Terminal device and method for managing power factor and load of dedicated transformer users

Abstract

The present invention discloses a terminal device and method for managing the power factor and load of a dedicated transformer user, including an intelligent electricity management terminal, which is connected to a smart meter, a power load switch disconnection control unit and a power load switch disconnection indication alarm unit. The intelligent electricity management terminal periodically reads various electrical parameters of the smart meter for electricity fee calculation purposes, and provides abnormal SMS alarms for abnormal low power factor of the real-time power factor and the power factor of the current electricity fee calculation period, reminding users to improve the power factor of the power load, and provides two-level threshold value abnormal SMS alarms for excessive power load, until the final tripping and capacity reduction control, so as to help dedicated transformer users reduce power regulation charges and over-capacity electricity charges.

Description

Technical Field

[0001] The present invention relates to the field of electricity fee accounting in the electric power industry, and in particular to a terminal device for managing power factor and load of a dedicated transformer user. Background Art

[0002] At present, the power company adopts a two-part electricity fee accounting system for special transformer users, which includes power regulation fee and over-capacity usage fee. Power regulation fee is a special breach of contract fee charged when the total power factor of the user's electricity consumption in one electricity fee accounting cycle is lower than the assessment value agreed in the power supply and use contract. Over-capacity usage fee is a special breach of contract fee charged when the user's electricity consumption in one electricity fee accounting cycle exceeds the maximum allowable value of the rated load agreed in the power supply and use contract.

[0003] In actual production, the power distribution plan for dedicated transformer users generally adopts the high-voltage metering method on the 10KV incoming line side of the transformer, and performs reactive power compensation on the 0.4KV low-voltage outgoing line load side of the transformer. The power factor measured by the smart meter at the high-voltage metering point is not equal to the power factor measurement value on the low-voltage load side of the transformer, and the difference is a transformer loss variable.

[0004] The smart meters at the metering points of the power company are equipped with data collection systems, but they are only used internally by the company, and it is difficult for users to obtain them in a timely manner; the power company's marketing management system issues electricity bills for the previous month every month, and calculates the power factor value of the previous month based on the active and reactive energy indications measured by the meters, and assesses the excess capacity of the previous month based on the maximum demand data measured by the meters.

[0005] The measured value of the power factor meter on the low-voltage load side of the transformer managed by the user is only the instantaneous value of the power factor of the current power load. When users manage the reactive power compensation device, they need experienced professionals to patrol on duty to monitor the compensation effect of each load point, determine whether the reactive power compensation device is working properly, whether there is aging of the compensation capacitor, switch failure, unreasonable compensation at a certain load point, etc., and the management efficiency is low.

[0006] Users' autonomous load control management is usually based on the current value indicated by the three-phase ammeter installed on the low-voltage load side of the transformer. It also requires experienced professionals to monitor the load size manually and reduce the capacity in a timely manner, resulting in low management efficiency.

[0007] The effect of users managing power factor and load overcapacity this month will only be discovered after seeing the power company's detailed electricity bill next month. This has become an unchangeable fact, and no early warning can be provided when power factor and load are abnormal. Users generally hope that power companies can provide relevant technical support to improve management efficiency. Summary of the invention

[0008] The purpose of the present invention is to provide a terminal device and a management method that help dedicated transformer users improve power factor and maximum load management efficiency, so as to achieve the purpose of controlling power regulation charges and over-capacity electricity charges.

[0009] To achieve the above object, the present invention proposes the following technical solution: a terminal device for managing the power factor and load of a dedicated transformer user, the terminal device is an intelligent power management terminal, connected to a smart meter, a power load switch opening control unit, and a power load switch opening indication alarm unit;

[0010] The smart meter is used for electricity fee calculation. The smart electricity management terminal is connected to the smart meter via RS485 communication port. The smart electricity management terminal reads various electrical parameters of the smart meter at regular intervals and provides SMS alarms for abnormal low power factor in real time and abnormal power factor in the current electricity fee calculation period.

[0011] The power load switch disconnection control unit refers to a power load switch disconnection control circuit element of the power user (such as a disconnection control button), and the power consumption intelligent management terminal includes two groups of round relays, and the round relays use a pair of normally open / normally closed passive contacts to connect the power load switch disconnection control unit. The action of the round relay can realize the disconnection control operation of the power load switch;

[0012] The power load switch opening indication alarm unit refers to a control circuit element of the opening indication alarm device configured by the electricity user (such as the self-locking button of the audible and visual alarm control relay), and the electricity intelligent management terminal includes an alarm relay, which uses a pair of passive normally open contacts to connect the power load switch opening indication alarm unit. The closing action of the normally open contacts of the alarm relay can control the power load switch opening indication alarm unit to realize the opening indication alarm control operation.

[0013] Preferably, the intelligent power management terminal adopts an ARM core processing module, the processor of the ARM core processing module is AT91SAM9260, and the ARM core processing module is connected to peripherals such as a display screen, buttons, indicator lights and at least 4 serial ports.

[0014] Preferably, the display screen is an LCD dot matrix display screen, which is used for information display of the power consumption intelligent management terminal;

[0015] The button is used for information entry and function operation of the smart electricity management terminal;

[0016] The indicator light is an LED indicator light, which is used to indicate the working status of the power consumption intelligent management terminal;

[0017] The number of the serial ports is four, and the four serial ports include:

[0018] Serial port UART0 is connected with SMS communication module to realize SMS sending and receiving function;

[0019] Serial port UART1, used for local maintenance;

[0020] Serial port UART2 is used to communicate with the smart meter RS485 and read the smart meter electrical parameters;

[0021] The serial port DEBUG is connected to a round and alarm output module, which includes a single-chip microcomputer, two groups of round relays and a group of alarm relays. The single-chip microcomputer communicates with the ARM core processing module, receives instructions, and controls the actions of the two groups of round relays and a group of alarm relays. The passive normally open / normally closed contacts of the round relays are connected to the power load switch opening control unit to realize the opening operation, and the passive normally open contacts of the alarm output relay are connected to the power load switch opening indication alarm unit to realize the opening indication alarm input or exit operation.

[0022] Preferably, the number of connected power load switch disconnecting control units is at most two groups.

[0023] A method for managing the power factor of a dedicated transformer user, the method using the above-mentioned terminal device for managing the power factor and load of a dedicated transformer user, the power consumption intelligent management terminal periodically reads the three-phase current and total power factor real-time data of the smart meter, calculates and analyzes the real-time power factor and compares it with the power factor alarm value; the power consumption intelligent management terminal in the terminal device reads the total active power energy indication and the total reactive power energy indication data of the smart meter, calculates and analyzes the power factor of the current electricity fee accounting period and compares it with the power factor assessment value;

[0024] When the real-time power factor is lower than the real-time power factor alarm value and the power factor of the current electricity fee calculation period is lower than the power factor assessment value, the electricity intelligent management terminal sends a corresponding alarm text message to the set mobile phone number of the electricity management personnel.

