CN218526088U - Smart power grids ground connection integrated protection device for electric power engineering - Google Patents
Smart power grids ground connection integrated protection device for electric power engineering Download PDFInfo
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- CN218526088U CN218526088U CN202222605070.2U CN202222605070U CN218526088U CN 218526088 U CN218526088 U CN 218526088U CN 202222605070 U CN202222605070 U CN 202222605070U CN 218526088 U CN218526088 U CN 218526088U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
Abstract
The utility model discloses a smart grid grounding comprehensive protection device for electric power engineering, which comprises a grounding cabinet, wherein a grounding grid is arranged at the lower end in the grounding cabinet; the grounding cabinet is internally provided with a three-phase high-voltage bus connected with an external smart grid at the upper end, and each phase line of the three-phase high-voltage bus is provided with a grounding protection system electrically connected with a grounding grid through a high-voltage current-limiting fuse; the grounding cabinet is characterized by further comprising an arc extinction grounding system which is connected with the grounding protection system in parallel and used for extinguishing electric arcs and inhibiting electric arc from reigniting after the grounding protection system breaks down, and a microcontroller which is electrically connected with the grounding protection system and the arc extinction grounding system through conducting wires is arranged at the upper end in the grounding cabinet. The utility model has the advantages of can realize multimode automatic switch-over ground protection so that can effectively extinguish the electric arc and restrain the electric arc and restrike, be difficult for arousing overvoltage and cause secondary equipment unusual because of overvoltage when taking place single-phase earth fault.
Description
Technical Field
The utility model relates to an electric power engineering technical field, more specifically say, in particular to smart power grids ground connection integrated protection device for electric power engineering.
Background
With the development of national economy, the demand of society on electric power is increasing, the scale of a power grid is gradually enlarged, and the structure is also more and more complex. Meanwhile, with the progress of science and technology, the requirements of power consumers on power are gradually increased, new requirements on the stability and the quality of the power are made, and the application and the development of the smart grid are further promoted.
At present, for the ground protection of the smart grid in China, a low-current grounding mode that a neutral point is not grounded is commonly adopted, namely, the power grid is grounded in a capacitance mode, when a single-phase grounding fault occurs in the use process of the grounding mode, intermittent arcs can be caused at the grounding position, namely, arcs which are periodically extinguished and reignited are extinguished, the intermittent arcs can cause overvoltage relative to the ground, the overvoltage can be transmitted to the whole smart grid which is directly connected with the grounding point, further, secondary equipment is abnormal, and the practical application requirements are difficult to meet.
Chinese patent publication No. CN206060185U discloses a smart grid grounding integrated protection device, which has the technical essential points that: the three-phase high-voltage vacuum circuit breaker comprises a microcomputer controller, three high-voltage fuses, three voltage transformers, a high-capacity three-phase combined overvoltage protector, a grounding reactor, three high-voltage single-phase vacuum contactors and three current transformers. After being connected with three voltage transformers, the three high-voltage fuses are connected in parallel with the large-capacity three-phase combined overvoltage protector, and after being connected with the current transformer, the high-voltage single-phase vacuum contactor and the grounding reactor, the three high-voltage fuses are connected in parallel. This scheme has solved and can extinguish electric arc and restrain the problem that electric arc restrike after taking place single-phase earth fault, but this scheme does not possess multimode earth protection's function, simultaneously, the utility model provides a new technical scheme solves above-mentioned technical problem.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a can realize multimode automatic switch-over ground protection so that can effectively extinguish electric arc and restrain electric arc reignition, be difficult for arousing overvoltage and cause secondary equipment unusual smart power grids ground connection integrated protection device for electric power engineering because of overvoltage when taking place single-phase earth fault.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the intelligent power grid grounding comprehensive protection device for the power engineering comprises a grounding cabinet, wherein a grounding grid is arranged at the lower end in the grounding cabinet; the grounding cabinet is characterized in that a three-phase high-voltage bus connected with an external smart grid is arranged at the upper end in the grounding cabinet, and a grounding protection system electrically connected with the grounding grid is arranged on each phase line of the three-phase high-voltage bus through a high-voltage current-limiting fuse; the grounding cabinet is characterized by further comprising an arc extinction grounding system which is connected with the grounding protection system in parallel and used for extinguishing electric arcs and inhibiting electric arc from reigniting after the grounding protection system breaks down, and a microcontroller which is electrically connected with the grounding protection system and the arc extinction grounding system through conducting wires is arranged at the upper end inside the grounding cabinet.
