CN117269667A - Online simulation method and system for typical faults of low-voltage transformer area - Google Patents
Online simulation method and system for typical faults of low-voltage transformer area Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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Abstract
The invention belongs to the field of distribution automation of low-voltage transformer areas, and relates to a method and a system for simulating typical faults of a low-voltage transformer area on line. The simulation method comprises short circuit fault simulation, overload fault simulation and leakage fault simulation; the short-circuit faults comprise AB phase short-circuit faults, BC phase short-circuit faults and AC phase short-circuit faults; the leakage faults comprise A phase leakage faults, B phase leakage faults and C phase leakage faults; and transmitting a control instruction to the intelligent start controller through a TCP/IP network communication protocol, determining a target source code field corresponding to target instruction codes according to the mapping relation of the equipment point bit table, realizing online switching to different power supplies, and performing fault simulation. The system comprises an upper computer, an intelligent switching-on/switching-off controller, a fault simulation module, a fault selection contactor and a fault simulation access point. The method supports one-key flexible change of short-circuit current and leakage current, simulates the actual condition of typical faults of a low-voltage transformer area, and improves training efficiency.
Description
Technical Field
The invention belongs to the field of distribution automation of low-voltage transformer areas, and relates to a method and a system for simulating typical faults of a low-voltage transformer area on line.
Background
Along with the construction of the intelligent power grid, the requirements on the management and control of the transformer areas are continuously improved, and accordingly, the requirements on the skills of power grid staff are continuously improved. However, the operation maintainers in the transformer area have uneven experience and different skill levels, and can not be contacted simultaneously in the face of various faults in the transformer area, so that the operation environment is not fully known, the practical experience is insufficient, the learning time is long, the operation efficiency is low, and the intelligent power grid is one of the reasons for preventing the intelligent power grid from developing rapidly.
In the training of the personnel in the electric power universities or electric power enterprises, students or students need to learn and understand a lot of abstract knowledge and theory in the learning process of cultural lessons and professional lessons, and the application of the learned knowledge in the actual life is more clearly known. The existing situation is that schools or training centers do not have advanced and sufficient teaching equipment, so that a lecturer cannot clearly, simply and specifically transmit real and accurate information to students, and the professional technical level of the students cannot be effectively improved. Therefore, in the training of the power profession of the higher school or the internal personnel of the power enterprise, the system has the relevant software and hardware teaching simulation environment of the power industry, so that the practical application of the staff has a clearer concept, the professional theory is further deeply understood, the proficiency is improved for the later field use, and the misoperation caused by the unaware of the product can be reduced.
Disclosure of Invention
Aiming at the current situation, the invention provides a method and a system for simulating typical faults of a low-voltage transformer area on line, which are used for simulating short-circuit faults, overload faults and leakage faults of the low-voltage transformer area and supporting flexible changes of short-circuit current and leakage current; by restoring the real faults, typical fault simulation teaching is carried out, effective low-voltage transformer area typical fault simulation training is carried out on electric power staff or early-stage electric power professional students, and the skill level of the electric power network staff and the management and control capacity of the transformer area are improved.
The invention is realized by adopting the following technical scheme:
a method for simulating a typical fault of a low-voltage transformer area on line comprises short-circuit fault simulation, overload fault simulation and leakage fault simulation; the short-circuit faults comprise AB phase short-circuit faults, BC phase short-circuit faults and AC phase short-circuit faults; the leakage faults comprise A phase leakage faults, B phase leakage faults and C phase leakage faults;
according to the method, a control instruction is transmitted to the intelligent start controller through a TCP/IP network communication protocol, a target source code field corresponding to target instruction codes is determined according to the mapping relation of the equipment point bit table, on-line switching to different power supplies is realized, and short circuit fault simulation, overload fault simulation or leakage fault simulation is carried out.
The intelligent opening controller adopts Dtt-5106 intelligent opening controllers.
