CN109672162B - GIS equipment and VFTO suppression device thereof - Google Patents
GIS equipment and VFTO suppression device thereof Download PDFInfo
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- CN109672162B CN109672162B CN201910064543.2A CN201910064543A CN109672162B CN 109672162 B CN109672162 B CN 109672162B CN 201910064543 A CN201910064543 A CN 201910064543A CN 109672162 B CN109672162 B CN 109672162B
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- 230000007704 transition Effects 0.000 claims abstract description 139
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- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000000452 restraining effect Effects 0.000 abstract description 12
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- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 239000011324 bead Substances 0.000 description 3
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- 230000005415 magnetization Effects 0.000 description 3
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
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Abstract
The invention relates to the technical field of power equipment, and particularly provides a VFTO restraining device and GIS equipment using the VFTO restraining device. The VFTO suppression device comprises conducting rods which are arranged at intervals along the axial direction of the VFTO suppression device, at least two branch conductors are arranged between the conducting rods in parallel, a magnetic ring string group is sleeved on the peripheral surface of each branch conductor, transition rings which are matched with corresponding magnetic ring blocks and used for positioning the magnetic ring string group are arranged at two ends of the magnetic ring string group, resistance cylinders are sleeved on the outer side surfaces of the magnetic ring string group and the transition rings, the inner ring surface of each transition ring is fixed with the corresponding branch conductor and is in contact conduction, and the surface of each transition ring is fixed with the corresponding resistance cylinder and is in contact conduction. The VFTO restraining device can solve the problem that in the prior art, the conducting rod and the resistor are complex to process and assemble.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to GIS equipment and a VFTO restraining device thereof.
Background
Each operation of the isolating switch in a gas insulated metal enclosed switchgear (GIS) is carried out for dozens of times or even hundreds of times, the voltage at two ends of a contact gap suddenly drops within a few ns, and voltage steep waves continuously generate traveling waves in the GIS, so that complicated refraction, reflection and superposition are carried out, and Very Fast Transient Overvoltage (VFTO) is generated. VFTO is a special overvoltage that has three main features: one is frequency bandwidth (from zero to hundreds of MHz); secondly, the steepness is large (the rising time can be as low as several ns); third, the amplitude is high (up to 3 p.u.).
The VFTO has an important influence on the safe operation of the GIS device, the external connection device, and the secondary device, and along with the improvement of the system voltage level, the influence is more and more significant, and is particularly prominent in an extra-high voltage system. Therefore, for safe and stable operation of the power system, reliable measures must be taken to suppress VFTO in the extra-high voltage GIS.
In the prior art, the ferrite magnetic ring can effectively inhibit VFTO, and the installation of the high-frequency magnetic ring in the GIS loop is an economic and reliable method for solving the problem of VFTO. However, the magnetic permeability of the high-frequency magnetic ring changes along with the change of the magnetic field intensity, and when the ferrite material tends to be saturated, the incremental magnetic permeability tends to be zero. That is, in the saturation case, the effect of the ferrite high frequency magnetic ring to suppress VFTO will disappear. In a GIS in actual engineering, the traveling wave current of VFTO can reach thousands of amperes, and under the traveling wave current, the magnetic ring is seriously saturated and the capacity of restraining the gradient and amplitude of the traveling wave is lost, so that effective measures are required to be taken, the magnetic ring is prevented from being seriously saturated, and the suppression reliability of the VFTO is ensured.
Increasing the number of magnetic rings can partially offset the saturation effect, but the number of magnetic rings installed in practical engineering cannot be infinite for the following reasons: firstly, increasing the number of magnetic rings can increase the equipment cost, secondly, the compact structure of GIS has restricted the installation quantity of magnetic rings, consequently, excessively increasing the number of magnetic rings is not the good way of solving the magnetic ring saturation problem.
The biggest limiting factor of the magnetic ring for inhibiting VFTO is the influence of saturation effect. The ferrite bead may be approximately equivalent to an electrical component with a nonlinear inductance and resistance in parallel. When VFTO is generated, the gradient of traveling wave is reduced by the nonlinear inductor, and the amplitude of the traveling wave is reduced by the resistor.
With the rise of the traveling wave current, the magnetic conductivity of the magnetic material tends to be saturated, the magnetic conductivity is reduced, the equivalent inductance of the magnetic ring is reduced, and the inhibition effect on VFTO is weakened. For the saturation behaviour, the Langevin function can be used to model the static magnetization curve of a magnetic material:
wherein M issIs the saturation magnetization, mu0Is the magnetic permeability of vacuum, muiIs the initial relative permeability. Eddy current characteristics, characterized by resistivity ρ. For example, a ferrite bead of type R2KB, with a saturation magnetization of 0.5T, an initial permeability of 2500, and a resistivity of 0.03 Ω · m, assuming a bead thickness of 15mm, an inner diameter of 120mm, and an outer diameter of 160 mm.
