CN206099289U - Four -pole circuit breaker - Google Patents
Four -pole circuit breaker Download PDFInfo
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- CN206099289U CN206099289U CN201620933173.3U CN201620933173U CN206099289U CN 206099289 U CN206099289 U CN 206099289U CN 201620933173 U CN201620933173 U CN 201620933173U CN 206099289 U CN206099289 U CN 206099289U
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- phase line
- neutral conductor
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- neutral
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Abstract
The utility model relates to a low voltage distribution system's a four -pole circuit breaker, main including the first phase line, second phase line and the third phase line that set up side by side each other, along the direction of current flow, it sets up release and phase line current detection component to establish ties in proper order on first phase line, second phase line and third phase line respectively, the neutral conductor with first phase line, second phase line and third phase line set up side by side, along the direction of current flow set up neutral conductor current detection component on the neutral conductor, the current setting of the neutral conductor is 0.5 times or 1 times or 2 times of phase line current setting, overflows or during the short circuit when the neutral conductor, and the release on three looks lines should be disconnected with the time. The function of its existing four -pole circuit breaker neutral conductor protection has constantly zero advantage of three -pole breaker again.
Description
Technical field
This utility model is related to low-voltage distribution system, and especially the protection device of low-voltage distributing line is designed.
Background technology
Low-voltage circuit breaker is the protection device commonly used in low-voltage distribution system.As the diversification of electrical equipment is produced and low
The development of press-fitting electric system form, in 380/220V three-phase four-wire low-voltage distribution systems, it is considered to which three phase unbalance current is negative
The impact of triple-frequency harmonics in load, the application of four-pole circuit breaker are also more and more, but some systems do not allow to disconnect the neutral conductor or load
There is phenomenon off zero during heart system operation, generally using three-pole breaker.In order to consider that centrage is protected, avoid again breaking
The generation of zero phenomenon, also has and adds neutral conductor transformer to meet use demand using three-pole breaker.
Utility model content
The utility model proposes a kind of four-pole circuit breaker of neutral conductor not disjunction, existing four-pole circuit breaker neutral conductor protection
Function, has the advantages that three-pole breaker is not off zero again.
The technical solution of the utility model is：A kind of four-pole circuit breaker, main the first phase line for including being mutually juxtaposed setting,
Second phase line and third phase line, along the sense of current, are sequentially connected in series setting respectively on the first phase line, the second phase line and third phase line
Electrical apparatus release and phase line current detecting element；The neutral conductor is set up in parallel with first phase line, the second phase line and third phase line, along electricity
Stream direction, arranges neutral current detecting element on the neutral conductor；The current setting of the neutral conductor is phase line current
0.5 times of setting valve or 1 times or 2 times, when neutral conductor excessively stream or short circuit, the electrical apparatus release in three phase lines should disjunction simultaneously.
This utility model core content is to be provided with current measuring element on its neutral conductor, without arranging electrical apparatus release.Its
The protection that the neutral conductor is provided with, can be set by three kinds of situations such as 0.5 times, 1 times or 2 times that current setting is phase line current setting valve
Put.When neutral conductor excessively stream or short circuit, the electrical apparatus release in three phase lines answers disjunction, and the neutral conductor is continuous.
This utility model cancels the electrical apparatus release for disjunction on the neutral conductor on traditional four-pole circuit breaker, keeps quadrupole disconnected
Road device other functions are constant.
The multiple systems forms such as this utility model TT, TN-C-S, TN-S suitable for current low-voltage distribution system, application
Future widely, where the disjunction neutral conductor is clearly required, can install by other positions.
In theory, in the power system of preferable three-phase equilibrium, the neutral conductor does not carry electric current, but in three-phase imbalance and
When the power factor (PF) of each phase load is inconsistent, can there is certain electric current in the neutral conductor, or even its electric current is likely larger than phase line electricity
Stream.Secondly, in practical application, the presence of triple-frequency harmonics in load is even more and substantially increases the electric current that the neutral conductor flows through.Thus,
Need to set overcurrent protection in many occasion neutral conductors.Again, the neutral conductor has the work(for reducing load-side neutral potential offset
Energy.In the event of broken neutral line accident, be commonly called as " off zero ", then will cause the mutation of single-phase voltage, i.e., become 0 from 220 volts～
380 volts.Single-phase overvoltage can cause a large amount of electrical appliance overvoltages to burn out, and under-voltage the RCD related to voltage can be caused to fail.
So, the contact of the neutral conductor must be good, and connection must be reliable.
Application of the present utility model will improve the defencive function of switch, reduce failure risk.Meanwhile, also to electrical design teacher
There is provided new selection, that is, facilitate and reliable.
