CN105203887A - Prewarning method, device and system for overload of transformer - Google Patents

Abstract

The invention provides a transformer overload early warning method, device and system, and relates to the technical field of grid operation and distribution integration. The method includes: monitoring the voltage signal and current signal of the distribution network transformer in the power grid in real time to determine the real-time power; monitoring whether the real-time power is greater than a preset safe power threshold; if so, generating early warning information and uploading the early warning information to the power consumption The information collection system server, so that the power consumption information collection system server transmits the early warning information to the marketing business application system server and the production PMS2.0 system server; if the overload time is greater than the preset time threshold, control the load in the distribution network transformer channel The protective circuit breaker disconnects the distribution network transformer path. The invention can solve the problem that the production PMS2.0 system in the current power grid system is not connected with the marketing system, and the load information of the distribution network transformer cannot be obtained. When the distribution network fails, the overload warning and protection of the distribution network transformer cannot be realized. question.

Description

Method, device and system for early warning of transformer overload

technical field

The invention relates to the technical field of power grid operation and distribution integration, in particular to a method, device and system for early warning of transformer overload.

Background technique

At present, in order to further integrate resources, smooth the professional coordination of power grid marketing and maintenance, and promote the joint efforts of power grid marketing, transportation inspection and other departments to improve customer service quality, the State Grid Corporation of China is carrying out the construction of business and distribution integration projects. The marketing and distribution integration system is based on the collection and management of marketing and distribution data. Through adaptive transformation of production, marketing, power grid GIS (Geographic Information System) and other systems, it can support fault repair/emergency repair, planned power outage management and other businesses, and assist distribution Integrated applications such as network planning, line loss lean management, and automatic report and installation for business expansion.

In the integration of production system, marketing system, power grid GIS and other systems, a unified power grid facility model, customer information model, basic data and topology relationship are constructed by establishing the association between marketing ledger information and power grid facility information such as substations, lines, and transformers , which can realize cross-departmental and cross-professional data sharing and business integration.

However, the equipment (asset) operation and maintenance lean management system (PMS2.0 system) in the power grid system has not been connected with the marketing system, and the load information of the distribution network transformer cannot be obtained. When the distribution network fails, the matching cannot be realized. Network transformer overload warning and distribution network transformer protection.

Contents of the invention

Embodiments of the present invention provide a transformer overload early warning method, device and system to solve the problem that the equipment (asset) operation and maintenance lean management system (PMS2.0 system) in the current power grid system has not been connected with the marketing system and cannot obtain To the load information of the distribution network transformer, when the distribution network fails, it is impossible to realize the overload warning of the distribution network transformer and the protection of the distribution network transformer.

To achieve the above object, the present invention adopts the following technical solutions:

A method for early warning of transformer overload, comprising:

Real-time monitoring of the voltage signal and current signal of the distribution transformer in the power grid;

determining the real-time power of the distribution network transformer according to the voltage signal and the current signal;

monitoring whether the real-time power is greater than a preset safe power threshold;

If the real-time power is greater than the safe power threshold, generate early warning information, and upload the early warning information to the server of the power consumption information collection system, so that the server of the power consumption information collection system transmits the early warning information to the marketing business Application system server and production PMS2.0 system server;

judging whether the overload time during which the real-time power is greater than the safe power threshold is greater than a preset time threshold;

If the overload time is greater than the time threshold, control the load protection circuit breaker in the path of the distribution network transformer to disconnect the path of the distribution network transformer.

Further, the method for early warning of transformer overload also includes:

The warning information is stored in a local database.

Further, the method for early warning of transformer overload also includes:

The historical maximum power and current actual power of the distribution network transformer are obtained from the warning information, and the historical maximum power and current actual power are displayed through a display circuit.

Specifically, the determining the real-time power of the distribution network transformer according to the voltage signal and the current signal includes:

Respectively reducing the voltage signal and the current signal, so that the voltage signal and the current signal are respectively a preset multiple of the reduced voltage signal and the reduced current signal;

The real-time power of the distribution network transformer is determined according to the reduced voltage signal and the reduced circuit signal.