[0025] Preferably, the real-time low power factor SMS alarm is a real-time feedback of the power factor of the power load, and its purpose is to remind the power management personnel that the current load power factor is too low, and they should actively manage the power factor compensation equipment to determine whether the reactive compensation device is working properly, whether there is aging of the compensation capacitor, switch failure, unreasonable compensation at a certain load point, etc. The low power factor SMS alarm in this electricity fee accounting period is the real assessment power factor feedback of the power load in this electricity fee accounting period, which is directly related to the occurrence of power-adjusting electricity fees, and its purpose is to remind the power management personnel to actively manage and plan the power factor of the later power load to reduce the amount of power-adjusting electricity fees.

[0026] The real-time low power factor SMS alarm is that the smart electricity management terminal periodically reads the real-time data of the three-phase current and total power factor of the smart meter. When the absolute value of any phase current is ≥ the set value (i.e.: the secondary rated current of the metering transformer * the load current threshold coefficient), and it is judged that the absolute value of the total power factor read this time is < the power factor alarm value, a real-time power factor abnormal event record is generated, and a real-time power factor alarm SMS is sent to the set mobile phone number of the electricity management personnel, in the format of: "[Real-time power factor alarm] Dear user, the real-time power factor of the current power load (A.AAA, B.BBB, C.CCC) is ±X.XX, too low!" (A.AAA, B.BBB, C.CCC are the three-phase current values ​​of the meter this time, and ±X.XX is the total power factor value of the meter this time). The real-time power factor abnormal event record is available for query.

[0027] The power factor low SMS alarm of this electricity bill accounting cycle is that the power consumption intelligent management terminal regularly reads the total active power value and the total reactive power value data of the smart meter, and the power consumption intelligent management terminal has the valid data records of the total active power value and the total reactive power value on the meter reading and accounting day in the most recent month, and calculates the power factor value of this electricity bill accounting cycle according to the formula:

[0028]

[0029] in:

[0030] ——Power factor value of this electricity fee calculation period;

[0031] W 有n ——It is the latest total active energy indication of the electric meter;

[0032] W 有0 ——The total active energy indication of the meter for calculating the daily energy recorded by the intelligent electricity management terminal in the latest month;

[0033] W 无n ——It is the latest total reactive energy indication of the electric meter;

[0034] W 无0 ——The total reactive energy indication of the meter reading and calculation day meter recorded by the power consumption intelligent management terminal in the latest month;

[0035] When the power factor value of this electricity bill calculation period When the power factor is less than the set power factor assessment value (usually the power factor assessment value approved by the power supply department), the abnormal power factor event record of this electricity billing cycle is generated, and the power factor alarm SMS of this electricity billing cycle is sent to the set mobile phone number of the electricity management personnel, with the format of "[Power factor alarm of this electricity billing cycle] Dear user, the current power factor of this electricity billing cycle is X.XX, which is lower than the assessment value Y.YY!" (where X.XX is the power factor value of this electricity billing cycle, and Y.YY is the set power factor assessment value). The abnormal power factor event record of this electricity billing cycle is available for query.

[0036] A method for managing the load of a dedicated transformer user, the method using the above-mentioned terminal device for managing the power factor and load of a dedicated transformer user, the power consumption intelligent management terminal regularly reads the three-phase voltage and current real-time data of the smart meter, calculates and analyzes the current load and compares it with the rated load two-level alarm value and the maximum load trip value respectively;

[0037] When the current load is greater than the two-level alarm value of the rated load, the power consumption intelligent management terminal sends a corresponding alarm text message to the set mobile phone number of the power consumption management personnel.

[0038] When the current load is greater than the maximum load tripping value, the intelligent electricity management terminal sends a pre-tripping alarm SMS to the set mobile phone number of the electricity management personnel to remind the user that the current electricity load has exceeded the maximum load tripping value and that the electricity load should be reduced immediately. If after the set delay time, the read current load is still greater than the maximum load tripping value, the intelligent electricity management terminal will generate a round output to implement the tripping operation to achieve the control purpose of capacity reduction.

[0039] Preferably, the judgment alarm of the current load being greater than the two-level alarm value of the rated load is intended to remind the user that the current power load is close to the rated load and that the user should pay attention to controlling the continued increase of the power load. The pre-trip alarm of the current load being greater than the maximum load trip value and the delayed trip output operation of the power consumption intelligent management terminal are intended to achieve active or passive capacity reduction of the user's power load to control the occurrence of over-capacity electricity charges.

[0040] The current load is greater than the two-level alarm value of the rated load. The intelligent power management terminal periodically reads the three-phase voltage and current real-time data of the smart meter and calculates the current power load. The current power load (i.e., the primary circuit apparent power) is calculated as follows:

[0041] When the metering transformer is in the three-phase four-wire three-element metering mode, the following calculation formula is used for calculation:

[0042] S=(|UA|*|IA|+|UB|*|IB|+|UC|*|IC|)*B PT *BCT / 1000

[0043] When the metering transformer is in the three-phase three-wire two-element metering mode, the following calculation formula is used:

[0044] S=(|UA|*|IA|+|UC|*|IC|) / 2*√3*B PT *B CT / 1000

[0045] in:

[0046] Metering method of metering transformer - input item, three-phase four-wire three-element / three-phase three-wire two-element optional.

[0047] S——apparent power of primary circuit, unit is KVA, KVA=KW.

[0048] UA, IA, UB, IB, UC, IC——refer to the three-phase voltage and current sampling values ​​​​of the electricity meter read by the electricity consumption intelligent management terminal this time; the voltage unit is V and the current unit is A.

[0049] B PT ——It is the voltage ratio, which refers to the voltage ratio of the measuring transformer, voltage ratio B PT =primary rated line voltage / secondary rated line voltage, primary rated line voltage and secondary rated line voltage are input items.

[0050] B CT —— is the current ratio, which refers to the current ratio of the measuring transformer, the current ratio B CT =primary rated current / secondary rated current, primary rated current and secondary rated current are input items.

