CN112117070B - Full-span insulation matching method and device for eliminating span central direct flashover - Google Patents
Full-span insulation matching method and device for eliminating span central direct flashover Download PDFInfo
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- CN112117070B CN112117070B CN201910537325.6A CN201910537325A CN112117070B CN 112117070 B CN112117070 B CN 112117070B CN 201910537325 A CN201910537325 A CN 201910537325A CN 112117070 B CN112117070 B CN 112117070B
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- 238000009413 insulation Methods 0.000 title claims abstract description 39
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- 239000004020 conductor Substances 0.000 claims abstract description 48
- 208000025274 Lightning injury Diseases 0.000 claims abstract description 37
- 239000012212 insulator Substances 0.000 claims abstract description 35
- 230000006698 induction Effects 0.000 claims abstract description 27
- 239000003574 free electron Substances 0.000 claims abstract description 25
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 8
- 238000004146 energy storage Methods 0.000 claims description 36
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
- H01B17/46—Means for providing an external arc-discharge path
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
- H02G13/80—Discharge by conduction or dissipation, e.g. rods, arresters, spark gaps
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Abstract
The invention discloses a full-span insulation matching method and a full-span insulation matching device for eliminating span center direct flashover, which belong to the field of flashover elimination methods, and comprise the steps that when lightning stroke is in the span center or near the span center, lightning overvoltage is transmitted from a lightning stroke point to towers at two ends; a sensor in a preionization discharge system arranged on a tower collects lightning wave signals or receives lightning electromagnetic field signals through space radio induction, and the preionization discharge system preionizes and discharges to generate free electrons and/or sparks; the insulating match ratio is reduced, the preionization gap channel is preferentially short-circuited and grounded, the lightning conductor and the conducting wire are equipotential and are rapidly conducted to a lightning stroke point, the lightning stroke point is equipotential, the lightning stroke potential is rapidly reset to zero, and the generation of span central flashover is avoided. Even if the high-voltage line is struck by lightning in the center of the span, the discharge channel is only arranged on the preionization channel at the insulator, and the local flashover at the lightning strike point is avoided, so that the flashover channel generated by the lightning strike is changed into flashover only at the preionization position from multiple positions.
Description
Technical Field
The invention relates to the field of flashover elimination methods, in particular to a full-span insulation matching method and device for eliminating direct flashover of a span center.
Background
On a power transmission line with a lightning conductor, only 1/6-1/3 lightning strikes on the tower top and the lightning conductor nearby, and the rest lightning strikes on the section of the lightning conductor in the middle of the span. There is about a 10% probability that a lightning strike will strike the center of the span of the line, but the overvoltage at the center of the span is the same as the overvoltage at the center of the span. High overvoltage can also be generated at the lightning strike point when the lightning strike is at the center of the span of the lightning conductor. In the areas with high lightning damage, such as canyons, valleys and the like, due to large span and different matching coefficients of the lightning conductor and the wire, the distance between the lightning conductor and the wire is closer and closer, the wire is closest to the center, the wire is easy to discharge at the moment, and the span is directly flashover from the center.
Meanwhile, the distance between the power generation resources and the central region of the power load is far in China, the proportion of the extra-high voltage power transmission in a power grid is larger and larger as an important means for solving the large-range configuration of energy, and the safety and stability of the extra-high voltage power transmission are important for ensuring the safe and reliable operation of the power grid. Lightning shielding failure is an important factor influencing the operation reliability of the extra-high voltage line; in the power transmission line with the voltage level of more than 500kV, the probability of the shielding failure in the center of the span is as high as 80%, and the security of the power grid is greatly threatened.
In the conventional static insulation matching, in order to ensure that the discharge voltage of the gap is lower than that of the insulator (string), the gap distance L is 0.7 to 0.8 times the insulator length distance L0, and L/L0 is called as a static insulation matching ratio and is generally less than 1.
In the actual operation process, due to the influence of factors such as atmospheric conditions (air pressure, air temperature, humidity, fog, rain, dew, ice and snow and the like), the static insulation matching has the following problems: (1) the static insulation matching reduces the overall insulation level of the circuit; (2) the protection range of static insulation matching is limited, only one section of line near a pole and tower insulator can be protected, and the full span cannot be covered. Aiming at the problems existing in static insulation matching, a full-span dynamic insulation matching method for eliminating direct flashover of the center of a span needs to be developed.
Disclosure of Invention
The present invention aims to provide a full-span insulation matching method and device for eliminating direct flashover of the center of a span, so as to solve the technical problems mentioned in the background technology.
A full-span insulation matching method for eliminating span center direct flashover comprises the following steps:
step 1: when lightning stroke is in the center of the span or near the center of the span, lightning overvoltage is rapidly transmitted to the towers at two ends from a lightning stroke point;
step 2: a sensor in a preionization discharge system arranged on a tower collects lightning wave signals or receives lightning electromagnetic field signals through space induction, and the preionization discharge system preionizes and discharges to generate free electrons and/or sparks;
and step 3: the insulating match ratio is reduced, the preionization gap channel is preferentially punctured by thunder and lightning, the gap is short-circuited and grounded, the lightning conductor and the lead are equipotential and are rapidly conducted to a lightning stroke point, the lightning stroke point is equipotential, the lightning stroke potential is rapidly reset to zero, and the generation of span central flashover is avoided.
And 4, step 4: the interphase voltage after returning to zero tends to zero, so that long-gap and long-distance discharge is interrupted, and interphase flashover in the middle of a span is avoided;
and 5: the flashover electric arc in the gap channel is quickly extinguished through the active arc extinguishing devices which are arranged on the two sides of the insulator in parallel, the electric arc is extinguished before the breaker acts, and the occurrence of lightning trip is avoided.
Further, the preionization discharge system in the step 2 comprises a lightning induction module, a trigger control module, an energy storage module and an preionization module, the lightning induction modules arranged at two ends of the pole and tower insulator sense the electric field intensity of lightning, and output signals to the trigger control module, the trigger control module judges after receiving the electric field intensity signals, when the electric field intensity is larger than a threshold value, an opening signal is sent to the energy storage module, the energy storage module provides preionization energy to the preionization module after receiving the opening signal, the preionization energy forms high-voltage ionization discharge in the preionization module, and a large amount of free electrons and/or spark discharge are generated.
Furthermore, the lightning induction module is arranged on the power transmission line, the lightning conductor or the cross arm and used for inducing the surrounding electric field intensity, the trigger control module judges the received signal and determines whether to start the energy storage module, and the energy storage module is used for storing energy for generating preionization; the pre-ionization module utilizes the energy in the energy storage module to perform pre-ionization discharge, and generates a large amount of free electrons or generates ionization spark discharge.
Further, in the step 2, an upper electrode connected with a low-voltage end is arranged at the upper end of an insulator arranged on the tower, a lower electrode connected with a high-voltage end is arranged at the bottom of the insulator, and the distance between the upper electrode and the lower electrode is larger than or equal to the height of the insulator.
Further, in the step 3, in the insulation matching, under the condition of no lightning, the insulation matching ratio is equal to or greater than 1, when lightning strikes to the center of the span or the vicinity of the center of the span, lightning overvoltage is rapidly transmitted from the lightning strike point to the tower, free electrons in the air gap are increased after the preionization discharge system works, a priority discharge channel is formed, spark discharge is generated, the discharge voltage of the gap is far lower than that of the insulator or the insulator string, the actual insulation matching ratio is far less than 1, and the preionization channel is approximately short-circuited.
