CN103348425B - Meter transformer - Google Patents
Meter transformer Download PDFInfo
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- CN103348425B CN103348425B CN201180066745.2A CN201180066745A CN103348425B CN 103348425 B CN103348425 B CN 103348425B CN 201180066745 A CN201180066745 A CN 201180066745A CN 103348425 B CN103348425 B CN 103348425B
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- ground shield
- center conductor
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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
- H02B13/0356—Mounting of monitoring devices, e.g. current transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/16—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/24—Voltage transformers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The invention provides a kind of meter transformer, comprising: metal joint portion (3); Cylindric target (5a ~ 5c), this target (5a ~ 5c) is installed on the periphery in hole portion (20a ~ 20c) in metal joint portion (3) via the insulating component (10) of ring-type, and surrounds the periphery of center conductor (2a ~ 2c); Roughly cylindric ground shield (4a ~ 4c), this ground shield (4a ~ 4c) is configured to adjacent with target (5a ~ 5c) in the axial direction respectively; And insulated enclosure terminal, this insulated enclosure terminal is installed on the arm of the side being arranged on canister (1), and ensure hermetic to draw the lead-in wire be connected with target (5a ~ 5c) respectively, the internal diameter of target (5a ~ 5c) is larger than the internal diameter of ground shield (4a ~ 4c) respectively.
Description
Technical field
The present invention relates to the meter transformer be applied in three-phase integrated type gas-insulated switchgear device.
Background technology
In three-phase integrated type gas-insulated switchgear device, in the canister being sealed with insulating gas, be accommodated with three-phase conductor in the lump.The voltage of meter transformer to each phase conductor is measured.The employing that being applied to the meter transformer in three-phase integrated type gas-insulated switchgear device has utilizes the structure (Fig. 8 for example, referring to patent documentation 1) of the target in the form of a ring surrounded by each phase conductor coaxially.In such a configuration, be generally easier to from the target of phase the electric field influence being subject to his phase conductor, thus make due to the induced voltage of his phase evaluated error become large, thus general and be not suitable for the situation of requirement compared with high measurement accuracy.
Therefore, in the meter transformer described in Fig. 1 of patent documentation 1, position relative with each phase conductor respectively in the sidewall portion of canister is provided with the arm as target receiving room, and in each arm, is configured with the target of each phase.In such a configuration, the impact of his phase electric field can be reduced, thus improve the certainty of measurement of each phase voltage.
In addition, also disclose a kind of meter transformer in patent documentation 2, this meter transformer is provided with the tubular ground shield surrounding each phase conductor respectively, and is configured with the target of the tubular around conductor in the inner side of each ground shield.
Prior art document
Patent documentation
Patent documentation 1: Japanese utility model patents Beneficial 5-6376 publication
Patent documentation 2: Japanese Patent Laid-Open 2-115770 publication
Summary of the invention
Invent technical problem to be solved
But, such as, in the meter transformer of Fig. 8 of patent documentation 1, there is following problem: namely, owing to being subject to the electric field influence of his phase conductor from the target of phase, error caused by his phase induced voltage is increased, is difficult to thus correctly measure each phase voltage.
In addition, in the meter transformer of Fig. 1 of patent documentation 1, because the target of each phase is only relative with the conductor of respective corresponding phase, if compared with being therefore configured with the structure of target like that coaxially with Fig. 8 of such as patent documentation 1 around conductor, then the sensitivity of voltage detecting decreases, thus, may limit and requiring the use in more high-precision situation.In addition, in this structure, need at each arm all arranging target storage mutually, therefore meter transformer has in canister, arrange three arms.
In addition, in the meter transformer of patent documentation 2, due in the inner side of ground shield and by conductor side configuration target, therefore need the insulation distance guaranteed between target and conductor, thus the radial dimension that there is canister becomes large problem.
The present invention is in view of above-mentioned and complete, its object is to provide a kind of meter transformer be applied in three-phase integrated type gas-insulated switchgear device, this meter transformer can relax the impact of the electric field of his phase conductor, thus the voltage from phase can be detected accurately, and the radial dimension of canister can be made to diminish.
