CN112928817A - Power distribution terminal operation data management system - Google Patents

Power distribution terminal operation data management system Download PDF

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Publication number
CN112928817A
CN112928817A CN202011309546.7A CN202011309546A CN112928817A CN 112928817 A CN112928817 A CN 112928817A CN 202011309546 A CN202011309546 A CN 202011309546A CN 112928817 A CN112928817 A CN 112928817A
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data
power distribution
distribution equipment
data management
management system
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佘开旋
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Nanjing Youshang Culture Communication Co ltd
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Nanjing Youshang Culture Communication Co ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00001Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for

Abstract

The invention discloses a power distribution terminal operation data management system, which has the technical scheme key points that: distribution terminal operation data management system, including data acquisition module, mobile terminal, intelligent terminal, control module and data management module, data acquisition module with mobile terminal communication connection, intelligent terminal with mobile terminal communication connection, control module with control module is connected, data management module with control module is connected, and among this distribution terminal operation data management system, the mobile terminal volume that is equipped with is less, carries when being convenient for cross-region doing business, is convenient for automatic identification various distribution equipment to current distribution equipment of quick accurate discernment location, be convenient for classify the arrangement according to different kinds of information to distribution equipment data, improve the efficiency of arrangement, be suitable for the dynamic characteristic of all kinds of partial differential equation description systems through distribution parameter model.

Description

Power distribution terminal operation data management system
Technical Field
The invention relates to the technical field of power equipment, in particular to a power distribution terminal operation data management system.
Background
The power grid in China has the characteristics of multiple points, wide range, complex voltage grade, more cross spans, wide exposure of power transformation and distribution facilities to population focus areas, low protection grade and the like. The electric power operation generally has the characteristics of scattered operation, few operators, more temporary work, small operation difficulty, low voltage level and the like. In the aspect of data management, unified management and standard management are not facilitated, and the realization of standardized management is an important basis for realizing scientific management of enterprises. Therefore, the management of the operation data of the power distribution terminal is enhanced, a standardized operation method is implemented, and the control of the whole process of the operation is an important measure for the management of the operation data of the power distribution terminal.
For example, chinese patent No. CN107070969A discloses a system and method for managing data in a power distribution room, the system includes: the system comprises a middleware, a service system and a data acquisition system; the data acquisition system is connected with the plurality of power distribution rooms and is used for acquiring the operation data of the plurality of power distribution rooms; the middleware is connected with the data acquisition system and used for acquiring the operation data acquired by the data acquisition system, performing compatible processing on the operation data in various formats, converting the operation data into a set format, and sending the converted data to the service system for storage, wherein the conversion into the set format comprises: and converting each parameter and the corresponding parameter value in the operating data acquired by the data acquisition system into an index and a corresponding index value respectively.
The data management system has the advantages of improving management efficiency; however, the data management system described above still has some disadvantages, such as: the cross-regional power distribution data management is inconvenient, different types of power distribution equipment cannot be classified, data can be distinguished, and the data cannot be analyzed and processed through a distributed parameter and centralized parameter model.
Disclosure of Invention
The present invention is directed to a power distribution terminal operation data management system to solve the problems set forth in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
the power distribution terminal operation data management system comprises a data acquisition module, a mobile terminal, an intelligent terminal, a control module and a data management module, wherein the data acquisition module is in communication connection with the mobile terminal, the intelligent terminal is in communication connection with the mobile terminal, the control module is connected with the control module, and the data management module is connected with the control module;
the mobile terminal is used for automatically identifying various power distribution equipment, identifying a target object, acquiring related data and quickly and accurately identifying and positioning the current power distribution equipment;
the data acquisition module is used for acquiring the operating data of various formats of various power distribution equipment;
the intelligent terminal is used for processing the data acquired by the data acquisition module to classify the data, classifying the data according to different types of power distribution equipment and distinguishing the data;
the control module is used for assisting in data analysis and processing by adopting a distributed parameter and centralized parameter model, determining the accuracy of data and controlling and detecting the running state of the power distribution equipment;
the data management module is used for converting formats of all data into a uniform format, generating a data information coding value and storing the data with the uniform format.
Preferably, the mobile terminal is one of a mobile phone, a notebook computer and a tablet personal computer, and a GPS coordinate bit unit is arranged in the mobile terminal and used for positioning equipment.
Preferably, the data acquisition module comprises an RFID electronic tag identification unit and a bar code identification unit, and performs effective data identification modes according to different power distribution equipment, and the RFID electronic tag identification unit and the bar code identification unit are used for acquiring information, operating parameters and operating time data of the power distribution equipment.