[0051] When the primary circuit apparent power ≥ (user rated load * load over limit alarm coefficient 1), a load over limit alarm 1 abnormal event record is generated, and a load over limit alarm 1 alarm SMS is sent to the set mobile phone number of the power management personnel, in the format of: "[Load over limit alarm 1] Dear user, the current power load is XXXXXXKVA, which is greater than the alarm value YYYYYYKVA!", (XXXXXX is the current power load value, YYYYYY = user rated load * load over limit alarm coefficient 1);

[0052] When the primary circuit apparent power ≥ (user rated load * load over limit alarm coefficient 2), a load over limit alarm 2 abnormal event record is generated, and a load over limit alarm 2 alarm SMS is sent to the set mobile phone number of the power management personnel, in the format of: "[Load over limit alarm 2] Dear user, the current power load is XXXXXXKVA, which is greater than the alarm value YYYYYYKVA!" (XXXXXX is the current power load value, YYYYYY = user rated load * load over limit alarm coefficient 2);

[0053] When the primary circuit apparent power ≥ the maximum load trip value (i.e. user rated load * load overlimit trip coefficient), a load overlimit pre-trip alarm abnormal event record is generated, and a load overlimit pre-trip alarm SMS is sent to the set mobile phone number of the electricity management personnel, in the format of: "[Load overlimit pre-trip alarm] Dear user, the current power load is XXXXXXKVA, which is greater than the load overlimit trip value YYYYYYKVA, and the terminal will perform a trip operation!" (XXXXXX is the current power load value, YYYYYY = user rated load * load overlimit trip coefficient); at the same time, the alarm relay is energized to control the connected power load switch trip indication alarm unit to realize the trip indication alarm function

[0054] And start the load overlimit trip delay judgment. When the set delay time is reached (input item "load overlimit trip delay: XXXmin"), the power consumption intelligent management terminal detects the current load (apparent power) again. If it still exceeds the set maximum load trip value, it will generate a load overlimit trip abnormal event record and send a load overlimit trip alarm SMS to the set power consumption management personnel's mobile phone number. The format is: "[Load overlimit trip] Dear user, the current power load is XXXXXXKVA, which is greater than the load overlimit trip value YYYYYYKVA, and the terminal has performed a trip operation!" (XXXXXX is the current power load value, YYYYYY is the current power load value, and YYYYYY is the current power load value. = User rated load * load overlimit trip coefficient); at the same time, the round 1 relay of the power consumption intelligent management terminal is energized to realize the opening operation of the load switch corresponding to round 1; after a delay of 5 minutes, the power consumption intelligent management terminal detects the current load (apparent power) again. If it still exceeds the set maximum load trip value, the round 2 relay is energized to realize the opening operation of the load switch corresponding to round 2, until the current load (apparent power) is detected again to be less than the set maximum load trip value. The power consumption intelligent management terminal closes the record of the abnormal event of overload overlimit tripping, and releases the opening control of the power load switch 1 and 2 opening control units through the round 1 and 2 relays. Otherwise, the power consumption intelligent management terminal will maintain the current round port control state.

[0055] Beneficial effects: The technical solution of this application has the following technical effects: 1. The intelligent meter for metering and accounting is used to provide data services for users. It is the same source as the electricity bill accounting data of the power company, with high accuracy, avoiding basic data errors and reducing the resulting power supply and use disputes. Provide users with real-time power factor monitoring, and send real-time low power abnormal text messages in time, which improves the user's fault elimination response speed, reduces the difficulty of manual management, and improves management efficiency. Provide users with power factor monitoring for the current electricity bill accounting cycle, and send daily text messages for abnormal low power factor in the current electricity bill accounting cycle to remind users to plan for later power loads, improve management timeliness, reduce the difficulty of manual management, and improve management efficiency.

[0056] 2. Provide users with load monitoring, realize two-level SMS warning of load, and realize load over-limit tripping and capacity reduction control management, which improves the timeliness of management, reduces the difficulty of manual management, and improves management efficiency.

[0057] 3. Ultimately, the goal of reducing power adjustment charges and over-capacity charges for users is achieved, which reduces electricity costs and saves money. It solves the "last mile" of user information services for power companies, increases the marketing service content and service methods of power companies, makes power users feel the atmosphere of "clear consumption", harmonizes the relationship between power supply and use, improves the service efficiency of power companies, and improves user satisfaction.

[0058] 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.

[0059] 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

[0060] 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:

[0061] Figure 1 It is a schematic diagram of the structure of the present invention.

[0062] Figure 2 This is a functional architecture diagram of the terminal of the present invention.

[0063] In the figure, the meaning of each reference numeral is as follows: Ⅰ, intelligent power management terminal; Ⅱ, smart meter; Ⅲ, user load trip indication alarm unit; Ⅳ, user load switch 2 trip control unit; Ⅴ, user load switch 1 trip control unit; 1, power module; 2, AT91SAM9260 core processing module; 3, debugging port; 4, external clock; 5, button; 6, LCD display; 7, LED indicator; 8, SMS communication module; 9, local maintenance port; 10, round and alarm output module. DETAILED DESCRIPTION

[0064] 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.

[0065] A terminal device for managing power factor and load of a dedicated transformer user comprises an intelligent power management terminal I, an intelligent electric meter II, a user load trip indication alarm unit III, a user load switch 2 trip control unit IV, and a user load switch 1 trip control unit V.

[0066] The power consumption intelligent management terminal I comprises: a power supply module 1, an AT91SAM9260 core processing module 2, a debugging port 3, an external clock 4, a button 5, an LCD display screen 6, an LED indicator light 7, a short message communication module 8, a local maintenance port 9, and a round and alarm output module 10.

[0067] Specifically, the power module 1 adopts AC90-260V wide power input, outputs DC12V, DC5V, and DC3.3V, and provides working power for various components in the smart power management terminal I.

[0068] AT91SAM9260 core processing module 2, using industrial-grade AT91SAM9260 processor, 200MHz main frequency, 64MSDRAM, 128MNandFlash, multiple interfaces, installed Linux system.

[0069] The debugging port 3 is connected to the AT91SAM9260 core processing module 2 using an RJ45 network port to implement program read and write debugging functions.

[0070] The external clock 4 adopts I2 C interface is connected to the AT91SAM9260 core processing module 2 to provide a clock reference for the system.

[0071] The button 5 is connected to the AT91SAM9260 core processing module 2 using an I / O interface to provide a six-key input operation for the system.

[0072] The LCD display screen 6 is connected to the AT91SAM9260 core processing module 2 using an LCD bus interface to provide information display function for the system.

[0073] The LED indicator light 7 is connected to the AT91SAM9260 core processing module 2 using an analog output (I / O port driven by TTL) interface to provide the system with an operating information indication function.

[0074] The SMS communication module 8 includes a GSM module chip M72D, which is connected to the AT91SAM9260 core processing module 2 via an RS232 serial port to provide SMS input and output operations for the system.

[0075] The local maintenance port 9 is connected to the AT91SAM9260 core processing module 2 via an RS232 serial port to provide a debugging and monitoring function for the system.

[0076] The round and alarm output module 10 includes an ST8-bit MCU, 3 groups of AC220V8A relays, and is connected to the AT91SAM9260 core processing module 2 using an RS232 interface, providing the system with two round relays with normally open and normally closed passive contact outputs and one alarm relay with normally open passive contact output, thereby realizing two round and alarm control functions.

[0077] The smart meter II is configured for the power department and installed at the metering point at the property boundary of the dedicated transformer user. It is an electricity bill settlement meter that complies with the DL / T614-2007 "Multi-function Electric Energy Meter" standard, has an RS485 communication port, and provides voltage, current, power, power factor, active / reactive electric energy indication and other parameter data in accordance with the DL / T645-2007 "Multi-function Electric Energy Meter Communication Protocol" standard.