Furthermore, when the span center is struck by lightning, the time for short circuit of an electric arc between the lightning conductor and the conducting wire or between the conducting wires is far longer than the time for transmitting lightning overvoltage to the tower from the lightning stroke point along the lightning conductor or the conducting wire, after the preionization channel is firstly punctured, the lightning conductor and the conducting wire are equipotential and immediately transmitted to the lightning stroke point in the span center, so that the lightning stroke point is equipotential, the lightning stroke potential is quickly reset to zero, and flashover of the span center is avoided.
Further, the upper electrode is an active arc extinguishing device and/or a metal electrode, and the lower electrode is an active arc extinguishing device and/or a metal electrode.
The utility model provides an eliminate full-span insulation cooperation device of span central authorities direct flashover, includes upper electrode, bottom electrode and preionization discharge system, upper electrode and bottom electrode set up respectively at insulator or insulating cluster both ends, constitute the air gap between upper electrode and the bottom electrode, the distance of air gap is less than the length of insulator or insulating cluster, preionization discharge system sets up on upper electrode or bottom electrode, and is connected with transmission line or lightning conductor respectively, and the sensor in the preionization discharge system gathers thunder wave signal or receives the thunder and lightning electromagnetic field signal through space induction, and preionization discharge system preionization discharges, produces free electron and/or spark, and the air gap short circuit discharges.
Furthermore, the pre-ionization discharge system comprises a lightning induction module, a trigger control module, an energy storage module and a pre-ionization module, wherein the lightning induction module is arranged on the power transmission line, the lightning conductor or the cross arm and is used for inducing the surrounding electric field intensity; the trigger control module judges the received signal and determines whether to start the energy storage module or not; the energy storage module is used for storing energy for generating preionization; the pre-ionization module utilizes the energy in the energy storage module to carry out pre-ionization discharge, generates a large amount of free electrons and even generates ionization spark discharge.
Furthermore, when the span center is struck by lightning, the time for short circuit of an electric arc between the lightning conductor and the conducting wire or between the conducting wires is far longer than the time for transmitting lightning overvoltage to a tower from a lightning stroke point along the lightning conductor or the conducting wire, after the air gap is firstly punctured, the lightning conductor and the conducting wire have the same potential and are quickly transmitted to the span center lightning stroke point, so that the lightning stroke point is also at the same potential, the lightning stroke potential returns to zero, and flashover of the span center is avoided.
Further, the pre-ionization module may employ high voltage packet ionization or photo-ionization devices.
By adopting the technical scheme, the invention has the following technical effects:
(1) even if the high-voltage line is struck by lightning in the center of the span, the discharge channel is only arranged on the preionization channel at the insulator, and the local flashover at the lightning stroke point is avoided, so that the flashover channel generated by the lightning stroke is changed from a plurality of places into flashover only at the preionization place;
(2) when the span of the tower is struck by lightning or a central lightning conductor, the lightning overvoltage reaching the tower is preferentially flashover in the preionization gap of the insulator, so that the lightning conductor and the conductor are equipotential and are rapidly conducted to a lightning stroke point, the lightning stroke position is equipotential, and the lightning stroke potential is rapidly returned to zero, thereby avoiding the span central flashover.
(3) The range of insulation fit protection is extended from near the insulator to the full span range.
Drawings
FIG. 1 is a flow chart of the operation of a pre-ionization discharge device module.
Fig. 2 is a flow chart of the operation process of the pre-ionization discharge device.
FIG. 3 is a schematic view of a dynamic insulation ratio structure installation.
Fig. 4 is a schematic view of a lightning strike to a center ground or wire.
