CN212033834U - Anti-islanding automatic alarm device - Google Patents

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

Anti-islanding automatic alarm device

technical field

The utility model belongs to the technical field of electric power automation, in particular to an intelligent anti-islanding device.

Background technique

The islanding effect is a unique phenomenon in grid-connected power generation systems. The so-called islanding phenomenon refers to that when the power supply of the power grid is tripped due to a fault accident or power outage maintenance, the distributed grid-connected power generation systems (such as photovoltaic power generation, wind power generation, fuel cell power generation, etc.) Cut itself off from the mains network, and form a self-sufficient power supply island consisting of a distributed power station grid-connected power generation system and surrounding loads. Once the island is generated, it will endanger the safety of maintenance personnel on the power grid transmission line; it will affect the action procedure of the protection switch on the power distribution system and impact the power grid protection device; it will affect the quality of transmitted power, and the power supply voltage and frequency in the power island area will be unstable; After the power supply of the grid is restored, the phases will be out of synchronization; the single-phase distributed generation system will cause the three-phase load of the system to lack phase power supply. Therefore, for a grid-connected system, it must be able to detect anti-islanding effect. At present, there is a low-voltage anti-islanding device for islanding protection, which is a special anti-islanding device specially designed for power maintenance or related power operators. It consists of operating switches and disturbance loads. When the distributed photovoltaic power generation system is operating in unplanned islands, the unplanned island operation is destroyed by changing the power balance of the distributed photovoltaic power generation island system. However, due to its low level of intelligence and automation, on the one hand, it is impossible to automatically detect and identify lines in the For unplanned islands, it is necessary to manually determine whether unplanned islands occur, which is not conducive to timely destruction of the islands; on the other hand, due to the simple structure of the device, when unplanned islands occur, maintenance personnel are required to manually operate the anti-islanding device, and the unplanned islands are destroyed. Afterwards, the device needs to be manually disconnected, which is inconvenient to use and cannot fully guarantee the personal safety of inspection personnel.

Utility model content

The technical problem to be solved by the utility model is to provide an anti-islanding automatic alarm device, which can quickly and reliably determine the islanding phenomenon and can quickly disconnect the circuit.

In order to solve the above-mentioned technical problems, the utility model adopts the following technical solutions: an anti-islanding automatic alarm device, including:

The reverse power relay with overcurrent is connected between the distributed grid-connected power generation system at the user end and the mains network, and the circuit is disconnected when the islanding effect occurs;

Current transformer, connected with reverse power relay with overcurrent, used to sense reverse current when islanding effect occurs;

The power-off SMS remote alarm is connected to the reverse power relay with overcurrent, and when the islanding effect occurs, the alarm information is sent to the setting mobile phone in the form of SMS;

Power supply to power the reverse power relay with overcurrent.

Preferably, the reverse power relay with overcurrent includes a reverse power detection device and a disconnection signal output device, the reverse power detection device is used to detect the reverse power of the distributed grid-connected power generation system at the user end, and the disconnection signal The output device outputs a circuit break signal when islanding occurs.

Preferably, the inverse power relay with overcurrent further includes an overcurrent detection device and an overcurrent delay circuit, the input end of the overcurrent delay circuit is connected to the overcurrent detection device, and the overcurrent delay circuit has an overcurrent detection device. The output end is connected with the breaking signal output device.

Preferably, the current transformer includes a combined upper assembly and a lower assembly, the upper assembly includes an upper base, an upper cover and a U-shaped upper iron core, the upper base and the upper cover are combined through a snap structure, and the upper The iron core is accommodated in the upper iron core channel formed by the combination of the upper base and the upper top cover; the lower assembly includes a lower base, a first bracket, a second bracket and a U-shaped lower iron core accommodated in the lower base, and the lower iron core The core is located between the first bracket and the second bracket, and the first bracket and the second bracket are combined through the buckle structure, and the first bracket, the second bracket and the lower iron core are combined to form a lower iron core assembly, and the lower The iron core assembly is wound with a coil to form a magnetic core coil assembly, and the lower base and the magnetic core coil assembly are connected by a buckle structure.

Preferably, the power failure short message remote alarm includes a power failure detection module, a modbus module, a GSM communication module, and an alarm signal generation module, and the detection terminal of the power failure detection module is connected to the reverse power relay with overcurrent, so The analog signal output end of the power failure detection module is connected with the analog signal input end of the modbus module, the digital signal output end of the modbus module is connected with the digital signal input end of the alarm signal generation module, and the alarm signal generation The digital signal output end of the module is connected with the digital signal input end of the GSM communication module, and is used to transmit the alarm signal generated by the alarm signal generation module according to the input digital signal to the GSM communication module, and send specified information to the user on the phone.

The technical scheme adopted by the utility model has the following beneficial effects:

When the islanding effect occurs, the current transformer can sense the reverse current, the anti-islanding automatic alarm device starts to alarm, and the alarm information can be sent to the manager's mobile phone in the form of SMS. You can find out where there is a problem in time so that you can repair it in time. The utility model has the advantages of simple structure, low cost and strong applicability, and can quickly and reliably determine the islanding phenomenon when in use, and can quickly disconnect the circuit to play a protective role.

The specific technical solutions of the present invention and its beneficial effects will be described in detail in the following specific embodiments in conjunction with the accompanying drawings.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment, the utility model is further described:

Fig. 1 is the structural representation of the utility model;

Figure 2 is a schematic diagram of the working principle of the power-off short message remote alarm.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. 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 in any way. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

It can be understood by those skilled in the art that the features in the following embodiments and implementations can be combined with each other without conflict.

Referring to Figure 1, the anti-islanding automatic alarm device includes:

The reverse power relay 1 with overcurrent is connected between the distributed grid-connected power generation system at the user end and the mains network, and the circuit is disconnected when the islanding effect occurs;

Current transformer 2, connected with the reverse power relay with overcurrent, is used to induce the reverse current when the islanding effect occurs;

Power-off SMS remote alarm 3, connected with the reverse power relay with overcurrent, when the islanding effect occurs, the alarm information is sent to the setting mobile phone in the form of SMS;

Power supply to power the reverse power relay with overcurrent.

Wherein, the reverse power relay with overcurrent can refer to the prior art, the model is NGJ-1, the purpose is to provide a reverse power relay with overcurrent that can provide reverse power and overcurrent to generators or important loads at the same time , including a reverse power detection device and a disconnection signal output device, the reverse power detection device is used to detect the reverse power of the distributed grid-connected power generation system at the user end, and the disconnection signal output device The output circuit is disconnected when the island effect occurs Signal. The inverse power relay with overcurrent also includes an overcurrent detection device and an overcurrent delay circuit, the input end of the overcurrent delay circuit is connected to the overcurrent detection device, and the output end of the overcurrent delay circuit is connected to the overcurrent detection device. The disconnection signal output device is connected. The overcurrent detection device is installed in the reverse power relay, which plays the role of protecting the reverse power fault and overcurrent fault at the same time, which facilitates the installation of the equipment, reduces the space occupied by the equipment, and reduces the cost of the equipment; The indicator light can make the relay adapt to various generators of different capacities or various kinds of loads, and it is also convenient for maintenance personnel to find the fault when the fault occurs.

The model of the current transformer is DBKCT38, including a combined upper assembly and a lower assembly, the upper assembly includes an upper base, an upper top cover and a U-shaped upper iron core, and the upper base and the upper top cover are combined by a snap structure. , the upper iron core is accommodated in the upper iron core channel formed by the combination of the upper base and the upper top cover; the lower assembly comprises a lower base and a first bracket, a second bracket and a U-shaped lower iron core accommodated in the lower base, The lower iron core is located between the first bracket and the second bracket, and the first bracket and the second bracket are combined through a buckle structure, and the first bracket, the second bracket and the lower iron core are combined to form a lower iron core assembly , the lower iron core assembly is wound with a coil to form a magnetic core coil assembly, the lower base and the magnetic core coil assembly are connected by a snap structure, in the closed state of the open-close current transformer, the upper iron core and the lower iron core contact to form a ring shape.

Referring to Fig. 2, the power outage short message remote alarm includes a power outage detection module, a modbus module, a GSM communication module, and an alarm signal generation module. The detection terminal of the power outage detection module is connected to the reverse power relay. The analog signal output end of the power failure detection module is connected with the analog signal input end of the modbus module, the digital signal output end of the modbus module is connected with the digital signal input end of the alarm signal generation module, and the alarm signal generation module The digital signal output end of the GSM communication module is connected with the digital signal input end of the GSM communication module, and is used to transmit the alarm signal generated by the alarm signal generation module according to the input digital signal to the GSM communication module, and send the specified information to the user's mobile phone. superior. Therefore, when there is an islanding effect on the line, a short message can be sent to the management personnel, which can find the problem in time and reduce the loss.

The above are only specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that the present utility model includes but is not limited to those described in the above specific embodiments. content. Any modifications that do not depart from the functional and structural principles of the present invention are intended to be included in 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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