A device and method for managing abnormal user load at a dedicated transformer metering point

Abstract

The present invention provides a device and method for managing abnormal user load at a special transformer metering point, including a special transformer fault alarm, which is installed in the secondary metering circuit of a high-voltage metering box, adopts a hanging meter installation method, and is connected to a smart meter in a voltage parallel and current series relationship. The high-voltage metering box collects the line voltage and current values ​​represented in real time, and provides abnormal SMS alarms for low voltage, abnormal load current, and over-capacity default electricity consumption, reminding power supply management personnel to pay attention to the abnormal electricity consumption of the user, and combined with the power outage event of the distribution line, so as to help power supply management personnel quickly locate the source of line faults, prevent users from causing faults due to long-term over-capacity electricity consumption, improve the reliability of power supply lines, and shorten the inspection time. Low cost, fast installation, no need for a power outage, suitable for rapid transformation of old distribution lines to improve fault management level in a short period of time.

Description

Technical Field

[0001] The present invention relates to the field of power distribution in the electric power industry, and in particular to a device for managing abnormal user loads at a dedicated transformer metering point. Background Art

[0002] At present, power supply departments, especially those in underdeveloped provinces, have only installed high-voltage metering boxes and smart electricity meters at the property boundary points of dedicated transformer users. According to statistics from a power supply department, about 47% of line tripping and power outages are caused by load failures on the dedicated transformer user side. Each line outage requires line operation and maintenance personnel to patrol and inspect to determine the source of the fault, which usually takes more than 2 hours and affects the electricity consumption of other normal users.

[0003] Smart energy meters collect voltage and current data in an integral manner and are unable to correctly collect the instantaneous value of the fault current.

[0004] If the distribution feeder terminal is modified, firstly, it is necessary to disconnect the primary line and install a vacuum circuit breaker. The number of users of the entire line is large and the equipment cost is huge. Secondly, power outage operations are usually required (the cost of live operations is high), which affects the normal power consumption of users, is not conducive to social and economic production activities, and makes construction organization difficult. Thirdly, there are many user points, the transformation cycle is long, and the effect is slow.

[0005] If a line fault indicator is used for modification, firstly, line patrol is still required, and it can only indicate quick-break short-circuit and extremely large current faults, but not overcurrent faults, and its function is not flexible enough; secondly, it is still necessary to install a transformer on the primary line.

[0006] If intelligent line fault indicators are used for transformation, first, a mutual inductor needs to be installed on the primary line; second, a communication host needs to be installed on the primary line pole, and the power supply of the communication host is usually solar energy, which has requirements for the climate and installation environment, and maintenance work is required in the later stage; third, a main station server needs to be set up, which has requirements for management work.

[0007] Therefore, the power supply department hopes for a fault management product that does not need to involve primary lines during construction, is easy to install, has low cost, and is suitable for the rapid transformation of entire old lines, so as to improve the level of distribution line fault management. Summary of the invention

[0008] The present invention aims to provide a device for managing abnormal user load at a dedicated transformer metering point. The device is installed at the dedicated transformer metering point of the line, collects line voltage and current values ​​in real time through a high-voltage metering box, compares the set management event conditions, determines abnormal events, and sends SMS alarms. It helps power supply management personnel quickly locate line fault sources, prevent users from causing faults due to long-term over-capacity electricity consumption, improve power supply line reliability and shorten inspection time under the premise of low cost, simple and fast installation, and no renovation and construction involving primary lines. It is suitable for rapid renovation of old distribution lines to improve fault management level in a short period of time.

[0009] To achieve the above-mentioned purpose, the present invention proposes the following technical scheme: a device for managing abnormal user load at a special transformer metering point, wherein the special transformer fault alarm is installed in the secondary metering circuit of a high-voltage metering box, adopts a hanging meter installation method, and is connected with a smart meter in parallel for voltage and series for current, including a special transformer fault alarm, wherein the special transformer fault alarm includes a core processing module, an event collection module, a display module, an indication module, a text message module and a maintenance module, wherein the core processing module is connected to the display module and the indication module respectively, and the core processing module is connected to the text message module, the event collection module and the maintenance module through three serial ports.

[0010] Further, in the present invention, the core processing module is a processor AT91SAM9260, which is used for data processing;

[0011] The display module is an LCD dot matrix display screen, which is used to display information of the special transformer fault alarm instrument. The LCD dot matrix display screen is connected to the processor AT91SAM9260 using an LCD bus interface;

[0012] The indication module is an LED indicator light, which is used to indicate the working status of the transformer fault alarm. The LED indicator light is connected to the processor AT91SAM9260 using an analog output interface.

[0013] The SMS module includes a GSM module chip M72D, which is connected to the processor AT91SAM9260 using an RS232 serial port to provide SMS input and output operations;

[0014] The maintenance module is a local maintenance port, which is connected to the processor AT91SAM9260 using an RJ45 network port to provide debugging and monitoring functions;

[0015] The event acquisition module includes an N32G452VEL7 chip with a 12-bit AD converter, 3 groups of voltage transformers, 3 groups of current transformers, and a signal sampling circuit, and is connected to the processor AT91SAM9260 using an RS485 interface; the event acquisition module relies on the 12-bit AD of the MCU, collects 64 points per cycle of the industrial frequency, and uses the FFT algorithm to obtain the real-time values ​​of the three-phase voltage, current, and zero-sequence current, and determines whether various abnormal events occur, and provides real-time sampling values ​​of voltage and current and abnormal event data.

[0016] Furthermore, the present invention also includes a key, which is connected to the processor AT91SAM9260 using an I / O interface to provide a key input function for human-computer interaction.

[0017] Furthermore, the present invention also includes a power supply module, which uses AC85-264V power input and outputs three power supplies of DC12V, DC5V, and DC3.3V to provide working power for various components in the special transformer fault alarm instrument.

[0018] Furthermore, in the present invention, the various abnormal events include quick-break fault events, overcurrent fault events, overload events, ground quick-break fault events, ground overcurrent fault events, ground over-limit fault events and low voltage events.

[0019] A method for managing user load anomalies at a dedicated transformer metering point, the method uses the above-mentioned device for managing user load anomalies at a dedicated transformer metering point, the dedicated transformer fault alarm instrument collects various voltage and current values ​​of the high-voltage metering box in real time, and determines whether low voltage, various load current anomalies, and over-capacity power consumption occur;

[0020] The judgment of whether low voltage, various types of load current abnormalities, and over-capacity default power consumption occur refers to judging in sequence whether it is a set quick-break fault event, overcurrent fault event, overload event, ground quick-break fault event, ground overcurrent fault event, ground over-limit fault event, and low voltage event. If the event conditions are met, the dedicated transformer fault alarm generates a corresponding event and sends a corresponding alarm SMS to the set power supply management personnel;

[0021] The quick-break fault event refers to the detected current of a phase of the high-voltage metering box being greater than the current set value set for the quick-break fault event and exceeding the set delay time;

[0022] The overcurrent fault event refers to the detected current of a phase of the high-voltage metering box being greater than the current set value set for the overcurrent fault event and exceeding the set delay time;

[0023] The overload event refers to the current of a phase of the high-voltage metering box detected is greater than the current set value set for the overload event and exceeds the set delay time;

[0024] The grounding quick-break fault event refers to the zero-sequence current calculated by the three-phase current of the three-element high-voltage metering box detected, and the zero-sequence current value is greater than the current set value set for the grounding quick-break fault event and exceeds the set delay time;

[0025] The ground overcurrent fault event refers to the zero-sequence current calculated by the three-phase current of the three-element high-voltage metering box detected, and the zero-sequence current value is greater than the current set value set for the ground overcurrent fault event and exceeds the set delay time;

[0026] The grounding over-limit fault event refers to the zero-sequence current calculated by the three-phase current of the three-element high-voltage metering box detected, and the zero-sequence current value is greater than the current set value set for the quick-break fault event and exceeds the set delay time;

[0027] The low voltage event refers to a phase / line voltage detected by the high-voltage metering box dropping from a normal value to less than a low voltage fault setting value and exceeding a set delay time.

