CN212033834U - Anti-islanding automatic alarm device - Google Patents
Anti-islanding automatic alarm device Download PDFInfo
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- CN212033834U CN212033834U CN202020476175.0U CN202020476175U CN212033834U CN 212033834 U CN212033834 U CN 212033834U CN 202020476175 U CN202020476175 U CN 202020476175U CN 212033834 U CN212033834 U CN 212033834U
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Abstract
The utility model discloses an anti-island autoalarm, include: 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 utility model discloses can judge out island phenomenon rapidly reliably during the use and can be quick with the circuit disconnection, play the guard action.
Description
Technical Field
The utility model belongs to the technical field of electric power automation, especially, relate to an intelligent anti-island device.
Background
Islanding is a phenomenon specific to grid-connected power generation systems. The islanding phenomenon is that when the power supply of a power grid is tripped due to a fault accident or power failure maintenance, a distributed grid-connected power generation system (such as photovoltaic power generation, wind power generation, fuel cell power generation and the like) of each user end fails to detect a power failure state immediately and cuts off the distributed grid-connected power generation system from a mains grid, so that a self-powered islanding consisting of the distributed power station grid-connected power generation system and surrounding loads is formed. Once the island is generated, the safety of maintenance personnel on a power grid transmission line can be endangered; affecting the action program of a protection switch on the power distribution system and impacting a power grid protection device; the quality of transmitted electric energy is influenced, and the power supply voltage and frequency of the electric power island region are unstable; the phase asynchronization can be caused after the power supply of the power grid is recovered; the single-phase distributed power generation system can cause three-phase load of the system to be under-supplied with power. Therefore, anti-islanding detection must be possible for a grid-connected system. At present, a low-voltage anti-islanding device exists for islanding protection, and the device is special anti-islanding equipment specially designed for power overhaul or related power operators and comprises an operating switch and a disturbance load. When the distributed photovoltaic power generation system operates in an unplanned island mode, the unplanned island mode is damaged by changing the power balance of the distributed photovoltaic power generation island system, but because the intelligent and automatic levels are low, on one hand, the unplanned island in a line cannot be automatically detected and identified, whether the unplanned island occurs or not needs to be manually judged, and the unplanned island is not easy to damage the island in time; on the other hand, because device simple structure, when taking place the unplanned island, need the anti-island device of maintainer manual operation to need manual disconnect device after destroying the unplanned island, it is inconvenient to use, and can't guarantee the personal safety of fortune personnel of examining completely.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an anti-island automatic alarm device is provided, can judge out island phenomenon rapidly reliably and can be quick with the circuit disconnection.
In order to solve the technical problem, the utility model adopts the following technical scheme: anti-islanding automatic alarm device includes:
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.
Preferably, the reverse power relay with the overcurrent comprises a reverse power detection device and a cut-off signal output device, the reverse power detection device is used for detecting the reverse power of the user-side distributed grid-connected power generation system, and the cut-off signal output device outputs a circuit cut-off signal when an islanding effect occurs.
Preferably, the reverse power relay with overcurrent further includes an overcurrent detection device and an overcurrent delay circuit, an input end of the overcurrent delay circuit is connected to the overcurrent detection device, and an output end of the overcurrent delay circuit is connected to the off signal output device.
Preferably, the current transformer comprises an upper assembly and a lower assembly which are combined, the upper assembly comprises an upper base, an upper top cover and a U-shaped upper iron core, the upper base and the upper top cover are combined through a buckle structure, and the upper iron core is accommodated in an upper iron core channel formed by combining the upper base and the upper top cover; the lower assembly comprises a lower base and a first support, a second support and a U-shaped lower iron core, the first support and the second support are accommodated in the lower base, the lower iron core is located between the first support and the second support, the first support and the second support are combined through a buckle structure, the first support, the second support and the lower iron core are combined to form a lower iron core assembly, a coil is wound on the lower iron core assembly to form a magnetic core coil assembly, the lower base is connected with the magnetic core coil assembly through the buckle structure, and the upper iron core and the lower iron core are in contact to form a ring shape in a closed state of the open-close type current transformer.
Preferably, the power-off short message remote alarm comprises a power-off detection module, a modbus module, a GSM communication module and an alarm signal generation module, wherein a detection terminal of the power-off detection module is connected to a reverse power relay with overcurrent, an analog signal output end of the power-off detection module is connected to an analog signal input end of the modbus module, a digital signal output end of the modbus module is connected to a digital signal input end of the alarm signal generation module, and a digital signal output end of the alarm signal generation module is connected to a digital signal input end of the GSM communication module, and is used for transmitting an alarm signal generated by the alarm signal generation module according to the input digital signal to the GSM communication module and sending specified information to a mobile phone of a user.
The utility model discloses a technical scheme, following beneficial effect has:
when the islanding occurs, the current transformer can sense the reverse current, the anti-islanding automatic alarm device starts to alarm, and alarm information can be sent to a mobile phone of a manager in a form of short messages. It can be timely found out where the problem occurs so as to carry out emergency repair in time. The utility model discloses simple structure, cost are lower, the suitability is strong, can judge out island phenomenon rapidly reliably during the use and can be quick with the circuit disconnection, play the guard action.
The specific technical solution and the advantages of the present invention will be described in detail in the following detailed description with reference to the accompanying drawings.
Drawings
The invention will be further described with reference to the accompanying drawings and specific embodiments:
fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic diagram of the working principle of the power-off short message remote alarm.
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. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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.
It will be appreciated by those skilled in the art that features from the examples and embodiments described below may be combined with each other without conflict.
Referring to fig. 1, the anti-islanding automatic alarm device includes:
the reverse power relay 1 with overcurrent is connected between the user side distributed grid-connected power generation system and a commercial power network, and disconnects the circuit when an island effect occurs;
the current transformer 2 is connected with a reverse power relay with overcurrent and used for inducing reverse current when an island effect occurs;
the power failure short message remote alarm 3 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 reverse power relay with the overcurrent can refer to the prior art, has the model of NGJ-1, and aims to provide the reverse power relay with the overcurrent, which can simultaneously provide reverse power and overcurrent for a generator or an important load. The reverse power relay with the overcurrent further comprises an overcurrent detection device and an overcurrent delay circuit, wherein the input end of the overcurrent delay circuit is connected with the overcurrent detection device, and the output end of the overcurrent delay circuit is connected with the on-off signal output device. The overcurrent detection device is additionally arranged in the reverse power relay, so that the reverse power fault and the overcurrent fault are simultaneously protected, the equipment installation is facilitated, the occupied space of the equipment is reduced, and the equipment cost is reduced; the adjustable potentiometer and the indicator light are arranged on the relay panel, so that the relay can adapt to various generators with different capacities or various loads of different types, and maintenance personnel can conveniently find out faults when the faults occur.
The current transformer is in a model of DBKCT38 and comprises an upper assembly and a lower assembly which are combined, wherein the upper assembly comprises an upper base, an upper top cover and a U-shaped upper iron core, the upper base and the upper top cover are combined through a buckle structure, and the upper iron core is accommodated in an upper iron core channel formed by combining the upper base and the upper top cover; the lower assembly comprises a lower base and a first support, a second support and a U-shaped lower iron core, the first support and the second support are accommodated in the lower base, the lower iron core is located between the first support and the second support, the first support and the second support are combined through a buckle structure, the first support, the second support and the lower iron core are combined to form a lower iron core assembly, a coil is wound on the lower iron core assembly to form a magnetic core coil assembly, the lower base is connected with the magnetic core coil assembly through the buckle structure, and the upper iron core and the lower iron core are in contact to form a ring shape in a closed state of the open-close type current transformer.
Referring to fig. 2, the outage short message remote alarm comprises an outage detection module, a modbus module, a GSM communication module, and an alarm signal generation module, wherein a detection terminal of the outage detection module is connected to a reverse power relay, an analog signal output end of the outage detection module is connected to an analog signal input end of the modbus module, a digital signal output end of the modbus module is connected to a digital signal input end of the alarm signal generation module, and a digital signal output end of the alarm signal generation module is connected to a digital signal input end of the GSM communication module, and is configured to transmit an alarm signal generated by the alarm signal generation module according to an input digital signal to the GSM communication module, and send specified information to a mobile phone of a user. Therefore, when the circuit has the island effect, the short message can be sent to the manager, so that the problem can be found in time, and the loss is reduced.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that the present invention includes but is not limited to the contents described in the above specific embodiments. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (5)
1. Anti-islanding automatic alarm device, its characterized in that includes:
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.
2. The anti-islanding automatic alarm device according to claim 1, wherein: the reverse power relay with the overcurrent comprises a reverse power detection device and a cut-off signal output device, wherein the reverse power detection device is used for detecting the reverse power of a user side distributed grid-connected power generation system, and the cut-off signal output device outputs a circuit cut-off signal when an island effect occurs.
3. The anti-islanding automatic alarm device according to claim 2, wherein: the reverse power relay with the overcurrent further comprises an overcurrent detection device and an overcurrent delay circuit, wherein the input end of the overcurrent delay circuit is connected with the overcurrent detection device, and the output end of the overcurrent delay circuit is connected with the on-off signal output device.
4. The anti-islanding automatic alarm device according to claim 1, wherein: the current transformer comprises an upper assembly and a lower assembly which are combined, the upper assembly comprises an upper base, an upper top cover and a U-shaped upper iron core, the upper base and the upper top cover are combined through a buckle structure, and the upper iron core is accommodated in an upper iron core channel formed by combining the upper base and the upper top cover; the lower assembly comprises a lower base and a first support, a second support and a U-shaped lower iron core, the first support and the second support are accommodated in the lower base, the lower iron core is located between the first support and the second support, the first support and the second support are combined through a buckle structure, the first support, the second support and the lower iron core are combined to form a lower iron core assembly, a coil is wound on the lower iron core assembly to form a magnetic core coil assembly, the lower base is connected with the magnetic core coil assembly through the buckle structure, and the upper iron core and the lower iron core are in contact to form a ring shape in a closed state of the open-close type current transformer.
5. The anti-islanding automatic alarm device according to claim 1, wherein: the outage short message remote alarm comprises an outage detection module, a modbus module, a GSM communication module and an alarm signal generation module, wherein a detection terminal of the outage detection module is connected to a reverse power relay with overcurrent, an analog signal output end of the outage detection module is connected with an analog signal input end of the modbus module, a digital signal output end of the modbus module is connected with a digital signal input end of the alarm signal generation module, a digital signal output end of the alarm signal generation module is connected with a digital signal input end of the GSM communication module, and the outage short message remote alarm is used for transmitting an alarm signal generated by the alarm signal generation module according to an input digital signal to the GSM communication module and sending specified information to a mobile phone of a user.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020476175.0U CN212033834U (en) | 2020-04-03 | 2020-04-03 | Anti-islanding automatic alarm device |
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| CN202020476175.0U CN212033834U (en) | 2020-04-03 | 2020-04-03 | Anti-islanding automatic alarm device |
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| CN212033834U true CN212033834U (en) | 2020-11-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111585341A (en) * | 2020-04-03 | 2020-08-25 | 国网浙江台州市椒江区供电有限公司 | Anti-islanding device of distributed power generation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111585341A (en) * | 2020-04-03 | 2020-08-25 | 国网浙江台州市椒江区供电有限公司 | Anti-islanding device of distributed power generation system |
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