CN214703795U - Three-phase voltage phase sequence memory and alarm device - Google Patents
Three-phase voltage phase sequence memory and alarm device Download PDFInfo
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- CN214703795U CN214703795U CN202023095628.4U CN202023095628U CN214703795U CN 214703795 U CN214703795 U CN 214703795U CN 202023095628 U CN202023095628 U CN 202023095628U CN 214703795 U CN214703795 U CN 214703795U
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- 238000000819 phase cycle Methods 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a three-phase voltage phase sequence memory and alarm device, including differential circuit, first, second, third, fourth, fifth voltage comparator, 50VDC, working power supply, phase sequence relay, five input AND gate circuit and alarm, differential circuit's input is connectedU AThe output end of the first voltage comparator is connected with the anode of the fifth voltage comparator, the cathode of the fifth voltage comparator is grounded, and the input ends of the first voltage comparator are respectively connected with the anode of the fifth voltage comparatorU AAndU Cthe input ends of the second voltage comparators are respectively connectedU BAndU Ainput of a third voltage comparatorEnd is respectively connected withU AAnd a ground connection; the input terminals of the fourth voltage comparator are respectively connected withU AAnd a 50VDC connection. The utility model discloses a set up a plurality of comparators and differential circuit, according to the level principle that the phase sequence changes, obtained the voltage output that can represent three-phase voltage phase sequence to can realize three-phase voltage phase sequence memory and change and report to the police, moreover the utility model discloses a circuit is simple, dependable performance.
Description
Technical Field
The utility model relates to a three-phase voltage phase sequence memory technical field especially relates to a three-phase voltage phase sequence memory and alarm device.
Background
At present, an isolating switch, a transformer and the like are common primary equipment of a transformer substation, and an electric mechanism is generally adopted for switching on and off or gear adjustment operation. The motor is powered by three-phase voltage, and the forward rotation or the reverse rotation of the motor is realized by adjusting the phase sequence of the three-phase voltage, so that the opening and closing of the isolating switch and the lifting of a main transformer gear are realized through a connecting rod.
The three-phase power supply of the isolating switch is taken from an alternating current power supply screen cabinet of a main control room or a protection room of a transformer substation, and the service lives of primary equipment such as an alternating current and direct current system for the transformer substation and the isolating switch are inconsistent. When transforming or meeting other circumstances to the station with alternating current-direct current system, three-phase voltage phase sequence probably changes, will lead to the isolator of transformer substation to be unable to operate this moment, even damages operating device. In the prior art, a three-phase voltage phase sequence memory and alarm device is not provided, so that a correct phase sequence can be determined and memorized in a debugging stage before the isolating switch is put into operation, and the phase sequence of a power supply after the isolating switch is put into operation cannot be timely discovered and alarmed when being changed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a three-phase voltage phase sequence memory and alarm device can realize that isolator three-phase current phase sequence gathers, memory and reports to the police, and the circuit is simple, dependable performance.
The utility model adopts the technical proposal that:
a three-phase voltage phase sequence memory and alarm device comprises a differential circuit, a first voltage comparator, a second voltage comparator, a third voltage comparator, a fourth voltage comparator, a fifth voltage comparator, a 50VDC, a working power supply, a phase sequence relay, a five-input AND gate circuit and an alarm, wherein the input end of the differential circuit is connected with UA, the output end of the differential circuit is connected with the anode of the fifth voltage comparator, the cathode of the fifth voltage comparator is grounded, the input end of the first voltage comparator is respectively connected with UA and UC, the input end of the second voltage comparator is respectively connected with UB and UA, and the input end of the third voltage comparator is respectively connected with UA and ground; the input end of a fourth voltage comparator is respectively connected with UA and 50VDC, a working power supply respectively supplies power to the original elements, the output ends of the first, second, third, fourth and fifth voltage comparators are respectively connected with the input end of a five-input AND gate circuit, the output end of the five-input AND gate circuit is connected with the control input end of a phase sequence relay, the output end of the phase sequence relay controls the control input end of an alarm, and UA, UB and UC are respectively three-phase voltages of a three-phase motor power supply.
The phase sequence reset circuit comprises an alarm holding relay, a single-pole double-throw switch and a reset button, a first movable contact of the single-pole double-throw switch is connected with one end of a normally open contact of the phase sequence relay, a second movable contact of the single-pole double-throw switch is connected with one end of a normally open close point of the phase sequence relay, a fixed contact is sequentially connected with an alarm holding relay coil and the reset button in series, one end of the normally open contact of the alarm holding relay is connected with the other end of the normally open contact of the phase sequence relay and the other end of the normally open close point respectively, and the other end of the normally open contact is connected with the fixed contact.
The differentiating circuit adopts a chip LM 393.
The chip LM 393.
The first, second, third and fourth voltage comparator integrated chip can select chip LM339,
the four-input and gate chip is 74LS 21.
The utility model discloses a set up a plurality of comparators and differential circuit, according to the level principle that the phase sequence changes, realized obtaining the voltage output that can represent three-phase voltage phase sequence to can realize that three-phase voltage phase sequence memorizes and changes the warning, moreover the utility model discloses a circuit is simple, the stable performance is reliable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a positive sequence waveform diagram of the three-phase voltage of the present invention;
FIG. 3 is a waveform diagram of the utility model when the three-phase voltage is negative sequence;
fig. 4 shows a phase sequence reset circuit according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.
As shown in fig. 1, the utility model discloses a three-phase voltage phase sequence memory and alarm device, its characterized in that: the circuit comprises a differential circuit, a first voltage comparator, a second voltage comparator, a third voltage comparator, a fourth voltage comparator, a fifth voltage comparator, a 50VDC, a working power supply, a phase sequence relay, a five-input AND gate circuit and an alarm, wherein the input end of the differential circuit is connected with the input end of the working power supply, the phase sequence relay, the five-input AND gate circuit and the alarmU AThe output end of the first voltage comparator is connected with the anode of the fifth voltage comparator, the cathode of the fifth voltage comparator is grounded, and the input ends of the first voltage comparator are respectively connected with the anode of the fifth voltage comparatorU AAndU Cthe input ends of the second voltage comparators are respectively connectedU BAndU Athe input terminals of the third voltage comparator are respectively connected withU AAnd a ground connection; the input terminals of the fourth voltage comparator are respectively connected withU AAnd the working power supply is used for supplying power to the elements, the output ends of the first, second, third, fourth and fifth voltage comparators are respectively connected with the input ends of a five-input AND gate circuit (letter & ltSUB & gt in the figure), the output end of the five-input AND gate circuit is connected with the control input end of a phase sequence relay, and the output end of the phase sequence relay controls the control input end of the alarm, wherein the output end of the phase sequence relay controls the control input end of the alarm, the working power supply is used for supplying power to the elements, the output ends of the first, second, third, fourth and fifth voltage comparators are respectively connected with the input end of the five-input AND gate circuit, the output end of the five-input AND gate circuit is connected with the control input end of the phase sequence relay, and the output end of the phase sequence relay controls the control input end of the alarm, and the working power supply is connected with the 50VDCU A、U B、U CThe three-phase voltage of the three-phase motor power supply is respectively.
SaidU AThe voltage obtained after passing through the differential circuit is recorded asU A1The outputs of the first, second, third, fourth and fifth voltage comparators are denoted asV 1、V 2、V 3、V 4、V 5The output of the five-input AND circuit isV 6When simultaneously satisfyU A <U C(to obtainV 1）、U A>U B(to obtainV 2）、U A>0 (get)V 3）、U A<50 (obtaining)V 4）、U A1<0 (get)V 5) When the temperature of the water is higher than the set temperature,V 6high, otherwise low.
In a period of the three-phase power supply, the three-phase power supply can be divided into regions I to II, and the magnitude sequence of the three-phase voltage amplitude in each region is fixed and can be used as the basis for judging the phase sequence.
Since the voltage amplitude is about 155V when any two voltages are equal. No matter how the three-phase voltage is allowed to fluctuate, the reference phase zero-crossing point does not fluctuate. Therefore, only the vicinity of the zero-crossing point of the reference phase needs to be selected so as not to be affected by the voltage fluctuation.
As shown in fig. 2 and 3, the three-phase motor a-phase voltage is selected as the reference phase,U Athe voltage is obtained after passing through a differential circuitU A1From the differentiating circuit, it can be known that:i C= i R=C*(dU A/dt)=-U A1/R
thus, there are:U A1=-RC*(dU Aand/dt), wherein R is the resistance value of the resistor, C is the capacitance value of the capacitor, and i is the current value.
At the same time satisfyU A <U C(to obtainV 1）、U A>U B(to obtainV 2）、U A>0 (get)V 3）、U A<50 (obtaining)V 4）、U A1<0 (get)V 5) When the temperature of the water is higher than the set temperature,V 6high, otherwise low. As can be seen from FIGS. 2 and 3, each cycle exists only when the three-phase voltages are in positive sequenceV 6Is high, and therefore will beV 6The mark voltage as positive voltage phase sequence can realize the memory of phase sequence, and then according to the mark voltageV 6The change of the level can know whether the phase sequence changes, and then the alarm of the change of the phase sequence is realized.
In order to realize the technical scheme, the differential circuit adopts a chip LM 393. The chip LM393 is provided with two paths of comparator circuits. The first, second, third and fourth voltage comparator integrated chips can select a chip LM339, an idea comparison circuit is integrated on the chip LM339, and the four-input AND gate chip is 74LS 21. When in specific use, the selection can be reasonably carried out according to actual requirements.
When the device is in actual use, the three-phase voltage phase sequence memory and alarm device is installed inside a mechanism box of equipment such as an isolating switch or a transformer. In the debugging stage before the operation of the isolating switch, the specific steps for determining the correct phase sequence of the three-phase power supply are as follows: the isolating switch is provided with a closing position and a separating position, and when the isolating switch is debugged, the movable contact is manually shaken to the middle position, and at the moment, the moving contact is not closed or separated. Pressing a switch-on button, observing whether a moving contact of the isolating switch moves to a switch-on position, and if not, adjusting the phase sequence of the power supply; if the phase sequence is correct, after the manual shifting piece (namely the knife) is positioned, the phase sequence relay is provided with two nodes, one normally open node is a normally open contact, and the other normally closed node is a normally closed contact. If the phase sequence of the three-phase power supply is changed after the isolating switch is operated, the phase abnormity warning node is conducted, and acousto-optic warning or other forms of warning can be driven.
In actual use, as shown in fig. 4, the phase sequence reset circuit further includes a phase sequence reset circuit, the phase sequence reset circuit includes a warning hold relay, a single-pole double-throw switch and a reset button, a first movable contact of the single-pole double-throw switch is connected with one end of a normally open contact of the phase sequence relay, a second movable contact is connected with one end of a normally open close contact of the phase sequence relay, a stationary contact is sequentially connected with a warning hold relay coil and the reset switch in series, one end of the normally open contact of the warning hold relay is respectively connected with the other end of the normally open contact of the phase sequence relay and the other end of the normally open close contact, and the other end of the normally open contact is connected with the stationary contact.
After receiving the alarm, the maintainer presses the reset button after adjusting the phase sequence, the alarm is not given, if the alarm is still given, the phase sequence is continuously adjusted until the alarm is not given after the reset.
For example, the following steps are carried out: the correct wiring method of the power supply is determined by actually debugging the isolating switch of a certain transformer substation (assuming that the negative sequence is correct wiring). Then, a power supply is connected to a three-phase voltage phase memory and alarm device as shown in the figure, the voltages of the position 1 and the position 2 of the manual shifting piece are measured, at the moment, the position 2 is positively charged, and the manual shifting piece is shifted to the position 1.
In operation, if the voltage phase sequence changes, the power supply phase sequence is changed from a negative sequence to a positive sequence, the relay XXJ acts, the relay XXJ-1 is conducted, the position 1 of the manual shifting piece is positively charged, an alarm is given to keep the relay GJBJ acting, the normally open node GJBJJ-1 is conducted, and then the relay GJBJJ continuously acts through the normally open node to generate phase sequence abnormity alarm.
