CA3130969C - Intelligent current transformer - Google Patents
Intelligent current transformer Download PDFInfo
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- CA3130969C CA3130969C CA3130969A CA3130969A CA3130969C CA 3130969 C CA3130969 C CA 3130969C CA 3130969 A CA3130969 A CA 3130969A CA 3130969 A CA3130969 A CA 3130969A CA 3130969 C CA3130969 C CA 3130969C
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
- G01R11/24—Arrangements for avoiding or indicating fraudulent use
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/146—Measuring arrangements for current not covered by other subgroups of G01R15/14, e.g. using current dividers, shunts, or measuring a voltage drop
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
- G01R22/066—Arrangements for avoiding or indicating fraudulent use
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transformers For Measuring Instruments (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
Disclosed is an intelligent current transformer. The intelligent current transformer includes a transformer housing structure, a secondary wiring terminal, a 485 bus wiring terminal, a mounting base plate, a terminal cover, a circuit board, a main magnetic core coil, and an auxiliary magnetic core coil. The main magnetic core coil, the auxiliary magnetic core coil and the circuit board are mounted inside the transformer housing structure and are potted with epoxy. The secondary wiring terminal and the 485 bus wiring terminal are secured on the transformer housing structure by hot melting. The circuit board is connected to the 485 bus wiring terminal and an outlet line of the auxiliary magnetic core coil, and an outlet line of the main magnetic core coil is connected to the secondary wiring terminal.
Description
INTELLIGENT CURRENT TRANSFORMER
l'ECHNICAL FIELD
100011 The present invention relates to the technical field of power devices and, in particular, to an intelligent current transformer.
BACKGROUND
l'ECHNICAL FIELD
100011 The present invention relates to the technical field of power devices and, in particular, to an intelligent current transformer.
BACKGROUND
[0002] In the power industry, if a power system of a certain voltage level and a certain scale is to be developed, transformers of corresponding voltage level and corresponding accuracy must be developed to satisfy the needs of measurement, protection and control of the power system.
On the one hand, the power industry in China is developing at a high speed with rapid economic growth. Various energy sources such as fire, water, wind, light and nuclear are blooming like flowers. Current transformers are an important part of power transmission and transfoimation devices, and the consumption of current transformers is increasing at an annual rate of 8%. On the other hand, current transfoiniers are widely used in all walks of life, such as mining, metallurgy, rail transportation, port logistics, etc. Industry differences leads to the complexity of the mounting environment. The number of mounted devices is increasing day by day, and the difficulty of condition monitoring and overhaul of the devices is also increasing linearly. At present, with increasingly mature and perfect carrier technologies and radio technologies, the information of electric energy meters, concentrators and other devices can be uploaded to a master station system. However, current transformers, an important part of an acquisition system, have not been able to be monitored and managed.
100031 According to the development plan of State Grid, the acquisition system of power consumption information of China's smart grid needs to achieve full coverage of all power consumption sites, use advanced metering devices to acquire and process users' electric energy status information in real time, and accurately and timely transmit the information to other related power application systems to assist power enterprises to complete various management and operation decisions. If "full coverage and full acquisition" of power users within the system of State Grid Corporation of China is achieved, the situation that it has been unable to control the information of power users timely, completely and accurately for a long time will be effectively changed, urgent requirements of all levels and specialties of the system of State Grid Corporation for the power consumption information of power users are satisfied, and the corporation is significantly promoted to achieve a historic leap in modem management. The acquisition of Date Recue/Date Received 2023-03-16 information of current transformers is also an important part.
[0004] Current transformers are also widely used in other industries not directly related to State Grid Corporation of China. Under the condition of the complex environment and many uncertain factors, intelligent transformers capable of reporting power condition information can bring great convenience to users. Of course, mounting an intelligent acquisition terminal near a current transformer to acquire the status information of the current transformer can also achieve real-time monitoring on the transformer device. However, if the intelligent device is mounted, not only will the cost increase, but the wiring and power supply scheme of the device will become more complicated. In the use environment of mines and rail transportation, problems such as easy aging of lines and limited operating space may exist. Complicated wiring manners not only reduce the reliability of the device and increase the difficulty of mounting, but also may bring unknown safety risks. Therefore, the integrated design of a current transformer and an intelligent terminal is of great significance.
[0005] Acquiring the device information of current transformers to achieve unified management is an important issue to be solved urgently. Achieving remote monitoring and management on mounted devices can avoid consuming a lot of manpower and material resources.
The acquired device information of a current transformer includes not only a device model and a current magnitude, but also the status information of the transformer, such as measurement errors caused by temperature changes of coils or magnetic cores inside the current transformer, which .. requires long-term data recording and comparison. At present, this aspect remains virgin territory for current transformers. In addition, the lack of monitoring the output value of the current transformer gives an opportunity to electricity stealing. The diversification of electricity stealing behaviors makes it impossible for anti-electricity stealing measures to be comprehensive.
SUMMARY
[0006] In order to overcome shortcomings or deficiencies of current transformers in the related art, the present invention provides an intelligent current transformer, which integrates a traditional transformer and an intelligent acquisition terminal to open up a data channel between the current transformer and a master station system and acquire the device information of the current transformer. According to the intelligent current transformer, unified management is achieved, and the function of checking electricity stealing is also achieved at the same time. The internal temperature of the current transformer can be monitored in real time, and the purpose of energy reduction and emission reduction can be achieved through a low-power consumption and self-Date Recue/Date Received 2023-03-16 power-supply design.
[0007] To solve the above problems, the present invention adopts solutions described below.
[0008] An intelligent current transformer is provided and includes a transformer housing structure, a main magnetic core coil, an auxiliary magnetic core coil, a circuit board, a secondary wiring terminal, a Recommended Standard (RS)-485 bus wiring terminal, a terminal cover, and a mounting base plate, where the main magnetic core coil, the auxiliary magnetic core coil and the circuit board are mounted inside the transformer housing structure, the secondary wiring terminal and the RS-485 bus wiring terminal are secured on the transformer housing structure by hot melting, the terminal cover is secured on the transformer housing structure by a screw, and the mounting base plate is connected to the transformer housing structure.
[0009] The main magnetic core coil is potted with epoxy, an outlet line of the main magnetic core coil is connected to the secondary wiring terminal, and the secondary wiring terminal is at the same time connected to an external electric meter through a metering bus to achieve current measurement.
100101 The auxiliary magnetic core coil is potted with epoxy, an outlet line of the auxiliary magnetic core coil is connected to the circuit board, and the auxiliary magnetic core coil supplies power to the circuit board according to principles of electromagnetic induction and at the same time acquires a primary current value signal and sends the primary current value signal to the circuit board.
100111 The circuit board is potted with epoxy, is connected to the RS-485 bus wiring terminal and receives the primary current value signal sent by the auxiliary magnetic core coil.
[0012] While the RS-485 bus wiring terminal is connected to the circuit board, a connection between the external electric meter and a specialty transformer terminal is achieved, and t the primary current value signal received by the circuit board is sent to the specialty transformer terminal.
[0013] The terminal cover ensures that the secondary wiring terminal and the RS-485 bus wiring terminal are not freely touched without damaging the terminal cover.
[0014] The mounting base plate is a cold-rolled steel sheet, and is configured to mount and
On the one hand, the power industry in China is developing at a high speed with rapid economic growth. Various energy sources such as fire, water, wind, light and nuclear are blooming like flowers. Current transformers are an important part of power transmission and transfoimation devices, and the consumption of current transformers is increasing at an annual rate of 8%. On the other hand, current transfoiniers are widely used in all walks of life, such as mining, metallurgy, rail transportation, port logistics, etc. Industry differences leads to the complexity of the mounting environment. The number of mounted devices is increasing day by day, and the difficulty of condition monitoring and overhaul of the devices is also increasing linearly. At present, with increasingly mature and perfect carrier technologies and radio technologies, the information of electric energy meters, concentrators and other devices can be uploaded to a master station system. However, current transformers, an important part of an acquisition system, have not been able to be monitored and managed.
100031 According to the development plan of State Grid, the acquisition system of power consumption information of China's smart grid needs to achieve full coverage of all power consumption sites, use advanced metering devices to acquire and process users' electric energy status information in real time, and accurately and timely transmit the information to other related power application systems to assist power enterprises to complete various management and operation decisions. If "full coverage and full acquisition" of power users within the system of State Grid Corporation of China is achieved, the situation that it has been unable to control the information of power users timely, completely and accurately for a long time will be effectively changed, urgent requirements of all levels and specialties of the system of State Grid Corporation for the power consumption information of power users are satisfied, and the corporation is significantly promoted to achieve a historic leap in modem management. The acquisition of Date Recue/Date Received 2023-03-16 information of current transformers is also an important part.
[0004] Current transformers are also widely used in other industries not directly related to State Grid Corporation of China. Under the condition of the complex environment and many uncertain factors, intelligent transformers capable of reporting power condition information can bring great convenience to users. Of course, mounting an intelligent acquisition terminal near a current transformer to acquire the status information of the current transformer can also achieve real-time monitoring on the transformer device. However, if the intelligent device is mounted, not only will the cost increase, but the wiring and power supply scheme of the device will become more complicated. In the use environment of mines and rail transportation, problems such as easy aging of lines and limited operating space may exist. Complicated wiring manners not only reduce the reliability of the device and increase the difficulty of mounting, but also may bring unknown safety risks. Therefore, the integrated design of a current transformer and an intelligent terminal is of great significance.
[0005] Acquiring the device information of current transformers to achieve unified management is an important issue to be solved urgently. Achieving remote monitoring and management on mounted devices can avoid consuming a lot of manpower and material resources.
The acquired device information of a current transformer includes not only a device model and a current magnitude, but also the status information of the transformer, such as measurement errors caused by temperature changes of coils or magnetic cores inside the current transformer, which .. requires long-term data recording and comparison. At present, this aspect remains virgin territory for current transformers. In addition, the lack of monitoring the output value of the current transformer gives an opportunity to electricity stealing. The diversification of electricity stealing behaviors makes it impossible for anti-electricity stealing measures to be comprehensive.
SUMMARY
[0006] In order to overcome shortcomings or deficiencies of current transformers in the related art, the present invention provides an intelligent current transformer, which integrates a traditional transformer and an intelligent acquisition terminal to open up a data channel between the current transformer and a master station system and acquire the device information of the current transformer. According to the intelligent current transformer, unified management is achieved, and the function of checking electricity stealing is also achieved at the same time. The internal temperature of the current transformer can be monitored in real time, and the purpose of energy reduction and emission reduction can be achieved through a low-power consumption and self-Date Recue/Date Received 2023-03-16 power-supply design.
[0007] To solve the above problems, the present invention adopts solutions described below.
[0008] An intelligent current transformer is provided and includes a transformer housing structure, a main magnetic core coil, an auxiliary magnetic core coil, a circuit board, a secondary wiring terminal, a Recommended Standard (RS)-485 bus wiring terminal, a terminal cover, and a mounting base plate, where the main magnetic core coil, the auxiliary magnetic core coil and the circuit board are mounted inside the transformer housing structure, the secondary wiring terminal and the RS-485 bus wiring terminal are secured on the transformer housing structure by hot melting, the terminal cover is secured on the transformer housing structure by a screw, and the mounting base plate is connected to the transformer housing structure.
[0009] The main magnetic core coil is potted with epoxy, an outlet line of the main magnetic core coil is connected to the secondary wiring terminal, and the secondary wiring terminal is at the same time connected to an external electric meter through a metering bus to achieve current measurement.
100101 The auxiliary magnetic core coil is potted with epoxy, an outlet line of the auxiliary magnetic core coil is connected to the circuit board, and the auxiliary magnetic core coil supplies power to the circuit board according to principles of electromagnetic induction and at the same time acquires a primary current value signal and sends the primary current value signal to the circuit board.
100111 The circuit board is potted with epoxy, is connected to the RS-485 bus wiring terminal and receives the primary current value signal sent by the auxiliary magnetic core coil.
[0012] While the RS-485 bus wiring terminal is connected to the circuit board, a connection between the external electric meter and a specialty transformer terminal is achieved, and t the primary current value signal received by the circuit board is sent to the specialty transformer terminal.
[0013] The terminal cover ensures that the secondary wiring terminal and the RS-485 bus wiring terminal are not freely touched without damaging the terminal cover.
[0014] The mounting base plate is a cold-rolled steel sheet, and is configured to mount and
3 Date Rectie/Date Received 2023-03-16 secure the current transformer.
[0015] Further, the circuit board has a RS-485 interface and a current sampling port which are respectively connected to the RS-485 bus wiring terminal and the outlet line of the auxiliary magnetic core coil for RS-485 communication and the current measurement, and a measured current value is allowed to be uploaded to the specialty transformer teiminal externally connected to the intelligent current transformer through a RS-485 bus.
[0016] Further, the circuit board has a temperature detection sensor capable of monitoring an internal temperature of the intelligent current transformer in real time, so that a function of monitoring a changing trend of an accuracy of the intelligent current transfoiiiier with a temperature is achieved.
[0017] Further, the circuit board has a super capacitor capable of storing energy through the auxiliary magnetic core coil to ensure a normal operation of the circuit board.
[0018] Further, two current measurement values respectively acquired by the main magnetic core coil and the auxiliary magnetic core coil are compared, if the two current measurement values are equal, it is determined that no electricity stealing behavior exists, and if the two current measurement values are not equal, it is determined that electricity stealing behavior exists.
[0019] The present invention has beneficial effects described below.
[0020] 1. Device information of a transformer is acquired through a master station system, so that unified management is achieved.
[0021] 2. Through real-time monitoring on an output value of the current transformer, electricity stealing behavior is effectively prevented.
[0022] 3. An internal temperature of the current transformer is monitored in real time, so that a function of monitoring a changing trend of an accuracy of the intelligent current transformer with a temperature is achieved.
[0023] 4. The purpose of energy reduction and emission reduction is achieved through a low-power consumption and self-power-supply design.
[0015] Further, the circuit board has a RS-485 interface and a current sampling port which are respectively connected to the RS-485 bus wiring terminal and the outlet line of the auxiliary magnetic core coil for RS-485 communication and the current measurement, and a measured current value is allowed to be uploaded to the specialty transformer teiminal externally connected to the intelligent current transformer through a RS-485 bus.
[0016] Further, the circuit board has a temperature detection sensor capable of monitoring an internal temperature of the intelligent current transformer in real time, so that a function of monitoring a changing trend of an accuracy of the intelligent current transfoiiiier with a temperature is achieved.
[0017] Further, the circuit board has a super capacitor capable of storing energy through the auxiliary magnetic core coil to ensure a normal operation of the circuit board.
[0018] Further, two current measurement values respectively acquired by the main magnetic core coil and the auxiliary magnetic core coil are compared, if the two current measurement values are equal, it is determined that no electricity stealing behavior exists, and if the two current measurement values are not equal, it is determined that electricity stealing behavior exists.
[0019] The present invention has beneficial effects described below.
[0020] 1. Device information of a transformer is acquired through a master station system, so that unified management is achieved.
[0021] 2. Through real-time monitoring on an output value of the current transformer, electricity stealing behavior is effectively prevented.
[0022] 3. An internal temperature of the current transformer is monitored in real time, so that a function of monitoring a changing trend of an accuracy of the intelligent current transformer with a temperature is achieved.
[0023] 4. The purpose of energy reduction and emission reduction is achieved through a low-power consumption and self-power-supply design.
4 Date Recut/Date Received 2023-03-16 BRIEF DESCRIPTION OF DRAWINGS
[0024] FIG. 1 is an external view of an intelligent current transformer according to the present invention;
[0025] FIG. 2 is a longitudinal sectional view of an intelligent current transformer according to the present invention;
[0026] FIG. 3 is a top view of an intelligent current transfointer according to the present invention; and [0027] FIG. 4 is a block diagram of a working intelligent current transformer according to the present invention.
[0028] Reference list 1 transformer housing structure 2 secondary wiring terminal 3 RS-485 bus wiring terminal 4 mounting base plate
[0024] FIG. 1 is an external view of an intelligent current transformer according to the present invention;
[0025] FIG. 2 is a longitudinal sectional view of an intelligent current transformer according to the present invention;
[0026] FIG. 3 is a top view of an intelligent current transfointer according to the present invention; and [0027] FIG. 4 is a block diagram of a working intelligent current transformer according to the present invention.
[0028] Reference list 1 transformer housing structure 2 secondary wiring terminal 3 RS-485 bus wiring terminal 4 mounting base plate
5 terminal cover
6 circuit board
7 main magnetic core coil
8 auxiliary magnetic core coil
9 electric meter
10 specialty transformer tetntinal
11 RS-485 bus
12 metering bus DETAILED DESCRIPTION
[0029] The present invention is described below in detail in conjunction with drawings and embodiments.
[0030] As shown in FIG. 1, FIG. 2 and FIG. 3, an intelligent current transformer includes a transformer housing structure 1, a secondary wiring terminal 2, a RS-485 bus wiring terminal 3, a mounting base plate 4, a terminal cover 5, a circuit board 6, a main magnetic core coil 7, and an Date Recue/Date Received 2023-03-16 auxiliary magnetic core coil 8. The main magnetic core coil 7, the auxiliary magnetic core coil 8 and the circuit board 6 are mounted inside the transformer housing structure and are potted with epoxy. The secondary wiring terminal 2 and the RS-485 bus wiring terminal 3 are secured on the transformer housing structure 1 by hot melting, the terminal cover 5 is secured on the transformer housing structure 1 by a screw, and the mounting base plate 4 is connected to the transformer housing structure 1.
[0031] An outlet line of the main magnetic core coil 7 is connected to the secondary wiring terminal 2, and the secondary wiring terminal 2 is at the same time connected to an external electric meter through a metering bus 12 to achieve current measurement [0032] An outlet line of the auxiliary magnetic core coil 8 is connected to the circuit board 6, and the auxiliary magnetic core coil 8 supplies power to the circuit board according to principles of electromagnetic induction and at the same time acquires a primary current value and sends the primary current value signal to the circuit board.
[0033] The circuit board 6 is connected to the RS-485 bus wiring temtinal 3 and at the same time receives primary current value signal sent by the auxiliary magnetic core coil 8.
[0034] While the RS-485 bus wiring terminal 3 is connected to the circuit board 6, a connection between the external electric meter and a specialty transformer terminal is achieved, and the RS-485 bus wiring terminal 3 at the same time sends a primary current value signal received by the circuit board 6 to the specialty transformer teiminal.
[0035] The terminal cover 5 ensures that the secondary wiring terminal 2 and the RS-485 bus wiring teiminal 3 are not freely touched in the case where the terminal cover 5 is not damaged.
[0036] A material of the mounting base plate 4 is a cold-rolled steel sheet, and the mounting base plate 4 is used to mount and secure the current transfoliner.
[0037] Further, the circuit board 6 has a RS-485 interface and a current sampling port which are respectively connected to the RS-485 bus wiring terminal 3 and the outlet line of the auxiliary magnetic core coil 8 for RS-485 communication and the current measurement, and a measured current value is uploaded to a specialty transformer terminal 10 through a RS-485 bus.
[0038] Further, the circuit board 6 has a temperature detection sensor capable of monitoring an Date Recue/Date Received 2023-03-16 internal temperature of the intelligent current transformer in real time, so that a function of monitoring a changing trend of an accuracy of the intelligent current transformer with a temperature is achieved.
[0039] Further, the circuit board 6 has a super capacitor capable of storing energy through the auxiliary magnetic core coil 8 to ensure a normal operation of the circuit board.
[0040] In an actual mounting and use process, busbars pass through the intelligent current transformer, and the intelligent transformer is secured in a distribution box through the mounting base plate 4. As shown in FIG. 4, the circuit board 6 has a temperature detection sensor capable of monitoring an internal temperature of the intelligent current transformer in real time. The main magnetic core coil 7 may measure a busbar current, and the external electric meter 9 is connected to the secondary wiring terminal 2 and acquires a measured busbar current value through the metering bus 12. The electric meter 9 is connected to the specialty transformer terminal 10 through the RS-485 bus 11, and the measured busbar current value and temperature information may be uploaded to the master station system by the specialty transformer terminal 10. In this way, the intelligent current transformer can be remotely monitored and managed, so that the blind spot of monitoring the transformer in the acquisition system is eliminated.
The auxiliary magnetic core coil 8 adopts an amorphous magnetic core of lOmm x 5mm, with a winding turn of 1200, and the auxiliary magnetic core coil 8 can measure a bus current simultaneously with the main magnetic core coil 7. The outlet line of the auxiliary magnetic core coil 8 is connected to the current sampling port of the circuit board 6, which, on the one hand, can supply power to the circuit board, and on the other hand, can achieve bus current acquisition. The RS-485 interface of the circuit board 6 is connected to the RS-485 bus wiring terminal 3, and the current value acquired by the auxiliary magnetic core coil 8 is transmitted to the specialty transformer terminal 10 through the RS-485 bus, and then is uploaded to the master station system.
In this way, the specialty transformer terminal 10 receives both the current measurement value from the main magnetic core coil 7 and the current measurement value from the auxiliary magnetic core coil 8.
The two measurement values are compared, if the two measurement values are equal, no electricity stealing behavior exists, and if the two measurement values are not equal, electricity stealing behavior exists. Common electricity stealing methods will cause a change of the current measurement value of the main magnetic core coil 7, and the changed current measurement value is not equal to the current measurement value of the auxiliary magnetic core coil 8, so that whether electricity stealing behavior exists is determined.
Date Recut/Date Received 2023-03-16 [0041] The above are merely embodiments of the present invention and not intended to limit the scope of the present invention. Any equivalent structural variations or equivalent process variations made on the basis of the specification and the drawings of the present invention, or direct or indirect utilization in other relevant fields all fall within the scope of the present invention.
Date Recut/Date Received 2023-03-16
[0029] The present invention is described below in detail in conjunction with drawings and embodiments.
[0030] As shown in FIG. 1, FIG. 2 and FIG. 3, an intelligent current transformer includes a transformer housing structure 1, a secondary wiring terminal 2, a RS-485 bus wiring terminal 3, a mounting base plate 4, a terminal cover 5, a circuit board 6, a main magnetic core coil 7, and an Date Recue/Date Received 2023-03-16 auxiliary magnetic core coil 8. The main magnetic core coil 7, the auxiliary magnetic core coil 8 and the circuit board 6 are mounted inside the transformer housing structure and are potted with epoxy. The secondary wiring terminal 2 and the RS-485 bus wiring terminal 3 are secured on the transformer housing structure 1 by hot melting, the terminal cover 5 is secured on the transformer housing structure 1 by a screw, and the mounting base plate 4 is connected to the transformer housing structure 1.
[0031] An outlet line of the main magnetic core coil 7 is connected to the secondary wiring terminal 2, and the secondary wiring terminal 2 is at the same time connected to an external electric meter through a metering bus 12 to achieve current measurement [0032] An outlet line of the auxiliary magnetic core coil 8 is connected to the circuit board 6, and the auxiliary magnetic core coil 8 supplies power to the circuit board according to principles of electromagnetic induction and at the same time acquires a primary current value and sends the primary current value signal to the circuit board.
[0033] The circuit board 6 is connected to the RS-485 bus wiring temtinal 3 and at the same time receives primary current value signal sent by the auxiliary magnetic core coil 8.
[0034] While the RS-485 bus wiring terminal 3 is connected to the circuit board 6, a connection between the external electric meter and a specialty transformer terminal is achieved, and the RS-485 bus wiring terminal 3 at the same time sends a primary current value signal received by the circuit board 6 to the specialty transformer teiminal.
[0035] The terminal cover 5 ensures that the secondary wiring terminal 2 and the RS-485 bus wiring teiminal 3 are not freely touched in the case where the terminal cover 5 is not damaged.
[0036] A material of the mounting base plate 4 is a cold-rolled steel sheet, and the mounting base plate 4 is used to mount and secure the current transfoliner.
[0037] Further, the circuit board 6 has a RS-485 interface and a current sampling port which are respectively connected to the RS-485 bus wiring terminal 3 and the outlet line of the auxiliary magnetic core coil 8 for RS-485 communication and the current measurement, and a measured current value is uploaded to a specialty transformer terminal 10 through a RS-485 bus.
[0038] Further, the circuit board 6 has a temperature detection sensor capable of monitoring an Date Recue/Date Received 2023-03-16 internal temperature of the intelligent current transformer in real time, so that a function of monitoring a changing trend of an accuracy of the intelligent current transformer with a temperature is achieved.
[0039] Further, the circuit board 6 has a super capacitor capable of storing energy through the auxiliary magnetic core coil 8 to ensure a normal operation of the circuit board.
[0040] In an actual mounting and use process, busbars pass through the intelligent current transformer, and the intelligent transformer is secured in a distribution box through the mounting base plate 4. As shown in FIG. 4, the circuit board 6 has a temperature detection sensor capable of monitoring an internal temperature of the intelligent current transformer in real time. The main magnetic core coil 7 may measure a busbar current, and the external electric meter 9 is connected to the secondary wiring terminal 2 and acquires a measured busbar current value through the metering bus 12. The electric meter 9 is connected to the specialty transformer terminal 10 through the RS-485 bus 11, and the measured busbar current value and temperature information may be uploaded to the master station system by the specialty transformer terminal 10. In this way, the intelligent current transformer can be remotely monitored and managed, so that the blind spot of monitoring the transformer in the acquisition system is eliminated.
The auxiliary magnetic core coil 8 adopts an amorphous magnetic core of lOmm x 5mm, with a winding turn of 1200, and the auxiliary magnetic core coil 8 can measure a bus current simultaneously with the main magnetic core coil 7. The outlet line of the auxiliary magnetic core coil 8 is connected to the current sampling port of the circuit board 6, which, on the one hand, can supply power to the circuit board, and on the other hand, can achieve bus current acquisition. The RS-485 interface of the circuit board 6 is connected to the RS-485 bus wiring terminal 3, and the current value acquired by the auxiliary magnetic core coil 8 is transmitted to the specialty transformer terminal 10 through the RS-485 bus, and then is uploaded to the master station system.
In this way, the specialty transformer terminal 10 receives both the current measurement value from the main magnetic core coil 7 and the current measurement value from the auxiliary magnetic core coil 8.
The two measurement values are compared, if the two measurement values are equal, no electricity stealing behavior exists, and if the two measurement values are not equal, electricity stealing behavior exists. Common electricity stealing methods will cause a change of the current measurement value of the main magnetic core coil 7, and the changed current measurement value is not equal to the current measurement value of the auxiliary magnetic core coil 8, so that whether electricity stealing behavior exists is determined.
Date Recut/Date Received 2023-03-16 [0041] The above are merely embodiments of the present invention and not intended to limit the scope of the present invention. Any equivalent structural variations or equivalent process variations made on the basis of the specification and the drawings of the present invention, or direct or indirect utilization in other relevant fields all fall within the scope of the present invention.
Date Recut/Date Received 2023-03-16
Claims (5)
1. An intelligent current transformer, comprising a transformer housing structure, a main magnetic core coil, an auxiliary magnetic core coil, a circuit board, a secondary wiring terminal, a Recommended Standard (RS)-485 bus wiring terminal, a terminal cover, and a mounting base plate, characterized in that the main magnetic core coil, the auxiliary magnetic core coil and the circuit board are mounted inside the transformer housing structure, the secondary wiring terminal and the RS-485 bus wiring terminal are secured on the transformer housing structure by hot melting, the terminal cover is secured on the transformer housing structure by a screw, and the mounting base plate is connected to the transformer housing structure, wherein, the main magnetic core coil is potted with epoxy, an outlet line of the main magnetic core coil is connected to the secondary wiring terminal, and a busbar current value is acquired through a metering bus connected to the secondary wiring terminal;
the auxiliary magnetic core coil is potted with epoxy, an outlet line of the auxiliary magnetic core coil is connected to the circuit board, and the auxiliary magnetic core coil powers the circuit board according to principles of electromagnetic induction and acquires a primary current value signal and sends the primary current value signal to the circuit board;
the circuit board is potted with epoxy, is connected to the RS-485 bus wiring terminal and receives the primary current value signal sent by the auxiliary magnetic core coil;
the secondary wiring terminal is connected to an external electric meter and the metering bus to achieve current measurement;
while the RS-485 bus wiring terminal is connected to the circuit board, a connection between the external electric meter and a specialty transformer terminal is achieved, and the primary current value signal received by the circuit board is sent to the specialty transformer terminal;
and the terminal cover ensures that the secondary wiring terminal and the RS-485 bus wiring terminal are not freely touched without damaging the terminal cover.
the auxiliary magnetic core coil is potted with epoxy, an outlet line of the auxiliary magnetic core coil is connected to the circuit board, and the auxiliary magnetic core coil powers the circuit board according to principles of electromagnetic induction and acquires a primary current value signal and sends the primary current value signal to the circuit board;
the circuit board is potted with epoxy, is connected to the RS-485 bus wiring terminal and receives the primary current value signal sent by the auxiliary magnetic core coil;
the secondary wiring terminal is connected to an external electric meter and the metering bus to achieve current measurement;
while the RS-485 bus wiring terminal is connected to the circuit board, a connection between the external electric meter and a specialty transformer terminal is achieved, and the primary current value signal received by the circuit board is sent to the specialty transformer terminal;
and the terminal cover ensures that the secondary wiring terminal and the RS-485 bus wiring terminal are not freely touched without damaging the terminal cover.
2. The intelligent current transformer according to claim 1, characterized in that the circuit board has a RS-485 interface and a current sampling port which are respectively connected to the RS-485 bus wiring terminal and the outlet line of the auxiliary magnetic core coil for RS-485 communication and the current measurement, and a measured current value is allowed to be uploaded to the specialty transformer terminal externally connected to the intelligent current transformer through a RS-485 bus.
3. The intelligent current transformer according to claim 1, characterized in that the circuit board has a temperature detection sensor capable of monitoring an internal temperature of the intelligent current transformer in real time, so that a function of monitoring a changing trend of an accuracy of the intelligent current transformer with a temperature is achieved.
4. The intelligent current transfoimer according to claim 1, characterized in that the circuit board has a super capacitor capable of storing energy through the auxiliary magnetic core coil to ensure a normal operation of the circuit board.
5. The intelligent current transformer according to claim 1, characterized in that two current measurement values respectively acquired by the main magnetic core coil and the auxiliary magnetic core coil are compared, if the two current measurement values are equal, it is determined that no electricity stealing behavior exists, and if the two current measurement values are not equal, it is determined that electricity stealing behavior exists.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011150936.4A CN112180138A (en) | 2020-10-24 | 2020-10-24 | Intelligent current transformer |
| CN202011150936.4 | 2020-10-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA3130969A1 CA3130969A1 (en) | 2022-04-24 |
| CA3130969C true CA3130969C (en) | 2023-10-24 |
Family
ID=73922647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA3130969A Active CA3130969C (en) | 2020-10-24 | 2021-09-16 | Intelligent current transformer |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN112180138A (en) |
| AT (1) | AT524408A2 (en) |
| CA (1) | CA3130969C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113295915A (en) * | 2021-07-27 | 2021-08-24 | 武汉中原电子信息有限公司 | Current calibration method and system for power grid collector and storage medium |
-
2020
- 2020-10-24 CN CN202011150936.4A patent/CN112180138A/en active Pending
-
2021
- 2021-09-16 CA CA3130969A patent/CA3130969C/en active Active
- 2021-10-20 AT ATA50836/2021A patent/AT524408A2/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AT524408A2 (en) | 2022-05-15 |
| CN112180138A (en) | 2021-01-05 |
| CA3130969A1 (en) | 2022-04-24 |
| AT524408A8 (en) | 2022-07-15 |
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