CN101777761A - Method and system for protecting transformer substation remote terminal unit (RTU) terminal communication - Google Patents
Method and system for protecting transformer substation remote terminal unit (RTU) terminal communication Download PDFInfo
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- CN101777761A CN101777761A CN200910110890A CN200910110890A CN101777761A CN 101777761 A CN101777761 A CN 101777761A CN 200910110890 A CN200910110890 A CN 200910110890A CN 200910110890 A CN200910110890 A CN 200910110890A CN 101777761 A CN101777761 A CN 101777761A
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Abstract
The invention relates to a method and a system for protecting transformer substation remote terminal unit (RTU) terminal communication. The system for protecting the transformer substation RTU terminal communication comprises a lightning protection module consisting of a common-mode high-frequency absorption circuit, an energy leakage circuit, a high-frequency damp circuit, a clamp protection circuit and an equipotential protection circuit, wherein the common-mode high-frequency absorption circuit, the energy leakage circuit, the high-frequency damp circuit and the clamp protection circuit are sequentially arranged along a feeding direction of shield communication cable signals. The lightning protection module prevents overvoltage invasion to the communication bus by the means of energy leakage, absorption, high-frequency damp, clamp protection, equipotential protection, and the like. The lightning protection module is mounted on each node of the communication bus and can control the applied voltage of the transformer substation RTU and other intelligent terminal communication chips at about 5Vduring strong lightning stroke and operation of overvoltage, thereby preventing the communication chip from being damaged, ensuring normal communication, completely avoiding influence on the transformer substation RTU and other intelligent terminal communication bus during lightning stroke and operation of overvoltage and ensuring normal communication of the whole bus during lightning stroke and overvoltage.
Description
Technical field
The invention belongs to the lightning protection of transformer substation remote terminal unit (RTU) terminal communication bus, anti-over-voltage protection technology field.
Background technology
Follow a large amount of uses of increasing Microcomputer Protection and other intelligent terminals, the communication lightning protection, prevented pressing to an important process of engineering design in transformer station.The communication lightning protection generally is to occur as three grades of lightning protection, promptly on the basis of a secondary lightning protection, and the salvo that secondary weak links such as communication are set up again.The RTU of transformer station and other intelligent terminal communication systems are subjected to thunder and lightning and disturb, and mainly contain following channel:
(1) geodetic network forms not equipotential: the too high and earth resistance maldistribution of Resistance of Grounding Grids that occurs because of geology reason or construction reason, can be when releasing thunder-strike current, form not equipotential (being voltage difference) not existing together of earth mat, the voltage difference of this high frequency is because the reason of high frequency capacitance coupling, and put on the different piece of equipment, cause the device overvoltage to damage.
(2) connection induction overvoltage: near the zone the connection is born in thunderous percussion, can by around lead, equipment, the soil space and the electrical couplings that form, affact the communication device that communication voltage has only several volts or tens volts, cause the communication apparatus damage.
(3) counterattack overvoltage: when many earth mats exist, when place's earth mat is released thunder-strike current, near the faults such as insulation breakdown of another place's earth mat equipment too high ground voltage may cause, we are called counterattack.
(4) electrical network circulation: communication shielding multipoint earthing can cause earth mat circulation in not very good ground system, and under the thunderbolt state, this circulation is very big, causes communication apparatus to damage.
Communication lightning protection major technology means are to select the surge of appropriate size (surge) protector for use at present, increase in the communication porch of all automation equipments and join elementary surge protective device.Increase join surge protective device after, the failure rate of communication module descends to some extent, but still has many failure conditions to exist under strong thunderbolt situation, has influence on the security of operation and the operating efficiency of transformer station.Have the relatively simple for structure of Surge Protector now; volume is small and exquisite; the finite energy of releasing; be applicable to the lightning protection and the overvoltage protection of most of communication occasions; but the weakness of showing is arranged for transformer station's occasion lightning protection capability; because the general electromagnetic interference of transformer station is serious relatively, open-air occasion lightning impulse is generally bigger than normal.From practical experience, common Surge Protector is in use appeared many faults.