[0078] The user load trip indication alarm unit III refers to the sound and light alarm configured when the user has an on-site sound and light alarm prompt for tripping. It is connected to the normally open contact of the alarm relay in the power consumption intelligent management terminal I-round and alarm output module 10. When the normally open contact of the alarm relay is closed, the sound and light alarm is put into operation to realize the user load trip indication sound and light alarm function.

[0079] The user load switch 2 disconnection control unit IV and the user load switch 1 disconnection control unit V refer to the electric disconnection control circuits of the two heavy-load production power switches selected by the user side when the load is over-limit tripped, such as the normally open disconnection button, which are connected in parallel to the normally open passive contacts of the rounds 1 and 2 relays in the round and alarm output module 10 of the power consumption intelligent management terminal I. When the normally open contacts of the rounds 1 and 2 relays are closed, the disconnection operation of the corresponding two switches is realized to cut off the corresponding load and realize the load reduction operation. The action sequence of load over-limit tripping is round 1 first and then round 2. Usually, important and low-load safety-related electricity consumption is not targeted for capacity reduction.

[0080] During the use of the above-mentioned terminal equipment, especially for managing the user's power factor, the power consumption intelligent management terminal I regularly reads the three-phase current, total power factor and other parameters of the smart meter II, and performs calculations and analysis according to the pre-set real-time power factor alarm value. For users with load current and real-time power factor that is too low, a real-time power factor abnormal event record is generated, and the current real-time power factor data and low power factor alarm text message are sent to the set mobile phone number of the power consumption management personnel to remind the user's power consumption management personnel to actively manage the power factor compensation equipment.

[0081] In addition, the smart electricity management terminal Ⅰ reads the total active energy indication, total reactive energy indication and other parameters of the smart meter Ⅱ on a daily basis, and performs calculations and analysis according to the power factor assessment value approved by the power supply department. If the power factor of the current electricity billing cycle is too low, a record of abnormal power factor events for the current electricity billing cycle is generated, and the power factor data of the current electricity billing cycle and a low power alarm text message are sent every day to the set mobile phone number of the electricity management personnel to remind the user's electricity management personnel to actively manage and plan the power factor of the later electricity load.

[0082] During the use of the above-mentioned terminal equipment, especially for managing user loads, the intelligent electricity management terminal I regularly reads the voltage, current and other parameters of the smart meter II, and performs calculations and analysis according to the set two-level alarm values ​​of the rated load (generally 70% and 90% of the rated load approved by the power supply department). For power consumption situations where the current load is too large and exceeds the two-level alarm values ​​of the rated load, a load exceeding alarm value abnormal event record is generated, and the current load (apparent power) data and the alarm value exceeding alarm value alarm SMS are sent to the set mobile phone number of the electricity management personnel to remind the user's electricity management personnel to actively manage the electricity load.

[0083] In addition, the intelligent electricity management terminal I regularly reads the voltage, current and other parameters of the smart meter II, and performs calculations and analysis according to the set maximum load tripping value (the maximum allowable rated load approved by the power supply department is 120%, usually set to 110%). For the current load that is too large and exceeds the maximum load tripping value, a load over-limit pre-tripping abnormal event record is generated, and the current load (apparent power) data and load over-limit pre-tripping alarm SMS are sent to the set mobile phone number of the electricity management personnel, and the normally open contacts of the alarm relay of the intelligent electricity management terminal I - round and alarm output module are changed to closed operations to control the power load switch opening indication alarm unit to enter the opening indication alarm working state, reminding users that the power management personnel should immediately reduce the current power load.

[0084] After the set delay time, the power consumption intelligent management terminal I detects the current load again. If it still exceeds the set maximum load tripping value, it generates a load overlimit tripping abnormal event record, sends the current load (apparent power) data and the load overlimit tripping SMS exceeding the maximum load tripping value to the set mobile phone number of the power consumption management personnel, and closes the round 1 relay of the round and alarm output module of the power consumption intelligent management terminal I. The contact action of the round 1 relay will control the power load switch 1 opening control unit to start the opening operation, so as to cut off the power load controlled by round 1 and realize the capacity reduction operation.

[0085] After a delay of 5 minutes, the intelligent power management terminal I detects the current load (apparent power). If it still exceeds the set maximum load tripping value, the round 2 relay will be energized to cut off the power load controlled by round 2, and force the circuit breaker to open and reduce the capacity again.

[0086] Until the current load (apparent power) is detected again to be less than the set maximum load trip value, the power consumption intelligent management terminal I will close the record of the load overload trip abnormal event and release the opening control of the power load switch 1 and 2 opening control unit through the round 1 and 2 relays. Otherwise, the power consumption intelligent management terminal I will maintain the current round port control state.

[0087] The various abnormal event records generated by the smart electricity management terminal I can be queried by category, and the occurrence and end time, as well as the electrical parameters of the smart meter II read when the event occurs, can be recorded for users to query, providing data support for users' statistical analysis and optimization of electricity consumption.

[0088] This embodiment discloses a method for managing user power factor and load. Specifically, the management of user power factor and load is implemented by an intelligent power management terminal. Figure 2As shown, the power consumption intelligent management terminal includes meter configuration function, parameter setting function, real-time power factor monitoring function, power factor monitoring function of this electricity fee calculation cycle, load over-limit monitoring and control function, and data query function, which are described in detail as follows:

[0089] 1. Electric meter configuration function

[0090] 1.1. Input the following data on the interface:

[0091] Port: 485-1;

[0092] Table number: XXXXXXXXXXXX (12 A's by default, 0-FFFFFFFFFFFF can be set);

[0093] Protocol type: DL / T645-2007;

[0094] Communication rate: 19200, 9600, 7200, 4800, 2400, 1200, 600 (pull-down selectable, default 2400);

[0095] Measuring direction: forward and reverse are optional (forward by default, optional by pull-down);

[0096] Meter reading interval: 15min, 30min, 1h, 2h (pull down to select, default 15min)

[0097] Monthly meter reading settlement date: 1-28 (settable, default: 1).

[0098] 1.2、Functional description:

[0099] The intelligent electricity management terminal communicates with the smart meter according to the input port, meter number, protocol, and communication rate, and reads the three-phase voltage, current, active / reactive power, power factor and active / reactive total power, total power factor, forward / reverse active total electric energy indication (read according to the set metering direction), forward / reverse reactive total electric energy indication (read according to the set metering direction), and forward and reverse active maximum demand according to the set meter reading interval and metering direction, and saves the data for subsequent processing and query.

[0100] 2. Parameter setting function

[0101] 2.1. Input the following data on the interface:

[0102] 1) Metering transformer configuration:

[0103] Metering method: three-phase four-wire three-element, three-phase three-wire two-element (pull-down selectable, three-phase four-wire three-element by default).

