CN210536284U - Over-voltage and under-voltage protector for power supply - Google Patents
Over-voltage and under-voltage protector for power supply Download PDFInfo
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- CN210536284U CN210536284U CN201921692789.6U CN201921692789U CN210536284U CN 210536284 U CN210536284 U CN 210536284U CN 201921692789 U CN201921692789 U CN 201921692789U CN 210536284 U CN210536284 U CN 210536284U
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Abstract
The utility model relates to an under-voltage protection ware is crossed to power, including sampling module, AC/DC module, the module is differentiateed to the analog to digital conversion module, crosses under-voltage, and A pilot lamp, B pilot lamp, C pilot lamp, total pilot lamp, relay contact module. The utility model has the advantages that: the protector is designed to be supplied with power in double paths, and if an external power supply is out of phase or a transformer of the protector fails, the protector can still make normal judgment; the three-phase power line voltage value can be respectively displayed by adopting a powerful microprocessor, particularly adopting an alternating current sampling technology, wherein the voltage measurement precision is +/-0.5 percent, the three-phase power line voltage value is equivalent to the function of a three-phase voltmeter, and the three-phase voltmeter has the functions of three-phase voltage display, overvoltage protection, undervoltage protection, open-phase protection (open-phase protection), three-phase voltage unbalance protection, phase sequence protection and audible and visual alarm. By adopting a unique three-phase power supply technology, the normal work of protection, alarm and display functions can be ensured even under the condition of extremely low voltage and even phase loss.
Description
Technical Field
The utility model relates to an under-voltage protection ware is crossed to power.
Background
The railway signal intelligent power supply system provides a safe and reliable power distribution power supply system for railway station signal equipment, the input of the system is direct input of a power grid, and due to the fact that the input power supply of the power grid is unstable, in order to guarantee reliable work of the railway signal power supply system, power supply voltage input by an external power grid needs to be checked, and reliable operation of the railway signal power supply system is guaranteed.
The abnormal conditions of important parameters (voltage, phase sequence, phase loss and phase balance) in the three-phase power supply system can damage the safe and reliable operation of a power supply system and equipment, reduce the effectiveness of machine equipment and the system, and reduce the maintenance cost and the maintenance time caused by the faults of the three-phase system.
The insulation of the motor is mainly realized by insulating materials, and the insulation dimension is limited by geometric space. When the voltage applied to the motor is too high, insulation breakdown is easily caused, and an accident is caused. When the voltage is too low, the output torque of the motor is reduced by a factor of square, and the motor may be locked, overheated, or even burned. Therefore, the range of the working voltage of the motor is narrow, and overvoltage protection and undervoltage protection must be added.
And through the overvoltage and undervoltage protector, the voltage exceeds the rated voltage, the protector cuts off the low-voltage power supply, and the circuit board is directly protected. The under-voltage protector plays a protective role at this moment. When the overvoltage occurs to the power supply line, the protector can rapidly and safely cut off the circuit under continuous high-voltage impact, and the accident caused by sending abnormal voltage into the terminal electrical appliance is avoided. When the voltage recovers to a normal value, the protector automatically switches on the circuit within a specified time, and the normal operation of the terminal electric appliance is ensured under the unattended condition.
SUMMERY OF THE UTILITY MODEL
The utility model aims to avoid the weak point among the above-mentioned background art and the under-voltage protector is crossed to the power that provides, this system is to under the field application environment, can make machine equipment and system obtain maximum protection, in time sends alarm signal to abnormal conditions, makes control system can give appropriate processing before machine equipment suffers bigger damage.
The utility model provides a power crosses under-voltage protection ware makes machine equipment and system obtain maximum protection, and under-voltage protection ware is crossed to the power of the validity of improvement machine, equipment and system. The fault detection circuit is mainly used for detecting various faults of industrial three-phase 100V, 220V, 380V (400V), 440V (460V), 660V and the like at the voltage levels of alternating current 50/60Hz and rated voltage below 660V, provides relay protection for overhigh voltage, overlow voltage, phase failure, phase dislocation (reverse phase sequence), three-phase voltage unbalance and the like of a three-phase input power supply, can be widely applied to power distribution cabinets, distribution boxes, electric control boxes, power electronic devices, telecommunication machine room power supplies and the like, and is an indispensable protection product for maintaining normal working voltage of equipment in industrial equipment operation.
