CN116520085A - Forest pasture area low-voltage fire test system and method - Google Patents
Forest pasture area low-voltage fire test system and method Download PDFInfo
- Publication number
- CN116520085A CN116520085A CN202310506602.3A CN202310506602A CN116520085A CN 116520085 A CN116520085 A CN 116520085A CN 202310506602 A CN202310506602 A CN 202310506602A CN 116520085 A CN116520085 A CN 116520085A
- Authority
- CN
- China
- Prior art keywords
- phase
- voltage
- overhead
- fault
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 137
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000004088 simulation Methods 0.000 claims abstract description 66
- 230000005540 biological transmission Effects 0.000 claims abstract description 41
- 238000009413 insulation Methods 0.000 claims abstract description 13
- 238000002485 combustion reaction Methods 0.000 claims abstract description 9
- 230000015556 catabolic process Effects 0.000 claims description 14
- 230000009471 action Effects 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 12
- 241000196324 Embryophyta Species 0.000 description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000011161 development Methods 0.000 description 5
- 238000010891 electric arc Methods 0.000 description 3
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 2
- 235000011613 Pinus brutia Nutrition 0.000 description 2
- 241000018646 Pinus brutia Species 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- 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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
-
- 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
- G01R31/10—Locating faults in cables, transmission lines, or networks by increasing destruction at fault, e.g. burning-in by using a pulse generator operating a special programme
-
- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention relates to the technical field of electrical safety, in particular to a system and a method for testing low-voltage fires in a forest and pasture area, comprising the following steps: the system comprises a low-voltage power distribution cabinet, a power supply system, a wave recording system and a fault simulation area; the fault simulation area is used for performing simulation tests on faults of the overhead lines with different diameters or insulation characteristics according to preset test working conditions in various types of fault simulation tests of the overhead lines; the power supply system is used for outputting three-phase voltage alternating current when simulating faults of different types of overhead lines; the low-voltage power distribution cabinet is used for detecting bus three-phase voltage and outgoing three-phase current under different overhead line fault types so that the wave recording system detects whether an arc breaks down or not and acquires corresponding fault simulation information. According to the invention, various fault types and plant combustion of the overhead transmission line are tested, so that the condition of short-circuit arc in the fault process can be effectively analyzed, and the probability of fire disaster caused by the fault of the power distribution network of Lin Muou is reduced.
Description
Technical Field
The invention relates to the technical field of electrical safety, in particular to a system and a method for testing low-voltage fires in a forest and pasture area.
Background
With the rapid development of national economy, the demands of various industries on electricity are larger and larger, the concepts of the global energy Internet, smart grids and the like are put forward, so that a power distribution network gradually becomes a research hot spot of related scholars at home and abroad, the power distribution network is positioned at the tail end of a power system and is in the most contact with power users such as residents, factories and the like and is an indispensable part of the power system, but the power distribution network has the characteristics of multiple outgoing lines of the power distribution system, complex network structure, various neutral point grounding modes, extremely high fault probability of a feeder line and the like, wherein the single-phase grounding fault proportion is the largest, and the fault probability is nearly 80%.
The traditional power distribution network operation regulations provide that when the grounding current is smaller than 10A, the power distribution network can continue to operate for two hours with faults, but at present, most of power electronic equipment used in the power distribution network is nonlinear load, the proportion of cable lines is higher and higher, so that the reactive component, the active component and the harmonic content in the grounding fault current are higher and higher, the proportion of the active current and the harmonic current in the grounding fault can exceed 10% of the total current, the fault residual current is larger under the condition, and the residual active or harmonic component is enough to cause that the electric arc cannot be extinguished by itself, even overvoltage and further development of faults are caused, and further stable operation of a power grid, equipment damage, personal safety and occurrence of forest and pastoral area fire are influenced, so that a scientific, accurate and reliable forest and pastoral area low-voltage fire test system is needed.
Disclosure of Invention
The invention aims to provide a system and a method for testing low-voltage fires in a forest and pastoral area, which are used for effectively analyzing the condition of short-circuit arc in the fault process and reducing the probability of fire in the forest and pastoral area caused by power distribution network faults by testing various fault types and plant combustion.
In order to solve the technical problems, the invention provides a system and a method for testing low-voltage fires in a forest and pasture area.