Preferably, the ground protection system includes an ac contactor, a grounding transformer, a reactor and a voltage transformer, an input end of the voltage transformer is connected with an output end of the high-voltage current-limiting fuse through a wire, a normally closed contact NC of the ac contactor is connected with an output end of the voltage transformer and an input end of the grounding transformer through wires, respectively, an output end of the grounding transformer is connected with the grounding network through a wire via the reactor, wherein a coil end of the ac contactor and the voltage transformer are both electrically connected with the microcontroller.
Preferably, the arc extinction grounding system comprises an arc extinction coil which is respectively and electrically connected with the input end of the high-voltage current-limiting fuse and the output end of the reactor through wires, and further comprises a resistor of which one input end is electrically connected with the input end of the high-voltage current-limiting fuse through a normally open contact NO of the alternating current contactor through a wire, and the output end of the resistor is electrically connected with the output end of the reactor through a wire, wherein the arc extinction grounding system is electrically connected with the microcontroller through the arc extinction coil.
Preferably, the microcontroller is further connected with a zero sequence current transformer through a wire, and the zero sequence current transformer is electrically connected with the grounding grid through a wire.
Preferably, the ac contactor is a CKJ5 vacuum ac contactor.
Preferably, the resistor is a stainless steel nichrome resistor.
Preferably, the microcontroller is a MSP430248 microcontroller.
Compared with the prior art, the utility model discloses the beneficial effect who has as follows:
1. when the utility model is used, when single-phase earth fault occurs, namely the earth protection system fails, the voltage transformer of the earth protection system sends the single-phase earth fault information to the microcontroller, at the moment, the current grounding fault is a transient grounding fault, the microcontroller starts an arc suppression coil of an arc suppression grounding system to work, so that a three-phase high-voltage bus, the arc suppression coil and a grounding grid are sequentially communicated to ground a fault phase to transfer fault current, further, the electric arc is extinguished, the electric arc reignition is inhibited until the fault is eliminated, if the transient earth fault can not be eliminated within the preset time, then the fault is converted into a permanent grounding fault, at the moment, the microcontroller stops the work of the arc suppression coil, simultaneously energizes the coil of the alternating current contactor of the grounding protection system to close the normally open contact NO of the alternating current contactor, enables the three-phase high-voltage bus, the alternating current contactor, the resistor of the arc suppression grounding system and the grounding grid to be sequentially communicated to ground the fault phase so as to cut off a fault circuit and transfer fault current, thereby further playing the roles of extinguishing the electric arc and inhibiting the electric arc from reigniting until the fault is eliminated, the utility model adopts the structure, by the mutual cooperation of the microcontroller and the arc extinction grounding system with the multimode grounding circuit, the grounding circuit can be automatically switched among the multimode grounding circuits according to the type of the grounding fault so as to flexibly process the grounding fault, effectively prevent overvoltage from being caused, avoid secondary equipment abnormity caused by the overvoltage, and achieve the purpose of comprehensive grounding protection of the intelligent power grid, therefore, the utility model has the advantages of can realize multimode automatic switch-over ground protection so that can effectively extinguish the electric arc and restrain the electric arc and restrike, be difficult for arousing the overvoltage and cause secondary equipment unusual because of the overvoltage when taking place single-phase earth fault.
2. The utility model discloses still be equipped with one and be connected zero sequence current transformer through wire and microcontroller and ground net electricity, during the use, through zero sequence current transformer real-time supervision microcontroller's line current to ensure microcontroller and the utility model discloses a safe in utilization.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of a smart grid grounding integrated protection device for power engineering according to the present invention;
fig. 2 is a circuit control schematic diagram of the smart power grid grounding integrated protection device for power engineering.
