CN111460750B - Automatic generation system and method for protection setting values of generator and transformer - Google Patents
Automatic generation system and method for protection setting values of generator and transformer Download PDFInfo
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Abstract
The invention provides a system and a method for automatically generating a set value of protection of a generator and a transformer, which can check the short-circuit capacity and the dynamic and thermal stability of primary equipment according to the maximum short-circuit current calculation, the impact current calculation, the fault current attenuation characteristic and the stable period component calculation of each node of the system in a large mode, can automatically calculate the set value of the protection of the large-sized hydraulic generator and the transformer, output the set value of protection according to a set value list format established by a device, and can check the dynamic stability and the thermal stability of the equipment and output a check result.
Description
Technical Field
The invention belongs to the technical field of relay protection of power systems, and mainly relates to an automatic generation system and method for protection setting values of a generator and a transformer.
Background
According to the requirements of unified fixed value and reporting format in the principle of six unification of relay protection design specifications, the automatic calculation and generation of the fixed value list by a computer are possible.
And carrying out checking work of relay protection setting values regularly according to the relay protection technology supervision work requirement, and carrying out checking work of equipment dynamic stability and thermal stability regularly according to system change. Because of the limitation of professional technology, the work often needs to be carried out by entrusting professional institutions to invest large funds, for example, the electric power (2017) 266 document of the Yunnan industrial letter entrusted with electric power requires that the setting calculation work of the protection setting value of the generator and the transformer is carried out by entrusting the related test institute, and the charging is hundreds of thousands of yuan per station.
Disclosure of Invention
In order to solve the defects in the prior art, the inventor provides a system and a method for automatically generating a protection setting value of a generator and a transformer through research and development, which can automatically calculate the protection setting value of a large-sized hydraulic generator and the transformer, output a protection setting value list according to a setting value list format established by a device, and simultaneously check the dynamic stability and the thermal stability of equipment, output a checking result and solve the problems of setting value calculation and equipment short-circuit capacity check of the generator and the transformer protection device of a power plant.
Specifically, the invention is realized as follows:
an automatic generation system for protection setting values of a generator and a transformer comprises:
the equipment parameter input and equivalent impedance generation module is used for inputting original parameter information of the power system equipment, carrying out input format establishment and conversion of a reference value, protecting the conventional value of the device, and protecting the field debugging and test actual measurement value; calculating the equivalent impedance and per unit value of the system; simplifying and calculating a system fault network diagram according to the type of the power system fault, and calculating an equivalent network diagram of each sequence; obtaining test value information of power system equipment test;
the short circuit calculation and setting value calculation module is used for carrying out short circuit capacity calculation, checking and protection setting calculation on the power system equipment, and carrying out setting calculation on the relay protection of the general large-scale generator and the transformer according to the protection principle through maximum short circuit current calculation, impact current calculation, fault current attenuation characteristic and stable period component calculation of each node of the power system equipment in a large mode; and is used for checking whether the dynamic stability, thermal stability of the primary equipment, the short-circuit capacity of the switch and the overload capacity of the equipment meet the requirements according to the calculation result, and obtaining the calculation value of the short-circuit capacity and the setting value;
the setting value rationality examination module is used for examining the rationality of the setting values one by one according to the short circuit calculation result, the actual measurement parameters of the on-site debugging test of the power system equipment, the technical requirements of equipment manufacturers and the on-site operation requirements, and finally determining the setting values;
and the setting value list generation and output module is used for compiling a setting value notification list of the generator and the transformer protection, which accords with the field reality, according to the short circuit calculation result and the setting value after examination and setting according to the prefabricated setting value list format, and automatically linking the setting parameters to the setting value addresses after examination and setting one by one to generate the setting value notification list.
Further, the constant value list generating and outputting module further includes:
according to the design specification requirements of unified functional configuration, unified loop design, unified terminal row arrangement, unified interface standard, unified screen cabinet pressing plate, unified protection fixed value and unified report format, the setting value of the protection device and the establishment of a typical protection device fixed value list are generated.
Furthermore, the short circuit calculation and setting value calculation module further comprises the step of checking the short circuit capacity, the dynamic stability and the thermal stability of the primary power system equipment according to the maximum short circuit current calculation, the impact current calculation, the fault current attenuation characteristic and the stable period component calculation of each node of the system in a large mode.
