CN204204779U - With the residual current circuit breaker of over-voltage protecting function - Google Patents
With the residual current circuit breaker of over-voltage protecting function Download PDFInfo
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- CN204204779U CN204204779U CN201420685056.0U CN201420685056U CN204204779U CN 204204779 U CN204204779 U CN 204204779U CN 201420685056 U CN201420685056 U CN 201420685056U CN 204204779 U CN204204779 U CN 204204779U
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- disconnect
- circuit breaker
- electromagnetic relay
- residual current
- current circuit
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Abstract
The utility model discloses the residual current circuit breaker of band over-voltage protecting function, comprise disconnect and electric leakage/overvoltage protection part, electric leakage/overpressure protection divides and comprises overvoltage protective module, zero sequence current mutual inductor, electromagnetic relay, dropout link gear, earth leakage protective circuits for triggering; Overvoltage protective module comprises the piezoresistive wafer and PTC thermistor sheet that are positioned at encapsulated layer, an electrode of piezoresistive wafer and an electrode seal of thermosensitive resistor film link together, the another side electrode of piezoresistive wafer and the another side electrode of thermosensitive resistor film welding lead respectively, forms exit; During electromagnetic relay energising adhesive, promote dropout link gear and disconnect is disconnected; Earth leakage protective circuits for triggering are connected with electromagnetic relay and zero sequence current mutual inductor respectively; Two exits of overvoltage protective module are connected in parallel on the load end of disconnect.The utility model has over-voltage protection function, and safety and reliability is much higher than the residual current circuit breaker of prior art.
Description
Technical field
The utility model relates to residual current circuit breaker, particularly a kind of residual current circuit breaker with over-voltage protecting function.
Background technology
Residual current circuit breaker (or steelyard slepsydra electric switch) is the low-voltage distribution device for switching generally adopted, for the protection of personal safety.
Due to reasons such as power supply network fault, equipment switching, misphase, circuit resonance, often can cause supply line that power-frequency overvoltage fault occurs, power-frequency overvoltage can make power consumption equipment overload even burn.
General residual current circuit breaker does not have over-voltage protection function, existing several public technology realizes over-voltage protection function in residual current circuit breaker, but all existing defects and not enough: such as adopt piezo-resistance to connect separately or again method (the utility model patent 200520075916.x of 1 current-limiting resistance; 200520075915.5 etc.), when input power circuit generation overvoltage reaches the puncture voltage of piezo-resistance, piezo-resistance resistance reduces, electric current is had to flow through, this electric current makes zero sequence current mutual inductor secondary side produce voltage signal, start electronic switch (controllable silicon or other switching circuits) and make the actuating of relay, pull switch action.But there is very large defect in this technology, due to the uncertainty of power-frequency overvoltage, piezo-resistance has strong nonlinearity characteristic, when higher overvoltage, piezo-resistance and the current-limiting resistance of connecting with it are easy to be damaged by instantaneous overcurrent, adopt this technology to make residual current circuit breaker there is the potential safety hazard of combustion explosion on the contrary.Such as (the utility model patent 200820143599.4 of technology disclosed in other again; Utility model patent 201220380324.9, etc.), adopt electronic circuit to carry out check processing to power input voltage, start tripping mechanism when judging that supply voltage is abnormal and cut off current supply circuit.This technology not only complex structure, product cost is high, and the electronic circuit increased inherently very easily is subject to overvoltage and destroys, and therefore the Reliability of Residual Circuit Breaker of this fabrication techniques is not high.
Utility model content
In order to overcome the above-mentioned shortcoming of prior art with not enough; the purpose of this utility model is to provide a kind of residual current circuit breaker with over-voltage protecting function; not only have creepage protection function, and have over-voltage protection function, its safety and reliability is much higher than the residual current circuit breaker of prior art.
