CN111863521B - SF6 quick circuit breaker - Google Patents
SF6 quick circuit breaker Download PDFInfo
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- CN111863521B CN111863521B CN202010528453.7A CN202010528453A CN111863521B CN 111863521 B CN111863521 B CN 111863521B CN 202010528453 A CN202010528453 A CN 202010528453A CN 111863521 B CN111863521 B CN 111863521B
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- 230000005540 biological transmission Effects 0.000 claims abstract description 26
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- 229910018503 SF6 Inorganic materials 0.000 claims description 121
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- 238000003780 insertion Methods 0.000 claims description 13
- 230000037431 insertion Effects 0.000 claims description 13
- 230000006835 compression Effects 0.000 claims description 11
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 3
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 2
- 230000001052 transient effect Effects 0.000 abstract description 15
- 238000010586 diagram Methods 0.000 description 9
- 230000006872 improvement Effects 0.000 description 9
- 239000000872 buffer Substances 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
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- 230000009467 reduction Effects 0.000 description 2
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- 238000001514 detection method Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
- H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
- H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
- H01H33/91—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/42—Driving mechanisms
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Abstract
The invention discloses an SF6Quick circuit breaker is applicable to 550kV high tension alternating current transmission line, its characterized in that includes: the moving contact, the static contact and the operating mechanism; the operating mechanism is connected with the moving contact and used for driving the moving contact and the fixed contact to be switched off; at the SF6In the opening process of the quick breaker, the operating mechanism drives the moving contact to move at a preset opening speed so as to enable the SF to move at the preset opening speed6The precompression time of the fast circuit breaker is less than 8.8 ms; the SF6The short arcing time of the fast circuit breaker is less than 9.3 ms. By adopting the embodiment of the invention, the precompression time and the arcing time in the brake separating process can be effectively reduced, and the full on-off time of the device can be effectively reduced, so that the fault removing time of the power system is reduced, the transient stability limit of the power system is greatly improved, and the power transmission capacity of the alternating current transmission line of the power system and the stability of the power system are improved.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to an SF6A quick circuit breaker.
Background
In the actual operation of a power distribution network, the power transmission capacity of an alternating current transmission line is mainly limited by two aspects of thermal stability constraint of the line and transient stability constraint of a power system. The transient stability of the power system refers to the capability of each generator to keep synchronous operation and transition to a new state or recover to obtain an original stable operation state after the power system is subjected to large interference. At present, a 500kV alternating current transmission line in a distribution network range has the condition that more transient stability limits are lower than thermal stability limits. Meanwhile, the power system is easy to cause transient instability of the power grid when a fault occurs. For the condition that the transient stability limit is lower than the thermal stability limit, the power transmission capacity of the alternating current power transmission line is determined by the transient stability limit, and the lower transient stability limit of the system weakens the power transmission capacity of the power transmission line to a certain extent.
At present, for a 500kV high-voltage alternating-current transmission line, the rapid protection fault clearing time adopted in simulation calculation comprises the on-off time of a circuit breaker switch of 50ms, and the relay protection fault detection, judgment and export time is about 35ms in total. In the process of implementing the invention, the inventor finds that the prior art has at least the following problems: the fault clearing time of the current specified power transmission line is long, the deterioration of the transient stability characteristic of a power system in the fault and recovery process is accelerated, the fault clearing time is a key reason for low transient stability limit, and the power transmission capacity of the alternating current power transmission line is greatly limited.
Disclosure of Invention
The purpose of the embodiment of the invention is to provide SF6The quick circuit breaker can effectively reduce the on-off time of the quick circuit breaker, thereby reducing the fault clearing time of a power system, greatly improving the transient stability limit of the power system, and improving the power transmission capacity of a power transmission line and the stability of the power system.
To achieve the above object, embodiments of the present invention provide an SF6Quick circuit breaker is applicable to 550kV high tension alternating current transmission line, includes: the moving contact, the static contact and the operating mechanism; the operating mechanism is connected with the moving contact and used for driving the moving contact and the fixed contact to be switched off;
at the SF6In the opening process of the quick breaker, the operating mechanism drives the moving contact to move at a preset opening speed so as to enable the SF to move at the preset opening speed6The precompression time of the fast circuit breaker is less than 8.8 ms; the SF6The short arcing time of the quick circuit breaker is less than 9.3 ms; wherein the pre-compression time is the SF6The time period that the moving contact of the quick circuit breaker moves from the switching-on position to the switching-off position; the rigid separation position is that the moving contact is in contact with the static contactThe position of head disconnection.
As an improvement of the above scheme, the operating mechanism drives the moving contact to move at a preset opening speed, so that the SF can move at the preset opening speed6The precompression time of the fast circuit breaker is 4 ms; the SF6The short arcing time of a fast circuit breaker is 7 ms.
As an improvement of the above, when said SF is used6When the quick breaker is in a closing state, the SF6The insertion amount of a moving contact of the quick circuit breaker in the fixed contact is set to be 33 mm.
As an improvement of the above, in said SF6And in the pre-compression time of the quick circuit breaker, the operating mechanism drives the moving contact to move, so that the rigid-minute speed of the moving contact when the moving contact reaches the rigid-minute position is 13 m/s.
As an improvement of the above, the SF6And the long arcing time of the quick circuit breaker is determined according to the short arcing time and a preset arcing time difference value.
As an improvement of the above, in said SF6In the short arcing time of the rapid circuit breaker, the opening speed of the moving contact is determined according to the short arcing time and a preset short arcing displacement value.
As an improvement of the above, the SF6In the time period from the end of short arcing time to the end of long arcing time, the opening speed of the moving contact of the rapid breaker is determined according to the long arcing time and a preset long arcing displacement value.
As an improvement of the above, the SF6The quick breaker adopts a three-break structure.
As an improvement of the above, the SF6The quick breaker also comprises a pressure cylinder; the length of the air cylinder is based on the SF6The stroke of the moving contact of the quick breaker in the opening process and the diameter of the air cylinder are determined.
As an improvement of the above, the SF6SF in fast circuit breaker6The absolute pressure of the gas was 0.65 MPa.
Compared with the prior art, the SF disclosed by the invention6Fast circuit breaker, compared to conventional SF6A circuit breaker for realizing the SF by reducing the insertion amount of the moving contact and improving the opening speed of the moving contact as a whole6The precompression time of the fast circuit breaker is less than 8.8ms, said SF6The short arcing time of the quick circuit breaker is less than 9.3ms, so that the precompression time and the arcing time in the brake separating process are effectively reduced, and the SF is effectively reduced6Full on-off time of the fast breaker. At the same time, by increasing SF appropriately6The inflation pressure of the gas is designed by adopting a three-fracture structure, so that the SF is ensured6The fast circuit breaker can be successfully opened. By adopting the embodiment of the invention, SF can be effectively reduced6The full on-off time of the quick circuit breaker is shortened, so that the fault clearing time of the power system is shortened, the transient stability limit of the power system is greatly improved, and the power transmission capacity of an alternating current transmission line of the power system and the stability of the power system are improved.
Drawings
FIG. 1 shows an example of SF in an embodiment of the present invention6A partial structure schematic diagram of the quick circuit breaker;
FIG. 2 shows SF in an embodiment of the present invention6The position schematic diagram of a moving contact of the quick breaker in the switching-on and switching-off process;
FIG. 3 shows a conventional SF6The characteristic curve diagram of the opening speed and the stroke of the circuit breaker is shown;
FIGS. 4(a) and 4(b) are SF data in an embodiment of the present invention6The characteristic curve schematic diagram of the opening speed and the stroke of the rapid circuit breaker under different strokes;
FIG. 5 shows SF in an embodiment of the present invention6The characteristic curve diagram of the pressure and the stroke of the air cylinder of the quick breaker is shown.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides an SF6A fast circuit breaker, suitable for 550kV high-voltage alternating current transmission line, is provided by embodiment 1 of the invention, referring to FIG. 16The partial structure of the quick breaker is shown schematically. The SF6The quick circuit breaker comprises a moving contact, a fixed contact and an operating mechanism; the operating mechanism is connected with the moving contact and used for driving the moving contact and the fixed contact to be switched off; the operating mechanism comprises an insulating pull rod.
SF6The working principle of the circuit breaker is as follows: at the SF6In the process of opening the quick breaker, the operating mechanism drives the moving contact to move through the insulating pull rod, and the SF6SF in puffer cylinders of fast circuit breakers6After the (sulfur hexafluoride) gas is compressed and the moving contact is separated from the static contact, the compressed SF6The gas rushes out of the nozzle, and an arc extinguishing chamber of the circuit breaker obtains ideal gas blowing pressure, so that the electric arc is extinguished.
Referring to FIG. 2, it is SF in the example of the present invention6The position schematic diagram of the moving contact of the quick breaker in the breaking process. The SF6The full on-off time of the quick circuit breaker consists of opening time and arcing time, the opening time consists of mechanism action time and precompression time, the precompression time is SF6The time period that the moving contact of the quick circuit breaker moves from the switching-on position to the switching-off position; the rigid-split position is a position where the moving contact is disconnected from the fixed contact. The arcing time is divided into short arcing time and long arcing time, the long arcing time comprises the short arcing time, and the arcing time refers to the time period from the beginning of arcing to the final arcing of the circuit breaker.
In the existing SF6In the circuit breaker, see fig. 3, is a conventional SF6The characteristic curve of the opening speed and the stroke of the circuit breaker is shown schematically. The conventional LW-550/Y5000-63 type circuit breaker adopts a double-break design, the stroke of a moving contact is 200mm, the insertion quantity of the contact is 58mm, and the opening is openedThe pitch was 142 mm. The SF6In the process that the moving contact of the circuit breaker moves to the just-opened position from the receiving of the opening command, the opening speed is gradually increased. When the moving contact reaches the just-separating position, the separating speed, namely the just-separating speed, reaches 9.5m/s, and the separating time is 17.5ms (including the mechanism action time of 8.7ms and the pre-compression time of 8.8 ms). Just after reaching the split position, conventional SF6The moving contact and the fixed contact of the circuit breaker are separated, the opening speed of the moving contact is gradually reduced, and in the process, the conventional SF6The short arcing time of the circuit breaker is 9.3ms, the long arcing time is 19.4ms, and the total breaking time of the circuit breaker is 36.9 ms. Conventional SF6In the process of opening and closing the circuit breaker, the time for moving the movable contact from the switching-on position to the switching-off position is composed of pre-compression time, arcing time and post-arc movement time. Conventional SF6The breaker has long full-on-off time, so that the fault clearing time of the alternating-current transmission line of the power system is long, the deterioration of the transient stability characteristic of the power system in the fault and recovery process is accelerated, and the power transmission capacity of the alternating-current transmission line of the power system is greatly limited.
In order to solve the above problem, an embodiment of the present invention provides an SF6Fast circuit breaker of said SF6In the opening process of the quick circuit breaker, the operating mechanism drives the moving contact to move at a preset opening speed so as to enable the SF to move at the preset opening speed6The precompression time of the fast circuit breaker is less than 8.8 ms; the SF6The short arcing time of the fast circuit breaker is less than 9.3 ms. In the embodiment of the invention, SF can be controlled by adjusting the operating mechanism6Driving force of the fast breaker, so that the SF is used for the whole brake-separating process6The opening speed of the moving contact of the quick circuit breaker in each unit time is higher than that of the conventional SF6The opening speed of the circuit breaker, thereby reducing the SF6Pre-compression time and short arcing time of a fast circuit breaker to reduce the SF6Full off time of the fast breaker.
