CN203589682U - Three-phase power source over-current protection relay - Google Patents
Three-phase power source over-current protection relay Download PDFInfo
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- CN203589682U CN203589682U CN201320806083.4U CN201320806083U CN203589682U CN 203589682 U CN203589682 U CN 203589682U CN 201320806083 U CN201320806083 U CN 201320806083U CN 203589682 U CN203589682 U CN 203589682U
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- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 238000005070 sampling Methods 0.000 abstract 4
- 239000002184 metal Substances 0.000 abstract 1
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- 230000036632 reaction speed Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The utility model discloses a three-phase power source over-current protection relay. The three-phase power source over-current protection relay comprises a circuit module, wherein the circuit module comprises sampling circuits, a compassion circuit, a driving circuit and a contactor, current of each phase of a three-phase power source is sampled respectively by the three sampling circuits, the acquired currents are transmitted to the comparison circuit and are than compared with a pre-set value, and the contactor is controlled to do motion by the driving circuit through a feedback signal of the comparison circuit. The three-phase power source over-current protection relay takes a current transformer as a current sampling device, the three sampling circuits respectively form an OR gate circuit through diodes, when the current value of any phase of the three-phase power source is greater than the pre-set value, the contactor is released, and the power source is cut off through a contact to realize a circuit protection function. Compared with the prior art, the current transformer is utilized to replace traditional double metal sheets, so a response speed is fast, sensitivity is high, no environment temperature influence is exerted, adjustment is relatively convenient, and control precision of the over-current protection current is relatively high.
Description
Technical field
The utility model relates to a kind of overcurrent protection relay of three-phase source, belongs to relay technical field.
Background technology
The Main Function of overcurrent protection relay of three-phase source is automatic disconnecting consumers when the arbitrary phase current overload of power supply, and protection power source and load are not burnt.At present, generally adopt thermal relay as overload protection element.When circuit load is transshipped, the current strength in circuit increases, and circuit heating quantitative change is large; the bimetal leaf of thermal relay deforms when temperature raises, and will have contact with and back down, thereby make contact disjunction when deflection acquires a certain degree; cut off the electricity supply, play overload protective function.
The shortcoming of such overcurrent protection relay is: (1) overcurrent protection Current Control precision is lower, and because bimetal leaf is by temperature distortion, so be easily subject to the impact of ambient temperature, overcurrent protection Current Control deviation is larger; (2) sensitivity is low, and reaction speed is slow, can not cut off in time external power source; (3) after over current fault is got rid of, need wait for that bimetal leaf recovers could normally to work after normal temperature, efficiency is low.
Summary of the invention
The purpose of this utility model is: provide a kind of overcurrent protection Current Control precision higher; reaction speed is fast; highly sensitive and after over current fault is got rid of, can recover the overcurrent protection relay of three-phase source of normal work, thus overcome the above-mentioned deficiency of prior art.
The technical solution of the utility model: a kind of overcurrent protection relay of three-phase source; include circuit module; its circuit module includes sample circuit, comparison circuit, drive circuit, contactor; No. three sample circuits are sampled to each phase current of three phase mains; the current value collecting passes to comparison circuit and preset value compares, and drive circuit moves by the feedback signal control contactor of comparison circuit.
Above-mentioned overcurrent protection relay of three-phase source, in described sample circuit, after the negative electrode of the first diode is connected with the first resistor in series, be connected to respectively again the 4th resistor, one end of the first capacitor and the anode of the 4th diode that are connected in parallel, the first current transformer is connected with three phase mains A, the anode of the first diode is connected with first current transformer one end, and the other end of the 4th resistor, the first capacitor is ground connection and be connected to the other end of the first current transformer respectively; After the negative electrode of the second diode is connected with the second resistor in series, be connected to respectively again the 5th resistor, one end of the second capacitor and the anode of the 5th diode that are connected in parallel, the second current transformer is connected with three phase mains B, the anode of the second diode is connected with second current transformer one end, and the other end of the 5th resistor, the second capacitor is ground connection and be connected to the other end of the second current transformer respectively; After the negative electrode of the 3rd diode is connected with the 3rd resistor in series, be connected to respectively again the 6th resistor, one end of the 3rd capacitor and the anode of the 6th diode that are connected in parallel, the 3rd current transformer is connected with three phase mains C, the anode of the 3rd diode is connected with the 3rd current transformer one end, and the other end of the 6th resistor, the 3rd capacitor is connected to the other end of the 3rd current transformer; The negative electrode of the 4th diode, the 5th diode, the 6th diode is connected to respectively the 4th capacitor and the 7th resistor, and other one end of the 4th capacitor is connected with the 3rd current transformer one end.
Above-mentioned overcurrent protection relay of three-phase source, in described comparison circuit, the other end of the 7th resistor is connected to respectively end of oppisite phase and the 8th resistor of voltage comparator, and the 8th other one end of resistor is connected to DC power cathode; The 9th resistor one end is connected to DC power anode, the other end is connected to respectively the power input of negative electrode, the 5th capacitor and the voltage comparator of the tenth resistor, the 7th voltage stabilizing didoe, the 7th voltage stabilizing didoe anode, the 5th capacitor other end ground connection, the tenth resistor other end connects respectively the in-phase end of the 11 resistor and voltage comparator, and the other end of the 11 resistor is connected to DC power cathode.
Above-mentioned overcurrent protection relay of three-phase source; in described drive circuit; the output of voltage comparator is connected to the base stage of the first triode after being connected with the 12 resistor; the collector electrode of the first triode is connected to relay coil negative terminal; relay coil anode is connected with DC power anode, and the first transistor emitter is connected to DC power cathode.
Above-mentioned overcurrent protection relay of three-phase source, described contactor coil one end is connected with DC power anode, and the other end is normally closed with relay, normally opened contact is connected.
Above-mentioned overcurrent protection relay of three-phase source, described circuit module also includes malfunction indicator lamp, and malfunction indicator lamp one end is connected with DC power anode, and the other end is normally closed with relay, normally opened contact is connected.
The beneficial effects of the utility model: overcurrent protection relay of three-phase source of the present utility model is to using current transformer as current sample device; No. three sample circuits form OR circuit by diode respectively; when arbitrary phase current values of three phase mains is greater than preset value; contactor discharges; by break of contact power supply, thereby realize circuit protection function.Compared with the prior art, the utility model adopts current transformer to replace traditional bimetal leaf, its reaction speed is fast, highly sensitive and be not subject to the impact of ambient temperature, and protective current to set be to realize by adjusting resistance device, adjust more convenient, overcurrent protection Current Control precision is higher; The utility model can recover normal work after over current fault is got rid of, and efficiency is high.The features such as the utility model also has that reliability is high, failure rate is low, and assembling, debugging are convenient, range of application is wider.
Accompanying drawing explanation
Reference numeral: 1-sample circuit, 2-comparison circuit, 3-drive circuit, 4-contactor, 5-malfunction indicator lamp.
Embodiment
Embodiment of the present utility model: a kind of overcurrent protection relay of three-phase source; as shown in Figure 1; relay comprises circuit module; its circuit module includes sample circuit 1, comparison circuit 2, drive circuit 3, contactor 5; each phase current of 1 pair of three phase mains of No. three sample circuits is sampled; the current value collecting passes to comparison circuit 2 and compares with preset value, and drive circuit 3 is by feedback signal control contactor 5 actions of comparison circuit 2.
In sample circuit 1, after the negative electrode of the first diode D1 and the first resistor R1 are connected in series, be connected to respectively again the one end of the 4th resistor R4, the first capacitor C1 and the anode of the 4th diode D4 that are connected in parallel, the first current transformer L1 is connected with three phase mains A, the anode of the first diode D1 is connected with first current transformer L1 one end, and the other end of the 4th resistor R4, the first capacitor C1 is ground connection and be connected to the other end of the first current transformer L1 respectively; After the negative electrode of the second diode D2 and the second resistor R2 are connected in series, be connected to respectively again the one end of the 5th resistor R5, the second capacitor C2 and the anode of the 5th diode D5 that are connected in parallel, the second current transformer L2 is connected with three phase mains B, the anode of the second diode D2 is connected with second current transformer L2 one end, and the other end of the 5th resistor R5, the second capacitor C2 is ground connection and be connected to the other end of the second current transformer L2 respectively; After the negative electrode of the 3rd diode D3 and the 3rd resistor R3 are connected in series, be connected to respectively again the one end of the 6th resistor R6, the 3rd capacitor C3 and the anode of the 6th diode D6 that are connected in parallel, the 3rd current transformer L3 is connected with three phase mains C, the anode of the 3rd diode D3 is connected with the 3rd current transformer L3 one end, and the other end of the 6th resistor R6, the 3rd capacitor C3 is connected to the other end of the 3rd current transformer L3; The negative electrode of the 4th diode D4, the 5th diode D5, the 6th diode D6 is connected to respectively the 4th capacitor C4 and the 7th resistor R7, and other one end of the 4th capacitor C4 is connected with the 3rd current transformer L3 one end.
And in comparison circuit 2, the other end of the 7th resistor R7 is connected to respectively end of oppisite phase and the 8th resistor R8 of voltage comparator ic, the 8th other one end of resistor R8 is connected to DC power cathode; The 9th resistor R9 one end is connected to DC power anode, the other end is connected to respectively the power input of negative electrode, the 5th capacitor C5 and the voltage comparator ic of the tenth resistor R10, the 7th voltage stabilizing didoe D7, the 7th voltage stabilizing didoe D7 anode, the 5th capacitor C5 other end ground connection, the tenth resistor R10 other end connects respectively the in-phase end of the 11 resistor R11 and voltage comparator ic, and the other end of the 11 resistor R11 is connected to DC power cathode.
In drive circuit 3, the output of voltage comparator ic is connected to the base stage of the first triode BG after being connected with the 12 resistor R12, the collector electrode of the first triode BG is connected to relay J coil negative terminal, relay J coil anode is connected with DC power anode, and the first triode BG emitter is connected to DC power cathode.
And contactor 5 coil one end are connected with DC power anode, the other end is normally closed with relay J, normally opened contact is connected.
At circuit module, also include malfunction indicator lamp 4, malfunction indicator lamp 4 one end are connected with DC power anode, and the other end is normally closed with relay J, normally opened contact is connected.
Operation principle of the present utility model: while connecting DC power supply, power supply provides burning voltage through voltage regulation filtering for voltage comparator ic, the tenth resistor R10, the 11 resistor R11 form bleeder circuit, for voltage comparator ic in-phase end provides reference voltage, now voltage comparator ic end of oppisite phase is zero level, voltage comparator ic output output high level, contactor 5 actions, contactor 5 contact conversions, connect three phase mains.Electric current increase when the arbitrary phase of three phase mains (A phase, B phase or C phase); the output voltage of three current transformers (L1, L2 or L3) increases; voltage comparator ic end of oppisite phase voltage increases thereupon; while reaching reference voltage; output low level, malfunction indicator lamp 4 is bright, and contactor 5 discharges; cut off three phase mains, realize overcurrent protection function.After seeing that malfunction indicator lamp 4 lights, attendant can know it is that over current fault occurs, thereby in time fault is got rid of.
Claims (6)
1. an overcurrent protection relay of three-phase source; it is characterized in that: relay comprises circuit module; its circuit module includes sample circuit (1), comparison circuit (2), drive circuit (3), contactor (5); No. three sample circuits (1) are sampled to each phase current of three phase mains; the current value collecting passes to comparison circuit (2) and compares with preset value, and drive circuit (3) is by feedback signal control contactor (5) action of comparison circuit (2).
2. overcurrent protection relay of three-phase source according to claim 1, it is characterized in that: in described sample circuit (1), after the negative electrode of the first diode (D1) and the first resistor (R1) are connected in series, be connected to respectively again the 4th resistor (R4) being connected in parallel, the anode of one end of the first capacitor (C1) and the 4th diode (D4), the first current transformer (L1) is connected with three phase mains A, the anode of the first diode (D1) is connected with the first current transformer (L1) one end, the 4th resistor (R4), the other end of the first capacitor (C1) is ground connection and the other end that is connected to the first current transformer (L1) respectively, after the negative electrode of the second diode (D2) and the second resistor (R2) are connected in series, be connected to respectively again the 5th resistor (R5), one end of the second capacitor (C2) and the anode of the 5th diode (D5) that are connected in parallel, the second current transformer (L2) is connected with three phase mains B, the anode of the second diode (D2) is connected with the second current transformer (L2) one end, and the other end of the 5th resistor (R5), the second capacitor (C2) is ground connection and the other end that is connected to the second current transformer (L2) respectively, after the negative electrode of the 3rd diode (D3) and the 3rd resistor (R3) are connected in series, be connected to respectively again the 6th resistor (R6), one end of the 3rd capacitor (C3) and the anode of the 6th diode (D6) that are connected in parallel, the 3rd current transformer (L3) is connected with three phase mains C, the anode of the 3rd diode (D3) is connected with the 3rd current transformer (L3) one end, and the other end of the 6th resistor (R6), the 3rd capacitor (C3) is connected to the other end of the 3rd current transformer (L3), the negative electrode of the 4th diode (D4), the 5th diode (D5), the 6th diode (D6) is connected to respectively the 4th capacitor (C4) and the 7th resistor (R7), and other one end of the 4th capacitor (C4) is connected with the 3rd current transformer (L3) one end.
3. overcurrent protection relay of three-phase source according to claim 1, it is characterized in that: in described comparison circuit (2), the other end of the 7th resistor (R7) is connected to respectively end of oppisite phase and the 8th resistor (R8) of voltage comparator (IC), and the 8th resistor (R8) is connected to DC power cathode in one end in addition; The 9th resistor (R9) one end is connected to DC power anode, the other end is connected to respectively the power input of negative electrode, the 5th capacitor (C5) and the voltage comparator (IC) of the tenth resistor (R10), the 7th voltage stabilizing didoe (D7), the 7th voltage stabilizing didoe (D7) anode, the 5th capacitor (C5) other end ground connection, the tenth resistor (R10) other end connects respectively the in-phase end of the 11 resistor (R11) and voltage comparator (IC), and the other end of the 11 resistor (R11) is connected to DC power cathode.
4. overcurrent protection relay of three-phase source according to claim 1; it is characterized in that: in described drive circuit (3); the output of voltage comparator (IC) is connected to the base stage of the first triode (BG) after being connected with the 12 resistor (R12); the collector electrode of the first triode (BG) is connected to relay (J) coil negative terminal; relay (J) coil anode is connected with DC power anode, and the first triode (BG) emitter is connected to DC power cathode.
5. overcurrent protection relay of three-phase source according to claim 1, is characterized in that: described contactor (5) coil one end is connected with DC power anode, and the other end is normally closed with relay (J), normally opened contact is connected.
6. overcurrent protection relay of three-phase source according to claim 1; it is characterized in that: described circuit module also includes malfunction indicator lamp (4); malfunction indicator lamp (4) one end is connected with DC power anode, and the other end is normally closed with relay (J), normally opened contact is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320806083.4U CN203589682U (en) | 2013-12-10 | 2013-12-10 | Three-phase power source over-current protection relay |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320806083.4U CN203589682U (en) | 2013-12-10 | 2013-12-10 | Three-phase power source over-current protection relay |
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| Publication Number | Publication Date |
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| CN203589682U true CN203589682U (en) | 2014-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320806083.4U Expired - Lifetime CN203589682U (en) | 2013-12-10 | 2013-12-10 | Three-phase power source over-current protection relay |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953537A (en) * | 2015-07-27 | 2015-09-30 | 福一开电气有限公司 | Overload protection switching device |
| CN108780990A (en) * | 2017-09-06 | 2018-11-09 | 深圳和而泰智能控制股份有限公司 | Device for power switching current foldback circuit and motor driven systems, electric system |
| CN109980610A (en) * | 2019-04-01 | 2019-07-05 | 深圳盈特创智能科技有限公司 | A kind of hardware current foldback circuit |
| CN111162663A (en) * | 2020-01-17 | 2020-05-15 | 科华恒盛股份有限公司 | Voltage division circuit and switching power supply |
| CN111431144A (en) * | 2020-03-17 | 2020-07-17 | 神华神东电力有限责任公司 | Generator protection device and method |
-
2013
- 2013-12-10 CN CN201320806083.4U patent/CN203589682U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953537A (en) * | 2015-07-27 | 2015-09-30 | 福一开电气有限公司 | Overload protection switching device |
| CN108780990A (en) * | 2017-09-06 | 2018-11-09 | 深圳和而泰智能控制股份有限公司 | Device for power switching current foldback circuit and motor driven systems, electric system |
| CN109980610A (en) * | 2019-04-01 | 2019-07-05 | 深圳盈特创智能科技有限公司 | A kind of hardware current foldback circuit |
| CN111162663A (en) * | 2020-01-17 | 2020-05-15 | 科华恒盛股份有限公司 | Voltage division circuit and switching power supply |
| CN111431144A (en) * | 2020-03-17 | 2020-07-17 | 神华神东电力有限责任公司 | Generator protection device and method |
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Granted publication date: 20140507 |