[0028] Beneficial effects: The technical solution of this application has the following technical effects:

[0029] 1. The present invention installs a secondary device, a special transformer fault alarm instrument, on the special transformer metering point side, and installs it in a hanging meter style. Through the secondary junction box of the metering circuit, the reconstruction and construction during the normal operation of the line can be realized, without power outage, without affecting the power consumption on the user side, and the installation is convenient and the construction time is short, which is suitable for the reconstruction of old lines.

[0030] 2. The special transformer fault alarm instrument in the present invention can help power supply management personnel quickly locate the source of line faults, improve the efficiency of power supply line fault elimination, and shorten inspection time in actual production management by recording and sending SMS alarms for low voltage events and abnormal load current events (including quick-break fault events, overcurrent fault events, ground quick-break fault events, ground overcurrent fault events, and ground over-limit fault events).

[0031] 3. The dedicated transformer fault alarm in the present invention expands the power supply marketing department's management methods for over-capacity and breach of contract electricity consumption by recording user overload events and sending SMS alarms. Currently, the marketing system screens data on a monthly basis and issues fault elimination work orders, which has a lag and cannot change the over-capacity and breach of contract electricity consumption that has already occurred. The dedicated transformer fault alarm generates SMS alarms for real-time comparison, and the power supply management personnel can immediately contact the user to correct his or her over-capacity and breach of contract electricity consumption, making management more real-time.

[0032] 4. The special transformer fault alarm in the present invention records various abnormal power load events of the user, which can be queried by management personnel, providing basic analysis data for the rectification of power lines and equipment on the user side, realizing fault prevention management, and improving the reliability of power lines.

[0033] It should be appreciated that all combinations of the foregoing concepts, as well as additional concepts described in greater detail below, may be considered to be part of the inventive subject matter of the present disclosure, provided such concepts are not mutually inconsistent.

[0034] The foregoing and other aspects, embodiments and features of the present invention can be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent from the following description or learned from the practice of the specific embodiments according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For clarity, not every component is labeled in every figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, in which:

[0036] Figure 1 This is a schematic diagram of the principles of the invention device application scenario.

[0037] Figure 2 It is a schematic diagram of the structural principle of the present invention.

[0038] In the figure, the meanings of the reference numerals are as follows: Ⅰ, high-voltage metering box; Ⅱ, smart meter; Ⅲ, special transformer fault alarm instrument;

[0039] 1. Power module; 2. Core processing module; 3. Buttons; 4. LCD display; 5. LED indicator light; 6. SMS module; 7. Local maintenance port; 8. Event collection module. DETAILED DESCRIPTION

[0040] In order to better understand the technical content of the present invention, specific embodiments are cited and described as follows in conjunction with the accompanying drawings. Various aspects of the present invention are described in this disclosure with reference to the accompanying drawings, in which many illustrative embodiments are shown. The embodiments of the present disclosure are not necessarily intended to include all aspects of the present invention. It should be understood that the various concepts and embodiments introduced above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed in the present invention are not limited to any implementation. In addition, some aspects disclosed in the present invention can be used alone or in any appropriate combination with other aspects disclosed in the present invention.

[0041] like Figure 1-2 As shown, a device for managing abnormal user load at a dedicated transformer metering point includes a dedicated transformer fault alarm instrument III.

[0042] The special transformer fault alarm instrument III includes: a power supply module 1, a core processing module 2, a button 3, an LCD display screen 4, an LED indicator light 5, a text message module 6, a local maintenance port 7, and an event collection module 8.

[0043] Specifically, the power module 1 adopts AC85-264V power input and outputs three power supplies of DC12V, DC5V and DC3.3V to provide working power for various components in the special transformer fault alarm instrument III.

[0044] The core processing module 2 is AT91SAM9260 processor, 200MHz main frequency, 64MSDRAM, 64MNandFlash, multiple interfaces, and configured with Linux system.

[0045] The button 3 is connected to the core processing module 2 using an I / O interface to provide a human-computer interactive button input function for the special transformer fault alarm instrument III.

[0046] The LCD display screen 4 is connected to the core processing module 2 using an LCD bus interface to provide a human-computer interactive information display function for the special transformer fault alarm instrument III.

[0047] The LED indicator light 5 is connected to the core processing module 2 using an analog output interface to provide an operating status indication for the dedicated transformer fault alarm instrument III.

[0048] The SMS module 6 includes a GSM module chip M72D, which is connected to the core processing module 2 via an RS232 serial port to provide SMS input and output operations for the dedicated transformer fault alarm instrument III.

[0049] The local maintenance port 7 is connected to the core processing module 2 using an RJ45 network port to provide debugging and monitoring functions for the dedicated transformer fault alarm instrument III.

[0050] The event acquisition module 8 comprises an N32G452VEL7 chip with a 12-bit AD converter, 3 groups of voltage transformers, 3 groups of current transformers, and a signal sampling circuit, and is connected to the core processing module 2 using an RS485 interface; the event acquisition module 8 relies on the 12-bit AD of the MCU, collects 64 points per cycle of the power frequency, and uses the FFT algorithm to obtain the real-time values ​​of the three-phase voltage, current, and zero-sequence current, with an accuracy of up to 1%, and determines whether various abnormal events (including quick-break fault events, overcurrent fault events, overload events, ground quick-break fault events, ground overcurrent fault events, ground over-limit fault events, and low voltage events) have occurred, and provides voltage and current real-time sampling values ​​and abnormal event data for the special transformer fault alarm instrument III.

[0051] During the use of the special transformer fault alarm instrument III, the event acquisition module 8 first samples the three-phase voltage and current values ​​in real time, the zero-sequence current is calculated through the three-phase current vector, and the batch of sampled data is judged whether an abnormal event occurs according to the set event conditions; the core processing module 2 reads the real-time data detected by the event acquisition module 8 at regular intervals to realize the voltage and current monitoring function; the core processing module 2 reads the abnormal events detected by the event acquisition module 8 at regular intervals, generates abnormal event records for the abnormal events, and generates corresponding abnormal event alarm SMS for the abnormal events, which are sent to the set management personnel's mobile phone through the SMS module 6 to help the power supply management personnel quickly determine the location and type of the fault.

[0052] This embodiment discloses a method for managing abnormal user load at a dedicated transformer metering point, which is implemented by a dedicated transformer fault alarm instrument, as follows:

[0053] The fault alarm instrument pre-sets seven types of event parameters and determines whether an abnormal event occurs according to the set parameters. The detailed description is as follows:

[0054] 1) Quick-break fault events

[0055] Function: Input

[0056] Fixed value: 6-8*Ie (i.e. 6-8 times the rated current, which can be changed according to the actual load characteristics);

[0057] Delay: 0.00S (can be changed according to the actual load properties)

[0058] Description of this function: This function is in the input state. When the detected current of a certain phase is greater than the set value of the quick-break fault and exceeds the set delay time, it is judged as a quick-break fault, and a "quick-break fault" event is generated, and the corresponding event alarm SMS is sent to the set management personnel's mobile phone. The format of the SMS is: [Quick-break fault event] + user identification number + user name + UA / UB / UC voltage data + IA / IB / IC / I0 current data + event time.

[0059] 2) Overcurrent fault event

[0060] Function: Input

[0061] Fixed value: 3-4*Ie (i.e. 3-4 times the rated current, which can be changed according to the actual load characteristics);

[0062] Delay: 0.20-0.50S (can be changed according to the actual load properties)

[0063] This function description: This function is in the input state. When the detected phase current is greater than the overcurrent fault setting value and exceeds the set delay time, it is judged as an overcurrent fault, an "overcurrent fault" event is generated, and the corresponding event alarm SMS is sent to the set management personnel's mobile phone. The SMS format is: [overcurrent fault event] + user identification number + user name + UA / UB / UC voltage data + IA / IB / IC / I0 current data + event time.

[0064] 3) Overload event

[0065] Function: Input

[0066] Fixed value: 1-2*Ie (i.e. 1-2 times the rated current, which can be changed according to the actual load characteristics);

[0067] Delay: 1-10S (can be changed according to the actual load properties)

[0068] Description of this function: This function is in the enabled state. When the detected current of a phase is greater than the overload setting value and exceeds the set delay time, it is judged as overload, an "overload" event is generated, and a corresponding event alarm SMS is sent to the set management personnel's mobile phone. The SMS format is: [Overload event] + user identification number + user name + UA / UB / UC voltage data + IA / IB / IC / I0 current data + event time.

[0069] 4) Ground fault event

[0070] Function: Input

[0071] Fixed value: 3-4*Ie (i.e. 3-4 times the rated current, which can be changed according to the actual load characteristics);

[0072] Delay: 0.00S (can be changed according to the actual load properties)

[0073] This function description: This function is in the input state. When the detected zero-sequence current is greater than the set value of the grounding quick-break fault and exceeds the set delay time, the grounding quick-break fault is determined, and the "grounding quick-break fault" event is generated, and the corresponding event alarm SMS is sent to the set management personnel's mobile phone. The SMS format is: [grounding quick-break fault event] + user identification number + user name + UA / UB / UC voltage data + IA / IB / IC / I0 current data + event time.

[0074] 5) Ground overcurrent fault event

[0075] Function: Input

[0076] Fixed value: 1-2*Ie (i.e. 1-2 times the rated current, which can be changed according to the actual load characteristics);

[0077] Delay: 0.20-0.50S (can be changed according to the actual load properties)

[0078] Description of this function: This function is in the input state. When the detected zero-sequence current is greater than the set value of the ground overcurrent fault and exceeds the set delay time, the ground overcurrent fault is determined, a "ground overcurrent fault" event is generated, and the corresponding event alarm SMS is sent to the set management personnel's mobile phone. The SMS format is: [ground overcurrent fault event] + user identification number + user name + UA / UB / UC voltage data + IA / IB / IC / I0 current data + event time.

[0079] 6) Grounding over-limit fault event

[0080] Function: Input

[0081] Fixed value: 0.3-0.5*Ie (i.e. 0.3-0.5 times the rated current, which can be changed according to the actual load characteristics);

[0082] Delay: 1-10S (can be changed according to the actual load properties)

[0083] This function description: This function is in the input state. When the detected zero-sequence current is greater than the set value of the grounding over-limit fault and exceeds the set delay time, the grounding over-limit fault is determined, and the "grounding over-limit fault" event is generated, and the corresponding event alarm SMS is sent to the set management personnel's mobile phone. The SMS format is: [grounding over-limit fault event] + user identification number + user name + UA / UB / UC voltage data + IA / IB / IC / I0 current data + event time.

[0084] 7) Low voltage event

[0085] Function: Input

[0086] Fixed value: 0.8*Ue (i.e. 0.8 times the rated voltage, which can be changed according to the actual load characteristics);

[0087] Delay: 1-10S (can be changed according to the actual load properties)

[0088] Description of this function: This function is in the activated state. When the detected phase / line voltage drops from the normal value to less than the low voltage fault setting value and exceeds the set delay time, it is judged as a low voltage fault and a "low voltage fault" event is generated. When other abnormal current abnormal events (including quick-break fault events, overcurrent fault events, overload events, ground quick-break fault events, ground overcurrent fault events, and ground over-limit fault events) occur at the same time, the corresponding low voltage event alarm SMS is sent to the set management personnel's mobile phone. The format of the SMS is: [Low Voltage Event] + User ID + User Name + UA / UB / UC Voltage Data + IA / IB / IC / I0 Current Data + Event Time.

[0089] When judging the phase current event, the priority is: quick-break fault event > overcurrent fault event > overload event, and the higher one is judged instead of the lower one;

[0090] When judging zero-sequence current events, the priority is: grounding quick-break fault event > grounding over-limit fault event > grounding over-limit fault event, and the higher one is judged instead of the lower one;

[0091] The occurrence of the above events and the alarm text messages generated can help power supply line managers quickly locate the source of the fault, reduce line inspections, shorten fault elimination time, and increase line power supply time, which will have tangible benefits for social and economic activities.

[0092] Overload events can provide timely preventive management support for power supply departments.

[0093] The historical event records available for query in the special transformer fault alarm instrument can provide support for power supply line management.

