CN209657987U - Ring network cabinet anti-resonance potential transformer - Google Patents
Ring network cabinet anti-resonance potential transformer Download PDFInfo
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- CN209657987U CN209657987U CN201920747548.0U CN201920747548U CN209657987U CN 209657987 U CN209657987 U CN 209657987U CN 201920747548 U CN201920747548 U CN 201920747548U CN 209657987 U CN209657987 U CN 209657987U
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- voltage
- potential transformer
- network cabinet
- iron core
- ring network
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Abstract
The utility model relates to electrical equipment technical fields, provide a kind of ring network cabinet anti-resonance potential transformer, comprising: are poured the zero sequential potential transformer and three voltage transformers with no-load voltage ratio being integrated；Three voltage transformers with no-load voltage ratio form YYO formula connection, and A, B, C phase of the voltage transformer are respectively used to connect corresponding looped network cabinet wire A, B, C three-phase；The zero sequential potential transformer includes: first voltage iron core and zero sequence coil；The voltage transformer includes: a terminal, primary coil, secondary coil, second voltage iron core and secondary terminals；The second voltage iron core is annular, and secondary coil is wound on the side stem of the second voltage iron core, winds primary coil on the outside of the secondary coil；The output end of the primary coil draws a terminal, and the output end of the secondary coil draws secondary terminals.The utility model can play the role of current limliting and inhibit resonance, ensure mutual inductor operational safety.
Description
Technical field
The utility model relates to electrical equipment technical field more particularly to a kind of ring network cabinet anti-resonance potential transformers.
Background technique
The Vv formula mode of connection for two voltage transformers composition that voltage transformer used in the ring network cabinet of city now uses, only
Can measure AC phase, metering cannot accomplish each phase metering, after use the YYO modes of connection of three voltage transformer one instead.But
Often there is three-phase imbalance problem on the line in such mutual inductor, and line over-voltage is also easy to appear problem.Neutral point not
In the non-direct ground system of ground connection, it is to cause thing that ferro-resonance over-voltage caused by iron electromagnetic type voltage transformer, which is common,
Therefore a kind of more internal overvoltage.This overvoltage gently then makes fuse failure of voltage transformer, heavy then to burn voltage mutual
Sensor, or even demolition porcelain insulator and arrester cause system shutdown.It is existing that series resonance can be generated under certain power supply effect
As leading to occur serious resonance overvoltage in system.
Utility model content
The utility model, which mainly solves existing threephase potential transformer, often to be occurred three-phase imbalance on the line, inhibits humorous
The technical problems such as phenomenon of shaking generation, propose a kind of ring network cabinet anti-resonance potential transformer, can play current limliting and inhibit resonance
Effect, ensure mutual inductor operational safety, achieve the effect that three-phase line single-phase measurement, measuring accuracy is accurate.It is mutual to adapt to voltage
The operation of sensor full working scope.
The utility model provides a kind of ring network cabinet anti-resonance potential transformer, comprising: is poured one zero be integrated
Sequence voltage mutual inductor and three voltage transformers with no-load voltage ratio；
Three voltage transformers with no-load voltage ratio form YYO formula connection, and A, B, C phase of the voltage transformer are respectively used to connect
Connect corresponding looped network cabinet wire A, B, C three-phase；The N of three voltage transformers is in parallel in one and connects zero sequential potential transformer
The N phase of A phase, the zero sequential potential transformer is used to be grounded；
The zero sequential potential transformer includes: first voltage iron core and zero sequence coil (6)；The first voltage iron core is ring
Shape, the zero sequence coil (6) are wrapped on the side stem of first voltage iron core；One end connection zero of the zero sequence coil (6)
O phase, the N phase of other end connection zero sequence transformer of sequence mutual inductor；
The voltage transformer include: a terminal (1), primary coil (2), secondary coil, second voltage iron core (3) and
Secondary terminals (4)；The second voltage iron core (3) is annular, is wound on the side stem of the second voltage iron core (3) secondary
Coil, the secondary coil outside wind primary coil (2)；The output end of the primary coil (2) draws a terminal (1),
The output end of the secondary coil draws secondary terminals (4).
Preferably, mounting base is arranged in the bottom of the ring network cabinet anti-resonance potential transformer.
Preferably, fuse built in the ring network cabinet anti-resonance potential transformer.
Preferably, the fuse is once intracavitary by American spindle nose insertion mutual inductor.
Preferably, a terminal (1) uses American spindle nose.
Preferably, a zero sequential potential transformer and three voltage transformers with no-load voltage ratio are poured by epoxy resin (5)
Integrally.
A kind of ring network cabinet anti-resonance potential transformer provided by the utility model is formed, three using 4PT voltage transformer
Phase voltage mutual inductor forms YYO formula wiring by three voltage transformers, and N-terminal is connected in parallel the end A of zero sequential potential transformer, zero sequence
The N-terminal of voltage transformer is grounded, and can be played the role of current limliting and be inhibited resonance.Using good epoxide resin vacuum casting one
It is body formed.Inscribed fuse has small in size, light-weight, noiseless, Maintenance free using American spindle nose, plug-in installation,
Overvoltage ability is strong, and has the function of anti-electricity-theft device.Built-in fuse, route go wrong, and high current is passed through, fusing
Device plays the role of current limliting, blocking.Mutual inductor operational safety is protected, a terminal uses American spindle nose, plug installation, fuse
Damage replacement is convenient, safe and applicable.And realize metering, it measures, protects integrated function.
Detailed description of the invention
Fig. 1 is the structural schematic diagram one of ring network cabinet anti-resonance potential transformer provided by the utility model；
Fig. 2 is the structural schematic diagram two of ring network cabinet anti-resonance potential transformer provided by the utility model；
Fig. 3 is the wiring schematic diagram of the utility model under normal circumstances；
Fig. 4 is the voltage vector diagram of the utility model under normal circumstances；
Fig. 5 is voltage vector diagram when the utility model zero sequential potential transformer A phase is grounded.
Appended drawing reference: a 1, terminal；2, primary coil；3, second voltage iron core；4, secondary terminals；5, epoxy resin；
6, zero sequence coil.
Specific embodiment
The technical issues of to solve the utility model, the technical solution of use and the technical effect that reaches are clearer,
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that described herein
Specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It also should be noted that being
Convenient for description, part relevant to the utility model is illustrated only rather than full content in attached drawing.
Fig. 1 is the structural schematic diagram one of ring network cabinet anti-resonance potential transformer provided by the utility model；Fig. 2 is this reality
With the structural schematic diagram two of the ring network cabinet anti-resonance potential transformer of novel offer.As shown in Figure 1, 2, the utility model is implemented
The ring network cabinet anti-resonance potential transformer that example provides, comprising: be poured a zero sequential potential transformer being integrated and three same
The voltage transformer of no-load voltage ratio.The epoxy resin that one zero sequential potential transformer and three voltage transformers with no-load voltage ratio pass through insulation
5 pour into an integrated entity.
Three voltage transformers with no-load voltage ratio form YYO formula connection, and A, B, C phase of the voltage transformer are respectively used to connect
Connect corresponding looped network cabinet wire A, B, C three-phase；The N of three voltage transformers is in parallel in one and connects zero sequential potential transformer
The N phase of A phase, the zero sequential potential transformer is used to be grounded；
The zero sequential potential transformer includes: first voltage iron core and zero sequence coil 6；The first voltage iron core is ring
Shape, the zero sequence coil 6 are wrapped on the side stem of first voltage iron core；One end connection zero sequence of the zero sequence coil 6 is mutual
O phase, the N phase of other end connection zero sequence transformer of sensor；
The voltage transformer includes: a terminal 1, primary coil 2, secondary coil, second voltage iron core 3 and secondary terminals
Son 4；The second voltage iron core 3 is annular, winds secondary coil on the side stem of the second voltage iron core 3, described two
Primary coil 2 is wound on the outside of secondary coil, i.e., first winds secondary coil on the side stem of second voltage iron core 3, then is wound primary
Coil 2, primary coil 2 is in the periphery of secondary coil；The output end of the primary coil 2 draws a terminal 1, the primary end
Son 1 uses American spindle nose.The output end of the secondary coil draws secondary terminals 4.Ring network cabinet antiresonance mutual induction of voltage
Mounting base is arranged in the bottom of device.
In addition, fuse built in the ring network cabinet anti-resonance potential transformer.The fuse is inserted by American spindle nose
It is once intracavitary to enter mutual inductor.Dedicated fuse is fixed on American spindle nose, and insertion mutual inductor is once intracavitary, is made by fixinig plate
American spindle nose is fixed tight.
Fig. 3 is the wiring schematic diagram under the utility model normal operation；Fig. 4 be the utility model under normal circumstances
Voltage vector diagram.As shown in Figure 3,4, under normal circumstances, voltage transformer secondary side a-o, b-o, c-o are respectively connected to relatively absolutely
Edge monitors that voltmeter, residual voltage circuit breaker connect in t2Between mutual inductor secondary side X '-O.Using this wiring, under normal circumstances, T1
Mutual inductor only reflects positive sequence voltageThree-phase voltage is equal in magnitude, and 120 ° of phase difference, neutral point potential zero,
Namely Ux’=0.And when A phase metallic earthing, vectogram is as shown in figure 4, i.e. Ux’=Uo=Ua, external at this time zero sequence relay
There are voltage, i.e., capable of emitting ground signalling in the both ends device YJ, and the numerical value of b phase voltage table reflection should be It is equal to line voltage, C phase voltage tableIt is also equal to line voltage.
Such wiring can reduce influence of the line over-voltage to mutual inductor.
Fig. 5 is voltage vector diagram when the utility model zero sequential potential transformer A phase is grounded.As shown in figure 5, and when generation
When ground connection, when such as A phase metallic earthing, voltage reflection is just incorrect, then B phase voltage table is the voltage of b-x ', because
Ux’=-Ua, i.e., Therefore
Three-phase voltage meter still balances, and is phase voltage, and can issue ground signalling at this time, because ground signalling relay connects in t2Line
On circle, substitution connects at open-delta in the past, and UxThere is the residual voltage of 50V or so, coil both ends are acted because there is voltage,
When system voltage or route resonance occurred in route, when overvoltage acts on mutual inductor, it is big to act on voltage transformer
Electric current is grounded by zero sequential potential transformer, and the big resistance of zero sequential potential transformer high pressure plays the role of current limliting and inhibits resonance.
The working principle of ring network cabinet anti-resonance potential transformer provided by the utility model: when route has ground connection or generation
High current.When high current passes through, when the fuse in mutual inductor reaches blowout current, fuse fuse failure, so that protection is mutual
Sensor, when resonance overvoltage occurs in route, instant high-voltage flows through fuse, and fuse melts because volt-second characteristic fails moment
Break to protect mutual inductor, mutual inductor once just has high voltage at this time, and 3 times or 5 subharmonic are had in high voltage, and mutual inductor is easy height
Pressure is saturated mutual inductor iron core, generates high current once passing through from mutual inductor, this is to the damage and failure of voltage transformer
It is maximum, but have zero sequential potential transformer, it is equivalent to a high-tension resistive current limliting, earth current is made to become smaller.To which protection is mutual
Sensor is not damaged.It is grounded earliest using by high-tension resistive, since the heat that high current, high voltage generate just compares
Greatly, it is desirable that high-tension resistive capacity it is bigger, high-tension resistive is easy to burn or since overheat reduces service life thus, after
High-tension resistive is replaced using zero sequential potential transformer, since mutual inductor has iron core, substantially increases capacity, line footpath
The ability that mentioning makes greatly mutual inductor bear high current improves.
Ring network cabinet anti-resonance potential transformer provided by the utility model, threephase potential transformer is by three mutual induction of voltage
Device forms the wiring of YYO formula, and N-terminal is connected in parallel the end A of zero sequential potential transformer, the N-terminal ground connection 4PT one of zero sequential potential transformer
Formula structure.Built-in fuse, if route goes wrong, high current is passed through, and fuse plays the role of current limliting, blocking.It protects
Mutual inductor operational safety is protected, a terminal uses American spindle nose, and plug installation, fuse damage replacement is convenient, safe and applicable.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should
Understand: it is modified the technical solutions described in the foregoing embodiments, or to some or all of the technical features
It is equivalently replaced, the scope of the technical solutions of the embodiments of the utility model that it does not separate the essence of the corresponding technical solution.
Claims (6)
1. a kind of ring network cabinet anti-resonance potential transformer characterized by comprising it is mutual to be poured a residual voltage being integrated
Sensor and three voltage transformers with no-load voltage ratio；
Three voltage transformers with no-load voltage ratio form YYO formula connection, and A, B, C phase of the voltage transformer are respectively used to connection pair
Answer looped network cabinet wire A, B, C three-phase；The N of three voltage transformers is in parallel in one and connects the A phase of zero sequential potential transformer,
The N phase of the zero sequential potential transformer is used to be grounded；
The zero sequential potential transformer includes: first voltage iron core and zero sequence coil (6)；The first voltage iron core is annular,
The zero sequence coil (6) is wrapped on the side stem of first voltage iron core；One end connection zero sequence of the zero sequence coil (6) is mutual
O phase, the N phase of other end connection zero sequence transformer of sensor；
The voltage transformer includes: a terminal (1), primary coil (2), secondary coil, second voltage iron core (3) and secondary
Terminal (4)；The second voltage iron core (3) is annular, winds secondary line on the side stem of the second voltage iron core (3)
Circle, the secondary coil outside wind primary coil (2)；The output end of the primary coil (2) draws a terminal (1), institute
The output end for stating secondary coil draws secondary terminals (4).
2. ring network cabinet anti-resonance potential transformer according to claim 1, which is characterized in that the ring network cabinet is humorous with resisting
Mounting base is arranged in the bottom of vibration voltage transformer.
3. ring network cabinet anti-resonance potential transformer according to claim 1, which is characterized in that the ring network cabinet is humorous with resisting
Shake fuse built in voltage transformer.
4. ring network cabinet anti-resonance potential transformer according to claim 3, which is characterized in that the fuse passes through beauty
It is once intracavitary that formula spindle nose is inserted into mutual inductor.
5. ring network cabinet anti-resonance potential transformer according to claim 1, which is characterized in that a terminal (1)
Using American spindle nose.
6. ring network cabinet anti-resonance potential transformer according to claim 1, which is characterized in that a residual voltage mutual inductance
Device and three voltage transformers with no-load voltage ratio are poured into an integrated entity by epoxy resin (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920747548.0U CN209657987U (en) | 2019-05-23 | 2019-05-23 | Ring network cabinet anti-resonance potential transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920747548.0U CN209657987U (en) | 2019-05-23 | 2019-05-23 | Ring network cabinet anti-resonance potential transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209657987U true CN209657987U (en) | 2019-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920747548.0U Expired - Fee Related CN209657987U (en) | 2019-05-23 | 2019-05-23 | Ring network cabinet anti-resonance potential transformer |
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| CN (1) | CN209657987U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114050040A (en) * | 2021-11-24 | 2022-02-15 | 镇江市丹高电器有限公司 | Large-capacity three-phase voltage transformer |
-
2019
- 2019-05-23 CN CN201920747548.0U patent/CN209657987U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114050040A (en) * | 2021-11-24 | 2022-02-15 | 镇江市丹高电器有限公司 | Large-capacity three-phase voltage transformer |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191119 Termination date: 20210523 |