CN111208373A - Mutual load method-based transformer rated operation condition simulation method and system - Google Patents
Mutual load method-based transformer rated operation condition simulation method and system Download PDFInfo
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Abstract
The invention discloses a mutual load method-based transformer rated operation condition simulation method and an implementation system thereof, wherein the method comprises the following steps: determining a rated operation condition to be simulated and rated parameters; setting the connection modes of the two three-phase transformers and the connection auxiliary equipment according to the determined rated operation condition to be simulated and rated parameters and preset rules; adjusting the parameter setting of the connection auxiliary equipment according to a preset rule to realize operation under a rated operation condition; the method and the system realize a synthetic loop of rated voltage and current through mutual load connection of two three-phase transformers, realize real simulation of rated operation conditions through the arrangement of auxiliary equipment such as a step-up transformer and the like, truly reproduce various operation states of the transformers under laboratory conditions, and provide a site real condition reproduction basis for reproduction of transformer faults, component monitoring and performance evaluation of a sensing detection device in the next step.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a transformer rated operation condition simulation method and system based on a mutual load method.
Background
With the gradual and deep application of intelligent devices in daily life, energy and power safety is increasingly gaining prominence as an important component of national safety in China, the reliability requirement on power equipment is continuously improved, and the detection and diagnosis technology of the existing power transformer can not meet the requirement of preventing and early warning major accidents. At present, intelligent transformers develop towards the directions of energy conservation, environmental protection, intellectualization and integration, in order to further improve the reliable operation level of the transformers and improve the effectiveness of monitoring and detecting devices, the actual operation working conditions of the transformers need to be reproduced to construct a transformer operation platform, but the simulation transformer platform constructed at home and abroad singly meets the requirements of voltage grade or current of the transformers under the actual operation, has a large difference with the high-voltage and high-current synthetic environment under the rated operation working conditions of the real transformers, cannot reflect the operation state of real defects of equipment, and restricts the research and development of various sensing and detecting technologies in laboratories.
Disclosure of Invention
In order to solve the problem that the running state of the real defect of equipment cannot be reflected by the existing transformer simulation in the background art, the invention provides a transformer rated running working condition simulation method and system based on a mutual load method, the method and the system realize a synthetic loop of rated voltage and current by mutual load connection of two three-phase transformers, and realize the real simulation of the rated running working condition by a boosting transformer; the transformer rated operation condition simulation method based on the mutual load method comprises the following steps:
determining a rated operation condition to be simulated and rated parameters;
setting the connection modes of the two three-phase transformers and the connection auxiliary equipment according to the determined rated operation condition to be simulated and rated parameters and preset rules; the two three-phase transformers have the same transformation ratio, connection group labels and capacity; the connection auxiliary equipment comprises a boosting transformer and a single-phase current source;
and adjusting the parameter setting of the connection auxiliary equipment according to a preset rule to realize operation under a rated working condition.
Furthermore, when the rated parameter to be simulated is the rated voltage no-load operation,
correspondingly connecting the secondary side of the boosting transformer with the medium voltage sides of a three-phase transformer T1 and a three-phase transformer T2; connecting a three-phase transformer T1 and the high-voltage side of a transformer T2 in parallel, and idling the low-voltage side; the primary side of the boosting transformer is connected with a power supply;
rated voltage is supplied to the three-phase transformer T1 and the three-phase transformer T2 through the step-up transformer, and operation under no-load condition at the rated voltage is realized.
Further, when the rated parameter to be simulated is the rated current and the rated operation mode to be simulated is the high-voltage rated operation mode:
correspondingly connecting the secondary side of the boosting transformer with the medium voltage sides of a three-phase transformer T1 and a three-phase transformer T2; connecting a three-phase transformer T1 and the high-voltage side of a transformer T2 in parallel, and idling the low-voltage side; the primary side of the boosting transformer is connected with a power supply;
adjusting high-voltage side tapping switches of the two three-phase transformers, and enabling the step-up transformer to supply power to the two three-phase transformers according to a preset initial voltage through a power supply;
acquiring and measuring the voltage between secondary side windings of two three-phase transformers in real time to obtain the maximum voltage difference between the secondary side windings;
calculating according to the maximum voltage difference through a preset rule to obtain maximum circulating current;
calculating a ratio K of rated current to the maximum circulating current;
and adjusting the output voltage of the step-up transformer to be K times of the initial voltage, so as to realize the operation of the high-voltage rated operation working condition of rated voltage.