Further, the short-circuit and overload fault simulation method comprises the following steps:
s1, selecting a power supply mode;
s2, judging whether the power supply mode selected in the step S1 is a direct power supply, if so, continuing the step S3, otherwise, returning to the step S1 for reselection;
s3, according to the selected power supply mode, matching control bits corresponding to the configuration table, and switching the power supply mode by opening the control board opening contact; the configuration table is generated according to the equipment point position table;
s4, selecting a short-circuit fault phase, wherein the fault phase comprises an AB phase, a BC phase and an AC phase;
s5, selecting a fault resistor;
s6, judging whether the current equipment is in a normal state, if so, entering a step S8, otherwise, executing the operation of the step S7.
S7, matching control bits corresponding to the equipment in the configuration table, and switching the equipment to a normal state by opening the control board to open the contact;
s8, matching control bits corresponding to the configuration table according to the short-circuit fault type selected in the step S4 and the fault resistance selected in the step S5, and performing short-circuit fault control by opening a control board opening contact; the equipment faults can be repeatedly simulated according to the requirements in the step;
s9, matching control bits corresponding to the stop states in the configuration table, and stopping short-circuit fault simulation by opening the control board to open the contact.
The fault resistances in step S5 include 1Ω,2Ω, 3Ω, 4Ω,5Ω, 6Ω, and 7Ω.
Further, the leakage fault simulation method comprises the following steps:
s1, selecting a power supply mode;
s2, judging whether the power supply mode selected in the step S1 is an isolated power supply, if so, continuing the step S3, otherwise, returning to the step S1 for reselection;
s3, according to the selected power supply mode, matching control bits corresponding to the configuration table, and switching the power supply mode by opening the control board opening contact;
s4, selecting a leakage fault phase, wherein the fault phase comprises phase A leakage, phase B leakage and phase C leakage;
s5, selecting a leakage fault resistor;
s6, judging whether the current equipment is in a normal state, if so, entering a step S8, otherwise, executing a step S7;
s7, matching control bits corresponding to the equipment in the configuration table, and switching the equipment to a normal state by opening the control board to open the contact;
s8, matching control bits corresponding to the configuration table according to the leakage fault type selected in the step S4 and the fault resistance selected in the step S5, and performing leakage fault control by opening a control board opening contact; the equipment faults can be repeatedly simulated according to the requirements in the step;
and S9, matching control bits corresponding to the stop states in the configuration table, and stopping the electric leakage fault simulation by opening the control board to open the contact points.
The power supply mode in the step S1 comprises an isolation transformer and direct supply, wherein the isolation transformer supplies power after passing through an isolation transformer, and the direct supply is directly used for supplying power to the system without passing through the isolation transformer.
The leakage fault resistance in step S5 includes 200Ω, 400Ω, 600Ω, 800Ω, 1000Ω, 1200Ω, 1400 Ω, 1600 Ω, 1800 Ω, 2000 Ω, 2200 Ω, 2400 Ω, 2600 Ω, 2800 Ω, 3000 Ω, 3200 Ω, 3400 Ω, 3600 Ω, 3800 Ω, 4000 Ω, 4200 Ω, 4400 Ω, 4600 Ω, 4800 Ω, 5000 Ω, 5200 Ω, 5400 Ω, 5600 Ω, 5800 Ω, 6000 Ω, and 6200 Ω.
The equipment point position table is a document formed according to the field condition and is used for making a configuration table or an xml-form configuration file when a software program is written; the configuration table is stored in a database, and the configuration file is stored in the upper computer.
The opening control board adopts Dtt-5106 opening control boards.