Taking the ferrite magnetic ring as an example for estimation, under the condition of direct current, 100A current is introduced into a conducting rod of the GIS, and critical saturation is achieved; at transient currents, the current required to reach saturation increases due to the demagnetization effect of eddy currents. The magnetic ring has a certain attenuation effect on the pulse traveling wave current, and the critical saturation current of the ferrite magnetic ring under VFTO is estimated to be in the order of magnitude of 1 kA.
The extra-high voltage GIS wave impedance is generally 70-100 ohms, estimated according to peak-to-peak breakdown voltage 1800kV, after breakdown, the first pulse amplitude is 900kV, the amplitude of the generated pulse current can reach about 10kA, and thus the magnetic ring is difficult to work in a linear region under the transient current with high amplitude.
When the magnetic ring is applied to an extra-high voltage GIS, the saturation of magnetic materials is inevitable. The magnetic ring saturation effect can greatly weaken the effect of inhibiting the VFTO, even lose the capacity of inhibiting the VFTO under the condition of large traveling wave current, and the magnetic ring inhibits the maximum toggle of the VFTO and is the influence of saturation, so an economic, effective and reliable device is required to be provided to reduce the traveling wave current passing through the magnetic ring, thereby limiting and even avoiding the saturation effect of the magnetic ring and ensuring the reliability of the magnetic ring in inhibiting the VFTO.
A technical document named 'simulation research on a high-frequency magnetic ring and damping resistor for inhibiting VFTO of an extra-high voltage GIS' is disclosed in an international meeting statement of extra-high voltage transmission technology in 2009, in this technical document a method is proposed for jointly suppressing VFTO with a high frequency magnetic ring and a damping resistor, a high-frequency magnetic ring string is arranged on a high-voltage conducting rod of the GIS, and a cylindrical damping resistor is arranged outside the magnetic ring string, so that a coaxial structure is formed, the frequency is lower, the influence of the high-frequency magnetic ring string and the damping resistor is less, the current mainly passes through the conducting rod, for VFTO, the reactance of the conducting rod is obviously increased by the high-frequency magnetic ring, so that the damping resistance of the high-frequency current channel generates attenuation. The high-frequency magnetic ring and the damping resistor can damp refraction and reflection of GIS bus uplink waves, high-frequency components in the VFTO are restrained, and the amplitude and the gradient of the VFTO are reduced.
As shown in fig. 1, which is a schematic structural diagram of a high-frequency magnetic ring and a damping resistor matched with a conducting rod disclosed in the technical document, the conducting rod 101 is in a long rod shape, an assembly ring groove arranged around an axis of the conducting rod is formed in an outer peripheral surface of the conducting rod 101, a magnetic ring string group 102 is sequentially arranged in the ring groove from inside to outside, a cylindrical damping resistor, namely a resistor cylinder 103, is sleeved on an outer peripheral surface of the magnetic ring string group 102, and the damping resistor abuts against two groove walls of the assembly ring groove along a length direction of the conducting rod 101, so that the conducting rod 101 is conducted with the resistor cylinder 103. But there are problems in that: the assembly ring groove machined on the conducting rod 101 is complex, and the conducting rod 101 and the resistor cylinder 103 are not convenient to assemble.
Disclosure of Invention
The invention aims to provide a VFTO restraining device which can solve the problem that a conducting rod and a resistor are complex to process and assemble in the prior art; another object of the present invention is to provide a GIS device using the VFTO suppression apparatus.
In order to achieve the above object, the VFTO suppressing device of the present invention employs a first technical solution as follows:
a VFTO suppression device comprises a conductive rod, wherein a magnetic ring string group is sleeved on the outer peripheral surface of the conductive rod, transition rings matched with corresponding magnetic ring stops to position the magnetic ring string group are arranged at two ends of the magnetic ring string group, a resistor cylinder is sleeved on the outer side surfaces of the magnetic ring string group and the transition rings, the inner ring surface of each transition ring is fixed with the conductive rod and is in contact conduction with the conductive rod to form electric connection, and the outer side surface of each transition ring is fixed with the resistor cylinder and is in contact conduction to form electric connection.
The beneficial effects are that: the transition ring is used for realizing conduction of the on-resistance cylinder and the conducting rod, and the structure is simple. The inner ring surface of the transition ring is in contact with the conducting rod, so that reliable electric contact can be guaranteed, the side surface of the transition ring can position the magnetic ring string, and vibration and noise of the magnetic ring string are reduced. When the magnetic ring is assembled, the transition ring is only required to clamp the magnetic ring string group and then is respectively conducted with the resistance cylinder and the conducting rod correspondingly, and the original structure is not required to be improved excessively.