[0104] Primary rated line voltage: 10KV, 35KV, 0.4KV (pull-down optional, default 10KV);

[0105] Secondary rated line voltage: 0.1KV, 0.4KV (pull-down optional, default 0.1KV) (Note: if the primary rated line voltage is 0.4KV, the secondary rated line voltage must be 0.4KV);

[0106] Primary rated current: XXXX.XA (the default is 0000.0A, which can be set. When saving, if it is judged not to be 2.5, 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 75, 80, 100, 120, 125, 150, 200, 250, 300, 400, 500, 600, 750, 800, 1000, 1200, 1250, 1500, 2000, 2500, 3000 series, it will prompt “rated current is not in the preferred series”, and it will not be saved and wait for re-entry);

[0107] Secondary rated current: 5A, 1A (pull-down optional, default 5A).

[0108] 2) Load setting:

[0109] User rated load: XXXXXXkva (default 000000, configurable) (Note: 000000, means not set);

[0110] Load current threshold coefficient: X.XX (default 0.10, adjustable);

[0111] 3) User mobile phone number setting:

[0112] Mobile phone number 1: XXXXXXXXXXX (default: 11 zeros (indicates this number is invalid), configurable);

[0113] Mobile phone number 2: XXXXXXXXXXX (default: 11 zeros (indicates this number is invalid), configurable);

[0114] Mobile phone number 3: XXXXXXXXXXX (default: 11 zeros (indicates this number is invalid), configurable);

[0115] Mobile phone number 4: XXXXXXXXXXX (default: 11 zeros (indicates this number is invalid), configurable);

[0116] Mobile phone number 5: XXXXXXXXXXX (Default: 11 zeros (indicates this number is invalid), can be set). 2.2. Function description:

[0117] The above data shall be correctly input and saved according to the actual situation on site for subsequent processing and inquiry.

[0118] 3. Real-time power factor monitoring function

[0119] 3.1. Input the following data on the interface: Real-time power factor over-limit alarm: On, Off (default off, optional).

[0120] Power factor alarm value: X.XX (default 0.00, indicating disabled, adjustable).

[0121] 3.2 Working Principle

[0122] The intelligent electricity management terminal regularly reads the three-phase current, total power factor and other parameters of the smart meter, and performs calculations and analysis according to the pre-set real-time power factor alarm value. If the user has load current and the real-time power factor is too low, it generates a real-time power factor abnormal event record, sends the current real-time power factor data and the low power factor alarm SMS to the set mobile phone number of the electricity management personnel, and reminds the user's electricity management personnel to actively manage the power factor compensation equipment.

[0123] 3.3、Principles of this function

[0124] When the following conditions are met:

[0125] 1) Real-time power factor over-limit alarm is activated;

[0126] 2) Power factor alarm value>0.00;

[0127] 3) The absolute value of any phase current in the three-phase current ≥ (metering transformer secondary rated current * load current threshold coefficient);

[0128] Perform subsequent calculation and analysis of the real-time power factor abnormal alarm function, otherwise no subsequent calculation and analysis will be performed.

[0129] When the absolute value of the total power factor read from the meter is less than the power factor alarm value, a real-time power factor abnormal event record is generated, and the start time and end time of the event, as well as the electrical parameters of the smart meter read at the start time (including three-phase voltage, current, active / reactive power, power factor and total active / reactive power, total power factor, forward / reverse active total energy indication, forward / reverse reactive total energy indication, and forward and reverse active maximum demand) are recorded and saved.

[0130] Send a real-time power factor alarm SMS in the format of: "[Real-time power factor alarm] Dear user, the real-time power factor of the current power load (A.AAA, B.BBB, C.CCC) is ±X.XX, too low!" (A.AAA, B.BBB, C.CCC are the three-phase current values ​​of the meter, and ±X.XX is the total power factor value of the meter). The SMS is sent to up to 5 numbers set in "User mobile number settings" (a mobile number with all 0s is an invalid number).

[0131] Note: Continuous real-time power factor anomalies are recorded as the same event record until the absolute value of the total power factor of the meter is read ≥ the power factor alarm value. This is recorded as the end time of this event record, but subsequent meter data is not saved in the event record.

[0132] Real-time power factor anomaly records occur continuously. For the first three abnormalities, an alarm SMS will be sent. No SMS will be sent for subsequent abnormalities.

[0133] 4. Power factor monitoring function during the electricity bill calculation cycle

[0134] 4.1. Input the following data on the interface:

[0135] Power factor over-limit alarm for this electricity bill calculation period: Enable, disable (default, optional);

[0136] Power factor assessment value: X.XX (default 0.00, indicating no assessment, can be set).

[0137] Alarm time: XX o'clock (default 8 o'clock, 24-hour format, adjustable).

[0138] 4.2 Working principle:

[0139] The smart electricity management terminal reads the total active energy indication, total reactive energy indication and other parameters of the smart meter on a daily basis, calculates and analyzes the power factor assessment value approved by the power supply department, and generates a record of abnormal power factor events for the current electricity billing period if the power factor is too low. The terminal sends the power factor data of the current electricity billing period and a text message of an alarm indicating that the power factor is too low to the set mobile phone number of the electricity management personnel every day, reminding the user's electricity management personnel to actively manage and plan the power factor of the later electricity load.

[0140] 4.3、Principles of this function:

[0141] When the following conditions are met:

[0142] 1) The power factor over-limit alarm is activated during this electricity fee calculation period;

[0143] 2) Power factor assessment value>0.00;

[0144] 3) The system hourly time of the day is ≥ the alarm time for the first time;

[0145] 4) The valid data records of total active energy indication and total reactive energy indication are available on the meter reading calculation day in the most recent month;

[0146] Perform subsequent calculation and analysis of the power factor over-limit alarm for this electricity billing period, otherwise no subsequent calculation and analysis will be performed.

[0147] Calculate and save the power factor value of the current electricity bill calculation period. The calculation formula is:

[0148] in: ——The power factor value of the current electricity bill calculation period;

[0149] W 有n ——The latest total active energy indication of the meter on that day;

[0150] W 有0 ——Calculate the total active energy indication of the daily meter for the most recent month;

[0151] W 无n ——The latest total reactive energy indication of the meter on that day;

[0152] W 无0 ——Calculate the total reactive energy indication of the solar meter for the most recent month;

[0153] The power factor value of the electricity bill calculation period on a certain day When the power factor is less than the assessment value, a record of abnormal power factor event in the electricity fee accounting period is generated, and the start time and end time of the event, as well as the smart meter electrical parameters read at the start time (including three-phase voltage, current, active / reactive power, power factor and active / reactive total power, total power factor, forward / reverse active total energy indication, forward / reverse reactive total energy indication, and forward and reverse active maximum demand) are recorded and saved;

[0154] Send a power factor alarm SMS for this electricity billing cycle in the format of: "[Power factor alarm for this electricity billing cycle] Dear user, the current power factor for this electricity billing cycle is X.XX, which is lower than the assessment value Y.YY!" (X.XX is the power factor value for the current electricity billing cycle, and Y.YY is the set power factor assessment value). The SMS is sent to up to 5 numbers set in "User mobile number settings" (a mobile number with all 0s is an invalid number).

