CN203761023U - Low voltage electric appliance's thyristor protection apparatus - Google Patents
Low voltage electric appliance's thyristor protection apparatus Download PDFInfo
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- CN203761023U CN203761023U CN201420136203.9U CN201420136203U CN203761023U CN 203761023 U CN203761023 U CN 203761023U CN 201420136203 U CN201420136203 U CN 201420136203U CN 203761023 U CN203761023 U CN 203761023U
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Abstract
The utility model discloses a low voltage electric appliance's thyristor protection apparatus. The technical solutions of the utility model are as follows. The protection apparatus comprises an alternating current power supply, an over-voltage protection circuit, an under-voltage protection circuit, a voltage stabilizing and controlling circuit, a self-locking circuit for blackouts, and an electricity leakage protection circuit. The alternating current power supply comprises a pile of auto-coupling rectifier bridges QL, a filtering capacitance C1 and an integrated voltage stabilizing module LM7812. The integrated voltage stabilizing module provides a power supply from its output end; the normally closed node KM1 of the relay on the over-voltage protection circuit, the normally open node KM2 of the relay on the under-voltage protection circuit, the normally open node KM42 of the relay on the self-locking circuit for blackouts, and the normally closed node KM5 of the relay on the electricity leakage protection circuit are connected in series through the switching node KM3 of the relay on the voltage stabilizing and controlling circuit and outputted to the fire wire of socket CZ. The utility model integrates into one the functions of voltage stabilizing, over-voltage protection, electricity leakage protection and self-locking when blackouts occur. The utility model comprehensively protects low voltage equipment and the safety of employees by preventing electric equipment from being damaged. In this manner, economic loss can be reduced to its lowest level.
Description
Technical field
The utility model relates to a kind of thyristor protection device, particularly a kind of low-voltage electrical apparatus thyristor protection device.
Background technology
Flourish along with China's economic construction, society is growing to the demand of electric power resource, and user is also more and more higher to the requirement of electric power system.The major issue that the reliability and stability of power supply have become guarantee economic growth and met consumers' demand.The stability that ensures power supply is also to improve inside and outside investment environment, meet the growing living standard of the people and promote the important embodiment of overall national strength.The Reason-study that voltage stability destroys is thought, the main cause that voltage collapse is on the rise have following some: the one, due to economically and the consideration of other side (as environmental protection), the intensity send out, transmission facility using approaches limiting value day by day, the 2nd, parallel capacity reactive compensation rolls up, thereby in the time of voltage drop, the reactive power providing to electrical network declines by voltage squared, the 3rd, the switching of circuit or equipment, causes that the possibility of voltage fluctuation is often much bigger than three-phase shortcircuit situation.The physical essence of power system stability problem is power-balance problem in system, and the prerequisite of power system operation is to have a balance point.The stable problem of electric power system, says the node power equilibrium problem of namely loading on bus intuitively.Between the reactive power that reactive power that node provides and load consume, can reach this kind of balance, and balance point there is disturbance suppression and maintain load busbar voltage ability, electric power system is voltage stabilization, if otherwise system cannot maintain this balance, will cause the continuous decline of system voltage.In addition, due to 1, load user's existence greatly, such as the start of factory's electricity consumption and shutdown time, will impact electrical network, cause voltage instability; 2, the fault in transmission and distribution networks, as short circuit, open circuit, ground connection also has relaying protection switch motion, all can cause line voltage shakiness; 3, in electrical network, the too many compensation of reactive power consumption not, also can cause voltage to fall; 4, also has power plant, the appearance of new forms of energy especially now, the switching of for example wind power generation and solar power plant, in the time that wind friction velocity is inadequate, wind energy turbine set will exit electrical network, can not be to mains supply, also can impact electrical network, voltage also can be unstable.Also have electrical network to be struck by lightning, also can cause supply power voltage unstable, cause power consumption equipment to damage.Developing a kind of effective low-voltage electrical apparatus protective device for this reason, avoid power consumption equipment to damage, economic loss is dropped to minimum, is every power technology personnel's responsibility.
Summary of the invention
The purpose of this utility model is exactly in view of the foregoing defects the prior art has; a kind of low-voltage electrical apparatus thyristor protection device is provided; this device integrates voltage stabilizing, overvoltage/undervoltage protection, earth leakage protective and Powercut self locking power, omnibearing protection low voltage equipment and personal safety.