As a preferred embodiment, the operating mechanism drives the movable contact to move at a preset opening speed, so that the SF is enabled to move at the preset opening speed6The precompression time of the fast circuit breaker is 4 ms; the SF6The short arcing time of a fast circuit breaker is 7 ms.
Too small a precompression time and a short arcing time will not guarantee the SF6Successful opening of a fast circuit breaker, while too high precompression times and short arcing times do not allow a reduction of the SF6The effect of the full off time of the fast circuit breaker. Thus, by applying to said SF6The opening speed of the quick breaker in the opening process is adjusted, and finally the SF is realized6The precompression time of the fast circuit breaker is adjusted to a target value of 4ms, and the short arcing time is adjusted to a target value of 7ms, which can ensure the SF6Successful breaking of a fast circuit breaker in practical applications and enabling reduction of said SF6The beneficial effect of the full off time of the quick circuit breaker.
Furthermore, the embodiment of the invention adjusts the SF6The moving contact insertion amount and the opening speed of the quick circuit breaker are reduced to reduce the pre-compression time and the short arcing time, so that the SF is ensured to be6The precompression time of the fast circuit breaker is 4ms, SF6The short arcing time of a fast circuit breaker is 7 ms.
In particular, when the SF is6When the quick breaker is in a closing state, the SF is added6The contact insertion amount of a moving contact of the quick circuit breaker in the static contact is adjusted to be less than the conventional SF6The contact insertion amount of the circuit breaker is adjusted to be less than 58 mm. And, in the SF6In the opening process of the quick breaker, the SF is enabled to be controlled by adjusting the driving force of the operating mechanism6The rigid-separation speed of the moving contact of the quick circuit breaker is greater than the conventional SF6And the rigid-separation speed of the breaker, namely the rigid-separation speed of the movable contact is adjusted to be less than 9.5 m/s. Determining the SF according to the insertion amount and the rigid division speed of the contact6The opening speed of a movable contact of the quick circuit breaker in a pre-compression time period is calculated to obtain an opening speed characteristic curve of v ═ f (t), so that the SF in the pre-compression time period6The opening speed of the moving contact of the quick circuit breaker in each unit time is equalHigher than conventional SF6The opening speed of the breaker and the SF is driven by the operating mechanism6The moving contact of the fast circuit breaker moves at a corresponding opening speed, thereby shortening the pre-compression time.
As a preferred embodiment, when said SF is used6When the quick breaker is in a closing state, the SF6The insertion amount of a moving contact of the quick circuit breaker in the fixed contact is set to be 33 mm.
In a preferred embodiment, the SF is6And in the pre-compression time of the quick circuit breaker, the moving contact is driven to move by the operating mechanism, so that the rigid-dividing speed of the moving contact when the moving contact reaches the rigid-dividing position is 13 m/s.
By adopting the technical means of the embodiment of the invention, the SF is obtained6The insertion amount of a moving contact of the quick circuit breaker is adjusted to 33mm, and the SF is added6The rigid-breaking speed of the quick breaker is adjusted to 13m/s, so that the SF can be ensured6The precompression time of the fast circuit breaker is shortened to 4 ms. Compared with the conventional SF6Circuit breaker of said SF6The full on-off time of the fast circuit breaker is obviously reduced.
When the SF is used6After the insertion amount of the moving contact of the quick circuit breaker is adjusted to 33mm, the SF can be kept6The opening distance of the quick breaker is conventional SF6The opening distance of the circuit breaker is not changed at 142mm, then the SF6The stroke of the quick breaker is correspondingly adjusted to 175 mm; the SF can also be maintained6The stroke of the fast breaker is conventional SF6The stroke of the circuit breaker is not changed by 200mm, then the SF6The opening distance of the quick breaker is correspondingly adjusted to 167mm, and the beneficial effects of the invention are not affected.
Referring to FIGS. 4(a) and 4(b), SF in the examples of the present invention6The characteristic curve diagram of the opening speed and the stroke of the quick circuit breaker under different strokes is shown. Wherein, FIG. 4(a) shows the SF6The characteristic curve diagram of the opening speed and the stroke of the rapid circuit breaker keeps the stroke of 200mm unchanged; FIG. 4(b) shows the SF6The quick breaker keeps the opening distance to be 142mm unchanged and alsoNamely, the characteristic curve of the opening speed and the stroke under the condition of adjusting the stroke to 175mm is shown. With conventional SF6Compared with a circuit breaker, the SF provided by the embodiment of the invention6The moving contact of the quick circuit breaker has higher opening speed in the precompression time period and reaches the rigid opening speed of 13m/s at the rigid opening position, and the precompression time is obviously shortened.
Further, the embodiment of the invention enables the SF to be used in a short arcing time period6The opening speed of the moving contact of the quick circuit breaker per unit time is adjusted to be less than the conventional SF6The opening speed of the circuit breaker, thereby shortening the short arcing time. In particular, in said SF6In the short arcing time of the rapid circuit breaker, the opening speed of the moving contact is determined according to the short arcing time and a preset short arcing displacement value. Wherein the preset short-burning arc displacement value adopts conventional SF6Short arcing displacement value of circuit breaker, namely displacement of moving contact in short arcing time period and conventional SF6The displacements of the circuit breakers are uniform.
According to SF6Short arcing time of a fast circuit breaker is a 7ms target value, in combination with said short arcing displacement value, and said SF6Determining the SF at a fast speed of 13m/s6The opening speed of a moving contact of the quick circuit breaker in the short-time arcing displacement process is calculated to obtain an opening speed characteristic curve of v ═ f (t), and the SF is driven through the operating mechanism6The moving contact of the quick circuit breaker moves at a corresponding opening speed, so that the SF6The opening speed of the moving contact of the quick circuit breaker in each unit time in the short arcing displacement is less than the conventional SF6The opening speed of the circuit breaker is finally realized by the SF6The short arcing time of the fast circuit breaker is reduced to the effect of 7 m/s.
See FIGS. 4(a) and 4(b) for comparison with conventional SF6Compared with a circuit breaker, the SF6The moving contact of the rapid circuit breaker has higher opening speed in a short arcing time period, and the short arcing time is obviously shortened. By adopting the technical means of the embodiment of the invention, the SF is adjusted6Short arcing of moving contact of quick circuit breakerThe opening speed in the displacement can be made to be equal to the SF6The short arcing time of a fast circuit breaker is shortened to 7 ms. Compared with the conventional SF6Circuit breaker of said SF6The full on-off time of the fast circuit breaker is obviously reduced.
Further, the SF6And the long arcing time of the quick circuit breaker is determined according to the short arcing time and a preset arcing time difference value. In the embodiment of the present invention, if the difference between the arcing times is set to 9ms, it may be determined that the long arcing time is 16 ms. The SF6In the time period from the end of short arcing time to the end of long arcing time, the opening speed of the moving contact of the rapid breaker is determined according to the long arcing time and a preset long arcing displacement value. Wherein the preset long arcing displacement value adopts conventional SF6The displacement value of the long arcing of the circuit breaker, namely under the condition that the displacement value of the short arcing is not changed, the displacement of the moving contact in the long arcing time period is also equal to the conventional SF6The displacements of the circuit breakers are uniform. According to SF6The long arcing time of the fast circuit breaker is a 16ms target value, and the SF is determined by combining the long arcing displacement value6The opening speed of a moving contact of the quick circuit breaker is calculated to obtain an opening speed characteristic curve of v ═ f (t), and the SF is driven through the operating mechanism6The moving contact of the quick breaker moves at a corresponding opening speed.
It should be noted that after the short arcing time is over, an excessive opening speed may cause the moving contact to reach the opening end point in advance, so that the zero-back arc blowing capability is too weak or lost, and therefore, the opening buffer should be put into operation from the time when the short arcing time is over, so as to compress the opening speed. Referring to FIGS. 4(a) and 4(b), the SF6The opening speed of the quick circuit breaker from the moment when the short arcing time is finished is obviously reduced, thereby ensuring SF6The arc blow capability of a fast circuit breaker. And maintaining sufficient SF in the air cylinder6For this purpose, the post-arc movement time (i.e. the movement time after the end of the long arcing time) should be greater than 3 ms.
After the technical means of the embodiment of the invention is adopted, the SF6Quick circuit breakerThe total on-off time of the system is reduced to about 24ms, and the SF is used in the operation process of the power system6The quick circuit breaker can effectively reduce the fault clearing time of the power system, and the transient stability limit of the power system is greatly improved.
Referring to FIGS. 4(a) and 4(b), in the SF6Under the condition that the stroke of the quick circuit breaker is kept unchanged at 200mm, the SF can be obtained6The average opening speed of the fast breaker is about 7.81m/s, while at the SF6The SF can be obtained under the condition that the opening distance of the quick breaker is kept to be 142mm, namely the adjusting stroke is 175mm6The average opening speed of the fast breaker is about 7.29 m/s. According to the long-term design experience of mainstream manufacturers on the circuit breaker in the prior art, the average opening speed v of the circuit breakerfDetermined by the following equation:
wherein k is7The non-uniform coefficient of the electric field of the arc extinguish chamber fracture is 2.6 for a 550kV circuit breaker; u shapenThe rated voltage of the equipment; e1Circuit breaker at SF6The allowable lightning impulse field strength (kV/mm) when the air pressure is locked is operated. According to design experience, for a 550kV circuit breaker, the value is 29 under the operation locking air pressure of 0.5 MPa; t is takIs the minimum time (ms) required from the moment of arcing to the moment of recovery voltage rising to the peak, which value takes 13.7 for a circuit breaker of 550 kV. The average opening speed v of the circuit breaker can be obtained by calculationfIt was 8.87 m/s.
Therefore, the optimized average opening speed of the circuit breaker is required to be [8.87m/s +/-delta vf]And (5) controlling. Δ vfThe difference can be determined according to the practical application of the circuit breaker, such as setting delta vf2 m/s. The SF provided by the embodiment of the invention6The average opening time of the rapid circuit breaker meets the average opening speed range of the circuit breaker obtained by long-term design experience of mainstream manufacturers on the circuit breaker in the prior art, so that the fracture can be ensured to be enough when small capacitance current (equivalent to cold state) is cut offThe medium of (2) can recover the strength, and simultaneously ensures that when a near zone fault (SFL) is cut off, the fracture has enough medium heat recovery speed corresponding to short arcing time.
Further, as a preferred embodiment, the SF6The quick breaker adopts a three-break structure.
SF6The contact opening of the circuit breaker is related to the capacity of static withstand voltage between the fractures at the opening position and also related to the arc quenching distance necessary for various opening. During design, the average brake-separating speed v should be consideredfAnd the expected maximum arcing time t at various cut-offsacThe determined longest arc-quenching distance requirement, open distance lkThe following requirements should be satisfied:
lk≥vf(tac+3ms)；
SF provided according to embodiments of the invention6Calculating the longest arcing time and average brake-separating speed of the fast breaker to obtain the opening distance lkShould be greater than 218 mm. SF for embodiments of the present invention because the voltage level is unchanged6The insulation level of the quick circuit breaker does not need to be raised. Therefore, the requirement of the static withstand voltage capability of the fracture on the opening distance at the brake-separating position adopts the conventional SF6The opening distance of the circuit breaker is required. The contact opening distances in the embodiment of the invention are respectively 142mm and 167mm, and in order to make up for the insufficient arc extinguishing distance during the breaking, the two fractures of the circuit breaker are increased to a three-fracture design, so that the arc extinguishing capability of the circuit breaker is improved.
Further, the SF6The length of the puffer cylinder of the quick breaker is based on the SF6The stroke of the moving contact of the quick breaker in the opening process and the diameter of the air cylinder are determined.
Specifically, the volume of the air cylinder and the matching of the air cylinder and the opening characteristic have important significance for ensuring the successful opening and closing of the circuit breaker. Enough SF can be maintained by the pressure cylinder after the arc extinguishing of the circuit breaker6Gas, arc blow to ensure continuous pressure, said SF provided by embodiments of the present invention6The residual gas amount of the pressing cylinder of the quick breaker needs to be equal to the conventional SF after the breaking is in place6Breaker opening in-place rear pressure cylinderThe amount of residual gas remained consistent. Conventional SF6The length of the puffer cylinder of the circuit breaker is set to 228.5 mm. For this reason, under the premise of not changing the diameter of the air cylinder, when the stroke of the movable contact is determined to be 200mm, the SF6The length of a pressure cylinder of the quick breaker is set to be 228.5 mm; when the stroke of the movable contact is determined to be 175mm, the SF6The length of the puffer cylinder of the quick breaker is set to 203.5 mm. By adopting the technical means of the embodiment of the invention and combining the strokes under different schemes, the length of the air cylinder in different schemes is changed, so that after the final brake opening is in place, the air cylinder is left with 28.5 mm-long SF6The amount of gas.
Further, as a preferred embodiment, the SF6SF in fast circuit breaker6The absolute pressure of the gas was 0.65 MPa. The circuit breaker after optimizing needs to guarantee that it possesses the function of breaking, and the circuit breaker breaking in-process is mainly through compressed SF of air cylinder compression6The strong gas generated by the gas blows to extinguish the arc. Conventional SF6The inflation pressure of the circuit breaker is 0.60MPa, and the SF provided by the embodiment of the invention6After the contact insertion amount and the opening speed of the quick breaker are adjusted, the air pressure change and the conventional SF are ensured in the whole breaking process6The pressure change of the circuit breaker is similar, and the SF is required to be used6SF in fast circuit breaker6The absolute pressure of the gas is adjusted to 0.65MPa, thereby ensuring the SF6The quick circuit breaker can achieve better arc blowing effect and ensure SF6The on-off function of the quick breaker.
Referring to FIG. 5, it is SF in the example of the present invention6The characteristic curve diagram of the pressure and the stroke of the air cylinder of the quick breaker is shown. SF of the present example6Combined scheme of quick circuit breaker at different strokes and different inflation pressures, and conventional SF6The design of the circuit breaker is compared. Wherein, the first scheme represents SF in the embodiment of the invention6The design scheme that the stroke of the quick circuit breaker is 200mm and the inflation pressure is 0.60MPa is adopted, and scheme II shows SF in the embodiment of the invention6The stroke of the quick circuit breaker is 175mm, the inflation pressure is 0.60MPa, and the third scheme shows the inventionSF in the examples6The stroke of the quick circuit breaker is 200mm, the inflation pressure is the design scheme of 0.65MPa, and the scheme IV shows SF in the embodiment of the invention6The stroke of the quick breaker is 175mm, and the inflation pressure is 0.65 MPa. Dots on a conventional design curve in the figure sequentially represent the moment just divided, the moment when a small nozzle is opened, the moment when a large nozzle is reached, the moment when a theoretical short arc is extinguished and the moment when a theoretical long arc is extinguished from left to right in the conventional design. From FIG. 5, it can be seen that the SF obtained for the case three (stroke 200mm, inflation pressure 0.65MPa) and the case four (stroke 175mm, inflation pressure 0.65MPa)6The air pressure change of the rapid breaker in the whole breaking process is similar to that of the conventional design, and the pressure intensity of the pressure chamber is higher than that of the conventional design at the arc extinguishing moments of long and short arcing, so that a better arc blowing effect can be achieved.