A transformer overload warning device, comprising:

The first monitoring unit is used to monitor the voltage signal and current signal of the distribution transformer in the power grid in real time;

a real-time power determination unit, configured to determine the real-time power of the distribution network transformer according to the voltage signal and the current signal;

A second monitoring unit, configured to monitor whether the real-time power is greater than a preset safe power threshold;

An early warning unit, configured to generate early warning information when the real-time power is greater than the safe power threshold, and upload the early warning information to the server of the power consumption information collection system, so that the server of the power consumption information collection system The early warning information is transmitted to the marketing business application system server and the production PMS2.0 system server;

A judging unit, configured to judge whether the overload time during which the real-time power is greater than the safe power threshold is greater than a preset time threshold;

The overload protection unit is configured to control a load protection circuit breaker in the path of the distribution network transformer to disconnect the path of the distribution network transformer when the overload time is greater than the time threshold.

Further, the device for early warning of transformer overload also includes:

A storage unit, configured to store the warning information in a local database.

Further, the device for early warning of transformer overload also includes:

The display unit is used to obtain the historical maximum power and current actual power of the distribution network transformer from the warning information, and display the historical maximum power and current actual power through a display circuit.

Specifically, the real-time power determination unit includes:

A signal reduction module, configured to reduce the voltage signal and the current signal respectively, so that the voltage signal and the current signal are respectively a preset multiple of the reduced voltage signal and the reduced current signal;

The real-time power determination module is used to determine the real-time power of the distribution network transformer according to the reduced voltage signal and the reduced circuit signal.

A system for early warning of transformer overload, including a signal acquisition circuit, an operation processing chip circuit, a power supply circuit, a communication circuit, a load control circuit, a power consumption information collection system server, a marketing business application system server, and a production PMS2.0 system server;

One end of the signal acquisition circuit is connected to the distribution network transformer, and the other end of the signal acquisition circuit is connected to the operation processing chip circuit to transmit the voltage signal and current signal of the distribution network transformer collected by the signal acquisition circuit to the operation processing chip circuit;

The arithmetic processing chip circuit is connected to the communication circuit;

The communication circuit is also respectively connected to the load control circuit and the server of the power consumption information collection system;

The power consumption information collection system server is also connected to the load control circuit and the marketing business application system server;

The marketing business application system server is also connected with the production PMS2.0 system server;

The power supply circuit is respectively connected to the power supply input interface of the signal acquisition circuit, the operation processing chip circuit, the communication circuit and the load control circuit, so as to provide the power supply input interface for the signal acquisition circuit, operation processing chip circuit, communication circuit and the load control circuit powered by.

Further, the transformer overload warning system further includes a display circuit; the display circuit is respectively connected to the power supply circuit and the communication circuit.

The embodiment of the present invention provides a method, device and system for early warning of transformer overload. By determining the real-time power of the distribution network transformer, when the real-time power exceeds the safe power threshold, early warning information can be generated and uploaded to the power consumption information collection. system server, so that the power consumption information collection system server transmits the early warning information to the marketing business application system server and the production PMS2.0 system server, so that the production PMS2.0 system server can obtain the load of the distribution network transformer in time information, which is convenient for the server of the production PMS2.0 system to obtain the abnormal situation of the user's power in time. And when the overload time is greater than the preset time threshold, the load protection circuit breaker in the distribution network transformer passage is controlled to disconnect the distribution network transformer passage, so that when the distribution network fails, the present invention can protect the distribution network transformer Timely protection to avoid damage to the distribution network transformer due to overload. It can be seen that the present invention can solve the problem that the equipment (asset) operation and maintenance lean management system (PMS2.0 system) in the current power grid system has not been connected with the marketing system, and the load information of the distribution network transformer cannot be obtained. When the distribution network fails, It is impossible to realize the overload warning of the distribution network transformer and the protection of the distribution network transformer.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a flow chart 1 of a method for early warning of transformer overload provided by an embodiment of the present invention;

Fig. 2 is a flow chart 2 of a method for early warning of transformer overload provided by an embodiment of the present invention;

Fig. 3 is a structural schematic diagram 1 of a transformer overload early warning device provided by an embodiment of the present invention;

Fig. 4 is a structural schematic diagram II of a transformer overload early warning device provided by an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of a transformer overload warning system provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figure 1, an embodiment of the present invention provides a method for early warning of transformer overload, including:

Step 101, monitor the voltage signal and current signal of the distribution network transformer in the power grid in real time.