Preferably, the intelligent terminal comprises a data receiving unit, a data sorting and classifying unit and a data sending unit, the data receiving unit is used for receiving the power distribution equipment data collected by the data collecting module, the data sorting and classifying unit sorts and classifies all the data according to different types of information and then packages the data, and the data sending unit sends the packaged data.
Preferably, the control module comprises a central processing unit and a display, the central processing unit determines the accuracy of the data by comparing with original parameters of the equipment, and the display is used for observing the operation condition when monitoring each power distribution equipment.
Preferably, the central processing unit is internally provided with an automatic detection module, the automatic detection module performs automatic data detection on monitoring points of the power distribution equipment at preset intervals, sends detection results to the central processing unit for data analysis, and determines abnormal voltage and current data of the power distribution equipment.
Preferably, the data management module includes a data conversion unit and a data storage unit, the data conversion unit converts data in different formats into a uniform format, and the data storage unit is used for storing parameter data of power distribution equipment in the uniform format.
Preferably, the method for generating the data information code value comprises:
a. defining the encoded value En of the data information as a quaternion array: en ═ m (Ms, Mf, Ma, Mr), where Ms characterizes the classification system constituent code value of the data information, Mf characterizes the plane table constituent code value of the data information, Ma characterizes the structure table constituent code value of the data information, and Mr characterizes the pipelined code of the data information;
b. and respectively determining the sub-coding values represented by Ms, Mf and Ma, filling a quaternion array, performing linear analysis to obtain the required sub-coding values, filling a pipelined code Mr, finally forming a coding value of the data information, and verifying the generated data information coding to ensure the accuracy of the coding data.
Preferably, the data storage unit is provided with an encoding value retrieval subunit, and the encoding value retrieval subunit is configured to retrieve the power distribution equipment information parameters in the database in the data storage unit.
Preferably, the voltage and current abnormal data detection and calculation formula of the power distribution equipment is as follows:
voltage loss calculation formula:
Figure BDA0002789314900000031
Figure BDA0002789314900000032
Δu%=0.13%<5%
and when the voltage is less than 5 percent, the voltage loss requirement is met.
Short circuit calculation:
short-circuit protection: in the physical process of three-phase short circuit in an infinite large-capacity power system, three-phase short circuit current is a periodic component plus a non-periodic component.
Namely: when the time goes to infinity, the aperiodic component goes to zero.
Namely:
when u is 0, the periodic component of the short-circuit current:
Figure BDA0002789314900000041
Figure BDA0002789314900000042
when t is 0:
Figure BDA0002789314900000043
i 'is the effective value of short-circuit sub-transient current, I' ═ I=Ik
Non-periodic component of short circuit current:
Figure RE-GDA0003027142680000044
Figure RE-GDA0003027142680000045
the degree of the magnetic field is measured,
Figure RE-GDA0003027142680000046
therefore, it is
Figure RE-GDA0003027142680000047
Therefore, it is
Figure BDA0002789314900000046
Short-circuit full current: i.e. ik=ip+inp(ii) a Instantaneous total current effective value:
Figure BDA0002789314900000047
short-circuit impact current:
Figure BDA0002789314900000048
Figure BDA0002789314900000049
or
Figure BDA00027893149000000410
When the high-voltage circuit is in three-phase short circuit: ksh=1.8· ish=2.55I Ish=1.51I
Low voltage 1000KV A and below Ksh=1.3 ish=1.84I Ish=1.09I
Compared with the prior art, the invention has the beneficial effects that:
in this distribution terminal operation data management system, the mobile terminal volume that is equipped with is less, be convenient for carry when doing business transregionally, be convenient for the automatic identification various distribution equipment, discernment target object and acquisition relevant data, and quick accurate discernment location current distribution equipment, be convenient for classify the arrangement according to different types of information to distribution equipment data through intelligent terminal, then pack, send and receive, improve the efficiency of arrangement, the control module that is equipped with is convenient for be suitable for the dynamic characteristic of all kinds of partial differential equation description systems through the distribution parameter model, describe the dynamic characteristic of system with linear or nonlinear ordinary differential equation through concentrating the parameter model, confirm the accuracy of data and control and detect distribution equipment's running state.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a block flow diagram of the present invention;
FIG. 3 is a signal circuit diagram of a data acquisition module of the present invention;
FIG. 4 is a circuit diagram of a data acquisition module according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The power distribution terminal operation data management system comprises a data acquisition module, a mobile terminal, an intelligent terminal, a control module and a data management module, wherein the data acquisition module is in communication connection with the mobile terminal, the intelligent terminal is in communication connection with the mobile terminal, the control module is connected with the control module, and the data management module is connected with the control module;
the mobile terminal is used for automatically identifying various power distribution equipment, identifying a target object, acquiring related data and quickly and accurately identifying and positioning the current power distribution equipment;
the data acquisition module is used for acquiring the operating data of various formats of various power distribution equipment;
the intelligent terminal is used for processing the data acquired by the data acquisition module to classify the data, classifying the data according to different types of power distribution equipment and distinguishing the data;
the control module is used for assisting in data analysis and processing by adopting a distributed parameter and centralized parameter model, determining the accuracy of data and controlling and detecting the running state of the power distribution equipment;
the data management module is used for converting the formats of all the data into a uniform format, generating a data information coding value and storing the data with the uniform format.