In a first aspect, the invention provides a forest and pasture area low-voltage fire test system, which comprises a low-voltage power distribution cabinet, a power supply system, a wave recording system and a fault simulation area, wherein the power supply system, the wave recording system and the fault simulation area are connected with the low-voltage power distribution cabinet;
the fault simulation area is used for performing simulation tests on faults of the overhead lines with different diameters or insulation characteristics according to preset test working conditions in various overhead line fault simulation tests;
the power supply system is used for outputting three-phase voltage alternating current to the low-voltage power distribution cabinet through a distribution transformer when different types of overhead line faults are simulated;
the low-voltage power distribution cabinet is used for detecting bus three-phase voltage and outgoing three-phase current under different overhead line fault types through a three-phase current transformer and a three-phase voltage transformer after receiving the alternating current of the three-phase voltage;
and the wave recording system is used for detecting whether arc breakdown exists or not according to the received bus three-phase voltage and the received outgoing line three-phase current, and acquiring corresponding fault simulation information.
In a further embodiment, the power system comprises a single-phase power supply, a pole-on-pole circuit breaker, and a distribution transformer;
the single-phase power supply is connected with the distribution transformer through the pole-mounted circuit breaker, and the distribution transformer is connected with the three-phase input end of the low-voltage distribution cabinet through an overhead line three-phase wire.
In a further embodiment, the low-voltage power distribution cabinet comprises a three-phase fuse type isolating switch, a three-phase current transformer and a three-phase overhead line air circuit breaker which are arranged on an overhead line, wherein the three-phase fuse type isolating switch is connected with the three-phase overhead line air circuit breaker through the three-phase current transformer, and the fault simulation area is connected with the output end of the three-phase overhead line air circuit breaker;
the low-voltage power distribution cabinet further comprises a three-phase voltage transformer, and the three-phase voltage transformer is connected between the three-phase current transformer and the three-phase overhead line air circuit breaker through a three-phase air circuit breaker.
In a further embodiment, the system further comprises a control system connected to the input of the low voltage power distribution cabinet;
the control system is used for remotely controlling the action of the three-phase fuse type isolating switch in the low-voltage power distribution cabinet when the fault simulation test of the overhead line is started, so that the high-voltage side of the distribution transformer is boosted, and the actions of the three-phase overhead line air circuit breaker and the three-phase air circuit breaker are remotely controlled after the high-voltage side of the distribution transformer is boosted to a preset voltage value.
In further embodiments, the test conditions include a single phase earth fault test condition, a single phase break fault test condition, a two phase short circuit fault test condition, and a woodland plant combustion test condition.
In a further embodiment, the single-phase earth fault test conditions are specifically:
the method comprises the steps of fixing an overhead power transmission line by using two insulating support belt fixtures, connecting one side of the overhead power transmission line to a power supply system, suspending the other side of the overhead power transmission line, removing insulating skin in the middle of the overhead power transmission line, exposing the lower part of the overhead power transmission line, and placing combustible on a polar plate below the exposed overhead power transmission line, wherein the polar plate is grounded, and lifting equipment is placed below the polar plate, so that the discharge distance between the combustible and the ground of the overhead power transmission line is adjusted by the lifting equipment.
In a further embodiment, the single-phase disconnection fault test conditions are specifically:
the method comprises the steps of fixing an overhead transmission line by using two insulating support belt retainers, connecting one side of the overhead transmission line to a power supply system, placing the other side of the overhead transmission line above a grounded polar plate, adjusting the distance between the section of the overhead transmission line and the polar plate by using a tripod in the middle of the overhead transmission line, and connecting an adjustable transition resistor on the overhead line between the insulating support and the tripod so as to adjust a breakdown fault current value through the adjustable transition resistor and place combustible materials above the polar plate.
In a further embodiment, the two-phase short circuit fault test conditions are specifically:
and connecting loads at the tail ends of the three-phase overhead transmission line, directly placing the two-phase short-circuit touch object above the A phase and the B phase of the overhead transmission line in a power-off state, adjusting the distance of the three-phase line, and performing a power-on test.
In a further embodiment, the fault simulation zone further comprises a monitoring system;
the monitoring system is used for monitoring the simulation test of the fault simulation area in real time.
In a second aspect, the invention provides a method for testing low-voltage fires in a woodland, comprising the following steps:
in various overhead line fault simulation tests, according to preset test working conditions, simulating faults of overhead lines with different diameters or insulation characteristics;
when faults of different types of overhead lines are simulated, outputting alternating current of three-phase voltages through a distribution transformer, and detecting bus three-phase voltages and outgoing three-phase currents under the fault types of the different overhead lines;
and detecting whether arc breakdown exists or not according to the received bus three-phase voltage and the received outgoing line three-phase current, and acquiring corresponding fault simulation information.