Description of reference numerals: 1. the system comprises a grounding cabinet, 2, a grounding grid, 3, a three-phase high-voltage bus, 4, a high-voltage current-limiting fuse, 5, a grounding protection system, 51, an alternating-current contactor, 52, a grounding transformer, 53, a reactor, 54, a voltage transformer, 6, an arc-extinguishing grounding system, 61, an arc-extinguishing coil, 62, a resistor, 7, a microcontroller, 8 and a zero-sequence current transformer.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Referring to fig. 1 to 2, the smart grid grounding comprehensive protection device for power engineering includes a grounding cabinet 1, wherein a grounding grid 2 is arranged at the lower end of the inside of the grounding cabinet 1; the method is characterized in that: a three-phase high-voltage bus 3 connected with an external smart grid is arranged at the upper end in the grounding cabinet 1, and a grounding protection system 5 electrically connected with the grounding grid 2 is arranged on each phase line of the three-phase high-voltage bus 3 through a high-voltage current-limiting fuse 4; the grounding cabinet also comprises an arc extinction grounding system 6 which is connected with the grounding protection system 5 in parallel and is used for extinguishing electric arc and inhibiting electric arc from reigniting after the grounding protection system 5 breaks down, and a microcontroller 7 which is electrically connected with the grounding protection system 5 and the arc extinction grounding system 6 through conducting wires is arranged at the upper end in the grounding cabinet 1.
The grounding protection system 5 comprises an alternating current contactor 51, a grounding transformer 52, a reactor 53 and a voltage transformer 54, wherein the input end of the voltage transformer 54 is connected with the output end of the high-voltage current-limiting fuse 4 through a wire, a normally closed contact NC of the alternating current contactor 51 is respectively connected with the output end of the voltage transformer 54 and the input end of the grounding transformer 52 through wires, the output end of the grounding transformer 52 is connected with the grounding grid 2 through the reactor 53 through a wire, and the coil end of the alternating current contactor 51 and the voltage transformer 54 are electrically connected with the microcontroller 7.
The arc extinction grounding system 6 comprises an arc extinction coil 61 respectively connected with the input end of the high-voltage current-limiting fuse 4 and the output end of the reactor 53 through wires, and further comprises a resistor 62 with an input end connected with the input end of the high-voltage current-limiting fuse 4 through a normally open contact NO of the alternating current contactor 51 through a wire, wherein the output end of the resistor 62 is electrically connected with the output end of the reactor 53 through a wire, and the arc extinction grounding system 6 is connected with the microcontroller 7 through the arc extinction coil 61.
The microcontroller 7 is also connected with a zero sequence current transformer 8 through a conducting wire, and the zero sequence current transformer 8 is electrically connected with the grounding grid 2 through a conducting wire.
Wherein the AC contactor 51 is a CKJ5 vacuum AC contactor; the resistor 62 is a stainless steel nichrome resistor; the microcontroller 7 is a MSP430248 microcontroller.
When the three-phase high-voltage bus is used specifically, firstly, the grounding cabinet 1 is installed in a designated place, the grounding grid 2 is grounded, and then the three-phase high-voltage bus 3 is electrically connected with an external smart grid; secondly, when the external smart grid is subjected to ground protection, closing each high-voltage current-limiting fuse 4, and enabling each phase line of the three-phase high-voltage bus 3, the corresponding high-voltage current-limiting fuse 4, a voltage transformer 54 of the ground protection system 5, a normally closed contact NC of the alternating current contactor 51, a grounding transformer 52, a reactor 53 and the ground grid 2 to be sequentially communicated to form a ground protection circuit system; then, when a single-phase ground fault occurs, namely, when the ground protection system 5 of one phase line of the three-phase high-voltage bus 3 fails, the voltage transformer 54 of the failed ground protection system 5 sends the single-phase ground fault information of the fault end to the microcontroller 7, at this time, the current ground fault is an instantaneous ground fault, the microcontroller 7 starts the arc suppression coil 61 of the corresponding arc suppression ground system 6 to work, so that the three-phase high-voltage bus 3, the arc suppression coil 61 and the ground grid 2 are sequentially communicated to ground the fault phase to transfer fault current, further extinguish the arc and suppress arc reignition until the fault is eliminated; finally, if the transient earth fault can not be eliminated within the preset time, the transient earth fault is converted into a permanent earth fault, at the moment, the microcontroller 7 stops the operation of the arc suppression coil 61, simultaneously energizes the coil of the alternating current contactor 51 of the earth protection system 5 to close the normally open contact NO of the alternating current contactor 51, and sequentially communicates the three-phase high-voltage bus 3, the normally open contact NO conducted by the alternating current contactor 51, the resistor 62 and the earth grid 2 to ground the fault phase to isolate the fault line and transfer the fault current, so that the effects of extinguishing the arc and inhibiting the reignition of the arc are achieved until the fault is eliminated, and in addition, the microcontroller 7 monitors the line current of the microcontroller 7 in real time through the zero sequence current transformer 8 in the operation process to ensure the use safety of the microcontroller 8 and the intelligent power grid earth comprehensive protection device for the power engineering.