[0155] Note: Continuous abnormal power factor records for this electricity billing cycle are recorded as the same event record until the power factor of the current electricity billing cycle calculated on a certain day is ≥ the power factor assessment value. This is recorded as the deadline for this event record, but subsequent meter data are not saved in the event record.

[0156] The power factor for this electricity billing cycle is calculated once a day. If it is abnormal, an alarm text message will be sent.

[0157] 5. Load over-limit alarm and control function

[0158] 5.1. Input the following data on the interface:

[0159] Load over limit alarm: on, off (default on, optional;

[0160] Load overload alarm coefficient 1: X.XX (default 0.70, adjustable);

[0161] Load overload alarm coefficient 2: X.XX (default 0.90, adjustable);

[0162] Load over limit tripping: On, Off (Off by default, optional; if "On", the associated "Load over limit alarm" must be set to "On");

[0163] Load overload trip coefficient: X.XX (default 1.10, adjustable);

[0164] Load overload tripping delay: XXXmin (default 30, adjustable);

[0165] 5.2 Working principle:

[0166] The intelligent electricity management terminal regularly reads the voltage, current and other parameters of the smart meter, and performs calculations and analysis according to the set two-level alarm values ​​of the rated load (generally 70% and 90% of the rated load approved by the power supply department). When the current load is too large and exceeds the two-level rated alarm values, a load exceeding alarm value abnormal event record is generated, and the current load (apparent power) data and the alarm value exceeding alarm value alarm SMS are sent to the set mobile phone number of the electricity management personnel to remind the user's electricity management personnel to actively manage the electricity load.

[0167] The intelligent power management terminal periodically reads the voltage, current and other parameters of the smart meter, and performs calculation and analysis according to the set maximum load trip value (user rated load * load overlimit trip coefficient, the maximum allowable load of the general power supply department is 120% of the rated load, so the load overlimit trip coefficient is usually set to 110%). For the current load that is too large and exceeds the maximum load trip value, it generates a load overlimit pre-trip abnormal event record, sends the current load (apparent power) data and load overlimit pre-trip alarm SMS to the set mobile phone number of the power management personnel, and operates the normally open contact of the alarm relay of the power management terminal-round and alarm output module to close, so as to control the power load switch opening indication alarm unit to start the indication alarm work, and remind the user power management personnel that they should immediately reduce the current power load;

[0168] After the set delay time, the power consumption intelligent management terminal detects the current load again. If it still exceeds the set maximum load tripping value, a load over-limit tripping abnormal event record is generated, and the current load (apparent power) data and the load over-limit tripping SMS exceeding the maximum load tripping value are sent to the set mobile phone number of the power consumption management personnel, and the round 1 relay of the power consumption intelligent management terminal - round and alarm output module is energized. The contact action of the round 1 relay will control the power load switch 1 opening control unit to start the opening operation, so as to cut off the power load corresponding to round 1 and realize the capacity reduction operation.

[0169] After a delay of 5 minutes, the intelligent power management terminal detects the current apparent power again. If it still exceeds the set maximum load tripping value, the round 2 relay will be energized to cut off the power load controlled by round 2, and the circuit breaker will be forced to reduce the capacity again.

[0170] Until the current load is detected to be less than the set maximum load trip value again, the power consumption intelligent management terminal will close the load overload trip abnormal event record and release the opening control of the power load switch 1 and 2 opening control unit through the round 1 and 2 relays. Otherwise, the power consumption intelligent management terminal will maintain the current round port control state.

[0171] 5.3. Principles of this function:

[0172] When the following conditions are met:

[0173] 1) Load over limit alarm is activated;

[0174] 2) User rated load value>0;

[0175] 3) Load over-limit alarm coefficient 1>0;

[0176] 4) Load over-limit alarm coefficient 2>0;

[0177] Perform subsequent calculation and analysis of this function, otherwise no subsequent calculation and analysis will be performed.

[0178] Calculate the apparent power of the primary circuit of the current power load

[0179] 1) When the metering transformer is in the three-phase four-wire three-element measurement mode, calculate according to the following formula:

[0180] S=(|UA|*|IA|+|UB|*|IB|+|UC|*|IC|)*B PT *B CT / 1000

[0181] 2) When the metering transformer is in the three-phase three-wire two-element metering mode, calculate according to the following formula:

[0182] S=(|UA|*|IA|+|UC|*|IC|) / 2*√3*B PT *B CT / 1000

[0183] in:

[0184] S——apparent power of primary circuit, unit is KVA, KVA=KW.

[0185] UA, IA, UB, IB, UC, IC——refer to the sampling value of the electric meter read by the intelligent electricity management terminal this time; the voltage unit is V and the current unit is A.

[0186] B PT ——It is the voltage ratio, which refers to the voltage ratio of the measuring transformer, voltage ratio B PT =primary rated line voltage / secondary rated line voltage, primary rated line voltage and secondary rated line voltage are input items.

[0187] B CT —— is the current ratio, which refers to the current ratio of the measuring transformer, the current ratio B CT =primary rated current / secondary rated current, primary rated current and secondary rated current are input items.

[0188] When the primary circuit apparent power ≥ (user rated load * load overlimit alarm coefficient 1), a load overlimit alarm 1 abnormal event record is generated, and the start time and end time of the event, as well as the smart meter electrical parameters read at the start time (including three-phase voltage, current, active / reactive power, power factor and active / reactive total power, total power factor, forward / reverse active total energy indication, forward / reverse reactive total energy indication, forward and reverse active maximum demand) are recorded and saved; a load overlimit alarm 1 alarm SMS is sent, the format is: "[Load overlimit alarm 1] Dear user, the current power load is XXXXXXKVA, which is greater than the alarm value YYYYYYKVA!", (XXXXXX is the current power load value, YYYYYY = user rated load * load overlimit alarm coefficient 1), and the SMS is sent to up to 5 numbers set in "User mobile phone number setting" (mobile phone number with all 0s is an invalid number).

[0189] Remark:

[0190] Continuous load overlimit alarm 1 abnormal records are recorded as the same event record until the apparent power of the current primary circuit is less than (user rated load * load overlimit alarm coefficient 1), which is recorded as the end time of this event record, but subsequent meter data is not saved in the event record.

[0191] For the continuous abnormal records of load overlimit alarm 1, an alarm SMS will be sent once for each of the first three scheduled meter readings and will not be sent again subsequently.

[0192] When the primary circuit apparent power ≥ (user rated load * load overlimit alarm coefficient 2), a load overlimit alarm 2 abnormal event record is generated, and the start time and end time of the event, as well as the smart meter electrical parameters read at the start time (including three-phase voltage, current, active / reactive power, power factor and active / reactive total power, total power factor, forward / reverse active total energy indication, forward / reverse reactive total energy indication, forward and reverse active maximum demand) are recorded and saved; a load overlimit alarm 2 alarm SMS is sent in the format of: "[Load overlimit alarm 2] Dear user, the current power load is XXXXXXKVA, which is greater than the alarm value YYYYYYKVA!" (XXXXXX is the current power load value, YYYYYY = user rated load * load overlimit alarm coefficient 2), and the SMS is sent to up to 5 numbers set in "User mobile phone number setting" (mobile phone number with all 0s is an invalid number).