The technical scheme that technical solution problem adopts
In order to solve the problem, achieve the goal, meter transformer involved in the present invention is applicable to the three-phase integrated type gas-insulated switchgear device being accommodated with the center conductor of three-phase in the cylindrical metal container being sealed with insulating gas along the axis direction of this canister, and the voltage be applied to respectively on the center conductor of described three-phase is measured, it is characterized in that, comprise: metal joint portion, this metal joint portion is installed in described canister, and is formed with three holes portion through by the center conductor of described three-phase respectively; Cylindric target, this target is installed on the periphery in each hole portion in described metal joint portion via the insulating component of ring-type, and is configured to the periphery of the center conductor of each phase of surrounding through described each hole portion respectively; Roughly cylindric ground shield, this ground shield is configured to along described axis direction adjacent with the target of each phase respectively, and coaxial with this target, with the periphery making this ground shield surround the center conductor of this target through; And insulated enclosure terminal, this insulated enclosure terminal is installed on the arm of the side being arranged on described canister, and ensure hermetic to draw the lead-in wire be connected with the target of described each phase respectively, the internal diameter of the target of described each phase is larger than the internal diameter of described ground shield adjacent with this target on described axis direction.
Invention effect
According to the present invention, a kind of meter transformer be applied in three-phase integrated type gas-insulated switchgear device is provided, following effect can be played: by relaxing the impact of the electric field of his phase conductor, thus detect accurately from phase voltage, and the radial dimension of canister can be made to diminish.
Accompanying drawing explanation
Fig. 1 is the figure of the horizontal section structure of the meter transformer represented involved by execution mode 1.
Fig. 2 is the longitudinal profile structure chart of the A-A line along Fig. 1.
Fig. 3 is the detail view of the part B of Fig. 2.
Fig. 4 is a figure part of Fig. 3 amplified.
Fig. 5 represents the figure executing alive pattern.
Fig. 6 represents d size and the figure of relation being responded to caused error and electrostatic capacitance α by him mutually.
Fig. 7 is the figure of a part for the longitudinal profile structure of the meter transformer represented involved by execution mode 2.
Fig. 8 represents b size and the figure of relation being responded to caused error and electrostatic capacitance α by him mutually.
Fig. 9 is the figure of a part for the longitudinal profile structure of the meter transformer represented involved by execution mode 3.
Figure 10 is the length D of the axis direction represented for ground shield 4a, is responded to the figure of caused error by him mutually.
Figure 11 is another longitudinal profile structure chart along A-A line.
Figure 12 is the detail view of the part B of Figure 11.
Embodiment
Below, be described in detail based on the execution mode of accompanying drawing to meter transformer involved in the present invention.In addition, the present invention can't help these execution modes and limited.
Execution mode 1
The longitudinal profile structure chart of Fig. 1 to be the figure of the horizontal section structure of the meter transformer represented involved by present embodiment, Fig. 2 be A-A line along Fig. 1, Fig. 3 is the detail view of the part B of Fig. 2.
The structure of the meter transformer used in three-phase integrated type gas-insulated switchgear device has been shown in Fig. 1 ~ Fig. 3.Be sealed with such as SF
6in the tubular canister 1 of the insulating gass such as gas, be accommodated with the center conductor 2a ~ 2c of three-phase together.Canister 1 is such as cylindric, and ground connection.Extended respectively on the central axis direction of canister 1 have center conductor 2a ~ 2c.Because the central shaft of canister 1 and center conductor 2a ~ 2c central shaft are separately parallel to each other, therefore following the direction of these central shafts to be simply called " axis direction ".Center conductor 2a ~ 2c is the main circuit conductor as high-voltage charging portion.Center conductor 2a ~ 2c is such as configured in the summit of equilateral triangle.Center conductor 2a ~ 2c also such as can be configured in the summit of isosceles triangle.In addition, center conductor 2a ~ 2c supported by not shown insulating supporting body (such as insulating spacer).In addition, in Fig. 1, the section of center conductor 2a ~ 2c shows for solid, but such as also can be cylindrical.
