CN201904601U - Multifunctional three-phase circuit breaker - Google Patents
Multifunctional three-phase circuit breaker Download PDFInfo
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- CN201904601U CN201904601U CN2010206770939U CN201020677093U CN201904601U CN 201904601 U CN201904601 U CN 201904601U CN 2010206770939 U CN2010206770939 U CN 2010206770939U CN 201020677093 U CN201020677093 U CN 201020677093U CN 201904601 U CN201904601 U CN 201904601U
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Abstract
The utility model provides a multifunctional three-phase circuit breaker used for perfecting the protection function of a three-phase circuit breaker and guaranteeing the safe operation of electric equipment. The technical scheme of the multifunctional three-phase circuit breaker is that a housing and a thermal tripping device at the inner part of the housing are comprised; after the multifunctional three-phase circuit breaker is improved, an electronic tripping device is additionally arranged; the electronic tripping device comprises a three-phase rectifier bridge, an under-voltage open-phase detection circuit, an overvoltage detection circuit and a triggering execution circuit; an alternate current input terminal of the three-phase rectifier bridge is connected with a three-phase power source; the triggering execution circuit comprises a tripping coil and a thyristor; a negative electrode of the thyristor is connected with a negative electrode of the three-phase rectifier bridge; a positive electrode of the thyristor is connected with a positive electrode of the three-phase rectifier bridge via the tripping coil; a grid electrode of the thyristor is connected with an output terminal of the under-voltage open-phase detection circuit and an output terminal of the overvoltage detection circuit; and the tripping coil controls a tripping mechanism of the circuit breaker. The multifunctional three-phase circuit breaker has the functions of overload protection, short circuit protection, overvoltage protection, under-voltage protection and open-phase protection, and can guarantee the safe operation of the electric equipment.
Description
Technical field
The utility model relates to a kind of three-phase breaker with overvoltage, under voltage, phase failure delay protection function that is used for low-voltage distributing line, belongs to the resist technology field.
Background technology
In Industry Control, power consumption equipment uses three-phase alternating-current supply usually, and wherein a lot of power consumption equipments have higher requirement to the quality of working power.Because the variation of load, line voltage usually wave phenomenon can occur, for example starting of high power motor, and the work of electric welding machine, the start and stop of impact loads such as particularly large-scale arc furnace and heavy (merchant) mill tend to cause the big ups and downs of line voltage.If three-phase alternating-current supply is in overvoltage, under voltage, phase failure state for a long time, power consumption equipment is seriously damaged.Therefore, protective devices such as circuit breaker need be set, to guarantee the power consumption equipment safe operation in the current supply circuit of power consumption equipment.
Existing three-phase breaker generally is made of housing, operating mechanism, thermal overload release, and thermal overload release is made by bimetal leaf, and it is series in the protected circuit.When circuit overloads or short circuit, circuital current increases, and bimetal leaf Yin Wendu raises and is out of shape, and makes circuit breaker tripping.The shortcoming of this circuit breaker is not have overvoltage, under voltage, phase failure protection function, can't implement effectively protection to electrical appliance.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of multi-functional three-phase breaker that can effectively protect circuit under overvoltage, under voltage, phase failure situation is provided.
Problem of the present utility model solves with following technical proposals:
A kind of multi-functional three-phase breaker, comprise housing and inner thermal overload release thereof in the formation, after the improvement, increase an electronic trip unit, described electronic trip unit is by three-phase commutation bridge, under-voltage open-phase detection circuit, the over-voltage detection circuit button triggers executive circuit and forms, the ac input end of described three-phase commutation bridge connects three phase mains, described triggering executive circuit is made up of tripping coil and thyristor, the negative electrode of described thyristor connects the three-phase commutation bridge negative pole, anode connects the three-phase commutation bridge positive pole through tripping coil, grid connects the output of under-voltage open-phase detection circuit and over-voltage detection circuit, the tripping mechanism of described tripping coil control circuit breaker.
Above-mentioned multi-functional three-phase breaker, described under-voltage open-phase detection circuit is made up of PNP triode, first voltage-stabiliser tube, resistance and electric capacity, first resistance and second resistance are connected into the output voltage that series connection connects three-phase commutation bridge behind the bleeder circuit, the output signal of their serial connections point connects transistor base through the 3rd resistance, the 4th resistance and first voltage-stabiliser tube are concatenated into the output voltage that voltage stabilizing circuit connects three-phase commutation bridge, the voltage of first voltage-stabiliser tube output is connected to the emitter of triode, and the collector electrode of triode connects the thyristor grid via the delay circuit that the 5th resistance and first electric capacity are connected into.