Its technical scheme is: comprise DC power supply, overvoltage crowbar, under-voltage protecting circuit, controlling circuit of voltage regulation, Powercut self locking power circuit and leakage protection circuit, described DC power supply is made up of autotransformer T, rectifier bridge stack QL, filter capacitor C1, integrated package of pressure-stabilizing LM7812, the input of autotransformer T connects 220V power supply by battery main switch S, lead up to rectifier bridge stack QL and the filter capacitor C1 of output are connected to integrated package of pressure-stabilizing LM7812, and the second tunnel of output is connected to leakage protection circuit; The output of integrated package of pressure-stabilizing LM7812 provides power supply for overvoltage crowbar, under-voltage protecting circuit, controlling circuit of voltage regulation, Powercut self locking power circuit, described overvoltage crowbar is connected to form by resistance R 1, resistance R 2, potentiometer W1, relay K M1, thyristor SUR1, fly-wheel diode V1, capacitor C 2, the trigger electrode of thyristor SUR1 is connected to potentiometer W1 by resistance R 2, and the anodic bonding of thyristor SUR1 is to relay K M1; Described leakage protection circuit is made up of resistance R 7, resistance R 8, diode V4, diode V5, luminous tube LED, optocoupler H, thyristor SUR4, relay K M5, accessory power outlet CZ earth terminal be connected to optocoupler H by resistance R 7, diode V4 and luminous tube LED, the output of optocoupler H is connected to relay K M5; In live wire the normally closed node KM5 of the relay of the normal opened contact KM42 of the relay of often opening node KM2, Powercut self locking power circuit of the relay of the normally closed node KM1 of the relay of overvoltage crowbar, under-voltage protecting circuit, leakage protection circuit by the relay changeover contact KM3 series connection access accessory power outlet CZ of controlling circuit of voltage regulation.
Above-mentioned under-voltage protecting circuit is made up of resistance R 3, resistance R 4, potentiometer W2, relay K M2, thyristor SUR2, fly-wheel diode V2, capacitor C 3; the trigger electrode of thyristor SUR2 is connected to potentiometer W2 by resistance R 4, and the anodic bonding of thyristor SUR2 is to relay K M2.
Above-mentioned controlling circuit of voltage regulation is made up of resistance R 5, resistance R 6, potentiometer W3, relay K M3, thyristor SUR3, fly-wheel diode V3, capacitor C 4, the trigger electrode of thyristor SUR3 is connected to potentiometer W3 by resistance R 6, and the anodic bonding of thyristor SUR3 is to relay K M3.
Above-mentioned Powercut self locking power circuit is connected to form by relay K M4 and start button QA.
The beneficial effects of the utility model are: adopt large power autotransformer to realize the function of circuit; integrate voltage stabilizing, overvoltage/undervoltage protection, earth leakage protective and Powercut self locking power; omnibearing protection low voltage equipment and personal safety, avoid power consumption equipment to damage, and economic loss dropped to minimum.
Brief description of the drawings
Accompanying drawing 1 is circuit connection diagram of the present utility model;
Accompanying drawing 2 is outline drawings of the present utility model;
In upper figure: resistance R 1, resistance R 2, potentiometer W1, relay K M1, thyristor SUR1, fly-wheel diode V1, capacitor C 2; Resistance R 3, resistance R 4, potentiometer W2, relay K M2, thyristor SUR2, fly-wheel diode V2, capacitor C 3; Resistance R 5, resistance R 6, potentiometer W3, relay K M3, thyristor SUR3, fly-wheel diode V3, capacitor C 4; Relay K M4, start button QA; Resistance R 7, resistance R 8, diode V4, diode V5, luminous tube LED, optocoupler H, thyristor SUR4, relay K M5; Autotransformer T, rectifier bridge stack QL, filter capacitor C1, integrated package of pressure-stabilizing LM7812, battery main switch S, socket CZ.