The purpose of this utility model is achieved through the following technical solutions:
With the residual current circuit breaker of over-voltage protecting function, comprise disconnect and electric leakage/overvoltage protection part, described disconnect can, for having the disconnect of overload and short-circuit protection function, also can be the disconnect without overload and short-circuit protection function; Described electric leakage/overpressure protection divides and comprises overvoltage protective module, zero sequence current mutual inductor, electromagnetic relay, dropout link gear, earth leakage protective circuits for triggering;
Described overvoltage protective module comprises the piezoresistive wafer and PTC thermistor sheet that are positioned at encapsulated layer, an electrode of described piezoresistive wafer and an electrode seal of PTC thermistor sheet link together, the another side electrode of described piezoresistive wafer and the another side electrode of described PTC thermistor sheet welding lead respectively, forms two exits;
Described dropout link gear is mechanically connected with electromagnetic relay, disconnect respectively;
Described dropout link gear is worked by the adhesive action of electromagnetic relay, when electromagnetic relay energising adhesive, promotes mechanical release device and disconnect is disconnected;
Two exits of described overvoltage protective module are connected in parallel on the load end (one end connects phase line, and one end connects zero line) of disconnect, and make its current path through zero sequence current mutual inductor.
The coil rating operating voltage of described electromagnetic relay is power supply phase voltage.
Described earth leakage protective circuits for triggering are connected with electromagnetic relay coil and zero sequence current mutual inductor output (secondary side), when zero sequence current mutual inductor primary side current non-vanishing (having residual current), be connected to the controllable silicon SCR conducting of bridge-type rectification output end in earth leakage protective circuits for triggering, thus make the electromagnetic relay being connected on bridge rectifier input obtain electric adhesive, promote mechanical release device and disconnect is disconnected;
The overvoltage protective module formed by adopting piezoresistive wafer and PTC thermistor sheet to be close to thermal coupling of the present utility model; when supply voltage exceedes the pressure sensitive voltage of piezo-resistance; overvoltage protective module of the present utility model has electric current to flow through; cause zero sequence current mutual inductor primary side current non-vanishing (having residual current); thus make the action of dropout link gear; to cut off the electricity supply loop, do not destroyed by overvoltage to protect load.
The utility model can make the residual current circuit breaker of single-phase zone over-voltage protecting function; also the residual current circuit breaker of three facies tract over-voltage protecting functions can be made; in the residual current circuit breaker of single-phase zone over-voltage protecting function; described overvoltage protective module number is one; in the residual current circuit breaker of three facies tract over-voltage protecting functions, described overvoltage protective module number is three.
Compared with prior art, the utility model has the following advantages and beneficial effect: the residual current circuit breaker of band over-voltage protecting function of the present utility model, overvoltage protective module is close to thermal coupling by piezoresistive wafer and PTC thermistor sheet and is formed, when supply voltage excessive (during much larger than the pressure sensitive voltage of piezo-resistance), piezoresistive wafer and PTC thermistor sheet all can have larger current to flow through, two element heating can make PTC thermistor sheet reach its Curie point, after PTC thermistor sheet temperature exceedes Curie point, resistance value raises rapidly, avoid that piezoresistive wafer is overheated to be burnt.Adopt prior art; when supply voltage excessive (during much larger than the pressure sensitive voltage of piezo-resistance); piezoresistive wafer has larger current to flow through; piezo-resistance may lose heat balance and explosive combustion owing to bearing macro-energy; particularly when electromagnetic relay coil damages; or during the inefficacy of earth leakage protective circuits for triggering, dropout link gear can not make switch disconnect, and piezo-resistance is easier in high voltage overload combustion explosion.And use overvoltage protective module of the present utility model, even if dropout link gear lost efficacy, overvoltage protective module of the present utility model also can bear high voltage for a long time and not be destroyed, thus avoids combustion completion accident of blasting.
Accompanying drawing explanation
Fig. 1 is the circuit connection diagram of the residual current circuit breaker (single-phase) of the band over-voltage protecting function of embodiment of the present utility model.
Fig. 2 is the schematic diagram of the overvoltage protective module of embodiment of the present utility model.
Fig. 3 is the circuit connection diagram of the residual current circuit breaker (three-phase) of the band over-voltage protecting function of embodiment of the present utility model.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
Embodiment 1
As shown in Figure 1, the residual current circuit breaker of the band over-voltage protecting function of the present embodiment, comprise disconnect and electric leakage/overvoltage protection part, described disconnect is the general disconnect 8 (in figure, L/N is power end, and L1/N is load end) with overload and short-circuit protection function; Described electric leakage/overpressure protection divides and comprises overvoltage protective module 1, zero sequence current mutual inductor 2, electromagnetic relay 3, earth leakage protective circuits for triggering 4, de-mouth link gear 5; Also comprise test resistance 6 and test button 7.
Described dropout link gear is worked by the adhesive action of electromagnetic relay, when electromagnetic relay energising adhesive, promotes mechanical release device and disconnect is disconnected.
As shown in Figure 1, the two ends of described overvoltage protective module are connected in parallel on the load end of disconnect (L1/N), and make its current path through zero sequence current mutual inductor.
Described test resistance and test button are in parallel with overvoltage protective module after connecting; Whether the residual current circuit breaker that test resistance and test button are used for test tape over-voltage protecting function can normally work.
Described earth leakage protective circuits for triggering are connected with electromagnetic relay coil and zero sequence current mutual inductor output (secondary side).
As shown in Figure 2; the overvoltage protective module of the present embodiment comprises the piezoresistive wafer 11 and PTC thermistor sheet 12 that are positioned at encapsulated layer; an electrode of described piezoresistive wafer 11 and an electrode seal of PTC thermistor sheet 12 link together, and the another side electrode of described piezoresistive wafer and the another side electrode of described PTC thermistor sheet be welding lead 13 and lead-in wire 14 respectively.
As shown in Figure 1, the earth leakage protective circuits for triggering of the present embodiment comprise the bridge rectifier be made up of four diode D1 ~ D4 (1N4007), be connected to the controllable silicon of bridge rectifier output, and by capacitor C1, resistor R1 and R2, the thyristor gating circuit that voltage stabilizing didoe VD1 forms, when zero sequence current mutual inductor primary side current non-vanishing (having residual current), zero sequence current mutual inductor output (secondary side) generation current makes resistor R2 two ends produce voltage, this voltage filters out after half-wave through VD1 and charges to capacitor C1 through resistance R1, SCR conducting is made after C1 charging reaches controllable silicon SCR gate trigger voltage, thus make the electromagnetic relay being connected on bridge rectifier input obtain electric adhesive, promoting mechanical release device makes disconnect disconnect.
The present embodiment selects diameter/thickness to be about 10.0/1.9mm, pressure sensitive voltage V
1mAthe piezoresistive wafer of=315V ± 5%; Select diameter/thickness to be about 4.5/3.0mm, room temperature (25 DEG C) resistance 200 ~ 300 ohm, Curie temperature is the PTC thermistor sheet of 115 DEG C, makes overvoltage protective module by above-mentioned execution mode.
Protective value test is carried out to the residual current circuit breaker of the band over-voltage protecting function of the present embodiment:
1) overvoltage protection test: the single-phase zone overvoltage protection residual current circuit breaker made by the present embodiment connects variable voltage source, when initial condition is for closing a floodgate, when voltage source power supply is lower than 265VAC, the present embodiment band overvoltage protection residual current circuit breaker is failure to actuate; When voltage source voltage be adjusted to be greater than 295VAC time, the present embodiment band overvoltage protection residual current circuit breaker tripping operation realize protection; When voltage source voltage is adjusted to 265 ~ 295VAC scope; the band overvoltage protection residual current circuit breaker of the present embodiment is by according to the varistor pressure sensitive voltage parameter actions adopted when making overvoltage protective module; minimum voltage action 265VAC, the highest voltage 295VAC that is failure to actuate.This scope regulates by changing piezo-resistance parameter in aforementioned overvoltage protective module.