The invention provides a system and a method for testing low-voltage fires in a forest and pasture area, wherein the system comprises a low-voltage power distribution cabinet, a power supply system, a wave recording system and a fault simulation area; the fault simulation area is used for performing simulation tests on faults of the overhead lines with different diameters or insulation characteristics according to preset test working conditions in various overhead line fault simulation tests; the power supply system is used for outputting three-phase voltage alternating current when simulating faults of different types of overhead lines; the low-voltage power distribution cabinet is used for detecting bus three-phase voltage and outgoing three-phase current under different overhead line fault types so that the wave recording system detects whether an arc breaks down or not and acquires corresponding fault simulation information. According to the method, various fault types and plant combustion of the overhead transmission line are tested, and meanwhile, the waveform recording is carried out through the fault recording system, so that the condition of short-circuit arc in the fault process can be effectively analyzed, data support is provided for analyzing fire disaster caused by the fault of the power distribution network in the forest and pasture area, and the probability of the fire disaster caused by the fault of the power distribution network in Lin Muou is reduced.
Drawings
FIG. 1 is a block diagram of a forest pasture low-voltage fire test system provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of a power supply system according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of a test operation flow provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of a single-phase earth fault test condition provided by an embodiment of the present invention;
FIG. 5 is a schematic diagram of a single-phase disconnection fault test condition provided by an embodiment of the present invention;
FIG. 6 is a schematic diagram of a two-phase short-circuit fault test condition provided by an embodiment of the present invention;
FIG. 7 is a schematic diagram of a test condition of high temperature melt generation splash combustibles provided by an embodiment of the present invention;
fig. 8 is a schematic diagram of an experimental condition of an overhead line affected by a forest fire according to an embodiment of the present invention;
fig. 9 is a schematic flow chart of a method for testing low-voltage fires in a forest and pasture area according to an embodiment of the invention.
Detailed Description
The following examples are given for the purpose of illustration only and are not to be construed as limiting the invention, including the drawings for reference and description only, and are not to be construed as limiting the scope of the invention as many variations thereof are possible without departing from the spirit and scope of the invention.
Referring to fig. 1, an embodiment of the present invention provides a low-voltage fire test system for a forest pasture, as shown in fig. 1, the system includes: the low-voltage power distribution cabinet 10, and the power supply system 11, the control system 12, the wave recording system 13 and the fault simulation area 14 which are connected with the low-voltage power distribution cabinet 10, in this embodiment, the fault simulation area, the low-voltage power distribution cabinet, the high-voltage circuit breaker, the isolating switch, the transformer and other devices in the test system are all installed outdoors, and the power supply system, the control system, the transformer and the wave recording system are all installed indoors so as to ensure the safety of test personnel.
In one embodiment, the fault simulation area 14 is provided with a monitoring system and an overhead power transmission line, and the fault simulation area is used for performing simulation tests on faults of overhead lines with different diameters or insulation characteristics according to preset test working conditions in various types of fault simulation tests of the overhead lines, in this embodiment, the overhead power transmission line arranged in the fault simulation area is preferably made of aluminum-steel-cored wires (ACSR), the aluminum-steel-cored wires are formed by twisting aluminum wires and steel wires, and a test platform can provide an LGJ-10 type bare wire, an LGJ-35 type aluminum-steel-cored wire, an LGJ-70 type aluminum-steel-cored wire and an LGJ-120 type aluminum-cored wire to detect the capability of the overhead lines with different diameters and insulation to cope with the faults, wherein L is the abbreviation of the aluminum wires, G is the abbreviation of the steel-cored wires, and J is the abbreviation of the wires; the steel core mainly plays a role in increasing strength, the aluminum stranded wires mainly play a role in transmitting electric energy, and a person skilled in the art can replace the overhead transmission line according to specific implementation conditions, and the invention is not limited.
In this embodiment, various fault types of the overhead lines with different diameters and insulation characteristics are truly simulated through the fault simulation area 14, so as to detect the capability of the overhead lines to cope with faults, for example, simulate faults of various types such as single-phase grounding faults, broken line faults and two-phase short circuit faults, and meanwhile, through the simulation test of the fault simulation area monitored in real time by the monitoring system, the fault simulation area in this embodiment can also perform a tree grounding test on the overhead lines and a plant burning test such as pine needles and pine needles in the forest and pasture area in a targeted manner according to the tree stand conditions in the forest pasture area, so as to simulate and analyze the operation condition of the forest pasture area distribution network line affected by mountain fire.
In one embodiment, the power supply system 11 includes a single-phase power supply, a pole-mounted circuit breaker, and a distribution transformer, wherein the single-phase power supply is connected to the distribution transformer through the pole-mounted circuit breaker, and the distribution transformer is connected to a three-phase input end of the low-voltage power distribution cabinet through an overhead line three-phase wire; the power supply system is used for outputting three-phase voltage alternating current to the low-voltage power distribution cabinet through the distribution transformer when different types of overhead line faults are simulated in the fault simulation area.
