CN214478574U - Anti-islanding device - Google Patents
Anti-islanding device Download PDFInfo
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- CN214478574U CN214478574U CN202023244364.4U CN202023244364U CN214478574U CN 214478574 U CN214478574 U CN 214478574U CN 202023244364 U CN202023244364 U CN 202023244364U CN 214478574 U CN214478574 U CN 214478574U
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Abstract
The utility model relates to the technical field of electrical cabinets, in particular to an anti-islanding device, which comprises a cabinet body, wherein the inner surface of the cabinet body is provided with a hollow control groove for accommodating a main operating switch QFD; one end of the main operation switch QFD is connected with an incoming cable through a fuse FU and a wiring terminal XK, and the other end of the main operation switch QFD is connected with a primary loop and a secondary protection loop; the utility model discloses a set up and control the groove and make maintenance personal need not to open the cabinet door operation, can be in the counter direct operation, promoted maintenance personal's safe in utilization greatly. And its simple structure, convenient operation has further improved work efficiency. On the other hand, a primary circuit and a secondary protection circuit are further arranged, the protection, measurement, signal and alarm functions are integrated, and the reliability and safety of the anti-islanding device are improved.
Description
Technical Field
The utility model relates to an electrical cabinet technical field, in particular to anti-island device.
Background
The photovoltaic 'island effect' refers to the phenomenon that when partial lines of a power grid have power failure due to faults or maintenance, a grid-connected power generation device connected with the power failure lines continues to supply power and forms a self-supplied power island together with surrounding loads. When the power grid normally works, the system is clamped by the power grid, and the photovoltaic power generation system is consistent with the power grid. And when the islanding phenomenon does not occur, the system is not controlled by the power grid any more, and once the islanding phenomenon occurs, the photovoltaic power generation system in an out-of-control state brings much harm. Therefore, anti-islanding protection is required to be additionally installed in the typical design of the national power grid, when the power grid needs to be overhauled, the grid-connected switch is disconnected, the anti-islanding device is manually put into use at the moment, and if the 400V bus has voltage, disturbance resistance in the anti-islanding device is put into use, so that the balance of power utilization is broken. The external voltage detected by the photovoltaic inverter is not enough to meet the normal output power generation, and the inverter is forced to stop. Therefore, the device is mainly used in the maintenance, and the personal safety of maintenance personnel and the safe power utilization of users are ensured.
The application number is CN202010258679.X entitled "distributed power generation system anti-islanding device", and the publication date is 2020, 08 and 25 days, and discloses a distributed power generation system anti-islanding device, which comprises: the reverse power relay with overcurrent is connected between the user side distributed grid-connected power generation system and the commercial power network, and is used for disconnecting the circuit when an island effect occurs; the current transformer is connected with the reverse power relay with the overcurrent and is used for inducing the reverse current when the island effect occurs; the power failure short message remote alarm is connected with a reverse power relay with overcurrent and sends alarm information to a set mobile phone in a short message mode when an island effect occurs; and the power supply supplies power to the reverse power relay with overcurrent.
The patent can judge the islanding phenomenon rapidly and reliably and can rapidly disconnect the circuit when in use, but does not have enough perfect protection measures and can bring danger to maintenance personnel. And the main operating switch, voltage indication, reset switch etc. of current anti-isolated island device all install in the cabinet, be not convenient for the device divide-shut brake or observe whether electrified for the operator need open the cabinet door and carry out a series of operations such as divide-shut brake, and expose electrified equipment in touching the cabinet easily in operation process, relate to personal safety.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that the anti-islanding device mentioned in the patent has potential safety hazard when in use, the utility model provides an anti-islanding device, which comprises a cabinet body, wherein the inner surface of the cabinet body is provided with a hollow control groove for accommodating a main operating switch QFD; one end of the main operation switch QFD is connected with an incoming cable through a fuse FU and a wiring terminal XK, and the other end of the main operation switch QFD is connected with a primary loop and a secondary protection loop;
the primary loop is formed by connecting the main operation switch QFD with a ground wire through a disturbance resistor RS;
the secondary protection loop comprises an incoming line switch QF, a time relay KT, an intermediate relay K, a reset switch FA and an alarm indicator lamp BR; the main operating switch QFD is connected with a zero line through a normally open contact and a coil of a time relay KT; the reset switch FA is connected with a normally open contact and a coil of an intermediate relay K and then connected in parallel with two ends of the main operation switch QFD and the time relay K, and the intermediate relay K is also connected with an alarm indicator lamp BR; the incoming line switch QF is connected in parallel with two ends of the main operating switch QFD and the time relay KT.