The single-phase zone overvoltage protection residual current circuit breaker made by the present embodiment connects variable voltage source, and when initial condition is off, when voltage source power supply is lower than 265VAC, by breaker closing, the band overvoltage protection residual current circuit breaker of the present embodiment is failure to actuate; When voltage source voltage be adjusted to be greater than 295VAC time; the band overvoltage protection residual current circuit breaker of the present embodiment can not be closed a floodgate (protection of combined floodgate immediate trip); when voltage source voltage is adjusted to 265 ~ 295VAC scope; the band overvoltage protection residual current circuit breaker of the present embodiment is by according to the varistor pressure sensitive voltage parameter actions adopted when making overvoltage protective module; minimum can not switching voltage 265VAC, the highest can switching voltage 295VAC.This scope regulates by changing piezo-resistance parameter in aforementioned overvoltage protective module.
2) voltage test is exceeded especially: when initial condition is that supply voltage is lower than 265VAC; and band overvoltage protection residual current circuit breaker of the present utility model is in "on" position; voltage source output voltage is adjusted to 450VAC; the band overvoltage protection residual current circuit breaker immediate trip of the present embodiment is to protect load; repetition test 50 times; the product of the present embodiment can both identify high voltage and trip in time, power supply and load is disconnected.When initial condition is that the utility model band overvoltage protection residual current circuit breaker is in open-circuit condition; supply voltage is adjusted to 450VAC, now the utility model product is closed a floodgate, close a floodgate and namely produce protection act instantaneously; repetition test all can not be closed a floodgate, and avoids load to be destroyed by power supply high voltage.
3) safety testing when tripping mechanism lost efficacy: inner for the band overvoltage protection residual current circuit breaker of the present embodiment electromagnetic relay coil is disconnected; voltage source output voltage is adjusted to 450VAC; residual current circuit breaker is closed a floodgate and continues 1 hour; although the residual current circuit breaker of the present embodiment is failure to actuate, the overvoltage protective module in the present embodiment product does not burn because of overvoltage.Contrast test adopts prior art; according to the circuit connecting mode of similar utility model patent 200520075916.x; piezo-resistance is adopted to connect with a fixed resistor (300 ohm) overvoltage protective module replaced in Fig. 1; disconnect relay coil; when supply voltage is adjusted to 450VAC, this comparative sample inner pressure sensitive resistor detonation.
Embodiment 2
As shown in Figure 3, the residual current circuit breaker of the band over-voltage protecting function of the present embodiment, comprise disconnect part and electric leakage/overvoltage protection part, described disconnect is the disconnect 8 (A, B in figure, C, three phase lines for power end, U, V, W are three phase lines of load end) that general three-phase has overload and short-circuit protection function; Described electric leakage/overpressure protection divides and comprises three overvoltage protective modules 1, zero sequence current mutual inductor 2, electromagnetic relay 3, earth leakage protective circuits for triggering 4, dropout link gear 5; Also comprise test resistance 6 and test button 7.
Described overvoltage protective module comprises the piezoresistive wafer and PTC thermistor sheet that are positioned at encapsulated layer; an electrode of described piezoresistive wafer and an electrode seal of PTC thermistor sheet link together; the another side electrode of described piezoresistive wafer and the another side electrode of described PTC thermistor sheet welding lead respectively, forms two exits.
Described dropout link gear is worked by the adhesive action of electromagnetic relay, when electromagnetic relay energising adhesive, promotes mechanical release device and disconnect is disconnected.
One end of described three overvoltage protective modules connects three phase lines (U, V, W) of disconnect load end respectively, and the other end all connects zero line N, and makes its current path all pass zero sequence current mutual inductor.
Described test resistance and test button are in parallel with in three overvoltage protective modules after connecting; Whether the residual current circuit breaker that test resistance and test button are used for test tape over-voltage protecting function can normally work.
Described dropout link gear is worked by the adhesive action of electromagnetic relay, when electromagnetic relay energising adhesive, promotes mechanical release device and disconnect is disconnected;
Described earth leakage protective circuits for triggering are connected with electromagnetic relay coil and zero sequence current mutual inductor output (secondary side).
Described earth leakage protective circuits for triggering are identical with embodiment 1.
Test result: in three-phase, any phase voltage overvoltage all can make the band overvoltage protection residual current circuit breaker action of the present embodiment.The safety testing result exceeded especially when voltage test lost efficacy with tripping mechanism is identical with embodiment 1.
Above-described embodiment is the utility model preferably execution mode; but execution mode of the present utility model is not limited by the examples; change, the modification done under other any does not deviate from Spirit Essence of the present utility model and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection range of the present utility model.
Claims (3)
1. be with the residual current circuit breaker of over-voltage protecting function, comprise disconnect and electric leakage/overvoltage protection part, it is characterized in that, described electric leakage/overpressure protection divides and comprises overvoltage protective module, zero sequence current mutual inductor, electromagnetic relay, dropout link gear and earth leakage protective circuits for triggering;
Described overvoltage protective module comprises the piezoresistive wafer and PTC thermistor sheet that are positioned at encapsulated layer, an electrode of described piezoresistive wafer and an electrode seal of PTC thermistor sheet link together, the another side electrode of described piezoresistive wafer and the another side electrode of described PTC thermistor sheet welding lead respectively, forms two exits;
Described dropout link gear is mechanically connected with electromagnetic relay, disconnect respectively;
Described dropout link gear is worked by the adhesive action of electromagnetic relay, when electromagnetic relay energising adhesive, promotes mechanical release device and disconnect is disconnected;
Described earth leakage protective circuits for triggering are connected with the coil of electromagnetic relay and the output of zero sequence current mutual inductor respectively;
On the phase line that two exits of described overvoltage protective module are connected in parallel on the load end of disconnect and zero line, and make its current path through zero sequence current mutual inductor.
2. the residual current circuit breaker of band over-voltage protecting function according to claim 1, is characterized in that, when disconnect is single phase power switch, described overvoltage protective module number is one.
3. the residual current circuit breaker of band over-voltage protecting function according to claim 1, is characterized in that, when disconnect is three-phase power switch, described overvoltage protective module number is three.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420685056.0U CN204204779U (en) | 2014-11-14 | 2014-11-14 | With the residual current circuit breaker of over-voltage protecting function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420685056.0U CN204204779U (en) | 2014-11-14 | 2014-11-14 | With the residual current circuit breaker of over-voltage protecting function |
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| CN204204779U true CN204204779U (en) | 2015-03-11 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104392871A (en) * | 2014-11-14 | 2015-03-04 | 华南理工大学 | Residual-current circuit breaker with overvoltage protection function |
| CN106026017A (en) * | 2016-07-07 | 2016-10-12 | 华南理工大学 | Leakage breaker with over-voltage protection and under-voltage protection |
| CN106953298A (en) * | 2017-03-22 | 2017-07-14 | 无锡飞翎电子有限公司 | Washing machine and its overvoltage crowbar |
| TWI632580B (en) * | 2017-04-18 | 2018-08-11 | 徐政村 | Power switch module |
-
2014
- 2014-11-14 CN CN201420685056.0U patent/CN204204779U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104392871A (en) * | 2014-11-14 | 2015-03-04 | 华南理工大学 | Residual-current circuit breaker with overvoltage protection function |
| CN106026017A (en) * | 2016-07-07 | 2016-10-12 | 华南理工大学 | Leakage breaker with over-voltage protection and under-voltage protection |
| CN106026017B (en) * | 2016-07-07 | 2019-01-18 | 华南理工大学 | A kind of leakage circuit breakers with overvoltage protection and low-voltage protection |
| CN106953298A (en) * | 2017-03-22 | 2017-07-14 | 无锡飞翎电子有限公司 | Washing machine and its overvoltage crowbar |
| CN106953298B (en) * | 2017-03-22 | 2019-07-19 | 无锡飞翎电子有限公司 | Washing machine and its overvoltage crowbar |
| TWI632580B (en) * | 2017-04-18 | 2018-08-11 | 徐政村 | Power switch module |
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