In a word, the utility model adopts the above structure, have and to realize multimode automatic switch-over ground protection so that can effectively extinguish electric arc and restrain electric arc restrike, be difficult for arousing overvoltage and cause the unusual advantage of secondary equipment because of overvoltage when taking place single-phase earth fault.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes are intended to fall within the scope of the claims.
Claims (7)
1. A grounding comprehensive protection device of a smart power grid for electric power engineering comprises a grounding cabinet (1), wherein a grounding grid (2) is arranged at the lower end in the grounding cabinet (1); the method is characterized in that: a three-phase high-voltage bus (3) connected with an external smart grid is arranged at the upper end in the grounding cabinet (1), and a grounding protection system (5) electrically connected with the grounding grid (2) is arranged on each phase line of the three-phase high-voltage bus (3) through a high-voltage current-limiting fuse (4); the grounding cabinet is characterized by further comprising an arc extinction grounding system (6) which is connected with the grounding protection system (5) in parallel and used for extinguishing electric arcs and inhibiting electric arc reignition after the grounding protection system (5) breaks down, wherein a microcontroller (7) which is electrically connected with the grounding protection system (5) and the arc extinction grounding system (6) through conducting wires is arranged at the upper end inside the grounding cabinet (1).
2. The smart grid grounding comprehensive protection device for electric power engineering according to claim 1, characterized in that: the grounding protection system (5) comprises an alternating current contactor (51), a grounding transformer (52), a reactor (53) and a voltage transformer (54), wherein the input end of the voltage transformer (54) is connected with the output end of the high-voltage current-limiting fuse (4) through a wire, a normally closed contact NC of the alternating current contactor (51) is respectively connected with the output end of the voltage transformer (54) and the input end of the grounding transformer (52) through wires, the output end of the grounding transformer (52) is connected with the grounding network (2) through a wire, wherein the coil end of the alternating current contactor (51) and the voltage transformer (54) are electrically connected with the microcontroller (7).
3. The smart grid grounding comprehensive protection device for electric power engineering according to claim 2, characterized in that: arc extinction grounding system (6) include through the wire respectively with the input of high pressure current-limiting fuse (4), arc extinction coil (61) that the output of reactor (53) is connected, still include an input through the wire warp the normally open contact NO of ac contactor (51) with resistor (62) that the input of high pressure current-limiting fuse (4) is connected electrically, the output of resistor (62) through the wire with the output electricity of reactor (53) is connected, wherein, arc extinction grounding system (6) are through arc extinction coil (61) with microcontroller (7) electricity is connected.
4. The intelligent power grid grounding comprehensive protection device for power engineering according to claim 3, characterized in that: the microcontroller (7) is further connected with a zero sequence current transformer (8) through a conducting wire, and the zero sequence current transformer (8) is electrically connected with the grounding grid (2) through the conducting wire.
5. The intelligent power grid grounding comprehensive protection device for power engineering according to claim 4, characterized in that: the alternating current contactor (51) is a CKJ5 vacuum alternating current contactor.
6. The intelligent power grid grounding comprehensive protection device for power engineering according to claim 4, characterized in that: the resistor (62) is a stainless steel nichrome resistor.
7. The smart grid grounding comprehensive protection device for power engineering according to any one of claims 1 to 6, characterized in that: the microcontroller (7) is an MSP430248 microcontroller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222605070.2U CN218526088U (en) | 2022-09-30 | 2022-09-30 | Smart power grids ground connection integrated protection device for electric power engineering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222605070.2U CN218526088U (en) | 2022-09-30 | 2022-09-30 | Smart power grids ground connection integrated protection device for electric power engineering |
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| Publication Number | Publication Date |
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| CN218526088U true CN218526088U (en) | 2023-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222605070.2U Active CN218526088U (en) | 2022-09-30 | 2022-09-30 | Smart power grids ground connection integrated protection device for electric power engineering |
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| CN (1) | CN218526088U (en) |
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- 2022-09-30 CN CN202222605070.2U patent/CN218526088U/en active Active
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