CN111261374A - Environment-friendly intelligent mutual inductor and mutual inductor compensation method - Google Patents
Environment-friendly intelligent mutual inductor and mutual inductor compensation method Download PDFInfo
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- CN111261374A CN111261374A CN202010222598.4A CN202010222598A CN111261374A CN 111261374 A CN111261374 A CN 111261374A CN 202010222598 A CN202010222598 A CN 202010222598A CN 111261374 A CN111261374 A CN 111261374A
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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
- H01F27/02—Casings
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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
- G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
- G01R15/185—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core with compensation or feedback windings or interacting coils, e.g. 0-flux sensors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
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Abstract
The invention belongs to the technical field of mutual inductors, and particularly relates to an environment-friendly intelligent mutual inductor and a mutual inductor compensation method, which comprise the following steps: the transformer comprises a mutual inductor, an outer shell and an inner shell; an insulating material is arranged between the outer shell and the inner shell; the mutual inductor is arranged in the inner shell; the mutual inductor includes: the transformer comprises a transformer body, a delay compensation device and a saturation calculation device; the time delay compensation device and the saturation calculation device are respectively in signal connection with the mutual inductor body; the time delay compensation device is used for carrying out time delay compensation on the mutual inductor; the saturation calculation device is used for calculating the saturation degree of the mutual inductor and controlling the mutual inductor to operate; the method has the advantages of environmental protection, energy conservation, easy use and installation, good mutual inductance performance and accurate time delay compensation.
Description
Technical Field
The invention belongs to the technical field of mutual inductors, and particularly relates to an environment-friendly intelligent mutual inductor and a mutual inductor compensation method.
Background
The mutual inductor is also called instrument transformer, and is a general name of current mutual inductor and voltage mutual inductor. The high voltage can be changed into low voltage, and the large current can be changed into small current for measuring or protecting the system. Its function is mainly to convert high voltage or large current into standard low voltage (100V) or standard small current (5A or 1A, both referring to rated value) in proportion so as to realize standardization and miniaturization of measuring instrument, protection equipment and automatic control equipment. Meanwhile, the mutual inductor can be used for isolating a high-voltage system so as to ensure the safety of people and equipment.
In order to transmit electric energy, an electric power system usually adopts an alternating voltage and large current loop to transmit the electric power to a user, and cannot use an instrument to directly measure the electric power. The mutual inductor has the functions of reducing alternating voltage and large current to values which can be directly measured by the instrument in proportion, facilitating the direct measurement of the instrument and simultaneously providing power for relay protection and automatic devices. The mutual inductor for power system is a special transformer for transmitting the information of high voltage and large current of power network to the metering and measuring instrument and relay protection of low voltage and small current secondary side and automatic equipment. The mutual inductor is matched with the measuring instrument and the metering device, and can measure the voltage, the current and the electric energy of a primary system; and the device can be matched with a relay protection device and an automatic device to form electric protection and automatic control on various faults of a power grid. The performance of the mutual inductor directly influences the accuracy of measurement and metering of the power system and the reliability of the action of the relay protection device.
Disclosure of Invention
In view of the above, the main object of the present invention is to provide an environment-friendly assembled plastic shell and a transformer, which have the advantages of environmental protection, energy saving, easy use and installation, good mutual inductance performance, and accurate delay compensation.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an environment-friendly intelligent transformer, comprising: the transformer comprises a mutual inductor, an outer shell and an inner shell; an insulating material is arranged between the outer shell and the inner shell; the mutual inductor is arranged in the inner shell; the mutual inductor includes: the transformer comprises a transformer body, a delay compensation device and a saturation calculation device; the time delay compensation device and the saturation calculation device are respectively in signal connection with the mutual inductor body; the time delay compensation device is used for carrying out time delay compensation on the mutual inductor; the saturation calculation device is used for calculating the saturation degree of the mutual inductor and controlling the mutual inductor to operate; the saturation calculation device and the method for calculating the saturation degree of the mutual inductor execute the following steps: the saturation calculation device acquires current sampling data of the mutual inductor, extracts a non-saturation interval in current according to the acquired sampling data, and records the non-saturation interval as G; calculating the upper limit value of the current sampling data according to the following formula:
wherein L ismaxIs an upper limit value, and N is the sampling frequency; constructing a middle matrix R according to the upper limit value obtained by calculation; decomposing the intermediate matrix R to obtain the characteristic parameter sigma of the intermediate matrixp(ii) a When the characteristic parameters of the intermediate matrix meet the following conditions:
the method comprises the following steps of calculating time delay through current sampling data, calculating a square value of the amplitude value of the current sampling data, calculating an imaginary part of the current sampling data, and performing rotation compensation on the current sampling data by using the calculated data to obtain compensated current sampling data, wherein the method for performing the rotation compensation on the current sampling data by using the calculated data comprises the following steps:
wherein, the x0And y0Is a coordinate value, x, of the original current sample datanAnd ynSampling data for the rotation compensated current, thetaiA phase value corresponding to the current sampling data; snSetting the rotation matrix parameter sequence as an amplitude value corresponding to the current sampling data; n is the number of current sampling data, thetaiIs a delay angle; the above-mentioned
Wherein L isiIs the theory of mutual inductorFrequency value, Li' is the real-time frequency value at the time of sampling.
