CN201946946U - Novel neutral line disconnection protection module of low-voltage circuit breaker - Google Patents
Novel neutral line disconnection protection module of low-voltage circuit breaker Download PDFInfo
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- CN201946946U CN201946946U CN2010205537354U CN201020553735U CN201946946U CN 201946946 U CN201946946 U CN 201946946U CN 2010205537354 U CN2010205537354 U CN 2010205537354U CN 201020553735 U CN201020553735 U CN 201020553735U CN 201946946 U CN201946946 U CN 201946946U
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- circuit breaker
- neutral line
- protection
- protection module
- voltage
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Abstract
The utility model relates to a novel neutral line disconnection protection module of a low-voltage circuit breaker, which consists of a piezoresistor or other pressure sensitive elements with voltage limiting property, and is combined in the circuit breaker or independently encapsulated, and linked in parallel with a neutral line and a protective grounding line at a load side of a current protection element. The novel neutral line disconnection protection module is matched with leakage protection or short circuit protection in the circuit breaker for use, and has the functions of preventing faults of overvoltage and further damage to an electric appliance when the neutral line is disconnected, and preventing other faults of overvoltage caused by potential drift of the neutral line for protection.
Description
Technical field
The utility model relates to a kind of low-voltage circuit breaker overvoltage protective module.This module can be installed in the inside or the outside of circuit breaker, is used for the TN-S system.This module can be clamped down on neutral line current potential in safe range, and cooperates with leakage protection module or short-circuit protection module circuit breaker is tripped when neutral line voltage floats to dangerous values.This module is mainly used in takes precautions against the fault that broken neutral line causes electrical equipment to burn, and other faults that cause the drift of neutral line current potential are also had the protection preventive effect.
Background technology
At present, overvoltage protection all is pilot wire voltage or phase voltage in the known circuit breaker, and specific implementation mainly contains two kinds:
1) with the direct detection system voltage of coil.When the generation systems overtension, detect the coil drive armature of voltage, make circuit breaker tripping.This over-voltage protection module cost is lower, but precision is not high;
2) with electronic circuit monitoring system voltage.When overvoltage took place, electronic circuit sent drive signal, acts on tripping coil, makes circuit breaker tripping.This over-voltage protection module precision is higher, but cost is also higher.
Simultaneously, more than the test section of two kinds of modules when operate as normal, all the line voltage or the phase voltage of application system, the failure rate of module is higher.
For above-mentioned reasons, civilian low-voltage circuit breaker major part only is provided with current protection module (short circuit and overload protection module, leakage protection module), does not have over-voltage protection module.When system voltage was too high, element broke down, and caused electric current and raise, and the short circuit of circuit breaker or overload protection module start, circuit breaker trip.But during tripping operation, electrical equipment often damages.Just often, only tripping operation when electrical apparatus insulation breaks down of leakage protection module does not have direct protective effect to overvoltage.
In addition, also exist between the phase line in the practice or the direct Surge Protector overvoltage protection scheme that inserts between the phase line and the neutral line.Limited by the material discreteness, the protection value is much in 1.5 times of rated voltage peak values.Surge Protector is primarily aimed at lightning protected and switching overvoltage, the unshielded effect of overvoltage that broken neutral line or drift are caused.Simultaneously, Surge Protector bears voltage for a long time in this scheme, and self easily breaks down and influences normal electricity consumption.
Summary of the invention
For solving the deficiency that existing overvoltage protective module exists in the low-voltage circuit breaker, the utility model provides a kind of novel over-voltage protection module.By inquiry, in civilian electricity consumption, be owing to behind the broken neutral line to the superpotential of household electrical appliance infringement maximum, the neutral line potential drifting that causes.The present invention is primarily aimed at the overvoltage that neutral broken string causes, the overvoltage that causes for other neutral line current potential drifts shields equally.
Over-voltage protection module of the present utility model has been avoided just often bearing than high working voltage, reduces faults itself and takes place; Can when neutral point drifting arrives dangerous values, make circuit breaker tripping reliably by selecting lower clamp voltage parameter simultaneously.
The technical solution of the utility model is: the broken neutral line protection module of New Type of Low Voltage Circuit Breaker is made up of piezo-resistance or other pressure cell with pressure limiting characteristic; be combined to circuit breaker inside or individual packages, the neutral line of connect in parallel current protection element load side and protection ground wire.
Operation principle of the present utility model is: when broken neutral line took place, the drift of pressure cell restriction neutral line voltage produced bigger fault current simultaneously, makes the current protection element start cut-off breaker.The utility model requires supporting circuit breaker to have the current protection module, has a kind of in leakage protection module or the short-circuit protection module at least.This programme is recommended supporting circuit breaker with creepage protection function, can make protection sensitive like this, effectively protects electrical appliance.It is that the circuit breaker that fracture is set is arranged on the N line that the utility model is recommended supporting circuit breaker.Though can not cut off the electricity supply with the circuit breaker of fracture for the N line, play a protective role, fault can not be isolated fully, will not recommend.The present invention recommends to be used for single phase system, also can use for three-phase system.Protection range of the present utility model is the broken neutral line that the installation site mains side takes place.When the utility model is combined to circuit breaker inside, to increase the joint Terminal of protection ground wire PE on the circuit breaker.
The beneficial effects of the utility model are effectively to have taken precautions against the abominable injury to electrical equipment that broken neutral line causes under the prerequisite that does not increase a lot of costs; The utility model is simple in structure; It is very low that protection module just often bears voltage in system, reduced the application risk, prolonged useful life.
Description of drawings
Below in conjunction with accompanying drawing and example the utility model is further specified.Symbol in the drawing " L1 ", " L2 " " L3 " are the signs of three phase lines of mains side in the three-phase circuit; " A ", " B " " C " are the signs of three phase lines of load side in the three-phase circuit; " L " is the sign of phase line in the single phase circuit; " N " is the sign of the neutral line, and " PE " is the sign of protection ground wire.
Fig. 1 is a three-phase circuit schematic diagram of the present utility model.1. element is the breaker contact point of band arc extinguishing function in the circuit breaker; 2. element is automatic trip actuator in the circuit breaker; 3. element is short circuit and overcurrent protection module, general complete in circuit breaker; 4. element is leakage protection module, general complete in circuit breaker; 5. element is the broken neutral line protection module, mainly is made up of pressure cell.Wherein 4. 3. element possess a kind of with element at least.
Fig. 2 is a single phase circuit schematic diagram of the present utility model.Element illustrates same Fig. 1.
Fig. 3 is the structural representation that the utility model is packaged into an individual devices in three-phase circuit.1. element is circuit breaker, and wherein Shi Yi short circuit/overcurrent protection module and leakage protection module possess a kind of in circuit breaker at least; 2. element is the broken neutral line protection module, mainly is made up of piezo-resistance.
Fig. 4 is the structural representation that the utility model is packaged into an individual devices in single phase circuit.Element illustrates same Fig. 3.
Fig. 5 is that the utility model feed into breaker structure schematic diagram behind the three-phase breaker.The short circuit of illustrating among the figure/overcurrent protection module and leakage protection module possess a kind of in circuit breaker at least.
Fig. 6 is that the utility model feed into breaker structure schematic diagram behind the single-phase circuit breaker.
Embodiment
1, the selection of parameter.This overvoltage protective module mainly is made up of pressure cell.Pressure cell is selected main 3 parameters of considering:
1) voltage limiting value: this parameters relationship protection effect.Recommendation is chosen as AC value 30V; Perhaps bidirectional DC voltage 42V;
2) conducting electric current: the reliability of this parameters relationship protection module under failure condition.If have leakage protection module in the circuit breaker, general piezo-resistance conducting electric current can satisfy, otherwise recommends this value 1.2 times for the circuit breaker short circuit protective current;
3) leakage current: the reliability of this parameters relationship during to normal operation circuit.Recommend this value less than 30% of circuit breaker leakage current protection element startup value.
2, version.Pressure cell is combined in the circuit breaker, or is packaged into a module separately:
1) is packaged into a device separately: see accompanying drawing 3 and accompanying drawing 4.The position of place in circuit is the circuit breaker load side.
2) be combined in the circuit breaker: see accompanying drawing 5 and accompanying drawing 6.At this moment, a protection ground wire to be set especially in the circuit breaker and connect terminal.
Claims (2)
1. the broken neutral line protection module of a novel low-voltage circuit breaker is made up of piezo-resistance or other pressure cell with pressure limiting characteristic, is combined to circuit breaker inside or individual packages, the neutral line of connect in parallel current protection element load side and protection ground wire.
2. the broken neutral line protection module of novel low-voltage circuit breaker according to claim 1 is characterized in that: when this module combinations is inner to circuit breaker, will increase the joint Terminal of protection ground wire PE on the circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205537354U CN201946946U (en) | 2010-10-09 | 2010-10-09 | Novel neutral line disconnection protection module of low-voltage circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205537354U CN201946946U (en) | 2010-10-09 | 2010-10-09 | Novel neutral line disconnection protection module of low-voltage circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201946946U true CN201946946U (en) | 2011-08-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205537354U Expired - Fee Related CN201946946U (en) | 2010-10-09 | 2010-10-09 | Novel neutral line disconnection protection module of low-voltage circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201946946U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257303A (en) * | 2013-05-31 | 2013-08-21 | 重庆大学 | Neutral line disconnection detection method based on third-harmonic currents |
-
2010
- 2010-10-09 CN CN2010205537354U patent/CN201946946U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257303A (en) * | 2013-05-31 | 2013-08-21 | 重庆大学 | Neutral line disconnection detection method based on third-harmonic currents |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110824 Termination date: 20131009 |