In this embodiment, preferably, the mobile terminal is one of a mobile phone, a notebook computer and a tablet computer, and a GPS coordinate bit unit is arranged in the mobile terminal and used for positioning the device.
In this embodiment, preferably, the data acquisition module includes an RFID tag identification unit and a barcode identification unit, and performs an effective data identification mode according to different power distribution devices, where the RFID tag identification unit and the barcode identification unit are both used to acquire power distribution device information, operating parameters, and operating time data.
In this embodiment, preferably, the intelligent terminal includes a data receiving unit, a data sorting and classifying unit, and a data sending unit, the data receiving unit is configured to receive the distribution equipment data collected by the data collection module, the data sorting and classifying unit sorts and classifies all the data according to different types of information, and then packages the data, and the data sending unit sends the packaged data.
In this embodiment, preferably, the control module includes a central processing unit and a display, the central processing unit determines the accuracy of the data by comparing with the original parameters of the equipment, and the display is used for observing the operation status when monitoring each power distribution equipment.
In this embodiment, preferably, an automatic detection module is disposed in the central processing unit, and the automatic detection module performs data automatic detection on the monitoring points of the power distribution equipment at preset intervals, and sends the detection result to the central processing unit for data analysis, so as to determine abnormal voltage and current data of the power distribution equipment.
In this embodiment, preferably, the data management module includes a data conversion unit and a data storage unit, the data conversion unit converts data in different formats into data in a uniform format, and the data storage unit is configured to store parameter data of the power distribution equipment in the uniform format.
In this embodiment, preferably, the method for generating the data information code value includes:
a. defining the encoded value En of the data information as a quaternion array: en ═ m (Ms, Mf, Ma, Mr), where Ms characterizes the classification system constituent code value of the data information, Mf characterizes the plane table constituent code value of the data information, Ma characterizes the structure table constituent code value of the data information, and Mr characterizes the pipelined code of the data information;
b. and respectively determining the sub-coding values represented by Ms, Mf and Ma, filling a quaternion array, performing linear analysis to obtain the required sub-coding values, filling a pipelined code Mr, finally forming a coding value of the data information, and verifying the generated data information coding to ensure the accuracy of the coding data.
In this embodiment, preferably, the data storage unit is provided with an encoding value retrieval subunit, and the encoding value retrieval subunit is configured to retrieve the power distribution equipment information parameters in the database in the data storage unit.
In this embodiment, preferably, the voltage and current anomaly data detection calculation formula of the power distribution device is as follows:
voltage loss calculation formula:
Figure BDA0002789314900000071
Figure BDA0002789314900000072
Δu%=0.13%<5%
and when the voltage is less than 5 percent, the voltage loss requirement is met.
Short circuit calculation:
short-circuit protection: in the physical process of three-phase short circuit in an infinite large-capacity power system, three-phase short circuit current is a periodic component plus a non-periodic component.
Namely: when the time goes to infinity, the aperiodic component goes to zero.