Further, the intermediate matrix R is represented as:
where the r' bit calculates the absolute value of the difference between the two numbers.
Further, the outer shell is made of a metal material; the outer housing includes: a left half and a right half; the left half part and the right half part are completely clamped to form a closed space; the left half part is a side surface; the right half comprises a top surface, a bottom surface and three side surfaces; the side surfaces of the left half part and the right half part, which are opposite to the side surface of the left half part, are respectively provided with a plurality of convex columns, and the convex columns are provided with insertion holes; the inner shell comprises an outer ring wall, a coil groove, an inner ring wall and a rear lead through hole, wherein the left part and the right part of the lower side of the outer ring wall are respectively provided with an installation boss and an installation screw hole thereof; wherein, a section of the outer ring wall above the left or right side mounting boss is provided with winding grooves and winding teeth which are spaced one by one, and the outer side of the outer ring wall section provided with the winding grooves and the winding teeth is provided with a lead groove and a lead groove outer wall; a mutual inductor is arranged in the inner shell; the mutual inductor includes: the coil comprises an iron rod, a heat dissipation rod, a molding material, a primary winding and a secondary winding; the iron rod is in a square shape and is arranged at the center of the metal shell; the primary winding enters the winding groove through the lead groove of the inner shell, passes through the winding teeth and is wound on the iron rod; the secondary winding penetrates through the rear lead through hole and is wound on the iron rod; the primary and secondary windings are electrically isolated from each other by the insulating material; the heat dissipation rod penetrates through the insulating material in a mode of not contacting with the primary winding and the secondary winding and is installed on the installation boss; the part of the inner shell, which is close to the outer ring wall, is filled with molding materials; redundant parts of the primary winding and the secondary winding are fixed through the coil slots; 4 or 8 heat dissipation rods; the heat dissipation rod is made of heat-conducting plastic, heat-conducting ceramic or graphite.
Further, the method of calculating a square value of the amplitude value of the current sample data performs the steps of: the square value of the amplitude value of the current sample data is calculated using the following formula:
wherein X is current sampling data of the current moment, and X1And x2Current sample data, T, for the first two momentsSFor the sampling period, ω is the phase value of the sampled current data.
Further, the transformer further comprises: the mutual inductance measuring device is used for measuring the real-time mutual inductance value of the accurate mutual inductor in real time; the method for measuring the real-time mutual inductance value of the mutual inductor comprises the following steps: searching a value of the load according to a mapping relation among the load, the mutual inductance and the primary side resonant current, and obtaining an optimal solution of the load according to an iteration termination condition and fitness ranking; determining a real-time mutual inductance value of the mutual inductor by utilizing the optimal solution of the load according to the mapping relation between the load and the mutual inductance; wherein the optimal solution calculation for the load uses the following formula:
wherein J is the optimal solution of the load, ip(T0) Is T0Current sample value at time, ip(T0+T)]For the current sample value after T time, ip(T0-T) a current sample value before time T.
Further, the transformer includes: the coil comprises an iron rod, a heat dissipation rod, a molding material, a primary winding and a secondary winding; the iron rod is in a square shape and is arranged at the center of the metal shell; the primary winding enters the winding groove through the lead groove of the inner shell, passes through the winding teeth and is wound on the iron rod; the secondary winding penetrates through the rear lead through hole and is wound on the iron rod; the primary and secondary windings are electrically isolated from each other by the insulating material; the heat dissipation rod penetrates through the insulating material in a mode of not contacting with the primary winding and the secondary winding and is installed on the installation boss; the part of the inner shell, which is close to the outer ring wall, is filled with molding materials; redundant parts of the primary winding and the secondary winding are fixed through the coil slots
A mutual inductor compensation method of an environment-friendly intelligent mutual inductor comprises the following steps: calculating time delay through the current sampling data, calculating a square value of an amplitude value of the current sampling data, calculating an imaginary part of the current sampling data, and performing rotation compensation on the current sampling data by using the calculated data to obtain compensated current sampling data; wherein the method for performing rotation compensation on the current sampling data by using the calculated data performs the following steps:
wherein, the x0And y0Is a coordinate value, x, of the original current sample datanAnd ynSampling data for the rotation compensated current, thetaiA phase value corresponding to the current sampling data; snSetting the rotation matrix parameter sequence as an amplitude value corresponding to the current sampling data; n is the number of current sampling data, thetaiIs a delay angle; the above-mentioned
Wherein L isiIs the theoretical frequency value of the transformer, Li' is the real-time frequency value at the time of sampling.
Further, the method for calculating the square value of the amplitude value of the current sampling data performs the following steps: the square value of the amplitude value of the current sample data is calculated using the following formula:
wherein X is current sampling data of the current moment, and X1And x2Current sample data, T, for the first two momentsSFor the sampling period, ω is the phase value of the sampled current data.