[0193] Remark:

[0194] The continuous occurrence of load overlimit alarm 2 abnormal records are recorded as the same event record until the apparent power of the current circuit is less than (user rated load * load overlimit alarm coefficient 2), which is recorded as the end time of this event record, but the subsequent meter data is not saved in the event record.

[0195] For the continuous abnormal records of load overlimit alarm 2, an alarm SMS will be sent once for each of the first three scheduled meter readings and will not be sent again subsequently.

[0196] When the load overload trip is enabled and the primary circuit apparent power ≥ (user rated load * load overload trip coefficient), the following processing is performed:

[0197] A. Generate a load overload pre-trip alarm abnormal event record, record and save the start time and end time of this event, and the smart meter electrical parameters read at the start time (including three-phase voltage, current, active / reactive power, power factor and active / reactive total power, total power factor, forward / reverse active total energy indication, forward / reverse reactive total energy indication, and forward and reverse active maximum demand);

[0198] B. Send a load overlimit pre-trip alarm SMS in the format of: "[Load overlimit pre-trip alarm] Dear user, the current power load is XXXXXXKVA, which is greater than the load overlimit trip value YYYYYYKVA, and the terminal will perform a trip operation!" (XXXXXX is the current power load value, YYYYYY = user rated load * load overlimit trip coefficient). The SMS is sent to up to 5 numbers set in the "User Mobile Number Settings" (a mobile number with all 0s is an invalid number).

[0199] C. Start the load overload trip delay judgment. When the set delay time is reached (input item "load overload trip delay: XXXmin"), the power consumption intelligent management terminal detects the current load again. If it still exceeds the set maximum load trip value, the sequence is as follows:

[0200] C1) Generate a load overload trip abnormal event record, record and save the start time and end time of this event, and the smart meter electrical parameters read at the start time (including three-phase voltage, current, active / reactive power, power factor and active / reactive total power, total power factor, forward / reverse active total energy display)

[0201] value, total forward / reverse reactive energy indication, maximum forward and reverse active energy demand);

[0202] C2) Send a load over-limit trip alarm SMS in the format of: "[Load over-limit trip] Dear user, the current power load is XXXXXXKVA, which is greater than the load over-limit trip value YYYYYYKVA, and the terminal has performed a trip operation!" (XXXXXX is the current power load value, YYYYYY = user rated load * load over-limit trip coefficient). The SMS is sent to up to 5 numbers set in "User mobile phone number settings" (mobile phone numbers with all 0s are invalid numbers);

[0203] C3) Intelligent power management terminal - the round 1 relay of the round and alarm output module is energized

[0204] operate;

[0205] C4) After a delay of 5 minutes, the intelligent power management terminal detects the current load (apparent power). If it still exceeds the set maximum load trip value, the round 2 relay will be energized.

[0206] C5) Until the current load (apparent power) is detected again to be less than the set maximum load trip value, the power consumption intelligent management terminal will close the record of the load overload trip abnormal event and release the opening control of the power load switch 1 and 2 opening control unit through the round 1 and 2 relays. Otherwise, the power consumption intelligent management terminal will maintain the current round port control state.

[0207] 6. Data query function

[0208] 6.1、Electric meter data query:

[0209] 6.1.1 Electric parameter query, can display: 192 items including three-phase voltage, current, active / reactive power, power factor and active / reactive total power, total power factor data and meter reading time (from near to far);

[0210] 6.1.2 Electric energy indication query

[0211] Recently, it can display 192 latest electric energy indications (including total forward and reverse active power, total forward and reverse reactive power, and maximum forward and reverse active power demand);

[0212] Every hour in the past two days, 48 ​​latest hourly readings of electric energy can be displayed (including total forward and reverse active power, total forward and reverse reactive power, and maximum forward and reverse active power demand);

[0213] Every day in the past month, 31 latest electric energy readings of the first reading of each day can be displayed (including total forward and reverse active power, total forward and reverse reactive power, and maximum forward and reverse active power demand);

[0214] Meter reading date in the past year, can display the first reading of 12 latest monthly meter reading days (including total forward and reverse active power, total forward and reverse reactive power, and maximum forward and reverse active power demand);

[0215] 6.2. Power factor query for this calculation period

[0216] Display 31 latest power factor values ​​per daily calculation cycle;

[0217] 6.3 Abnormal records:

[0218] Real-time power factor anomaly: record the occurrence and end time, and read the smart meter data when it first occurs;

[0219] Power factor abnormality in this electricity billing cycle: record the occurrence and end time, and read the smart meter data when it occurs for the first time;

[0220] Load over-limit alarm 1 abnormality: record the occurrence and end time, and read the smart meter data when it occurs for the first time;

[0221] Load over-limit alarm 2 abnormality: record the occurrence and end time, and read the smart meter data when it occurs for the first time;

[0222] Load overload pre-trip alarm exception: record the occurrence and end time, and read the smart meter data when it occurs for the first time;

[0223] Load overload tripping exception: record the occurrence and end time, and read the smart meter data when it occurs for the first time.

[0224] 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 terminal device for managing power factor and load of dedicated transformer users, characterized by: It includes an intelligent power management terminal, which is connected to a smart meter, a power load switch opening control unit and a power load switch opening indication alarm unit. The smart meter is used for electricity fee calculation. The smart power management terminal is connected to the smart meter using an RS485 communication port. The smart power management terminal reads various electrical parameters of the smart meter at regular intervals and provides abnormal SMS alarms for real-time power factor and abnormal low power factor in the current electricity fee calculation cycle; The intelligent power management terminal includes a round relay, which uses a passive contact action to realize the opening control operation of the power load switch opening control unit; The power consumption intelligent management terminal includes an alarm relay, and the alarm relay uses a passive normally open contact closing action to implement a disconnection indication alarm control operation on the power load switch disconnection indication alarm unit; The power consumption intelligent management terminal adopts an ARM core processing module, the processor of the ARM core processing module is AT91SAM9260, and the ARM core processing module is connected to a display screen, a button, an indicator light and at least 4 serial port peripherals; It also includes a debugging port and an external clock. The debugging port is connected to the ARM core processing module using an RJ45 network port to realize the program reading and writing debugging function. The external clock is connected to the ARM core processing module using an RJ45 network port to realize the program reading and writing debugging function. 2 The C interface is connected to the ARM core processing module to provide a clock reference for the system.

2. According to claim 1, a terminal device for managing power factor and load of dedicated transformer users is characterized in that: The display screen is an LCD dot matrix display screen, which is used to display information of the power consumption intelligent management terminal; The button is used for information entry and function operation of the smart electricity management terminal; The indicator light is an LED indicator light, which is used to indicate the working status of the power consumption intelligent management terminal; The number of the serial ports is four, and the four serial ports include: Serial port UART0 is connected with SMS communication module to realize SMS sending and receiving function; Serial port UART1, used for local maintenance; Serial port UART2 is used to communicate with the smart meter RS485 and read the smart meter electrical parameters; The serial port DEBUG is connected to a round and alarm output module, which includes a single-chip microcomputer, two groups of round relays and a group of alarm relays. The single-chip microcomputer communicates with the ARM core processing module, receives instructions, and controls the actions of the two groups of round relays and a group of alarm relays. The passive normally open / normally closed contacts of the round relays are connected to the power load switch opening control unit to realize the opening operation, and the passive normally open contacts of the alarm output relay are connected to the power load switch opening indication alarm unit to realize the opening indication alarm input or exit operation.

3. The terminal device for managing power factor and load of dedicated transformer users according to claim 2 is characterized in that: The number of connected power load switch disconnect control units is no more than two groups.

4. A method for managing the power factor of a dedicated transformer user, characterized in that: The method uses a terminal device for managing power factor and load of a dedicated transformer user as described in any one of claims 1 to 3, wherein the power consumption intelligent management terminal periodically reads the real-time data of the three-phase current and total power factor of the smart meter, calculates and analyzes the real-time power factor and compares it with the power factor alarm value; The power consumption intelligent management terminal in the terminal device reads the total active power indication and the total reactive power indication data of the smart meter, calculates and analyzes the power factor of the current electricity fee calculation period and compares it with the power factor assessment value; When the real-time power factor is lower than the real-time power factor alarm value and the power factor of the current electricity fee calculation period is lower than the power factor assessment value, the electricity intelligent management terminal sends a corresponding alarm text message to the set mobile phone number of the electricity management personnel.

5. A method for managing power factor of dedicated transformer users according to claim 4, characterized in that: When the smart electricity management terminal periodically reads the real-time data of the three-phase current and total power factor of the smart meter, if the absolute value of any phase current is ≥ the set value and the absolute value of the total power factor read this time is < the power factor alarm value, a real-time power factor abnormal event record is generated and a real-time power factor alarm SMS is sent to the set mobile phone number of the electricity management personnel; The power consumption intelligent management terminal regularly reads the total active power value and total reactive power value of the smart meter, and the power consumption intelligent management terminal has valid data records of the total active power value and total reactive power value on the meter reading and accounting day in the most recent month, and calculates the power factor value of this electricity fee accounting period according to the formula: in: ——Power factor value of this electricity fee calculation period; W 有n ——It is the latest total active energy indication of the electric meter; W 有0 ——The total active energy indication of the meter for calculating the daily energy recorded by the intelligent electricity management terminal in the latest month; W 无n ——It is the latest total reactive energy indication of the electric meter; W 无0 ——The total reactive energy indication of the meter reading and calculation day meter recorded by the power consumption intelligent management terminal in the latest month; When the power factor value of this electricity bill calculation period When the power factor exceeds the set assessment value, a record of abnormal power factor event for the electricity billing period is generated, and a power factor alarm SMS for the electricity billing period is sent to the set mobile phone number of the electricity usage management personnel.

6. A method for managing user load of a dedicated transformer, characterized in that: The method uses a terminal device for managing power factor and load of a dedicated transformer user as described in any one of claims 1 to 3, wherein the power consumption intelligent management terminal periodically reads the three-phase voltage and current real-time data of the smart meter, calculates and analyzes the current load and compares it with the rated load two-level alarm value and the maximum load trip value respectively; When the current load is greater than the two-level alarm value of the rated load and the current load is greater than the maximum load trip value, the power consumption intelligent management terminal sends a text message to the set mobile phone number of the power consumption management personnel.

7. A method for managing user load of a dedicated variable according to claim 6, characterized in that: The smart electricity management terminal periodically reads the real-time data of the three-phase voltage and current of the smart meter and calculates the current electricity load. The current electricity load, that is, the apparent power of the primary circuit, is calculated using the following formula: When the metering transformer is in the three-phase four-wire three-element metering mode, the following calculation formula is used for calculation: S=(|UA|*|IA|+|UB|*|IB|+|UC|*|IC|)*B PT *B CT / 1000 When the metering transformer is in the three-phase three-wire two-element metering mode, the following calculation formula is used: S=(|UA|*|IA|+|UC|*|IC|) / 2*√3*B PT *B CT / 1000 in: Metering transformer metering mode - for input items, three-phase four-wire three-element or three-phase three-wire two-element; S——is the apparent power of the primary circuit, in KVA, KVA=KW; UA, IA, UB, IB, UC, IC——refers to the three-phase voltage and current sampling values ​​of the electric meter read by the electric power intelligent management terminal this time; the voltage unit is V, and the current unit is A; B PT ——It is the voltage ratio, which refers to the voltage ratio of the measuring transformer, voltage ratio B PT = primary rated line voltage / secondary rated line voltage, primary rated line voltage and secondary rated line voltage are input items; B CT —— is the current ratio, which refers to the current ratio of the measuring transformer, the current ratio B CT = primary rated current / secondary rated current, primary rated current and secondary rated current are input items; When the primary circuit apparent power ≥ user rated load * load overlimit alarm coefficient 1, a load overlimit alarm 1 abnormal event record is generated, and a load overlimit alarm 1 alarm SMS is sent to the set mobile phone number of the electricity management personnel; When the primary circuit apparent power ≥ user rated load * load overlimit alarm coefficient 2, a load overlimit alarm 2 abnormal event record is generated, and a load overlimit alarm 2 alarm SMS is sent to the set mobile phone number of the electricity management personnel; When the primary circuit apparent power ≥ the maximum load trip value, the maximum load trip value is the user's rated load * load over-limit trip coefficient, and a load over-limit pre-trip alarm abnormal event record is generated, and a load over-limit pre-trip alarm SMS is sent to the set mobile phone number of the power management personnel. At the same time, the alarm relay is energized to control the connected power load switch opening indication alarm unit to realize the opening indication alarm function; And start the load overlimit tripping delay judgment. When the set delay time is reached, the power consumption intelligent management terminal detects the current load again. If it still exceeds the set maximum load tripping value, a load overlimit tripping abnormal event record is generated, and a load overlimit tripping alarm SMS is sent to the set mobile phone number of the power consumption management personnel. At the same time, the round 1 relay of the power consumption intelligent management terminal is energized to realize the opening operation of the load switch corresponding to round 1; after a delay of 5 minutes, the power consumption intelligent management terminal detects the current load again. If it still exceeds the set maximum load tripping value, the round 2 relay is energized to realize the opening operation of the load switch corresponding to round 2, until the current load is detected again to be less than the set maximum load tripping value, the power consumption intelligent management terminal will close the load overlimit tripping abnormal event record and release the opening control of the power load switch 1 and 2 opening control units through the round 1 and 2 relays. Otherwise, the power consumption intelligent management terminal will maintain the current round port control state.

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