CN201937255U - Relay protection system for in-phase power supply equipment - Google Patents
Relay protection system for in-phase power supply equipment Download PDFInfo
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- CN201937255U CN201937255U CN2011200132708U CN201120013270U CN201937255U CN 201937255 U CN201937255 U CN 201937255U CN 2011200132708 U CN2011200132708 U CN 2011200132708U CN 201120013270 U CN201120013270 U CN 201120013270U CN 201937255 U CN201937255 U CN 201937255U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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Abstract
The utility model discloses a relay protection system for in-phase power supply equipment, which mainly comprises a microcomputer protection device, a circuit breaker 1QF and a current transformer 1TA both arranged between an Alpha bus and the in-phase power supply equipment, a circuit breaker 2QF and a current transformer 2TA both arranged between a Beta bus and the in-phase power supply equipment, and two voltage transformers 1TV and 2TV respectively arranged on the Alpha and the Beta buses, wherein the current transformers 1TA and 2TA as well as the voltage transformers 1TV and 2TV are respectively connected with the microcomputer protection device. By adopting the relay protection system, the in-phase power supply equipment can be quickly cut off and isolated when a fault occurs, so that the continued damage to the equipment can be avoided, the fault-free part can be ensured to quickly recover into normal operation, and electrical energy can be continuously transmitted to an electric locomotive safely and reliably.
Description
Technical field
The utility model relates to a kind of cophase supply equipment relaying protection system.
Background technology
Because the particularity of electrified railway traction power supply system structure and load, caused electric power system severe three-phase imbalance, have a large amount of harmonic wave and idle, the existence of especially electric phase-splitting link makes the electric locomotive safe operation have big hidden danger, has restricted at a high speed, the development of heavy haul railway.In order to overcome the problems referred to above, tractive power supply system generally adopts the commutation measure to reduce the influence of negative phase-sequence to electric power system, adopt automatic neutral-section passing device to solve electric express locomotive, adopt the shunt capacitance device to compensate idle that traction load produces by electric phase-splitting problem.But these measures can only be played mitigation, still exist technological deficiency.The provide another kind of approach of the proposition of cophase supply technology for this reason, for comprehensively addressing the above problem.Cophase supply has not only realized three-phase equilibrium, and the dynamic compensation harmonic and idle of energy, is the important development direction of high-speed railway traction power supply.
The cophase supply system is on the basis of traction substation traditional three-phase-two phase transformer, by inserting cophase supply equipment and carrying out that corresponding transformation realizes.The cophase supply system as shown in Figure 1.Among Fig. 1, three-phase-two phase transformer becomes the traction transformer of the two-phase power supply of tractive power supply system for any one three phase mains with electric power system, its former limit three-phase links to each other with utility network, the equipment that connects between the α output phase on inferior limit and the β output mutually is cophase supply equipment, is followed successively by step-down transformer G1, single-phase converter M1, dc capacitor C, single-phase converter M2, step-down transformer G2; α is electric locomotive L power supply mutually; The high side voltage of step-down transformer G1 and step-down transformer G2 is 27.5kV, and low-pressure side voltage is 500-2000V.
The cophase supply system can comprehensively solve various problems such as the electric phase-splitting, negative phase-sequence of tractive power supply system, idle, harmonic wave, is one of future thrust of traction power supply.But present research mainly concentrates on aspects such as cophase supply system formation and active filter control strategy, and is less to the research of its relevant supporting technology.Cophase supply equipment is as the core part of electrified railroad homo-phase traction power supply system; can run into failure conditions such as short circuit inevitably; the generation of these faults; safety with serious threat cophase supply equipment; especially the single-phase converter that constitutes based on the high-power electric and electronic switch element; its condition of work harshness costs an arm and a leg, and therefore must provide perfect, rational protection to cophase supply equipment.When the cophase supply device interior broke down, action message was answered in protection, and cophase supply equipment both sides circuit breaker can trip rapidly; When the traction net broke down, protection should reliably be failure to actuate.At present, also there is not special relay protective plan at cophase supply equipment.
The utility model content
The purpose of this utility model is to provide a kind of cophase supply equipment relaying protection system, satisfies reliability, selectivity, quick-action, the sensitivity requirement of relaying protection, realizes the perfect protection of whole cophase supply equipment.By excision isolation rapidly, destroy when this relaying protection system can make the cophase supply device fails, guarantee the normal operation of the rapid recovery of fault-free part, thereby continue as electric locomotive transmission of electric energy safely and reliably in order to avoid be subjected to continuation.