Namely:
when u is 0, the periodic component of the short-circuit current:
Figure BDA0002789314900000081
Figure BDA0002789314900000082
when t is 0:
Figure BDA0002789314900000083
i 'is the effective value of short-circuit sub-transient current, I' ═ I=Ik
Non-periodic component of short circuit current:
Figure RE-GDA0003027142680000081
Figure RE-GDA0003027142680000082
the degree of the magnetic field is measured,
Figure RE-GDA0003027142680000083
therefore, it is
Figure RE-GDA0003027142680000084
Therefore, it is
Figure BDA0002789314900000086
Short-circuit full current: i.e. ik=ip+inp(ii) a Instantaneous total current effective value:
Figure BDA0002789314900000087
short-circuit impact current:
Figure BDA0002789314900000088
Figure BDA0002789314900000089
or
Figure BDA00027893149000000810
When the high-voltage circuit is in three-phase short circuit: ksh=1.8· ish=2.55I Ish=1.51I
Low voltage 1000KV A and below Ksh=1.3 ish=1.84I Ish=1.09I
Example 2
The power distribution terminal operation data management system comprises a data acquisition module, a mobile terminal, an intelligent terminal, a control module and a data management module, wherein the data acquisition module is in communication connection with the mobile terminal, the intelligent terminal is in communication connection with the mobile terminal, the control module is connected with the control module, and the data management module is connected with the control module;
the mobile terminal is used for automatically identifying various power distribution equipment, identifying a target object, acquiring related data and quickly and accurately identifying and positioning the current power distribution equipment;
the data acquisition module is used for acquiring the operating data of various formats of various power distribution equipment;
the intelligent terminal is used for processing the data acquired by the data acquisition module to classify the data, classifying the data according to different types of power distribution equipment and distinguishing the data;
the control module is used for assisting in data analysis and processing by adopting a distributed parameter and centralized parameter model, determining the accuracy of data and controlling and detecting the running state of the power distribution equipment;
the data management module is used for converting the formats of all the data into a uniform format, generating a data information coding value and storing the data with the uniform format.
In this embodiment, preferably, the mobile terminal is one of a mobile phone, a notebook computer and a tablet computer, and a GPS coordinate bit unit is arranged in the mobile terminal and used for positioning the device.
In this embodiment, preferably, the data acquisition module includes an RFID tag identification unit and a barcode identification unit, and performs an effective data identification mode according to different power distribution devices, where the RFID tag identification unit and the barcode identification unit are both used to acquire power distribution device information, operating parameters, and operating time data.
In this embodiment, preferably, the intelligent terminal includes a data receiving unit, a data sorting and classifying unit, and a data sending unit, the data receiving unit is configured to receive the distribution equipment data collected by the data collection module, the data sorting and classifying unit sorts and classifies all the data according to different types of information, and then packages the data, and the data sending unit sends the packaged data.
In this embodiment, preferably, the control module includes a central processing unit and a display, the central processing unit determines the accuracy of the data by comparing with the original parameters of the equipment, and the display is used for observing the operation status when monitoring each power distribution equipment.
In this embodiment, preferably, an automatic detection module is disposed in the central processing unit, and the automatic detection module performs data automatic detection on the monitoring points of the power distribution equipment at preset intervals, and sends the detection result to the central processing unit for data analysis, so as to determine abnormal voltage and current data of the power distribution equipment.
In this embodiment, preferably, the data management module includes a data conversion unit and a data storage unit, the data conversion unit converts data in different formats into data in a uniform format, and the data storage unit is configured to store parameter data of the power distribution equipment in the uniform format.
The working principle and the using process of the invention are as follows:
when the power distribution terminal operation data management system is used, the mobile terminal identifies and identifies a target object and acquires related data for power distribution equipment, and quickly and accurately identify and position the current power distribution equipment, is convenient for cross-regional power distribution data management, the data acquisition module is convenient for acquiring the operation data of various formats of various power distribution equipment, the intelligent terminal is used for classifying the acquired data according to different types of power distribution equipment, the data are distinguished, the data are distinguished conveniently, the control module is used for assisting the analysis and the processing of the data by adopting a distributed parameter and centralized parameter model, the accuracy of the data is determined, and the operating state of the power distribution equipment is controlled and detected, the data management module is used for converting the formats of all data into a uniform format to generate a data information coding value, so that the data can be conveniently stored.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. Distribution terminal operation data management system, its characterized in that: the intelligent terminal comprises a data acquisition module, a mobile terminal, an intelligent terminal, a control module and a data management module, wherein the data acquisition module is in communication connection with the mobile terminal, the intelligent terminal is in communication connection with the mobile terminal, the control module is connected with the control module, and the data management module is connected with the control module;
the mobile terminal is used for automatically identifying various power distribution equipment, identifying a target object, acquiring related data and quickly and accurately identifying and positioning the current power distribution equipment;
the data acquisition module is used for acquiring the operating data of various formats of various power distribution equipment;
the intelligent terminal is used for processing the data acquired by the data acquisition module to classify the data, classifying the data according to different types of power distribution equipment and distinguishing the data;
the control module is used for assisting in data analysis and processing by adopting a distributed parameter and centralized parameter model, determining the accuracy of data and controlling and detecting the running state of the power distribution equipment;
the data management module is used for converting formats of all data into a uniform format, generating a data information coding value and storing the data with the uniform format.
