CN110196350A - Bottom shielding of bushing earthing or grounding means, leakage current collection system and method - Google Patents
Bottom shielding of bushing earthing or grounding means, leakage current collection system and method Download PDFInfo
- Publication number
- CN110196350A CN110196350A CN201910411826.XA CN201910411826A CN110196350A CN 110196350 A CN110196350 A CN 110196350A CN 201910411826 A CN201910411826 A CN 201910411826A CN 110196350 A CN110196350 A CN 110196350A
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- China
- Prior art keywords
- attachment base
- grounding means
- earthing
- end shield
- bushing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- General Physics & Mathematics (AREA)
- Cable Accessories (AREA)
Abstract
The present invention discloses a kind of bottom shielding of bushing earthing or grounding means, leakage current collection system and method, including the attachment base being mounted on casing, is cavity in the attachment base, is mounted under the end shield of casing；Wiring cone is provided in the cavity of the attachment base, one end of wiring cone is fixed on attachment base, and the other end is connected with end shield stem；Current transformer is installed on the wiring cone, the current transformer realizes that power supply and data are transmitted by connecting with the external aviation plug being mounted at the top of attachment base, of the invention is reasonable in design, when the bottom shielding of bushing that put into operation is transformed, original end shield grounding shell need to only be replaced with to the bottom shielding of bushing earthing or grounding means in the present invention, tighten screw, end shield stem is bored with wiring and is reliably connected through angle spring, to ensure that the reliable ground of bottom shielding of bushing for end shield and casing metal cage connection.
Description
Technical field
The present invention relates to belong to bushing shell for transformer monitoring field, and in particular to a kind of bottom shielding of bushing earthing or grounding means, leakage electricity
Flow acquisition system and method.
Background technique
Capacitive bushing is the indispensable external connection group of power transformer as typical paper oil insulation equipment
Part.Data shows that 110kV and the above bushing shell for transformer accident occupy certain ratio in electric power accident sum, and with electricity
Pressure grade increases, and casing causes the ratio of electric power accident to rise.As can a kind of simple and effective on-line monitoring method is taken,
Defect is found and alerted in time before casing failure, and is adopted an effective measure, will be avoided that the generation of major accident, is generated huge
Economic and social benefit.
Leakage Current is the weak current for flowing through casing paper oil insulation structure, finally flowing into the earth through bottom shielding of bushing, not only
It can directly reflect casing insulation status roughly, it can also be by equivalent capacitance value and dielectric loss angle that casing is calculated just
It cuts, to accurately react casing insulation status.Therefore it is of great significance to the monitoring of casing Leakage Current.
In actual moving process, bottom shielding of bushing needs reliable ground, otherwise divides through stray capacitance, exists at bottom shielding of bushing high
Pressure, jeopardizes site operation personnel's personal safety.
Leakage Current is acquired and needs to be transformed bottom shielding of bushing, existing modification scheme has the following problems:
Improved end shield grounding shell is complicated for operation when dismantling, and is not easy to the extraction of bottom shielding of bushing stem, is field test personnel
Work make troubles, while grounding shell removes and installs a possibility that also greatly increasing end shield unreliable ground connection；
Collected current signal is interfered vulnerable to the electromagnetic environment of substation field complexity.
Summary of the invention
To solve the above-mentioned problems, the object of the present invention is to provide a kind of bottom shielding of bushing earthing or grounding means, leakage current collection
System and method realizes high-precision anti-interference Leakage Current while reliable ground always under guaranteeing the various operating conditions of bottom shielding of bushing
Acquisition, modular bottom shielding of bushing earthing or grounding means of the invention make the end shield retrofit work simple possible to existing casing, and
It is easy to install and remove, guarantees bottom shielding of bushing reliable ground always, realize the acquisition of the anti-interference Leakage Current of high-precision.
