CN209881406U - Improved transformer neutral point complete device - Google Patents
Improved transformer neutral point complete device Download PDFInfo
- Publication number
- CN209881406U CN209881406U CN201920608254.XU CN201920608254U CN209881406U CN 209881406 U CN209881406 U CN 209881406U CN 201920608254 U CN201920608254 U CN 201920608254U CN 209881406 U CN209881406 U CN 209881406U
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- neutral point
- transformer
- arrester
- connecting hole
- isolator
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Abstract
The utility model discloses a modified transformer neutral point integrated equipment, which comprises a bracket, install neutral point isolator, neutral point arrester and neutral point current transformer on the support, isolator binding post is installed at neutral point isolator top, last transformer neutral point connecting hole and the arrester connecting hole of being provided with of isolator binding post, transformer neutral point connecting hole be used for with transformer neutral point draw wire connect, the arrester connecting hole be used for with isolator and arrester be connected, transformer neutral point connecting hole is provided with four altogether, the arrester connecting hole is provided with two altogether, be provided with neutral point discharge gap between neutral point arrester and the neutral point current transformer. The utility model discloses, 2 holes in isolator binding post right side are used for isolator to be connected with the arrester, have increased neutral point integrated level, are favorable to the inside process control of product, improve equipment reliability.
Description
Technical Field
The utility model relates to a power equipment technical field specifically is a modified transformer neutral point integrated equipment.
Background
The transformer neutral point gap protection device (hereinafter referred to as a neutral point complete device) is a complete device which integrates electrical equipment such as an isolating switch, a zinc oxide arrester, a discharge gap, a current transformer and the like. In the 110kV, 220kV and 330kV voltage grades in China, because the voltage is very high, a neutral point generally adopts a direct grounding mode, and because of the requirements of relay protection setting configuration, communication interference prevention and the like, in order to limit single-phase short-circuit current, partial transformers adopt a neutral point ungrounded mode. In this operation mode, lightning strike, single-phase short-circuit fault and the like can cause neutral point overvoltage, and most transformers are in graded insulation, so that the overvoltage threatens the insulation of the neutral point greatly, and a protection device must be arranged on the neutral point to prevent accidents.
The transformer neutral point complete device realizes the action of the lightning arrester and the non-action of the gap under high-frequency transient overvoltage (lightning overvoltage and operation harmonic overvoltage) by using the lightning arrester and the gap in a matched manner and utilizing the discharge time delay of the gap discharge and the characteristic that the metal oxide lightning arrester has no discharge time delay; under power frequency overvoltage (single-phase grounding overvoltage), the gap acts to realize rapid protection. In addition, the volt-second curve of the gap and the lightning arrester is below the insulation volt-second characteristic curve of the transformer so as to realize insulation matching with the transformer and protect the insulation of the transformer.
In the voltage grades of 110KV, 220KV and 330KV power transformers, a neutral point complete set device is connected with a neutral point sleeve terminal of the transformer through a conductor, and the neutral point complete set device is widely applied to power plants and power stations such as thermoelectricity, hydropower, wind power generation and the like.
The original wiring mode is as follows: the method is characterized in that a user self-contained conductor is connected with a neutral point lightning arrester leading-out copper bar or aluminum bar in a crimping mode through a neutral point isolating switch wiring terminal, and then the neutral point lightning arrester leading-out copper bar or aluminum bar is connected in a bolting mode. This approach has the following disadvantages: this mode is only applicable to copper bar or the wiring of aluminium bar hard conductor, and when neutral point equipment and main transformer had direction angle and discrepancy in elevation, connecting conductor installation was inconvenient, had certain construction degree of difficulty. The same conductor needs to be connected with 2 equipment terminals of isolator, arrester, because conductor own hard power and external factor have increased the conductor and have generated the probability, influence the whole reliability of using of equipment such as the condition such as virtual connection.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a modified transformer neutral point integrated equipment to solve the problem among the prior art.
In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a modified transformer neutral point integrated equipment, includes the support, install neutral point isolator, neutral point arrester and neutral point current transformer on the support, isolator binding post is installed at the neutral point isolator top, last transformer neutral point connecting hole and the arrester connecting hole of being provided with of isolator binding post, transformer neutral point connecting hole be used for drawing forth the wire with transformer neutral point and be connected, the arrester connecting hole be used for being connected with isolator and arrester, transformer neutral point connecting hole is provided with four altogether, the arrester connecting hole is provided with two altogether, be provided with neutral point discharge gap between neutral point arrester and the neutral point current transformer, the support bottom is provided with the earth connection.
Preferably, the neutral point discharge gap is set to be 250-320 mm.
Preferably, the support and the foundation are fixed through bolts, and the support is provided with an operating mechanism.
Preferably, a knife switch is arranged on the left side of the neutral point isolating switch.
Preferably, the neutral point discharge gap is connected to a ground line.
Compared with the prior art, the beneficial effects of the utility model are that:
1. 4 holes in the left side of the isolating switch wiring terminal are used for leading out a lead from a neutral point of the transformer to be connected, a user-provided conductor can be connected by adopting a hard conductor and a soft lead matched with a hardware fitting, and wiring is more flexible;
2. 2 holes in the right side of the isolating switch wiring terminal are used for connecting the isolating switch with the lightning arrester, so that the integration level of the neutral point complete device is increased, the internal process control of a product is facilitated, and the reliability of equipment is improved;
3. the number of the transformer neutral point and neutral point complete equipment connecting points is 1, and a user can use and install the neutral point complete equipment more conveniently.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is a left side view of the present invention.