Specifically, as shown in fig. 2, the power supply system 11 adopted in the embodiment is a 10kV power supply system and is used for providing power signal input, the 10kV power supply system comprises a 10kV single-phase power supply, a pole-mounted breaker 1KM with a voltage level of 10kV and a distribution transformer 1T, so as to transmit power to the distribution transformer 1T through the pole-mounted breaker 1KM with the voltage level of 10kV, thereby outputting three-phase 380V voltage alternating current through the output end of the distribution transformer 1T, the embodiment preferably sets model parameters of the distribution transformer 1T to 200kva 10500/400V, outputs three-phase 380V alternating current after transformation by the distribution transformer 1T and the action of power electronic components, and the 380V side of the distribution transformer is connected in series with a low-voltage distribution cabinet by adopting a TN-C system, a 200A fuse and a 100A air switch to perform short-circuit level difference matching.
In one embodiment, the low-voltage power distribution cabinet 10 includes a three-phase fuse type isolating switch, a three-phase current transformer and a three-phase overhead line air circuit breaker which are arranged on an overhead line, wherein the three-phase fuse type isolating switch is connected with the three-phase overhead line air circuit breaker through the three-phase current transformer, and the fault simulation area is connected with an output end of the three-phase overhead line air circuit breaker; the low-voltage power distribution cabinet further comprises a three-phase voltage transformer and a three-phase air circuit breaker, wherein the three-phase voltage transformer is connected between the three-phase current transformer and the three-phase overhead line air circuit breaker through the three-phase air circuit breaker.
The low-voltage power distribution cabinet 10 is used for detecting bus three-phase voltage and outgoing three-phase current under different overhead line fault types through a three-phase current transformer and a three-phase voltage transformer after receiving the alternating current of the three-phase voltage.
According to the embodiment, the safety and controllability of the test and the extraction of the voltage and current parameters are ensured through the low-voltage power distribution cabinet, the low-voltage power distribution cabinet is provided with the three-phase fuse type isolating switch 1QS-FU with the three-phase linkage of 380V voltage level, the parameters of the three-phase fuse type isolating switch 1QS-FU are preferentially set to be 250A, the fuse type isolating switch 1QS-FU is adopted for line protection, the characteristics of the fuse and the isolating switch are achieved, the fuse can be overcome, the fuse type isolating switch 1QS-FU has the capability of being opened once, melts with the same specification can be replaced, and meanwhile, the fuse type isolating switch can be put into operation again, and meanwhile, due to the fact that the fuse type isolating switch 1QS-FU has good overcurrent protection effect, the fuse type isolating switch 1QS-FU is arranged in the low-voltage power distribution cabinet, and a long-distance detection function can be achieved.
In the embodiment, a three-phase overhead line air breaker 2QF and a three-phase air breaker 1QF connected with a voltage transformer are further arranged in a low-voltage power distribution cabinet, wherein the three-phase overhead line air breaker 2QF is arranged on an overhead line, the three-phase air breaker 1QF is used for connection between an overhead line and three voltage transformers, the two types of breakers are three-phase breakers, parameters of the three-phase overhead line air breaker 2QF are preferably set to 100a, parameters of a PT (voltage transformer) three-phase air breaker 1QF are preferably set to 1A, in the embodiment, the three-phase overhead line air breaker 2QF is matched with a fuse type isolating switch 1QS-FU, and equipment of different factories can be replaced by an air switch, a breaker and an isolating switch selected in the embodiment so as to detect the breaking capacity of equipment in a fault state.
The parameters of the three-phase voltage transformer set in the embodiment are preferably set to JDG 4-0.5-400/100V, and are respectively arranged in each phase of A, B, C three phases of an overhead line, namely 1TV, 2TV and 3TV; meanwhile, the parameters of the three-phase current transformer set in the embodiment are preferably set to be 200/5A, and are respectively arranged in each phase of A, B, C three phases of the overhead line and are respectively 1TA, 2TA and 3TA.
In one embodiment, the wave recording system 13 is configured to obtain corresponding fault simulation information according to whether the received bus three-phase voltage and the received outlet three-phase current detect arc breakdown.
In this embodiment, the recording system 13 is configured to collect voltage and current signals, where the sampling rate of an oscilloscope adopted by the recording system is preferably set to 2.5GS/s, the bandwidth is preferably set to 500MHz, the instrument frequency is preferably set to 10kHz, 6 channels are a total of the fault recording channels, which are 380V bus voltage and three-phase current, and simultaneously set the recording system to multi-channel synchronous sampling, where the recording system is connected to a three-phase voltage transformer and a three-phase current transformer of the low-voltage power distribution cabinet, and after the three-phase voltage transformer and the three-phase current transformer output 380V bus three-phase voltage and outlet three-phase current respectively, the corresponding voltage waveform signal and current waveform signal are generated, and in this embodiment, the generated voltage waveform signal and current waveform signal are analyzed to determine whether there is arc breakdown, specifically, whether there is sudden change of zero sequence voltage and zero sequence current according to the sudden change of zero sequence voltage and zero sequence current, so as to detect whether there is arc breakdown of zero sequence voltage and zero sequence current, if there is sudden change of zero sequence voltage and zero sequence current, then the fault test indicates that there is arc breakdown; if the sudden change of the zero sequence voltage and the zero sequence current does not exist, the fact that the test fault is not arcing is described, and it is to be described that the wave recording system in the embodiment can automatically record the voltage waveform signal and the current waveform signal related to the three-phase fuse type isolating switch and the three-phase overhead line air circuit breaker after the action, and can also manually start wave recording according to specific requirements.
In this embodiment, the test system further includes a control system 12 connected to the input end of the low-voltage power distribution cabinet, where the control system 12 is used to remotely control the actions of the three-phase fuse type disconnecting switch and the three-phase overhead line air circuit breaker in the low-voltage power distribution cabinet.
The control system 12 is specifically configured to remotely control the actions of a three-phase fuse type isolating switch in a low-voltage power distribution cabinet when an overhead line fault simulation test is started, so that the high-voltage side of a distribution transformer is boosted, and remotely control the actions of a three-phase overhead line air circuit breaker and a three-phase air circuit breaker after the high-voltage side of the distribution transformer is boosted to a preset voltage value.
As shown in fig. 3, before a test starts, a test personnel manually sets a test fault condition to be simulated in advance, after the test condition is set, the test personnel exits the test site, an outdoor camera is aligned to the test center site and enters an indoor control room, a remote control three-phase fuse type isolating switch 1QS-FU is switched on, then boosting is carried out, the high voltage side is raised to 10kV, then a remote control three-phase air circuit breaker 1QF is switched on, a three-phase voltage transformer is put into operation, the remote control three-phase overhead line air circuit breaker 2QF is switched on, namely, the set fault condition type occurs during normal operation is simulated, after the test is finished, the power is cut off, the field is checked, a test result is checked, meanwhile, a voltage and current signal waveform diagram recorded by a wave recording system is extracted, whether the voltage and current signal waveform diagram has abrupt changes of zero sequence voltage and zero sequence current or not is judged, if the fault test has arc breakdown, if the fault test does not exist and all the test conditions are not completely finished, and the model of an overhead line is replaced to be retested; if an arc is generated, judging that the faults have fire hazards under the set working condition; if certain combustible substances exist around, fire is easy to generate, protection is needed, if electric arcs cannot be generated after all lines and the combustible substance working conditions are replaced, no fire hidden danger exists under the working conditions, and the arcing mode meets the related requirements of national standard GB/T17467.
In this embodiment, the test conditions include a single-phase earth fault test condition, a single-phase disconnection fault test condition, a two-phase short circuit fault test condition, and a forest and pasture area plant combustion test condition.
FIG. 4 is a schematic diagram of a single-phase earth fault test, in which an analog test is performed on a single-phase earth fault, two insulating support belt fixtures are used to fix an overhead transmission line, the insulating skin in the middle of the overhead transmission line is removed, and combustible materials such as southern broadleaf fallen leaves, needles and weeds are placed under the exposed overhead transmission line; the pole plate below the combustible is grounded, one side of the overhead line is connected to a power supply system, the other side of the overhead line is suspended, lifting equipment is placed below the pole plate, the lifting equipment preferably selects a jack, so that the discharge distance between the combustible and the ground is adjusted through the jack, and the single-phase grounding fault simulation test conducted by the embodiment can be used for simulating the insulation discharge between the combustible and the ground under the condition of insulation damage of the overhead line, and whether the discharge can cause the combustion of the combustible is observed.
Fig. 5 is a schematic diagram of a working condition of a single-phase broken line fault test, in this embodiment, a simulation test is performed on a single-phase broken line fault, two insulating support belt retainers are used to fix an overhead line, an adjustable transition resistor is connected to the overhead line between an insulating support and a tripod, so as to adjust the magnitude of a breakdown fault current value through the adjustable transition resistor, one side of the overhead power line is connected to a power supply system, the tail end of the overhead power line is placed above a grounded polar plate, the middle of the overhead power line is used to adjust the distance between the section of the line and the polar plate by the tripod, the tripod moves leftwards to increase the distance, the distance can be reduced rightwards, a combustible is placed above the polar plate, and the single-phase broken line fault simulation test performed in this embodiment can be used to simulate insulation discharge between the combustible and the ground under the condition of broken line of the overhead power line, and observe whether the discharge can cause the combustible to burn.
Fig. 6 is a schematic diagram of a working condition of a two-phase short-circuit fault test, in which a simulation test is performed on a two-phase short-circuit fault, a three-phase overhead transmission line is normally laid, a load is applied to the end of the three-phase overhead transmission line, a distance between the three-phase lines is d, and two-phase short-circuit touching objects are directly placed above phases a and B in a power-off state, wherein the two-phase short-circuit touching objects are tree leaves and the like, and then the power-on test is performed.
The test system provided by the embodiment can also simulate the test of igniting combustible materials by splashing high-temperature melt which possibly occurs under the discharge fault of the overhead transmission line, two insulating support band fixtures are adopted to fix two test aluminum wires, one side of each insulating wire is connected into a power supply system, the other side of each insulating wire is grounded, one insulating support is movable and used for adjusting the length of an electric arc so as to increase the electric arc energy, the test phenomenon is more obvious, the combustible materials are placed below the test aluminum wires on one polar plate, the variety of the combustible materials is changeable, such as southern broadleaf fallen leaves, needle leaves, weeds and the like can be adopted, and lifting equipment is arranged below the polar plate, and is a jack, so that the heights of the combustible materials and the test aluminum wires can be adjusted through the jack, and the specific test working condition is shown in fig. 7.
Meanwhile, the test system provided by the embodiment can also be used for artificially setting the power transmission line in a burning environment so as to simulate the operation condition of the forest and pasture area distribution network line affected by mountain fire, and can be used for verifying whether the power transmission line is broken due to flame temperature and whether electric arcs are more easily generated due to dust generated by burning plants between the lines or not, and the recording system can record the change condition of voltage and current when the system is operated, so that verification and analysis of test results are conveniently carried out after the test, the specific test working condition is shown in fig. 8, the test system provided by the embodiment can also be used for simulating other various overhead line fault types, and the specific test working condition is not limited to the embodiment of the invention and is not repeated herein.
The embodiment of the invention provides a forest and pasture area low-voltage fire test system, which realizes simulation tests on various overhead line fault types and plant combustion through a low-voltage power distribution cabinet, a power supply system, a wave recording system and a fault simulation area, wherein the power supply system, the wave recording system and the fault simulation area are connected with the low-voltage power distribution cabinet, and fault simulation information of the fault test is acquired by the wave recording system so as to effectively analyze the development condition of short-circuit arc in the fault process at the later stage of the test, thereby being beneficial to analyzing the development state of electric fire and greatly improving the authenticity and reliability of the forest and pasture area low-voltage fire fault simulation.
In one embodiment, as shown in fig. 9, the embodiment of the invention provides a method for testing low-voltage fires in a woodland, which comprises the following steps:
s1, in various overhead line fault simulation tests, carrying out simulation tests on overhead line faults with different diameters or insulation characteristics according to preset test working conditions;
s2, outputting three-phase voltage alternating current through a distribution transformer when simulating faults of different overhead lines, and detecting bus three-phase voltage and outgoing three-phase current under different overhead line fault types;
s3, detecting whether arc breakdown exists or not according to the received bus three-phase voltage and the received outlet three-phase current, and acquiring corresponding fault simulation information.
It should be noted that, the sequence number of each process does not mean that the execution sequence of each process is determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.
The specific limitation of the method for testing the low-pressure fire in the forest-pasture area can be referred to the limitation of the system for testing the low-pressure fire in the forest-pasture area, and the description is omitted here. Those of ordinary skill in the art will appreciate that the various modules and steps described in connection with the embodiments disclosed herein may be implemented as hardware, software, or a combination of both. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The embodiment of the invention provides a method for testing low-voltage fires in a forest and pasture area, which comprises the steps of performing simulation tests on faults of different types of overhead lines according to preset test working conditions in the simulation tests; when faults of different types of overhead lines are simulated, outputting alternating current of three-phase voltages through a distribution transformer, and detecting bus three-phase voltages and outgoing three-phase currents under the fault types of the different overhead lines; and detecting whether arc breakdown exists or not according to the received bus three-phase voltage and the received outgoing line three-phase current, and acquiring corresponding fault simulation information. Compared with the prior art, the method and the device can set different test working conditions through the fault simulation area, simulate various fault types and plant combustion tests such as single-phase grounding fault, broken line fault, two-phase short-circuit fault and the like of the power distribution network in the forest and pastoral area, and generate voltage waveform signals and current waveform signals through the wave recording system so as to analyze the development condition of short-circuit arc in the fault process, the whole test process is free from excessive test personnel participation, the detection efficiency is effectively improved, meanwhile, the method and the device are favorable for analyzing the cause of fire disaster caused by the fault of the power distribution network in the forest and pastoral area, reduce the probability of the fire disaster caused by the fault of the power distribution network in the forest and pastoral area, and have high practicability and are suitable for popularization and application.
The foregoing examples represent only a few preferred embodiments of the present application, which are described in more detail and are not thereby to be construed as limiting the scope of the invention. It should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and substitutions should also be considered to be within the scope of the present application. Therefore, the protection scope of the patent application is subject to the protection scope of the claims.
Claims (10)
1. A forest pasture area low-voltage fire test system, comprising: the low-voltage power distribution cabinet is connected with a power supply system, a wave recording system and a fault simulation area;
the fault simulation area is used for performing simulation tests on faults of the overhead lines with different diameters or insulation characteristics according to preset test working conditions in various overhead line fault simulation tests;
the power supply system is used for outputting three-phase voltage alternating current to the low-voltage power distribution cabinet through a distribution transformer when different types of overhead line faults are simulated;
the low-voltage power distribution cabinet is used for detecting bus three-phase voltage and outgoing three-phase current under different overhead line fault types through a three-phase current transformer and a three-phase voltage transformer after receiving the alternating current of the three-phase voltage;
and the wave recording system is used for detecting whether arc breakdown exists or not according to the received bus three-phase voltage and the received outgoing line three-phase current, and acquiring corresponding fault simulation information.
2. A forest pasture area low-voltage fire test system as recited in claim 1, wherein: the power supply system comprises a single-phase power supply, a pole-mounted circuit breaker and a distribution transformer;
the single-phase power supply is connected with the distribution transformer through the pole-mounted circuit breaker, and the distribution transformer is connected with the three-phase input end of the low-voltage distribution cabinet through an overhead line three-phase wire.
3. A forest pasture area low-voltage fire test system as recited in claim 1, wherein: the low-voltage power distribution cabinet comprises a three-phase fuse type isolating switch, a three-phase current transformer and a three-phase overhead line air circuit breaker which are arranged on an overhead line, wherein the three-phase fuse type isolating switch is connected with the three-phase overhead line air circuit breaker through the three-phase current transformer, and the fault simulation area is connected with the output end of the three-phase overhead line air circuit breaker;
the low-voltage power distribution cabinet further comprises a three-phase voltage transformer, and the three-phase voltage transformer is connected between the three-phase current transformer and the three-phase overhead line air circuit breaker through a three-phase air circuit breaker.
4. A forest pasture area low-voltage fire test system as recited in claim 1, wherein: the control system is connected with the input end of the low-voltage power distribution cabinet;
the control system is used for remotely controlling the action of the three-phase fuse type isolating switch in the low-voltage power distribution cabinet when the fault simulation test of the overhead line is started, so that the high-voltage side of the distribution transformer is boosted, and the actions of the three-phase overhead line air circuit breaker and the three-phase air circuit breaker are remotely controlled after the high-voltage side of the distribution transformer is boosted to a preset voltage value.
5. A forest pasture area low-voltage fire test system as recited in claim 1, wherein: the test working conditions comprise a single-phase earth fault test working condition, a single-phase broken line fault test working condition, a two-phase short circuit fault test working condition and a forest and pasture area plant combustion test working condition.
6. The forest pasture area low-voltage fire test system as claimed in claim 5, wherein the single-phase grounding fault test conditions are specifically as follows:
the method comprises the steps of fixing an overhead power transmission line by using two insulating support belt fixtures, connecting one side of the overhead power transmission line to a power supply system, suspending the other side of the overhead power transmission line, removing insulating skin in the middle of the overhead power transmission line, exposing the lower part of the overhead power transmission line, and placing combustible on a polar plate below the exposed overhead power transmission line, wherein the polar plate is grounded, and lifting equipment is placed below the polar plate, so that the discharge distance between the combustible and the ground of the overhead power transmission line is adjusted by the lifting equipment.
7. The forest stand low-voltage fire test system of claim 5, wherein the single-phase disconnection fault test conditions are specifically as follows:
the method comprises the steps of fixing an overhead transmission line by using two insulating support belt retainers, connecting one side of the overhead transmission line to a power supply system, placing the other side of the overhead transmission line above a grounded polar plate, adjusting the distance between the section of the overhead transmission line and the polar plate by using a tripod in the middle of the overhead transmission line, and connecting an adjustable transition resistor on the overhead line between the insulating support and the tripod so as to adjust a breakdown fault current value through the adjustable transition resistor and place combustible materials above the polar plate.
8. The forest pasture area low-voltage fire test system as claimed in claim 5, wherein the two-phase short-circuit fault test conditions are specifically as follows:
and connecting loads at the tail ends of the three-phase overhead transmission line, directly placing the two-phase short-circuit touch object above the A phase and the B phase of the overhead transmission line in a power-off state, adjusting the distance of the three-phase line, and performing a power-on test.
9. A forest pasture area low-voltage fire test system as recited in claim 1, wherein: the fault simulation area further comprises a monitoring system;
the monitoring system is used for monitoring the simulation test of the fault simulation area in real time.
10. The method for testing the forest pasture low-voltage fire is characterized by comprising the following steps of:
in various overhead line fault simulation tests, according to preset test working conditions, simulating faults of overhead lines with different diameters or insulation characteristics;
when faults of different types of overhead lines are simulated, outputting alternating current of three-phase voltages through a distribution transformer, and detecting bus three-phase voltages and outgoing three-phase currents under the fault types of the different overhead lines;
and detecting whether arc breakdown exists or not according to the received bus three-phase voltage and the received outgoing line three-phase current, and acquiring corresponding fault simulation information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310506602.3A CN116520085A (en) | 2023-05-06 | 2023-05-06 | Forest pasture area low-voltage fire test system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310506602.3A CN116520085A (en) | 2023-05-06 | 2023-05-06 | Forest pasture area low-voltage fire test system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116520085A true CN116520085A (en) | 2023-08-01 |
Family
ID=87393785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310506602.3A Pending CN116520085A (en) | 2023-05-06 | 2023-05-06 | Forest pasture area low-voltage fire test system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116520085A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117554742A (en) * | 2023-11-10 | 2024-02-13 | 国网四川省电力公司电力科学研究院 | Experimental measurement device and method for triggering forest and grassland fires by wire breakage falling |
-
2023
- 2023-05-06 CN CN202310506602.3A patent/CN116520085A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117554742A (en) * | 2023-11-10 | 2024-02-13 | 国网四川省电力公司电力科学研究院 | Experimental measurement device and method for triggering forest and grassland fires by wire breakage falling |
| CN117554742B (en) * | 2023-11-10 | 2024-05-31 | 国网四川省电力公司电力科学研究院 | Experimental measurement device and method for triggering forest and grassland fires by wire breakage falling |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107966633B (en) | Method and system for rapidly judging single-phase earth fault line of power distribution network of power supply system | |
| CN109669103B (en) | Real type power distribution network multi-state complex fault simulation test platform and test method | |
| CN109001591A (en) | A kind of 10kV power distribution network primary equipment intelligence fortune inspection engineering test platform | |
| CN104914391A (en) | Distribution network single-phase grounding fault simulation and positioning performance test platform and method | |
| CN116520085A (en) | Forest pasture area low-voltage fire test system and method | |
| CN111337790A (en) | Distribution network real mirror test platform and detection method for primary and secondary fusion power distribution equipment | |
| CN104635128A (en) | Arc fault recognition capability experimental analysis device and experimental analysis method thereof | |
| CN111463760A (en) | Zero-sequence disturbance line selection protection system for neutral ungrounded substation and application thereof | |
| CN108562827A (en) | A kind of small current earthing wire-selecting method and system | |
| CN105576621B (en) | A kind of arc light protection method | |
| CN112485717A (en) | Power distribution true test load simulation device and method | |
| CN112986743B (en) | Active intervention type arc suppression device test system function system | |
| CN113030636A (en) | Active intervention type arc suppression device test system | |
| CN109799413A (en) | A kind of single phase grounding current of electric power network and electric arc self arc time simulation test method | |
| CN109444788B (en) | Test platform for single-phase grounding test of power distribution network and control method | |
| CN111262224A (en) | Multi-voltage transformer ferromagnetic resonance suppression method based on island mode | |
| CN206788308U (en) | Full-automatic multiloop secondary cable Insulation test servicing unit | |
| CN214174589U (en) | Power distribution true test load simulation device | |
| CN211554215U (en) | Fault suppression system for common-frequency and same-phase voltage withstand test of three-phase common-cylinder GIS equipment | |
| Wang et al. | A leakage protection method for low-voltage power supply systems based on flexible regulation of the neutral point voltage | |
| CN108051675B (en) | High-altitude area 35kV and below live-line switching no-load line research method | |
| Li et al. | Research on arc model of disconnector for conduction interference of electronic transformer | |
| Liu et al. | Research and application of series compensation protection automatic testing technology | |
| Li et al. | The experimental technique and practical scheme of intelligent switch in power distribution IoT | |
| CN211627790U (en) | Low-voltage transformer area electric leakage fault troubleshooting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |