CN102680766A - Three-phase voltage sampling circuit for control and protection switches - Google Patents
Three-phase voltage sampling circuit for control and protection switches Download PDFInfo
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- CN102680766A CN102680766A CN2012101374440A CN201210137444A CN102680766A CN 102680766 A CN102680766 A CN 102680766A CN 2012101374440 A CN2012101374440 A CN 2012101374440A CN 201210137444 A CN201210137444 A CN 201210137444A CN 102680766 A CN102680766 A CN 102680766A
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Abstract
The invention discloses a three-phase voltage sampling circuit for control and protection switches, which comprises a three-phase power supply circuit, a signal detection circuit, a signal amplification circuit and a singlechip for controlling a switch, a three-phase voltage protection function is added, a voltage transformer is adopted for detection, the voltage transformer can reliably isolate power supply from signals, and has extremely high safety, meanwhile, the sampling circuit has high anti-interference performance because of the inherent characteristics of the voltage transformer, the three-phase voltage sampling circuit can detect phase voltage and line voltage by means of different connection methods, i.e. star connection and delta connection, and the sampled signal is processed by operational amplifiers and then the singlechip. If the signal is normal, then the singlechip continues to process the signal; and if the signal is abnormal, then the singlechip sends an instruction to a protection-executing mechanism to provide protection for load equipment.
Description
Technical field
The present invention relates to a kind of voltage sampling circuit, relate in particular to a kind of three-phase voltage sample circuit that is used to control protection switch.
Background technology
At present; It all is that electric current through load circuit changes and realizes that traditional control protection switch detects for the fluctuation (comprising phase shortage) of supply voltage, adopts single-phase voltage or current sample, protects not comprehensive; Poor anti jamming capability; There are bigger uncertainty and temporal hysteresis quality, possibly therefore cause the misoperation of control protection switch or protection to lose efficacy, cause load equipment to damage.
Summary of the invention
The object of the present invention is to provide a kind of three-phase voltage sample circuit that is used to control protection switch; It adopts the three-phase voltage sample circuit; Has protection comprehensively; Strong and the high reliability features of antijamming capability, the control protection switch detects the problem that exists in the prior art to supply voltage to solve.
For reaching this purpose, the present invention adopts following technical scheme:
A kind of three-phase voltage sample circuit that is used to control protection switch; The single-chip microcomputer that it comprises three phase supply circuit, signal deteching circuit, signal amplification circuit and is used for CS; Wherein, Said signal deteching circuit comprises voltage transformer pt 1, PT2, PT3; The three phase supply circuit is incorporated at the two ends of the primary winding of said voltage transformer pt 1 series limiting resistor R2, R5 respectively into, and the secondary coil parallel connection sampling resistor R4 of voltage transformer pt 1 connects the input end of signal amplification circuit, through signal amplification circuit detection signal is amplified and delivers to single-chip microcomputer; The three phase supply circuit is incorporated at the two ends of said voltage transformer pt 2 primary windings series limiting resistor R9, R11 respectively into; The secondary coil of voltage transformer pt 2 connects the input end of signal amplification circuit, through signal amplification circuit detection signal is amplified and delivers to single-chip microcomputer, and the three phase supply circuit is incorporated at the two ends of said voltage transformer pt 3 primary windings series limiting resistor R15, R17 respectively into; The secondary coil of voltage transformer pt 3 connects the input end of signal amplification circuit, through signal amplification circuit detection signal is amplified and delivers to single-chip microcomputer.
Especially; Said signal amplification circuit comprises operational amplifier U1, U2, U3; The in-phase input end resistance in series R6 of said operational amplifier U1 is connected with the secondary coil of voltage transformer pt 1; Inverting input resistance in series R3 is connected with the secondary coil of voltage transformer pt 1; Resistance in series R1 between the inverting input of said operational amplifier U1 and the output terminal; The in-phase input end resistance in series R7 of said operational amplifier U1 inserts reference voltage, and the positive supply pin of said operational amplifier U1 is through filtering circuit connecting system power supply, and the in-phase input end resistance in series R12 of said operational amplifier U2 is connected with the secondary coil of voltage transformer pt 2; Inverting input resistance in series R10 is connected with the secondary coil of voltage transformer pt 2; Resistance in series R8 between the inverting input of said operational amplifier U2 and the output terminal, the in-phase input end resistance in series R13 of said operational amplifier U2 inserts reference voltage, and the in-phase input end resistance in series R18 of said operational amplifier U3 is connected with the secondary coil of voltage transformer pt 3; Inverting input resistance in series R16 is connected with the secondary coil of voltage transformer pt 3; Resistance in series R14 between the inverting input of said operational amplifier U3 and the output terminal, the in-phase input end resistance in series R19 of said operational amplifier U3 inserts reference voltage, and the output terminal of above-mentioned operational amplifier U1, U2, U3 connects single-chip microcomputer.