The meter transformer of present embodiment comprises: metal joint portion 3, and this metal joint portion 3 such as roughly in discoideus, and has hole portion 20a ~ 20c through by center conductor 2a ~ 2c respectively; Target 5a, this target 5a are installed on the periphery of the hole portion 20a in metal joint portion 3 via insulating component 10, and are configured to center conductor 2a coaxial, with the periphery making this target 5a surround center conductor 2a; Ground shield 4a, this ground shield 4a is configured along axis direction in the mode adjacent with target 5a, and is configured to center conductor 2a coaxial, with the periphery making this ground shield 4a surround center conductor 2a; Holding wire 6a, this holding wire 6a are the lead-in wires be connected with target 5a; Target 5b, this target 5b are installed on the periphery of the hole portion 20b in metal joint portion 3 via insulating component 10, and are configured to center conductor 2b coaxial, with the periphery making this target 5b surround center conductor 2b; Ground shield 4b, this ground shield 4b is configured along axis direction in the mode adjacent with target 5b, and is configured to center conductor 2b coaxial, with the periphery making this ground shield 4b surround center conductor 2b; Holding wire 6b, this holding wire 6b are the lead-in wires be connected with target 5b; Target 5c, this target 5c are installed on the periphery of the hole portion 20c in metal joint portion 3 via insulating component 10, and are configured to center conductor 2c coaxial, with the periphery making this target 5c surround center conductor 2c; Ground shield 4c, this ground shield 4c is configured along axis direction in the mode adjacent with target 5c, and is configured to center conductor 2c coaxial, with the periphery making this ground shield 4c surround center conductor 2c; Holding wire 6c, this holding wire 6c are the lead-in wires be connected with target 5c; Insulation airtight terminal 7, this insulation airtight terminal 7 is installed on the arm 14 of the side being arranged on canister 1, and ensures the outside hermetic holding wire 6a ~ 6c being drawn out to canister 1; And AD conversion portion 8, this AD conversion portion 8 is connected with above-mentioned insulation airtight terminal 7, detect each magnitude of voltage of center conductor 2a ~ 2c according to each magnitude of voltage of the target 5a ~ 5c exported via holding wire 6a ~ 6c after, the magnitude of voltage these detected converts digital signal to and is exported.
In the meter transformer of present embodiment, target 5a ~ 5c induced voltage separately with canister 1 electric insulation is exported to outside, and go out center conductor 2a ~ 2c voltage separately according to these calculation of lightning induced voltages, thus form so-called capacitor voltage divider.Such as, the electrostatic capacitance between center conductor 2a and target 5a and the electrostatic capacitance between target 5a and canister 1 carry out dividing potential drop to the voltage of center conductor 2a, using the voltage as target 5a.Therefore, if try to achieve the electrostatic capacitance between center conductor 2a and target 5a in advance, then by detecting that the voltage of target 5a is to detect the voltage of center conductor 2a.In addition, in fact, in order to make the induced voltage on intermediate voltage 5a be suitable magnitude of voltage, such as, adjustment capacitor (not shown) etc. can be set between insulation airtight terminal 7 and canister 1.Center conductor 2b, 2c are also the same.
Metal joint portion 3 is such as rendered as less than the internal diameter of canister 1 a little discoideus of diameter, and is engaged with canister 1 by junction surface 9.Three holes portion 20a ~ 20c that metal joint portion 3 has the configuration according to center conductor 2a ~ 2c and formed, hole portion 20a ~ 20c has the diameter larger than the external diameter of center conductor 2a ~ 2c respectively.In addition, center conductor 2a ~ 2c is configured to any one and does not all contact with metal joint portion 3.Center conductor 2a ~ 2c via each hole portion 20a ~ 20c, generally perpendicularly through metal joint portion 3.
The periphery of the hole portion 20a in metal joint portion 3 is provided with insulating component 10 roughly in the form of a ring, such as target 5a is cylindrically installed in metal joint portion 3 in the mode of the periphery surrounding center conductor 2a via this insulating component 10.That is, target 5a is by insulating component 10 and canister 1 electric insulation.Target 5a and insulating component 10 such as utilize bolt etc. to be installed in metal joint portion 3.Same, the periphery of the hole portion 20b in metal joint portion 3 is provided with insulating component 10 roughly in the form of a ring, and such as target 5b is cylindrically installed in metal joint portion 3 in the mode of the periphery surrounding center conductor 2b via this insulating component 10.That is, target 5b is by insulating component 10 and canister 1 electric insulation.Target 5b and insulating component 10 such as utilize bolt etc. to be installed in metal joint portion 3.Same, the periphery of the hole portion 20c in metal joint portion 3 is provided with insulating component 10 roughly in the form of a ring, such as target 5c is cylindrically installed in metal joint portion 3 in the mode of the periphery surrounding center conductor 2c via this insulating component 10.That is, target 5c is by insulating component 10 and canister 1 electric insulation.Target 5c and insulating component 10 such as utilize bolt etc. to be installed in metal joint portion 3.In addition, identical label is marked to insulating component 10, but known from above-mentioned explanation and Fig. 1, Fig. 2, be provided with three insulating components accordingly with target 5a ~ 5c.
Ground shield 4a such as roughly cylindrically, is configured to center conductor 2a coaxial, with the periphery making it surround center conductor 2a.Ground shield 4a is configured to adjacent with target 5a in the axial direction.Ground shield 4a is being formed with flange part 41 by that one end of target 5a side, is then concentrate for relaxing electric field and be rendered as with the bend 42 of shape that extends outside of regulation curvature smoothing ground with the other end of target 5a opposite side.In illustrated example, be provided with a pair ground shield 4a, this is configured at the both sides of target 5a to ground shield 4a, and at axis direction clamping target 5a.Herein, it is relative across space part 13 with an end of target 5a that a ground shield in a pair ground shield 4a is configured to its flange part 41, another ground shield in a pair ground shield 4a is then configured to its flange part 41 and is positioned on the face relative with the face being configured with insulating component 10 in metal joint portion 3, and a pair ground shield 4a passes through such as bolt etc. and be installed in metal joint portion 3.Such as, an above-mentioned ground shield 4a is installed in metal joint portion 3 by the bolt 11 utilizing length also to grow than the axis direction length of target 5a.Space part 13 is gas gaps that an above-mentioned ground shield 4a and target 5a is insulated.Target 5a is insulated with canister 1 by insulating component 10 and space part 13.In three-phase integrated type gas-insulated switchgear device, the impact of the electric field of center conductor 2b, 2c of his phase can be subject to from the target 5a of phase, but ground shield 4a can relax the impact of the electric field produced by center conductor 2b, 2c of his phase.In addition, because ground shield 4b, 4c are also the same, therefore omit the description herein.
The internal diameter of target 5a is such as large than the internal diameter of ground shield 4a.Equally, the internal diameter of target 5b is also such as large than the internal diameter of ground shield 4b, and the internal diameter of target 5c is also such as large than the internal diameter of ground shield 4c.Fig. 4 is that the internal diameter of the figure after a part of Fig. 3 being amplified, target 5a is larger than the internal diameter of ground shield 4a, the internal diameter of the internal diameter-ground shield 4a of d=(target 5a)/2>0.
Herein, the effect setting larger than the internal diameter of ground shield 4a ~ 4c by the internal diameter of target 5a ~ 5c is respectively described.Fig. 5 represents the figure executing alive pattern, for illustration of the change that the electrostatic capacitance between target 5a and center conductor 2a produces because of the impact of the voltage of center conductor 2b, 2c.For applying voltage (1), be 100% at the voltage of center conductor 2a, and when the voltage of center conductor 2b, 2c is 0%, the electrostatic capacitance between target 5a and center conductor 2a is α (F).That is, α represents the electrostatic capacitance when the electric field influence not from center conductor 2b, 2c.On the other hand, for applying voltage (2), be 100% at the voltage of center conductor 2a, and when the voltage of center conductor 2b, 2c is-50%, the electrostatic capacitance between target 5a and center conductor 2a is β (F).That is, β represents the electrostatic capacitance when namely the electric field influence of center conductor 2b, 2c is maximum mutually from him.So based on the voltage of target 5a, the voltage measuring value of center conductor 2a responds to caused error mutually by him can as given a definition:
Error (%)=(alpha-beta)/α × 100 caused because he responds to mutually ... (1)
That is, in (1) formula, electrostatic capacitance β when utilizing the electric field influence from his phase to be maximum and by electrostatic capacitance α during electric field influence from his phase, evaluates and responds to caused error mutually by him.In addition, about the definition of (1) formula, target 5b, 5c are also identical.Such as, based on the voltage of target 5b, the voltage measuring value of center conductor 2b by he respond to mutually caused error be 100% by the voltage of center conductor 2b and the voltage of center conductor 2a, 2c is 0% time electrostatic capacitance α and the voltage of center conductor 2b be 100% and the voltage of center conductor 2a, 2c is-50% time electrostatic capacitance β, (1) formula of utilization defines.
Fig. 6 represents to respond to caused error and the electrostatic capacitance α internal diameter for the internal diameter-ground shield 4a of d=(target 5a mutually by him)/the figure of 2.Solid line represents responds to caused error mutually by him, and dotted line represents electrostatic capacitance α.As shown in Figure 6, the known increase along with d size, electrostatic capacitance α can reduce, but responds to caused error mutually by him and also reduce.Therefore, by setting d>0, can suppress to respond to caused error mutually by him, thus more correctly can measure the voltage of the center conductor 2a from phase.In addition, Fig. 6 also sets up naturally for target 5b, 5c.
As described above, according to the present embodiment, internal diameter due to target 5a ~ 5c all sets larger than the internal diameter of ground shield 4a ~ 4c, therefore the impact of the electric field produced by the center conductor of his phase can be suppressed, thus can with the voltage of higher precision measure from the center conductor of phase.
In addition, according to the present embodiment, because target 5a ~ 5c is all configured to the cylindrical shape around center conductor 2a ~ 2c, such as comparatively large with the target phase specific area of Fig. 1 of patent documentation 1, this improves the sensitivity of voltage detecting.In addition, in Fig. 1 of patent documentation 1, need the arm arranging three target storages in canister, and in the present embodiment, the number of arm 14 can be one, therefore the processing of canister 1 is simplified.
In addition, in the meter transformer of patent documentation 2, due in the inner side of ground shield and by conductor side configuration target, therefore need the insulation distance guaranteed between target and conductor, thus exist make the radial dimension of canister become large problem.In contrast, in present embodiment, the internal diameter due to target 5a ~ 5c all sets larger than the internal diameter of ground shield 4a ~ 4c, therefore compared with the meter transformer of patent documentation 2, can reduce the radial dimension of canister 1.
In addition, according to the present embodiment, because target 5a and ground shield 4a is configured to adjacent in the axial direction, target 5b and ground shield 4b is configured to adjacent in the axial direction, target 5c and ground shield 4c is configured to adjacent in the axial direction, therefore, compared with being configured with the structure of target like that in the inner side of ground shield with the meter transformer of patent documentation 2, can insulation distance being guaranteed, and the radial dimension of canister 1 can be made to diminish.
In addition, according to the present embodiment, owing to being provided with the space part 13 as gas gap between a ground shield in such as a pair ground shield 4a and target 5a, therefore without the need to arranging insulating component 10 in-between as another ground shield in a pair ground shield 4a and target 5a, thus the one-sided insulating component of target 5a can be omitted, make designs simplification.In addition, also can be following structure: space part 13 is not set, but between two ground shields and target 5a of a pair ground shield 4a, all insulating component is set.Figure 11 is another longitudinal profile structure chart along A-A line, and Figure 12 is the detail view of the part B of Figure 11.As shown in figs. 11 and 12, between target 5a and metal joint portion 3, be such as configured with the insulating component 10 of ring-type, and a ground shield in a pair ground shield 4a and be such as configured with the insulating component 12 of ring-type between target 5a.The structure of Figure 11 and Figure 12, except simplifying said structure, has the effect identical with present embodiment.In addition, target 5b, 5c is also the same.
In addition, according to the present embodiment, owing to being configured with the ground shield 4a that hold target 5a in the both sides of axis direction, therefore, it is possible to suppress the impact of the electric field produced by center conductor 2b, 2c of his phase, thus the voltage of the center conductor 2a from phase can be measured accurately.In addition, preferably ground shield 4a is configured at the structure of target 5a both sides, but also only can be configured at the arbitrary one-sided of target 5a.In addition, target 5b, 5c is also same.
When not arranging ground shield 4a, need to relax the electric field of metal joint portion 3 periphery.As in the embodiment described in, by arranging ground shield 4a, the electric field relaxing metal joint portion 3 periphery can be realized, and relax the impact of the electric field produced by center conductor 2b, 2c of his phase.In addition, target 5b, 5c is also same.
Execution mode 2
Fig. 7 is the figure of a part for the longitudinal profile structure of the meter transformer represented involved by execution mode 2, is to carry out with Fig. 4 the figure that contrasts.In present embodiment, based on the structure of execution mode 1, further the relation of the internal diameter of target 5a ~ 5c and the internal diameter of insulating component 10 is specified.Namely, as shown in Figure 7, the internal diameter of the insulating component 10 of the ring-type between metal joint portion 3 and target 5a less than the internal diameter of target 5a (with reference to P region), the internal diameter of the internal diameter-insulating component 10 of b=(target 5a)/2>0.In addition, same relation is also all set up for target 5b and the insulating component 10 contacted with this target 5b and target 5c and the insulating component 10 that contacts with this target 5c.In contrast, in execution mode 1, the internal diameter of insulating component 10 and the internal diameter of target 5a roughly equal.In addition, other structures of present embodiment are identical with execution mode 1.
Fig. 8 represents to respond to caused error and the electrostatic capacitance α internal diameter for the internal diameter-insulating component 10 of b=(target 5a mutually by him) figure of/2>0.Solid line represents responds to caused error mutually by him, and dotted line represents electrostatic capacitance α.As shown in Figure 8, the known increase along with b size, electrostatic capacitance α can reduce, but responds to caused error mutually by him and also reduce.Therefore, by setting b>0, can suppress to respond to caused error mutually by him, thus more correctly can measure the voltage of the center conductor 2a from phase.In addition, Fig. 8 also sets up naturally for target 5b, 5c.
According to the present embodiment, the internal diameter due to target 5a ~ 5c all sets larger than the internal diameter of insulating component 10, therefore can suppress the impact of the electric field produced by the center conductor of his phase, thus can measure the voltage of the center conductor from phase accurately.Other effects of present embodiment are identical with execution mode 1.
Execution mode 3
Fig. 9 is the figure of a part for the longitudinal profile structure of the meter transformer represented involved by present embodiment, is to carry out with Fig. 4 the figure that contrasts.In present embodiment, based on the structure of execution mode 1, further the relation of the axis direction length of such as target 5a and the axis direction length of ground shield 4a is specified.That is, as shown in Figure 9, the axis direction length of target 5a is being set to C, when the axis direction length of ground shield 4a is set to D, is meeting D >=C in the present embodiment.In addition, same relation is also all set up for target 5b and ground shield 4b and target 5c and ground shield 4c.
Figure 10 represents to respond to the figure of caused error for the axis direction length D of ground shield 4a mutually by him.Illustrated in Figure 10 for C be of a size of little, in, large three kinds of situations, D size and the relation responded to mutually by him between caused error.In addition, the desired value being responded to caused error by him is mutually represented with Q.If desired value Q be error below this value, then the certainty of measurement of voltage is in the value in required specification.As shown in Figure 10, the known increase along with D size, responds to caused error mutually by him and also can reduce.To C be of a size of little, in, three kinds of large situations compare, then more big error is less for C size.Therefore, if make the axis direction length of ground shield 4a longer, then can suppress to respond to caused error mutually by him, if contrast the axis direction length of ground shield 4a and the axis direction length of target 5a, then comparatively effective when such as setting D >=C.
In addition, Tu10Zhong, in the region represented by R, responds to caused error by him all roughly equal with desired value Q mutually, and with C be of a size of three kinds of large, medium and small situations have nothing to do.In addition, above-mentioned explanation is also set up naturally to the relation of ground shield 4b and target 5b and the relation of ground shield 4c and target 5c.
According to the present embodiment, length due to the axis direction by ground shield 4a is set to the length of the axis direction of target 5a with first-class, therefore can suppress the impact of the electric field produced by the center conductor of his phase, thus the voltage of the center conductor from phase can be measured accurately.
In addition, as Fig. 9 depicted, the radical length (radical length of flange part) of ground shield 4a is such as long than the radical length of target 5a.
Other effects of present embodiment and execution mode 1,2 identical.In addition, present embodiment also can be combined with execution mode 2.
Industrial practicality
As implied above, the present invention has actual effect as the meter transformer be applied in three-phase integrated type gas-insulated switchgear device.
Label declaration
1 canister
2a ~ 2c center conductor
3 metal joint portions
4a ~ 4c ground shield
5a ~ 5c target
6a ~ 6c holding wire
7 insulation airtight terminals
8AD converter section
9 junction surfaces
10,12 insulating components
11 bolts
13 space parts
14 arms
20a ~ 20c hole portion
41 flange parts
42 bends
Claims (5)
1. a meter transformer, be applicable to the three-phase integrated type gas-insulated switchgear device being accommodated with the center conductor of three-phase in the cylindrical metal container being sealed with insulating gas along the axis direction of this canister, and the voltage be applied to respectively on the center conductor of described three-phase is measured, it is characterized in that, comprising:
Metal joint portion, this metal joint portion is installed in described canister, and is formed with three holes portion through by the center conductor of described three-phase respectively;
Cylindric target, the target of this cylindrical shape is installed on via the insulating component of ring-type on the periphery in each hole portion in described metal joint portion, and is configured to the periphery of the center conductor of each phase of surrounding through described each hole portion respectively;
Ground shield roughly cylindrically, this ground shield roughly is cylindrically configured to along described axis direction adjacent with the target of each phase respectively, and coaxial with this target, with the periphery making this ground shield surround the center conductor of this target through;
And insulated enclosure terminal, this insulated enclosure terminal is installed on the arm of the side being arranged on described canister, and ensures hermetic to draw the lead-in wire be connected with the target of described each phase respectively,
The internal diameter of the target of described each phase is larger than the internal diameter of described ground shield adjacent with this target on described axis direction.
2. meter transformer as claimed in claim 1, is characterized in that,
Described ground shield clamps described target and is configured in the both sides of described axis direction.
3. meter transformer as claimed in claim 2, is characterized in that,
Be configured between the one-sided described ground shield of described target and described target and be provided with gas gap.
4. meter transformer as claimed in claim 1, is characterized in that,
The internal diameter of described target is larger than the internal diameter of described insulating component.
5. meter transformer as claimed in claim 1, is characterized in that,
The length of the described axis direction of described ground shield is more than the length of the described axis direction of the described target adjacent with this ground shield.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2011/061659 WO2012160625A1 (en) | 2011-05-20 | 2011-05-20 | Transformer for instruments |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103348425A CN103348425A (en) | 2013-10-09 |
| CN103348425B true CN103348425B (en) | 2016-03-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180066745.2A Active CN103348425B (en) | 2011-05-20 | 2011-05-20 | Meter transformer |
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| Country | Link |
|---|---|
| JP (1) | JP4896280B1 (en) |
| CN (1) | CN103348425B (en) |
| WO (1) | WO2012160625A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5615463B1 (en) * | 2013-11-15 | 2014-10-29 | 三菱電機株式会社 | Voltage detection apparatus and voltage detection method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1077567A (en) * | 1992-03-17 | 1993-10-20 | 株式会社日立制作所 | The instrument current transformer that is used for power cable |
| CN1373484A (en) * | 2001-03-06 | 2002-10-09 | 三菱电机株式会社 | Threephase common-box current transformer |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02115770A (en) * | 1988-10-26 | 1990-04-27 | Toshiba Corp | Voltage detector for three-phase collective type gas insulated electric apparatus |
| JP2867505B2 (en) * | 1989-12-04 | 1999-03-08 | 三菱電機株式会社 | Instrument transformer |
| JPH05142264A (en) * | 1991-11-22 | 1993-06-08 | Mitsubishi Electric Corp | Voltage divider |
| JPH09261813A (en) * | 1996-03-26 | 1997-10-03 | Nissin Electric Co Ltd | Gas insulated switchgear |
| JP2001027653A (en) * | 1999-07-14 | 2001-01-30 | Mitsubishi Electric Corp | Capacitor potential divider |
| US6850399B1 (en) * | 2000-03-01 | 2005-02-01 | Hitachi, Ltd. | Gas insulated device and failure rating method |
| JP2003109447A (en) * | 2001-09-28 | 2003-04-11 | Toshiba Corp | Polymer insulating tube and transformation device using the same |
-
2011
- 2011-05-20 JP JP2011544312A patent/JP4896280B1/en active Active
- 2011-05-20 WO PCT/JP2011/061659 patent/WO2012160625A1/en active Application Filing
- 2011-05-20 CN CN201180066745.2A patent/CN103348425B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1077567A (en) * | 1992-03-17 | 1993-10-20 | 株式会社日立制作所 | The instrument current transformer that is used for power cable |
| CN1373484A (en) * | 2001-03-06 | 2002-10-09 | 三菱电机株式会社 | Threephase common-box current transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2012160625A1 (en) | 2014-07-31 |
| WO2012160625A1 (en) | 2012-11-29 |
| JP4896280B1 (en) | 2012-03-14 |
| CN103348425A (en) | 2013-10-09 |
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