CN103248002A - Electronic-type overload relay with reliable phase-failure protection function - Google Patents
Electronic-type overload relay with reliable phase-failure protection function Download PDFInfo
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- CN103248002A CN103248002A CN2013101811733A CN201310181173A CN103248002A CN 103248002 A CN103248002 A CN 103248002A CN 2013101811733 A CN2013101811733 A CN 2013101811733A CN 201310181173 A CN201310181173 A CN 201310181173A CN 103248002 A CN103248002 A CN 103248002A
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Abstract
The invention relates to an electronic-type overload relay with a reliable phase-failure protection function, which is characterized in that a phase-failure protection circuit of the electronic-type overload relay comprises pin interfacesof output ends ofthree-phase transformers, three rectifier bridge rectifiers, three diodes, a voltage-regulator tube, resistors, capacitors, two AND gate circuits and a pin interface of INT of a single chip microcomputer. The electronic-type overload relay adopts the principle that an AND gate logical operation is used for judging a three-phase voltage signal in the phase-failure protection circuit, so that the reliability of the phase-failure protection circuit is greatly improved; and the electronic-type overload relay has the characteristics of few electronic elements, simple structure and lower cost.
Description
Technical field
The invention belongs to a kind of electronic overload relay, particularly relate to the reliable electronic overload relay of a kind of open phase protection.
Background technology
Be to have adopted from three phase acquisition half-wave voltage signal at present known electronic overload relay phase failure protection function; through electric resistance partial pressure; send into the principle that operational amplifier and voltage reference value compare judgement; this principle is had relatively high expectations to the accuracy of gathering waveform; to the instrument transformer precision require high; the reliability of phase failure protection function is lower, and the protection precision is not easy to guarantee.
Summary of the invention
The present invention provides a kind of reliable, the reliable electronic overload relay of open phase protection simple in structure for solving the technical problem that exists in the known technology.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is: it includes an open-phase protection circuit, it includes described open-phase protection circuit, the INT pin interface of single-chip microcomputer, first, second, the 3rd instrument transformer (CT1, CT2, CT3) electric signal input end of output, first, second, the 3rd rectifier bridge (D1, D2, D3), first, two, three, four, five, six, seven, eight, nine resistance (R1, R2, R3, R4, R5, R6, R7, R8, R9), first, two, three, four, five, six electric capacity (C1, C2, C3, C4, C5, C6), the 4th, five, six diode (D4, D5, D6), voltage-stabiliser tube (D7), first, second AND circuit (the U1, U2); The electric signal input end of the output of described first, second, third instrument transformer (CT1, CT2, CT3) connects the ac input end of described first, second, third rectifier bridge (D1, D2, D3) respectively; Positive output end in the dc output end of described first, second, third rectifier bridge (D1, D2, D3) connects the positive pole of described the 4th, the 5th, the 6th diode (D4, D5, D6) respectively, negative output terminal connects the end of described first, second, third resistance (R1, R2, R3) respectively, another termination GND of described first, second, third resistance (R1, R2, R3); The negative electrode of described voltage-stabiliser tube (D7) meets negative pole and the VCC of described the 4th, the 5th, the 6th diode (D4, D5, D6), and the anode of described voltage-stabiliser tube (D7) meets GND; Described the 4th, the 5th, the 6th electric capacity (C4, C5, C6) is parallel to the two ends of described voltage-stabiliser tube (D7); The common port of described the 4th, the 5th resistance of the A termination of described first AND circuit (U1) (R4, R5), the positive pole of described the 4th diode of another termination of described the 4th resistance (R4) (D4), another termination GND of described the 5th resistance (R5), described first electric capacity (C1) is connected in parallel on the two ends of described the 5th resistance (R5); The common port of described the 6th, the 7th resistance of the B termination of described first AND circuit (U1) (R6, R7), the positive pole of described the 5th diode of another termination of described the 6th resistance (R6) (D5), another termination GND of described the 7th resistance (R7), described second electric capacity (C2) is connected in parallel on the two ends of described the 7th resistance (R7); The common port of described the 8th, the 9th resistance of the A termination of described second AND circuit (U2) (R8, R9), the positive pole of described the 6th diode of another termination of described the 8th resistance (R8) (D6), another termination GND of described the 9th resistance (R9), described the 3rd electric capacity (C3) is connected in parallel on the two ends of described the 9th resistance (R9); The Y end of described first AND circuit of the B termination of described second AND circuit (U2) (U1), the INT pin interface of the described single-chip microcomputer of Y termination of described second AND circuit (U2).
Advantage and good effect that the present invention has are: owing to adopted the principle of judging three-phase voltage signal with the gate logic computing circuit in open-phase protection circuit; Very big raising the reliability of phase failure protection function, and have and use electronic component few, simple in structure, lower-cost characteristics.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
For further understanding content of the present invention, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
As shown in Figure 1, the output of instrument transformer T1, T2, T3 connects the ac input end of rectifier bridge D1, D2, D3 respectively; Positive output end in the dc output end of rectifier bridge D1, D2, D3 connects the positive pole of diode D4, D5, D6 respectively, and negative output terminal is the end of connecting resistance R1, R2, R3 respectively, another termination GND of resistance R 1, R2, R3; The negative electrode of voltage-stabiliser tube D7 connects the negative pole of diode D4, D5, D6 and connects, and the anode of voltage-stabiliser tube D7 meets GND; Capacitor C 4, C5, C6 are parallel to the two ends of voltage-stabiliser tube D7; The A terminating resistor R4 of AND circuit U1, the common port of R5, the positive pole of another terminating diode D4 of resistance R 4, another termination GND of resistance R 5, electric C1) be connected in parallel on the two ends of resistance R 5; The B terminating resistor R6 of AND circuit U1, the common port of R7, the positive pole of another terminating diode D5 of resistance R 6, another termination GND of resistance R 7, capacitor C 2 is connected in parallel on the two ends of resistance R 7; The A terminating resistor R8 of AND circuit U2, the common port of R9, the positive pole of another terminating diode D6 of resistance R 8, another termination GND of resistance R 9, capacitor C 3 is connected in parallel on the two ends of resistance R 9; The Y end of the B termination AND circuit U1 of AND circuit U2, the INT pin interface of the Y termination single-chip microcomputer of AND circuit U2.
The electric current that current transformer CT1, CT2, CT3 induce is after process rectifier bridge D1, D2, D3 rectification, positive output end in the dc output end of rectifier bridge D1, D2, D3 connects the positive pole of diode D4, D5, D6 respectively, negative output terminal is the end of connecting resistance R1, R2, R3 respectively, another termination GND of resistance R 1, R2, R3; The negative electrode of voltage-stabiliser tube D7 connects the negative pole of diode D4, D5, D6, and the anode of voltage-stabiliser tube D7 meets GND; Capacitor C 4, C5, C6 are parallel to the two ends of voltage-stabiliser tube D7, and through voltage stabilizing and the capacitor C 4 of voltage-stabiliser tube D7, C5 produces a galvanic current and presses VCC after the C6 filtering.
Under normal situation, the electric current that current transformer CT1 induces produces the A end that a stable high level signal enters into AND circuit U1 through the common port in resistance R 4 and resistance R 5 behind resistance R 4, resistance R 5 dividing potential drops and the C1 capacitor filtering after process rectifier bridge D1 rectification; The electric current that current transformer CT2 induces produces the B end that a stable high level signal enters into AND circuit U1 through the common port in resistance R 6 and resistance R 7 behind resistance R 6, resistance R 7 dividing potential drops and the C2 capacitor filtering after process rectifier bridge D2 rectification; The electric current that current transformer CT3 induces produces the A end that a stable high level signal enters into AND circuit U2 through the common port in resistance R 8 and resistance R 9 behind resistance R 8, resistance R 9 dividing potential drops and the C3 capacitor filtering after process rectifier bridge D3 rectification; According to AND circuit logical operation rule, the Y of AND circuit U1 end is exported high level signal, and enters into the B end of AND circuit U2, the Y end output high level signal of AND circuit U2, and this moment, electronic overload relay did not carry out open phase protection, and relay is failure to actuate.
Electric current as current transformer CT1 induction is 0; when current transformer CT2 summation current transformer CT3 is in normal operating conditions; current transformer CT1 induction produces the A end that a low level signal enters AND circuit U1; current transformer CT2 induction produces the B end that a high level signal enters AND circuit U1; according to the gate logic operation rule; the Y end of AND circuit U1 is exported a low level signal and is entered the B end of AND circuit U2; current transformer CT3 induction produces the A end that a high level signal enters AND circuit U2; according to the gate logic operation rule; low level signal of Y end output of AND circuit U2 enters single-chip microcomputer INT pin interface; this moment, electronic overload relay carried out open phase protection, the actuating of relay.
Electric current as current transformer CT2 induction is 0; when current transformer CT1 and CT3 are in normal operating conditions; current transformer CT1 induction produces the A end that a high level signal enters AND circuit U1; current transformer CT2 induction produces the B end that a low level signal enters AND circuit U1; according to the gate logic operation rule; the Y end of AND circuit U1 is exported a low level signal and is entered the B end of AND circuit U2; current transformer CT3 induction produces the A end that a high level signal enters AND circuit U2; according to the gate logic operation rule; low level signal of Y end output of AND circuit U2 enters single-chip microcomputer INT pin interface; this moment, electronic overload relay carried out open phase protection, the actuating of relay.
Electric current as current transformer CT3 induction is 0; when current transformer CT1 and CT2 are in normal operating conditions; current transformer CT1 induction produces the A end that a high level signal enters AND circuit U1; current transformer CT2 induction produces the B end that a high level signal enters AND circuit U1; according to the gate logic operation rule; the Y end of AND circuit U1 is exported a high level signal and is entered the B end of AND circuit U2; current transformer CT3 induction produces the A end that a low level signal enters AND circuit U2; according to the gate logic operation rule; low level signal of Y end output of AND circuit U2 enters single-chip microcomputer INT pin interface; this moment, electronic overload relay carried out open phase protection, the actuating of relay.
Claims (1)
1. reliable electronic overload relay of open phase protection, it includes an open-phase protection circuit, it is characterized in that: it includes described open-phase protection circuit, the INT pin interface of single-chip microcomputer, first, second, the 3rd instrument transformer (CT1, CT2, CT3) electric signal input end of output, first, second, the 3rd rectifier bridge (D1, D2, D3), first, two, three, four, five, six, seven, eight, nine resistance (R1, R2, R3, R4, R5, R6, R7, R8, R9), first, two, three, four, five, six electric capacity (C1, C2, C3, C4, C5, C6), the 4th, five, six diode (D4, D5, D6), voltage-stabiliser tube (D7), first, second AND circuit (the U1, U2); The electric signal input end of the output of described first, second, third instrument transformer (CT1, CT2, CT3) connects the ac input end of described first, second, third rectifier bridge (D1, D2, D3) respectively; Positive output end in the dc output end of described first, second, third rectifier bridge (D1, D2, D3) connects the positive pole of described the 4th, the 5th, the 6th diode (D4, D5, D6) respectively, negative output terminal connects the end of described first, second, third resistance (R1, R2, R3) respectively, another termination GND of described first, second, third resistance (R1, R2, R3); The negative electrode of described voltage-stabiliser tube (D7) meets negative pole and the VCC of described the 4th, the 5th, the 6th diode (D4, D5, D6), and the anode of described voltage-stabiliser tube (D7) meets GND; Described the 4th, the 5th, the 6th electric capacity (C4, C5, C6) is parallel to the two ends of described voltage-stabiliser tube (D7); The common port of described the 4th, the 5th resistance of the A termination of described first AND circuit (U1) (R4, R5), the positive pole of described the 4th diode of another termination of described the 4th resistance (R4) (D4), another termination GND of described the 5th resistance (R5), described first electric capacity (C1) is connected in parallel on the two ends of described the 5th resistance (R5); The common port of described the 6th, the 7th resistance of the B termination of described first AND circuit (U1) (R6, R7), the positive pole of described the 5th diode of another termination of described the 6th resistance (R6) (D5), another termination GND of described the 7th resistance (R7), described second electric capacity (C2) is connected in parallel on the two ends of described the 7th resistance (R7); The common port of described the 8th, the 9th resistance of the A termination of described second AND circuit (U2) (R8, R9), the positive pole of described the 6th diode of another termination of described the 8th resistance (R8) (D6), another termination GND of described the 9th resistance (R9), described the 3rd electric capacity (C3) is connected in parallel on the two ends of described the 9th resistance (R9); The Y end of described first AND circuit of the B termination of described second AND circuit (U2) (U1), the INT pin interface of the described single-chip microcomputer of Y termination of described second AND circuit (U2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101811733A CN103248002A (en) | 2013-05-16 | 2013-05-16 | Electronic-type overload relay with reliable phase-failure protection function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101811733A CN103248002A (en) | 2013-05-16 | 2013-05-16 | Electronic-type overload relay with reliable phase-failure protection function |
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| CN103248002A true CN103248002A (en) | 2013-08-14 |
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| CN2013101811733A Pending CN103248002A (en) | 2013-05-16 | 2013-05-16 | Electronic-type overload relay with reliable phase-failure protection function |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2225056Y (en) * | 1995-07-05 | 1996-04-17 | 宋学林 | Monitor for metering electric power |
| US6469629B1 (en) * | 1999-02-12 | 2002-10-22 | General Electric Company | Distributed logic in multiple protective relays |
| CN2629308Y (en) * | 2003-06-01 | 2004-07-28 | 天水二一三机床电器厂 | Electronic thermal relay |
| CN201515217U (en) * | 2009-08-07 | 2010-06-23 | 常熟开关制造有限公司(原常熟开关厂） | Overload relay control circuit |
| CN201813142U (en) * | 2010-10-13 | 2011-04-27 | 彭建国 | Full-electronic open-phase protection controller |
| CN203278208U (en) * | 2013-05-16 | 2013-11-06 | 天津市百利电气有限公司 | Electronic overload relay capable of improving phase loss protection reliability |
-
2013
- 2013-05-16 CN CN2013101811733A patent/CN103248002A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2225056Y (en) * | 1995-07-05 | 1996-04-17 | 宋学林 | Monitor for metering electric power |
| US6469629B1 (en) * | 1999-02-12 | 2002-10-22 | General Electric Company | Distributed logic in multiple protective relays |
| CN2629308Y (en) * | 2003-06-01 | 2004-07-28 | 天水二一三机床电器厂 | Electronic thermal relay |
| CN201515217U (en) * | 2009-08-07 | 2010-06-23 | 常熟开关制造有限公司(原常熟开关厂） | Overload relay control circuit |
| CN201813142U (en) * | 2010-10-13 | 2011-04-27 | 彭建国 | Full-electronic open-phase protection controller |
| CN203278208U (en) * | 2013-05-16 | 2013-11-06 | 天津市百利电气有限公司 | Electronic overload relay capable of improving phase loss protection reliability |
Non-Patent Citations (1)
| Title |
|---|
| 徐叔炎: "一种电子式电动机保护继电器设计方案", 《电气开关》 * |
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Application publication date: 20130814 |