Especially, said filtering circuit comprises capacitor C 1, the C2 of two parallel connections, the anodal connected system power supply of said capacitor C 2.
Beneficial effect of the present invention does; The compared with prior art said three-phase voltage sample circuit that is used to control protection switch has increased the three-phase voltage defencive function newly, adopts voltage transformer (VT) to detect, and voltage transformer (VT) can be realized the reliable isolation of power supply and signal; Has high security; Simultaneously because the inherent characteristic of voltage transformer (VT) makes sample circuit have good anti-interference, through different methods of attachment: star connection and delta connection; Can realize the detection of phase voltage and line voltage, the signal that samples is delivered to the single-chip microcomputer computing after handling through operational amplifier.If signal is normal, then continue processing signals by single-chip microcomputer; If abnormal signal then sends instruction by single-chip microcomputer to protection topworks, for load equipment provides protection.
Description of drawings
Fig. 1 is a circuit block diagram of controlling the specific embodiment of the invention 1 being used to of providing the three-phase voltage sample circuit of protection switch;
Fig. 2 is the physical circuit figure that controls the specific embodiment of the invention 1 being used to of providing the three-phase voltage sample circuit of protection switch.
Embodiment
Further specify technical scheme of the present invention below in conjunction with accompanying drawing and through embodiment.
See also Fig. 1 and shown in Figure 2; In the present embodiment; A kind of three-phase voltage sample circuit that is used to control protection switch comprises three phase supply circuit 1, signal deteching circuit 2, signal amplification circuit 3 and is used for the single-chip microcomputer 4 of CS; Said signal deteching circuit 2 comprises voltage transformer pt 1, PT2, PT3; Three phase supply circuit 1 is incorporated at the two ends of the primary winding of said voltage transformer pt 1 series limiting resistor R2, R5 respectively into, and the secondary coil parallel connection sampling resistor R4 of voltage transformer pt 1 connects the input end of signal amplification circuit 3, amplifies through 3 pairs of detection signals of signal amplification circuit and delivers to single-chip microcomputer 4; Three phase supply circuit 1 is incorporated at the two ends of said voltage transformer pt 2 primary windings series limiting resistor R9, R11 respectively into; The secondary coil of voltage transformer pt 2 connects the input end of signal amplification circuit 3, amplifies through 3 pairs of detection signals of signal amplification circuit and delivers to single-chip microcomputer 4, and three phase supply circuit 1 is incorporated at the two ends of said voltage transformer pt 3 primary windings series limiting resistor R15, R17 respectively into; The secondary coil of voltage transformer pt 3 connects the input end of signal amplification circuit 3, amplifies through 3 pairs of detection signals of signal amplification circuit and delivers to single-chip microcomputer 4.
Said signal amplification circuit 3 comprises operational amplifier U1, U2, U3; The in-phase input end resistance in series R6 of said operational amplifier U1 is connected with the secondary coil of voltage transformer pt 1; Inverting input resistance in series R3 is connected with the secondary coil of voltage transformer pt 1; Resistance in series R1 between the inverting input of said operational amplifier U1 and the output terminal; The in-phase input end resistance in series R7 of said operational amplifier U1 inserts reference voltage; And the positive supply pin of said operational amplifier U1 passes through the capacitor C 1 of two parallel connections, the filtering circuit connecting system power supply that C2 forms, the anodal connected system power supply of said capacitor C 2, and the in-phase input end resistance in series R12 of said operational amplifier U2 is connected with the secondary coil of voltage transformer pt 2; Inverting input resistance in series R10 is connected with the secondary coil of voltage transformer pt 2; Resistance in series R8 between the inverting input of said operational amplifier U2 and the output terminal, the in-phase input end resistance in series R13 of said operational amplifier U2 inserts reference voltage, and the in-phase input end resistance in series R18 of said operational amplifier U3 is connected with the secondary coil of voltage transformer pt 3; Inverting input resistance in series R16 is connected with the secondary coil of voltage transformer pt 3; Resistance in series R14 between the inverting input of said operational amplifier U3 and the output terminal, the in-phase input end resistance in series R19 of said operational amplifier U3 inserts reference voltage, and the output terminal of above-mentioned operational amplifier U1, U2, U3 connects single-chip microcomputer 4.
The above-mentioned three-phase voltage sample circuit that is used to control protection switch as required can be through different primary side methods of attachment: star connection or delta connection; It in the present embodiment star connection; Can realize the detection of phase voltage and line voltage, the signal that samples is delivered to the single-chip microcomputer computing after handling through operational amplifier.If signal is normal, then continue processing signals by single-chip microcomputer; If abnormal signal then sends instruction by single-chip microcomputer to protection topworks, for load equipment provides protection.
Above embodiment has just set forth ultimate principle of the present invention and characteristic; The present invention is not limited by above-mentioned example; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various variations and change, and these variations and change all fall in the scope of the invention that requires protection.The present invention requires protection domain to be defined by appending claims and equivalent thereof.
Claims (3)
1. three-phase voltage sample circuit that is used to control protection switch; The single-chip microcomputer that it comprises three phase supply circuit, signal deteching circuit, signal amplification circuit and is used for CS; Wherein, Said signal deteching circuit comprises voltage transformer pt 1, PT2, PT3; The three phase supply circuit is incorporated at the two ends of the primary winding of said voltage transformer pt 1 series limiting resistor R2, R5 respectively into, and the secondary coil parallel connection sampling resistor R4 of voltage transformer pt 1 connects the input end of signal amplification circuit, through signal amplification circuit detection signal is amplified and delivers to single-chip microcomputer; The three phase supply circuit is incorporated at the two ends of said voltage transformer pt 2 primary windings series limiting resistor R9, R11 respectively into; The secondary coil of voltage transformer pt 2 connects the input end of signal amplification circuit, through signal amplification circuit detection signal is amplified and delivers to single-chip microcomputer, and the three phase supply circuit is incorporated at the two ends of said voltage transformer pt 3 primary windings series limiting resistor R15, R17 respectively into; The secondary coil of voltage transformer pt 3 connects the input end of signal amplification circuit, through signal amplification circuit detection signal is amplified and delivers to single-chip microcomputer.
2. the three-phase voltage sample circuit that is used to control protection switch according to claim 1; It is characterized in that; Said signal amplification circuit comprises operational amplifier U1, U2, U3; The in-phase input end resistance in series R6 of said operational amplifier U1 is connected with the secondary coil of voltage transformer pt 1; Inverting input resistance in series R3 is connected with the secondary coil of voltage transformer pt 1, resistance in series R1 between the inverting input of said operational amplifier U1 and the output terminal, and the in-phase input end resistance in series R7 of said operational amplifier U1 inserts reference voltage; And the positive supply pin of said operational amplifier U1 is through filtering circuit connecting system power supply; The in-phase input end resistance in series R12 of said operational amplifier U2 is connected with the secondary coil of voltage transformer pt 2, and inverting input resistance in series R10 is connected with the secondary coil of voltage transformer pt 2, resistance in series R8 between the inverting input of said operational amplifier U2 and the output terminal; The in-phase input end resistance in series R13 of said operational amplifier U2 inserts reference voltage; The in-phase input end resistance in series R18 of said operational amplifier U3 is connected with the secondary coil of voltage transformer pt 3, and inverting input resistance in series R16 is connected with the secondary coil of voltage transformer pt 3, resistance in series R14 between the inverting input of said operational amplifier U3 and the output terminal; The in-phase input end resistance in series R19 of said operational amplifier U3 inserts reference voltage, and the output terminal of above-mentioned operational amplifier U1, U2, U3 connects single-chip microcomputer.
3. the three-phase voltage sample circuit that is used to control protection switch according to claim 2 is characterized in that said filtering circuit comprises capacitor C 1, the C2 of two parallel connections, the anodal connected system power supply of said capacitor C 2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101374440A CN102680766A (en) | 2012-05-07 | 2012-05-07 | Three-phase voltage sampling circuit for control and protection switches |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101374440A CN102680766A (en) | 2012-05-07 | 2012-05-07 | Three-phase voltage sampling circuit for control and protection switches |
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| CN102680766A true CN102680766A (en) | 2012-09-19 |
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| CN2012101374440A Pending CN102680766A (en) | 2012-05-07 | 2012-05-07 | Three-phase voltage sampling circuit for control and protection switches |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048521A (en) * | 2012-12-31 | 2013-04-17 | 浙江雷顿电气科技有限公司 | Voltage detection device of automatic change-over switch |
| CN103091542A (en) * | 2012-12-31 | 2013-05-08 | 浙江雷顿电气科技有限公司 | Voltage detection circuit capable of automatically transferring switch |
| CN103346772A (en) * | 2013-06-17 | 2013-10-09 | 成都荣耀科技有限公司 | Electric level boosting circuit used for remote monitoring system of distribution transformer |
| CN105548885A (en) * | 2016-02-03 | 2016-05-04 | 无锡多普力科技有限公司 | Motor control and protection switch having three-phase voltage protection function |
| CN107132463A (en) * | 2017-06-09 | 2017-09-05 | 国网吉林省电力有限公司长春供电公司 | Secondary windings of PT short-circuit preventing device |
| CN108414818A (en) * | 2018-03-30 | 2018-08-17 | 核工业理化工程研究院 | A kind of Acquisition Circuit and frequency converter for measuring high-frequency ac voltage |
| CN108982959A (en) * | 2018-08-01 | 2018-12-11 | 上海金脉电子科技有限公司 | Motor control three-phase voltage sample circuit |
| CN110333384A (en) * | 2019-08-15 | 2019-10-15 | 杭州电子科技大学 | Three-phase alternating voltage high-precision quick detection circuit based on mutual inductor |
| CN111650427A (en) * | 2020-06-11 | 2020-09-11 | 山西潞安环保能源开发股份有限公司五阳煤矿 | Voltage and current sampling device and method for coal mine circuit |
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| CN201945681U (en) * | 2010-12-22 | 2011-08-24 | 上海市电力公司 | Online monitoring device for capacitor voltage transformer |
| CN202562994U (en) * | 2012-05-07 | 2012-11-28 | 无锡智卓电气有限公司 | Three-phase voltage sampling circuit used for control and protection switch |
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| JP2000171494A (en) * | 1998-12-03 | 2000-06-23 | Mitsubishi Electric Corp | Method and device for detecting current |
| CN2686188Y (en) * | 2003-12-31 | 2005-03-16 | Tcl国际电工(无锡)有限公司 | Isolation detector for double-power source changeover switch |
| CN200979866Y (en) * | 2006-12-06 | 2007-11-21 | 天津百利特精电气股份有限公司 | An intelligent release of a build-in voltage sensor |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048521A (en) * | 2012-12-31 | 2013-04-17 | 浙江雷顿电气科技有限公司 | Voltage detection device of automatic change-over switch |
| CN103091542A (en) * | 2012-12-31 | 2013-05-08 | 浙江雷顿电气科技有限公司 | Voltage detection circuit capable of automatically transferring switch |
| CN103346772A (en) * | 2013-06-17 | 2013-10-09 | 成都荣耀科技有限公司 | Electric level boosting circuit used for remote monitoring system of distribution transformer |
| CN105548885A (en) * | 2016-02-03 | 2016-05-04 | 无锡多普力科技有限公司 | Motor control and protection switch having three-phase voltage protection function |
| CN107132463A (en) * | 2017-06-09 | 2017-09-05 | 国网吉林省电力有限公司长春供电公司 | Secondary windings of PT short-circuit preventing device |
| CN107132463B (en) * | 2017-06-09 | 2023-06-23 | 国网吉林省电力有限公司长春供电公司 | Short circuit preventing device for secondary winding of voltage transformer |
| CN108414818A (en) * | 2018-03-30 | 2018-08-17 | 核工业理化工程研究院 | A kind of Acquisition Circuit and frequency converter for measuring high-frequency ac voltage |
| CN108982959A (en) * | 2018-08-01 | 2018-12-11 | 上海金脉电子科技有限公司 | Motor control three-phase voltage sample circuit |
| CN108982959B (en) * | 2018-08-01 | 2021-02-19 | 上海金脉电子科技有限公司 | Three-phase voltage sampling circuit for motor control |
| CN110333384A (en) * | 2019-08-15 | 2019-10-15 | 杭州电子科技大学 | Three-phase alternating voltage high-precision quick detection circuit based on mutual inductor |
| CN110333384B (en) * | 2019-08-15 | 2021-04-13 | 杭州电子科技大学 | Three-phase alternating current voltage high-precision rapid detection circuit based on mutual inductor |
| CN111650427A (en) * | 2020-06-11 | 2020-09-11 | 山西潞安环保能源开发股份有限公司五阳煤矿 | Voltage and current sampling device and method for coal mine circuit |
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Application publication date: 20120919 |