CN109888740B - VFTO restraining device and GIS equipment - Google Patents
VFTO restraining device and GIS equipment Download PDFInfo
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- CN109888740B CN109888740B CN201910082882.3A CN201910082882A CN109888740B CN 109888740 B CN109888740 B CN 109888740B CN 201910082882 A CN201910082882 A CN 201910082882A CN 109888740 B CN109888740 B CN 109888740B
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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 restraining device comprises a conductive rod, a magnetic ring string group is sleeved on the outer peripheral surface of the conductive rod, a resistor cylinder is sleeved on the outer peripheral surface of the magnetic ring string group, extending parts which exceed the magnetic ring string group in the length direction of the conductive rod are arranged at two ends of the resistor cylinder respectively, an annular space is formed between the extending parts and the conductive rod, a jackscrew which fixes the resistor cylinder on the conductive rod penetrates through the extending parts, the jackscrew penetrates through the annular space to be in contact with the conductive rod so as to achieve conduction between the resistor cylinder and the conductive rod, and the jackscrew is made of a conductive material. 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 a VFTO restraining device and GIS equipment.
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, which can suppress VFTO and improve safety.
In order to achieve the above object, the VFTO suppressing device of the present invention employs a first technical solution as follows:
the VFTO suppression device comprises a conductive rod, wherein a magnetic ring string group is sleeved on the outer peripheral surface of the conductive rod, a resistor cylinder is sleeved on the outer peripheral surface of the magnetic ring string group, extending parts which exceed the magnetic ring string group in the length direction of the conductive rod are respectively arranged at two ends of the resistor cylinder, an annular space is formed between the extending parts and the conductive rod, a jackscrew which fixes the resistor cylinder on the conductive rod penetrates through the extending parts, the jackscrew penetrates through the annular space to be in contact with the conductive rod so as to achieve conduction between the resistor cylinder and the conductive rod, and the jackscrew is made of a conductive material.
The beneficial effects are that: the resistance cylinder and the conducting rod are connected or disconnected by using the jackscrew made of the conducting material, the jackscrew is simple in structure and convenient to use, the jackscrew is only required to be screwed in or out to enable the jackscrew to be correspondingly contacted with or separated from the peripheral surface of the conducting rod, the resistance cylinder and the conducting rod are connected or disconnected, the resistance cylinder and the conducting rod form a parallel connection relationship, complex processing and transformation are not required to be carried out on the conducting rod, and the assembly relationship is simple; on the other hand, the cooperation requirement of jackscrew and conducting rod is comparatively wide, and when the area of contact of jackscrew and conducting rod is less, form contact resistance between jackscrew and the conducting rod, can make jackscrew-conducting rod form the resistance grow of route, further reduce the travelling wave electric current through magnetic ring cluster, improve the effect that magnetic ring cluster restraines VFTO to the requirement of jackscrew and conducting rod's cooperation is not so strict, and technical staff need not often check the cooperation relation of jackscrew and conducting rod, and the assembly is simple. In addition, an extension part is arranged on the resistance cylinder, an annular space is formed between the extension part and the conductive rod, the jackscrew is matched with the extension parts at the two ends of the resistance cylinder to realize the parallel connection of the resistance cylinder, the conductive rod and the magnetic ring series group, so that the jackscrew has an installation space which is in contact with the conductive rod, and the number of the jackscrews can be increased to improve the conduction rate and the stability.
Furthermore, more than two jackscrews are uniformly distributed on the extension part around the axis of the conducting rod.
The beneficial effects are that: the stability can be improved by increasing the number of the jackscrews.
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 a VFTO restraining device connected between the buses, wherein the VFTO restraining device comprises a conducting rod, a magnetic ring string group is sleeved on the outer peripheral surface of the conducting rod, a resistor cylinder is sleeved on the outer peripheral surface of the magnetic ring string group, extending parts which exceed the magnetic ring string group in the length direction of the conducting rod are arranged at two ends of the resistor cylinder respectively, an annular space is formed between the extending parts and the conducting rod, a top wire for fixing the resistor cylinder on the conducting rod penetrates through the extending parts, the top wire penetrates through the annular space and is in contact with the conducting rod to achieve conduction of the resistor cylinder and the conducting rod, and the top wire is made of conducting materials.
The beneficial effects are that: the resistance cylinder and the conducting rod are connected or disconnected by using the jackscrew made of the conducting material, the jackscrew is simple in structure and convenient to use, the jackscrew is only required to be screwed in or out to enable the jackscrew to be correspondingly contacted with or separated from the peripheral surface of the conducting rod, the resistance cylinder and the conducting rod are connected or disconnected, the resistance cylinder and the conducting rod form a parallel connection relationship, complex processing and transformation are not required to be carried out on the conducting rod, and the assembly relationship is simple; on the other hand, the cooperation requirement of jackscrew and conducting rod is comparatively wide, and when the area of contact of jackscrew and conducting rod is less, form contact resistance between jackscrew and the conducting rod, can make jackscrew-conducting rod form the resistance grow of route, further reduce the travelling wave electric current through magnetic ring cluster, improve the effect that magnetic ring cluster restraines VFTO to the requirement of jackscrew and conducting rod's cooperation is not so strict, and technical staff need not often check the cooperation relation of jackscrew and conducting rod, and the assembly is simple. In addition, an extension part is arranged on the resistor cylinder, an annular space is formed between the extension part and the conductive rod, the jackscrew is matched with the extension parts at the two ends of the resistor cylinder to realize the parallel connection of the resistor cylinder, the conductive rod and the magnetic ring series group, so that the jackscrew has an installation space which is in contact with the conductive rod, the number of the jackscrews can be increased to improve the conduction rate and stability, and further the electricity utilization safety of GIS equipment is improved.
Furthermore, more than two jackscrews are uniformly distributed on the extension part around the axis of the conducting rod.
The beneficial effects are that: the stability can be improved by increasing the number of the jackscrews.
In order to achieve the above object, the VFTO suppressing device of the present invention employs the following second technical means:
the VFTO restraining device comprises conducting rods which are arranged at intervals along the axial direction of the VFTO restraining device, at least more than 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, a resistor cylinder is sleeved on the outer peripheral surface of each magnetic ring string group, extending parts which exceed the magnetic ring string groups in the length direction of the conducting rods are arranged at two ends of each resistor cylinder respectively, an annular space is formed between each extending part and the conducting rods, jackscrews which fix the resistor cylinders on the conducting rods penetrate through the extending parts, the jackscrews penetrate through the annular spaces and are in contact with the conducting rods to achieve conduction of the resistor cylinders and the conducting rods, and the jackscrews are made of conducting materials.
The beneficial effects are that: firstly, more than two branch conductors are arranged between the conducting rods, so that the current passing through the conducting rods can simultaneously get the branch conductors, the traveling wave current passing through the branch conductors is reduced, the branch conductors are sleeved with a magnetic ring series group, the traveling wave current is small, and the magnetic ring cannot be saturated, so that 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.
Secondly, the resistance cylinder and the branch conductor are connected by using the jackscrew made of a conductive material, on one hand, the jackscrew is simple in structure and convenient to use, and the resistance cylinder and the branch conductor can be connected or disconnected only by screwing in or screwing out the jackscrew to enable the jackscrew to correspondingly contact or separate from the contact with the outer peripheral surface of the branch conductor, the resistance cylinder and the branch conductor form a parallel connection relation, complex processing and transformation are not needed to be carried out on the branch conductor, and the assembly relation is simple; on the other hand, the cooperation requirement of jackscrew and branch conductor is comparatively wide, and when the area of contact of jackscrew and branch conductor is less, form contact resistance between jackscrew and the branch conductor, can make jackscrew-branch conductor form the resistance grow of route, further reduces the travelling wave electric current through magnetic ring cluster, improves the effect that the magnetic ring cluster restraines VFTO to the cooperation requirement of jackscrew and branch conductor is not so strict, and technical staff need not often check the cooperation relation of jackscrew and conducting rod, and the assembly is simple. In addition, an extension part is arranged on the resistor cylinder, an annular space is formed between the extension part and the branch conductor, the jackscrew is matched with the extension parts at the two ends of the resistor cylinder to realize the parallel connection of the resistor cylinder, the branch conductor and the magnetic ring series, so that the jackscrew has an installation space which is in contact with the branch conductor, and the number of the jackscrews can be increased to improve the conduction rate and stability.
Furthermore, more than two jackscrews are uniformly distributed on the extension part around the axis of the conducting rod.
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:
GIS equipment, including the generating line and connecting the VFTO suppression device between the generating line, VFTO suppression device includes the conducting rod along self axial interval arrangement, and parallel arrangement has two at least branch conductors more than between the conducting rod, and the cover is equipped with magnetic ring cluster group on the outer peripheral face of each branch conductor, and the cover is equipped with a resistance cylinder on the outer peripheral face of magnetic ring cluster group, the both ends of resistance cylinder are provided with the extension that surpasss magnetic ring cluster group on the conducting rod length direction respectively, form the annular space between extension and the conducting rod, wear to be equipped with the jackscrew of fixing the resistance cylinder on the conducting rod on the extension, the jackscrew has to pass the annular space and the conducting rod contact in order to realize that resistance cylinder switches on with the conducting rod, the jackscrew is made by conducting material.
The beneficial effects are that: firstly, more than two branch conductors are arranged between the conducting rods, so that the current passing through the conducting rods can simultaneously get the branch conductors, the traveling wave current passing through the branch conductors is reduced, the branch conductors are sleeved with a magnetic ring series group, the traveling wave current is small, and the magnetic ring cannot be saturated, so that the magnetic ring can stably inhibit VFTO; when the plurality of branch conductors arranged in parallel are electrified, the current directions are the same, parasitic inductance can be generated in each branch conductor, the current can be further reduced, the traveling wave current passing through the magnetic ring can not saturate the magnetic ring, the magnetic ring can be prevented from being influenced by saturation effect, the reliability of the magnetic ring for inhibiting VFTO is ensured, and the electricity utilization safety of GIS equipment is further improved.
Secondly, the resistance cylinder and the branch conductor are connected by using the jackscrew made of a conductive material, on one hand, the jackscrew is simple in structure and convenient to use, and the resistance cylinder and the branch conductor can be connected or disconnected only by screwing in or screwing out the jackscrew to enable the jackscrew to correspondingly contact or separate from the contact with the outer peripheral surface of the branch conductor, the resistance cylinder and the branch conductor form a parallel connection relation, complex processing and transformation are not needed to be carried out on the branch conductor, and the assembly relation is simple; on the other hand, the cooperation requirement of jackscrew and branch conductor is comparatively wide, and when the area of contact of jackscrew and branch conductor is less, form contact resistance between jackscrew and the branch conductor, can make jackscrew-branch conductor form the resistance grow of route, further reduces the travelling wave electric current through magnetic ring cluster, improves the effect that the magnetic ring cluster restraines VFTO to the cooperation requirement of jackscrew and branch conductor is not so strict, and technical staff need not often check the cooperation relation of jackscrew and conducting rod, and the assembly is simple. In addition, an extension part is arranged on the resistor cylinder, an annular space is formed between the extension part and the branch conductor, the jackscrew is matched with the extension parts at the two ends of the resistor cylinder to realize the parallel connection of the resistor cylinder, the branch conductor and the magnetic ring series, so that the jackscrew has an installation space which is in contact with the branch conductor, and the number of the jackscrews can be increased to improve the conduction rate and stability.
Furthermore, more than two jackscrews are uniformly distributed on the extension part around the axis of the conducting rod.
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 a schematic structural view of a VFTO suppression 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 transition disk; 205. a branch conductor; 206. carrying out top thread; 301. a conductive rod; 302. a magnetic ring string group; 303. a resistor cylinder; 306. and (5) jacking the screw.
Detailed Description
A specific embodiment of the VFTO suppression device and the GIS equipment according to the present invention will now be described with reference to the accompanying drawings, as shown in fig. 2, which is an embodiment 1 of the VFTO suppression device according to 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 is sleeved on the outer peripheral surface of each branch conductor 205, and a resistor cylinder 203 is sleeved on the outer peripheral surface of the magnetic ring string 202. An insulating layer is arranged 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. And a plurality of jackscrews 206 made of conductive materials are uniformly distributed between the resistor cylinder 203 and the branch conductors 205. The resistor cylinder 203 comprises extension parts which are positioned at two ends of the resistor cylinder 203 and exceed the magnetic ring string group 202 in the length direction of the conducting rod 201, an annular space surrounding the axis of the conductive rod 201 is formed between the extension part of the resistance cylinder 203 and the conductive rod 201, screw holes matched with the jackscrews 206 in a threaded manner are formed on the extension parts at two ends of the resistance cylinder 203, the jackscrews 206 penetrate through the resistance cylinder 203 from the outside, and passes through the resistance cylinder 203 by being in threaded fit with the screw hole, one end of the jackscrew 206 is close to the outer peripheral surface of the conductive rod 201 during the movement of the jackscrew 206, and finally abuts against the outer peripheral surface of the conductive rod 201, the end of the top thread 206 contacting the conductive rod 201 is the contact end of the top thread 206, when the VFTO restraining device works, the contact end of the jackscrew 206 is always in contact with the outer peripheral surface of the conducting rod 201, so that the conducting rod 201 and the resistor cylinder 203 are conducted through the jackscrew 206, the parallel connection of the resistor cylinder 203 and the magnetic ring string 202 can be realized through jackscrews at two ends of the resistor cylinder.
A transition disc 204 which is used for switching the conducting rod 201 and the branch conductor 205 is arranged between the conducting rod 201 and the branch conductor 205, the transition 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 larger installation space and a larger contact area when being connected on the transition disc 204. The branch conductors 205 are connected to the conductive rod 201 by a transition plate 204, and a parallel relationship is formed 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 jackscrew 206, 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.
The resistance cylinder 203 is fixed on the outer peripheral surfaces of the branch conductors 205 and the magnetic ring string 202 through the jackscrew 206, only the resistance cylinder 203 needs to be processed, the jackscrew 206 is in threaded fit with a screw hole of the resistance cylinder 203, a stable connection relation can be formed, and when a contact end of the jackscrew 206 is in contact with the outer peripheral surface of the branch conductor 205, a high-strength connection relation is not needed, only the requirement of contact conduction of the jackscrew 206 and the branch conductors 205 is met, contact resistance can be formed when the contact area of the jackscrew 206 and the branch conductors 205 is small, the resistance value between the jackscrew 206 and the branch conductors 205 is increased, and traveling wave current is further reduced. Moreover, because the requirement for contact between the jackscrew 206 and the branch conductor 205 is loose, technicians do not need to screw the jackscrew 206 tightly, and do not need to check the matching relationship between the jackscrew 206 and the branch conductor 205 frequently, the applicability is strong.
When a technician assembles the VFTO suppression device of the present invention, the conductive rod 201, transition plate 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 jackscrew 206 penetrates into the resistor cylinder 203, the resistor cylinder 203 can be conducted with the branch conductor 205, the jackscrew 206 presses the end position of the resistor cylinder 203 to the axis of the resistor cylinder 203, so that openings at two ends of the resistor cylinder are contracted inwards, the magnetic ring string group 202 is squeezed to the middle part of the resistor cylinder 203 from the end part of the resistor cylinder 203, the function that the jackscrew 206 limits the displacement of the magnetic ring string group 202 in the resistor cylinder 203 is realized, and a passage for communicating the resistor cylinder 203 with the branch conductor 205 is formed by the contact end of the jackscrew 206 and the end, which is in contact with the resistor cylinder 203, of the jackscrew 206.
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 transition disc 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.
As shown in fig. 3, embodiment 2 of the VFTO suppression apparatus of the present invention: the difference from the VFTO suppression device in embodiment 1 is that the branch conductor is not provided on the conductive rod 301 in the VFTO suppression device, but the resistor drum 303 is provided directly on the conductive rod 301. The conductive rod 301 is provided with a magnetic ring string group 302, and the resistance cylinder 303 is fixed on the conductive rod 301 through a jackscrew 306.
In other embodiments, only one jackscrew on the resistor cylinder may be provided.
The VFTO suppression devices in embodiments 1 and 2 may be connected to a circuit that needs to suppress saturation of the magnetic ring, for example, to a connection line of GIS or GIL, or may be sold as a separate product. For the power frequency current in normal operation, the frequency is lower, and the magnetic ring is only sensitive to high-frequency signals, so the power frequency current mainly passes through the internal conducting rod and hardly flows through the magnetic ring string group, and the parallel structure of the resistance cylinder and the magnetic ring string group does not influence the normal operation of the GIS or the GIL.
In other embodiments, the position of the jackscrew may be close to the magnetic ring string set, so that the rod part of the jackscrew located in the resistor cylinder abuts against the side surface of the magnetic ring string set, and the jackscrew is used to limit the displacement of the magnetic ring string set.
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 (9)
1. A VFTO suppression device, characterized by: the conductive rod comprises a conductive rod, a magnetic ring string group is sleeved on the outer peripheral surface of the conductive rod, a resistor cylinder is sleeved on the outer peripheral surface of the magnetic ring string group, extending parts which exceed the magnetic ring string group in the length direction of the conductive rod are arranged at two ends of the resistor cylinder respectively, an annular space is formed between the extending parts and the conductive rod, a jackscrew which fixes the resistor cylinder on the conductive rod penetrates through the annular space to be in contact with the conductive rod so as to achieve conduction between the resistor cylinder and the conductive rod, the jackscrew is made of a conductive material, and the jackscrew can limit the axial displacement of the magnetic ring string group after penetrating into the resistor cylinder.
2. The VFTO suppression apparatus of claim 1, wherein: more than two jackscrews are uniformly distributed on the extending part around the axis of the conducting rod.
3. A VFTO suppression device, characterized by: the magnetic ring type current transformer comprises conducting rods which are arranged at intervals along the axial direction of the magnetic ring type current 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, a resistor cylinder is sleeved on the outer peripheral surface of each magnetic ring string group, extending parts which exceed the magnetic ring string group in the length direction of the conducting rods are arranged at two ends of each resistor cylinder respectively, an annular space is formed between each extending part and the corresponding conducting rod, jackscrews which fix the resistor cylinders on the conducting rods penetrate through the extending parts, the jackscrews penetrate through the annular space and are in contact with the conducting rods to achieve conduction of the resistor cylinders and the conducting rods, the jackscrews are made of conducting materials, and the jackscrews can limit the magnetic ring string groups to generate.
4. A VFTO suppression apparatus according to claim 3, wherein: more than two jackscrews are uniformly distributed on the extending part around the axis of the conducting rod.
5. A VFTO suppression apparatus according to claim 3, wherein: the branch conductors are arranged in parallel between the two conductive rods.
6. A VFTO suppression device according to any one of claims 3 to 5, characterized by: 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 branch conductors, and the branch conductors are uniformly distributed on the transition disc.
7. A VFTO suppression device according to any one of claims 3 to 5, characterized by: the sum of the cross-sectional areas of the branch conductors is larger than the cross-sectional area of the conductive rod.
GIS equipment, including the generating line and connecting the VFTO suppression device between the generating line, its characterized in that: the VFTO suppressing device is the VFTO suppressing device described in claim 1 or 2 above.
GIS equipment, including the generating line and connecting the 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 3 to 7.
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| JP4749482B2 (en) * | 2009-07-08 | 2011-08-17 | Ｔｄｋ株式会社 | Composite electronic components |
| CN104134502B (en) * | 2013-05-24 | 2017-04-19 | 国家电网公司 | Gapless metal oxide arrester |
| CN106486991B (en) * | 2015-08-27 | 2019-03-08 | 中国电力科学研究院 | It is a kind of for inhibiting the damping bus of VFTO |
| CN205723039U (en) * | 2016-04-18 | 2016-11-23 | 上海久能机电制造有限公司 | A kind of novel cylinder helical inductor resistance unit |
| CN205828851U (en) * | 2016-04-25 | 2016-12-21 | 南通汇丰电子科技有限公司 | A kind of conducting ring device and conducting ring group |
| CN206274491U (en) * | 2016-11-18 | 2017-06-23 | 国家电网公司 | A kind of capacitance-resistance module and the divider including the capacitance-resistance module |
| CN106992509B (en) * | 2017-05-18 | 2019-04-30 | 中国电力科学研究院 | It is a kind of for inhibiting the laminated bus guide rod and suppressing method of VFTO |
| CN108923342B (en) * | 2018-05-28 | 2021-11-02 | 中国电力科学研究院有限公司 | GIS outlet sleeve with damping function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN205264589U (en) * | 2015-12-08 | 2016-05-25 | 新东北电气集团超高压有限公司 | Restrain device that isolator operation produced VFTO |
| CN106505457A (en) * | 2016-11-21 | 2017-03-15 | 云南电网有限责任公司电力科学研究院 | A kind of nanocrystalline magnetic loop device |
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