Further, the calculation of the equivalent impedance and per unit value of the power system equipment comprises calculation of parameters of all elements of a main wiring diagram and an equivalent impedance diagram of a power station generator and a transformer connected with the system, and the simplified equivalent impedance diagram of the power system equipment is obtained.
Further, the power system fault type and fault network diagram simplification and calculation comprise three-phase short circuit, two-phase short circuit and single-phase earth fault positive sequence, negative sequence and zero sequence equivalent network diagram calculation of each node in a large mode and a small mode; and calculating fault current and fault voltage of each node in the large mode and the small mode of the power system, wherein the three-phase short circuit, the two-phase short circuit and the single-phase grounding occur.
Further, the test value information of the electric power system equipment test comprises conventional system parameter settings of a generator and a transformer protection device, field protection debugging test parameters, actual test values of field primary equipment parameters, equipment manufacturer technology and field operation requirement values.
In another aspect of the invention, an automatic generation method for protection setting values of a generator and a transformer is provided, which comprises the following steps:
s1, inputting original parameters of power system equipment and power plant equipment, conventional values of a protection device, debugging and testing actual measurement values of a protection site, and carrying out input format establishment and conversion of a reference value to obtain a setting calculation original parameter table;
s2, calculating the equivalent impedance or per unit value of the system; simplifying and calculating a system fault network diagram according to the type of the power system fault, and calculating an equivalent network diagram of each sequence; obtaining the fault quantity required by power system fault calculation and fault analysis;
s3, acquiring parameters in the steps S1 and S2, and according to the protection function principles of the generator and the transformer, performing protection setting value setting calculation on each protection function based on a corresponding parameter calculation method and a corresponding set intermediate variable to obtain a determined setting value;
s4, based on the setting value in the S3, the actual operation requirement of the power system equipment is combined, and a corresponding setting value notification bill is compiled and output.
Further, the power system equipment parameters, the power plant equipment parameters, the protection device conventional values, the protection field debugging and test actual measurement values comprise: the system comprises one or more relay protection system setting parameters of power equipment, wherein the relay protection system setting parameters comprise system equivalent parameters, engine basic parameters, main transformer basic parameters, reactor basic parameters, excitation variable parameters, high factory variable parameters, public variable parameters, lighting variable parameters, dam top variable parameters, maintenance variable parameters, equipment library variable parameters, camp variable parameters and factory diesel oil variable parameters.
Further, the power system fault type simplifies and calculates a system fault network diagram, calculates each sequence of equivalent network diagrams, and includes: generating one or more of a system equivalent diagram, main transformer resistance calculation, calculation of standard value converted from each element to a reference regulation, generation of a system equivalent resistance diagram and calculation of fault current of each generator when various faults occur.
The protection fixed value and report format unification requires that each protection device manufacturer unifies the protection fixed value and the report format according to a standard format, and creates conditions for field operation maintenance standardization.
The invention adopts the further technical proposal for solving other technical problems: and checking the short-circuit capacity, the dynamic stability and the thermal stability of the primary equipment according to the maximum short-circuit current calculation, the impact current calculation, the fault current attenuation characteristic and the stable period component calculation of each node of the system in a large mode.
The invention has the beneficial effects that: the computer based on Excel form programming and development automatically calculates the protection setting values of the large-sized hydraulic generator and the transformer, outputs a protection setting value list according to a setting value list format established by the device, can check the dynamic stability and the thermal stability of equipment, outputs a check result, solves the problems of setting value calculation of the protection device of the generator and the transformer and the short-circuit capacity calculation of the equipment of a power plant, the system has set value setting work for WFB-800 type generators and transformer protection devices of the Dragon opening company, and check the short circuit capacity of primary system equipment of the Dragon opening hydropower station, thus saving technical consultation cost by 120 tens of thousands yuan for 2019 of the Dragon opening company. Has extremely high popularization value in hydropower stations. Without the need to install or add any other software. The technology is suitable for power technicians with general expertise, and special technical requirements are not needed. The technology has strong popularization and wide application and development, and can be popularized in the power generator, transformer protection setting calculation, power system fault analysis, power flow calculation and the like of a thermal power plant.