Under the situation that the protection of common lightning protection device is arranged, the communication module of microcomputer protecting device or other intelligent terminals also can damage, by analysis, main cause have following some:
(1) earth resistance is excessive or inhomogeneous
Desirable ground network is an infinitely great earth mat, and promptly earth resistance is zero, in this case, if equipment directly is not struck by lightning, each part of equipment damage of can not being struck by lightning in theory.But owing to the geology reason, even the very big transformer station of investment, its earth mat can not guarantee very good, and mountain area stone matter occasion particularly is embodied in that earth resistance is bigger than normal, the resistance maldistribution.In this case, when the big electric current of high frequency flows through earth mat, can form very high voltage differential on the net, break equipment on ground.Traditional lightning protection device is a design premises with good earth mat, so lightning protection effect will be had a greatly reduced quality when above-mentioned situation occurring.
(2) there is not equipotential protection design
Common lightning protection component is for saving cost; with good earth mat as design premises; so the point that each need not protected in the system of electrical link, subsystem are arranged design equipotential safeguard measure; the maximum voltage deviation that can't guarantee each point causes the communication apparatus overvoltage and damages within allowed band.
(3) device is aging easily, loses the lightning protection effect
Common communication lightning protection component all is a passive device, repeatedly unload and put than after the macro-energy, lightning protection component may wear out, owing to there is not the state deixis, the staff can't monitor the operating state of lightning protection component in real time, can not be safeguarded timely and be changed after the lightning protection component disabler, cause communication apparatus not having to move the safety of serious threat communication apparatus under the condition of lightning protection measures.
Summary of the invention
The present invention is directed to the deficiency of existing lightning protection device; a kind of transformer substation remote terminal unit (RTU) terminal communication guard method and system thereof are provided; take absorption, equipotential, multiple lightning protection, the combination of anti-overvoltage stimulation optimization such as active; thoroughly solve the influence of thunderbolt and switching overvoltage, guarantee the safety of the RTU of transformer station and other intelligent terminal communication buss the RTU of transformer station and other intelligent terminal communication buss.
Transformer substation remote terminal unit (RTU) terminal communication guard method provided by the invention:
At first, the common mode high-frequency signal that is coupled into by the loop absorption lightning wave that adopts ferromagnetic element to form and dissipate with form of heat; And then by the energy leadage circuit overwhelming majority's thunder and lightning energy is released to earth mat, reduce greatly through preceding two link thunder and lightning energy; For the better protection communication module, adopt the high frequency antihunt circuit once more high-frequency signal to be handled again, the high frequency antihunt circuit forms high resistant to high-frequency signal, reduces the release energy of high-frequency signal to communication device; And adopt clamping protective circuit that the connection voltage to earth is clamped down on level and equipotential protective circuit that equipment is not damaged to prevent that screen from disturbing the too high induced voltage of formation because of being subjected to thunder and lightning; so far, the thunder and lightning energy can not cause any infringement to communication module.
Further, in order to improve the intelligent of lightning-protection module, also add up thunderbolt overvoltage number of times, lightning strike spot, and communicate by letter, statistical information is uploaded scheduling with comprehensive automation system of transformer substation by the detection control module of built-in intelligence chip.In addition, native system also comprises background monitoring software, is installed on the integrated automation of transformation stations client computer, makes things convenient for thunderbolt of monitoring communications bus or overvoltage information.
In addition, by being installed on thunderbolt of background monitoring software supervision communication bus or the overvoltage information on the integrated automation of transformation stations client computer.
Transformer substation remote terminal unit (RTU) terminal communication protection system provided by the invention:
Comprise by the lightning-protection module of forming with the lower part:
Common mode high frequency absorption circuit is made up of ferromagnetic element, absorbs the common mode high-frequency signal that lightning wave is coupled into, dissipates with form of heat;
The energy leadage circuit releases the overwhelming majority's thunder and lightning energy to earth mat;
The high frequency antihunt circuit is made up of inductive element, and high-frequency signal is formed high resistant, reduces the energy of releasing to communication device;
Clamping protective circuit is clamped down on the connection voltage to earth level that equipment is not damaged;
The equipotential protective circuit prevents that screen from forming too high induced voltage because of disturbed by thunder and lightning;
Above-mentioned common mode high frequency absorption circuit, energy leadage circuit, high frequency antihunt circuit, clamping protective circuit set gradually along shielded communication cable signal conveys direction.
Further, also comprise active detection control module, comprise the built-in intelligence chip the detection controller, with detect state indicating member that controller is connected and be the power supply of monitor controller and the power supply of state indicating member, with statistics thunderbolt overvoltage number of times, lightning strike spot, and communicate by letter (RS485 bus or CANBUS bus) with comprehensive automation system of transformer substation, statistical information is uploaded scheduling.Active detection control module is monitored the validity of lightning protection circuit, improves the protection curve of equipotential protective circuit, improves the thunder and lightning relieving capacity by the bypass measure, improves the durability of thunder resisting equipment simultaneously.Detect the control module supervisory circuit and can indicate the state of thunder resisting equipment, for the operations staff offers help, detect control module the inside built-in intelligence chip simultaneously, can add up thunderbolt overvoltage number of times, lightning strike spot, and communicate by letter (RS485 bus or CANBUS bus) with comprehensive automation system of transformer substation, statistical information is uploaded scheduling.
The operation principle of native system is: when the RTU of transformer station and other smart machines layout communication bus, lightning-protection module is arranged on each node.Twin-core shielded cable (comprising shielding conductor) is from the output of lightning-protection module one side input opposite side.When thunderbolt takes place when, the loop that the common mode high-frequency signal that lightning wave is coupled at first is made up of the particular iron magnetic cell absorbs and dissipates with form of heat, and then the energy leadage circuit releases the overwhelming majority's thunder and lightning energy to earth mat, reduce greatly through preceding two link thunder and lightning energy, for the better protection communication module, adopt the high frequency antihunt circuit once more high-frequency signal to be handled, the high frequency antihunt circuit forms high resistant to high-frequency signal, reduces the release energy of high-frequency signal to communication device; Adopt the clamper protection that the connection voltage to earth is clamped down on the level that equipment is not damaged; also adopt the equipotential protection to prevent that screen from forming too high induced voltage because of disturbed by thunder and lightning; so far; the thunder and lightning energy can not cause any infringement to communication module, and is more perfect by above various measure whole proposal.In order to improve the intelligent of lightning-protection module, detecting control module the inside built-in intelligence chip, can add up thunderbolt overvoltage number of times, lightning strike spot, and communicate by letter (RS485 bus or CANBUS bus), statistical information is uploaded scheduling with integrated automation of transformation stations supervisory control system.
The present invention is directed to the deficiency of existing lightning protection device; adopt absorption, equipotential, lightning protection principle such as active; with multiple lightning protection, the combination of anti-overvoltage stimulation optimization; that can control the RTU of transformer station and other intelligent terminal communication chips when strong thunderbolt and switching overvoltage applies voltage about 5V; thereby the protection communication chip can not damage; communication is normal, thoroughly solves the influence to the RTU of transformer station and other intelligent terminal communication buss of thunderbolt and switching overvoltage.Native system also disposes the detection control module of built-in intelligence chip, accurately to add up thunderbolt overvoltage number of times, lightning strike spot in real time, detect control module and communicate by letter with comprehensive automation system of transformer substation (RS485 bus or CANBUS bus), statistical information is uploaded scheduling; In addition, also include background monitoring software, be installed on the integrated automation of transformation stations client computer, make things convenient for thunderbolt of monitoring communications bus or overvoltage information, improved the intelligent of lightning-protection system.
Description of drawings
Below in conjunction with accompanying drawing the present invention is described in further detail.
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
The present invention adopts absorption, equipotential, lightning protection principle such as active, with multiple lightning protection, the combination of anti-overvoltage stimulation optimization, that can control the RTU of transformer station and other intelligent terminal communication chips when strong thunderbolt and switching overvoltage applies voltage about 5V, thereby the protection communication chip can not damage, and communication is normal; And the configuration detection control module, accurately to add up thunderbolt overvoltage number of times, lightning strike spot in real time, improve the intelligent of lightning-protection system.Below in conjunction with Fig. 1, technical scheme of the present invention is described in detail:
The transformer substation remote terminal unit (RTU) terminal communication protection system is divided into disperses lightning-protection module and two parts of background monitoring software.Lightning-protection module comprises that collection is contained in lightning-protection module and the active detection control module in the box body, and its profile is small and exquisite, is arranged on each node of communication bus, and the wiring guide rail or the brute force that are installed in switch cubicle or protection screen cabinet nearby are affixed on screen cabinet madial wall; Background monitoring software is installed on the integrated automation of transformation stations supervisory control system client computer, is convenient to thunderbolt of monitoring communications bus and overvoltage information.