Description of the drawings
Fig. 1 is schematic diagram of the present utility model.
Specific embodiment
As shown in figure 1, four-pole circuit breaker, main the first phase line L1 for including being mutually juxtaposed setting, the second phase line L2 and the
Triple line L3, along the sense of current, on the first phase line L1, the second phase line L2 and third phase line L3 is sequentially connected in series setting respectively and threads off
Device 1 and phase line current detecting element 2；Neutral conductor N is set up in parallel with the first phase line L1, the second phase line L2 and third phase line L3, edge
The sense of current, arranges neutral current detecting element 3 on neutral conductor N, and the current setting of the neutral conductor N is phase line current
0.5 times of setting valve or 1 times or 2 times, the i.e. current setting of neutral current detecting element 3 are phase line current detecting element 2
0.5 times, 1 times or 2 times of current setting；When neutral conductor excessively stream or short circuit, the electrical apparatus release 1 in three phase lines should the same time-division
It is disconnected.
In four line distribution system of low voltage three-phase, this utility model can determine neutral current detecting element by following principle
3 current setting：
1st, when Estimation System three phase unbalance current is less, neutral current is typically not over 1/2 phase line current.It is disconnected
Road device selects have overload and short-circuit protection for three phase pole L, and neutral pole N is with 0.5 times of overcurrent protection.I.e.：Work as neutrality
When line current exceedes the 50% of phase line overcurrent action setting valve, neutral pole overcurrent protection action causes chopper phase pole to be threaded off
Device trips.Neutral conductor N sections can be the 1/2 of phase line L section.
2nd, when system three phase unbalance current is larger or has triple-frequency harmonics（Less than 33%）, neutral current typically will not
More than phase line current.Chopper selects have overload and short-circuit protection for three phase pole L, and neutral pole N is with 1 times of over current protection
Shield.I.e.：When neutral current exceedes the 100% of phase line overcurrent action setting valve, neutral pole overcurrent protection action is caused
The electrical apparatus release tripping operation of chopper phase pole.Neutral conductor N can wait in section isopen L sections.
3rd, when system has three times of higher composition and three multiple harmonic waves（More than 33%）, neutral conductor N will carry higher humorous
Ripple electric current, neutral current can typically exceed phase line current, should now strengthen neutral conductor overcurrent protection measure and be protected.It is disconnected
Road device selects have overload and short-circuit protection for three phase pole L, and neutral pole N has 2 times of overcurrent protection, i.e.,：Work as the neutral conductor
When electric current exceedes the 200% of phase line overcurrent action setting valve, neutral pole overcurrent protection action causes chopper phase line to be threaded off
Device trips.Neutral conductor N sections can be the multiple in phase line L section.
Above the scheme provided by this utility model enforcement example is discussed in detail, for the general technology people of this area
Member, according to the thought of this utility model embodiment, will change in specific embodiments and applications.To sum up institute
State, this specification content is should not be construed as to restriction of the present utility model, it is all according to this utility model design philosophy done it is any
Change all within protection domain of the present utility model.
Claims (1)
1. a kind of four-pole circuit breaker, main including the first phase line for being mutually juxtaposed setting（L1）, the second phase line（L2）And third phase
Line（L3）, along the sense of current, respectively in first phase line（L1）, second phase line（L2）With the third phase line（L3）On
It is sequentially connected in series setting electrical apparatus release（1）With phase line current detecting element（2）, it is characterised in that：The neutral conductor（N）With first phase line
（L1）, second phase line（L2）With the third phase line（L3）It is set up in parallel, along the sense of current, in the neutral conductor（N）On
Neutral current detecting element is set（3）；The neutral conductor（N）Current setting be 0.5 times or 1 of phase line current setting valve
Times or 2 times, when the neutral conductor excessively stream or short circuit when, the electrical apparatus release in three phase lines（1）Should disjunction simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620933173.3U CN206099289U (en) | 2016-08-25 | 2016-08-25 | Four -pole circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620933173.3U CN206099289U (en) | 2016-08-25 | 2016-08-25 | Four -pole circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206099289U true CN206099289U (en) | 2017-04-12 |
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ID=58468847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620933173.3U Active CN206099289U (en) | 2016-08-25 | 2016-08-25 | Four -pole circuit breaker |
Country Status (1)
| Country | Link |
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| CN (1) | CN206099289U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451332A (en) * | 2016-08-25 | 2017-02-22 | 华东建筑设计研究院有限公司 | Quadrupole circuit breaker |
-
2016
- 2016-08-25 CN CN201620933173.3U patent/CN206099289U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451332A (en) * | 2016-08-25 | 2017-02-22 | 华东建筑设计研究院有限公司 | Quadrupole circuit breaker |
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