Drawings
FIG. 1 is a schematic diagram of a system for automatically generating protection setting values of a generator and a transformer;
FIG. 2 is a schematic diagram of steps of a method for automatically generating protection setting values of a generator and a transformer;
FIG. 3 is a system parameter and power plant parameters representing intent;
FIG. 4 is a main wiring diagram under original parameters;
FIG. 5 is a diagram of the equivalent impedance of the system at a selected reference value in example 2;
FIG. 6 is a simplified graph of the calculated impedance of the periodic component of the three-phase short circuit at the K1 point in the large scale mode of example 2;
FIG. 7 is a simplified graph of the calculated impedance of the K1 point three-phase short-circuit sub-transient in the large mode of example 2;
FIG. 8 is a simplified graph of the calculated impedance of the transient component of the three-phase short circuit at the K1 point in example 2;
FIG. 9 is a graph showing the attenuation of the K1 point three-phase fault current with time in example 2;
FIG. 10 is a diagram showing the field-loss protection operation impedance circle of embodiment 2;
FIG. 11 is a drop-out impedance garden for the water wheel generator of example 2;
FIG. 12 is a single page view of WFB-801A/F generator protector settings;
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
Noun interpretation mentioned in this example:
the original parameter information of the power system equipment refers to: line impedance, generator synchronous reactance, transient and sub-transient reactance, transformer short circuit impedance, etc.
The actual test values of the protection field debugging and test are as follows: the protection operation test needs to be performed on system parameters such as generator and transformer neutral point voltage, differential protection unbalanced current and the like in the running of the unit.
Power system fault types, including which: three-phase short circuit fault, two-phase short circuit fault, single-phase grounding fault, line disconnection phase failure and other faults.
Simplified and calculated, and each equivalent network diagram calculation, "simplified" in the description means: "each order" means: the simplification is to gradually simplify the complex system impedance diagram into equivalent impedance circuit diagram in the power system fault calculation process, and each sequence refers to positive sequence impedance, negative sequence impedance and zero sequence impedance (technical term)
Experimental test value information, including which: the conventional convention refers to parameters such as 100V device voltage, 1A or 5A point current, etc., test values such as neutral point voltage, differential protection unbalanced current, etc.
The original parameters of the power system equipment and the power plant equipment refer to: original parameter information of equipment in same power system
The fault quantity required by the fault calculation and the fault analysis of the power system is as follows: short-circuit current (maximum short-circuit current, zero-sequence current, negative-sequence current, etc.), zero-sequence voltage, etc.;
parameters in the steps S1 and S2 are obtained, and according to the protection function principles of the generator and the transformer, based on a corresponding parameter calculation method and a corresponding set intermediate variable, protection fixed value setting calculation is carried out on each protection function, so as to obtain a determined setting value; wherein: the protection function principle of the generator and the transformer specifically refers to a relay protection function configured according to different fault types, and different manufacturers can realize the protection function by utilizing different principles, such as the grounding protection of a generator stator, and the protection principle comprises 'injection signal type stator grounding protection' and 'stator grounding protection consisting of fundamental wave zero sequence voltage and third harmonic'; the protection function corresponding to different principles has specific setting parameters and calculation methods, and the intermediate variables refer to some parameter storage addresses in the calculation process of the system.
Example 1: all calculation functions such as fault analysis calculation, protection setting calculation and the like of the power system are programmed, automatically perform related calculation and comparison to obtain a result, and a fixed value list is output through a pre-prepared fixed value list format.
The setting value automatic calculation system comprises an equipment parameter input and equivalent impedance generation module; a general contract and test value module; a short circuit calculation and setting value calculation module; setting value rationality examination module; and generating and printing out the fixed value list.
The equipment parameter input and equivalent impedance generation module comprises original equipment parameter input formatting, system equivalent impedance (per unit value) calculation, system fault network diagram simplification and calculation according to the power system fault type, and each sequence equivalent network diagram calculation.
The general convention and test value module comprises a generator, conventional system parameter setting of a transformer protection device, field protection debugging test parameters, actual test values of field primary equipment parameters and technical requirement values of equipment manufacturers.
The short circuit calculation and setting value calculation module comprises power equipment short circuit capacity calculation and check and protection setting calculation, and comprises maximum short circuit current calculation, impact current calculation, fault current attenuation characteristic and stable period component calculation of each node of a system in a large mode, and general large-scale generator and transformer relay protection setting calculation according to DL/T684-2012, large-scale generator and generator set protection setting technical specifications of a large-scale generator of a south power grid, relay protection setting calculation rules of a large-scale generator of a south power grid, factory power relay protection setting calculation rules of DL T1502-2016, technical specifications of device manufacturers and field operation requirements.
The setting value rationality examination module examines and sets the automatic calculation recommended result one by one according to the actual measurement parameters of the field debugging test of the protection device, the field primary equipment parameter production short-circuit test, the boosting test, the temperature rise test, the grid-connected test and the like, the technical requirement values of equipment manufacturers and fully considering the reliability, the rapidity, the sensitivity, the selectivity and the field operation requirement of the relay protection device.
The fixed value list generation and output module comprises a fixed value list format of the generator and transformer protection device designed according to the six-unified design specification requirement, a generator and transformer protection setting value notification list conforming to the field reality is compiled, all setting parameters are automatically linked to the checked and set fixed value addresses one by one, and finally the setting value notification list is generated.
Example 2: a large-scale hydraulic generator and transformer protection setting value computing system based on Excel development is shown in figure 1, and comprises an equipment parameter input and equivalent impedance generation module; a general contract and test value module; a short circuit calculation and setting value calculation module; setting value rationality examination module; and generating and outputting a constant value list.
Taking the setting process of the setting values of the generators and the transformer protection devices of Dragon opening company # 1-5 as an example, a specific implementation method is described.
(1) And the equipment parameter input and equivalent impedance generation module is as follows:
step S1, according to the system parameters and the power plant equipment parameters, a system parameter table is compiled, and complete parameters are input, wherein the parameter table is shown in figure 3,
step S2, selecting proper per unit values according to system parameters, converting all parameters into the per unit values under the selected reference values, and obtaining an equivalent system impedance diagram as shown in fig. 4; wherein the setting of the short circuit calculation is as follows
The calculation method comprises the following steps: a calculation formula is compiled, and data in the formula are all linked from a device parameter table:
such as main transformer impedance calculation: xt=e54/100×b34/C54, where C54 refers to the parameter from the device ≡! C36 E54 references the self-device parameters-! C41 And B34 is the reference capacity.
The individual elements are converted into standard values under standard conditions:
the system equivalent impedance diagram is shown in figure 5,
and step S3, calculating fault current and voltage of each device (fault point) (taking K1 point three-phase short-circuit fault as an example). The calculation of the data in the graph requires basic electrical knowledge, the equivalent impedance graph has been simplified,
the calculation of the fault current periodic component when the K1 point is in three-phase short circuit fault is carried out, an equivalent diagram in a large mode is shown in fig. 6, and the calculation result of the equivalent impedance is shown in the following table:
fault current period component of each unit:
I KG ＝12.2870kA
the calculation of the non-periodic component (secondary transient component) of the fault current of each generator when the three phases of the high-voltage side of the main transformer at the K1 point are short-circuited, an equivalent diagram of the mode of replacing Xd with Xd' is shown in fig. 7, and the calculation of equivalent impedance is as follows:
the non-periodic component (sub-transient component) of the fault current of each unit is:
I KGaper ＝34.9407
the calculation of the non-periodic component (transient component) of the fault current of each generator when the three phases of the high-voltage side of the main transformer at the K1 point are short-circuited, an equivalent diagram of the mode of replacing Xd with Xd' is shown in fig. 8, and the calculation of equivalent impedance is as follows:
the fault current non-periodic component (transient component) of each unit is as follows:
I′ KGaper ＝28.9490KA
D. the generator 1G supplies the short-circuit full current formula:
the formula consists of an exponential function, a trigonometric function, etc., known as (T a ＝0.44；T′ a ＝2.12；T″ a =0.12), when t=0.01 s according to the maximum value principle, the short-circuit current reaches the maximum value (peak): the calculation process can be divided into a plurality of functions, i=f (t) is finally taken, and a fault current and time attenuation chart (the chart is the current in the initial stage of the fault, the fault 1s and the vicinity of the fault 2 s) can be calculated and drawnAnd can check whether the short-circuit capability of the switching device meets the requirement, and can set the latching tripping current of the switch.
A decay graph of fault current versus time is obtained as shown in fig. 9.
And S4, performing protection setting calculation (for example, generator loss magnetic protection setting impedance circle setting calculation) according to the protection function principle of the generator and the transformer.
According to the requirements of DL/T684-2012, namely the rules of large-scale generator transformer relay protection setting calculation, the technical specifications of large-scale generator and generator set protection setting of the south electric network, and the rules of large-scale generator transformer relay protection setting calculation of the south electric network, a parameter calculation formula is compiled, and relevant parameter addresses are quoted in the parameter table and fault calculation (setting calculation) process, so that a fixed value result is automatically calculated. ( For some calculation results, it is often necessary to determine optimal parameters according to field tests, and then determine setting values. The works have fixed value auditing and judging, and parameters are selected according to the requirements of the 'guide rules' and the technical specifications of manufacturers. )
=calculation procedure-! J155 device parameters-! C6 device parameters ≡! C6/device parameters-! C4 device parameters ≡! C28/device parameters-! C32C 32
Note that: all calculated data in the formula is derived from the numerical address in the device parameter input and equivalent impedance generation module. And similarly, setting other fixed values.
Stator impedance criteria: asynchronous boundary impedance relay tuning. The asynchronous boundary impedance circle action criterion is mainly used for detecting the loss of magnetic field fault of the generator closely connected with the system, and can reflect the final impedance of the machine end of the loss of magnetic field generator, but the action can be late.
The asynchronous circle formula is as follows:
the quiet circle formula is as follows:
= 15.46 (=calculation procedure | J155. Device parameters | C6/device parameters | C4. Device parameters | C28/device parameters | C32)
Xcon is equal to system minimum reactance X of system reduced to main transformer high-voltage side bus of power plant S.min (informed by the dispatch center, corresponding to the maximum mode of operation).
Reactive reverse fixed value (reactive setting according to allowable phase advance operation under the rated active condition of the generator when being matched with static limit impedance)
Q＝K rel ·Q jx ＝1.3*Q jx ＝44.7
In order to prevent malfunction and malfunction, the following general settings are set:
Q＝5％·Q gn ＝0.05*Q gn ＝2.42
the asynchronous circle and the static circle are shown in fig. 10, wherein the circle 1 is an asynchronous circle (the system is tightly connected), the circle 2 is a static limit circle of the steam turbine generator, and the straight line 3 is reactive reverse;
the hydro-generator loses the droplet impedance circle as shown in fig. 11.
And compiling a protection device fixed value list format.
And according to the six unified specification requirements of relay protection design, combining the actual device to compile a fixed value list format. (hereinafter, the system parameters of the Longkou company and the power plant parameters represent the intents), as shown in FIG. 12;
and establishing parameter links of each element according to the fixed value format. If the fixed value of the fixed value 3.4 ratio brake coefficient is linked from "= 'D: \relay protection setting calculation system 1\Dragon open power plant short circuit current calculation 2019.Xls ] generator zero sequence differential protection setting' +|! $N$7). After all fixed value parameter links are established, automatically opening the setting calculation result links and outputting fixed value sheets.
The check of the fixed value sheet is performed to check the rationality of each fixed value, and the check is mainly performed to check the coordination of backup protection and other protection and the compliance of operation requirements, so that a certain professional basis is required.
And after checking the fixed value sheet, performing electronic signature to print the fixed value sheet.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the present invention and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present invention.
Claims (7)
1. An automatic generation system for protection setting values of a generator and a transformer, which is characterized by comprising the following components:
the equipment parameter input and equivalent impedance generation module is used for inputting original parameter information of the power system equipment, carrying out input format establishment and conversion of a reference value, protecting the conventional value of the device, and protecting the field debugging and test actual measurement value; calculating the equivalent impedance and per unit value of the system; simplifying and calculating a system fault network diagram according to the type of the power system fault, and calculating an equivalent network diagram of each sequence; obtaining test value information of power system equipment test; the power system equipment test value information comprises conventional system parameter settings of a generator and a transformer protection device, field protection debugging test parameters, actual test values of field primary equipment parameters, equipment manufacturer technology and field operation requirement values;
the short circuit calculation and setting value calculation module is used for carrying out short circuit capacity calculation, checking and protection setting calculation on the power system equipment, and carrying out setting calculation on the relay protection of the general large-scale generator and the transformer according to the protection principle through maximum short circuit current calculation, impact current calculation, fault current attenuation characteristic and stable period component calculation of each node of the power system equipment in a large mode; and is used for checking whether the dynamic stability, thermal stability of the primary equipment, the short-circuit capacity of the switch and the overload capacity of the equipment meet the requirements according to the calculation result, and obtaining the calculation value of the short-circuit capacity and the setting value;
the setting value rationality examination module is used for examining the rationality of the setting values one by one according to the short circuit calculation result, the actual measurement parameters of the on-site debugging test of the power system equipment, the technical requirements of equipment manufacturers and the on-site operation requirements, and finally determining the setting values;
and the setting value list generation and output module is used for compiling a setting value notification list of the generator and the transformer protection, which accords with the field reality, according to the short circuit calculation result and the setting value after examination and setting according to the prefabricated setting value list format, and automatically linking the setting parameters to the setting value addresses after examination and setting one by one to generate the setting value notification list.
2. The automatic generation system of a protection setting value of a generator and a transformer according to claim 1, wherein the setting value list generation and output module further comprises:
according to the design specification requirements of unified functional configuration, unified loop design, unified terminal row arrangement, unified interface standard, unified screen cabinet pressing plate, unified protection fixed value and unified report format, the setting value of the protection device and the establishment of a typical protection device fixed value list are generated.
3. The automatic generation system of the protection setting values of the generator and the transformer according to claim 1, wherein the calculation of the equivalent impedance and the per unit value of the power system equipment comprises the calculation of parameters of each element of a main wiring diagram and an equivalent impedance diagram of the generator and the transformer of the power station connected with the system, and the simplified equivalent impedance diagram of the power system equipment is obtained.
4. The system for automatically generating the protection setting values of the generator and the transformer according to claim 1, wherein the power system fault type and the fault network diagram are simplified and calculated, and the system comprises three-phase short circuit, two-phase short circuit and single-phase earth fault positive sequence, negative sequence and zero sequence equivalent network diagram calculation of each node in a large mode and a small mode; and calculating fault current and fault voltage of each node in the large mode and the small mode of the power system, wherein the three-phase short circuit, the two-phase short circuit and the single-phase grounding occur.
5. The automatic generation method of the protection setting value of the generator and the transformer is characterized by comprising the following steps of:
s1, inputting original parameters of power system equipment and power plant equipment, conventional values of a protection device, debugging and testing actual measurement values of a protection site, and carrying out input format establishment and conversion of a reference value to obtain a setting calculation original parameter table;
s2, calculating the equivalent impedance or per unit value of the system; simplifying and calculating a system fault network diagram according to the type of the power system fault, and calculating an equivalent network diagram of each sequence; obtaining the fault quantity required by power system fault calculation and fault analysis;
s3, acquiring parameters in the steps S1 and S2, and according to the protection function principles of the generator and the transformer, performing protection setting value setting calculation on each protection function based on a corresponding parameter calculation method and a corresponding set intermediate variable to obtain a determined setting value;
s4, based on the setting value in the S3, the actual operation requirement of the power system equipment is combined, and a corresponding setting value notification bill is compiled and output.
6. The method for automatically generating the protection setting values of the generator and the transformer according to claim 5, wherein the power system equipment parameters, the power plant equipment parameters, the protection device conventional values, the protection field debugging and test actual measurement values comprise: the system comprises one or more relay protection system setting parameters of power equipment, wherein the relay protection system setting parameters comprise system equivalent parameters, engine basic parameters, main transformer basic parameters, reactor basic parameters, excitation variable parameters, high factory variable parameters, public variable parameters, lighting variable parameters, dam top variable parameters, maintenance variable parameters, equipment library variable parameters, camp variable parameters and factory diesel oil variable parameters.
7. The method for automatically generating the protection setting values of the generator and the transformer according to claim 5, wherein the power system fault type is calculated by simplifying and calculating a system fault network diagram and calculating an equivalent network diagram of each sequence, and the method comprises the following steps: generating one or more of a system equivalent diagram, main transformer resistance calculation, calculation of standard value converted from each element to a reference regulation, generation of a system equivalent resistance diagram and calculation of fault current of each generator when various faults occur.
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| CN112464416B (en) * | 2020-11-13 | 2023-05-30 | 国网山东省电力公司青岛供电公司 | Method and system for generating all-station fixed value of one-key transformer substation |
| CN114204514B (en) * | 2021-11-23 | 2024-04-26 | 中国南方电网有限责任公司 | Processing method of special operation mode of power grid for relay protection |
| CN116706840B (en) * | 2023-08-01 | 2023-10-13 | 云南电网有限责任公司 | Power plant network-related loss of magnetic protection fixed value checking and optimizing method and system |
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