CN204144930U - A kind of microprocessor relay and protection system of transmission line - Google Patents
A kind of microprocessor relay and protection system of transmission line Download PDFInfo
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- CN204144930U CN204144930U CN201420644955.6U CN201420644955U CN204144930U CN 204144930 U CN204144930 U CN 204144930U CN 201420644955 U CN201420644955 U CN 201420644955U CN 204144930 U CN204144930 U CN 204144930U
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- microprocessor
- transmission line
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- protection system
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Abstract
The utility model discloses a kind of microprocessor relay and protection system of transmission line; it is characterized in that: comprise voltage and form loop, low-pass filter circuit, data storage circuit, microprocessor and switching value output module; voltage formation loop, low-pass filter circuit, data storage circuit, microprocessor are connected successively; microprocessor input is connected with keyboard, and described output end of microprocessor is connected with display, switching value output module.The utility model forms by voltage the voltage fluctuation situation that loop gathers transmission line; and by low-pass filter circuit, data storage circuit, process preservation is carried out to fluctuation voltage signal; finally by the voltage signal after microprocessor analysis acquisition process; when signal fluctuation is too large there is transmission line fault time; Microprocessor S3C44B0X switching value output module cuts off power transmission line loop, protection transmission of electricity safety.It is reasonable in design, monitoring is accurate, protection reliability is good and cost is lower, efficiently solves the deficiencies in the prior art.
Description
Technical field
The utility model relates to electric power monitoring control technology field, especially relates to a kind of microprocessor relay and protection system of transmission line.
Background technology
Transmission of electricity is after boosting with the electric energy that generator sends by transformer, then realizes through control appliance access transmission lines such as circuit breakers.By version, transmission line is divided into overhead transmission line and cable line.The formation such as overhead transmission line route overhead line structures, wire, insulator, line hardware, bracing wire, pole and tower foundation, earthing device, is erected on ground.According to the character of conveying electric current, transmission of electricity is divided into ac transmission and direct current transportation.The eighties in 19th century first successfully achieves direct current transportation.But the voltage due to direct current transportation is difficult to continue to improve under technical conditions at that time, so that ability to transmit electricity and benefit are restricted.In 19 end of the centurys, direct current transportation is progressively by ac transmission is replaced.The success of ac transmission, has welcome the New Times of 20th century electrified society.
The basic process of transmission of electricity creates conditions electromagnetic energy is transmitted along the direction of transmission line.Multi-line power transmission ability is subject to the domination of the various rules of electromagnetic field and circuit.With ground potential (zero potential) as a reference point, line conductor is called transmission voltage under all needing to be in the high voltage applied by power supply.Under power transmission line is exposed to natural conditions, climate destroys, artificial destruction and homeostasis reliability effect comparatively large, there is many safety problems.
First be thunderbolt, thunderstorm season suffers torpedo plane meeting a lot.Circuit suffers thunderbolt to have three kinds of situations: one is be struck by lightning on line conductor, produces direct lightning strike overvoltage; Two is after thunderbolt lightning conducter, strikes back on power transmission line; Three is be struck by lightning near circuit or on shaft tower, and power transmission line produces induction overvoltage.No matter be direct lightning strike overvoltage or induction overvoltage, all make wire produces a large amount of electric charge, these electric charges are propagated with speed (300,000 kilometers per second) the guiding line both sides being bordering on light, and Here it is, and thunder and lightning carries out ripple.Direct lightning strike overvoltage, gently then causes line insulator to dodge and irons, thus cause circuit single-phase earthing or tripping operation, heavy then cause insulator to break, puncture, the accident such as broken string, cause the power failure of circuit long period.Thunder and lightning carries out ripple fair line road and invades transformer station, threatens the insulation of electric equipment, causes the accident such as Explosion of on Arrester, main transformer insulation damages, directly affects the safe operation of transformer station.
Next is icing, and in low temperature sleety weather, during cold weather, because humidity is high, a large amount of Moisture condensation causes icing in conductive line surfaces, easily causes the freezing disaster of electric power system.Protect the tension imbalance of bar both sides during icing, there will be the wire drop impact load that breaks and cause down bar; Cold can contraction met by the electric wire frozen, and wind causes concussion, and electric wire ruptures because being unequal to heavy burden sometimes, even if constantly wave overlong time, wire, tower bar, insulator and gold utensil etc. also can be made to be subject to imbalance and impact and fatigue damage.By icing, wave the transmission line caused and fall bar (tower), broken string and trip accident and can cause great infringement to the transmission line of electric power system, more can threaten safe and stable operation and the electric power system reliability of operation of electrical network.
Be finally outside destroy, the fault that outside destroy power circuit causes gets more and more, and situation is also more complicated, distributes wide.In mountain area, the fried stone that cuts into a mountain is easy to wound insulator, blow up wire; At the below burning crop of circuit process, flame and dense smoke easily cause line tripping; The large-scale crane of constructing in circuit protection zone, excavator touch disconnected wire sometimes, break tower bar etc.; Also some lawless person is subject to the electric power facilities such as stealing tower material, bracing wire that orders about of economic interests; And fishing, construction violating the regulations etc. under transmission line.
Based on above reason, the protection for power transmission line is particularly important, is mainly divided into main protection and backup protection at present, and main protection generally has two kinds of longitudinal difference protections and three-step charging.And mainly carrier current protection is adopted now in extra high voltage system.
Backup protection mainly contains distance protection, zero-sequenceprotection, direction protection etc.Voltage protection and current protection due to can not meet reliability and selectivity be not generally used alone now be generally the two with the use of.And various protection is all furnished with auto recloser.And protection has alternate and single-phase dividing.Double-circuit line then needs to consider direction in this way.The cooperation between each protection is then should be noted that when adjusting.Also to consider transmission line electric capacity, mutual inductance, with or without branched line.With branch's transformer, system operation mode, earthing mode, reclosing mode etc.Also have a bit importantly at the transmission line of 220KV and above system, due to electric pressure high fault mainly single phase ground fault, the electric current that sometimes may break down is less than the situation of load current.And comparatively large by the impact of various line parameter circuit value, the impact of various situation and parameter especially will be taken into full account when preparing protection.But do not have at present a kind of reasonable in design, monitoring accurately, protect reliable and lower-cost transmission line relaying scheme.
Utility model content
Technical problem to be solved in the utility model is for above-mentioned deficiency of the prior art; a kind of microprocessor relay and protection system of transmission line is provided; the utility model forms by voltage the voltage fluctuation situation that loop gathers transmission line; and by low-pass filter circuit, data storage circuit, process preservation is carried out to fluctuation voltage signal; finally by the voltage signal after microprocessor analysis acquisition process; when signal fluctuation is too large there is transmission line fault time; Microprocessor S3C44B0X switching value output module cuts off power transmission line loop, protection transmission of electricity safety.It is reasonable in design, monitoring is accurate, protection reliability is good and cost is lower, efficiently solves the deficiencies in the prior art.
For solving the problems of the technologies described above; the technical solution adopted in the utility model is: a kind of microprocessor relay and protection system of transmission line; it is characterized in that: comprise voltage and form loop, low-pass filter circuit, data storage circuit, microprocessor and switching value output module; described voltage formation loop, low-pass filter circuit, data storage circuit, microprocessor are connected successively; described microprocessor input is connected with keyboard, and described output end of microprocessor is connected with display, switching value output module.
The microprocessor relay and protection system of above-mentioned a kind of transmission line, is characterized in that: described voltage forms back routing transformer and connected electric resistance partial pressure type sample circuit composition.
The microprocessor relay and protection system of above-mentioned a kind of transmission line, is characterized in that: described microprocessor is the single-chip microcomputer of model C 8051F021.
The microprocessor relay and protection system of above-mentioned a kind of transmission line, is characterized in that: described low-pass filter circuit is RC low-pass filter circuit.
The microprocessor relay and protection system of above-mentioned a kind of transmission line, is characterized in that: described data storage circuit is the analog signal storage of model LF398.
The microprocessor relay and protection system of above-mentioned a kind of transmission line, is characterized in that: described display is LED display.
The microprocessor relay and protection system of above-mentioned a kind of transmission line, it is characterized in that: described switching value output module is by a PNP triode, a NPN triode, diode, light-emitting diode, the switching value output circuit of relay composition, wherein PNP triode base stage is connected with single-chip microcomputer signal output part by resistance, PNP triode collector electrode is connected with NPN transistor base by resistance, PNP triode collector electrode is also connected with NPN triode emitter-base bandgap grading by resistance, described NPN transistor collector connecting luminous diode, relay, parallel circuits unit one end of diode composition, described NPN triode emitter grounding, described PNP triode emitter-base bandgap grading connects 5V power supply, described light-emitting diode, relay, another termination 12V power supply of parallel circuits unit of diode composition.
The utility model compared with prior art has the following advantages:
The utility model is reasonable in design, monitoring is accurate, protection reliability is good and cost is lower, efficiently solves the deficiencies in the prior art.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is integrated circuit structured flowchart of the present utility model;
Fig. 2 is that voltage of the present utility model forms loop circuit schematic diagram;
Fig. 3 is low-pass filter circuit schematic diagram of the present utility model;
Fig. 4 is switching value output module circuit theory diagrams of the present utility model.
Embodiment
As shown in Figure 1; a kind of microprocessor relay and protection system of transmission line; it is characterized in that: comprise voltage and form loop 1, low-pass filter circuit 2, data storage circuit 3, microprocessor 4 and switching value output module 7; described voltage formation loop 1, low-pass filter circuit 2, data storage circuit 3, microprocessor 4 are connected successively; described microprocessor 4 input is connected with keyboard 5, and described microprocessor 4 output is connected with display 6, switching value output module 7.
As shown in Figure 2, in the present embodiment, described voltage forms loop 1 and is made up of transformer and connected electric resistance partial pressure type sample circuit.The range of the input pin of the AD transformation function carried due to microprocessor is 0 ~ 2.4V, and is the ac voltage signal of positive and negative 1.2V through the voltage that resistance produces from secondary CT, so will add a voltage modulate circuit.Series resistance R3=R4=1 kilo-ohm is utilized to carry out average dividing potential drop.
In the present embodiment, described microprocessor 4 is the single-chip microcomputer of model C 8051F021.
As shown in Figure 3, in the present embodiment, described low-pass filter circuit 2 is RC low-pass filter circuit.It has the advantage being easy to choice criteria resistance capacitance element.And circuit itself has, and logical low frequency capabilities is good, antijamming capability is extremely strong and structure forms simple feature.For meeting frequency not for the purpose of aliasing, when carrying out data information acquisition, we will ensure that sample frequency is higher than 2 times of signal frequency.Calculate according to this requirement, we to gather electric power system break down after voltage and current signal time, sample frequency will be brought up to and be greater than 4000Hz, because now the frequency of signal is greater than 2000Hz.This device is selected RC to realize.Such guarantee is when fundamental frequency works, and Microcomputer Protection principle is normally used, and samples to be unlikely to too high to the requirement of hardware in reliable and effective situation.
In the present embodiment, described data storage circuit 3 is the analog signal storage of model LF398.LF398 is in fact a kind of analog signal storage, and it, under digital command controls, makes switch on and off, sample and deposit input signal instantaneous value, usually forms the sample/hold circuit of high input impedance with two operational amplifiers.
In the present embodiment, described display 6 is LED display, whether normal for showing bus voltage parameter.
As shown in Figure 4, in the present embodiment, described switching value output module 7 is by a PNP triode, a NPN triode, diode, light-emitting diode, the switching value output circuit of relay composition, wherein PNP triode base stage is connected with single-chip microcomputer signal output part by resistance, PNP triode collector electrode is connected with NPN transistor base by resistance, PNP triode collector electrode is also connected with NPN triode emitter-base bandgap grading by resistance, described NPN transistor collector connecting luminous diode, relay, parallel circuits unit one end of diode composition, described NPN triode emitter grounding, described PNP triode emitter-base bandgap grading connects 5V power supply, described light-emitting diode, relay, another termination 12V power supply of parallel circuits unit of diode composition.
Switching value output circuit, acts on the actuating of relay excision faulty line in microcomputer protection system and acts on actuation of an alarm etc.This design P2.0 of microprocessor C8051F021 transmission mouth as output signal.When P2.0 normal condition (high level), triode switch not conducting, relay is failure to actuate; When sending action instruction, during its output low level, two triode switch successively conductings, LED is bright, the actuating of relay simultaneously, and excision faulty line reaches the object of protection power transmission line with also reporting to the police.
The above; it is only preferred embodiment of the present utility model; not the utility model is imposed any restrictions; every above embodiment is done according to the utility model technical spirit any simple modification, change and equivalent structure change, all still belong in the protection range of technical solutions of the utility model.
Claims (7)
1. the microprocessor relay and protection system of a transmission line, it is characterized in that: comprise voltage and form loop (1), low-pass filter circuit (2), data storage circuit (3), microprocessor (4) and switching value output module (7), described voltage forms loop (1), low-pass filter circuit (2), data storage circuit (3), microprocessor (4) is connected successively, described microprocessor (4) input is connected with keyboard (5), described microprocessor (4) output and display (6), switching value output module (7) is connected.
2. according to the microprocessor relay and protection system of a kind of transmission line according to claim 1, it is characterized in that: described voltage forms loop (1) and is made up of transformer and connected electric resistance partial pressure type sample circuit.
3. according to the microprocessor relay and protection system of a kind of transmission line according to claim 1, it is characterized in that: the single-chip microcomputer that described microprocessor (4) is model C 8051F021.
4. according to the microprocessor relay and protection system of a kind of transmission line according to claim 1, it is characterized in that: described low-pass filter circuit (2) is RC low-pass filter circuit.
5. according to the microprocessor relay and protection system of a kind of transmission line according to claim 1, it is characterized in that: the analog signal storage that described data storage circuit (3) is model LF398.
6. according to the microprocessor relay and protection system of a kind of transmission line according to claim 1, it is characterized in that: described display (6) is LED display.
7. according to the microprocessor relay and protection system of a kind of transmission line according to claim 1, it is characterized in that: described switching value output module (7) is by a PNP triode, a NPN triode, diode, light-emitting diode, the switching value output circuit of relay composition, wherein PNP triode base stage is connected with single-chip microcomputer signal output part by resistance, PNP triode collector electrode is connected with NPN transistor base by resistance, PNP triode collector electrode is also connected with NPN triode emitter-base bandgap grading by resistance, described NPN transistor collector connecting luminous diode, relay, parallel circuits unit one end of diode composition, described NPN triode emitter grounding, described PNP triode emitter-base bandgap grading connects 5V power supply, described light-emitting diode, relay, another termination 12V power supply of parallel circuits unit of diode composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420644955.6U CN204144930U (en) | 2014-10-31 | 2014-10-31 | A kind of microprocessor relay and protection system of transmission line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420644955.6U CN204144930U (en) | 2014-10-31 | 2014-10-31 | A kind of microprocessor relay and protection system of transmission line |
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| CN204144930U true CN204144930U (en) | 2015-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420644955.6U Expired - Fee Related CN204144930U (en) | 2014-10-31 | 2014-10-31 | A kind of microprocessor relay and protection system of transmission line |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443147A (en) * | 2016-10-12 | 2017-02-22 | 长沙群瑞电子科技有限公司 | Four-way overvoltage recording device |
| CN107623313A (en) * | 2016-12-20 | 2018-01-23 | 合肥亚飞电力设备有限公司 | A kind of new supply line's relay protecting method based on microcomputer |
-
2014
- 2014-10-31 CN CN201420644955.6U patent/CN204144930U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443147A (en) * | 2016-10-12 | 2017-02-22 | 长沙群瑞电子科技有限公司 | Four-way overvoltage recording device |
| CN107623313A (en) * | 2016-12-20 | 2018-01-23 | 合肥亚飞电力设备有限公司 | A kind of new supply line's relay protecting method based on microcomputer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150204 Termination date: 20181031 |