Embodiment
1-2 by reference to the accompanying drawings, the utility model will be further described:
The utility model comprises DC power supply, overvoltage crowbar, under-voltage protecting circuit, controlling circuit of voltage regulation, Powercut self locking power circuit and leakage protection circuit, described DC power supply is made up of autotransformer T, rectifier bridge stack QL, filter capacitor C1, integrated package of pressure-stabilizing LM7812, the input of autotransformer T connects 220V power supply by battery main switch S, lead up to rectifier bridge stack QL and the filter capacitor C1 of output are connected to integrated package of pressure-stabilizing LM7812, and the second tunnel of output is connected to leakage protection circuit; The output of integrated package of pressure-stabilizing LM7812 provides power supply for overvoltage crowbar, under-voltage protecting circuit, controlling circuit of voltage regulation, Powercut self locking power circuit, described overvoltage crowbar is connected to form by resistance R 1, resistance R 2, potentiometer W1, relay K M1, thyristor SUR1, fly-wheel diode V1, capacitor C 2, the trigger electrode of thyristor SUR1 is connected to potentiometer W1 by resistance R 2, and the anodic bonding of thyristor SUR1 is to relay K M1; Described leakage protection circuit is made up of resistance R 7, resistance R 8, diode V4, diode V5, luminous tube LED, optocoupler H, thyristor SUR4, relay K M5, accessory power outlet CZ earth terminal be connected to optocoupler H by resistance R 7, diode V4 and luminous tube LED, the output of optocoupler H is connected to relay K M5; In live wire the normally closed node KM5 of the relay of the normal opened contact KM42 of the relay of often opening node KM2, Powercut self locking power circuit of the relay of the normally closed node KM1 of the relay of overvoltage crowbar, under-voltage protecting circuit, leakage protection circuit by the relay changeover contact KM3 series connection access accessory power outlet CZ of controlling circuit of voltage regulation.
Wherein, under-voltage protecting circuit is made up of resistance R 3, resistance R 4, potentiometer W2, relay K M2, thyristor SUR2, fly-wheel diode V2, capacitor C 3; the trigger electrode of thyristor SUR2 is connected to potentiometer W2 by resistance R 4, and the anodic bonding of thyristor SUR2 is to relay K M2.
Controlling circuit of voltage regulation is made up of resistance R 5, resistance R 6, potentiometer W3, relay K M3, thyristor SUR3, fly-wheel diode V3, capacitor C 4, the trigger electrode of thyristor SUR3 is connected to potentiometer W3 by resistance R 6, and the anodic bonding of thyristor SUR3 is to relay K M3.
Powercut self locking power circuit is connected to form by relay K M4 and start button QA; Resistance R 1, potentiometer W1, resistance R 3, potentiometer W2, resistance R 5, potentiometer W3 are respectively the sample circuits of overvoltage, under-voltage, voltage stabilizing circuit, and in circuit, T is jumbo autotransformer.
Circuit performance index:
1, voltage stabilized range: 198V---240V;
2, overvoltage operating value: 245V;
3, low-voltage value: 150V;
4, leakage current operating value: 1mA
5, cut off load current value: 10A.
Circuit working process of the present utility model is as follows: power turn-on master switch S, civil power 220V power supply is added to autotransformer T input, the alternating current of output tap 1 after rectifier bridge stack QL rectification, C1 filtering, integrated package of pressure-stabilizing LM7812 voltage stabilizing for follow-up electronic circuit provides a stable 12V direct voltage.
1, the realization of voltage stabilizing function: autotransformer T output tap 1 is that 220V(and input are 1:1 no-load voltage ratios), when input voltage is at 198V-240V(positive and negative 10%) in normal range (NR) time, relay K M3 action adhesive (adjusting potentiometer W3) in voltage stabilizing circuit, its normal opened contact KM3 closure, connects autotransformer 1 end.If input voltage is reduced to 190V, the voltage (that is the voltage at capacitor C 1 two ends) of rectification output also declines, voltage on sample circuit R5 W3 is also declined, and the dividing potential drop on potentiometer W3 also declines, thyristor SUR3 trigger electrode lower voltage, in the time of alternating current zero crossing, turn-off, relay K M3 returns, and normally closed contact KM3 connects autotransformer 2 ends, increases output umber of turn, boost and make output voltage get back to 220V, realize voltage stabilizing function.
2, under-voltage protection function is realized: if when supply voltage is significantly reduced to 150V down; improved 30V output voltage although export umber of turn by increase when supply voltage declines before this, output voltage does not still reach the qualified electricity consumption scope of 198V too much because supply voltage declines.So; voltage on under-voltage sample circuit R3 W2 also declines to a great extent thereupon, point drops on potentiometer W2, the thyristor SUR2 trigger electrode voltage drop that it connects; when the trigger voltage lower than it; and in the time of alternating current zero passage, SUR2 turn-offs, and the relay K M2 dead electricity that its anode connects is returned; its normal opened contact KM2 disconnects accessory power outlet CZ; the power supply of cutoff low electrical equipment, prevents that electrical equipment from damaging, and realizes under-voltage protection function.
3, over-voltage protecting function is realized: in the time that supply voltage is elevated to 245V by 240V; exceed qualified electricity consumption scope; voltage on overvoltage protection sample circuit R1 W1 is also corresponding significantly to raise; in the time reaching thyristor SUR1 trigger electrode voltage; SUR1 conducting, the relay K M1 energized action adhesive that anode connects, its normally closed node KM1 disconnects; cut off socket CZ power supply, make electrical appliance avoid high voltage and burn.Now, although voltage stabilizing circuit thyristor SUR3 conducting, relay K M3 is adhesive, normal opened contact connects autotransformer tap 1 position, but output voltage is also elevated to 245V (because this tap is 1:1 no-load voltage ratio), has exceeded voltage stabilized range, so must cut off out-put supply.
4, Powercut self locking power function realizes: in the time of grid power blackout, whole circuit is without electricity, and latching relay KM4 dead electricity is returned, and its normal opened contact KM41, KM42 disconnect.In the time sending a telegram here, although circuit has DC power supply, owing to not pressing start button QA, relay K M4 can not get DC power supply and is failure to actuate again, and its normal opened contact KM42 disconnects, and cuts off output circuit, makes accessory power outlet without electricity, realizes auto-lock function.Now only press start button QA, the adhesive of relay K M4 energized action, normal opened contact KM41 closure, realizes self-sustaining, and another connects out-put supply to normal opened contact KM42 closure, and electrical appliance is worked again.
5, creepage protection function is realized: when hot voltage is leaked electricity to electrical appliance shell, and the electrical appliance earthing of casing is when good, or live wire is while having electric leakage to ground; because there is ohmic leakage, so leakage current not very big is not enough to a secondary fuse RD fusing; now; it is upper that leakage current is added to optocoupler H by resistance R 7, V4, LED, and optocoupler conducting triggers thyristor SUR4; make its conducting; relay K M5 powers up action adhesive, and its normally closed contact KM51 disconnects electrical appliance out-put supply, ensures personal safety.Normal opened contact KM52 closure simultaneously, relay K M5 realizes self-sustaining, prevents the rear relay perseveration of leak current fault excision.Only have after thorough leak current fault processing, press reset button FA, circuit is powered again.
In a word, when input voltage is at 198V-242V(positive and negative 10%) during in normal range (NR) and without electric leakage, overvoltage crowbar is failure to actuate, normally closed contact KM1 closure; Under-voltage protecting circuit action, normal opened contact KM2 closure; Voltage stabilizing circuit action, closed autotransformer T tap 1 end of connecting of normal opened contact KM3.Be relay tip KM1, KM2, KM42, KM5 complete closure, connect low-voltage electrical apparatus socket CZ, electrical appliance is normally worked.Their action situation is by regulating potentiometer W1, W2, W3 separately to solve.
Capacitor C 2 in circuit, the shake that C3, C4 are used for trigger voltage actuating of relay in the time of critical value of eliminating thyristor.Diode V1, V2, V3 are the fly-wheel diodes of relay K M1, KM2, KM3, prevent that the back electromotive force that relay coil produces from damaging thyristor, for coil provides a drain passageway.Overcurrent protection when fuse RD1, RD2 are used for autotransformer and output load short circuits fault.Relay in circuit all selects 12V, contact rating to be greater than 10A's.