Further, the transformer further comprises: the mutual inductance measuring device is used for measuring the real-time mutual inductance value of the accurate mutual inductor in real time; the method for measuring the real-time mutual inductance value of the mutual inductor comprises the following steps: searching a value of the load according to a mapping relation among the load, the mutual inductance and the primary side resonant current, and obtaining an optimal solution of the load according to an iteration termination condition and fitness ranking; determining a real-time mutual inductance value of the mutual inductor by utilizing the optimal solution of the load according to the mapping relation between the load and the mutual inductance; wherein the optimal solution calculation for the load uses the following formula:
wherein J is the optimal solution of the load, ip(T0) Is T0Current sample value at time, ip(T0+T)]For the current sample value after T time, ip(T0-T) a current sample value before time T.
Further, the transformer includes: the coil comprises an iron rod, a heat dissipation rod, a molding material, a primary winding and a secondary winding; the iron rod is in a square shape and is arranged at the center of the metal shell; the primary winding enters the winding groove through the lead groove of the inner shell, passes through the winding teeth and is wound on the iron rod; the secondary winding penetrates through the rear lead through hole and is wound on the iron rod; the primary and secondary windings are electrically isolated from each other by the insulating material; the heat dissipation rod penetrates through the insulating material in a mode of not contacting with the primary winding and the secondary winding and is installed on the installation boss; the part of the inner shell, which is close to the outer ring wall, is filled with molding materials; redundant parts of the primary winding and the secondary winding are fixed through the coil slots
The environment-friendly intelligent mutual inductor and the mutual inductor compensation method have the following beneficial effects:
1. environmental protection and energy conservation: the inner shell and the outer shell can be detachably connected, and the shell assembling components are detachably connected, so that the assembly is convenient, the disassembly is convenient, the time and the labor are saved, and when the shell assembling device is used, the assembling components are only needed to be spliced and assembled; when needs are dismantled, directly dismantle into several parts before the installation with whole, labour saving and time saving reduces the manpower consumption, and the practicality is strong.
2. Easy to use and install: the object of the mutual inductor and the mutual inductor are separated, so that the mutual inductor is convenient to use and install, and compared with the traditional integrated mutual inductor, the mutual inductor is more convenient to install and better maintains when a fault occurs.
3. The energy-saving effect is good: the invention uses the saturation calculation device to calculate the saturation degree of the mutual inductor and control the mutual inductor to operate, thereby ensuring that the mutual inductor does not run excessively, ensuring that the mutual inductor has more efficient application of energy and realizing energy conservation and environmental protection. The saturation compensation device can ensure that the mutual inductor does not run excessively, so that the situation that the temperature of the mutual inductor is overhigh is caused, the inner shell of the mutual inductor does not need to use high-temperature resistant materials or reinforced inner shells, and the cost of the mutual inductor is reduced.
4. The mutual inductance performance is good: the mutual inductor can perform mutual inductance, and can also perform mutual inductor operation adjustment and time delay compensation according to the operation condition, thereby improving the performance of the mutual inductor.
5. The time delay compensation is accurate: the invention uses the time delay compensation device to carry out time delay compensation on the mutual inductor, because the mutual inductor has larger deviation of the measurement result because of the time delay of sampling when measuring, and the invention can eliminate the delay of the mutual inductor, thereby realizing more accurate measurement.
Drawings
Fig. 1 is a schematic structural diagram of an inner housing of an environment-friendly intelligent transformer according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a left half portion of an outer shell of an environment-friendly intelligent transformer according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a right half of an outer shell of an environment-friendly intelligent transformer according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an external overall structure of an environment-friendly intelligent transformer according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a transformer system of the environment-friendly intelligent transformer according to the embodiment of the invention;
fig. 6 is a schematic circuit structure diagram of an environment-friendly intelligent transformer according to an embodiment of the present invention;
fig. 7 is a schematic flow chart of a method of a transformer compensation method of an environment-friendly intelligent transformer according to an embodiment of the present invention.
Fig. 8 is a graph of an experiment comparing energy consumption conditions of the environment-friendly intelligent transformer provided by the embodiment of the invention and a transformer in the prior art.
The transformer comprises a lead slot outer wall 1, a lead slot 2, a winding slot 3, a winding tooth 4, an outer ring wall 5, a coil slot 6, an inner ring wall 7, a rear lead perforation 8, a mounting boss 9, a mounting screw hole 10, a convex column 11, a side face of a left half part 12, a side face of a right half part 13, a convex column 14, a jack 15, an outer shell 16, an insulating material 17, an inner shell 18, a transformer body 19, a time delay compensation device 20, a saturation compensation device 21, a transformer energy consumption experimental curve A, a transformer energy consumption curve B, a transformer energy consumption curve of the prior art and a secondary winding 1-1; 1-2-primary winding; 1-3-up-flow winding; 1-4-voltage regulator; 2-a delay compensation device; 2-1-a sampling unit of the delay compensation device; 2-2-a computing unit of the delay compensation device; 2-3-a compensation unit of the delay compensation device; 3-a saturation calculation device; 3-1-a sampling unit of a saturation calculation device; 3-2-connecting wires; 3-3-a computing unit of a saturation computing device; 3-4-sampling resistance; 3-5-saturation of the current secondary winding of the computing device; 3-6-current primary winding of saturation calculating means; 3-7-saturation of the voltage secondary winding of the computing device; 3-8-voltage conversion primary winding of saturation calculating means; 4-a synchronization wire; 5-current voltage sampling wire; .