An on-line simulated low voltage district typical fault simulation system comprising:
the upper computer is preset with a configuration table formed by a field device point position table, and sends a control instruction to the intelligent start controller through a TCP/IP network communication protocol; the intelligent start controller determines a target source code field corresponding to the target instruction code according to the mapping relation of the equipment point bit table, and realizes one-key online switching to different power supplies;
the intelligent opening controller is used for interaction between the upper computer and the equipment, the network port end of the intelligent opening controller is connected with the upper computer through a network cable, and the other end of the intelligent opening controller is connected with the equipment through a socket;
the fault simulation module is used for simulating the occurrence of typical fault types of the low-voltage transformer area;
a fault selection contactor for switching a fault location;
the fault simulation access point is connected with the fault position selection module in parallel and simulates faults at different positions by controlling the fault position selection switch; the fault position selection switch is used for connecting the fault simulation module with the district topology control cabinet.
The typical fault types include short circuit faults, overload faults, and leakage faults;
the fault simulation module comprises a short circuit fault simulation module, an overload fault simulation module, a leakage fault simulation module and a fault position selection module.
The fault simulation access point is arranged in a topological graph of the platform constructed by the comprehensive training screen of the platform, and covers equipment of levels such as a branch box, an ammeter box, a user load and the like.
The upper computer and the server thereof adopt a commercially available PC or notebook computer.
The on-line simulation low-voltage transformer area typical fault simulation system is provided with a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5, a sixth switch K6, a seventh switch K7, a first resistor R1 and a second resistor R2; the first switch K1, the second switch K2 and the third switch K3 are connected in parallel to form a first switch group, and the first switch K1, the second switch K2 and the third switch K3 are electrically interlocked, so that only one switch can be closed at the same time; the fourth switch K4, the fifth switch K5 and the sixth switch K6 are connected in parallel to form a second switch group, and the fourth switch K4, the fifth switch K5 and the sixth switch K6 are electrically interlocked, so that only one switch can be closed at the same time; the first resistor R1 is connected in series between the first switch group and the second switch group; one end of the second resistor R2 is connected with the first switch group, and the other end of the second resistor R2 is grounded through a seventh switch K7; the first switch K1, the second switch K2 and the third switch K3 are respectively connected with terminals A1, B1 and C1; the fourth switch K4, the fifth switch K5 and the sixth switch K6 are respectively connected with terminals A2, B2 and C2; the first resistor R1 is used as a short circuit and overload fault simulation module, and the second resistor R2 is used as a leakage fault simulation module; the A/B/C terminal at the left end of the module is connected with the A/B/C terminal at the right end in parallel and is used as an input terminal of the fault simulation module; when the fault simulation module is used, the switch input at the left end and the switch input at the right end of the fault simulation module are controlled to be in different phases, so that short circuit and overload faults between different phases can be simulated.
The fault selection contactors are, for example, a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5, a sixth switch K6, and a seventh switch K7.
The invention has the beneficial effects that:
the invention fully considers the development and construction requirements of the intelligent transformer area, develops the typical fault training of the low-voltage transformer area for operation and maintenance personnel based on the skill level of the current power grid operation and maintenance personnel, can be widely applied to the training of the internal personnel of power schools or power enterprises, can simulate short-circuit faults, overload faults and leakage faults, supports one-key flexible change of short-circuit current and leakage current, simulates the actual condition of the typical fault of the low-voltage transformer area, has a clearer fault concept through application in actual simulation, further deeply understands the professional theory, improves the proficiency for later field use, and can also reduce misoperation caused by unaware of products.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of a fault simulation module of the present invention;
FIG. 2 is a schematic diagram of a short circuit and overload fault simulation module;
FIG. 3 is a schematic diagram of a leakage fault simulation module;
FIG. 4 is a schematic diagram of fault simulation location selection in an embodiment;
FIG. 5 is a flow chart of a method for simulating short-circuit and overload faults in an embodiment;
fig. 6 is a flowchart of a leakage fault simulation method in an embodiment.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present invention will be described in detail below with reference to the following detailed description and the accompanying drawings. The following examples are included to aid one skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
The following describes a method for online simulating faults of a typical low-voltage transformer area in detail by referring to the drawings and embodiments.