Above-mentioned multi-functional three-phase breaker, described over-voltage detection circuit is made up of second voltage-stabiliser tube, the 6th resistance, variable resistor and second electric capacity, the 6th resistance and the output voltage that connects three-phase commutation bridge after variable resistor is connected into the bleeder circuit of connecting, the overvoltage signal of their serial connections point output connects the thyristor grid through second voltage-stabiliser tube, and second electric capacity is the filter capacitor of overvoltage signal.
Above-mentioned multi-functional three-phase breaker is provided with anti-interference capacitor between the grid of described thyristor and the negative electrode.
Above-mentioned multi-functional three-phase breaker, described under-voltage open-phase detection circuit and over-voltage detection circuit also and be connected to resistance capaciting absorpting circuit, described resistance capaciting absorpting circuit is in series by the 3rd electric capacity and the 7th resistance.
Above-mentioned multi-functional three-phase breaker, described electronic trip unit is installed in the attachment housings of circuit breaker one side.
The utility model utilizes thermal overload release to realize overload and short-circuit protection; utilize electronic trip unit to realize overvoltage, under voltage, open phase protection; thereby this installs existing overload and short-circuit protection function, has over-voltage protection function, under voltage protection function and phase failure protection function again.Three-phase commutation bridge also provides the information of voltage of alternating current circuit being when under-voltage open-phase detection circuit, over-voltage detection circuit button trigger the executive circuit power supply for under-voltage open-phase detection circuit, over-voltage detection circuit.Compare with traditional three-phase breaker, the utility model defencive function is complete, can guarantee the power consumption equipment safe operation.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further specified.
Fig. 1 is the outline drawing of circuit breaker.
Fig. 2 is the left view of Fig. 1.
Fig. 3 is the electric theory diagram of electronic trip unit.
Fig. 4 is the electrical schematic diagram of electronic trip unit.
Each label is among the figure: 1, housing; 2, attachment housings; 3, the handle of tripping mechanism; TQ, tripping coil; ZL, three-phase commutation bridge; Q, triode; D1, D2, voltage-stabiliser tube; D3, diode; SCR, thyristor; R1～R8, resistance; C1～C5, electric capacity.
Embodiment
The utility model mainly contains following several defencive function: overcurrent protection, short-circuit protection, overvoltage protection, under voltage protection, end of incoming cables open phase protection; three minimal type circuit breaker A, B, C three-phase breaker are installed on respectively in the housing of circuit breaker; connect as one by handle and tripping mechanism, electronic trip unit is installed in the attachment housings.Its input termination three-phase alternating-current supply voltage, output control tripping mechanism.
Referring to Fig. 4, electronic trip unit triggers executive circuit by three-phase commutation bridge ZL, under-voltage open-phase detection circuit, over-voltage detection circuit button and forms, electronic trip unit is monitored in real time to the supply voltage of power consumption equipment, when overvoltage, under-voltage, phase shortage, phenomenon occurring (overvoltage, under-voltage value can be set according to actual conditions), its inner thyristor SCR triggering and conducting, thereby allow tripping coil TQ energising adhesive, cut off the circuit breaker that electronic trip unit spliced, disconnect three phase mains.A, B, C three-phase voltage carry out rectification through three-phase commutation bridge ZL, and the dc voltage average value after the rectification is Un=2.34Ua (Ua represents the single-phase voltage value), and this voltage is that under-voltage open-phase detection circuit, over-voltage detection circuit button trigger the executive circuit power supply.R1, R2 form the bleeder circuit of under-voltage and open-phase protection, and R4, D1 are at the stable operating voltage of the emitter formation 12V of triode Q (9012), and R6, R8 form overvoltage comparison circuit.
Overvoltage condition: when line voltage greater than the under-voltage condition peak, during less than the overvoltage condition minimum value, thyristor SCR does not trigger, tripping coil TQ does not work.When line voltage exceeds the overvoltage set point, thyristor SCR triggers, after the thyristor SCR conducting, supply voltage forms the loop through rectifier bridge ZL, tripping coil TQ, thyristor SCR, tripping coil TQ is met the electric current of action, and moving circuit breaker snap close is supported in moving iron core adhesive, make circuit breaker trip, cut off the electricity supply.