The utility model discloses a realize like this, an under-voltage protection ware is crossed to power, including sampling module, AC/DC module, the under-voltage judgement module is crossed to the analog to digital conversion module, and A pilot lamp, B pilot lamp, C pilot lamp, total pilot lamp, relay contact module, total instruction output module, wherein cross the under-voltage judgement module and mainly include analog to digital conversion, digital processing, excessive pressure judgement, under-voltage judgement.
Compared with the background art, the utility model, have following advantage:
1. the protector is designed to be supplied with power in double paths, and if an external power supply is out of phase or a transformer of the protector fails, the protector can still make normal judgment;
2. the voltage measuring precision is +/-0.5% by adopting a powerful microprocessor, particularly an alternating current sampling technology, the voltage values of the three-phase power supply lines can be respectively displayed, and the function is equivalent to that of a three-phase voltmeter.
3. The three-phase voltage display, overvoltage protection, undervoltage protection, open-phase protection (open-phase protection), three-phase voltage unbalance protection, phase sequence protection (phase error protection) and acousto-optic alarm are integrated.
4. By adopting a unique three-phase power supply technology, the normal work of the functions of protection, alarm and display can be ensured even under the condition of extremely low voltage and even under the condition of phase loss.
Drawings
Fig. 1 is a schematic block diagram of the present invention.
Fig. 2 is an indicator light diagram of the present invention.
Detailed Description
As fig. 1, is the utility model discloses the functional block diagram, including sampling module, AC/DC module, cross undervoltage and differentiate module, A pilot lamp, B pilot lamp, C pilot lamp, total pilot lamp, relay contact module, total instruction output module. The overvoltage and undervoltage judging module mainly comprises analog-to-digital conversion, digital processing, overvoltage judging and undervoltage judging. The three input ends of A3, B11 and C21 are respectively connected with a sampling module, the sampling module is respectively connected with an AC/DC module, the AC/DC module is connected with an over-voltage and under-voltage judging module, the over-voltage and under-voltage judging module is respectively connected with an A indicator light, a B indicator light, a C indicator light and a general indicator light, and the over-voltage and under-voltage judging module is connected with a relay contact module; the relay contact module comprises an overvoltage monitoring key, an undervoltage monitoring key and an exit key; the over-voltage and under-voltage judging module is connected with the total indication output module, and the total indication output module is connected with the working, alarming and ground wires.
The sampling module enables the three-phase power to be reduced to a sampling voltage (the proportion is 300V/2.5V) according to the proportion, and the reference voltage range of the main control chip is met.
The AC/DC module adopts an ADC module integrated in an Atmega8a chip as an overvoltage and undervoltage phase sequence protector, the conversion precision is 10 bits, and the reference voltage is 2.5V. The voltage is converted into digital quantity by proportion and then is compared with a voltage value set by a user, so that the actions of the relay and the indicator light are controlled.
And the over-voltage and under-voltage judging module compares the acquired voltage value with a voltage value set by a user. An overvoltage adjusting mode: alarm voltage: 263V ± 2V, recovery voltage: 255V +/-2V; the undervoltage adjustment mode: alarm voltage: 167V ± 2V, recovery voltage: 175V + -2V.
And the relay contact module is controlled by the switch to monitor the over voltage and the under voltage.
When the two paths of input power supplies of the power supply screen are abnormally and continuously switched, the quit key T is pressed to check the fault reason.
As fig. 2, is the utility model discloses the pilot lamp picture, including A pilot lamp, B pilot lamp, C pilot lamp, withdraw from key, relay 1, relay 2, transformer 1, transformer 2, A pilot lamp, B pilot lamp, C pilot lamp are connected with relay 1, relay 2 respectively, and the other end is connected with transformer 1, transformer 2.
The working power supply adopts double-circuit power supply and is respectively taken from the phase A and the phase B in three-phase voltage, so that the protection board can still normally work when one-phase voltage fails (if the phase is short), and the reliability is improved.
The utility model discloses operational environment temperature: 0-50 ℃, air humidity: (90% 25 ℃ C.)
The utility model discloses electric wire netting voltage and frequency: 150V to 280V, 50Hz plus or minus 2 Hz. Three-phase four-wire system input;
the utility model discloses the initial time delay monitoring time of circular telegram can set for the scope: 1S-40S, and the model is set to be 3S.
The overvoltage and undervoltage judging module adopts an AC250V10A main relay and an AC250V5A auxiliary relay, the overvoltage and undervoltage actions share the AC250V10A main relay, and the other group of AC250V5A auxiliary relays are used as spare contacts.
The overvoltage and undervoltage judging module has two overvoltage adjusting modes: one is alarm voltage: 263V ± 2V another is the recovery voltage: 255V +/-2V;
the undervoltage adjusting mode of the overvoltage and undervoltage judging module is as follows: (1) alarm voltage: 167V ± 2V (2) recovery voltage: 175V +/-2V;
the four indicator lights are: a pilot lamp, B pilot lamp, C pilot lamp, total pilot lamp: the voltage of the total indicator lamp is green when normal, red when overvoltage or undervoltage, green when the voltage of the A, B, C phase indicator lamp is normal, red when overvoltage, and orange when undervoltage.
The utility model discloses all protect function all can select to Open (ON) or close (OFF) to can set up action threshold value and action time, convenience of customers adjusts according to actual need is nimble. Viewing and modification of the set parameters can also be performed during normal operation.
The utility model adopts a special ultra-large, wide temperature and high definition Chinese liquid crystal display screen, and displays the three-phase power line voltage value during normal work; when the fault occurs, the fault reason is directly displayed in Chinese, and the fault of which phase and the voltage value during the fault can be simultaneously displayed, so that the fault reason and the position can be conveniently and quickly determined.
The utility model discloses nevertheless not arriving the dropout time when detecting the fault condition, fault indicator is long bright, and the scintillation is shaded, and fault indicator scintillation behind the tripping operation is shaded for a long time bright, and buzzer sends intermittent alarm sound simultaneously.
The utility model discloses a nonvolatile storage technique takes place excessive pressure, under-voltage, lack the looks, unbalanced, record trouble when the contrary phase sequence trouble, even this product cuts off the power supply completely also can remember fault information, makes things convenient for the trouble inquiry. The method is beneficial to analyzing the fault reason after the accident and is convenient for removing the fault.
The utility model discloses a two kinds of reset mode: manual reset of phase sequence and open phase faults; the unbalanced, overvoltage and undervoltage faults are automatically reset, and the reset key can be pressed to manually reset. And after power failure, the device has a fault latch function.
The utility model discloses a theory of operation:
three paths of input signals are sampled, converted into direct current signals corresponding to the input signals through alternating current/direct current conversion, the direct current signals are converted into digital quantity through analog-to-digital conversion, overvoltage and undervoltage discrimination is carried out through a microprocessor after automatic calibration is carried out, one path of processing result is sent to a corresponding indicator lamp, the other path of processing result controls a relay to act, a D is set as a main indicator lamp, and meanwhile, corresponding indicator lamps are also respectively arranged on each path of A, B and C for displaying the working state of the path.
The circuit detects the change of three routes line voltage simultaneously, when the voltage is normal: the main relay is in a falling state, the auxiliary relay is in an excitation (suction) state, the main relay 41 and the auxiliary relay 42 are conducted, the main indicator light D is in a green state, and the corresponding indicator lights of all paths are also in a green state. When one or more of the voltage is detected to exceed 263V, the main relay sucks the auxiliary relay to fall down and stop excitation, the overvoltage signals 41 and 43 are output to be conducted, meanwhile, the main indicator lamp D emits red light, and the indicator lamp corresponding to the phase correspondingly emits red light. When the three-way voltage is lower than 255V, the main relay falls down and the auxiliary relay is sucked up and restored to be in the excitation states 41 and 42, the main indicator light D is turned to be green, and the corresponding three-phase indicator lights are also turned to be green. When one phase or several phases of voltage is lower than 167V, the main relay sucks the auxiliary relay to fall down and stop excitation, the output undervoltage signals 61 and 63 are conducted, the general indicator lamp D emits red light, and the indicator lamp corresponding to the phase emits orange light. When the three-phase voltage is higher than 175V, the main relay falls down and the auxiliary relay is sucked up and restored to the excitation states 61 and 62 to be conducted, the main indicator light D is restored to green, and the three corresponding indicator lights are also restored to green accordingly.