Further, the resistor cylinder and the transition ring are fixedly connected through bolts arranged along the radial direction of the transition ring.
The beneficial effects are that: the fixed connection of the resistor cylinder and the transition ring is ensured by using the bolts arranged along the radial direction of the transition ring, the structure is simple, the connection is reliable, the bolts are arranged along the radial direction and can be used when a plurality of bolts are used, and the stability and the reliability are further improved.
Further, the bolt is made of a conductive material.
The beneficial effects are that: the bolt is made of conductive materials and plays a role in assisting in conducting electricity.
Further, the conducting rod and the transition ring are fixedly connected through bolts arranged along the radial direction of the transition ring.
The beneficial effects are that: the bolts arranged along the radial direction of the transition ring are used for ensuring the fixed connection of the conducting rod and the transition ring, the structure is simple, the connection is reliable, the bolts are arranged along the radial direction and can be used when a plurality of bolts are used, and the stability and the reliability are further improved.
Further, the bolt is made of a conductive material.
The beneficial effects are that: the bolt is made of conductive materials and plays a role in assisting in conducting electricity.
In order to achieve the above object, the GIS device of the present invention adopts the following first technical solution:
the GIS equipment comprises buses and VFTO restraining devices connected between the buses, wherein each VFTO restraining device comprises a conductive rod, magnetic ring string groups are sleeved on the peripheral surfaces of the conductive rods, transition rings matched with the corresponding magnetic rings in a blocking mode are arranged at two ends of each magnetic ring string group to position the magnetic ring string groups, resistance cylinders are sleeved on the magnetic ring string groups and the outer side surfaces of the transition rings, the inner ring surfaces of the transition rings are fixed with the conductive rods and are in contact conduction to form electric connection, and the outer side surfaces of the transition rings are fixed with the resistance cylinders and are in contact conduction to form electric connection.
The beneficial effects are that: the transition ring is used for realizing conduction of the on-resistance cylinder and the conducting rod, and the structure is simple. The inner ring surface of the transition ring is in contact with the conducting rod, so that reliable electric contact can be guaranteed, the side surface of the transition ring can position the magnetic ring string, and vibration and noise of the magnetic ring string are reduced. When the magnetic ring is assembled, the transition ring is only required to clamp the magnetic ring string group and then is respectively conducted with the resistance cylinder and the conducting rod correspondingly, and the original structure is not required to be improved excessively.
Further, the resistor cylinder and the transition ring are fixedly connected through bolts arranged along the radial direction of the transition ring.
The beneficial effects are that: the fixed connection of the resistor cylinder and the transition ring is ensured by using the bolts arranged along the radial direction of the transition ring, the structure is simple, the connection is reliable, the bolts are arranged along the radial direction and can be used when a plurality of bolts are used, and the stability and the reliability are further improved.
Further, the bolt is made of a conductive material.
The beneficial effects are that: the bolt is made of conductive materials and plays a role in assisting in conducting electricity.
Further, the conducting rod and the transition ring are fixedly connected through bolts arranged along the radial direction of the transition ring.
The beneficial effects are that: the bolts arranged along the radial direction of the transition ring are used for ensuring the fixed connection of the conducting rod and the transition ring, the structure is simple, the connection is reliable, the bolts are arranged along the radial direction and can be used when a plurality of bolts are used, and the stability and the reliability are further improved.
Further, the bolt is made of a conductive material.
The beneficial effects are that: the bolt is made of conductive materials and plays a role in assisting in conducting electricity.
In order to achieve the above object, the VFTO suppressing device of the present invention employs the following second technical means:
a VFTO suppression device comprises conducting rods which are arranged at intervals along the axial direction of the device, at least two branch conductors are arranged between the conducting rods in parallel, a magnetic ring string group is sleeved on the outer peripheral surface of each branch conductor, transition rings which are matched with corresponding magnetic ring blocks are arranged at two ends of the magnetic ring string group to position the magnetic ring string group, resistance cylinders are sleeved on the magnetic ring string group and the outer side surfaces of the transition rings, the inner ring surface of each transition ring is fixed with the corresponding branch conductor and is in contact conduction, and the outer side surfaces of the transition rings are fixed with the resistance cylinders and are in contact conduction.
The beneficial effects are that: the magnetic ring series group is sleeved on the branch conductors, the magnetic ring cannot be saturated due to small traveling wave current, and thus the magnetic ring can stably inhibit VFTO; when the current is introduced into the plurality of branch conductors which are arranged in parallel, the current direction is the same, parasitic inductance can be generated in each branch conductor, the current can be further reduced, the magnetic ring is prevented from being saturated by traveling wave current passing through the magnetic ring, the magnetic ring is also prevented from being influenced by saturation effect, and the reliability of the magnetic ring for inhibiting VFTO is ensured.
The transition ring is used for realizing the conduction of the on-resistance cylinder and the branch conductor, and the structure is simple. The inner ring surface of the transition ring is in contact with the branch conductor, so that reliable electric contact can be guaranteed, the side surface of the transition ring can position the magnetic ring string, and vibration and noise of the magnetic ring string are reduced. When the magnetic ring is assembled, the transition ring is only required to clamp the magnetic ring string group and then is respectively conducted with the resistance cylinder and the conducting rod correspondingly, and the original structure is not required to be improved excessively.
Further, the resistor cylinder and the transition ring are fixedly connected through bolts arranged along the radial direction of the transition ring.
The beneficial effects are that: the fixed connection of the resistor cylinder and the transition ring is ensured by using the bolts arranged along the radial direction of the transition ring, the structure is simple, the connection is reliable, the bolts are arranged along the radial direction and can be used when a plurality of bolts are used, and the stability and the reliability are further improved.
Further, the bolt is made of a conductive material.
The beneficial effects are that: the bolt is made of conductive materials and plays a role in assisting in conducting electricity.
Further, the branch conductor and the transition ring are fixedly connected through bolts arranged along the radial direction of the transition ring.
The beneficial effects are that: the bolts arranged along the radial direction of the transition ring are used for ensuring the fixed connection of the branch conductor and the transition ring, the structure is simple, the connection is reliable, the bolts are arranged along the radial direction and can be used when a plurality of bolts are used, and the stability and the reliability are further improved.
Further, the bolt is made of a conductive material.
The beneficial effects are that: the bolt is made of conductive materials and plays a role in assisting in conducting electricity.
Further, the branch conductors are arranged in parallel between the two conductive rods.
The beneficial effects are that: arranging the branch conductors in parallel enables the current through the conductive rod to be distributed as evenly as possible over the branch conductors, and the parasitic inductance generated between the parallel arranged branch conductors is stronger.
Furthermore, the conducting rod comprises a transition disc which protrudes outwards along the radial direction of the conducting rod and is used for being connected with the branch conductors, and the branch conductors are uniformly distributed on the transition disc.
The beneficial effects are that: be provided with the transition dish on the conducting rod, branch conductor has bigger arrangement space when connecting on the transition dish, and the technical staff of being convenient for can increase the area of contact between conducting rod and the branch conductor with magnetic ring cluster suit on branch conductor to set up the transition dish, make branch conductor can undertake bigger electric current.
Further, the sum of the cross-sectional areas of the branch conductors is larger than the cross-sectional area of the conductive rod.
The beneficial effects are that: the sum of the cross-sectional areas of the branch conductors is larger than the cross-sectional area of the conducting rod, so that the branch conductors can bear the distributed current transmitted by the conducting rod.
In order to achieve the above object, the GIS device of the present invention adopts the following second technical solution:
the GIS equipment comprises buses and VFTO restraining devices connected between the buses, wherein each VFTO restraining device comprises conducting rods arranged at intervals along the axial direction of each VFTO restraining device, at least two branch conductors are arranged between the conducting rods in parallel, a magnetic ring string group is sleeved on the outer peripheral surface of each branch conductor, transition rings matched with corresponding magnetic rings in a blocking mode are arranged at two ends of each magnetic ring string group to position the magnetic ring string groups, resistance cylinders are sleeved on the outer side surfaces of the magnetic ring string groups and the transition rings, the inner ring surfaces of the transition rings are fixed with the branch conductors and are in contact conduction, and the outer side surfaces of the transition rings are fixed with the resistance cylinders and are in contact conduction.
The beneficial effects are that: the magnetic ring series group is sleeved on the branch conductors, the magnetic ring cannot be saturated due to small traveling wave current, and thus the magnetic ring can stably inhibit VFTO; when the current is introduced into the plurality of branch conductors which are arranged in parallel, the current direction is the same, parasitic inductance can be generated in each branch conductor, the current can be further reduced, the magnetic ring is prevented from being saturated by traveling wave current passing through the magnetic ring, the magnetic ring is also prevented from being influenced by saturation effect, and the reliability of the magnetic ring for inhibiting VFTO is ensured.
The transition ring is used for realizing the conduction of the on-resistance cylinder and the branch conductor, and the structure is simple. The inner ring surface of the transition ring is in contact with the branch conductor, so that reliable electric contact can be guaranteed, the side surface of the transition ring can position the magnetic ring string, and vibration and noise of the magnetic ring string are reduced. When the magnetic ring is assembled, the transition ring is only required to clamp the magnetic ring string group and then is respectively conducted with the resistance cylinder and the conducting rod correspondingly, and the original structure is not required to be improved excessively.
Further, the resistor cylinder and the transition ring are fixedly connected through bolts arranged along the radial direction of the transition ring.
The beneficial effects are that: the fixed connection of the resistor cylinder and the transition ring is ensured by using the bolts arranged along the radial direction of the transition ring, the structure is simple, the connection is reliable, the bolts are arranged along the radial direction and can be used when a plurality of bolts are used, and the stability and the reliability are further improved.
Further, the bolt is made of a conductive material.
The beneficial effects are that: the bolt is made of conductive materials and plays a role in assisting in conducting electricity.
Further, the branch conductor and the transition ring are fixedly connected through bolts arranged along the radial direction of the transition ring.
The beneficial effects are that: the bolts arranged along the radial direction of the transition ring are used for ensuring the fixed connection of the branch conductor and the transition ring, the structure is simple, the connection is reliable, the bolts are arranged along the radial direction and can be used when a plurality of bolts are used, and the stability and the reliability are further improved.
Further, the bolt is made of a conductive material.
The beneficial effects are that: the bolt is made of conductive materials and plays a role in assisting in conducting electricity.
Further, the branch conductors are arranged in parallel between the two conductive rods.
The beneficial effects are that: arranging the branch conductors in parallel enables the current through the conductive rod to be distributed as evenly as possible over the branch conductors, and the parasitic inductance generated between the parallel arranged branch conductors is stronger.
Furthermore, the conducting rod comprises a transition disc which protrudes outwards along the radial direction of the conducting rod and is used for being connected with the branch conductors, and the branch conductors are uniformly distributed on the transition disc.
The beneficial effects are that: be provided with the transition dish on the conducting rod, branch conductor has bigger arrangement space when connecting on the transition dish, and the technical staff of being convenient for can increase the area of contact between conducting rod and the branch conductor with magnetic ring cluster suit on branch conductor to set up the transition dish, make branch conductor can undertake bigger electric current.
Further, the sum of the cross-sectional areas of the branch conductors is larger than the cross-sectional area of the conductive rod.
The beneficial effects are that: the sum of the cross-sectional areas of the branch conductors is larger than the cross-sectional area of the conducting rod, so that the branch conductors can bear the distributed current transmitted by the conducting rod.
Drawings
FIG. 1 is a schematic diagram of a relationship between a high frequency magnetic ring and a damping resistor in the prior art;
fig. 2 is a schematic structural view of a VFTO suppressing device in embodiment 1 of the present invention;
FIG. 3 is an enlarged view of a portion of the branched conductor of FIG. 2;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;
fig. 5 is a schematic structural view of a VFTO suppressing device in embodiment 2 of the present invention.
In the figure: 101. a conductive rod; 102. a magnetic ring string group; 103. a resistor cylinder; 201. a conductive rod; 202. a magnetic ring string group; 203. a resistor cylinder; 204. a tapping plate; 205. a branch conductor; 206. an external bolt; 207. a transition ring; 208. an insulating layer; 209. an inner bolt; 301. and (4) bolts.
Detailed Description
A specific embodiment of the present invention will now be described with reference to the accompanying drawings, which are shown in fig. 2, and which is an example 1 of a VFTO suppression device in the present invention: the VFTO suppressing device comprises two conducting rods 201 which are arranged at intervals along the axial direction of the VFTO suppressing device, and the conducting rods 201 are connected in a circuit to play a role of conducting the circuit. A plurality of branch conductors 205 arranged in parallel are arranged between the two conducting rods 201, the branch conductors 205 are respectively connected between the two conducting rods 201, and a parallel arrangement structure is formed between the conducting rods 201. The branch conductors 205 can shunt current passing through the conductive rod 201, a magnetic ring string 202 and a transition ring 207 which is arranged at two ends of the magnetic ring string 202 and is in stop fit with the magnetic ring at the end are sleeved on the outer peripheral surface of each branch conductor 205, the magnetic ring string 202 is clamped by the transition ring 207, and a resistance cylinder 203 is sleeved on the outer peripheral surfaces of the magnetic ring string 202 and the transition ring 207. An insulating layer 208 is disposed between the branch conductor 205 and the magnetic ring string 202. By shunting the branch conductors 205, the traveling wave current passing through the magnetic ring string 202 can be reduced, so that the influence of saturation on the magnetic ring string 202 is reduced, and the magnetic ring string 202 can effectively suppress VFTO.