Overvoltage crowbar is made up of thyristor SCR, resistance R 6, R7, R8, capacitor C 2, C3, C4, voltage-stabiliser tube D2.Wherein R7, C3 are resistance capaciting absorpting circuit, absorb surge voltage and electric current, and C2, C4 play anti-interference effect.D2 is a voltage stabilizing didoe, and triggering and conducting voltage is approximately about 12V.R6, R8 form overvoltage comparison circuit, and when the voltage of getting on the R8 during greater than the conducting voltage of D2, thyristor SCR triggering and conducting, tripping coil TQ gets electronic work.
Under-voltage protection: when line voltage was lower than under-voltage set point, this moment, protective circuit entered the delay protection operating state, the thyristor SCR triggering of delay time, thus make the disconnection of assembly unit circuit breaker, cut off the electricity supply.
Under-voltage protecting circuit is made of thyristor SCR, resistance R 1, R2, R3, R4, R5, capacitor C 1, C4, C5, voltage-stabiliser tube D1, diode D3, triode Q.The emitter (with the R4 connecting pin) of triode Q forms the voltage about 12V after the energising, R1, R2 form under-voltage bleeder circuit, Q is the PNP pipe, when its base voltage is lower than the about 0.7V of the emitter voltage left and right sides, the Q conducting, source current is through R4 after the conducting, and triode Q, R5, D3 be to the grid of thyristor SCR, thereby triggers thyristor SCR.When the 400V rated voltage, triode Q base voltage is greater than emitter voltage, not conducting of triode Q, and thyristor SCR is in cut-off state.When supply voltage descends, R2 is connected in series point voltage with R1 and also descends, triode Q base voltage and then descends, and D1 is a voltage stabilizing didoe, and triode Q emitter voltage can not descend, so when supply voltage drops to the low-voltage scope, when triode Q base voltage is lower than the about 0.7V of the emitter left and right sides of triode Q, triode Q conducting, thyristor SCR triggering and conducting, tripping coil TQ action, circuit breaker cuts off three phase mains.
Open-phase protection: open-phase protection circuit is under-voltage protecting circuit just; when A, B, C three-phase phase shortage; can cause three-phase commutation bridge ZL commutating voltage to be reduced to 1.414Ua (Ua represents the single-phase voltage value); the bleeder circuit that R1, R2 are constituted is exported less than the under-voltage protection operating value of setting; thyristor SCR triggering and conducting; tripping coil TQ action, circuit breaker cuts off three phase mains.
Inductive load can cause voltage to descend suddenly starting moment, can normally start in order to protect inductive load, and the utility model is provided with rc-delay circuit in under-voltage protecting circuit, and delay time can be according to resistance value size or capacitance size adjustment.
Tripping coil TQ is series in the output loop of three-phase commutation bridge ZL, its inner iron core control tripping mechanism.
The utlity model has following characteristics: overload and short-circuit protection function, over-voltage protection function, under voltage protection function are arranged; phase failure protection function, also have isolation features, product shape safety and comfort attractive in appearance, lever operated, " branch " " close " and have distinguishing mark, easy for installation, reliable in action.
The utility model is applicable to three-phase, exchanges 50HZ, and in the circuit of rated operational voltage 230V/400V, overvoltage, under voltage protection value can be formulated according to customer requirements.Be widely used in industries such as dwelling house, building, electric power, post and telecommunications, traffic, industrial and mining enterprises.
Claims (6)
1. multi-functional three-phase breaker, it comprises housing (1) and inner thermal overload release thereof, it is characterized in that, increase an electronic trip unit, described electronic trip unit is by three-phase commutation bridge (ZL), under-voltage open-phase detection circuit, the over-voltage detection circuit button triggers executive circuit and forms, the ac input end of described three-phase commutation bridge (ZL) connects three phase mains, described triggering executive circuit is made up of tripping coil (TQ) and thyristor (SCR), the negative electrode of described thyristor (SCR) connects three-phase commutation bridge (ZL) negative pole, anode connects three-phase commutation bridge (ZL) positive pole through tripping coil (TQ), grid connects the output of under-voltage open-phase detection circuit and over-voltage detection circuit, the tripping mechanism of described tripping coil (TQ) control circuit breaker.
2. according to the described multi-functional three-phase breaker of claim 1, it is characterized in that, described under-voltage open-phase detection circuit is by PNP triode (Q), first voltage-stabiliser tube (D1), resistance and electric capacity are formed, first resistance (R1) and second resistance (R2) are connected into the output voltage that series connection meets three-phase commutation bridge (ZL) behind the bleeder circuit, the output signal of their serial connections point connects triode (Q) base stage through the 3rd resistance (R3), the 4th resistance (R4) and first voltage-stabiliser tube (D1) are concatenated into the output voltage that voltage stabilizing circuit meets three-phase commutation bridge (ZL), the voltage of first voltage-stabiliser tube (D1) output is connected to the emitter of triode (Q), and the delay circuit that the collector electrode of triode (Q) is connected into via the 5th resistance (R5) and first electric capacity (C1) connects thyristor (SCR) grid.
3. according to claim 1 or 2 described multi-functional three-phase breakers, it is characterized in that, described over-voltage detection circuit is made up of second voltage-stabiliser tube (D2), the 6th resistance (R6), variable resistor (R8) and second electric capacity (C2), the 6th resistance (R6) and the output voltage that meets three-phase commutation bridge (ZL) after variable resistor (R8) is connected into the bleeder circuit of connecting, the overvoltage signal of their serial connections point output connects thyristor (SCR) grid through second voltage-stabiliser tube (D2), and second electric capacity (C2) is the filter capacitor of overvoltage signal.
4. according to the described multi-functional three-phase breaker of claim 3, it is characterized in that, be provided with anti-interference capacitor (C4) between the grid of described thyristor (SCR) and the negative electrode.
5. according to the described multi-functional three-phase breaker of claim 4, it is characterized in that, described under-voltage open-phase detection circuit and over-voltage detection circuit also and be connected to resistance capaciting absorpting circuit, described resistance capaciting absorpting circuit is in series by the 3rd electric capacity (C3) and the 7th resistance (R7).
6. according to the described multi-functional three-phase breaker of claim 5, it is characterized in that described electronic trip unit is installed in the attachment housings (2) of circuit breaker one side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206770939U CN201904601U (en) | 2010-12-23 | 2010-12-23 | Multifunctional three-phase circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206770939U CN201904601U (en) | 2010-12-23 | 2010-12-23 | Multifunctional three-phase circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201904601U true CN201904601U (en) | 2011-07-20 |
Family
ID=44275194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206770939U Expired - Fee Related CN201904601U (en) | 2010-12-23 | 2010-12-23 | Multifunctional three-phase circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201904601U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780203A (en) * | 2012-07-31 | 2012-11-14 | 德力西电气有限公司 | Overvoltage and under-voltage protection circuit |
| CN104242231A (en) * | 2013-06-17 | 2014-12-24 | 海洋王（东莞）照明科技有限公司 | Lamp voltage protection circuit and lamp |
-
2010
- 2010-12-23 CN CN2010206770939U patent/CN201904601U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780203A (en) * | 2012-07-31 | 2012-11-14 | 德力西电气有限公司 | Overvoltage and under-voltage protection circuit |
| CN104242231A (en) * | 2013-06-17 | 2014-12-24 | 海洋王（东莞）照明科技有限公司 | Lamp voltage protection circuit and lamp |
| CN104242231B (en) * | 2013-06-17 | 2018-10-12 | 海洋王（东莞）照明科技有限公司 | Lamps and lanterns voltage protection circuit and lamps and lanterns |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 071051 Chaoyang North Street, Hebei, Baoding, No. 266 Patentee after: HEBEI BAO KAY ELECTRIC Co.,Ltd. Address before: 071051 Chaoyang North Street, Hebei, Baoding, No. 266 Patentee before: Hebei bao kay electric Co.,Ltd. |
|
| CP03 | Change of name, title or address |
Address after: 071051 Chaoyang North Street, Hebei, Baoding, No. 266 Patentee after: Hebei bao kay electric Co.,Ltd. Address before: 071051 No. 1508 sunny north street, new urban district, Hebei, Baoding Patentee before: HEBEI BAOKAI ELECTRICAL EQUIPMENT Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110720 Termination date: 20171223 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |