CN2182481Y - Phase-sequence display protector for phase failure and phase error - Google Patents
Phase-sequence display protector for phase failure and phase error Download PDFInfo
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- CN2182481Y CN2182481Y CN 94204097 CN94204097U CN2182481Y CN 2182481 Y CN2182481 Y CN 2182481Y CN 94204097 CN94204097 CN 94204097 CN 94204097 U CN94204097 U CN 94204097U CN 2182481 Y CN2182481 Y CN 2182481Y
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Abstract
The utility model belongs to a phase-sequence display protector for phase failure and phase error, which comprises a DC power supply circuit, a reversible counter, a BCD decoder, a phase sequence display, a relay, a buzzer, a potential isolating circuit, a phase sequence identification circuit and a drive circuit. The phase-sequence display protector for phase failure and phase error uses the potential isolating circuit to convert the power frequency three-phase sinusoidal wave power supply into three low-voltage square wave pulse signals with the phase difference of 120 DEG for providing phase-sequence identification signals to the phase sequence identification circuit. At a positive phase sequence, signals output by a phase identification circuit enable the reversible counter to count in the forward direction and the BCD decoder to output pathwise signals which enable a phase-sequence display to display in the positive phase sequence; at an erroneous phase sequence, signals output by the phase identification circuit enable the reversible counter to count in the reverse direction and the BCD decoder to output reverse signals which enable the phase sequence display to display the erroneous phase sequence. The drive circuit can drive the relay to work when phase failure and phase error happen, which enables the buzzer to switch on a working power supply to send out alarming sounds.
Description
The utility model relates to a kind of power consumption equipment protector, particularly a kind of protector that can show power frequency three-phase electricity phase sequence misphase, the phase failure.
" phase sequence ", " phase failure " problem are two crux factors that concern power consumption equipment safety, normal operation in three-phase electrical power system.After after motor device installs and with power phase, fixing,, in the silicon-controlled conversion device, can cause triggering asynchronous as if the phase sequence change, the output waveform disorder if the phase sequence change can lead to a disaster.When phase failure situation occurring, can make burn-down of electric motor.Existing power consumption equipment protector has the phase failure, overcurrent, overvoltage, overheat protective function mostly, does not possess the function of phase sequence demonstration and fault-phase protection.
The purpose of this utility model provides a kind of misphase that shows phase sequence, phase failure protector.
For finishing above-mentioned purpose, the utility model comprises DC power supply circuit, forward-backward counter, BCD decoder, phase sequence displayer, relay and buzzer, also comprise: a electric potential isolating circuit with three photoelectrical couplers, line end and zero line side join the input of photoelectrical coupler mutually with three through dropping resistor respectively, its output joins with three inputs of phase sequence discriminator circuit respectively, and output also joins through the phase failure input of rectifier diode and drive circuit respectively.A phase sequence discriminator circuit, this circuit is made up of two d type flip flops, two NAND gate, two inverters and a frequency divider, and wherein two d type flip flops are in order to differentiate phase sequence, the reversed-phase output of two d type flip flops
Input D connects respectively, the clear terminal CLR of two d type flip flops also connects, the output Q of first d type flip flop is as falling counting end, the output Q of second d type flip flop is as rising counting end, counting end falls, rising counting end joins through the input of two diodes and frequency divider respectively, one input of the output of frequency divider and two NAND gate joins, the output of two NAND gate respectively with the forward clock end of forward-backward counter, reverse clock end is joined, the NAND gate output that joins with the reverse clock end of forward-backward counter also joins through the misphase input of an inverter and drive circuit, this circuit has three inputs, wherein two inputs are drawn by the clock end of two d type flip flops, and another input is drawn through the clear terminal CLR of an inverter by two d type flip flops.A phase failure end and the drive circuit that the electric potential isolating circuit output joins, misphase end and phase sequence discriminator circuit join, this drive circuit drive relay work after receiving the phase failure, misphase signal, make buzzer send alarm signal.
The utility model can effectively be protected middle-size and small-size three phase electric machine, and its technique effect is: rotary speed when phase sequence shows: 5 revolutions per seconds; Misphase operate time＜100ms; Phase failure action time＜10ms; Output contact two is to (one often open, one normally closed).
Fig. 1 is a circuit diagram of the present utility model.
Fig. 2 is the schematic diagram of electric potential isolating circuit.
Fig. 3 is the schematic diagram of phase sequence discriminator circuit.
The oscillogram of d type flip flop each point when Fig. 4 is positive phase sequence.