As shown in fig. 2 and 3, a cylindrical surface of the transition ring 207 is fixedly connected to the inner wall of the resistor cylinder 203, and the transition ring is made of a conductive material, so that the transition ring 207 can form a conductive path with the resistor cylinder 203, an inner annular surface of the transition ring is fixed to the branch conductor 205 to fix the magnetic ring string set 202 on the branch conductor 205, the transition ring is electrically connected to the branch conductor 205 while the branch conductor 205 is fixed, the transition ring 207 is respectively conducted with the branch conductor and the resistor cylinder, the magnetic ring string set 202 and the resistor cylinder 203 form a parallel path through the transition ring, the length of the magnetic ring string set 202 after being matched with the transition ring 207 is equal to the length of the resistor cylinder 203, and the transition ring is located at openings at two ends of the resistor cylinder 203.
And a plurality of outer bolts 206 made of conductive materials are uniformly distributed between the resistor cylinder 203 and the transition ring 207. The resistance cylinder 203 comprises extending parts which are positioned at two ends of the resistance cylinder 203 and exceed the magnetic ring string group 202 in the length direction of the conducting rod 201, screw holes matched with the outer bolts 206 in a threaded mode are formed in the extending parts at two ends of the resistance cylinder 203, the outer bolts 206 penetrate through the resistance cylinder 203 from the outside of the resistance cylinder 203 and penetrate through the resistance cylinder 203 through being matched with the screw holes in a threaded mode, one end of each outer bolt 206 is close to the outer ring surface of the transition ring 207 in the moving process of the outer bolt 206, the transition ring 207 is provided with the screw holes matched with the outer bolts 206, the outer bolts 206 finally extend into the transition ring 207, and when the outer bolts 206 are guided in the VFTO restraining device to work, the contact end of each outer bolt 206 is always in electrical contact with the transition ring 207, so that the transition ring 207 is conducted with the resistance cylinder.
As shown in fig. 4, an inner bolt 209 is further disposed in the transition ring 207, and correspondingly, an inner bolt hole disposed in a staggered manner with respect to the bolt hole for the outer bolt 206 to penetrate through is disposed on the transition ring 207, and the transition ring 207 is fixed and conducted with the branch conductor 205 through the inner bolt 209. In order to prevent the inner bolt 209 from interfering with the installation of the resistor cylinder 203, the inner threaded hole also has a space to accommodate a nut of the inner bolt 209. The magnetic ring string 202 is formed in parallel relationship with the resistor drum 203 by a transition ring 207.
A tap disc 204 is arranged between the conducting rod 201 and the branch conductor 205, the conducting rod 201 is in transition with the branch conductor 205, the tap disc 204 protrudes out of the outer circumferential surface of the conducting rod 201 along the radial direction of the conducting rod 201, and the branch conductor 205 has a large installation space and a large contact area when being connected to the tap disc 204. The branch conductors 205 are connected to the conductive rod 201 by a tap 204, with a parallel relationship being established between the branch conductors 205. The sum of the cross-sectional areas of the branch conductors 205 is greater than the cross-sectional area of the conductive rod 201 to ensure that the branch conductors 205 can withstand the distributed current.
The resistance cylinder 203 is sleeved on the outer peripheral surface of the magnetic ring string group 202, the resistance cylinder 203 is conducted with the branch conductor 205 through the transition ring 207, namely, resistors are arranged at two ends of the magnetic ring string group 202 in parallel, the resistance cylinder 203 and the magnetic ring string group 202 form a parallel structure, considerable traveling wave current is distributed to the resistance cylinder 203 at the outermost end of the parallel structure by utilizing the extremely strong skin effect at high frequency, traveling wave energy is consumed by the resistance cylinder 203, and the inhibition effect of the traveling wave current on VFTO is reduced. When the VFTO passes through the branch conductor 205 in the conducting rod 201, the traveling wave current frequency is very high, the current distribution shows a very strong skin effect, the current density increases along the radial direction of the VFTO suppression device, the traveling wave current can get to the resistance cylinder 203 in the VFTO suppression device, the maximum current density is provided at the resistance cylinder 203, that is, the main traveling wave current is distributed on the resistance cylinder 203, and the traveling wave current in the magnetic ring string group 202 positioned at the inner side of the resistance cylinder 203 is greatly reduced, so that the influence of the traveling wave current on the saturation characteristic of the magnetic ring string group 202 is reduced.
However, when the resistance of the resistor cylinder 203 is large, the open circuit is approached, and the shunting effect is small; when the resistance of the resistor canister 203 is small and is close to short circuit, the effect of the magnetic ring string 202 is eliminated, and the suppression effect on VFTO is also eliminated, so that the resistance of the resistor canister 203 has an optimal value, which can be estimated according to the following formula:
Ro＝kR＝kρL/S＝kρNH/S
wherein k is a coefficient, R is an equivalent resistance of the magnetic ring string, ρ is a magnetic ring resistivity (unit Ω · m), L is an effective length of the magnetic ring string, S is a magnetic ring string cross-sectional area, N is a number of magnetic rings included in one magnetic ring string, and H is a thickness of a single magnetic ring. The recommended optimal value range of the coefficient k is as follows: 5 to 30.
By connecting the resistance cylinder 203 and the magnetic ring string group 202 in parallel, on one hand, the shunt effect can be realized, the traveling wave current is promoted to get through the resistance cylinder 203, the current density of the resistance cylinder 203 is improved, the saturation degree of the magnetic ring string group 202 is reduced, and the suppression effect of the magnetic ring string group 202 on VFTO is increased; on the other hand, the current passes through the resistor cylinder 203, the resistor cylinder 203 can absorb transient energy, the amplitude of the VFTO is reduced, the attenuation of the VFTO is increased, and the two aspects mutually promote to further improve the suppression effect of the VFTO.
When a technician assembles the VFTO suppression device of the present invention, the conductive rod 201, tap 204, and branch conductor 205 of the VFTO suppression device may be separate pieces that are then assembled together. The resistor 203 and the magnetic ring string 202 are additionally mounted on the branch conductor 205. Firstly, an insulating layer is arranged on the branch conductor 205, then a magnetic ring string group 202 is arranged outside the insulating layer, the number of magnetic ring monomers in the magnetic ring string group 202 is adjusted according to working conditions, transient simulation and engineering experience, the inner diameter size of the magnetic ring monomers in the magnetic ring string group 202 is the same as the outer diameter size of the branch conductor 205, the outer diameter size of the magnetic ring monomers is the same as the inner diameter size of the resistor cylinder 203, and the magnetic ring string group 202 and the resistor cylinder 203 are bonded together.
After the magnetic ring string 202 and the resistor cylinder 203 are fixed, the magnetic ring string 202 is clamped by using the transition ring 207 to realize the positioning on the branch conductor 205, the transition ring 207 is fixed on the branch conductor 205 by using the inner bolt 209, and the inner bolt 209 is completely screwed into the screw hole on the transition ring 207. The resistance cylinder 203 is sleeved on the outer peripheries of the transition ring 207 and the magnetic ring string 202, and the transition ring 207 and the resistance cylinder 203 are fixed by using the outer bolt 206. At this time, the resistor 203 is communicated with the branch conductor 205 through the transition ring 207, and a parallel structure with the magnetic ring string 202 is formed.
The transition ring 207 is made of an aluminum alloy material with good electric conductivity, such as 6063 aluminum alloy, and the inner bolt 209 and the outer bolt 206 are made of a hard aluminum alloy or a hard copper alloy with electric conductivity, such as 7a04 aluminum alloy, and serve as auxiliary electric conductivity.
As shown in fig. 5, a VFTO suppression device of embodiment 2 of the present invention is different from the VFTO suppression device of embodiment 1 in that the resistor cylinder 203, the transition ring 207, and the branch conductor 205 are directly inserted and fixed together by using an integral bolt 301.
With respect to the VFTO suppression device of embodiment 1, in other embodiments, due to certain structural constraints, the branch conductors can be connected between the two conductive rods in a radial connection, rather than in a parallel arrangement; each branch conductor can be directly connected to the corresponding end surface of the conducting rod without arranging a tapping board to be connected with the branch conductor; the sum of the cross-sectional areas of the branch conductors may be smaller than or equal to the cross-sectional area of the conductive rod.
The embodiment of the VFTO suppression apparatus in the second aspect of the present invention differs from the VFTO suppression apparatus in the first aspect described above in that the branch conductor is no longer provided on the conductive rod in the VFTO suppression apparatus, but the resistor cylinder is directly provided on the conductive rod. The conductive rod is provided with a magnetic ring series group and a transition ring, and the resistor cylinder is fixed on the transition ring through screws to realize parallel connection with the magnetic ring series group.
In other embodiments, the resistance cylinder can be pressed on the transition ring, the transition ring abuts against the conducting rod or the branch conductor by virtue of the force of the resistance cylinder in pressing, so that the resistance cylinder is conducted with the branch conductor or the conducting rod, the pressing mode is a structure for tightly hooping the resistance cylinder by using a hoop and the like, and the resistance cylinder is pressed on the transition ring close to the opening of the resistance cylinder by tightly hooping the resistance cylinder to make the opening of the resistance cylinder shrink; or the resistance cylinder is directly deformed, and the opening of the resistance cylinder is shrunk to press the resistance cylinder on a transition ring close to the opening of the resistance cylinder.
In other embodiments, the bolts for fixing the resistance cylinder and the transition ring, and the conductive rods and the transition ring may be made of an insulating material.
In other embodiments, the matching form of the transition ring and the resistor cylinder may also be replaced by other forms, for example, when the resistor cylinder is arranged between the transition rings, the annular end surface of the resistor cylinder is in contact with the annular end surface of the transition ring on the side close to the resistor cylinder, so as to realize conduction between the transition ring and the resistor cylinder.
The GIS device in the present invention includes the bus and the VFTO suppression device connected between the buses, and the VFTO suppression device may adopt the VFTO suppression device in the above embodiments, and therefore, details about the specific implementation of the GIS device are not described herein.
The above-mentioned embodiments, the objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (15)
1. A VFTO suppression device, characterized by: the magnetic ring type transformer comprises a conductive rod, wherein a magnetic ring string group is sleeved on the outer peripheral surface of the conductive rod, transition rings matched with corresponding magnetic ring stops to position the magnetic ring string group are arranged at two ends of the magnetic ring string group, resistance cylinders are sleeved on the outer side surfaces of the magnetic ring string group and the transition rings, the inner ring surface of each transition ring is fixed with the conductive rod and is in contact conduction, and the outer side surface of each transition ring is fixed with the resistance cylinder and is in contact conduction.
2. The VFTO suppression apparatus of claim 1, wherein: the resistance cylinder and the transition ring are fixedly connected through bolts arranged along the radial direction of the transition ring.
3. A VFTO suppression apparatus according to claim 2, wherein: the bolt is made of an electrically conductive material.
4. The VFTO suppression apparatus of claim 1, wherein: the conducting rod and the transition ring are fixedly connected through bolts arranged along the radial direction of the transition ring.
5. A VFTO suppression device according to claim 4, characterized by: the bolt is made of an electrically conductive material.
6. A VFTO suppression device, characterized by: the magnetic ring type transformer comprises conducting rods which are arranged at intervals along the axial direction of the magnetic ring type transformer, at least two branch conductors are arranged between the conducting rods in parallel, a magnetic ring string group is sleeved on the outer peripheral surface of each branch conductor, transition rings which are matched with corresponding magnetic rings in a blocking mode to position the magnetic ring string group are arranged at two ends of each magnetic ring string group, resistance cylinders are sleeved on the magnetic ring string group and the outer side surfaces of the transition rings in a sleeved mode, the inner ring surface of each transition ring is fixed with the corresponding branch conductors and is in contact conduction, and the outer side surfaces of the transition rings are fixed with the.
7. The VFTO suppression apparatus of claim 6, wherein: the resistance cylinder and the transition ring are fixedly connected through bolts arranged along the radial direction of the transition ring.
8. The VFTO suppression apparatus of claim 7, wherein: the bolt is made of an electrically conductive material.
9. The VFTO suppression apparatus of claim 6, wherein: the branch conductors are fixedly connected with the transition ring through bolts arranged along the radial direction of the transition ring.
10. The VFTO suppression apparatus of claim 9, wherein: the bolt is made of an electrically conductive material.
11. A VFTO suppression device according to any one of claims 6 to 10, characterized by: the branch conductors are arranged in parallel between the two conductive rods.
12. A VFTO suppression device according to any one of claims 6 to 10, characterized by: the conducting rod comprises a tapping disc which protrudes outwards along the radial direction of the conducting rod and is used for being connected with branch conductors, and the branch conductors are uniformly distributed on the tapping disc.
13. A VFTO suppression device according to any one of claims 6 to 10, characterized by: the sum of the cross-sectional areas of the branch conductors is larger than the cross-sectional area of the conductive rod.
A GIS device comprising bus bars and a VFTO suppression apparatus connected between the bus bars, characterized by: the VFTO suppressing device is the VFTO suppressing device described in any one of claims 1 to 5 above.
GIS equipment, including the generating line and connect VFTO suppression device between the generating line, its characterized in that: the VFTO suppressing device is the VFTO suppressing device described in any one of the above claims 6 to 13.
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| CN201910064543.2A CN109672162B (en) | 2019-01-23 | 2019-01-23 | GIS equipment and VFTO suppression device thereof |
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| CN201910064543.2A CN109672162B (en) | 2019-01-23 | 2019-01-23 | GIS equipment and VFTO suppression device thereof |
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| CN109672162A CN109672162A (en) | 2019-04-23 |
| CN109672162B true CN109672162B (en) | 2021-02-23 |
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| EP2747094A1 (en) * | 2012-12-21 | 2014-06-25 | ABB Technology AG | Very fast transient overvoltage attenuator |
| CN106972396A (en) * | 2017-03-20 | 2017-07-21 | 平高集团有限公司 | VFTO restraining devices, damping bus unit, bus and GIS |
| CN106992509A (en) * | 2017-05-18 | 2017-07-28 | 中国电力科学研究院 | A kind of laminated bus guide rod and suppressing method for being used to suppress VFTO |
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