In the figure: 1-an upper electrode; 2-discharging ignition spark; 3-free electron; 4-a lower electrode; 5-lightning strike point; 6-insulating matching device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings by way of examples of preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
Embodiments of the present invention are further described in accordance with the foregoing description of principles and with reference to fig. 1-3:
the invention provides a full-span insulation matching method for eliminating span central direct flashover, which comprises the following steps:
step 1: when lightning strikes are in the center of the span or near the center of the span, lightning overvoltage is transmitted from the lightning strike point to the towers at the two ends. The high-voltage line needs to pass through some valleys, canyons or rivers and the like in many times, the distance between two towers is relatively far, when being struck by lightning, the high-voltage line can strike the position of the center of the span with a high probability, and the high-voltage line can strike the tower by lightning rarely. However, flashover often occurs at the center of the span, and a certain time is required for flashover formation. However, since the speed of conduction is comparable to the speed of light when a lightning strikes a conductor or a lightning conductor, the time of transmission is much less than the time of flashover formation. As shown in fig. 4, when lightning strikes in the center of the span, high voltage is conducted to both sides, the conduction speed is close to the light speed and is very fast, and then the time sensed by the tower is almost the same as the time of the lightning strike, so that the discharging can be performed before the flashover is formed.
Step 2: the pre-ionization discharge system arranged on the tower senses lightning, and the pre-ionization discharge system performs pre-ionization discharge to generate free electrons and/or sparks.
The preionization discharge system comprises a lightning induction module, a trigger control module, an energy storage module and an preionization module, the lightning induction modules arranged at two ends of a pole and tower insulator sense the electric field intensity of lightning, and output signals to the trigger control module, the trigger control module judges after receiving electric field intensity signals, when the electric field intensity is larger than a threshold value, an opening signal is sent to the energy storage module, the energy storage module provides preionization energy to the preionization module after receiving the opening signal, the preionization energy forms high-voltage ionization discharge in the preionization module, and a large amount of free electrons and/or spark discharge are generated.
The lightning induction module is arranged on the power transmission line, the lightning conductor or the cross arm and used for inducing the surrounding electric field intensity, the trigger control module judges the received signal and determines whether to start the energy storage module, and the energy storage module is used for storing energy for generating preionization; the pre-ionization module utilizes the energy in the energy storage module to perform pre-ionization discharge, and generates a large amount of free electrons or generates ionization spark discharge. The upper end of an insulator arranged on the tower is provided with an upper electrode connected with a low-voltage end, the bottom of the insulator is provided with a lower electrode connected with a high-voltage end, and the distance between the upper electrode and the lower electrode is larger than or equal to the height of the insulator. The upper electrode is an active arc extinguishing device and/or a metal electrode, and the lower electrode is an active arc extinguishing device and/or a metal electrode.
The upper electrode connected with the low-voltage end can be an active arc extinguishing device or a metal electrode, and the lower electrode connected with the high-voltage end can be an active arc extinguishing device or a metal electrode.
The pre-ionization discharge system is an integral large module consisting of a lightning induction module, a trigger control module, an energy storage module, a pre-ionization module and accessories, and can be used on the upper electrode and the lower electrode independently or simultaneously. The lightning induction module can be arranged on a power transmission line, a lightning conductor or a cross arm and is used for inducing the surrounding electric field intensity; the trigger control module judges the received signal and determines whether to start the energy storage module or not; the energy storage module is used for storing energy for generating preionization; the pre-ionization module utilizes the energy in the energy storage module to carry out pre-ionization discharge, generates a large amount of free electrons and even generates ionization spark discharge.
When lightning strikes to the center of the span of the high-voltage line, the time of the lightning transmitted from the center of the span to the tower is set as t transmission, the reaction time of the pre-ionization discharge system is t inverse, and the reaction time of the pre-ionization discharge system is compared with the signal perception and the threshold value, so that the time is very short and only the level of a few tenths of microseconds is used. Thus, assume that the time from lightning strike to discharge is t1The time from lightning strike to flashover is t2Then t isConveying appliance+tInverse direction＝t1，t1Much less than t2Therefore, the discharge is started before the flashover is not formed, so that the lightning conductor and the conducting wire at the lightning stroke form the equipotential, and the flashover cannot be generated.