Further, the calculating according to the maximum voltage difference and a preset rule to obtain the maximum circulating current includes:
calculating to obtain the maximum circulating current through a maximum voltage difference and a preset calculation formula, wherein the calculation formula is as follows:
wherein, I' is the maximum circulating current; Δ U is the maximum voltage difference;
wherein, UNIs a rated voltage; i isNRated current; e.g. of the typek1Short-circuit impedance of the three-phase transformer T1; e.g. of the typek2Is the short-circuit impedance of the three-phase transformer T2.
Furthermore, the tap switch on the high-voltage side of each three-phase transformer is provided with N gears, and 2N preset current operation working conditions are obtained by adjusting the tap switch of each three-phase transformer.
Further, when the rated parameter to be simulated is the rated current and the rated operation mode to be simulated is the medium-voltage rated operation mode:
correspondingly connecting the secondary side of the boosting transformer with the medium voltage sides of a three-phase transformer T1 and a three-phase transformer T2; connecting a three-phase transformer T1 and the high-voltage side of a transformer T2 in parallel, and idling the low-voltage side; the primary side of the boosting transformer is connected with a power supply;
two ends of a single-phase current source are respectively connected with central point lead wires of medium voltage windings of two three-phase transformers; the medium voltage windings of the two three-phase transformers are in star connection; the central point lead can bear 3 times of rated current;
the output current of the single-phase current source is adjusted to be 3 times of the rated current of the medium-voltage side, and the operation of the medium-voltage rated operation condition of the rated voltage is realized.
The transformer rated operation condition simulation realization system based on the mutual load method comprises the following steps:
the instruction receiving unit is used for determining a rated operation condition and rated parameters to be simulated according to a user instruction;
the simulation connection unit is used for setting the connection modes of the two three-phase transformers and the connection auxiliary equipment according to a preset rule according to the determined rated operation condition to be simulated and rated parameters; the two three-phase transformers have the same transformation ratio, connection group labels and capacity; the connection auxiliary equipment comprises a boosting transformer and a single-phase current source;
and the parameter setting unit is used for adjusting the parameter setting of the connection auxiliary equipment according to a preset rule to realize the operation under a rated working condition.
Further, when the instruction receiving unit receives that the rated parameter to be simulated is rated voltage no-load operation, the simulation connecting unit correspondingly connects the secondary side of the step-up transformer with the medium voltage sides of the three-phase transformer T1 and the three-phase transformer T2; connecting a three-phase transformer T1 and the high-voltage side of a transformer T2 in parallel, and idling the low-voltage side; the primary side of the boosting transformer is connected with a power supply;
the parameter setting unit is used for supplying rated voltage to the three-phase transformer T1 and the three-phase transformer T2 through the boosting transformer, and the operation under no-load working condition under the rated voltage is realized.
Further, when the command receiving unit receives that the rated parameter to be simulated is the rated current and the rated operation mode to be simulated is the high-voltage rated operation mode;
the analog connection unit is used for correspondingly connecting the secondary side of the boosting transformer with the medium voltage sides of a three-phase transformer T1 and a three-phase transformer T2; connecting a three-phase transformer T1 and the high-voltage side of a transformer T2 in parallel, and idling the low-voltage side; the primary side of the boosting transformer is connected with a power supply;
the analog connection unit is used for adjusting high-voltage side tapping switches of the two three-phase transformers and enabling the booster transformer to supply power to the two three-phase transformers according to preset initial voltage through a power supply;
the parameter setting unit is used for acquiring and measuring the voltage between the secondary side windings of the two three-phase transformers in real time to obtain the maximum voltage difference between the secondary side windings;
the parameter setting unit is used for calculating according to the maximum voltage difference through a preset rule to obtain maximum circulating current;
the parameter setting unit is used for calculating a ratio K of rated current to the maximum circulating current;
the parameter setting unit is used for adjusting the output voltage of the boosting transformer to be K times of the initial voltage, and the operation of the high-voltage rated operation working condition of rated voltage is realized.