Lightning-protection module is made of jointly common mode high frequency absorption circuit 1, energy leadage circuit 2, high frequency antihunt circuit 3 and clamping protective circuit 4 and equipotential protective circuit 5, and common mode high frequency absorption circuit 1, energy leadage circuit 2, high frequency antihunt circuit 3, clamping protective circuit 4 set gradually along shielded communication cable signal conveys direction.Wherein:
Common mode high frequency absorption circuit 1 is made up of ferromagnetic element, absorbs the common mode high-frequency signal that lightning wave is coupled into, dissipates with form of heat.
High frequency antihunt circuit 3 comprises that inductive element L1, the L2, resistance element R1, the R2 that are serially connected in respectively on first, second holding wire of shielded communication cable A, the B form, and high-frequency signal is formed high resistant, reduces the energy of releasing to communication device.
Clamping protective circuit 4 comprises the voltage clamp type Transient Suppression Diode TVS1, the TVS2 that are connected between first, second holding wire of shielded communication cable A, B and the protective earthing PE, the connection voltage to earth is clamped down on the level that equipment is not damaged.
Equipotential protective circuit 5 comprises the equipotential protector that is connected between shielded communication cable shielding line C and the protective earthing PE, prevents that screen from forming too high induced voltage because of disturbed by thunder and lightning.
Active detection control module, comprise the built-in intelligence chip detection controller 6, with detect state indicating member 7 that controller 6 is connected and be the AC/DC220V power of alterating and direct current 8 of monitor controller 6 and 7 power supplies of state indicating member, with statistics thunderbolt overvoltage number of times, lightning strike spot, and communicate by letter with integrated automation of transformation stations supervisory control system 9 by RS485 bus or CANBUS bus, statistical information is uploaded scheduling.Active detection control module is monitored the validity of lightning protection circuit, improves the protection curve of equipotential protective circuit, improves the thunder and lightning relieving capacity by the bypass measure, improves the durability of thunder resisting equipment simultaneously.Detect controller 6 built-in intelligence chips, can add up thunderbolt overvoltage number of times, lightning strike spot, the state indicating member can be indicated the state of thunder resisting equipment in real time, for the operations staff offers help.
Background monitoring software is installed on the client computer of integrated automation of transformation stations supervisory control system 9.Detect controller 6 and pass through RS485 bus or CANBUS bus communication, statistical information is uploaded scheduling, make things convenient for thunderbolt of monitoring communications bus or overvoltage information with integrated automation of transformation stations supervisory control system 9.
The operation principle of native system is: when the RTU of transformer station and other smart machines layout communication bus, lightning-protection module is arranged on each node.Twin-core shielded cable (comprising shielding conductor) is from the output of lightning-protection module one side input opposite side.When thunderbolt takes place when, the loop that the common mode high-frequency signal that lightning wave is coupled at first is made up of the particular iron magnetic cell absorbs and dissipates with form of heat, and then the energy leadage circuit releases the overwhelming majority's thunder and lightning energy to earth mat, reduce greatly through preceding two link thunder and lightning energy, for the better protection communication module, adopt the high frequency antihunt circuit once more high-frequency signal to be handled, the high frequency antihunt circuit forms high resistant to high-frequency signal, reduces the release energy of high-frequency signal to communication device; Adopt clamping protective circuit the connection voltage to earth to be clamped down on the level that equipment is not damaged; prevent that by the equipotential protective circuit screen from forming too high induced voltage because of disturbed by thunder and lightning; so far, the thunder and lightning energy can not cause any infringement to communication module.Detect control module the inside built-in intelligence chip, can add up thunderbolt overvoltage number of times, lightning strike spot, and communicate by letter, statistical information is uploaded scheduling with integrated automation of transformation stations supervisory control system; The platform monitoring software is installed on the client computer of integrated automation of transformation stations supervisory control system, monitoring communications bus thunderbolt in real time or overvoltage information.
The above, only for preferred embodiment of the present invention, so can not limit scope of the invention process with this, i.e. the equivalence of doing according to the present patent application claim and description changes and modification, all should still belong in the scope that patent of the present invention contains.
Claims (8)
1. transformer substation remote terminal unit (RTU) terminal communication guard method is characterized in that: at first, the common mode high-frequency signal that is coupled into by the loop absorption lightning wave that adopts ferromagnetic element to form also dissipates with form of heat; And then by the energy leadage circuit overwhelming majority's thunder and lightning energy is released to earth mat, reduce greatly through preceding two link thunder and lightning energy; For the better protection communication module, adopt the high frequency antihunt circuit once more high-frequency signal to be handled again, the high frequency antihunt circuit forms high resistant to high-frequency signal, reduces the release energy of high-frequency signal to communication device; And adopt clamping protective circuit that the connection voltage to earth is clamped down on level and equipotential protective circuit that equipment is not damaged to prevent that screen from disturbing the too high induced voltage of formation because of being subjected to thunder and lightning; so far, the thunder and lightning energy can not cause any infringement to communication module.
2. guard method according to claim 1 is characterized in that: by the detection control module of built-in intelligence chip, with statistics thunderbolt overvoltage number of times, lightning strike spot, and communicate by letter with integrated automation of transformation stations supervisory control system, statistical information is uploaded scheduling.
3. guard method according to claim 2 is characterized in that: by being installed on thunderbolt of background monitoring software supervision communication bus or the overvoltage information on the integrated automation of transformation stations supervisory control system client computer.
4. the transformer substation remote terminal unit (RTU) terminal communication protection system comprises lightning-protection module, it is characterized in that: described lightning-protection module is by forming with the lower part:
Common mode high frequency absorption circuit is made up of ferromagnetic element, absorbs the common mode high-frequency signal that lightning wave is coupled into, dissipates with form of heat;
The energy leadage circuit releases the overwhelming majority's thunder and lightning energy to earth mat;
The high frequency antihunt circuit is made up of inductive element, and high-frequency signal is formed high resistant, reduces the energy of releasing to communication device;
Clamping protective circuit is clamped down on the connection voltage to earth level that equipment is not damaged;
The equipotential protective circuit prevents that screen from forming too high induced voltage because of disturbed by thunder and lightning;
Described common mode high frequency absorption circuit, energy leadage circuit, high frequency antihunt circuit, clamping protective circuit set gradually along shielded communication cable signal conveys direction.
5. protection system according to claim 4, it is characterized in that: also comprise active detection control module, comprise the built-in intelligence chip the detection controller, with detect state indicating member that controller is connected and be the power supply of monitor controller and the power supply of state indicating member; Detecting controller communicates by letter with integrated automation of transformation stations supervisory control system.
6. protection system according to claim 5 is characterized in that: also comprise background monitoring software, be installed on the client computer of integrated automation of transformation stations supervisory control system.
7. protection system according to claim 5 is characterized in that: described detection controller and integrated automation of transformation stations supervisory control system system are by RS485 bus or CANBUS bus communication.
8. protection system according to claim 4 is characterized in that: described clamping protective circuit comprises the voltage clamp type Transient Suppression Diode TVS that is connected between first, second holding wire of shielded communication cable and the protective earthing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910110890A CN101777761A (en) | 2009-01-13 | 2009-01-13 | Method and system for protecting transformer substation remote terminal unit (RTU) terminal communication |
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| CN200910110890A CN101777761A (en) | 2009-01-13 | 2009-01-13 | Method and system for protecting transformer substation remote terminal unit (RTU) terminal communication |
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Cited By (4)
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| CN102692906A (en) * | 2012-05-31 | 2012-09-26 | 重庆渝电防雷技术有限公司 | Intelligent network-based real-time online lightning early warning system for power grid |
| WO2016026522A1 (en) * | 2014-08-19 | 2016-02-25 | Pepperl + Fuchs Gmbh | Overvoltage protection device having communication means |
| US9673619B2 (en) | 2013-04-26 | 2017-06-06 | Pepperl + Fuchs Gmbh | Excess voltage protection apparatus and diagnostic method for multi-stage excess voltage protection apparatuses |
| CN109643893A (en) * | 2016-08-31 | 2019-04-16 | 德恩及索恩两合股份有限公司 | Overvoltage protection device with monitoring and communication functions |
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Cited By (4)
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| CN109643893A (en) * | 2016-08-31 | 2019-04-16 | 德恩及索恩两合股份有限公司 | Overvoltage protection device with monitoring and communication functions |
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Application publication date: 20100714 |