Step 102. Determine the real-time power of the distribution network transformer according to the voltage signal and the current signal.

Step 103, monitoring whether the real-time power is greater than a preset safe power threshold.

Step 104: If the real-time power is greater than the safe power threshold, generate early warning information and upload the early warning information to the server of the power consumption information collection system, so that the server of the power consumption information collection system transmits the early warning information to the marketing business application system server and the production PMS2. 0 system server.

After the production PMS2.0 system server obtains the early warning information, the production PMS2.0 system can issue an alarm, so that the production PMS2.0 system can perform emergency repair management and control of the distribution network, and perform fault judgment and location, and assist PMS2.0 to analyze distribution transformers , and analyze the abnormal situation of users, support the production PMS2.0 system for line loss analysis and calculation, etc.

Step 105, judging whether the overload time during which the real-time power is greater than the safe power threshold is greater than a preset time threshold.

Step 106. If the overload time is greater than the time threshold, control the load protection circuit breaker in the distribution network transformer path to disconnect the distribution network transformer path.

The embodiment of the present invention provides a transformer overload early warning method. By determining the real-time power of the distribution network transformer, when the real-time power exceeds the safe power threshold, early warning information can be generated and uploaded to the server of the power consumption information collection system. Make the power consumption information collection system server transmit the early warning information to the marketing business application system server and the production PMS2.0 system server, so that the production PMS2.0 system server can obtain the load information of the distribution network transformer in time, which is convenient for the production of the PMS2.0 system The server can obtain the abnormal situation of the user's electric power in time. And when the overload time is greater than the preset time threshold, the load protection circuit breaker in the path of the distribution network transformer is controlled to disconnect the path of the distribution network transformer, so that when the distribution network fails, the present invention can protect the distribution network transformer in time , to avoid damage to the distribution network transformer due to overload. It can be seen that the present invention can solve the problem that the equipment (asset) operation and maintenance lean management system (PMS2.0 system) in the current power grid system has not been connected with the marketing system, and the load information of the distribution network transformer cannot be obtained. When the distribution network fails, It is impossible to realize the overload warning of the distribution network transformer and the protection of the distribution network transformer.

In order for those skilled in the art to better understand the present invention, a more detailed embodiment is listed below to illustrate the present invention. As shown in FIG. 2, the embodiment of the present invention provides a transformer overload early warning method including:

Step 201, monitor the voltage signal and current signal of the distribution network transformer in the power grid in real time.

Step 202. Respectively reduce the voltage signal and the current signal, so that the voltage signal and the current signal are respectively a preset multiple of the reduced voltage signal and the reduced current signal.

The purpose of reducing the voltage signal and the current signal is to avoid damage to the entire load warning device by high voltage and high current.

Step 203: Determine the real-time power of the distribution network transformer according to the reduced voltage signal and the reduced circuit signal.

Step 204, monitoring whether the real-time power is greater than a preset safe power threshold.

If the real-time power is greater than the safe power threshold, go to step 205; if the real-time power is less than or equal to the safe power threshold, go back to step 201.

Step 205, generate early warning information, store the early warning information in the local database, and upload the early warning information to the server of the electricity consumption information collection system, so that the server of the electricity consumption information collection system transmits the early warning information to the marketing business application system server and the production PMS2 .0 system server.

Step 206: Obtain the historical maximum power and current actual power of the distribution network transformer from the warning information, and display the historical maximum power and current actual power through a display circuit.

Specifically, the display circuit can run historical operating load records, such as historical maximum power, average power, historical minimum power, etc., but is not limited thereto.

Step 207, judging whether the overload time during which the real-time power is greater than the safe power threshold is greater than a preset time threshold.

If the overload time is greater than the time threshold, execute step 208; otherwise, if the overload time is less than or equal to the time threshold, return to step 207 to re-time to determine whether the overload time is greater than a preset time threshold.

Step 208, controlling the load protection circuit breaker in the path of the distribution network transformer to disconnect the path of the distribution network transformer.