Fig. 3 is a top view of the present invention.
Fig. 4 is a schematic structural diagram of the connection terminal of the isolating switch of the present invention.
In the figure: 1-neutral point isolation switch; 2-neutral point discharge gap; 3-neutral lightning arrester; 4-neutral point current transformer; 5-a bracket; 6-an operating mechanism; 7-a ground line; 8-bolt; 9-a disconnecting switch wiring terminal; 10-transformer neutral point connection hole; 11-arrester attachment hole.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-4, in the embodiment of the present invention, an improved transformer neutral point complete set device includes a bracket 5, a neutral point isolation switch 1, a neutral point arrester 3 and a neutral point current transformer 4 are installed on the bracket 5, an isolation switch connection terminal 9 is installed on the top of the neutral point isolation switch 1, a transformer neutral point connection hole 10 and an arrester connection hole 11 are installed on the isolation switch connection terminal 9, the transformer neutral point connection hole 10 is used for connecting with a transformer neutral point lead-out wire, the arrester connection hole 11 is used for connecting with the isolation switch and the arrester, four transformer neutral point connection holes 10 are provided, two arrester connection holes 11 are provided, a neutral point discharge gap 2 is provided between the neutral point arrester 3 and the neutral point current transformer 4, a ground wire 7 is provided at the bottom end of the bracket 5, the neutral point discharge gap 2 is set to be 250-320mm, the bracket 5 and the foundation are fixed through a bolt 8, an operating mechanism 6 is arranged on the bracket 5, a knife switch is arranged on the left side of the neutral point isolating switch 1, and the neutral point discharging gap 2 is connected with a grounding wire 7; 4 holes in the left side of the isolating switch wiring terminal 9 are used for leading out a lead from a neutral point of the transformer to be connected, a user-provided conductor can be connected by adopting a hard conductor and a soft lead matched with a hardware fitting, and wiring is more flexible; 2 holes on the right side of the disconnecting switch wiring terminal 9 are used for connecting the disconnecting switch with the lightning arrester, so that the integration level of the neutral point complete device is increased, the internal process control of a product is facilitated, and the reliability of equipment is improved; the number of the transformer neutral point and neutral point complete equipment connecting points is 1, and a user can use and install the neutral point complete equipment more conveniently.
The utility model discloses a theory of operation is: when the isolating switch is used, 4 holes in the left side of the isolating switch wiring terminal 9 are used for leading out a lead from a neutral point of a transformer for connection, a user-owned conductor can be connected by adopting a hard conductor and a soft lead matched with a hardware fitting, and wiring is more flexible; 2 holes on the right side of the disconnecting switch wiring terminal 9 are used for connecting the disconnecting switch with the lightning arrester, so that the integration level of the neutral point complete device is increased, the internal process control of a product is facilitated, and the reliability of equipment is improved; the number of the transformer neutral point and neutral point complete equipment connecting points is 1, and a user can use and install the neutral point complete equipment more conveniently.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (5)
1. An improved transformer neutral point kit, comprising a bracket (5), characterized in that: a neutral point isolating switch (1), a neutral point lightning arrester (3) and a neutral point current transformer (4) are arranged on the bracket (5), the top of the neutral point isolating switch (1) is provided with an isolating switch wiring terminal (9), the isolating switch wiring terminal (9) is provided with a transformer neutral point connecting hole (10) and a lightning arrester connecting hole (11), the transformer neutral point connecting hole (10) is used for being connected with a lead wire led out of a transformer neutral point, the lightning arrester connecting hole (11) is used for being connected with the isolating switch and a lightning arrester, the transformer neutral point connecting holes (10) are provided with four, the lightning arrester connecting holes (11) are provided with two, a neutral point discharge gap (2) is arranged between the neutral point lightning arrester (3) and the neutral point current transformer (4), and a grounding wire (7) is arranged at the bottom end of the support (5).
2. An improved transformer neutral kit as set forth in claim 1, wherein: the neutral point discharge gap (2) is set to 250-320 mm.
3. An improved transformer neutral kit as set forth in claim 1, wherein: the support (5) and the foundation are fixed through bolts (8), and the support (5) is provided with an operating mechanism (6).
4. An improved transformer neutral kit as set forth in claim 1, wherein: and a knife switch is arranged on the left side of the neutral point isolating switch (1).
5. An improved transformer neutral kit as set forth in claim 1, wherein: the neutral point discharge gap (2) is connected with a grounding wire (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920608254.XU CN209881406U (en) | 2019-04-29 | 2019-04-29 | Improved transformer neutral point complete device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920608254.XU CN209881406U (en) | 2019-04-29 | 2019-04-29 | Improved transformer neutral point complete device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209881406U true CN209881406U (en) | 2019-12-31 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920608254.XU Active CN209881406U (en) | 2019-04-29 | 2019-04-29 | Improved transformer neutral point complete device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209881406U (en) |
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2019
- 2019-04-29 CN CN201920608254.XU patent/CN209881406U/en active Active
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