[0094] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A method for managing abnormal user load at a dedicated transformer metering point, characterized in that: It includes a device for managing abnormal user load using a special transformer metering point, including a special transformer fault alarm instrument, the special transformer fault alarm instrument is installed in the secondary metering circuit of the high-voltage metering box, adopts a hanging meter installation method, and is connected with the smart meter in a voltage parallel and current series relationship. The special transformer fault alarm instrument includes a core processing module, an event collection module, a display module, an indication module, a text message module and a maintenance module. The core processing module is connected to the display module and the indication module respectively, and the core processing module is connected to the text message module, the event collection module and the maintenance module through three serial ports; The core processing module is a processor AT91SAM9260, which is used for data processing; The display module is an LCD dot matrix display screen, which is used to display information of the special transformer fault alarm instrument. The LCD dot matrix display screen is connected to the processor AT91SAM9260 using an LCD bus interface; The indication module is an LED indicator light, which is used to indicate the working status of the transformer fault alarm. The LED indicator light is connected to the processor AT91SAM9260 using an analog output interface. The SMS module includes a GSM module chip M72D, which is connected to the processor AT91SAM9260 using an RS232 serial port to provide SMS input and output operations; The maintenance module is a local maintenance port, which is connected to the processor AT91SAM9260 using an RJ45 network port to provide debugging and monitoring functions; The event acquisition module includes an N32G452VEL7 chip with a 12-bit AD converter, 3 sets of voltage transformers, 3 sets of current transformers, and a signal sampling circuit, and is connected to the processor AT91SAM9260 using an RS485 interface; the event acquisition module relies on the 12-bit AD of the MCU, collects 64 points per cycle of the power frequency, and uses the FFT algorithm to obtain the real-time values ​​of the three-phase voltage, current, and zero-sequence current, and determines whether various abnormal events occur, and provides real-time sampling values ​​of voltage and current and abnormal event data; It also includes a key, which is connected to the processor AT91SAM9260 using an I / O interface to provide a key input function for human-computer interaction; It also includes a power supply module, which uses AC85-264V power input and outputs three power supplies of DC12V, DC5V, and DC3.3V to provide working power for various components in the special transformer fault alarm instrument; The various abnormal events include quick-break fault events, overcurrent fault events, overload events, ground quick-break fault events, ground overcurrent fault events, ground overlimit fault events and low voltage events; The method process is as follows: the special transformer fault alarm instrument collects various voltage and current values ​​of the high-voltage metering box in real time to determine whether low voltage, various load current abnormalities, and over-capacity default electricity use occur; The judgment of whether low voltage, various types of load current abnormalities, and over-capacity default power consumption occur refers to judging in sequence whether it is a set quick-break fault event, overcurrent fault event, overload event, ground quick-break fault event, ground overcurrent fault event, ground over-limit fault event, and low voltage event. If the event conditions are met, the dedicated transformer fault alarm generates a corresponding event and sends a corresponding alarm SMS to the set power supply management personnel; The quick-break fault event refers to the detected current of a phase of the high-voltage metering box being greater than the current set value set for the quick-break fault event and exceeding the set delay time; The overcurrent fault event refers to the detected current of a phase of the high-voltage metering box being greater than the current set value set for the overcurrent fault event and exceeding the set delay time; The overload event refers to the current of a phase of the high-voltage metering box detected is greater than the current set value set for the overload event and exceeds the set delay time; The grounding quick-break fault event refers to the zero-sequence current calculated by the three-phase current of the three-element high-voltage metering box detected, and the zero-sequence current value is greater than the current set value set for the grounding quick-break fault event and exceeds the set delay time; The ground overcurrent fault event refers to the zero-sequence current calculated by the three-phase current of the three-element high-voltage metering box detected, and the zero-sequence current value is greater than the current set value set for the ground overcurrent fault event and exceeds the set delay time; The grounding over-limit fault event refers to the zero-sequence current calculated by the three-phase current of the three-element high-voltage metering box detected, and the zero-sequence current value is greater than the current set value set for the quick-break fault event and exceeds the set delay time; The low voltage event refers to a phase / line voltage detected by the high-voltage metering box dropping from a normal value to less than a low voltage fault setting value and exceeding a set delay time.

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