And step 3: the insulating match ratio is reduced, the preionization gap channel is preferentially punctured by thunder, the lightning conductor and the conducting wire are equipotential and are rapidly conducted to a lightning stroke point, the lightning stroke point is equipotential, the lightning stroke potential is rapidly reset to zero, and the generation of span central flashover is avoided. In the insulating matching, under the condition of no lightning, the insulating matching ratio is equal to or more than 1, when lightning strikes to the center of the span or the vicinity of the center of the span, lightning overvoltage is transmitted to a tower from a lightning strike point, free electrons in an air gap are increased after a pre-ionization discharge system works, a priority discharge channel is formed, spark discharge is generated, the discharge voltage of the gap is far lower than that of an insulator or an insulator string, the actual insulating matching ratio is far less than 1, and the pre-ionization channel is approximately short-circuited.
When the span center is struck by lightning, the time of short circuit of an electric arc between a lightning conductor and a lead or between lead phases is far longer than the time of transmitting lightning overvoltage to a tower from a lightning point along the lightning conductor or the lead, after the preionization channel is preferentially punctured, the lightning conductor and the lead are equipotential and immediately transmitted to the span center lightning point, so that the lightning point is equipotential, the lightning potential is rapidly returned to zero, and flashover of the span center is avoided.
When lightning strikes in the center of the span and near the center, lightning overvoltage is transmitted from a lightning strike point to the tower, and at the moment, the induction element in the lightning induction module near the insulator of the tower senses the electric field intensity nearby and outputs a signal to the trigger control module. The trigger control module judges after receiving the electric field intensity signal, and sends a starting signal to the energy storage module when the electric field intensity is greater than a set threshold value. The energy storage module provides preionization energy for the preionization module after receiving the opening signal, high-voltage ionization discharge is formed in the preionization module, a large number of free electrons and spark discharge are generated, at the moment, preionization discharge work starts, and the insulation matching ratio is automatically reduced.
As shown in FIG. 3, the insulator has a distance length L0The gap between the upper and lower electrodes is L, when the upper and lower electrodes generate free electrons orAfter the spark, the portion with free electrons or spark is relatively conductive, and the gap is changed to L1，L1The portion of the distance where free electrons or sparks are present is subtracted from L. The discharge voltage of the gap is far lower than that of the insulator (string), and the dynamic insulation mix ratio L is at the moment1/L0Far less than 1, a preferential discharge channel is formed, the pre-ionization gap is preferentially flashover, so that the lightning conductor and the lead are equipotential and are rapidly conducted to a lightning stroke point, and the lightning stroke position is also equipotential, thereby avoiding flashover at the center of the span.
As the speed of the lightning voltage wave and the current wave conducted on the lightning conductor or the power transmission line is very high, close to the light speed and far faster than the speed of the penetration channel generated by the electric arc between the central conductor and the ground wire or the conductor interphase, the transverse flashover probability of the central lightning strike point of the span is greatly reduced, and the insulation matching protection range is expanded from the insulator to the full-span range.
The full-span insulation matching device for eliminating span central direct flashover comprises an upper electrode, a lower electrode and a preionization discharge system, wherein the upper electrode and the lower electrode are respectively arranged at two ends of an insulator or an insulation string, an air gap is formed between the upper electrode and the lower electrode, the distance of the air gap is smaller than the length of the insulator or the insulation string, the preionization discharge system is arranged on the upper electrode or the lower electrode and is respectively connected with a power transmission line or a lightning conductor, the preionization discharge system senses lightning, the preionization discharge system preionizes discharge to generate free electrons and/or sparks, and the air gap short-circuit discharge is realized.
The pre-ionization discharge system comprises a lightning induction module, a trigger control module, an energy storage module and a pre-ionization module, wherein the lightning induction module is arranged on a power transmission line, a lightning conductor or a cross arm and is used for inducing the surrounding electric field intensity; the trigger control module judges the received signal and determines whether to start the energy storage module or not; the energy storage module is used for storing energy for generating preionization; the pre-ionization module utilizes the energy in the energy storage module to carry out pre-ionization discharge, generates a large amount of free electrons and even generates ionization spark discharge. When the span center is struck by lightning, the time for short circuit of an electric arc between a lightning conductor and a lead or between lead phases is far longer than the time for transmitting lightning overvoltage to a tower from a lightning point along the lightning conductor or the lead, after the air gap is firstly punctured, the lightning conductor and the lead are equipotential and quickly transmitted to the span center lightning point, so that the lightning point is equipotential, the lightning potential is quickly reset to zero, and flashover of the span center is avoided.
When the cooperation of initiative arc control device and metal electrode that upper and lower electrode used, when discharging and switching on, production electric arc, initiative arc control device uses the mode of solid phase air current arc extinguishing or compression arc extinguishing to electric arc to make electric arc extinguish, and the effectual burning that prevents electric arc to the electrode because the temperature of electric arc is too high, and electrode can be burnt to long-time electric arc for the electrode shortens. The active arc-extinguishing device is arranged, so that the occurrence of the problem can be effectively prevented.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (10)
1. A full-span insulation matching method for eliminating span center direct flashover is characterized by comprising the following steps:
step 1: when lightning stroke is in the center of the span or near the center of the span, lightning overvoltage is rapidly transmitted to the towers at two ends from a lightning stroke point;
step 2: a sensor in a preionization discharge system arranged on a tower collects lightning wave signals or receives lightning electromagnetic field signals through space radio induction, and the preionization discharge system preionizes and discharges to generate free electrons and/or sparks;
and step 3: the insulation mix proportion is reduced, the pre-ionization gap channel is firstly punctured by thunder, the gap is short-circuited and grounded, the lightning conductor and the lead are equipotential and are quickly conducted to a lightning stroke point, the lightning stroke point is equipotential, the lightning stroke potential is quickly reset to zero, and the flashover of the span center is avoided;
and 4, step 4: the interphase voltage after return to zero is driven to zero, and negative reflection waves are sent to a lightning stroke point, so that long-gap and long-distance discharge is interrupted, and interphase flashover in the middle of a span is avoided;
and 5: the flashover electric arc in the gap channel is quickly extinguished through the active arc extinguishing devices which are arranged on the two sides of the insulator in parallel, the electric arc is extinguished before the breaker acts, and the occurrence of lightning trip is avoided.
2. The full-span insulation fit method for eliminating span center direct flashover according to claim 1, wherein: the preionization discharge system in the step 2 comprises a lightning induction module, a trigger control module, an energy storage module and an preionization module, the lightning induction modules arranged at two ends of the pole and tower insulator sense the electric field intensity of lightning or receive a lightning electromagnetic field signal through space wireless induction, and output a signal to the trigger control module, the trigger control module judges after receiving the electric field intensity signal, when the electric field intensity is larger than a threshold value, the energy storage module sends an opening signal, the energy storage module provides preionization energy for the preionization module after receiving the opening signal, the preionization energy forms high-voltage ionization discharge in the preionization module, and a large amount of free electrons and/or spark discharge are generated.
3. The full-span insulation fit method for eliminating span center direct flashover according to claim 2, wherein: the lightning induction module is arranged on the power transmission line, the lightning conductor or the cross arm and used for inducing the surrounding electric field intensity or receiving a lightning electromagnetic field signal through space wireless induction, the trigger control module judges the received signal and determines whether to start the energy storage module, and the energy storage module is used for storing energy for generating preionization; the pre-ionization module utilizes the energy in the energy storage module to perform pre-ionization discharge, and generates a large amount of free electrons or generates ionization spark discharge.
4. The full-span insulation fit method for eliminating span center direct flashover according to claim 2, wherein: in the step 2, an upper electrode connected with a low-voltage end is arranged at the upper end of an insulator arranged on the tower, a lower electrode connected with a high-voltage end is arranged at the bottom of the insulator, and the distance between the upper electrode and the lower electrode is larger than or equal to the height of the insulator.
5. The full-span insulation fit method for eliminating span center direct flashover according to claim 4, wherein: in the step 3, in the insulating matching, under the condition of no lightning, the insulating matching ratio is equal to 1 or more than 1, when lightning stroke is carried out on the center of the span or near the center of the span, lightning overvoltage is transmitted from a lightning stroke point to a tower, free electrons in an air gap are increased after the preionization discharge system works, a preferential discharge channel is formed, spark discharge is generated, the discharge voltage of the gap is far lower than that of an insulator or an insulator string, the actual insulating matching ratio is far less than 1, and the preionization channel is approximately short-circuited.
6. The full-span insulation fit method for eliminating span center direct flashover according to claim 5, wherein: when the span is struck by lightning, the time of short circuit between the lightning conductor and the conducting wire or between the conducting wires is far longer than the time of transmitting lightning overvoltage to the tower from the lightning point along the lightning conductor or the conducting wire, after the preionization channel is preferentially punctured, the negative reflection wave is transmitted to the lightning point, the lightning conductor and the conducting wire are equipotential and are immediately transmitted to the central lightning point of the span, so that the lightning point is equipotential, the lightning potential is rapidly reset to zero, and flashover of the center of the span is avoided.
7. The full-span insulation fit method for eliminating span center direct flashover according to claim 4, wherein: the upper electrode is an active arc extinguishing device and/or a metal electrode, and the lower electrode is an active arc extinguishing device and/or a metal electrode.
8. The apparatus of claim 1 for full-span insulation fit method to eliminate span center direct flashover, wherein: the pre-ionization discharge system is arranged on the upper electrode or the lower electrode and is respectively connected with a power transmission line or a lightning conductor, a sensor in the pre-ionization discharge system collects lightning wave signals or receives the lightning electromagnetic field signals through space radio induction, the pre-ionization discharge system carries out pre-ionization discharge to generate free electrons and/or sparks, the air gap is in short circuit discharge, and the gap is in short circuit ground connection.
9. The apparatus of claim 8 for full-span insulation fit method to eliminate span center direct flashover, wherein: the pre-ionization discharge system comprises a lightning induction module, a trigger control module, an energy storage module and a pre-ionization module, wherein the lightning induction module is arranged on a power transmission line, a lightning conductor or a cross arm and is used for inducing the surrounding electric field intensity or receiving a lightning electromagnetic field signal through space radio induction; the trigger control module judges the received signal and determines whether to start the energy storage module or not; the energy storage module is used for storing energy for generating preionization; the pre-ionization module utilizes the energy in the energy storage module to carry out pre-ionization discharge, generates a large amount of free electrons and even generates ionization spark discharge.
10. The apparatus of claim 8 for full-span insulation fit method to eliminate span center direct flashover, wherein: when the span center is struck by lightning, the time for short circuit of an electric arc between a lightning conductor and a lead or between lead phases is far longer than the time for transmitting lightning overvoltage to a tower from a lightning point along the lightning conductor or the lead, after the air gap is firstly punctured, the lightning conductor and the lead are equipotential and are rapidly transmitted to the span center lightning point, so that the lightning point is equipotential, the lightning potential is rapidly returned to zero, and flashover of the span center is avoided.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910537325.6A CN112117070B (en) | 2019-06-20 | 2019-06-20 | Full-span insulation matching method and device for eliminating span central direct flashover |
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| CN201910537325.6A CN112117070B (en) | 2019-06-20 | 2019-06-20 | Full-span insulation matching method and device for eliminating span central direct flashover |
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| CN112117070A CN112117070A (en) | 2020-12-22 |
| CN112117070B true CN112117070B (en) | 2022-03-08 |
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| CN201910537325.6A Active CN112117070B (en) | 2019-06-20 | 2019-06-20 | Full-span insulation matching method and device for eliminating span central direct flashover |
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