Detailed Description
The method of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments of the invention.
Example 1
As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, and fig. 8, an environment-friendly smart transformer includes: the transformer comprises a mutual inductor, an outer shell and an inner shell; an insulating material is arranged between the outer shell and the inner shell; the mutual inductor is arranged in the inner shell; the mutual inductor includes: the transformer comprises a transformer body, a delay compensation device and a saturation calculation device; the time delay compensation device and the saturation calculation device are respectively in signal connection with the mutual inductor body; the time delay compensation device is used for carrying out time delay compensation on the mutual inductor; the saturation calculation device is used for calculating the saturation degree of the mutual inductor and controlling the mutual inductor to operate; the method for calculating the saturation degree of the mutual inductor by the saturation calculating device is characterized by comprising the following steps: the saturation calculation device acquires current sampling data of the mutual inductor, extracts a non-saturation interval in current according to the acquired sampling data, and records the non-saturation interval as G; calculating the upper limit value of the current sampling data according to the following formula:
wherein L ismaxIs an upper limit value, and N is the sampling frequency; constructing a middle matrix R according to the upper limit value obtained by calculation; decomposing the intermediate matrix R to obtain the characteristic parameter sigma of the intermediate matrixp(ii) a When the characteristic parameters of the intermediate matrix meet the following conditions:
judging that the mutual inductor reaches a saturated state, controlling the operation of the mutual inductor by a saturation calculation device so as to reduce the energy consumption of the mutual inductor, judging that the mutual inductor does not reach the saturated state and continuously operating the mutual inductor as usual if the characteristic parameter of the intermediate matrix does not meet the following condition, wherein η is the amplitude value of current sampling data, and epsilon is the frequency of the current sampling data, and the method for performing delay compensation on the mutual inductor by the delay compensation device comprises the following steps of calculating delay by the current sampling data, calculating the square value of the amplitude value of the current sampling data, calculating the imaginary part of the current sampling data, and then utilizing a meter to calculate the imaginary part of the current sampling dataThe calculated data pair carries out rotation compensation on the current sampling data to obtain compensated current sampling data; wherein the method for performing rotation compensation on the current sampling data by using the calculated data performs the following steps:
wherein, the x0And y0Is a coordinate value, x, of the original current sample datanAnd ynSampling data for the rotation compensated current, thetaiA phase value corresponding to the current sampling data; snSetting the rotation matrix parameter sequence as an amplitude value corresponding to the current sampling data; n is the number of current sampling data, thetaiIs a delay angle; the above-mentioned
Wherein L isiIs the theoretical frequency value of the transformer, Li' is the real-time frequency value at the time of sampling.
Specifically, the saturation compensation device can ensure that the mutual inductor does not run excessively, so that the mutual inductor has overhigh temperature, and the inner shell of the mutual inductor does not need to be made of high-temperature-resistant materials or reinforced inner shells, thereby reducing the cost of the mutual inductor.
Specifically, the delay compensation device is used for performing delay compensation on the mutual inductor; and the saturation calculation device is used for calculating the saturation degree of the mutual inductor and controlling the mutual inductor to operate. The saturation calculating device calculates the saturation degree of the mutual inductor and controls the mutual inductor to operate, so that the situation that the mutual inductor does not operate is guaranteed, the mutual inductor is more efficient in application of energy, and energy conservation and environmental protection are realized. The time delay compensation device carries out time delay compensation on the mutual inductor, and when the mutual inductor carries out measurement, the deviation of a measurement result is larger because of the time delay of sampling, but the time delay compensation device can eliminate the delay of the mutual inductor, so that more accurate measurement is realized.
Specifically, the current principle of judging the saturation of the current transformer mainly includes two types, one is based on a harmonic wave principle, and the other is based on a waveform recognition principle. Because the power system contains harmonic waves when the power system fails, the current transformer saturation criterion based on the harmonic wave principle can cause the failure or delay action of protection. The principle based on waveform identification is based on the knowledge of the saturated waveform of the current transformer, so that the protection cannot be ensured to be reliable and motionless when the current transformer is in a fault outside the area. Another limitation of the two types of judgment current transformer protection is that when the same-phase fault occurs in an external fault transfer area and the conversion time is short, the protection action time is long, and the protection is sometimes rejected.
Specifically, the delay compensation device includes: a sampling unit of the delay compensation device; a computing unit of the delay compensation device; and the compensation unit of the delay compensation device respectively performs sampling of delay compensation, calculation of delay compensation and rotation compensation of delay compensation.
Specifically, the saturation calculation means includes: a sampling unit of a saturation calculation device; connecting an electric wire; a calculation unit of a saturation calculation device; sampling a resistor; a current secondary winding of the saturation computing device; saturating a current primary winding of the computing device; a voltage secondary winding of the saturation calculation device; the voltage of the saturation computing device switches the primary winding.
Example 2
On the basis of the above embodiment, the intermediate matrix R is represented as:
where the r' bit calculates the absolute value of the difference between the two numbers.
Example 3
On the basis of the previous embodiment, the outer shell is made of a metal material; the outer housing includes: a left half and a right half; the left half part and the right half part are completely clamped to form a closed space; the left half part is a side surface; the right half comprises a top surface, a bottom surface and three side surfaces; the side surfaces of the left half part and the right half part, which are opposite to the side surface of the left half part, are respectively provided with a plurality of convex columns, and the convex columns are provided with insertion holes; the inner shell comprises an outer ring wall, a coil groove, an inner ring wall and a rear lead through hole, wherein the left part and the right part of the lower side of the outer ring wall are respectively provided with an installation boss and an installation screw hole thereof; wherein, a section of the outer ring wall above the left or right side mounting boss is provided with winding grooves and winding teeth which are spaced one by one, and the outer side of the outer ring wall section provided with the winding grooves and the winding teeth is provided with a lead groove and a lead groove outer wall; a mutual inductor is arranged in the inner shell; the mutual inductor includes: the coil comprises an iron rod, a heat dissipation rod, a molding material, a primary winding and a secondary winding; the iron rod is in a square shape and is arranged at the center of the metal shell; the primary winding enters the winding groove through the lead groove of the inner shell, passes through the winding teeth and is wound on the iron rod; the secondary winding penetrates through the rear lead through hole and is wound on the iron rod; the primary and secondary windings are electrically isolated from each other by the insulating material; the heat dissipation rod penetrates through the insulating material in a mode of not contacting with the primary winding and the secondary winding and is installed on the installation boss; the part of the inner shell, which is close to the outer ring wall, is filled with molding materials; redundant parts of the primary winding and the secondary winding are fixed through the coil slots; 4 or 8 heat dissipation rods; the heat dissipation rod is made of heat-conducting plastic, heat-conducting ceramic or graphite.
Specifically, the environment-friendly assembled plastic shell provided by the invention comprises two layers of shells, namely an inner shell and an outer shell; be provided with insulating material between shell body and the interior casing, can effectively protect the inside device of interior casing and avoid the influence of external environment, the operation effect of the inside device is guaranteed to the at utmost.
In addition, the inner shell and the outer shell can be formed by detachable connection, and a plurality of shell assembling parts can be detachably connected, so that the assembly and disassembly are convenient, the time and the labor are saved, and when the device is used, the assembling parts only need to be spliced and assembled; when needs are dismantled, directly dismantle into several parts before the installation with whole, labour saving and time saving reduces the manpower consumption, and the practicality is strong.
Specifically, the heat dissipation rod effectively guarantees that the heat that gives off in the mutual-inductor operation process can in time distribute away, avoids causing the trouble of mutual-inductor because overheated, has promoted the quality of mutual-inductor.
Example 4
The method for calculating the square value of the amplitude value of the current sampling data executes the following steps: the square value of the amplitude value of the current sample data is calculated using the following formula:
wherein X is current sampling data of the current moment, and X1And x2Current sample data, T, for the first two momentsSFor the sampling period, ω is the phase value of the sampled current data.
Example 5
On the basis of the above embodiment, the transformer further includes: the mutual inductance measuring device is used for measuring the real-time mutual inductance value of the accurate mutual inductor in real time; the method for measuring the real-time mutual inductance value of the mutual inductor comprises the following steps: searching a value of the load according to a mapping relation among the load, the mutual inductance and the primary side resonant current, and obtaining an optimal solution of the load according to an iteration termination condition and fitness ranking; determining a real-time mutual inductance value of the mutual inductor by utilizing the optimal solution of the load according to the mapping relation between the load and the mutual inductance; wherein the optimal solution calculation for the load uses the following formula:
wherein J is the optimal solution of the load, ip(T0) Is T0Current sample value at time, ip(T0+T)]For the current sample value after T time, ip(T0-T) a current sample value before time T.
Specifically, the real-time mutual inductance value measuring and calculating method is used, the mutual inductance values of the previous period and the next period are utilized, and then the mutual inductance values and the measured value at the moment are comprehensively measured and calculated, so that the obtained result is more accurate.
Example 6
The mutual inductor includes: the coil comprises an iron rod, a heat dissipation rod, a molding material, a primary winding and a secondary winding; the iron rod is in a square shape and is arranged at the center of the metal shell; the primary winding enters the winding groove through the lead groove of the inner shell, passes through the winding teeth and is wound on the iron rod; the secondary winding penetrates through the rear lead through hole and is wound on the iron rod; the primary and secondary windings are electrically isolated from each other by the insulating material; the heat dissipation rod penetrates through the insulating material in a mode of not contacting with the primary winding and the secondary winding and is installed on the installation boss; the part of the inner shell, which is close to the outer ring wall, is filled with molding materials; redundant parts of the primary winding and the secondary winding are fixed through the coil slots
Example 7
A mutual inductor compensation method of an environment-friendly intelligent mutual inductor comprises the following steps: calculating time delay through the current sampling data, calculating a square value of an amplitude value of the current sampling data, calculating an imaginary part of the current sampling data, and performing rotation compensation on the current sampling data by using the calculated data to obtain compensated current sampling data; wherein the method for performing rotation compensation on the current sampling data by using the calculated data performs the following steps:
wherein, the x0And y0Is a coordinate value, x, of the original current sample datanAnd ynSampling data for the rotation compensated current, thetaiA phase value corresponding to the current sampling data; snSetting the rotation matrix parameter sequence as an amplitude value corresponding to the current sampling data; n is the number of current sampling data, thetaiIs a delay angle; the above-mentioned
Wherein L isiIs the theoretical frequency value of the mutual inductor,Li' is the real-time frequency value at the time of sampling.
Example 8
On the basis of the above embodiment, the method of calculating the square value of the amplitude value of the current sample data performs the following steps: the square value of the amplitude value of the current sample data is calculated using the following formula:
wherein X is current sampling data of the current moment, and X1And x2Current sample data, T, for the first two momentsSFor the sampling period, ω is the phase value of the sampled current data.
Specifically, when a current in one coil changes, an induced electromotive force is generated in the adjacent other coil, which is called a mutual inductance phenomenon. The mutual inductance phenomenon is a common electromagnetic induction phenomenon, and occurs not only between two coils wound on the same core, but also between any two circuits close to each other.
Example 9
On the basis of the above embodiment, the transformer further includes: the mutual inductance measuring device is used for measuring the real-time mutual inductance value of the accurate mutual inductor in real time; the method for measuring the real-time mutual inductance value of the mutual inductor comprises the following steps: searching a value of the load according to a mapping relation among the load, the mutual inductance and the primary side resonant current, and obtaining an optimal solution of the load according to an iteration termination condition and fitness ranking; determining a real-time mutual inductance value of the mutual inductor by utilizing the optimal solution of the load according to the mapping relation between the load and the mutual inductance; wherein the optimal solution calculation for the load uses the following formula:
wherein J is the optimal solution of the load, ip(T0) Is T0Current sample value at time, ip(T0+T)]For the current sample value after T time, ip(T0-T) a current sample value before time T.
Example 10
On the basis of the above embodiment, the transformer includes: the coil comprises an iron rod, a heat dissipation rod, a molding material, a primary winding and a secondary winding; the iron rod is in a square shape and is arranged at the center of the metal shell; the primary winding enters the winding groove through the lead groove of the inner shell, passes through the winding teeth and is wound on the iron rod; the secondary winding penetrates through the rear lead through hole and is wound on the iron rod; the primary and secondary windings are electrically isolated from each other by the insulating material; the heat dissipation rod penetrates through the insulating material in a mode of not contacting with the primary winding and the secondary winding and is installed on the installation boss; the part of the inner shell, which is close to the outer ring wall, is filled with molding materials; redundant parts of the primary winding and the secondary winding are fixed through the coil slots
Specifically, the primary winding is adjustable, and the secondary multi-winding current transformer is provided. The current transformer is characterized by more transformation ratio and measurement range, and can be changed, which is commonly seen in high-voltage current transformers. The primary winding is divided into two sections which respectively penetrate through iron cores of the mutual inductors, and the secondary winding is divided into two independent windings with taps and different accuracy levels. The primary winding is connected with a connecting sheet arranged on the outer side of the mutual inductor, and the primary winding forms a serial connection line or a parallel connection line by changing the position of the connecting sheet, so that the number of turns of the primary winding is changed to obtain different transformation ratios. The secondary winding with taps is divided into two windings with different transformation ratios and different accuracy levels, the number of turns of the primary winding is correspondingly changed along with the change of the position of the connecting piece of the primary winding, and the transformation ratio is changed along with the change of the number of turns of the primary winding, so that the multi-range transformation ratio is formed. The secondary independent winding with taps has different transformation ratios and different accuracy levels, and can be respectively applied to electric energy metering, an indicating instrument, a transmitter, relay protection and the like so as to meet different use requirements of the secondary independent winding with taps.
The above description is only an embodiment of the present invention, but not intended to limit the scope of the present invention, and any structural changes made according to the present invention should be considered as being limited within the scope of the present invention without departing from the spirit of the present invention.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process and related description of the system described above may refer to the corresponding process in the foregoing method embodiments, and will not be described herein again.
It should be noted that, the system provided in the foregoing embodiment is only illustrated by dividing the functional modules, and in practical applications, the functions may be distributed by different functional modules according to needs, that is, the modules or steps in the embodiment of the present invention are further decomposed or combined, for example, the modules in the foregoing embodiment may be combined into one module, or may be further split into multiple sub-modules, so as to complete all or part of the functions described above. The names of the modules and steps involved in the embodiments of the present invention are only for distinguishing the modules or steps, and are not to be construed as unduly limiting the present invention.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes and related descriptions of the storage device and the processing device described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Those of skill in the art would appreciate that the various illustrative modules, method steps, and modules described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that programs corresponding to the software modules, method steps may be located in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. To clearly illustrate this interchangeability of electronic hardware and software, various illustrative components and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as electronic hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing or implying a particular order or sequence.
The terms "comprises," "comprising," or any other similar term are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. An environment-friendly intelligent transformer, comprising: the transformer comprises a mutual inductor, an outer shell and an inner shell; an insulating material is arranged between the outer shell and the inner shell; the mutual inductor is arranged in the inner shell; the mutual inductor includes: the transformer comprises a transformer body, a delay compensation device and a saturation calculation device; the time delay compensation device and the saturation calculation device are respectively in signal connection with the mutual inductor body; the time delay compensation device is used for carrying out time delay compensation on the mutual inductor; the saturation calculation device is used for calculating the saturation degree of the mutual inductor and controlling the mutual inductor to operate; the method for calculating the saturation degree of the mutual inductor by the saturation calculating device is characterized by comprising the following steps: the saturation calculation device obtains current sampling data of the mutual inductor and extracts the current sampling data according to the collected sampling dataTaking out a non-saturation interval in the current, and marking as G; calculating the upper limit value of the current sampling data according to the following formula:
wherein L ismaxIs an upper limit value, and N is the sampling frequency; constructing a middle matrix R according to the upper limit value obtained by calculation; decomposing the intermediate matrix R to obtain the characteristic parameter sigma of the intermediate matrixp(ii) a When the characteristic parameters of the intermediate matrix meet the following conditions:
the method comprises the following steps of calculating time delay through current sampling data, calculating a square value of the amplitude value of the current sampling data, calculating an imaginary part of the current sampling data, and performing rotation compensation on the current sampling data by using the calculated data to obtain compensated current sampling data, wherein the method for performing the rotation compensation on the current sampling data by using the calculated data comprises the following steps:
wherein, the x0And y0Is a coordinate value, x, of the original current sample datanAnd ynSampling data for the rotation compensated current, thetaiA phase value corresponding to the current sampling data; snSetting the rotation matrix parameter sequence as an amplitude value corresponding to the current sampling data; n is the number of current sampling data, thetaiIs a delay angle; the above-mentioned
Wherein L isiIs the theoretical frequency value of the transformer, Li' is the real-time frequency value at the time of sampling.
2. The instrument transformer of claim 1, wherein the intermediate matrix R is represented as:
where the r' bit calculates the absolute value of the difference between the two numbers.
3. The instrument transformer of claim 3, wherein the outer shell is made of a metallic material; the outer housing includes: a left half and a right half; the left half part and the right half part are completely clamped to form a closed space; the left half part is a side surface; the right half comprises a top surface, a bottom surface and three side surfaces; the side surfaces of the left half part and the right half part, which are opposite to the side surface of the left half part, are respectively provided with a plurality of convex columns, and the convex columns are provided with insertion holes; the inner shell comprises an outer ring wall, a coil groove, an inner ring wall and a rear lead through hole, wherein the left part and the right part of the lower side of the outer ring wall are respectively provided with an installation boss and an installation screw hole thereof; wherein, a section of the outer ring wall above the left or right side mounting boss is provided with winding grooves and winding teeth which are spaced one by one, and the outer side of the outer ring wall section provided with the winding grooves and the winding teeth is provided with a lead groove and a lead groove outer wall; a mutual inductor is arranged in the inner shell; the mutual inductor includes: the coil comprises an iron rod, a heat dissipation rod, a molding material, a primary winding and a secondary winding; the iron rod is in a square shape and is arranged at the center of the metal shell; the primary winding enters the winding groove through the lead groove of the inner shell, passes through the winding teeth and is wound on the iron rod; the secondary winding penetrates through the rear lead through hole and is wound on the iron rod; the primary and secondary windings are electrically isolated from each other by the insulating material; the heat dissipation rod penetrates through the insulating material in a mode of not contacting with the primary winding and the secondary winding and is installed on the installation boss; the part of the inner shell, which is close to the outer ring wall, is filled with molding materials; redundant parts of the primary winding and the secondary winding are fixed through the coil slots; 4 or 8 heat dissipation rods; the heat dissipation rod is made of heat-conducting plastic, heat-conducting ceramic or graphite.
4. The instrument transformer of claim 3, wherein the method of calculating the square of the amplitude values of the current sample data performs the steps of: the square value of the amplitude value of the current sample data is calculated using the following formula:
wherein X is current sampling data of the current moment, and X1And x2Current sample data, T, for the first two momentsSFor the sampling period, ω is the phase value of the sampled current data.
5. The instrument transformer of claim 4, wherein the instrument transformer further comprises: the mutual inductance measuring device is used for measuring the real-time mutual inductance value of the accurate mutual inductor in real time; the method for measuring the real-time mutual inductance value of the mutual inductor comprises the following steps: searching a value of the load according to a mapping relation among the load, the mutual inductance and the primary side resonant current, and obtaining an optimal solution of the load according to an iteration termination condition and fitness ranking; determining a real-time mutual inductance value of the mutual inductor by utilizing the optimal solution of the load according to the mapping relation between the load and the mutual inductance; wherein the optimal solution calculation for the load uses the following formula:
wherein J is the optimal solution of the load, ip(T0) Is T0Current sample value at time, ip(T0+T)]For the current sample value after T time, ip(T0-T) a current sample value before time T.