And after receiving the alarm, the maintainer adjusts the power connection. After adjustment, the phase sequence of the power supply is changed from positive sequence to negative sequence, the relay XXJ returns, and the normally open contact XXJ-1 is disconnected. After a maintainer presses a reset button, a relay GJBJ loop is reset after being disconnected, GJBJ-1 is disconnected, the position 1 of a manual shifting piece is uncharged, a phase sequence abnormal alarm is reset, and the maintenance work is completed.
In the description of the present invention, it should be noted that, for the orientation words, if there are terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation and positional relationship indicated are based on the orientation or positional relationship shown in the drawings, and only for the convenience of describing the present invention and simplifying the description, it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and not be construed as limiting the specific scope of the present invention.
It is noted that the terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles thereof. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the specific embodiments described herein, and may include more effective embodiments without departing from the scope of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (5)
1. A three-phase voltage phase sequence memory and alarm device is characterized in that: the circuit comprises a differential circuit, a first voltage comparator, a second voltage comparator, a third voltage comparator, a fourth voltage comparator, a fifth voltage comparator, a 50VDC, a working power supply, a phase sequence relay, a five-input AND gate circuit and an alarm, wherein the input end of the differential circuit is connected with the input end of the working power supply, the phase sequence relay, the five-input AND gate circuit and the alarmU AThe output end of the first voltage comparator is connected with the anode of the fifth voltage comparator, the cathode of the fifth voltage comparator is grounded, and the input ends of the first voltage comparator are respectively connected with the anode of the fifth voltage comparatorU AAndU Cthe input ends of the second voltage comparators are respectively connectedU BAndU Athe input terminals of the third voltage comparator are respectively connected withU AAnd a ground connection; the input terminals of the fourth voltage comparator are respectively connected withU AThe output ends of the first, second, third, fourth and fifth voltage comparators are respectively connected with the input end of a five-input AND gate circuit, the output end of the five-input AND gate circuit is connected with the control input end of a phase sequence relay, and the output end of the phase sequence relay controls the control input end of an alarm, wherein the working power supply is used for supplying power to all the elements, the output ends of the first, second, third, fourth and fifth voltage comparators are respectively connected with the input end of the five-input AND gate circuit, the output end of the five-input AND gate circuit is connected with the control input end of the phase sequence relay, and the output end of the phase sequence relay controls the control input end of the alarm, wherein the output end of the phase sequence relay controls the control input end of the alarm, and the output end of the phase sequence relay is connected with the output end of the phase sequence relayU A、U B、U CThe three-phase voltage of the three-phase motor power supply is respectively.
2. The three-phase voltage phase sequence memory and alarm device of claim 1, wherein: the phase sequence reset circuit comprises an alarm holding relay, a single-pole double-throw switch and a reset button, a first movable contact of the single-pole double-throw switch is connected with one end of a normally open contact of the phase sequence relay, a second movable contact of the single-pole double-throw switch is connected with one end of a normally open close point of the phase sequence relay, a fixed contact is sequentially connected with an alarm holding relay coil and the reset button in series, one end of the normally open contact of the alarm holding relay is connected with the other end of the normally open contact of the phase sequence relay and the other end of the normally open close point respectively, and the other end of the normally open contact is connected with the fixed contact.
3. The three-phase voltage phase sequence memory and alarm device of claim 1, wherein: the differentiating circuit adopts a chip LM 393.
4. The three-phase voltage phase sequence memory and alarm device of claim 3, wherein: the first, second, third and fourth voltage comparator integrated chips can be selected from a chip LM 339.
5. The three-phase voltage phase sequence memory and alarm device of claim 1, wherein: the five-input AND circuit is 74LS 21.
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| CN202023095628.4U CN214703795U (en) | 2020-12-21 | 2020-12-21 | Three-phase voltage phase sequence memory and alarm device |
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| CN202023095628.4U CN214703795U (en) | 2020-12-21 | 2020-12-21 | Three-phase voltage phase sequence memory and alarm device |
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| CN214703795U true CN214703795U (en) | 2021-11-12 |
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| CN202023095628.4U Active CN214703795U (en) | 2020-12-21 | 2020-12-21 | Three-phase voltage phase sequence memory and alarm device |
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