CN202602246U - Zero line deficiency alarming and protecting circuit of three-phase voltage stabilizer - Google Patents
Zero line deficiency alarming and protecting circuit of three-phase voltage stabilizer Download PDFInfo
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- CN202602246U CN202602246U CN 201220163381 CN201220163381U CN202602246U CN 202602246 U CN202602246 U CN 202602246U CN 201220163381 CN201220163381 CN 201220163381 CN 201220163381 U CN201220163381 U CN 201220163381U CN 202602246 U CN202602246 U CN 202602246U
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Abstract
The utility model relates to a zero line deficiency alarming and protecting circuit of a three-phase voltage stabilizer. A three-phase input zero line is connected to an input terminal inside the voltage stabilizer via a current transformer TA1, an internal working zero line is lead out from the terminal, a resistor R1 is in parallel connection to two ends of the current transformer TA1, one end of the resistor R1 is connected to a noninverting input terminal of an amplifier U1 via a resistor R2, the other end of the resistor R1 is connected to an inverting terminal of the amplifier U1 via a resistor R3, a current sampling signal after difference amplification, rectification and filtration is inputted to a noninverting input terminal of a comparator U2, a voltage reference is connected with an inverting input terminal of the comparator U2, an output terminal of the comparator U2 is connected with a current limiting resistor R8, the other end of the current limiting resistor R8 is connected with a base electrode of a triode Q1, and a collector electrode of the triode Q1 is connected with a coil of a relay K1. The alarming and protecting circuit of the utility model is simple, convenient, safe and reliable, which can realize alarming and protecting functions when the voltage stabilizer lacks the zero line.
Description
Technical field
The utility model relates to a kind of circuit, refers in particular to the circuit that can realize alarm and protection when a kind of three-phase pressurizer input lacks zero.
Background technology
The three-phase pressurizer is through electronic control circuit, adopts the carbon brush of driven by motor voltage regulator, changes the bucking voltage of compensation bag on the major loop, the realization voltage stabilizing.Existing three-phase pressurizer generally all is a three-phase four-wire system, adopts A.C. contactor as output protection, through the coil voltage of control A.C. contactor, realizes normal output or protection work.When appearance input lacked zero, three-phase divided line pressure regulator to wrap in the inner formation of pressurizer star connection, and inside forms a neutral point, though the scarce odd-job work of input occurs, the output AC contactor still can constitute the loop and adhesive work with any one through neutral point mutually.Again because the three-phase power load is uneven, input zero line loose contact or when opening circuit, occur wherein one mutually or two phase voltage moments raise; Not only can cause pressurizer itself to damage; Also can cause electrical appliance to damage, burn electrical appliance when serious, cause personal injury and direct economic loss.
Summary of the invention
The purpose of the utility model is the deficiency to existing pressurizer technology, can realize the circuit of alarm and protection when providing a kind of simple and convenient, safe and reliable three-phase pressurizer input to lack zero, realizes that the three-phase pressurizer lacks zero alarm and protection function.
For realizing above-mentioned purpose; The utility model is realized through following technical scheme: a kind of three-phase pressurizer lacks zero alarm and protection circuit; Three-phase input zero line is linked into the inner input terminal of pressurizer through a current transformer TA1, and the internal work zero line is drawn from this terminal, resistance R 1 of current transformer TA1 two ends parallel connection; Resistance R 1 two ends through resistance R 2 and resistance R 3 receive respectively amplifier U1 in the same way and reverse input end; Be input to the end in the same way of comparator U2 through the current sampling signal behind the difference amplification, rectification and filtering, the reverse input end of comparator U2 connects a reference voltage, the output termination current-limiting resistance R8 of comparator U2; The base stage of another termination triode Q1 of current-limiting resistance R8, the coil of the collector connecting relay K1 of triode Q1.
This three-phase pressurizer lacks in the zero alarm and protection circuit; One group of normally closed main contact J1 of relay K 1 connects sound and light alarm device; Another group is often opened on the secondary circuit that main contact J2 is connected on output AC contactor KM1, realizes that through the coil voltage of control relay K1 sound and light alarm cuts off output or normal output.When the input zero line normally inserts, on the input zero line, there is certain magnitude of current to pass through, then behind sample rate current instrument transformer TA1 parallel resistance R1, can produces certain 3n subharmonic voltage; After this harmonic voltage value was amplified through amplifier U1 difference, rectifying and wave-filtering obtained a stable direct current signal, and this sampled signal is greater than reference signal; U2 does comparison through comparator, then exports high level, triode Q1 saturation conduction; Relay K 1 adhesive, then sound and light alarm loop open circuit is not reported to the police; Output AC contactor KM1 circuit closed, operate as normal.When the input zero line did not normally insert, it was unsettled then to import zero line, does not then have electric current to pass through current transformer TA1, was zero at instrument transformer TA1 voltage signal; Amplifying through amplifier U1 difference, still is a low level signal behind the rectifying and wave-filtering, and this sampled signal is less than reference signal; U2 does comparison through comparator, output low level then, and triode Q1 ends; Relay K 1 is broken off, and the work of sound and light alarm circuit closed realizes sound and light alarm; Output AC contactor KM1 loop open circuit cuts off output voltage, realizes defencive function.
Description of drawings
Fig. 1 is the fundamental diagram of three-phase pressurizer.
Fig. 2 is the circuit block diagram that the three-phase pressurizer lacks zero alarm and protection.
Fig. 3 is the control circuit schematic diagram that the three-phase pressurizer lacks zero alarm and protection.
Fig. 4 is the warning circuit major loop that the three-phase pressurizer lacks zero alarm and protection circuit.
Fig. 5 is the protective circuit major loop that the three-phase pressurizer lacks zero alarm and protection circuit.
Embodiment
Referring to Fig. 1-Fig. 3; A kind of three-phase pressurizer lacks zero alarm and protection circuit; Three-phase input zero line is linked into the inner input terminal of pressurizer through a current transformer TA1, and the internal work zero line is drawn from this terminal, resistance R 1 of current transformer TA1 two ends parallel connection; Resistance R 1 two ends through resistance R 2 and resistance R 3 receive respectively amplifier U1 in the same way and reverse input end; Be input to the end in the same way of comparator U2 through the current sampling signal behind the difference amplification, rectification and filtering, the reverse input end of comparator U2 connects a reference voltage, the output termination current-limiting resistance R8 of comparator U2; The base stage of another termination triode Q1 of current-limiting resistance R8, the coil of the collector connecting relay K1 of triode Q1.
As shown in Figure 2, this three-phase pressurizer lacks zero alarm and protection circuit and comprises neutral line current sample circuit 1, sampled signal treatment circuit 2, comparison control circuit 3, sound light alarming circuit 4, protection actuating circuit 5.Wherein current sampling circuit 1 is the current transformer TA1 secondary current signal that induction obtains on the input zero line; Obtain a voltage signal after constituting the loop by resistance R 1; The output signal of current sampling circuit 1 does the difference amplification through sampled signal treatment circuit 2 and rectifying and wave-filtering is handled; The output signal of sampled signal treatment circuit 2 is input to comparison control circuit 3, does comparison with reference signal, comparison output signal guide sound optical alarm circuit 4 and protection actuating circuit 5.
As shown in Figure 3, in this execution mode, current transformer TA1 two ends parallel resistance R1 constitutes current sampling circuit 1.Resistance R 1 two ends connecting resistance R2 and resistance R 3 respectively are input to end in the same way and the backward end of amplifier U1, and resistance R of termination 5 is to mainboard ground in the same way for amplifier U1, and amplifier U1 exports resistance R 4 of termination and feeds back to backward end, constitutes a differential amplifier circuit.The positive pole of the output terminating diode D1 of amplifier U1 is realized rectification, and the negative pole of diode D1 connects capacitor C 1, constitutes filter circuit, and the sampled signal behind the rectifying and wave-filtering is stable direct current signal.This stable direct current signal is input to the end in the same way of comparator U2; The backward end connecting resistance R6 of comparator U2 and resistance R 7, motherboard power supply voltage obtains a reference signal through resistance R 6 and resistance R 7 dividing potential drops, is input to the backward end of comparator U2; The output termination current-limiting resistance R8 of comparator U2; Rear drive triode Q1, the coil of the grounded emitter of triode Q1, collector connecting relay K1, another termination motherboard power supply of the coil of relay K 1.
As shown in Figure 4, in this execution mode, the moving contact of 1 one groups of normally-closed contacts of relay K connects input A phase voltage, normally-closed contact indicator light HR taking alarm, another termination buzzer HB of alarm lamp HR, another termination input B phase voltage of buzzer HB.When the input zero line normally inserts, the coil electricity of relay K 1, the contact action, the normally-closed contact open circuit, alarm lamp HR does not work, and buzzer HB does not work.When the input zero line does not normally insert, the open coil of relay K 1, be failure to actuate in the contact, the normally-closed contact short circuit, phase voltage constitutes the loop through alarm lamp HR and buzzer HB, and alarm lamp HR lights, and buzzer HB pipes, and realizes lacking zero sound and light alarm.
As shown in Figure 5, in this execution mode, the moving contact of another group normally-closed contact of relay K 1 connects input A phase voltage, and normally opened contact connects an end of output AC contactor KM1 coil, another termination complete machine zero line of output AC contactor KM1 coil.The major loop of output AC contactor KM1 is connected between three-phase voltage stabilizing output and the actual output of complete machine.When the input zero line normally inserts, the coil electricity of relay K 1, the contact action, the normally opened contact short circuit, output AC contactor KM1 constitutes the loop between phase voltage and zero line, the adhesive of output AC contactor KM1 main contact, normal output.When the input zero line did not normally insert, the coil of relay K 1 did not have electricity, was failure to actuate in the contact, the normally opened contact open circuit, and output AC contactor KM1 coil does not have operating voltage, and its main contact breaks off, and realizes lacking zero protection.
Claims (8)
1. a three-phase pressurizer lacks zero alarm and protection circuit; It is characterized in that: three-phase input zero line is linked into the inner input terminal of pressurizer through a current transformer TA1; The internal work zero line is drawn from this terminal; Resistance R 1 of current transformer TA1 two ends parallel connections, resistance R 1 two ends through resistance R 2 and resistance R 3 receive respectively amplifier U1 in the same way and reverse input end, be input to the end in the same way of comparator U2 through the current sampling signal behind the difference amplification, rectification and filtering; The reverse input end of comparator U2 connects a reference voltage; The output termination current-limiting resistance R8 of comparator U2, the base stage of another termination triode Q1 of current-limiting resistance R8, the coil of the collector connecting relay K1 of triode Q1.
2. three-phase pressurizer according to claim 1 lacks zero alarm and protection circuit; It is characterized in that: described current transformer TA1 two ends parallel resistance R1 constitutes current sampling circuit (1); Current sampling circuit (1) is the current transformer TA1 secondary current signal that induction obtains on the input zero line; Obtain a voltage signal after constituting the loop by resistance R 1; The output signal of current sampling circuit (1) does the difference amplification through sampled signal treatment circuit (2) and rectifying and wave-filtering is handled; The output signal of sampled signal treatment circuit (2) is input to comparison control circuit (3), does comparison with reference signal, comparison output signal guide sound optical alarm circuit (4) and protection actuating circuit (5).
3. three-phase pressurizer according to claim 1 lacks zero alarm and protection circuit; It is characterized in that: described amplifier U1 resistance R of termination 5 in the same way arrives mainboard ground; Resistance R 4 of amplifier U1 output termination feeds back to backward end, constitutes a differential amplifier circuit.
4. three-phase pressurizer according to claim 1 lacks zero alarm and protection circuit; It is characterized in that: the positive pole of the output terminating diode D1 of amplifier U1; Realize rectification, the negative pole of diode D1 connects capacitor C 1, constitutes filter circuit; Sampled signal behind the rectifying and wave-filtering is stable direct current signal, and this stable direct current signal is input to the end in the same way of comparator U2.
5. three-phase pressurizer according to claim 1 lacks zero alarm and protection circuit; It is characterized in that: the backward end connecting resistance R6 of described comparator U2 and resistance R 7; Motherboard power supply voltage obtains a reference signal through resistance R 6 and resistance R 7 dividing potential drops, is input to the backward end of comparator U2.
6. three-phase pressurizer according to claim 1 lacks zero alarm and protection circuit, it is characterized in that: the grounded emitter of described triode Q1, another termination motherboard power supply of the coil of described relay K 1.
7. three-phase pressurizer according to claim 1 lacks zero alarm and protection circuit; It is characterized in that: the moving contact of 1 one groups of normally-closed contacts of described relay K connects input A phase voltage; Normally-closed contact indicator light HR taking alarm; Another termination buzzer HB of alarm lamp HR, another termination input B phase voltage of buzzer HB.
8. three-phase pressurizer according to claim 1 lacks zero alarm and protection circuit; It is characterized in that: the moving contact of another group normally-closed contact of described relay K 1 connects input A phase voltage; Normally opened contact connects an end of output AC contactor KM1 coil; Another termination complete machine zero line of output AC contactor KM1 coil, the major loop of output AC contactor KM1 are connected between three-phase voltage stabilizing output and the actual output of complete machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220163381 CN202602246U (en) | 2012-04-07 | 2012-04-07 | Zero line deficiency alarming and protecting circuit of three-phase voltage stabilizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220163381 CN202602246U (en) | 2012-04-07 | 2012-04-07 | Zero line deficiency alarming and protecting circuit of three-phase voltage stabilizer |
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| CN202602246U true CN202602246U (en) | 2012-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220163381 Expired - Fee Related CN202602246U (en) | 2012-04-07 | 2012-04-07 | Zero line deficiency alarming and protecting circuit of three-phase voltage stabilizer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684146A (en) * | 2012-04-07 | 2012-09-19 | 三科电器集团有限公司 | Zero-lacking alarm protective circuit of three-phase voltage stabilizer |
| CN106300228A (en) * | 2016-08-31 | 2017-01-04 | 杭州尚美电气有限公司 | A kind of circuit breaker system |
-
2012
- 2012-04-07 CN CN 201220163381 patent/CN202602246U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684146A (en) * | 2012-04-07 | 2012-09-19 | 三科电器集团有限公司 | Zero-lacking alarm protective circuit of three-phase voltage stabilizer |
| CN106300228A (en) * | 2016-08-31 | 2017-01-04 | 杭州尚美电气有限公司 | A kind of circuit breaker system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Zero-lacking alarm protective circuit of three-phase voltage stabilizer Effective date of registration: 20140924 Granted publication date: 20121212 Pledgee: Agricultural Bank of China, Limited by Share Ltd, Yueqing branch Pledgor: Sako Power Technology Corporation Registration number: 2014980000080 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121212 Termination date: 20150407 |
|
| EXPY | Termination of patent right or utility model |