2. The power distribution terminal operation data management system of claim 1, wherein: the mobile terminal is one of a mobile phone, a notebook computer and a tablet personal computer, and a GPS coordinate bit unit is arranged in the mobile terminal and used for positioning equipment.
3. The power distribution terminal operation data management system of claim 1, wherein: the data acquisition module comprises an RFID electronic tag identification unit and a bar code identification unit, and an effective data identification mode is carried out according to different power distribution equipment, and the RFID electronic tag identification unit and the bar code identification unit are used for acquiring power distribution equipment information, operation parameters and operation time data.
4. The power distribution terminal operation data management system of claim 1, wherein: the intelligent terminal comprises a data receiving unit, a data sorting and classifying unit and a data sending unit, wherein the data receiving unit is used for receiving the data of the power distribution equipment collected by the data collecting module, the data sorting and classifying unit sorts and classifies all data according to different types of information and then packages the data, and the data sending unit sends the packaged data.
5. The power distribution terminal operation data management system of claim 1, wherein: the control module comprises a central processing unit and a display, the central processing unit determines the accuracy of data by comparing with original parameters of the equipment, and the display is used for observing the running state when monitoring each power distribution equipment.
6. The power distribution terminal operation data management system of claim 5, wherein: the automatic detection module is arranged in the central processing unit and used for automatically detecting data of monitoring points of the power distribution equipment at preset intervals, sending detection results to the central processing unit for data analysis, and determining voltage and current abnormal data of the power distribution equipment.
7. The power distribution terminal operation data management system of claim 1, wherein: the data management module comprises a data conversion unit and a data storage unit, wherein the data conversion unit converts data in different formats into data in a uniform format, and the data storage unit is used for storing parameter data of power distribution equipment in the uniform format.
8. The power distribution terminal operation data management system of claim 1, wherein: the method for generating the data information coding value comprises the following steps:
a. defining the encoded value En of the data information as a quaternion array: en ═ m (Ms, Mf, Ma, Mr), where Ms characterizes the classification system constituent code value of the data information, Mf characterizes the plane table constituent code value of the data information, Ma characterizes the structure table constituent code value of the data information, and Mr characterizes the pipelined code of the data information;
b. and respectively determining the sub-coding values represented by Ms, Mf and Ma, filling a quaternion array, performing linear analysis to obtain the required sub-coding values, filling a pipelined code Mr, finally forming a coding value of the data information, and verifying the generated data information coding to ensure the accuracy of the coding data.
9. The power distribution terminal operation data management system of claim 7, wherein: the data storage unit is provided with an encoding value retrieval subunit, and the encoding value retrieval subunit is used for retrieving the power distribution equipment information parameters in the database in the data storage unit.
10. The power distribution terminal operation data management system of claim 6, wherein: the voltage and current abnormal data detection and calculation formula of the power distribution equipment is as follows:
voltage loss calculation formula:
Figure FDA0002789314890000031
Figure FDA0002789314890000032
Δu%=0.13%<5%
and when the voltage is less than 5 percent, the voltage loss requirement is met.
Short circuit calculation:
short-circuit protection: in the physical process of three-phase short circuit in an infinite large-capacity power system, three-phase short circuit current is a periodic component plus a non-periodic component.
Namely: when the time goes to infinity, the aperiodic component goes to zero.
Namely:
when u is 0, the periodic component of the short-circuit current:
Figure FDA0002789314890000033
Figure FDA0002789314890000034
when t is 0:
Figure FDA0002789314890000035
i 'is the effective value of short-circuit sub-transient current, I' ═ I=Ik
Non-periodic component of short circuit current:
Figure FDA0002789314890000036
Figure FDA0002789314890000037
therefore, it is
Figure FDA0002789314890000038
Short-circuit full current: i.e. ik=ip+inp(ii) a Instantaneous total current effective value:
Figure FDA0002789314890000041
short-circuit impact current:
Figure FDA0002789314890000042
Figure FDA0002789314890000043
or
Figure FDA0002789314890000044
When the high-voltage circuit is in three-phase short circuit: ksh=1.8·ish=2.55I″ Ish=1.51I
Low voltage 1000KV A and below Ksh=1.3 ish=1.84I″ Ish=1.09I。
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