For the guarantee power supply safety, cross the automatic straight function of turning of undervoltage watch-dog addding, the concrete performance is: under the normal condition (> 190V) of an external power supply, if a protector possibly makes undervoltage misjudgment action due to the fault of a self component (except for a large-scale integrated circuit), a main relay sucks up, an auxiliary relay falls down, and an alarm signal is output. The protector monitors that the external power supply condition is normal after 3 seconds, when the external power supply condition is a self problem, the main electric appliance can be recovered to fall, the power supply of the circuit is converted into a direct connection state to be used as a standby power supply which can be normally used, but the auxiliary relay still keeps a falling alarm state, and the fault indicator lamp continues to keep a fault indication state and is used for prompting that the protector needs to be maintained.
The present invention is not limited to the above preferred embodiments, and any other products in various forms can be obtained by the teaching of the present invention, but any changes in the shape or structure thereof, and all the technical solutions same or similar to the present invention, all fall within the protection scope of the present invention.
Claims (5)
1. The utility model provides an under-voltage protector is crossed to power, includes sampling module, AC/DC module, crosses under-voltage judgement module, A pilot lamp, B pilot lamp, C pilot lamp, total pilot lamp, relay contact module, total instruction output module, its characterized in that: the input ends of the three paths A (3), B (11) and C (21) are respectively connected with a sampling module, the sampling module is respectively connected with an AC/DC module, the AC/DC module is connected with an over-voltage and under-voltage judging module, the over-voltage and under-voltage judging module is respectively connected with an indicator lamp A, an indicator lamp B, an indicator lamp C and a main indicator lamp, and the over-voltage and under-voltage judging module is connected with a relay contact module; the relay contact module comprises an overvoltage monitoring key, an undervoltage monitoring key and an exit key; the over-voltage and under-voltage judging module is connected with the total indication output module, and the total indication output module is connected with the working, alarming and ground wires.
2. The under-voltage and over-voltage protector of claim 1, wherein: the overvoltage and undervoltage judging module adopts an AC250V10A main relay and an AC250V5A auxiliary relay, the overvoltage and undervoltage actions share the AC250V10A main relay, and the other group of AC250V5A auxiliary relays are used as spare contacts.
3. The under-voltage and over-voltage protector of claim 1, wherein: the AC/DC module of the over-voltage and under-voltage phase sequence protector adopts an ADC module integrated in an Atmega8a chip, the conversion precision is 10 bits, the reference voltage is 2.5V, the reference voltage is converted into digital quantity through proportion, and the digital quantity is compared with a voltage value set by a user, so that the actions of a relay and an indicator lamp are controlled.
4. The under-voltage and over-voltage protector of claim 1, wherein: the overvoltage and undervoltage judging module compares the collected voltage value with a voltage value set by a user, and the overvoltage and undervoltage adjusting mode is as follows: alarm voltage: 263V ± 2V, recovery voltage: 255V +/-2V; the undervoltage adjustment mode: alarm voltage: 167V ± 2V, recovery voltage: 175V + -2V.
5. The under-voltage and over-voltage protector of claim 1, wherein: two reset modes are adopted: manual reset of phase sequence and open phase faults; the fault of unbalance and overvoltage and undervoltage can be automatically reset, and the fault can be manually reset by pressing a reset key, and the fault latch function is realized after the power is cut off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921692789.6U CN210536284U (en) | 2019-10-11 | 2019-10-11 | Over-voltage and under-voltage protector for power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921692789.6U CN210536284U (en) | 2019-10-11 | 2019-10-11 | Over-voltage and under-voltage protector for power supply |
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| CN210536284U true CN210536284U (en) | 2020-05-15 |
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| CN201921692789.6U Active CN210536284U (en) | 2019-10-11 | 2019-10-11 | Over-voltage and under-voltage protector for power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111834978A (en) * | 2020-06-30 | 2020-10-27 | 国网上海市电力公司 | Fault display method for overvoltage/undervoltage open-phase protector |
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2019
- 2019-10-11 CN CN201921692789.6U patent/CN210536284U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111834978A (en) * | 2020-06-30 | 2020-10-27 | 国网上海市电力公司 | Fault display method for overvoltage/undervoltage open-phase protector |
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