, which comprises a photovoltaic array (11), a photovoltaic inverter (12), the switching device (100) as claimed in any one of claims 1 to 17, an electric energy meter (13), a post-meter switch (14) and a 400V power distribution network, wherein direct current electric energy generated by the photovoltaic array (11) is transmitted to the photovoltaic inverter (12), the photovoltaic inverter (12) converts the direct current electric energy into alternating current electric energy and transmits the alternating current electric energy to the switching device (100), the electric energy on the 400V power distribution network is transmitted to a user for power supply after passing through the electric energy meter (13) and the post-meter switch (14) in sequence, and an outlet end (202) of the switching device (100) is connected to an inlet end (1401) side or an outlet end (1402) side of the post-meter switch (14); or the incoming line end (201) of the switch device (100) is connected to the incoming line end (1401) side or the outgoing line end (1402) side of the watch rear switch (14).
19. The grid-connected photovoltaic power distribution system according to claim 18, wherein the communication module (34) communicates with the electric energy meter (13), the electronic controller (30) compares the difference between the power and the electric quantity and determines the metering misalignment, and the determination result is transmitted to a station terminal, a collector or a main station through the communication module (34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202123075728.5U CN216389228U (en) | 2021-12-09 | 2021-12-09 | Switching device and photovoltaic grid-connected power distribution system |
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| CN202123075728.5U CN216389228U (en) | 2021-12-09 | 2021-12-09 | Switching device and photovoltaic grid-connected power distribution system |
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| CN216389228U true CN216389228U (en) | 2022-04-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116259508A (en) * | 2021-12-09 | 2023-06-13 | 北京京人电器有限公司 | Switching device and photovoltaic grid-connected power distribution system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116259508A (en) * | 2021-12-09 | 2023-06-13 | 北京京人电器有限公司 | Switching device and photovoltaic grid-connected power distribution system |
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Effective date of registration: 20240530 Address after: 301800 No. 17-1 Chaoyang East Road, Koudong Industrial Park, Baodi Economic Development Zone, Baodi District, Tianjin, China Patentee after: SOOAR (TIANJIN) ELECTRICAL EQUIPMENT Co.,Ltd. Country or region after: China Address before: 102600 2nd floor, building 2, 29 Jinyuan Road, economic development zone, Daxing District, Beijing Patentee before: BEIJING JINGREN ELECTRIC APPLIANCE Co.,Ltd. Country or region before: China |