In order to realize upper above-mentioned purpose, the present invention adopts the following technical scheme: bottom shielding of bushing earthing or grounding means, including be mounted on
Attachment base on casing, the interior attachment base is cavity, is mounted under the end shield of casing；It is provided in the cavity of the attachment base
One end of wiring cone, wiring cone is fixed on attachment base, and the other end is connected with end shield stem；Electricity is installed on the wiring cone
Current transformer, the current transformer realize power supply sum number by connecting with the external aviation plug being mounted at the top of attachment base
According to transmission.
The wiring cone one end that is connected with end shield stem is provided with sleeve, is set on end shield stem by sleeve,
And it is connected between sleeve lining and end shield stem by canted coil spring.
The current transformer is set in wiring cone middle section, and current transformer is fixed on wiring cone by positioning sleeve, with
End shield earthing or grounding means collection is combined into an entirety, and the positioning sleeve is set on wiring cone, be located at attachment base and current transformer it
Between.
The attachment base includes the gland that open-topped shell and lid are located at case top opening, and the gland passes through
Hexagon socket cap head screw is fixed on attachment base, and is provided with rubber washer on the contact surface of gland and attachment base and is realized to even
Closing at the top of joint chair.
It is connected through a screw thread between the wiring cone and attachment base, and the end of thread of wiring cone is connected on gland.
The present invention also provides a kind of leakage current collection systems, comprising: bottom shielding of bushing earthing or grounding means, data type conversion
Module, signal transmission module, in which:
Initial current signal acquisition is analog signal by the current transformer integrated in described sleeve pipe end shield earthing or grounding means, and
It is sent to data type conversion module；
The data type conversion module is used to receive the analog signal of current transformer, and the analog signal is turned
It is changed to digital signal and is sent to terminal；
The signal transmission module transmits for realizing the signal between data type conversion module and terminal.
It is connected between described sleeve pipe end shield earthing or grounding means and data type conversion module by quad.
The data type conversion module and signal transmission module are located in same shielding case body, are connected using board slot
It connects, signal transmission module is that cable is connect with terminal connection method.
Of the invention also discloses a kind of leakage current collection method, the Current Mutual Inductance integrated in bottom shielding of bushing earthing or grounding means
Initial current signal acquisition is analog signal by device, which is acquired and is converted to number by data type conversion module
Word signal, signal transmission module convert digital signals into optical signal, digital signal are reconverted into after optical fiber transmits, finally
Digital signal is subsequently processed in the terminal.
The original end shield grounding shell of bottom shielding of bushing earthing or grounding means equivalent substitution.Fixing screws are screwed, gasket guarantees electricity
The reliability of gas connection, leakage current flow through wiring cone, the crust of the device as device axle center through end shield stem, final to pass through
Sleeve shell flows into the earth.Leakage Current passes through current transformer and flows into the earth, and of the invention is reasonable in design, to having thrown
When transporting bottom shielding of bushing transformation, only original end shield grounding shell need to be replaced with the bottom shielding of bushing earthing or grounding means in the present invention, tightened
Screw, end shield stem is bored with wiring and is reliably connected through angle spring, so that end shield and casing metal cage connection ensure that
The reliable ground of bottom shielding of bushing.
Scheme compared with the existing technology, the invention has the following advantages: described sleeve pipe end shield earthing or grounding means uses mould
Blockization design, current transformer is integrated into bottom shielding of bushing earthing or grounding means, is that one complete and the entirety simplified, realizes set
Pipe end shield reliable ground always；Meanwhile acquisition system is reasonable in design, and current signal is carried out in situ anti-interference data class
Type conversion, after anti-interference data type is converted on the spot, initial current signal can realize anti-interference remote transmission.
In addition, current transformer is integrated into end shield earthing or grounding means by the present invention, the two is the complete structure of integration,
And fixed form is identical with original end shield grounding shell, it is i.e. complete that original end shield grounding shell is replaced with end shield earthing or grounding means
At the transformation of end shield, the complexity of retrofit work is greatly simplified, it is subsequent that improved end shield disassembly installation, disassembly are easy
Field test personnel work belt come it is convenient, current signal is carried out in situ analog-to-digital conversion, avoids substation's complexity electromagnetism
The interference of environment improves the anti-interference ability and transmittability of data.