In summary, the preferred SF provided by the embodiments of the present invention6Design parameters of the fast circuit breaker are as shown in table 1:
TABLE 1 SF6Design scheme parameters of fast circuit breaker
The embodiment of the invention provides SF6Fast circuit breaker, compared to conventional SF6A circuit breaker for realizing the SF by reducing the insertion amount of the moving contact and improving the opening speed of the moving contact as a whole6The precompression time of the fast circuit breaker is less than 8.8ms, said SF6The short arcing time of the quick circuit breaker is less than 9.3ms, so that the precompression time and the arcing time in the brake separating process are effectively reduced, and the SF is effectively reduced6Full off time of a fast breaker. At the same time, by increasing SF appropriately6The inflation pressure of the gas is designed by adopting a three-fracture structure, so that the SF is ensured6The fast circuit breaker can be successfully opened. By adopting the embodiment of the invention, SF can be effectively reduced6The full on-off time of the quick circuit breaker is shortened, so that the fault removal time of the power system is reduced, and the power system is greatly improvedThe transient stability limit of the power system improves the power transmission capacity of the alternating current transmission line of the power system and the stability of the power system.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (8)
1. SF (sulfur hexafluoride)6Quick circuit breaker is applicable to 550kV high tension AC transmission line, its characterized in that includes: the moving contact, the static contact and the operating mechanism; the operating mechanism is connected with the moving contact and used for driving the moving contact and the fixed contact to be switched off;
at the SF6In the opening process of the quick breaker, the operating mechanism drives the moving contact to move at a preset opening speed so as to enable the SF to move at the preset opening speed6The precompression time of the fast circuit breaker is less than 8.8ms, said SF6The short arcing time of the quick circuit breaker is less than 9.3 ms; wherein the pre-compression time is the SF6The time period that the moving contact of the quick circuit breaker moves from the switching-on position to the switching-off position; the rigid-split position is a position at which the moving contact is disconnected from the fixed contact;
the operating mechanism drives the moving contact to move at a preset opening speed so as to enable the SF to move6The precompression time of the fast circuit breaker is 4 ms; the SF6The short arcing time of the quick circuit breaker is 7 ms;
when the SF is6When the quick breaker is in a closing state, the SF6The insertion amount of a moving contact of the quick circuit breaker in the fixed contact is set to be 33 mm.
2. The SF according to claim 16Fast circuit breaker, characterized in that said SF6And in the pre-compression time of the quick circuit breaker, the operating mechanism drives the moving contact to move, so that the rigid-minute speed of the moving contact when the moving contact reaches the rigid-minute position is 13 m/s.
3. The SF according to claim 16Fast circuit breaker, characterized in that said SF6And the long arcing time of the quick circuit breaker is determined according to the short arcing time and a preset arcing time difference value.
4. The SF according to claim 16Fast circuit breaker, characterized in that said SF6The short arcing time of the rapid circuit breaker and the opening speed of the moving contact are determined according to the short arcing time and a preset short arcing displacement value.
5. The SF according to claim 46Fast circuit breaker, characterized in that said SF6In the time period from the end of short arcing time to the end of long arcing time, the opening speed of the moving contact of the rapid breaker is determined according to the long arcing time and a preset long arcing displacement value.
6. SF according to any of claims 1 to 56Fast circuit breaker, characterized in that said SF6The quick breaker adopts a three-break structure.
7. The SF according to claim 16Fast circuit breaker, characterized in that said SF6The quick circuit breaker also comprises a pressure cylinder; the length of the air cylinder is based on the SF6The stroke of the moving contact of the quick breaker in the opening process and the diameter of the air cylinder are determined.
8. The SF of claim 76Fast circuit breaker, characterized in that said SF6SF in fast circuit breaker6The absolute pressure of the gas was 0.65 MPa.
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| CN111863521A (en) | 2020-10-30 |
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