6. The instrument transformer of claim 5, wherein the instrument transformer comprises: the coil comprises an iron rod, a heat dissipation rod, a molding material, a primary winding and a secondary winding; the iron rod is in a square shape and is arranged at the center of the metal shell; the primary winding enters the winding groove through the lead groove of the inner shell, passes through the winding teeth and is wound on the iron rod; the secondary winding penetrates through the rear lead through hole and is wound on the iron rod; the primary and secondary windings are electrically isolated from each other by the insulating material; the heat dissipation rod penetrates through the insulating material in a mode of not contacting with the primary winding and the secondary winding and is installed on the installation boss; the part of the inner shell, which is close to the outer ring wall, is filled with molding materials; and redundant parts of the primary winding and the secondary winding are fixed through the coil slots.
7. A transformer compensation method based on the environment-friendly intelligent transformer of claim 5 of one of claims 1 to 6, characterized in that the method performs the following steps: calculating time delay through the current sampling data, calculating a square value of an amplitude value of the current sampling data, calculating an imaginary part of the current sampling data, and performing rotation compensation on the current sampling data by using the calculated data to obtain compensated current sampling data; wherein the method for performing rotation compensation on the current sampling data by using the calculated data performs the following steps:
wherein, the x0And y0Is a coordinate value, x, of the original current sample datanAnd ynSampling data for the rotation compensated current, thetaiA phase value corresponding to the current sampling data; snSetting the amplitude corresponding to the current sampling data for rotating the parameter sequence of the matrixA value of the metric; n is the number of current sampling data, thetaiIs a delay angle; the above-mentioned
Wherein L isiIs the theoretical frequency value of the transformer, Li' is the real-time frequency value at the time of sampling.
8. The method of claim 7, wherein the method of calculating the square of the magnitude value of the current sample data performs the steps of: the square value of the amplitude value of the current sample data is calculated using the following formula:
wherein X is current sampling data of the current moment, and X1And x2Current sample data, T, for the first two momentsSFor the sampling period, ω is the phase value of the sampled current data.
9. The method of claim 8, wherein the transformer further comprises: the mutual inductance measuring device is used for measuring the real-time mutual inductance value of the accurate mutual inductor in real time; the method for measuring the real-time mutual inductance value of the mutual inductor comprises the following steps: searching a value of the load according to a mapping relation among the load, the mutual inductance and the primary side resonant current, and obtaining an optimal solution of the load according to an iteration termination condition and fitness ranking; determining a real-time mutual inductance value of the mutual inductor by utilizing the optimal solution of the load according to the mapping relation between the load and the mutual inductance; wherein the optimal solution calculation for the load uses the following formula:
wherein J is the optimal solution of the load, ip(T0) Is T0Current sample value at time, ip(T0+T)]For the current sample value after T time, ip(T0-T) a current sample value before time T.
10. The method of claim 9, wherein the transformer comprises: the coil comprises an iron rod, a heat dissipation rod, a molding material, a primary winding and a secondary winding; the iron rod is in a square shape and is arranged at the center of the metal shell; the primary winding enters the winding groove through the lead groove of the inner shell, passes through the winding teeth and is wound on the iron rod; the secondary winding penetrates through the rear lead through hole and is wound on the iron rod; the primary and secondary windings are electrically isolated from each other by the insulating material; the heat dissipation rod penetrates through the insulating material in a mode of not contacting with the primary winding and the secondary winding and is installed on the installation boss; the part of the inner shell, which is close to the outer ring wall, is filled with molding materials; and redundant parts of the primary winding and the secondary winding are fixed through the coil slots.
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| US6479976B1 (en) * | 2001-06-28 | 2002-11-12 | Thomas G. Edel | Method and apparatus for accurate measurement of pulsed electric currents utilizing ordinary current transformers |
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| CN103293363A (en) * | 2013-07-02 | 2013-09-11 | 东南大学 | Time delay compensation method for mutual inductor sampling value |
| CN103854841A (en) * | 2012-12-06 | 2014-06-11 | 上海浦东金盛互感器厂 | Error compensation method for current transformer capable of being accompanied by direct current |
| CN106783112A (en) * | 2017-02-28 | 2017-05-31 | 南通壹选工业设计有限公司 | A kind of dismountable voltage transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6479976B1 (en) * | 2001-06-28 | 2002-11-12 | Thomas G. Edel | Method and apparatus for accurate measurement of pulsed electric currents utilizing ordinary current transformers |
| US20070007943A1 (en) * | 2004-05-10 | 2007-01-11 | Myungji University | Compensated current differential relaying method and system for protecting transformer |
| CN103854841A (en) * | 2012-12-06 | 2014-06-11 | 上海浦东金盛互感器厂 | Error compensation method for current transformer capable of being accompanied by direct current |
| CN103293363A (en) * | 2013-07-02 | 2013-09-11 | 东南大学 | Time delay compensation method for mutual inductor sampling value |
| CN106783112A (en) * | 2017-02-28 | 2017-05-31 | 南通壹选工业设计有限公司 | A kind of dismountable voltage transformer |
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