Detailed description of the invention
Fig. 1 is bottom shielding of bushing grounding device constructions schematic diagram of the present invention.
Fig. 2 is that acquisition system of the present invention constitutes figure.
Fig. 3 is Leakage Current acquisition system complete layout of the present invention.
In attached drawing: 1- rubber washer, the outer six side's screws of 2-, 3- washer, 4- attachment base, 5- rubber washer, hexagonal circle in 6-
Chapiter screw, 7- disc spring, 8- gland, 9- air plug, 10- wiring cone, 11- positioning sleeve, 12- current transformer, 13- canted coil spring.
Specific embodiment
The present invention is made with detailed description below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, bottom shielding of bushing earthing or grounding means of the invention, including the attachment base 4 being mounted on casing, attachment base 4
Interior is cavity, is mounted under the end shield of casing；Attachment base 4 includes that open-topped shell and lid are located at case top opening
Gland 8, the gland 8 is fixed on attachment base 4 by hexagon socket cap head screw 6, and the contact surface of gland 8 and attachment base 4
On be provided with rubber washer and realize closing to the top of attachment base 4, be provided with wiring cone 10, wiring cone in the cavity of attachment base 4
It is connected through a screw thread between 10 and attachment base 4, and the end of thread of wiring cone 10 is connected on gland 8；The other end of wiring cone 10
It is connected with end shield stem；Current transformer 12 is installed on wiring cone 10, current transformer 12 is set in wiring and bores 10 middle sections,
And current transformer 12 is fixed on wiring cone 10 by positioning sleeve 11, is combined into an entirety, positioning sleeve with end shield earthing or grounding means collection
11 are set on wiring cone 10, between attachment base 4 and current transformer 12；The current transformer 12 by with installation
Power supply and data transmission, the wiring cone 10 and end shield stem phase are realized in the connection of external aviation plug 9 at 4 top of attachment base
Even one end is provided with sleeve, is set on end shield stem by sleeve, and by oblique between sleeve lining and end shield stem
Coil spring 13 is connected.
As shown in Figure 1, in this example, bottom shielding of bushing earthing or grounding means uses modularized design, with the outer six side's screws in M6 × 20
Attachment base 4 is fixed on casing, gland 8 is fixed on attachment base 4 with the hexagon socket cap head screw of M4 × 20, wiring cone 10
With gland 8 using being threaded togather, current transformer 12 is fixed on wiring cone 10 by positioning sleeve 11, is grounded and is filled with end shield
It sets collection and is combined into an entirety, 12 upper end of current transformer has positioning sleeve 11 to be fixed, and the power supply of current transformer 12, data pass
It is defeated that the realization of external aviation plug 9 on gland 8 is fixed on by top.Device axle center is the wiring cone across current transformer
10, one end is connect with crust of the device, and the other end is connected by canted coil spring 13 with end shield stem, and rubber washer 1,5 is for close
Envelope, the original end shield grounding shell of bottom shielding of bushing earthing or grounding means equivalent substitution.Fixing screws are screwed, gasket guarantees electrical connection
Reliability, leakage current flows through wiring cone, the crust of the device in device axle center, finally through sleeve shell stream through end shield stem
Enter the earth.Leakage Current passes through current transformer and flows into the earth.When the bottom shielding of bushing that put into operation being transformed using dress of the invention, only
Original end shield grounding shell need to be replaced with to the modularization bottom shielding of bushing earthing or grounding means in the present invention, tighten screw, end shield lead
Column and wiring are bored to be reliably connected through angle spring, thus by end shield and casing metal cage connection, ensure that bottom shielding of bushing can
By ground connection.
Aviation plug at the top of end shield earthing or grounding means uses the not outdoor plug special of Switzerland's thunder of degree of protection IP68, remaining
Coupling part is all made of O-ring sealing, guarantees the leakproofness of bottom shielding of bushing.
For acquiring 330kV bottom shielding of bushing Leakage Current, as shown in Fig. 2, leakage current collection system of the invention, packet
Include: bottom shielding of bushing earthing or grounding means, data type conversion module, signal transmission module, signal transmission direction is shown in arrow in figure
Direction.Wherein, it is integrated with current transformer in bottom shielding of bushing earthing or grounding means, acquisition set under the premise of guaranteeing that casing ground connection is reliable
Pipe end shield leakage current；For data type conversion module arrangement near bottom shielding of bushing earthing or grounding means, function is by Current Mutual Inductance
The collected bottom shielding of bushing Leakage Current signal of device is converted to digital quantity by analog quantity and is input to signal transmission module；Signal passes
The function of defeated module is to convert digital signals into optical signal, in order to the transmission of distant-range high-precision lossless signal；Optical signal in
It is subsequently processed and analyzes after being converted into digital signal at terminal.
Current transformer is integrated into end shield earthing or grounding means, and Leakage Current is cleverly flowed through centre path current mutual inductance
Device measures Leakage Current.Externally the two is integrated complete structure, and fixed form and original end shield grounding shell are complete
It is exactly the same, after the fixing screws of original end shield grounding shell are screwed off, replace with this end shield earthing or grounding means and the screw that is tightened
The transformation for completing end shield, greatly simplifies the complexity of retrofit work.
As a whole, disassembly installation, disassembly are easy for end shield earthing or grounding means proposed by the present invention, for subsequent scene examination
The work belt for testing personnel is next convenient.It is connect in bottom shielding of bushing binding post and the present apparatus in addition, being improved by the application of canted coil spring
The connection reliability of line cone is designed in this way from the point of view of overall applicability and ensure that bottom shielding of bushing binding post is reliably connected with wiring cone,
And bottom shielding of bushing reliable ground, greatly improve the Earthing Reliability of end shield after transformation.
Current transformer acquisition in initial current signal sleeve end shield earthing or grounding means is analog signal, the analog signal
It is converted into digital signal in data type conversion module arrangement and is input into signal transmission module；Digital signal is in signal
Optical signal is converted in transmission module, the optical signal after optical fiber transmits is transferred to terminal progress after being converted into digital signal
Processing and analysis.
As shown in figure 3, of the invention also discloses a kind of leakage current collection method, integrated in bottom shielding of bushing earthing or grounding means
Current transformer by initial current signal acquisition be analog signal, which is acquired by data type conversion module
And digital signal is converted to, signal transmission module converts digital signals into optical signal, is reconverted into number after optical fiber transmits
Word signal, final digital signal are subsequently processed in the terminal.
It please refers to shown in Fig. 3, in the present embodiment, upper node is data type conversion module.The module is last close to casing
Shield earthing or grounding means, keeps the connecting line arrived between data type conversion module at current transformer aviation plug output most short, as far as possible
Avoid the decaying and distortion of analog signal.What the high-speed data acquisition card in data type conversion module exported current transformer
Analog signal carries out high-accuracy data acquisition, realizes analog quantity-digital quantity conversion of current signal, and digital galvanic current is believed
Number further be packaged arrange.Digital quantity signal is convenient for the processing and integration of data, while substantially increasing the anti-dry of measured signal
Disturb ability.
In addition, the function of signal transmission module include will digitize current signal to be converted to optical signal, and pass through optical fiber without
It is transferred to data processing centre (industrial personal computer or backstage) to damage.Optical fiber transmission signal has bandwidth, strong antijamming capability, loss
The characteristics of low, without temperature drift, is suitble to the transmission of distant-range high-precision data.
Claims (9)
1. bottom shielding of bushing earthing or grounding means, which is characterized in that including the attachment base (4) being mounted on casing, in the attachment base (4)
For cavity, it is mounted under the end shield of casing；Wiring cone (10) is provided in the cavity of the attachment base (4), (10) are bored in wiring
One end is fixed on attachment base (4), and the other end is connected with end shield stem；Current transformer is installed on the wiring cone (10)
(12), the current transformer (12) by connect with the external aviation plug (9) being mounted at the top of attachment base (4) realize supply
Electricity and data transmission.
2. bottom shielding of bushing earthing or grounding means according to claim 1, which is characterized in that the wiring cone (10) and end shield lead
The connected one end of column is provided with sleeve, is set on end shield stem by sleeve, and lead between sleeve lining and end shield stem
Canted coil spring (13) are crossed to be connected.
3. bottom shielding of bushing earthing or grounding means according to claim 1, which is characterized in that the current transformer (12) is set in
(10) middle section is bored in wiring, and current transformer (12) is fixed on wiring cone (10) by positioning sleeve (11), with end shield earthing or grounding means
Collection is combined into an entirety, and the positioning sleeve (11) is set on wiring cone (10), is located at attachment base (4) and current transformer (12)
Between.
4. bottom shielding of bushing earthing or grounding means according to claim 1, which is characterized in that the attachment base (4) is opened including top
The shell and lid of mouth are located at the gland (8) of case top opening, and the gland (8) is solid by hexagon socket cap head screw (6)
It realizes due to being provided with rubber washer on attachment base (4), and on gland (8) and the contact surface of attachment base (4) to attachment base (4) top
The closing in portion.
5. bottom shielding of bushing earthing or grounding means according to claim 4, which is characterized in that the wiring cone (10) and attachment base
(4) it is connected through a screw thread between, and the end of thread of wiring cone (10) is connected on gland (8).
6. based on the leakage current collection system of the described in any item bottom shielding of bushing earthing or grounding means of claim 1-5, feature exists
In, comprising: bottom shielding of bushing earthing or grounding means, data type conversion module, signal transmission module, in which:
Initial current signal acquisition is analog signal by the current transformer integrated in described sleeve pipe end shield earthing or grounding means, and is sent
Give data type conversion module；
The data type conversion module is used to receive the analog signal of current transformer, and the analog signal is converted to
Digital signal is sent to terminal；
The signal transmission module transmits for realizing the signal between data type conversion module and terminal.
7. leakage current collection system according to claim 6, which is characterized in that described sleeve pipe end shield earthing or grounding means and number
It is connected according between type conversion module by quad.
8. leakage current collection system according to claim 6, which is characterized in that the data type conversion module and letter
Number transmission module is located in same shielding case body, is connected using board slot, and signal transmission module and terminal connection method are net
Line connection.
9. the acquisition method based on the described in any item leakage current collection systems of claim 6-8, which is characterized in that casing end
Shielding the current transformer integrated in earthing or grounding means for initial current signal acquisition is analog signal, and data type conversion module should
Analog signal is acquired and is converted to digital signal, and signal transmission module converts digital signals into optical signal, by optical fiber
Digital signal is reconverted into after transmission, final digital signal is subsequently processed in the terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910411826.XA CN110196350A (en) | 2019-05-17 | 2019-05-17 | Bottom shielding of bushing earthing or grounding means, leakage current collection system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910411826.XA CN110196350A (en) | 2019-05-17 | 2019-05-17 | Bottom shielding of bushing earthing or grounding means, leakage current collection system and method |
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| Publication Number | Publication Date |
|---|---|
| CN110196350A true CN110196350A (en) | 2019-09-03 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910411826.XA Pending CN110196350A (en) | 2019-05-17 | 2019-05-17 | Bottom shielding of bushing earthing or grounding means, leakage current collection system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112452819A (en) * | 2020-11-02 | 2021-03-09 | 广东电网有限责任公司 | High-voltage bushing tap grounding detection and online monitoring device |
| CN114167184A (en) * | 2021-12-06 | 2022-03-11 | 国网新疆电力有限公司电力科学研究院 | Sleeve and mutual inductor end screen online monitoring networking system and method based on Internet of things |
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