Further, the parameter setting unit is configured to calculate and obtain the maximum circulating current through a maximum voltage difference and a preset calculation formula, where the calculation formula is:
wherein, I' is the maximum circulating current; Δ U is the maximum voltage difference;
wherein, UNIs a rated voltage; i isNRated current; e.g. of the typek1Short-circuit impedance of the three-phase transformer T1; e.g. of the typek2Is a three-phase transformerShort circuit resistance of T2.
Furthermore, the tap switch on the high-voltage side of each three-phase transformer is provided with N gears, and the parameter setting unit is used for obtaining 2N preset current operation conditions by adjusting the tap switch of each three-phase transformer.
Further, when the command receiving unit receives that the rated parameter to be simulated is the rated current and the rated operation mode to be simulated is the medium-voltage rated operation mode:
the analog connection unit is used for correspondingly connecting the secondary side of the boosting transformer with the medium voltage sides of a three-phase transformer T1 and a three-phase transformer T2; connecting a three-phase transformer T1 and the high-voltage side of a transformer T2 in parallel, and idling the low-voltage side; the primary side of the boosting transformer is connected with a power supply;
the analog connection unit is used for respectively connecting two ends of a single-phase current source with central point leads of medium voltage windings of the two three-phase transformers; the medium voltage windings of the two three-phase transformers are in star connection; the central point lead can bear 3 times of rated current;
the parameter setting unit is used for adjusting the output current of the single-phase current source to be 3 times of the rated current of the medium-voltage side, and the operation of the medium-voltage rated operation condition of the rated voltage is realized.
The invention has the beneficial effects that: the technical scheme of the invention provides a method and a system for simulating rated operation conditions of a transformer based on a mutual load method, wherein the method and the system realize a synthetic loop of rated voltage and current by mutual load connection of two three-phase transformers, realize real simulation of the rated operation conditions by the arrangement of auxiliary equipment such as a boosting transformer, a single-phase current source and the like, truly reproduce various operation states of the transformer under laboratory conditions, and provide a foundation for reproducing real conditions on site for the next step of reproducing faults of the transformer, monitoring components and evaluating the performance of a sensing detection device.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a flowchart of a method for simulating rated operation conditions of a transformer based on a mutual loading method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a rated operation connection on the high-voltage side of a transformer according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a voltage side rated operational connection in a transformer according to an embodiment of the present invention;
fig. 4 is a structural diagram of a transformer rated operation condition simulation system based on a mutual load method according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
FIG. 1 is a flowchart of a method for simulating rated operation conditions of a transformer based on a mutual loading method according to an embodiment of the present invention; as shown in fig. 1, the method includes:
in this embodiment, the specific requirements of the rated operating condition of the transformer are determined according to the received user instruction, and the specific requirements specifically include: reproduction of the rated voltage; reproducing rated current in a high-voltage rated operation mode; reproducing the rated current in a medium-voltage rated operation mode;
the two three-phase transformers have the same parameters, and are connected with each other in a mutual connection mode to form a synthetic loop which is connected with each other in a load mode and realizes rated voltage and rated current, and the operation conditions of the synthetic loop are the same as the actual rated operation working conditions of the transformers.
And step 130, adjusting the parameter setting of the auxiliary connection equipment according to a preset rule, and realizing operation under a rated working condition.
According to different user instructions, the connection auxiliary devices and the setting method that need to set parameters are different, and this embodiment further specifically describes:
firstly, a received user instruction is that rated parameters to be simulated are set to be rated voltage no-load operation;
correspondingly connecting the secondary side of the boosting transformer T3 with the medium voltage sides of a three-phase transformer T1 and a three-phase transformer T2; connecting a three-phase transformer T1 and the high-voltage side of a transformer T2 in parallel, and idling the low-voltage side; the primary side of the step-up transformer T3 is connected with a power supply;
rated voltage is supplied to the three-phase transformer T1 and the three-phase transformer T2 through the step-up transformer T3, and operation under no-load condition at the rated voltage is realized.
Secondly, the received user instruction is that the rated parameter to be simulated is set as rated current, and the rated operation mode to be simulated is a high-voltage rated operation mode;
as shown in fig. 2, the secondary side of the step-up transformer is correspondingly connected to the medium voltage side of the three-phase transformer T1 and the three-phase transformer T2; connecting a three-phase transformer T1 and the high-voltage side of a transformer T2 in parallel, and idling the low-voltage side; the primary side of the step-up transformer T3 is connected with a power supply;
adjusting high-voltage side tapping switches of the two three-phase transformers, and enabling the step-up transformer T3 to supply power to the two three-phase transformers according to a preset initial voltage through a power supply;
acquiring and measuring the voltage between secondary side windings of two three-phase transformers in real time to obtain the maximum voltage difference between the secondary side windings;
calculating according to the maximum voltage difference through a preset rule to obtain maximum circulating current; the calculation formula for calculating the maximum circulating current is as follows:
wherein, I' is the maximum circulating current; Δ U is the maximum voltage difference;
wherein, UNIs a rated voltage; i isNRated current; e.g. of the typek1Short-circuit impedance of the three-phase transformer T1; e.g. of the typek2Is the short-circuit impedance of the three-phase transformer T2.
Calculating a ratio K of rated current to the maximum circulating current;
and adjusting the output voltage of the step-up transformer T3 to be K times of the initial voltage, so as to realize the operation of the high-voltage rated operation condition of rated voltage.
In this operation mode, the three-phase transformer T1 and the three-phase transformer T2 have different medium-voltage side currents, the side current is supplied by the step-up transformer T3, and both the core loss and the copper loss are supplied by the step-up transformer T3.
Furthermore, in the operation mode, circulating currents of different gears can be obtained by adjusting the high-voltage side tap switch so as to meet the requirements of different test conditions. The tap switch on the high-voltage side of each three-phase transformer is provided with N gears, and 2N preset current operation working conditions are obtained by adjusting the tap switch of each three-phase transformer.
Thirdly, the received user instruction is that the rated parameter to be simulated is set as a rated current, and the rated operation mode to be simulated is a medium-voltage rated operation mode;
as shown in fig. 3, the secondary side of the step-up transformer T3 is correspondingly connected to the medium voltage side of the three-phase transformer T1 and the three-phase transformer T2; connecting a three-phase transformer T1 and the high-voltage side of a transformer T2 in parallel, and idling the low-voltage side; the primary side of the step-up transformer T3 is connected with a power supply;
two ends of a single-phase current source G1 are respectively connected with central point lead wires of medium voltage windings of two three-phase transformers; the medium voltage windings of the two three-phase transformers are in star connection; the central point lead can bear 3 times of rated current;
the output current of the single-phase current source G1 is adjusted to be 3 times of the rated current of the medium-voltage side, and the operation of the medium-voltage rated operation condition of the rated voltage is realized.
This mode of operation requires a star connection on the medium voltage side, core losses provided by step-up transformer T3, and copper losses provided by single-phase current source G1.
Fig. 4 is a structural diagram of a transformer rated operation condition simulation system based on a mutual load method according to an embodiment of the present invention, and as shown in fig. 4, the system includes:
the simulation system comprises an instruction receiving unit 410, wherein the instruction receiving unit 410 is used for determining a rated operation condition to be simulated and rated parameters according to a user instruction;
the simulation connection unit 420 is used for setting the connection modes of the two three-phase transformers and the connection auxiliary equipment according to a preset rule according to the determined rated operation condition to be simulated and rated parameters; the two three-phase transformers have the same transformation ratio, connection group labels and capacity; the connection auxiliary equipment comprises a boosting transformer and a single-phase current source;
and a parameter setting unit 430, where the parameter setting unit 430 is configured to adjust parameter settings of the connection auxiliary equipment according to a preset rule, so as to implement operation under a rated working condition.
Further, when the command receiving unit 410 receives that the rated parameter to be simulated is the rated voltage no-load operation, the simulation connecting unit 420 correspondingly connects the secondary side of the step-up transformer with the medium voltage sides of the three-phase transformer T1 and the three-phase transformer T2; connecting a three-phase transformer T1 and the high-voltage side of a transformer T2 in parallel, and idling the low-voltage side; the primary side of the boosting transformer is connected with a power supply;
the parameter setting unit 430 is configured to supply rated voltage to the three-phase transformer T1 and the three-phase transformer T2 through the step-up transformer, so as to implement operation under no-load condition under the rated voltage.
Further, when the command receiving unit 410 receives that the rated parameter to be simulated is the rated current and the rated operation mode to be simulated is the high-voltage rated operation mode;
the analog connection unit 420 is configured to correspondingly connect the secondary side of the step-up transformer to the medium-voltage sides of the three-phase transformer T1 and the three-phase transformer T2; connecting a three-phase transformer T1 and the high-voltage side of a transformer T2 in parallel, and idling the low-voltage side; the primary side of the boosting transformer is connected with a power supply;
the analog connection unit 420 is configured to adjust high-voltage side tap switches of the two three-phase transformers, and enable the step-up transformer to supply power to the two three-phase transformers according to a preset initial voltage through a power supply;
the parameter setting unit 430 is configured to collect and measure voltages between secondary side windings of two three-phase transformers in real time to obtain a maximum voltage difference between the secondary side windings;
the parameter setting unit 430 is configured to calculate a maximum circulating current according to the maximum voltage difference by using a preset rule;
the parameter setting unit 430 is configured to calculate a ratio K of a rated current to the maximum circulation current;
the parameter setting unit 430 is configured to adjust the output voltage of the step-up transformer to be K times of the initial voltage, so as to implement operation under a high-voltage rated operation condition of a rated voltage.
Further, the parameter setting unit 430 is configured to calculate and obtain the maximum circulating current through a maximum voltage difference and a preset calculation formula, where the calculation formula is:
wherein, I' is the maximum circulating current; Δ U is the maximum voltage difference;
wherein, UNIs a rated voltage; i isNRated current; e.g. of the typek1Short-circuit impedance of the three-phase transformer T1; e.g. of the typek2Is the short-circuit impedance of the three-phase transformer T2.
Further, the tap switch on the high-voltage side of each three-phase transformer has N gears, and the parameter setting unit 430 is configured to obtain 2N preset current operating conditions by adjusting the tap switch of each of the two three-phase transformers.
Further, when the command receiving unit 410 receives that the rated parameter to be simulated is the rated current and the rated operation mode to be simulated is the medium-voltage rated operation mode:
the analog connection unit 420 is configured to correspondingly connect the secondary side of the step-up transformer to the medium-voltage sides of the three-phase transformer T1 and the three-phase transformer T2; connecting a three-phase transformer T1 and the high-voltage side of a transformer T2 in parallel, and idling the low-voltage side; the primary side of the boosting transformer is connected with a power supply;
the analog connection unit 420 is used for connecting two ends of a single-phase current source with central point leads of medium voltage windings of two three-phase transformers respectively; the medium voltage windings of the two three-phase transformers are in star connection; the central point lead can bear 3 times of rated current;
the parameter setting unit 430 is configured to adjust the output current of the single-phase current source to be 3 times of the medium-voltage side rated current, so as to implement operation under the medium-voltage rated operation condition of the rated voltage.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the disclosure may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Reference to step numbers in this specification is only for distinguishing between steps and is not intended to limit the temporal or logical relationship between steps, which includes all possible scenarios unless the context clearly dictates otherwise.
Moreover, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the disclosure and form different embodiments. For example, any of the embodiments claimed in the claims can be used in any combination.
Various component embodiments of the disclosure may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. The present disclosure may also be embodied as device or system programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present disclosure may be stored on a computer-readable medium or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the disclosure, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The disclosure may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several systems, several of these systems may be embodied by one and the same item of hardware.
The foregoing is directed to embodiments of the present disclosure, and it is noted that numerous improvements, modifications, and variations may be made by those skilled in the art without departing from the spirit of the disclosure, and that such improvements, modifications, and variations are considered to be within the scope of the present disclosure.
Claims (12)
1. A transformer rated operation condition simulation method based on a mutual load method is characterized by comprising the following steps:
determining a rated operation condition to be simulated and rated parameters;
setting the connection modes of the two three-phase transformers and the connection auxiliary equipment according to the determined rated operation condition to be simulated and rated parameters and preset rules; the two three-phase transformers have the same transformation ratio, connection group labels and capacity; the connection auxiliary equipment comprises a boosting transformer and a single-phase current source;
and adjusting the parameter setting of the connection auxiliary equipment according to a preset rule to realize operation under a rated working condition.
2. The method of claim 1, wherein:
when the rated parameter to be simulated is the rated voltage no-load operation,
correspondingly connecting the secondary side of the boosting transformer with the medium voltage sides of a three-phase transformer T1 and a three-phase transformer T2; connecting a three-phase transformer T1 and the high-voltage side of a transformer T2 in parallel, and idling the low-voltage side; the primary side of the boosting transformer is connected with a power supply;
rated voltage is supplied to the three-phase transformer T1 and the three-phase transformer T2 through the step-up transformer, and operation under no-load condition at the rated voltage is realized.
3. The method of claim 1, wherein:
when the rated parameter to be simulated is rated current and the rated operation mode to be simulated is a high-voltage rated operation mode:
correspondingly connecting the secondary side of the boosting transformer with the medium voltage sides of a three-phase transformer T1 and a three-phase transformer T2; connecting a three-phase transformer T1 and the high-voltage side of a transformer T2 in parallel, and idling the low-voltage side; the primary side of the boosting transformer is connected with a power supply;
adjusting high-voltage side tapping switches of the two three-phase transformers, and enabling the step-up transformer to supply power to the two three-phase transformers according to a preset initial voltage through a power supply;
acquiring and measuring the voltage between secondary side windings of two three-phase transformers in real time to obtain the maximum voltage difference between the secondary side windings;
calculating according to the maximum voltage difference through a preset rule to obtain maximum circulating current;
calculating a ratio K of rated current to the maximum circulating current;
and adjusting the output voltage of the step-up transformer to be K times of the initial voltage, so as to realize the operation of the high-voltage rated operation working condition of rated voltage.
4. The method according to claim 3, wherein the calculating the maximum circulating current according to the maximum voltage difference by a preset rule comprises:
calculating to obtain the maximum circulating current through a maximum voltage difference and a preset calculation formula, wherein the calculation formula is as follows:
wherein, I' is the maximum circulating current; Δ U is the maximum voltage difference;
wherein, UNIs a rated voltage; i isNRated current; e.g. of the typek1Short-circuit impedance of the three-phase transformer T1; e.g. of the typek2Is the short-circuit impedance of the three-phase transformer T2.
5. The method of claim 3, wherein: the tap switch on the high-voltage side of each three-phase transformer is provided with N gears, and 2N preset current operation working conditions are obtained by adjusting the tap switch of each three-phase transformer.
6. The method of claim 1, wherein:
when the rated parameter to be simulated is rated current and the rated operation mode to be simulated is a medium-voltage rated operation mode:
correspondingly connecting the secondary side of the boosting transformer with the medium voltage sides of a three-phase transformer T1 and a three-phase transformer T2; connecting a three-phase transformer T1 and the high-voltage side of a transformer T2 in parallel, and idling the low-voltage side; the primary side of the boosting transformer is connected with a power supply;
two ends of a single-phase current source are respectively connected with central point lead wires of medium voltage windings of two three-phase transformers; the medium voltage windings of the two three-phase transformers are in star connection; the central point lead can bear 3 times of rated current;
the output current of the single-phase current source is adjusted to be 3 times of the rated current of the medium-voltage side, and the operation of the medium-voltage rated operation condition of the rated voltage is realized.
7. A mutual load method-based transformer rated operation condition simulation realization system is characterized by comprising the following steps:
the instruction receiving unit is used for determining a rated operation condition and rated parameters to be simulated according to a user instruction;
the simulation connection unit is used for setting the connection modes of the two three-phase transformers and the connection auxiliary equipment according to a preset rule according to the determined rated operation condition to be simulated and rated parameters; the two three-phase transformers have the same transformation ratio, connection group labels and capacity; the connection auxiliary equipment comprises a boosting transformer and a single-phase current source;
and the parameter setting unit is used for adjusting the parameter setting of the connection auxiliary equipment according to a preset rule to realize the operation under a rated working condition.
8. The system of claim 7, wherein:
when the instruction receiving unit receives that the rated parameter to be simulated is rated voltage no-load operation, the simulation connecting unit correspondingly connects the secondary side of the boosting transformer with the medium-voltage sides of a three-phase transformer T1 and a three-phase transformer T2; connecting a three-phase transformer T1 and the high-voltage side of a transformer T2 in parallel, and idling the low-voltage side; the primary side of the boosting transformer is connected with a power supply;
the parameter setting unit is used for supplying rated voltage to the three-phase transformer T1 and the three-phase transformer T2 through the boosting transformer, and the operation under no-load working condition under the rated voltage is realized.
9. The system of claim 7, wherein:
when the command receiving unit receives that the rated parameter to be simulated is the rated current and the rated operation mode to be simulated is the high-voltage rated operation mode;
the analog connection unit is used for correspondingly connecting the secondary side of the boosting transformer with the medium voltage sides of a three-phase transformer T1 and a three-phase transformer T2; connecting a three-phase transformer T1 and the high-voltage side of a transformer T2 in parallel, and idling the low-voltage side; the primary side of the boosting transformer is connected with a power supply;
the analog connection unit is used for adjusting high-voltage side tapping switches of the two three-phase transformers and enabling the booster transformer to supply power to the two three-phase transformers according to preset initial voltage through a power supply;
the parameter setting unit is used for acquiring and measuring the voltage between the secondary side windings of the two three-phase transformers in real time to obtain the maximum voltage difference between the secondary side windings;
the parameter setting unit is used for calculating according to the maximum voltage difference through a preset rule to obtain maximum circulating current;
the parameter setting unit is used for calculating a ratio K of rated current to the maximum circulating current;
the parameter setting unit is used for adjusting the output voltage of the boosting transformer to be K times of the initial voltage, and the operation of the high-voltage rated operation working condition of rated voltage is realized.
10. The system of claim 9, wherein:
the parameter setting unit is used for calculating and obtaining the maximum circulating current through a maximum voltage difference and a preset calculation formula, wherein the calculation formula is as follows:
wherein, I' is the maximum circulating current; Δ U is the maximum voltage difference;
wherein, UNIs a rated voltage; i isNRated current; e.g. of the typek1Short-circuit impedance of the three-phase transformer T1; e.g. of the typek2Is the short-circuit impedance of the three-phase transformer T2.
11. The system of claim 9, wherein: the tap switch of the high-voltage side of each three-phase transformer is provided with N gears, and the parameter setting unit is used for obtaining 2N preset current operation working conditions by adjusting the tap switch of each three-phase transformer.
12. The system of claim 7, wherein:
when the command receiving unit receives that the rated parameter to be simulated is the rated current and the rated operation mode to be simulated is the medium-voltage rated operation mode:
the analog connection unit is used for correspondingly connecting the secondary side of the boosting transformer with the medium voltage sides of a three-phase transformer T1 and a three-phase transformer T2; connecting a three-phase transformer T1 and the high-voltage side of a transformer T2 in parallel, and idling the low-voltage side; the primary side of the boosting transformer is connected with a power supply;
the analog connection unit is used for respectively connecting two ends of a single-phase current source with central point leads of medium voltage windings of the two three-phase transformers; the medium voltage windings of the two three-phase transformers are in star connection; the central point lead can bear 3 times of rated current;
the parameter setting unit is used for adjusting the output current of the single-phase current source to be 3 times of the rated current of the medium-voltage side, and the operation of the medium-voltage rated operation condition of the rated voltage is realized.
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