On the basis of the technical scheme, further, the main operating switch is electrically connected with the incoming cable through the fuse FU and the voltmeter.
On the basis of the technical scheme, an opening is formed in the back of the control groove, and when the cabinet door is closed, the main operation switch QFD can be embedded into the control groove.
On the basis of the technical scheme, further, a window door is arranged on the contact surface of the control groove and the cabinet body, and the window door is movably connected with the cabinet body so that the window door can be opened.
On the basis of the technical scheme, furthermore, a lock head is arranged on the window.
On the basis of the technical scheme, further, the reset switch FA is arranged on the outer surface of the cabinet body.
On the basis of the technical scheme, further, the voltmeter is arranged on the outer surface of the cabinet body.
On the basis of the technical scheme, furthermore, a plurality of partition plates are arranged inside the cabinet body.
On the basis of the technical scheme, further, a handle is arranged on the cabinet door of the cabinet body.
On the basis of the technical scheme, further, the cabinet body is further provided with a plurality of heat dissipation grids.
The utility model provides an anti-island device compares with prior art, has following advantage: set up the groove of controlling that can place main operating switch on the cabinet door for maintenance personal need not to open the cabinet door operation, can direct operation on the counter, has promoted maintenance personal's safety in utilization greatly. And its simple structure, convenient operation also provides convenience for maintenance personal, has further improved work efficiency. On the other hand, a primary circuit and a secondary protection circuit are further arranged, the protection, measurement, signal and alarm functions are integrated, and the reliability and safety of the anti-islanding device are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a circuit diagram of a primary circuit of an anti-islanding device provided by the present invention;
fig. 2 is a circuit diagram of a secondary protection circuit of the anti-islanding device provided by the present invention;
FIG. 3 is a circuit diagram of another embodiment of a secondary protection loop;
fig. 4 is a schematic perspective view of the switch cabinet door of the anti-islanding device according to the present invention in an open state;
fig. 5 is a schematic perspective view of an anti-islanding device switch cabinet provided by the present invention,
fig. 6 is a front view of the anti-islanding device switch cabinet provided by the present invention.
Reference numerals:
10 cabinet 20 control groove 30 main operation switch QFD
21-opening 22-window 23-lock
40 reset switch FA 50 voltmeter 60 isolation board
70 handle 80 heat dissipation grid
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The utility model provides an anti-islanding device, which comprises a cabinet body 10, wherein the inner surface of the cabinet body 10 is provided with a hollow control groove 20 for accommodating a main operating switch QFD 30; one end of the main operating switch QFD30 is connected with an incoming cable through a fuse FU1 and a wiring terminal XK, and the other end of the main operating switch QFD30 is connected with a primary loop and a secondary protection loop;
the primary loop is characterized in that the main operation switch QFD30 is connected with a ground wire through a disturbance resistor RS;
the secondary protection loop comprises an incoming line switch QF, a time relay KT, an intermediate relay K, a reset switch FA40 and an alarm indicator lamp BR; the main operating switch QFD30 is connected with a zero line through a normally open contact and a coil of a time relay KT; the reset switch FA40 is connected with a normally open contact and a coil of an intermediate relay K and then connected in parallel with two ends of the main operation switch QFD30 and a time relay K, and the intermediate relay K is also connected with an alarm indicator lamp BR; the incoming line switch QF is connected in parallel with two ends of the main operating switch QFD30 and the time relay KT.
In particular, as shown in fig. 1 to 6, the switchgear comprises a cabinet 10, the inner surface of said cabinet 10 is provided with a hollow handling groove 20 for housing a main operating switch QFD 30. When maintenance personnel need use anti-island device, need not open the cabinet door, through controlling groove 20 alright directly open or close main operating switch 30, realized anti-island device switch's external. One end of the main operating switch QFD30 is connected with an incoming cable through a fuse FU1 and a wiring terminal XK, and the other end of the main operating switch QFD30 is connected with a primary loop and a secondary protection loop; as shown in fig. 1, the primary loop connects the main operation switch QFD30 with the ground wire through a disturbance resistor RS, so as to force the inverter on the user side to stop operating, thereby providing convenience for system maintenance.
As shown in fig. 2, the secondary protection circuit includes an incoming line switch QF, a time relay KT, an intermediate relay K, a reset switch FA40, and an alarm indicator lamp BR; the main operating switch QFD30 is connected with a zero line through a normally open contact and a coil of a time relay KT, so that the function of time delay brake separation is realized;
the reset switch FA40 is connected with a normally open contact and a coil of an intermediate relay K and then connected in parallel with two ends of the main operation switch QFD30 and a time relay K, and the intermediate relay K is also connected with an alarm indicator lamp BR; through the circuit connection, the reset and alarm functions of the anti-islanding device are realized.
The incoming line switch QF is connected in parallel with two ends of the main operating switch QFD30 and the time relay KT. Through the connection, mutual interlocking between the main operation switch QFD30 and the incoming line switch QF can be realized, the error input of disturbance load caused by misoperation is avoided, and the safety performance of the system is improved.
In a power grid system with access to photovoltaic power generation, power failure operation is needed when on-line maintenance is carried out. The secondary protection circuit is developed and designed to prevent the photovoltaic power generation system from transmitting power reversely and protect the safety of operators. The working principle is as follows: when the line has a power failure and is overhauled, the anti-island device is put into use, and if residual voltage exists on the power grid line, the residual voltage is connected to the ground through the anti-island device. Meanwhile, the anti-islanding device can place a main molded case circuit breaker, namely a main operation switch QFD, in a brake separating position within set time, and a reset alarm lamp of the panel is turned on. And prompting that the anti-islanding device needs to be reset if the anti-islanding device needs to be thrown again.
The utility model provides an anti-island device has set up the groove of controlling that can place main operating switch on the cabinet door for maintenance personal need not to open the cabinet door operation, can be on the counter direct operation, has reduced the probability that maintenance personal contacted inside electrified components and parts, can reduce the potential safety hazard, has promoted maintenance personal's work efficiency. In addition, a secondary protection circuit is connected in the primary circuit, and functions of protection, measurement, signals, alarming and the like are integrated through the secondary protection circuit, so that the practicability and the safety of the anti-islanding device are improved.
Preferably, the main operation switch is also electrically connected with the incoming cable through the fuse FU2 and the voltmeter 50.
In specific implementation, as shown in fig. 3, the main operation switch is further electrically connected to the incoming cable through the fuse FU2 and the voltmeter 50. By connecting fuse FU2 and voltmeter, can measure the voltage parameter of circuit, be convenient for maintenance personal operation.
Preferably, the back of the manipulation groove 20 is provided with an opening 21, and the opening 21 allows the main operation switch 30 to be inserted into the manipulation groove 20 when the cabinet door is closed.
In a specific implementation, as shown in fig. 4, since the main operation switch 30 is fixed inside the cabinet 10, an opening 21 is provided at the back of the operation slot 20, and the main operation switch 30 can be inserted into the operation slot 20 when the cabinet door is closed through the opening 21. When the maintenance personnel need to operate the device, the switch can be opened by extending into the control groove 20. Through the invention concept, the installation position of the main operating switch 30 does not need to be changed, and the electric elements and the wiring circuit in the anti-island device are not randomly changed, so that the anti-island device is suitable for occasions requiring manual operation of various power distribution cabinets.
Preferably, a window 22 is disposed on a contact surface of the control slot 20 and the cabinet 10, and the window 22 is movably connected to the cabinet 10, so that the window 22 can be opened.
In specific implementation, as shown in fig. 6, a window 22 is disposed on a contact surface between the control slot 20 and the cabinet 10, and the window 22 is movably connected to the cabinet 10, so that the window 22 can be opened. The main operating switch 30 can be hidden inside the cabinet door by the design of the window door 22. When the main operation switch 30 needs to be opened, a maintenance worker can insert the window door 22 into the operation slot 20 to open the switch.
Preferably, the window and door 22 is provided with a locking head 23.
In specific implementation, as shown in fig. 6, in order to avoid unnecessary accidents caused by other people opening the door by mistake or in a mess, the utility model discloses be provided with tapered end 23 on the window 22 of controlling groove 20, need be opened by maintenance personal with specific key, increase its security performance.
Preferably, the reset switch FA40 is disposed on the outer surface of the cabinet 10.
During specific implementation, the outer surface of the cabinet body 10 is further provided with a reset switch FA40, and as an optimal scheme, the cabinet body is further provided with a work indicating lamp, so that maintenance personnel can observe the real-time running state of the equipment and timely process faults.
Preferably, the voltmeter 50 is disposed on an outer surface of the cabinet 10.
During specific implementation, the external surface of the cabinet body 10 is provided with the voltmeter 50, the voltmeter 50 with the main operation switch QFD30 and other electric connections inside the cabinet body 10 are convenient for maintenance personnel to observe the voltage, and the cabinet door does not need to be opened for checking. It should be understood that an ammeter may also be employed to observe the current state of the anti-islanding device.
Preferably, a plurality of partition boards 60 are provided inside the cabinet 10.
In specific implementation, a plurality of partition boards 60 are disposed inside the cabinet 10. The isolation board 60 can be used for fixing components such as fuses, disturbance loads, time relays and intermediate relays on the isolation board 60, the space in the cabinet is reasonably configured, the space utilization rate is increased, and the internal flat cables are clearer.
Preferably, a handle 70 is disposed on the door of the cabinet 10.
In specific implementation, a handle 70 is disposed on the cabinet door of the cabinet 10. The handle 70 may employ a pop-up lock. Preferably, a cabinet door lock is further provided near the handle 70 to prevent other people from contacting the electronic devices inside the anti-islanding device at will.
Preferably, the cabinet 10 is further provided with a plurality of heat dissipation grills 80.
In specific implementation, the cabinet body 10 is provided with a plurality of heat dissipation grids 80, and the heat dissipation performance of the switch cabinet is good through the arranged heat dissipation grids 80. In addition, the cabinet body 10 should be provided with a warning mark and other cautions to warn people of power and prevent accidental electric shock. In particular, it is also indicated that the cabinet is an anti-islanding device.
Although terms such as cabinet, console box, main operating switch QFD, opening, window, lock, voltmeter, reset switch, heat dissipation grid, handle, isolation board, etc. are used more often herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. An anti-islanding device, comprising: the intelligent cabinet comprises a cabinet body (10), wherein a hollow control groove (20) is formed in the inner surface of the cabinet body (10) and used for accommodating a main operation switch QFD (30); one end of the main operation switch QFD (30) is connected with an incoming cable through a fuse FU1 and a wiring terminal XK, and the other end of the main operation switch QFD is connected with a primary loop and a secondary protection loop;
the primary loop is characterized in that the main operation switch QFD (30) is connected with a ground wire through a disturbance resistor RS;
the secondary protection loop comprises an incoming line switch QF, a time relay KT, an intermediate relay K, a reset switch FA (40) and an alarm indicator lamp BR; the main operating switch QFD (30) is connected with a zero line through a normally open contact and a coil of a time relay KT; the reset switch FA (40) is connected with a normally open contact and a coil of an intermediate relay K and then connected in parallel with two ends of the main operation switch QFD (30) and the time relay K, and the intermediate relay K is also connected with an alarm indicator lamp BR; the incoming line switch QF is connected in parallel with two ends of the main operating switch QFD (30) and the time relay KT.
2. An anti-islanding device according to claim 1, wherein: the main operating switch is also electrically connected with an incoming cable through a fuse FU2 and a voltmeter (50).
3. An anti-islanding device according to claim 1, wherein: an opening (21) is formed in the back of the control groove (20), and when the cabinet door is closed, the opening (21) enables the main operation switch QFD (30) to be embedded into the control groove (20).
4. An anti-islanding device according to claim 3, wherein: a window (22) is arranged on the contact surface between the control groove (20) and the cabinet body (10), and the window (22) is movably connected with the cabinet body (10) so that the window (22) can be opened.
5. An anti-islanding device according to claim 4, wherein: the window and the door (22) are provided with a lock head (23).
6. An anti-islanding device according to claim 1, wherein: the reset switch FA (40) is arranged on the outer surface of the cabinet body (10).
7. An anti-islanding device according to claim 2, wherein: the voltmeter (50) is arranged on the outer surface of the cabinet body (10).
8. An anti-islanding device according to claim 1, wherein: a plurality of partition boards (60) are arranged inside the cabinet body (10).
9. An anti-islanding device according to claim 1, wherein: a handle (70) is arranged on the cabinet door of the cabinet body (10).
10. An anti-islanding device according to claim 1, wherein: the cabinet body (10) is also provided with a plurality of heat dissipation grids (80).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023244364.4U CN214478574U (en) | 2020-12-29 | 2020-12-29 | Anti-islanding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023244364.4U CN214478574U (en) | 2020-12-29 | 2020-12-29 | Anti-islanding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214478574U true CN214478574U (en) | 2021-10-22 |
Family
ID=78108521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023244364.4U Active CN214478574U (en) | 2020-12-29 | 2020-12-29 | Anti-islanding device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214478574U (en) |
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2020
- 2020-12-29 CN CN202023244364.4U patent/CN214478574U/en active Active
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