A method for simulating a typical fault of a low-voltage transformer area on line comprises short-circuit fault simulation, overload fault simulation and leakage fault simulation; the short-circuit faults comprise AB phase short-circuit faults, BC phase short-circuit faults and AC phase short-circuit faults; the leakage faults comprise A phase leakage faults, B phase leakage faults and C phase leakage faults;
according to the method, a control instruction is transmitted to the intelligent start controller through a TCP/IP network communication protocol, a target source code field corresponding to target instruction codes is determined according to the mapping relation of the equipment point bit table, on-line switching to different power supplies is realized, and short circuit fault simulation, overload fault simulation or leakage fault simulation is carried out.
Examples
As shown in fig. 1, an on-line simulation low-voltage transformer area typical fault simulation system is provided with a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5, a sixth switch K6, a seventh switch K7, a first resistor R1 and a second resistor R2; the first switch K1, the second switch K2 and the third switch K3 are connected in parallel to form a first switch group, and the first switch K1, the second switch K2 and the third switch K3 are electrically interlocked, so that only one switch can be closed at the same time; the fourth switch K4, the fifth switch K5 and the sixth switch K6 are connected in parallel to form a second switch group, and the fourth switch K4, the fifth switch K5 and the sixth switch K6 are electrically interlocked, so that only one switch can be closed at the same time; the first resistor R1 is connected in series between the first switch group and the second switch group; one end of the second resistor R2 is connected with the first switch group, the other end of the second resistor R2 is grounded through a seventh switch K7, and a switch outgoing line of the seventh switch K7 is connected to the grounding row; the first switch K1, the second switch K2 and the third switch K3 are respectively connected with terminals A1, B1 and C1; the fourth switch K4, the fifth switch K5 and the sixth switch K6 are respectively connected with terminals A2, B2 and C2; the first resistor R1 is used as a short circuit and overload fault simulation module, and the second resistor R2 is used as a leakage fault simulation module; the A/B/C terminal at the left end of the module is connected with the A/B/C terminal at the right end in parallel and is used as an input terminal of the fault simulation module; when the fault simulation module is used, the switch input at the left end and the switch input at the right end of the fault simulation module are controlled to be in different phases, so that short circuit and overload faults between different phases can be simulated.
The fault positions are switched by means of fault selection contactors, for example the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, the sixth switch K6, the seventh switch K7 in fig. 1.
When the fault simulation scene is constructed, the power supply selection problem of different fault scenes must be strictly paid attention to, and the power supply selection problem is considered to be interlocked or electrically interlocked with the power supply control module switch setting software.
In practical use, the selection requirements of the fault scene and the power supply are as follows:
(1) Short-circuit faults and overload faults must be supplied by a 400V direct supply; i.e. a direct power supply.
(2) And the leakage fault is generated, and the normal output gear power supply is required to be changed through isolation.
As shown in fig. 2, a schematic diagram of a fault simulation module is shown. In this embodiment, the short-circuit and overload fault simulation module includes a resistor Rg1, a resistor Rg2, a resistor Rg3, and a resistor Rg4 connected in series, and a switch Kg2, a switch Kg3, and a switch Kg4 are connected in parallel to the resistor Rg2, the resistor Rg3, and the resistor Rg4, respectively; the resistor Rg1 serves as a fault resistor. The short circuit and overload fault simulation module adopts a plurality of resistors to be connected in series, and the states of the resistors are switched through a bypass switch, so that the simulation of faults in different areas of the intelligent circuit breaker of the short circuit and overload fault simulation module is met.
The intelligent circuit breaker selection key parameters of the short circuit and overload fault simulation module are as follows:
rated housing class: inm =125a;
rated current rating: in=63a;
rated current adjustment coefficient: 0.4 to 1;
overload delay time coefficient: 3-18 s;
short circuit short delay times: 2-10 In;
short circuit short delay time: 0.1 to 0.4ms;
short circuit transient multiple: 3 to 14 g In;
and (3) calculating overload long delay time:，
(wherein,: rated current setting, ">: fault current, tr1: delay overload factor set point);
calculating short-circuit delay time:（T2>200ms），
(wherein: rated current setting, ">: fault current, tr2: short circuit short delay time set point
The actual rated current of the circuit breaker is in=25a when the class of the circuit breaker housing is 125A, the rated current is 63A and the minimum setting coefficient is 0.4.
And taking the overload delay time coefficient as 3s, the short circuit delay fixed value isd=2in, the short circuit delay time coefficient as the minimum value Tr2=0.1 s, and the short circuit instantaneous fixed value Ii=3in.
If the actual running current is I, when In < I < Isd, the current is an overload section of the circuit breaker; when Isd < I < Ii, the circuit breaker is a short delay action interval; when I > Ii, the short-circuit instantaneous action interval is adopted;
when the rated current in=25a of the circuit breaker, an overload interval is set In a 25-50A interval, a short delay interval is set In a 50-75A interval, and an instantaneous operation interval is set above 75A.
If the fault simulation transition resistance is Rg and the fault current is Ig, the fault simulation transition resistance is provided with
When Rg is 4-11 omega, ig ranges from 34 to 95A, and the simulation of faults in each section can be satisfied.
Therefore, the total resistance value range of the resistor Rg1 (namely the fault resistor) in the embodiment is 4-11 omega, and the simulation of faults in different areas of the intelligent circuit breaker of the short circuit and overload fault simulation module can be met.
Wherein Rg1 adopts a fixed current limiting resistor, rg 2-Rg 4 adopts an adjustable resistor, and the resistance of the total module is controlled through a bypass switch (namely a switch Kg2, a switch Kg3 and a switch Kg 4), and the values of the resistors are as follows.
As shown in fig. 3, a schematic diagram of the leakage fault simulation module is shown.
In this embodiment, the leakage fault simulation module includes a resistor Rg1, a resistor Rg2, a resistor Rg3, a resistor Rg4, and a resistor Rg5 connected in series, where a switch Kg1, a switch Kg2, a switch Kg3, a switch Kg4, and a switch Kg5 are connected in parallel to the resistor Rg1, the resistor Rg2, the resistor Rg3, the resistor Rg4, and the resistor Rg5, respectively; the resistor Rg1 serves as a fault resistor. The leakage fault simulation module adopts a multistage resistance switching mode to realize the adjustment of fault transition resistance, so that the leakage current simulating the leakage fault can be adjusted in a corresponding interval; the corresponding interval is 35-1100mA.
In this embodiment, 5 sets of resistors (resistor Rg1, resistor Rg2, resistor Rg3, resistor Rg4, and resistor Rg 5) are selected to be connected in series and then used as the leakage fault simulation transition resistor (R2 in fig. 1).
The key parameters of the intelligent circuit breaker of the leakage fault simulation module are as follows:
rated residual operating current I Δn: 100. 150, 300, 500 are adjustable;
the resistance, power and corresponding leakage current of each stage of resistor in this embodiment are shown in table 2.
As shown in fig. 4, a schematic diagram is selected for the fault simulation location. And setting fault simulation access points at different positions of the platform region topology constructed by the platform region comprehensive training screen, wherein the access points cover different levels of a branch box, an ammeter box, a user load and the like. And each access point is connected in parallel to a fault position selection module, and faults at different positions can be simulated by controlling a fault position selection switch.
The upper computer intelligently opens a controller to transmit a control instruction to Dtt-5106 through a TCP/IP network communication protocol, determines a target source code field corresponding to target instruction codes according to the mapping relation of a device point position table, realizes one-key online switching to different power supplies, simulates AB phase short-circuit fault, BC phase short-circuit fault, AC phase short-circuit fault, A phase electric leakage, B phase electric leakage and C phase electric leakage, and can flexibly change short-circuit current and electric leakage current.
As shown in fig. 5, in this embodiment, the short-circuit overload fault simulation method includes the following steps:
s1, selecting a power supply mode;
s2, judging whether the power supply mode selected in the step S1 is a direct power supply, if so, continuing the step S3, otherwise, returning to the step S1 for reselection;
s3, according to the selected power supply mode, matching control bits corresponding to the configuration table, and switching the power supply mode by opening a control board opening contact through Dtt-5106; the configuration table is generated according to the equipment point position table;
s4, selecting a short-circuit fault phase, wherein the fault phase comprises an AB phase, a BC phase and an AC phase;
s5, selecting fault resistors, wherein the fault resistors are divided into: 1 Ω,2 Ω, 3 Ω, 4 Ω,5 Ω, 6 Ω,7 Ω;
s6, judging whether the current equipment is in a normal state (the current equipment state is read by the intelligent switch-out controller), if so, entering a step S8, otherwise, executing the operation of the step S7.
S7, matching control positions corresponding to the equipment in the configuration table normally, opening control panel opening and closing points through Dtt-5106, and switching the equipment to a normal state;
s8, matching control bits corresponding to the configuration table according to the short-circuit fault type selected in the step S4 and the fault resistance selected in the step S5, and opening a control board opening contact through Dtt-5106 to perform short-circuit fault control; the equipment faults can be repeatedly simulated according to the requirements in the step;
s9, matching control bits corresponding to the stop states in the configuration table, opening the control board opening contact through Dtt-5106, and stopping short circuit fault simulation.
As shown in fig. 6, the step flow of the leakage fault simulation method in this embodiment is as follows:
s1, selecting a power supply mode;
s2, judging whether the power supply mode selected in the step S1 is an isolated power supply, if so, continuing the step S3, otherwise, returning to the step S1 for reselection;
s3, according to the selected power supply mode, matching control bits corresponding to the configuration table, and switching the power supply mode by opening a control board opening contact through Dtt-5106;
s4, selecting a leakage fault phase, wherein the fault phase comprises phase A leakage, phase B leakage and phase C leakage;
s5, selecting leakage fault resistors, wherein the leakage fault resistors are divided into: 200 Ω, 400 Ω, 600 Ω, 800 Ω, 1000 Ω, 1200 Ω, 1400 Ω, 1600 Ω, 1800 Ω, 2000 Ω, 2200 Ω, 2400 Ω, 2600 Ω, 2800 Ω, 3000 Ω, 3200 Ω, 3400 Ω, 3600 Ω, 3800 Ω, 4000 Ω, 4200 Ω, 4400 Ω, 4600 Ω, 4800 Ω, 5000 Ω, 5200 Ω, 5400 Ω, 5600 Ω, 5800 Ω, 6000 Ω, 6200 Ω;
s6, judging whether the current equipment is in a normal state, if so, entering a step S8, otherwise, executing a step S7;
s7, matching control positions corresponding to the equipment in the configuration table normally, opening control panel opening and closing points through Dtt-5106, and switching the equipment to a normal state;
s8, matching control bits corresponding to the configuration table according to the leakage fault type selected in the step S4 and the fault resistance selected in the step S5, and opening a control board opening contact to perform leakage fault control through Dtt-5106; the equipment faults can be repeatedly simulated according to the requirements in the step;
s9, matching control bits corresponding to the stop states in the configuration table, opening the control board opening contact through Dtt-5106, and stopping leakage fault simulation.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes using the descriptions and drawings of the present invention or directly applied to other related technical fields are included in the scope of the invention.
According to the invention, the real faults of the low-voltage transformer area are restored, the typical fault simulation teaching of the low-voltage transformer area is developed, and effective low-voltage transformer area typical fault simulation training is carried out on electric power staff or early-stage electric power professional students, so that the skill level of the staff of each power grid is improved, and the management and control capability of the transformer area is improved.
Claims (10)
1. The on-line simulation method for the typical faults of the low-voltage transformer area is characterized by comprising short-circuit fault simulation, overload fault simulation and leakage fault simulation; the short-circuit faults comprise AB phase short-circuit faults, BC phase short-circuit faults and AC phase short-circuit faults; the leakage faults comprise A phase leakage faults, B phase leakage faults and C phase leakage faults;
according to the method, a control instruction is transmitted to the intelligent start controller through a TCP/IP network communication protocol, a target source code field corresponding to target instruction codes is determined according to the mapping relation of the equipment point bit table, on-line switching to different power supplies is realized, and short circuit fault simulation, overload fault simulation or leakage fault simulation is carried out.
2. The method for simulating a low-voltage area typical fault in an online manner according to claim 1, wherein the intelligent switching-out controller is Dtt-5106.
3. The method for on-line simulation of a low voltage section typical fault simulation according to claim 2, wherein the method for short circuit and overload fault simulation comprises the steps of:
s1, selecting a power supply mode;
s2, judging whether the power supply mode selected in the step S1 is a direct power supply, if so, continuing the step S3, otherwise, returning to the step S1 for reselection;
s3, according to the selected power supply mode, matching control bits corresponding to the configuration table, and switching the power supply mode by opening the control board opening contact; the configuration table is generated according to the equipment point position table;
s4, selecting a short-circuit fault phase, wherein the fault phase comprises an AB phase, a BC phase and an AC phase;
s5, selecting a fault resistor;
s6, judging whether the current equipment is in a normal state, if so, entering a step S8, otherwise, executing a step S7 operation;
s7, matching control bits corresponding to the equipment in the configuration table, and switching the equipment to a normal state by opening the control board to open the contact;
s8, matching control bits corresponding to the configuration table according to the short-circuit fault type selected in the step S4 and the fault resistance selected in the step S5, and performing short-circuit fault control by opening a control board opening contact; the equipment faults can be repeatedly simulated according to the requirements in the step;
s9, matching control bits corresponding to the stop states in the configuration table, and stopping short-circuit fault simulation by opening the control board to open the contact.
4. The on-line simulated low voltage transformer area typical fault simulation method as claimed in claim 3, wherein the fault resistance in step S5 comprises 1 Ω,2 Ω, 3 Ω, 4 Ω,5 Ω, 6 Ω and 7 Ω.
5. The on-line simulation low-voltage transformer area typical fault simulation method according to claim 2, wherein the leakage fault simulation method comprises the steps of:
s1, selecting a power supply mode;
s2, judging whether the power supply mode selected in the step S1 is an isolated power supply, if so, continuing the step S3, otherwise, returning to the step S1 for reselection;
s3, according to the selected power supply mode, matching control bits corresponding to the configuration table, and switching the power supply mode by opening the control board opening contact;
s4, selecting a leakage fault phase, wherein the fault phase comprises phase A leakage, phase B leakage and phase C leakage;
s5, selecting a leakage fault resistor;
s6, judging whether the current equipment is in a normal state, if so, entering a step S8, otherwise, executing a step S7;
s7, matching control bits corresponding to the equipment in the configuration table, and switching the equipment to a normal state by opening the control board to open the contact;
s8, matching control bits corresponding to the configuration table according to the leakage fault type selected in the step S4 and the fault resistance selected in the step S5, and performing leakage fault control by opening a control board opening contact; the equipment faults can be repeatedly simulated according to the requirements in the step;
and S9, matching control bits corresponding to the stop states in the configuration table, and stopping the electric leakage fault simulation by opening the control board to open the contact points.
6. The method for on-line simulation of a low-voltage transformer area typical fault simulation according to claim 3 or 5, wherein the power supply mode in step S1 comprises an isolation transformer and a direct supply, the isolation transformer supplies power after passing through an isolation transformer, and the direct supply is directly used for system power without passing through the isolation transformer.
7. The on-line simulated low-voltage transformer area typical fault simulation method according to claim 5, wherein the leakage fault resistance in step S5 comprises 200 Ω, 400 Ω, 600 Ω, 800 Ω, 1000 Ω, 1200 Ω, 1400 Ω, 1600 Ω, 1800 Ω, 2000 Ω, 2200 Ω, 2400 Ω, 2600 Ω, 2800 Ω, 3000 Ω, 3200 Ω, 3400 Ω, 3600 Ω, 3800 Ω, 4000 Ω, 4200 Ω, 4400 Ω, 4600 Ω, 4800 Ω, 5000 Ω, 5200 Ω, 5400 Ω, 5600 Ω, 5800 Ω, 6000 Ω, and 6200 Ω.
8. An on-line simulated low voltage district typical fault simulation system, comprising:
the upper computer is preset with a configuration table formed by a field device point position table, and sends a control instruction to the intelligent start controller through a TCP/IP network communication protocol; the intelligent start controller determines a target source code field corresponding to the target instruction code according to the mapping relation of the equipment point bit table, and realizes one-key online switching to different power supplies;
the intelligent opening controller is used for interaction between the upper computer and the equipment, the network port end of the intelligent opening controller is connected with the upper computer through a network cable, and the other end of the intelligent opening controller is connected with the equipment through a socket;
the fault simulation module is used for simulating the occurrence of typical fault types of the low-voltage transformer area;
a fault selection contactor for switching a fault location;
the fault simulation access point is connected with the fault position selection module in parallel and simulates faults at different positions by controlling the fault position selection switch; the fault position selection switch is used for connecting the fault simulation module with the district topology control cabinet.
9. The on-line simulated low voltage section typical fault simulation system of claim 8, wherein said typical fault types include short circuit faults, overload faults and leakage faults;
the fault simulation module comprises a short circuit fault simulation module, an overload fault simulation module, a leakage fault simulation module and a fault position selection module.
10. The on-line simulated low-voltage transformer area typical fault simulation system according to claim 8, wherein the system is provided with a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5, a sixth switch K6, a seventh switch K7, a first resistor R1 and a second resistor R2; the first switch K1, the second switch K2 and the third switch K3 are connected in parallel to form a first switch group, and the first switch K1, the second switch K2 and the third switch K3 are electrically interlocked, so that only one switch can be closed at the same time; the fourth switch K4, the fifth switch K5 and the sixth switch K6 are connected in parallel to form a second switch group, and the fourth switch K4, the fifth switch K5 and the sixth switch K6 are electrically interlocked, so that only one switch can be closed at the same time; the first resistor R1 is connected in series between the first switch group and the second switch group; one end of the second resistor R2 is connected with the first switch group, and the other end of the second resistor R2 is grounded through a seventh switch K7; the first switch K1, the second switch K2 and the third switch K3 are respectively connected with terminals A1, B1 and C1; the fourth switch K4, the fifth switch K5 and the sixth switch K6 are respectively connected with terminals A2, B2 and C2; the first resistor R1 is used as a short circuit and overload fault simulation module, and the second resistor R2 is used as a leakage fault simulation module; the A/B/C terminal at the left end of the module is connected with the A/B/C terminal at the right end in parallel and is used as an input terminal of the fault simulation module; when the fault simulation module is used, the switches at the left end and the right end of the fault simulation module are controlled to be put into different phases, so that short circuit and overload faults between the different phases are simulated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311198320.8A CN117269667A (en) | 2023-09-18 | 2023-09-18 | Online simulation method and system for typical faults of low-voltage transformer area |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311198320.8A CN117269667A (en) | 2023-09-18 | 2023-09-18 | Online simulation method and system for typical faults of low-voltage transformer area |
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| CN117269667A true CN117269667A (en) | 2023-12-22 |
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| CN202311198320.8A Pending CN117269667A (en) | 2023-09-18 | 2023-09-18 | Online simulation method and system for typical faults of low-voltage transformer area |
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| Country | Link |
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| CN (1) | CN117269667A (en) |
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