Claims (4)
1. a low-voltage electrical apparatus thyristor protection device, it is characterized in that: comprise DC power supply, overvoltage crowbar, under-voltage protecting circuit, controlling circuit of voltage regulation, Powercut self locking power circuit and leakage protection circuit, described DC power supply is made up of autotransformer T, rectifier bridge stack QL, filter capacitor C1, integrated package of pressure-stabilizing LM7812, the input of autotransformer T connects 220V power supply by battery main switch S, lead up to rectifier bridge stack QL and the filter capacitor C1 of output are connected to integrated package of pressure-stabilizing LM7812, and the second tunnel of output is connected to leakage protection circuit; The output of integrated package of pressure-stabilizing LM7812 provides power supply for overvoltage crowbar, under-voltage protecting circuit, controlling circuit of voltage regulation, Powercut self locking power circuit, described overvoltage crowbar is connected to form by resistance R 1, resistance R 2, potentiometer W1, relay K M1, thyristor SUR1, fly-wheel diode V1, capacitor C 2, the trigger electrode of thyristor SUR1 is connected to potentiometer W1 by resistance R 2, and the anodic bonding of thyristor SUR1 is to relay K M1; Described leakage protection circuit is made up of resistance R 7, resistance R 8, diode V4, diode V5, luminous tube LED, optocoupler H, thyristor SUR4, relay K M5, accessory power outlet CZ earth terminal be connected to optocoupler H by resistance R 7, diode V4 and luminous tube LED, the output of optocoupler H is connected to relay K M5; In live wire the normally closed node KM5 of the relay of the normal opened contact KM42 of the relay of often opening node KM2, Powercut self locking power circuit of the relay of the normally closed node KM1 of the relay of overvoltage crowbar, under-voltage protecting circuit, leakage protection circuit by the relay changeover contact KM3 series connection access accessory power outlet CZ of controlling circuit of voltage regulation.
2. low-voltage electrical apparatus thyristor protection device according to claim 1; it is characterized in that: described under-voltage protecting circuit is made up of resistance R 3, resistance R 4, potentiometer W2, relay K M2, thyristor SUR2, fly-wheel diode V2, capacitor C 3; the trigger electrode of thyristor SUR2 is connected to potentiometer W2 by resistance R 4, and the anodic bonding of thyristor SUR2 is to relay K M2.
3. low-voltage electrical apparatus thyristor protection device according to claim 1; it is characterized in that: described controlling circuit of voltage regulation is made up of resistance R 5, resistance R 6, potentiometer W3, relay K M3, thyristor SUR3, fly-wheel diode V3, capacitor C 4; the trigger electrode of thyristor SUR3 is connected to potentiometer W3 by resistance R 6, and the anodic bonding of thyristor SUR3 is to relay K M3.
4. low-voltage electrical apparatus thyristor protection device according to claim 1, is characterized in that: described Powercut self locking power circuit is connected to form by relay K M4 and start button QA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420136203.9U CN203761023U (en) | 2014-03-25 | 2014-03-25 | Low voltage electric appliance's thyristor protection apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420136203.9U CN203761023U (en) | 2014-03-25 | 2014-03-25 | Low voltage electric appliance's thyristor protection apparatus |
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| Publication Number | Publication Date |
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| CN203761023U true CN203761023U (en) | 2014-08-06 |
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| CN201420136203.9U Expired - Fee Related CN203761023U (en) | 2014-03-25 | 2014-03-25 | Low voltage electric appliance's thyristor protection apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104638647A (en) * | 2015-03-04 | 2015-05-20 | 安徽藤蔓电气有限公司 | Intelligent low-voltage electricity using system and electrification switching-on work mode thereof |
| CN105356761A (en) * | 2015-12-11 | 2016-02-24 | 国网四川省电力公司电力科学研究院 | Boost and protection device of auto transformer |
| CN115534708A (en) * | 2022-10-21 | 2022-12-30 | 深圳市量子新能科技有限公司 | Control circuit of ground AC charging pile and AC charging pile |
-
2014
- 2014-03-25 CN CN201420136203.9U patent/CN203761023U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104638647A (en) * | 2015-03-04 | 2015-05-20 | 安徽藤蔓电气有限公司 | Intelligent low-voltage electricity using system and electrification switching-on work mode thereof |
| CN105356761A (en) * | 2015-12-11 | 2016-02-24 | 国网四川省电力公司电力科学研究院 | Boost and protection device of auto transformer |
| CN115534708A (en) * | 2022-10-21 | 2022-12-30 | 深圳市量子新能科技有限公司 | Control circuit of ground AC charging pile and AC charging pile |
| CN115534708B (en) * | 2022-10-21 | 2023-06-23 | 深圳市量子新能科技有限公司 | Control circuit of ground alternating-current charging pile and alternating-current charging pile |
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| 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: 20140806 Termination date: 20150325 |
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| EXPY | Termination of patent right or utility model |