The oscillogram of d type flip flop each point when Fig. 5 is negative-phase sequence.
In the drawings, A, B, C are power frequency three-phase line ends, and OU is a zero line side, and CK, CB are two pairs of output contacts, can join with external circuit such as warning circuit, contactor circuit.
Electric potential isolating circuit is by three photoelectrical coupler U6, U7, U8, diode D1-D2, D9-D11, light-emitting diode L11, L12, L13, resistance R 1-R6, R18-R20 forms, three-phase line end A, B, C and zero line side OU be respectively through dropping resistor R1, R18, R2, R19, and the input of R3, R20 and photoelectrical coupler U8, U7, U6 joins, input at photoelectrical coupler is also distinguished sending and receiving optical diode L11-L13, in order to show the input state of three-phase electricity.Output a, the b of three photoelectrical couplers, c join with three inputs of phase sequence discriminator circuit respectively, and the phase failure end that output a, b, c also draw an output d and drive circuit through diode D1-D3 respectively joins.The function of potential isolation device is, first is 5 volts low-voltage with the power frequency supply voltage transitions, second changes sine wave signal into square-wave signal, the 3rd for drive circuit provides phase failure signal, and four-way is crossed the rectifier diode D9-D11 that joins with each phase line dropping resistor R1-R3 and provided working power for buzzer.When phase sequence was correct, output a, the b of three photoelectrical couplers, c output phase respectively differed 120 ° square-wave pulse signal successively, and output d is because the high potential of square-wave pulse signal stack output one about 5V of 120 ° of three phase phasic differences.When the phase failure, output d exports a square-wave pulse signal owing to lack one road square-wave pulse signal, and light-emitting diode L11 or L12 or L13 are not luminous simultaneously, to indicate a certain phase line phase failure.The phase sequence discriminator circuit is made up of double D trigger integrated package U2, four NAND gate integrated package U1, frequency divider U3, diode D4, D5.The reversed-phase output of two d type flip flop U2-1, U2-2
, input D connects respectively, clear terminal CLR also connects, the output Q of d type flip flop U2-1 is counting end down, the output Q of d type flip flop U2-2 is for rising counting end up, the output a of the photoelectrical coupler in the electric potential isolating circuit is connected with the clock end CLK of U2-1, output b is connected with the clock end CLK of U2-2, and output C joins through the clear terminal CLR of an inverter U1-4 and U2-1, U2-2.Rise counting end up through diode D5, falling counting end down joins through the input of diode D4 and frequency divider U3, the output of frequency divider U3 and two NAND gate U1-1, the input of U1-2 joins, another input of NAND gate U1-1 with fall counting end down and join, another input and the counting end up of NAND gate U1-2 join, the output of NAND gate U1-1 divides two-way, one tunnel misphase input through inverter U1-3 and drive circuit joins, the reverse clock end of another road and forward-backward counter is joined, and the forward clock end of the output of NAND gate U1-2 and forward-backward counter is joined.The function of phase sequence discriminator circuit is that when photoelectrical coupler was imported the square-wave pulse signal of positive phase sequence, rising counting end up output frequency was the square-wave pulse signal of 50HZ, falls counting end down and exports a low level.The pulse square wave signal that rises counting end up output is made 1/10 frequency division after the square-wave pulse signal driving forward-backward counter that frequency of NAND gate U1-2 output is 5HZ is made counting forward through frequency divider U3, fall the low level of counting end down output and give high level of the reverse clock end of forward-backward counter, give low level of misphase output of drive circuit simultaneously through NAND gate U1-3 through NAND gate U1-1.When photoelectrical coupler input inversion preface square-wave pulse signal, rise counting end up and export a low level, falling counting end down output frequency is the pulse signal of 50HZ, according to above-mentioned identical analysis as can be known, forward-backward counter is made counting in reverse, and the misphase input of drive circuit obtains square-wave pulse signal simultaneously.Below in conjunction with Fig. 3, Fig. 4, Fig. 5 to rising counting end up, falling the output waveform of counting end down under forward preface and two kinds of situations of negative-phase sequence and do to analyze.The signal phase of a, b, the input of c end differs 120 ° successively during the forward preface as can be seen from Figure 3, when the C end during for high level through the anti-phase clear terminal that triggers U2-1, U2-2 of inverter U1-4, make U2-1, U2-2 zero clearing, like this U2-1,
Output high level (5V), falling counting end down(is U2-1, Q) output low level, rising counting end up(is U2-2, Q end) also output low level, because the rising edge of a end square-wave pulse drops in the C end pulse high level zone (see figure 4) all the time so d type flip flop U2-1 can not trigger, U2-1,
End is always high level, U2-1, Q end (promptly falling counting end down) is always low level, and the rising edge of the square-wave pulse of b end input is in outside the C end pulse high level zone, when on the square-wave pulse during saltus step, U2-2 is triggered, the output Q(of d type flip flop U2-2 promptly rises counting end up) export high level (because when triggering, its input D is a high level), with regard to output frequency the square-wave pulse signal of 50HZ rising counting end up like this, fall counting end down output low level, thereby obtained waveform shown in Figure 4.The waveform of D trigger end each point in the time of can obtaining negative-phase sequence shown in Figure 5 according to same reason.
Forward-backward counter is made of reversible counting integrated package U4, the forward clock end is 4 pin of U4, and reverse clock end is 5 pin of U4, and 2,3,6,7 pin of U4 are the binary-coded decimal output, circulation output 0000 to 1001BCD sign indicating number during positive phase sequence, circulation output 1001 to 0000BCD sign indicating numbers during negative-phase sequence.
The BCD decoder is made of BCD decoding integration block U5, and the phase sequence displayer is made of ten light-emitting diode L1-L8, and the BCD decoder output is connected with ten light-emitting diodes respectively, and when positive phase sequence, ten light-emitting diodes are pressed L1, L2 ... L10 is luminous successively.When negative-phase sequence, ten light-emitting diodes are pressed L10, L9 ... L1 is luminous successively, to show the phase sequence mistake.
Driver is by transistor BG1, BG2, BG3, BG4, unijunction transistor BG5, but control code SCR, diode D7, D8, resistance R 7 is to R14, capacitor C 4, button N forms, wherein draw phase failure input by the base stage of triode BG2, the base stage of triode BG4 is drawn the misphase input, its operation principle is: when the phase failure, square-wave pulse signal of the input of BG2, low level zone at this square-wave pulse, BG2, BG3 ends, power supply gives capacitor C 4 chargings by resistance R 9, this charging level triggers unijunction transistor BG5, trigger impulse appears in the control utmost point in controllable silicon SCR, the SCR conducting, transistor BG1 ends, and relay Z discharges, the normally closed contact of relay is connected, and buzzer SP sends alarm sound.During misphase, NAND gate U1-3(sees Fig. 3) output 9 provides pulse signal for the base stage of BG4, and this pulse signal is extremely gone up through the control that diode D7 is added to controllable silicon SCR, the controllable silicon SCR conducting, triode BG1 ends, and relay Z discharges, and buzzer SP sends alarm sound.Dc power electric routing transformer T, bridge rectifier B1, filter capacitor C1-C3, model are 7805 regulator block U0 composition, and the working power of SV is provided for the utility model.
The integrated circuit that the utility model adopts is respectively:
U1————74LS00
U2————74LS74
U3————HCT4017
U4————74LS192
U5————74LS145
U6————TIL113
U7————TIL113
U8————TIL113。
Claims (1)
1, a kind of phase sequence demonstration, misphase, phase failure protector comprise DC power supply circuit, reversible counting, BCD decoder, phase sequence displayer, circuit breaker and ring device, it is characterized in that also comprising:
Electric potential isolating circuit with three photoelectrical couplers, line end and zero line side join the input of photoelectrical coupler mutually with three through dropping resistor respectively, its output joins with three inputs of phase sequence discriminator circuit respectively, and output also joins through the phase failure input of rectifier diode and drive circuit respectively;
A phase sequence discriminator circuit, this circuit is by two d type flip flops, two NAND gate, two inverters and a frequency divider are formed, wherein two d type flip flops are in order to differentiate phase sequence, the reversed-phase output Q of two d type flip flops, input D connects respectively, the clear terminal CLR of two d type flip flops also connects, the output Q of first d type flip flop is as falling counting end, the output Q of second d type flip flop is as rising counting end, counting end falls, rising counting end joins through the input of two diodes and frequency divider respectively, one input of the output of frequency divider and two NAND gate joins, the output of two NAND gate respectively with the forward clock end of forward-backward counter, reverse clock end is joined, the NAND gate output that joins with the reverse clock end of forward-backward counter also joins through the misphase input of an inverter and drive circuit, this circuit has three inputs, wherein two inputs are drawn by the clock end of two d type flip flops, another input is drawn through the clear terminal CLR of an inverter by two d type flip flops
A phase failure end and the drive circuit that the electric potential isolating circuit output joins, misphase end and phase sequence discriminator circuit join, this drive circuit drive relay work after receiving the phase failure, misphase signal, make buzzer send alarm signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94204097 CN2182481Y (en) | 1994-03-04 | 1994-03-04 | Phase-sequence display protector for phase failure and phase error |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94204097 CN2182481Y (en) | 1994-03-04 | 1994-03-04 | Phase-sequence display protector for phase failure and phase error |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2182481Y true CN2182481Y (en) | 1994-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94204097 Expired - Fee Related CN2182481Y (en) | 1994-03-04 | 1994-03-04 | Phase-sequence display protector for phase failure and phase error |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2182481Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595013A (en) * | 2013-11-20 | 2014-02-19 | 南通三信塑胶装备科技有限公司 | Power supply source fault-phase and default-phase protective circuit of corona processor |
| CN106093607A (en) * | 2016-06-14 | 2016-11-09 | 江苏科技大学 | The circuit of testing the phase sequence of a kind of brshless DC motor and detection method |
| CN106124873A (en) * | 2016-06-14 | 2016-11-16 | 江苏科技大学 | A kind of brshless DC motor three-phase windings circuit of testing the phase sequence and detection method |
| CN106125027A (en) * | 2016-06-14 | 2016-11-16 | 江苏科技大学 | The testing circuit of a kind of brshless DC motor Hall element and detection method |
| CN106253212A (en) * | 2016-08-24 | 2016-12-21 | 国网山东省电力公司单县供电公司 | A kind of lack zero, phase shortage, phase sequence mistake power-off protection apparatus |
| CN110412400A (en) * | 2019-08-30 | 2019-11-05 | 中国长江电力股份有限公司 | The fault judgment method and failure protecting device of PT broken string and PT three-phase backward |
| CN116430129A (en) * | 2023-06-15 | 2023-07-14 | 创辉科技有限公司 | Electrical safety detection system |
-
1994
- 1994-03-04 CN CN 94204097 patent/CN2182481Y/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595013B (en) * | 2013-11-20 | 2017-05-17 | 南通三信塑胶装备科技股份有限公司 | Power supply source fault-phase and default-phase protective circuit of corona processor |
| CN103595013A (en) * | 2013-11-20 | 2014-02-19 | 南通三信塑胶装备科技有限公司 | Power supply source fault-phase and default-phase protective circuit of corona processor |
| CN106125027B (en) * | 2016-06-14 | 2019-01-18 | 江苏科技大学 | A kind of detection circuit and detection method of brshless DC motor Hall sensor |
| CN106125027A (en) * | 2016-06-14 | 2016-11-16 | 江苏科技大学 | The testing circuit of a kind of brshless DC motor Hall element and detection method |
| CN106124873A (en) * | 2016-06-14 | 2016-11-16 | 江苏科技大学 | A kind of brshless DC motor three-phase windings circuit of testing the phase sequence and detection method |
| CN106124873B (en) * | 2016-06-14 | 2018-12-14 | 江苏科技大学 | A kind of brshless DC motor three-phase windings circuit of testing the phase sequence and detection method |
| CN106093607B (en) * | 2016-06-14 | 2019-01-18 | 江苏科技大学 | A kind of circuit of testing the phase sequence and detection method of brshless DC motor |
| CN106093607A (en) * | 2016-06-14 | 2016-11-09 | 江苏科技大学 | The circuit of testing the phase sequence of a kind of brshless DC motor and detection method |
| CN106253212A (en) * | 2016-08-24 | 2016-12-21 | 国网山东省电力公司单县供电公司 | A kind of lack zero, phase shortage, phase sequence mistake power-off protection apparatus |
| CN106253212B (en) * | 2016-08-24 | 2018-07-31 | 国网山东省电力公司单县供电公司 | One kind lacking zero, phase shortage, phase sequence mistake power-off protection apparatus |
| CN110412400A (en) * | 2019-08-30 | 2019-11-05 | 中国长江电力股份有限公司 | The fault judgment method and failure protecting device of PT broken string and PT three-phase backward |
| CN116430129A (en) * | 2023-06-15 | 2023-07-14 | 创辉科技有限公司 | Electrical safety detection system |
| CN116430129B (en) * | 2023-06-15 | 2023-09-08 | 创辉科技有限公司 | Electrical safety detection system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |