CN202172054U - A demarcation load switch - Google Patents
A demarcation load switch Download PDFInfo
- Publication number
- CN202172054U CN202172054U CN201120297761XU CN201120297761U CN202172054U CN 202172054 U CN202172054 U CN 202172054U CN 201120297761X U CN201120297761X U CN 201120297761XU CN 201120297761 U CN201120297761 U CN 201120297761U CN 202172054 U CN202172054 U CN 202172054U
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- phase current
- mutual inductor
- housing
- current mutual
- switch
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Abstract
The utility model relates to a power switch for a power transmission line and provides a demarcation load switch has obviously reduced cost and widened application. The demarcation load switch comprises a switch body and an intelligent control device, which are connected with each other electrically. The switch body comprises a housing, an insulation draw bar, vacuum extinction chambers, a voltage transformer, an A phase current transformer, a B phase current transformer, a C phase current transformer and a spring operation mechanism; the A phase current transformer, the B phase current transformer and the C phase current transformer are provided with a common low voltage side neutral line; and the intelligent control device comprises a housing and a control device disposed in the housing. The demarcation load switch is characterized in that a zero sequence transformer is disposed in the housing of the intelligent control device and disposed on the neutral line, which is grounded.
Description
Technical field
The utility model relates to a kind of power switch that is used in the defeated modified line, especially relates to a kind of demarcation load switch of installing, being used for the outdoor subscriber boundary that is applicable on the outdoor post.
Background technology
The demarcation load switch that is used on the outdoor post installing, to be used for the outdoor subscriber boundary generally comprises Switch main body and intelligence controlling device, and Switch main body comprises zero sequence current mutual inductor.Zero sequence current mutual inductor plays the zero-sequence current protection effect.The basic principle of zero-sequence current protection is based on Kirchhoff's current law (KCL): the algebraical sum that flows into the telegram in reply stream of arbitrary node in the circuit equals zero.Under circuit and the normal situation of electric equipment, the vector of each phase current with equal zero, the secondary side winding no signal of zero sequence current mutual inductor is exported like this, executive component is failure to actuate.The vector of each phase current when earth fault takes place and non-vanishing; Fault current makes in the annular core of zero sequence current mutual inductor and produces magnetic flux; The secondary side induced voltage of zero sequence current mutual inductor makes the executive component action; Drive trip gear, switch supply network, reach the purpose of earth fault protection.
Existing demarcation load switch generally comprises Switch main body and intelligence controlling device (referring to Fig. 1～3, wherein intelligence controlling device does not draw), and Switch main body is electrically connected with intelligence controlling device.Switch main body is provided with housing 1, and insulated tension pole 2, high pressure once go between end of incoming cables 31 (A phase), 32 (B phases) and 33 (C mutually); High pressure once goes between leading-out terminal 31 ' (A phase), 32 ' (B phase) and 33 ' (C mutually); Ceramic vacuum arc control device 4 (3), insulating cover 5 (3), spring operating mechanism 7; Voltage transformer 9 is measured protective current instrument transformer 6 and ZCT 8.Visible by Fig. 1～3, ZCT 8 is located in the housing 1 of Switch main body, and is connected on the high pressure leading-out terminal that once goes between, and three phase lines (A phase, B mutually and C mutually) are passed zero sequence current mutual inductor 8 together, and ground protection also is to be located at the high pressure primary side.Problems such as there is following shortcoming in such structure: the zero sequence current mutual inductor small product size is big, and it is big to take up room, thereby makes the shell dimension of Switch main body want big, and insulating properties requires high, can bring trouble is installed, and manufacturing cost is high, and functional reliability is influenced.In addition because the housing size of existing Switch main body has been to have formed certain standard specification series; Therefore generally can not change the corresponding size standard; Owing to receive size restrictions; Limited the range of application of demarcation load switch, generally only be applicable to the demarcation load switch (as being used for ZW20-10 type demarcation load switch) of model, the demarcation load switch of other model is then awkward to use.
Publication number is that the application for a patent for invention of CN101282033 discloses a kind of automatic user-isolated end fault, prevented that the user side accident from feeding through to the user demarcation load switch of power distribution network.The utility model comprises Switch main body (1), measurement and control unit (2), connects plug connector (3); Said connection plug connector (3) comprises plug, socket and cable; Said Switch main body (1) is electrically connected through the said plug connector (3) that is connected with said measurement and control unit (2); Said Switch main body (1) comprises isolating switch (11), vacuum load switch (12), ZCT (13), observing and controlling voltage transformer (14), observing and controlling current transformer (15,16); Said measurement and control unit (2) comprises AC sampling module (21), control output module (22), guidance panel (23), communication interface (24) and CPU (25); This invention is applicable to the built on stilts net of city 10kV distribution line, and product extensively is installed on the T of user branch contact.
The patent No. is that the Chinese utility model patent of ZL200620122673.5 discloses a kind of intelligent demarcation load switch; It comprises control of intelligent terminal, zero sequence current mutual inductor, current sensor, voltage sensor, supply transformer and actuator; Said zero sequence current mutual inductor is used to gather the zero sequence current signal of circuit, and said current sensor is used to gather the current signal of circuit, and said voltage sensor is used to gather the voltage signal of circuit; Said supply transformer is coupled with distribution line; Its output is used for to switch power supply itself, and said control of intelligent terminal is analyzed and logical operation said zero sequence current signal, current signal and voltage signal, when line fault occurring, generates the protection control signal according to the program of setting; Deliver to said actuator, said actuator can excise faulty line fast.This utility model good reliability, running parameter can be set as required, and can use for a long time, mainly can be applicable to distribution backbone network branch line and user entry place.
Summary of the invention
The purpose of the utility model provides and a kind ofly can significantly reduce cost, the demarcation load switch of expanding application scope.
The utility model comprises Switch main body and intelligence controlling device; Switch main body is electrically connected with intelligence controlling device; Switch main body comprises housing, insulated tension pole, vacuum interrupter, voltage transformer, A phase current mutual inductor, B phase current mutual inductor, C phase current mutual inductor and spring operating mechanism; A phase current mutual inductor, B phase current mutual inductor, C phase current mutual inductor are provided with the shared low-pressure side neutral line, and intelligence controlling device comprises housing and the control device of being located in the housing; Its characteristics are, are provided with ZCT in the housing of intelligence controlling device, and ZCT is located on the said neutral line, neutral earthing.
Compare with prior art, the utlity model has following outstanding advantage:
Because the utility model places zero sequence current mutual inductor in the intelligence controlling device housing; And be connected with A phase current mutual inductor, B phase current mutual inductor, the shared low-pressure side neutral line N of C phase current mutual inductor; Changed the internal structure of existing demarcation load switch; Therefore bring significant technique effect, be mainly reflected in:
1) insulation is handled easily.
2) range of application can contain all vacuum circuit-breakers.
3) manufacturing cost reduces (escapable cost about 1/3) greatly.
4) the ZCT cost be original adapted ZCT 1/10, volume significantly reduces, installation and maintenance are very easy.
Description of drawings
Fig. 1 is the side direction internal structure sketch map of the Switch main body of existing demarcation load switch.
Fig. 2 bows to the internal structure sketch map for the Switch main body of existing demarcation load switch.
Fig. 3 is the connection principle sketch map of the ZCT of existing demarcation load switch.
Fig. 4 is the side direction internal structure sketch map of the Switch main body of the utility model embodiment.
Fig. 5 is bowing to the internal structure sketch map of the utility model embodiment (comprising Switch main body and intelligence controlling device).
Fig. 6 is the connection principle sketch map of the ZCT of the utility model embodiment.
Embodiment
Referring to Fig. 4～6, the utility model embodiment comprises Switch main body and intelligence controlling device, and Switch main body is electrically connected with intelligence controlling device.The similar of Switch main body and Fig. 1 and 2; Difference is: A phase current mutual inductor 61 is located at the high pressure end of incoming cables 31 that once goes between; C phase current mutual inductor 63 is located at the high pressure end of incoming cables 32 that once goes between, and B phase current mutual inductor 62 is located at the high pressure leading-out terminal 32 ' that once goes between.A phase current mutual inductor 61, B phase current mutual inductor 62, C phase current mutual inductor 63 are provided with shared low-pressure side neutral line n (see figure 6); Intelligence controlling device comprises housing 1 ', is located at ZCT 8 ' and other control device (see Fig. 5, other control device does not draw) in the housing 1 '; ZCT 8 ' is located at said neutral line n and is gone up (see figure 6), neutral line n ground connection.The utility model embodiment is located at ZCT 8 ' in the housing 1 ' of intelligence controlling device, and ZCT 8 ' is connected with the neutral line n that is located at low-pressure side, can bring significant advantage like this: insulation is handled easily; Range of application can contain all vacuum circuit-breakers; Manufacturing cost reduces (escapable cost about 1/3) greatly; And install very easy.Through the test, ZCT 8 ' cost be original adapted ZCT 1/10.Manufacturing cost is about original 1/3.The most important thing is that range of application enlarges, need satisfy ground protection originally, can only select the vacuum circuit-breaker of ZW20-10 type, and adopt the utility model technical scheme, then existing ZW series vacuum circuit-breaker all can satisfy the functional requirement of ground protection.A, B and C represent to be positioned on high-tension side three phase lines among Fig. 4; A, b and c represent to be positioned at three phase lines of low-pressure side among Fig. 6.All the other labels in the Figure 4 and 5 are corresponding consistent with Fig. 1 and 2.
Claims (1)
1. a demarcation load switch comprises Switch main body and intelligence controlling device, and Switch main body is electrically connected with intelligence controlling device; Switch main body comprises housing, insulated tension pole, vacuum interrupter, voltage transformer, A phase current mutual inductor, B phase current mutual inductor, C phase current mutual inductor and spring operating mechanism, and A phase current mutual inductor, B phase current mutual inductor, C phase current mutual inductor are provided with the shared low-pressure side neutral line; Intelligence controlling device comprises housing and the control device of being located in the housing; It is characterized in that, be provided with ZCT in the housing of intelligence controlling device, ZCT is located on the said neutral line, neutral earthing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120297761XU CN202172054U (en) | 2011-08-16 | 2011-08-16 | A demarcation load switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120297761XU CN202172054U (en) | 2011-08-16 | 2011-08-16 | A demarcation load switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202172054U true CN202172054U (en) | 2012-03-21 |
Family
ID=45830244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120297761XU Expired - Fee Related CN202172054U (en) | 2011-08-16 | 2011-08-16 | A demarcation load switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202172054U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102280325A (en) * | 2011-08-16 | 2011-12-14 | 厦门启和电器有限公司 | Boundary load switch |
-
2011
- 2011-08-16 CN CN201120297761XU patent/CN202172054U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102280325A (en) * | 2011-08-16 | 2011-12-14 | 厦门启和电器有限公司 | Boundary load switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120321 Termination date: 20150816 |
|
| EXPY | Termination of patent right or utility model |