The embodiment of the present invention provides a transformer overload early warning method. By determining the real-time power of the distribution network transformer, when the real-time power exceeds the safe power threshold, early warning information can be generated and uploaded to the server of the power consumption information collection system. Make the power consumption information collection system server transmit the early warning information to the marketing business application system server and the production PMS2.0 system server, so that the production PMS2.0 system server can obtain the load information of the distribution network transformer in time, which is convenient for the production of the PMS2.0 system The server can obtain the abnormal situation of the user's electric power in time. And when the overload time is greater than the preset time threshold, the load protection circuit breaker in the path of the distribution network transformer is controlled to disconnect the path of the distribution network transformer, so that when the distribution network fails, the present invention can protect the distribution network transformer in time , to avoid damage to the distribution network transformer due to overload. It can be seen that the present invention can solve the problem that the equipment (asset) operation and maintenance lean management system (PMS2.0 system) in the current power grid system has not been connected with the marketing system, and the load information of the distribution network transformer cannot be obtained. When the distribution network fails, It is impossible to realize the overload warning of the distribution network transformer and the protection of the distribution network transformer.

Corresponding to the above method embodiments in Figures 1 and 2, as shown in Figure 3, the embodiment of the present invention also provides a transformer overload warning device, including:

The first monitoring unit 31 can monitor the voltage signal and current signal of the distribution transformer in the power grid in real time.

The real-time power determination unit 32 can determine the real-time power of the distribution network transformer according to the voltage signal and current signal monitored by the first monitoring unit 31 .

The second monitoring unit 33 can monitor whether the real-time power determined by the real-time power determining unit 32 is greater than a preset safe power threshold.

The early warning unit 34 can generate early warning information when the second monitoring unit 33 detects that the real-time power is greater than the safe power threshold, and upload the early warning information to the power consumption information collection system server, so that the power consumption information collection system server transmits the early warning information To the marketing business application system server and the production PMS2.0 system server.

The judging unit 35 may judge whether the overload time during which the real-time power monitored by the second monitoring unit 33 is greater than the safe power threshold is greater than a preset time threshold.

The overload protection unit 36 can control the load protection circuit breaker in the distribution network transformer path to disconnect the distribution network transformer path when the judging unit 35 judges that the overload time is greater than the time threshold.

Further, as shown in Figure 4, the transformer overload warning device also includes:

The storage unit 37 can store the warning information generated by the warning unit 34 in a local database.

Further, as shown in Figure 4, the transformer overload warning device also includes:

The display unit 38 can obtain the historical maximum power and current actual power of the distribution network transformer from the early warning information generated by the early warning unit 34, and display the historical maximum power and current actual power through a display circuit.

Specifically, as shown in FIG. 4, the real-time power determination unit 32 may include:

The signal reduction module 321 can reduce the voltage signal and the current signal respectively, so that the voltage signal and the current signal are respectively a preset multiple of the reduced voltage signal and the reduced current signal.

The real-time power determination module 322 can determine the real-time power of the distribution network transformer according to the reduced voltage signal and the reduced circuit signal.

The embodiment of the present invention provides a transformer overload early warning device. By determining the real-time power of the distribution network transformer, when the real-time power exceeds the safe power threshold, early warning information can be generated and uploaded to the server of the power consumption information collection system. Make the power consumption information collection system server transmit the early warning information to the marketing business application system server and the production PMS2.0 system server, so that the production PMS2.0 system server can obtain the load information of the distribution network transformer in time, which is convenient for the production of the PMS2.0 system The server can obtain the abnormal situation of the user's electric power in time. And when the overload time is greater than the preset time threshold, the load protection circuit breaker in the path of the distribution network transformer is controlled to disconnect the path of the distribution network transformer, so that when the distribution network fails, the present invention can protect the distribution network transformer in time , to avoid damage to the distribution network transformer due to overload. It can be seen that the present invention can solve the problem that the equipment (asset) operation and maintenance lean management system (PMS2.0 system) in the current power grid system has not been connected with the marketing system, and the load information of the distribution network transformer cannot be obtained. When the distribution network fails, It is impossible to realize the overload warning of the distribution network transformer and the protection of the distribution network transformer.

Corresponding to the above method embodiment, the embodiment of the present invention also provides a transformer overload early warning system, as shown in Figure 5, including a signal acquisition circuit 41, an arithmetic processing chip circuit 42, a power supply circuit 43, a communication circuit 44, a load The control circuit 45, the server 46 of the power consumption information collection system, the server 47 of the marketing business application system, and the server 48 of the production PMS2.0 system.

One end of the signal acquisition circuit 41 is connected to the distribution network transformer 40, and the other end of the signal acquisition circuit 41 is connected to the operation processing chip circuit 42, so as to transmit the voltage signal and the voltage signal of the distribution network transformer 40 collected by the signal acquisition circuit 41 to the operation processing chip circuit 42. current signal. The arithmetic processing chip circuit 42 is connected to the communication circuit 44 . The communication circuit 44 is also respectively connected to the load control circuit 45 and the server 46 of the power consumption information collection system. The power consumption information collection system server 46 is also connected to the load control circuit 45 and the marketing business application system server 47 . The marketing business application system server 47 is also connected with the production PMS2.0 system server 48 .

The power supply circuit 43 is respectively connected to the power supply input interface of the signal acquisition circuit 41, the arithmetic processing chip circuit 42, the communication circuit 44 and the load control circuit 45, so as to supply power for the signal acquisition circuit 41, the arithmetic processing chip circuit 42, the communication circuit 44 and the load control circuit 45 .

Further, as shown in FIG. 5 , the transformer overload warning system further includes a display circuit 49 . The display circuit 49 is connected to the power supply circuit 43 and the communication circuit 44, respectively.

It is worth noting that the signal acquisition circuit 41 includes a voltage transformer and a current transformer, through which the above-mentioned voltage signal and current signal can be collected respectively, and the voltage signal and the current signal can be reduced respectively.

The arithmetic processing chip circuit 42 can convert voltage signals and current signals into digital signals through an internal A/D converter, and then perform power calculation through an internal digital multiplier. Compared with the analog multiplier, the advantage of the digital multiplier is that the accuracy of the measurement can be guaranteed in the full range of power factor 0-1. Choose a high-precision A/D converter, the smaller the sampling time interval, the higher the accuracy of voltage and current measurement, and the more accurate the power calculation result. In addition, according to the working principle of the digital multiplier, it can also measure voltage, current, phase, frequency, forward and reverse active power and four-quadrant reactive power, etc.

In addition, the communication circuit 44 may be configured with a memory to complete local storage of transformer load data, overload warning information, trip information and the like. In addition, the communication circuit 44 can be configured with commonly used communication interfaces, including optical fiber interface, network interface, RS-485 interface, RS-232 interface, extended USB interface, etc., through which the transformer load data, overload warning information, and tripping information can be completed. and other content upload.

In addition, the load control circuit 45 may be composed of protective devices such as switches and circuit breakers.

The embodiment of the present invention provides a transformer overload early warning system. By determining the real-time power of the distribution network transformer, when the real-time power exceeds the safe power threshold, early warning information can be generated and uploaded to the server of the power consumption information collection system. Make the power consumption information collection system server transmit the early warning information to the marketing business application system server and the production PMS2.0 system server, so that the production PMS2.0 system server can obtain the load information of the distribution network transformer in time, which is convenient for the production of the PMS2.0 system The server can obtain the abnormal situation of the user's electric power in time. And when the overload time is greater than the preset time threshold, the load protection circuit breaker in the path of the distribution network transformer is controlled to disconnect the path of the distribution network transformer, so that when the distribution network fails, the present invention can protect the distribution network transformer in time , to avoid damage to the distribution network transformer due to overload. It can be seen that the present invention can solve the problem that the equipment (asset) operation and maintenance lean management system (PMS2.0 system) in the current power grid system has not been connected with the marketing system, and the load information of the distribution network transformer cannot be obtained. When the distribution network fails, It is impossible to realize the overload warning of the distribution network transformer and the protection of the distribution network transformer.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

In the present invention, specific examples have been applied to explain the principles and implementation methods of the present invention, and the descriptions of the above examples are only used to help understand the method of the present invention and its core idea; meanwhile, for those of ordinary skill in the art, according to this The idea of the invention will have changes in the specific implementation and scope of application. To sum up, the contents of this specification should not be construed as limiting the present invention.

Claims (10)

1. A method for transformer overload early warning, characterized in that, comprising: Real-time monitoring of the voltage signal and current signal of the distribution transformer in the power grid; determining the real-time power of the distribution network transformer according to the voltage signal and the current signal; monitoring whether the real-time power is greater than a preset safe power threshold; If the real-time power is greater than the safe power threshold, generate early warning information, and upload the early warning information to the server of the power consumption information collection system, so that the server of the power consumption information collection system transmits the early warning information to the marketing business Application system server and production PMS2.0 system server; judging whether the overload time during which the real-time power is greater than the safe power threshold is greater than a preset time threshold; If the overload time is greater than the time threshold, control the load protection circuit breaker in the path of the distribution network transformer to disconnect the path of the distribution network transformer. 2. the method for transformer overload early warning according to claim 1, is characterized in that, the method for described transformer overload early warning, also comprises: The warning information is stored in a local database. 3. the method for transformer overload early warning according to claim 2, is characterized in that, the method for described transformer overload early warning, also comprises: The historical maximum power and current actual power of the distribution network transformer are obtained from the warning information, and the historical maximum power and current actual power are displayed through a display circuit. 4. The method for early warning of transformer overload according to claim 1, wherein said determining the real-time power of said distribution network transformer according to said voltage signal and current signal comprises: Respectively reducing the voltage signal and the current signal, so that the voltage signal and the current signal are respectively a preset multiple of the reduced voltage signal and the reduced current signal; The real-time power of the distribution network transformer is determined according to the reduced voltage signal and the reduced circuit signal. 5. A transformer overload early warning device, characterized in that it comprises: The first monitoring unit is used to monitor the voltage signal and current signal of the distribution transformer in the power grid in real time; a real-time power determination unit, configured to determine the real-time power of the distribution network transformer according to the voltage signal and the current signal; A second monitoring unit, configured to monitor whether the real-time power is greater than a preset safe power threshold; An early warning unit, configured to generate early warning information when the real-time power is greater than the safe power threshold, and upload the early warning information to the server of the power consumption information collection system, so that the server of the power consumption information collection system The early warning information is transmitted to the marketing business application system server and the production PMS2.0 system server; A judging unit, configured to judge whether the overload time during which the real-time power is greater than the safe power threshold is greater than a preset time threshold; An overload protection unit, configured to control a load protection circuit breaker in the path of the distribution network transformer to disconnect the path of the distribution network transformer when the overload time is greater than the time threshold. 6. The device for early warning of transformer overload according to claim 5, characterized in that, the device for early warning of transformer overload further comprises: A storage unit, configured to store the warning information in a local database. 7. The device for early warning of transformer overload according to claim 6, characterized in that, the device for early warning of transformer overload further comprises: The display unit is used to obtain the historical maximum power and current actual power of the distribution network transformer from the warning information, and display the historical maximum power and current actual power through a display circuit. 8. The device for early warning of transformer overload according to claim 5, wherein the real-time power determination unit comprises: A signal reduction module, configured to reduce the voltage signal and the current signal respectively, so that the voltage signal and the current signal are respectively a preset multiple of the reduced voltage signal and the reduced current signal; The real-time power determination module is used to determine the real-time power of the distribution network transformer according to the reduced voltage signal and the reduced circuit signal. 9. A transformer overload early warning system, characterized in that it includes a signal acquisition circuit, an arithmetic processing chip circuit, a power supply circuit, a communication circuit, a load control circuit, and a power consumption information acquisition system server, a marketing business application system server and a production PMS2 .0 system server; One end of the signal acquisition circuit is connected to the distribution network transformer, and the other end of the signal acquisition circuit is connected to the operation processing chip circuit to transmit the voltage signal and current signal of the distribution network transformer collected by the signal acquisition circuit to the operation processing chip circuit; The arithmetic processing chip circuit is connected to the communication circuit; The communication circuit is also respectively connected to the load control circuit and the server of the power consumption information collection system; The power consumption information collection system server is also connected to the load control circuit and the marketing business application system server; The marketing business application system server is also connected with the production PMS2.0 system server; The power supply circuit is respectively connected to the power supply input interface of the signal acquisition circuit, the operation processing chip circuit, the communication circuit and the load control circuit, so as to provide the signal acquisition circuit, the operation processing chip circuit, the communication circuit and the load control circuit powered by. 10. The transformer overload warning system according to claim 9, characterized in that the transformer overload warning system further comprises a display circuit; the display circuit is respectively connected to the power supply circuit and the communication circuit.