The purpose of this utility model is achieved through the following technical solutions: a kind of cophase supply equipment relaying protection system; mainly by microcomputer protecting device, be arranged on the circuit breaker 1QF summation current transformer 1TA between α bus and the cophase supply equipment and be arranged on the β bus and cophase supply equipment between circuit breaker 2QF summation current transformer 2TA constitute, described current transformer 1TA summation current transformer 2TA all links to each other with microcomputer protecting device.
The utility model also comprises the voltage transformer 1TV that is arranged on the α bus and is arranged on voltage transformer 2TV on the β bus that described voltage transformer 1TV all links to each other with microcomputer protecting device with voltage transformer 2TV.
Described cophase supply equipment mainly constitutes by being arranged between α bus and the β bus and by link cable continuous successively step-down transformer G1, single-phase converter M1, dc capacitor C, single-phase converter M2, step-down transformer G2, and described step-down transformer G1 all links to each other with microcomputer protecting device by the relay tip signal with step-down transformer G2; The high side voltage of step-down transformer G1 and step-down transformer G2 is 27.5kV, and low-pressure side voltage is 500-2000V.
All α buses that relate in the utility model are the bus that is connected three-phase in the cophase supply system-two phase transformer α output phase, and all β buses are the bus that is connected three-phase in the cophase supply system-two phase transformer β output phase; The α bus is the electric locomotive power supply, and the β bus is input to the active power of cophase supply equipment, except the active power of cophase supply devices consume, is all outputed to the α bus to supply with electric locomotive by cophase supply equipment.
The microcomputer protecting device that relates in the utility model is existing, and it belongs to mature technology, so no longer narration in the utility model.Microcomputer protecting device can be by the current transformer that inserts, and the state of the loop pairs of signals of measuring components such as voltage transformer monitors, control and protection, and such as short-circuit protection, overload protection, one-phase ground protection or the like.When not adopting microcomputer protecting device; realize these defencive functions by high-voltage board with relay; adopt microcomputer protecting device; function is more relatively; such as can conveniently accepting Long-distance Control; carry out communication to superior system; transmit current/voltage, the power electric quantity signal in loop; can adjust protection set point or the like easily; in a word; microcomputer protecting device is exactly the protective device of functions such as realization measurement, control, protection that can intelligence, all functions can be concentrated in the cover protective device and realize, also can be distributed in many cover protective devices and realize.
In sum, the beneficial effects of the utility model are: with step-down transformer G1, single-phase converter M1, dc capacitor C, single-phase converter M2, the cophase supply equipment that link cable between step-down transformer G2 and the said equipment constitutes is object of protection, overcurrent protection is moved in cophase supply device interior catastrophe failure, the active power differential protection moves in cophase supply device interior minor failure, the non electrical quantity protection is moved in step-down transformer G1 or step-down transformer G2 fuel tank internal fault, overcurrent protection, the active power differential protection, non electrical quantity protection triplicity provides perfect relaying protection function for cophase supply equipment; Under-voltage protection is when α output phase busbar fault or β output phase busbar fault or three-phase-two-phase transformer fault, disconnect cophase supply equipment loop, make cophase supply equipment out of service, prevent that the impact when busbar voltage is recovered from damaging cophase supply equipment; Breaker fail protection is in the cophase supply device fails and during the circuit breaker tripping, the adjacent higher level's circuit breaker of tripping is to reduce the cophase supply device damage.By excision isolation rapidly, destroy when the utility model can make the cophase supply device fails, guarantee the normal operation of the rapid recovery of tractive power supply system fault-free part, thereby continue as electric locomotive transmission of electric energy safely and reliably in order to avoid be subjected to continuation.
Description of drawings
Fig. 1 is existing cophase supply system schematic;
Fig. 2 is a cophase supply equipment relaying protection system schematic diagram of the present utility model;
Fig. 3 is α output phase overcurrent protection theory diagram;
Fig. 4 is β output phase overcurrent protection theory diagram;
Fig. 5 is α output phase under-voltage protection theory diagram;
Fig. 6 is β output phase under-voltage protection theory diagram;
Fig. 7 is a kind of active power differential protection theory diagram;
Fig. 8 is another kind of active power differential protection theory diagram.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited only to this.
Embodiment:
As shown in Figure 2; the cophase supply equipment relaying protection system that the utility model relates to; mainly by microcomputer protecting device, be arranged on the circuit breaker 1QF summation current transformer 1TA between α bus and the cophase supply equipment and be arranged on the β bus and cophase supply equipment between circuit breaker 2QF summation current transformer 2TA constitute, described current transformer 1TA summation current transformer 2TA all links to each other with microcomputer protecting device.
Owing to adopted said structure, thereby can realize overcurrent protection, its course of work is: when cophase supply device interior (between current transformer 1TA and the current transformer 2TA) takes place than catastrophe failure, the electric current that microcomputer protecting device measures by current transformer 1TA or current transformer 2TA is greater than the rated load electric current, microcomputer protecting device is based on the circuit breaker of these current signal tripping cophase supply equipment both sides, thereby plays the effect of overcurrent protection; α output phase, β output phase overcurrent protection theory diagram respectively shown in Fig. 3,4, among Fig. 3 and Fig. 4,
,
The first-harmonic and the second harmonic value of difference α output current phase;
,
The first-harmonic and the second harmonic value of difference β output current phase;
,
The operating current value of representing α output phase, β output phase overcurrent protection respectively;
Be second harmonic locking threshold definite value;
,
The operation time limit of representing α output phase, β output phase overcurrent protection respectively.
Said structure can not only be realized overcurrent protection; can also prevent the overcurrent protection malfunction; its course of work is: when step-down transformer G1 or step-down transformer G2 generation magnetizing inrush current; microcomputer protecting device detects in the electric current composition second harmonic content and surpasses preset value, thereby the locking overcurrent protection prevents malfunction.
As further optimization of the present utility model, as shown in Figure 2, on the basis of said structure, the utility model has also increased the voltage transformer 1TV that is arranged on the α bus, and be arranged on voltage transformer 2TV on the β bus, described voltage transformer 1TV all links to each other with microcomputer protecting device with voltage transformer 2TV, thereby can realize under-voltage protection, its course of work is: when α output phase busbar fault or β output phase busbar fault or three-phase-two-phase transformer fault, microcomputer protecting device is by being positioned at the voltage transformer 1TV on cophase supply equipment two side bus, the voltage that voltage transformer 2TV measures is lower than the rated voltage level, microcomputer protecting device is based on the circuit breaker of these voltage signal tripping cophase supply equipment both sides, thus the realization under-voltage protection; α output phase, β export phase under-voltage protection theory diagram shown in Fig. 5,6, among Fig. 5 and Fig. 6,
,
The first-harmonic value of representing α output phase, β output phase voltage respectively;
,
Be respectively the operation voltage value of α output phase, the under-voltage protection of β output phase;
,
Operation time limit for α output phase, the under-voltage protection of β output phase.
Further optimize as of the present utility model; as shown in Figure 2; on the basis of further optimizing; the utility model also is connected the relay tip signal of step-down transformer G1 in the cophase supply equipment and step-down transformer G2 respectively with microcomputer protecting device; thereby realized the non electrical quantity protection; its course of work is: when step-down transformer G1 in the cophase supply equipment or step-down transformer G2 fuel tank internal fault; its inner heavy Buchholz relay or pressure switch of installing; temperature relay can send contact point signal to microcomputer protecting device; microcomputer protecting device is based on the circuit breaker of these signal tripping cophase supply equipment both sides, thus the protection of realization non electrical quantity.
The utility model can not only be realized above-mentioned functions, can also realize active power differential protection and breaker fail protection, and its course of work is as follows:
The active power differential protection: when cophase supply equipment normally moved, the β bus was input to the active power of cophase supply equipment, except the active power of cophase supply devices consume, was all outputed to the α bus to supply with electric locomotive by cophase supply equipment; When the cophase supply device fails; can consume a large amount of active energies; when the active power of its consumption operating power value greater than the active power differential protection, the circuit breaker of microcomputer protecting device tripping cophase supply equipment both sides, thus realize the active power differential protection.The active power calculating method of cophase supply devices consume is: at first record three-phase-two phase transformer α output by current transformer 1TA, current transformer 2TA, voltage transformer 1TV and voltage transformer 2TV and export mutually fundamental voltage and electric current with β mutually; calculate α output according to fundamental voltage and galvanometer then and export mutually fundamental active power with β mutually; thereby calculate the active power of cophase supply devices consume; whole process is all carried out data computation by microcomputer protecting device, and the α output computing formula with β output fundamental active power mutually mutually is as follows:
In the formula: Re[] expression gets the real part of result of calculation,
Represent fundamental voltage and electric current that three-phase-two phase transformer α output measures mutually respectively,
Expression
Conjugation,
Represent fundamental voltage and electric current that β output measures mutually respectively,
Expression
Conjugation,
Represent α output phase and β output fundamental active power mutually respectively.
When cophase supply equipment both sides all are defined as the active power direction bus that sensing connects and are positive direction, or when all the active power direction being defined as bus that sensing connects and being negative direction, the theory diagram of active power differential protection as shown in Figure 7.
When cophase supply equipment one side is defined as the active power direction bus that sensing connects and is positive direction, and opposite side is when being defined as the active power direction bus that sensing connects and being negative direction, and the theory diagram of active power differential protection as shown in Figure 8.
Breaker fail protection: when the fault that takes place on the cophase supply equipment and circuit breaker 1QF or circuit breaker 2QF tripping, step down side circuit breaker that must the tripping correspondence could excise fault.Therefore, when sending trip signal to circuit breaker after a period of time, microcomputer protecting device still can detect fault, by the step down side circuit breaker of breaker fail protection tripping correspondence, thereby realizes breaker fail protection.
As mentioned above, just can realize the utility model preferably.
Claims (3)
1. cophase supply equipment relaying protection system; it is characterized in that; mainly by microcomputer protecting device, be arranged on the circuit breaker 1QF summation current transformer 1TA between α bus and the cophase supply equipment and be arranged on the β bus and cophase supply equipment between circuit breaker 2QF summation current transformer 2TA constitute, described current transformer 1TA summation current transformer 2TA all links to each other with microcomputer protecting device.
2. a kind of cophase supply equipment relaying protection system according to claim 1; it is characterized in that; also comprise the voltage transformer 1TV that is arranged on the α bus and be arranged on voltage transformer 2TV on the β bus, described voltage transformer 1TV all links to each other with microcomputer protecting device with voltage transformer 2TV.
3. a kind of cophase supply equipment relaying protection system according to claim 1 and 2; it is characterized in that; described cophase supply equipment mainly constitutes by being arranged between α bus and the β bus and by link cable continuous successively step-down transformer G1, single-phase converter M1, dc capacitor C, single-phase converter M2, step-down transformer G2, and described step-down transformer G1 all links to each other with microcomputer protecting device by the relay tip signal with step-down transformer G2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200132708U CN201937255U (en) | 2011-01-17 | 2011-01-17 | Relay protection system for in-phase power supply equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200132708U CN201937255U (en) | 2011-01-17 | 2011-01-17 | Relay protection system for in-phase power supply equipment |
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| CN201937255U true CN201937255U (en) | 2011-08-17 |
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| CN2011200132708U Expired - Lifetime CN201937255U (en) | 2011-01-17 | 2011-01-17 | Relay protection system for in-phase power supply equipment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102104247A (en) * | 2011-01-17 | 2011-06-22 | 西南交通大学 | Same-phase power supply equipment relay protection system and method |
| CN112736864A (en) * | 2020-12-11 | 2021-04-30 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Direct-current line protection method and system based on voltage Euclidean distance |
| CN113489006A (en) * | 2021-07-30 | 2021-10-08 | 盾石磁能科技有限责任公司 | Energy management device in traction power supply system and traction power supply system |
| CN113659447A (en) * | 2021-07-20 | 2021-11-16 | 许继集团有限公司 | Method for automatically correcting voltage sampling polarity of series side of in-phase power supply device |
-
2011
- 2011-01-17 CN CN2011200132708U patent/CN201937255U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102104247A (en) * | 2011-01-17 | 2011-06-22 | 西南交通大学 | Same-phase power supply equipment relay protection system and method |
| CN102104247B (en) * | 2011-01-17 | 2013-07-10 | 西南交通大学 | Same-phase power supply equipment relay protection method |
| CN112736864A (en) * | 2020-12-11 | 2021-04-30 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Direct-current line protection method and system based on voltage Euclidean distance |
| CN112736864B (en) * | 2020-12-11 | 2022-04-26 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Direct-current line protection method and system based on voltage Euclidean distance |
| CN113659447A (en) * | 2021-07-20 | 2021-11-16 | 许继集团有限公司 | Method for automatically correcting voltage sampling polarity of series side of in-phase power supply device |
| CN113489006A (en) * | 2021-07-30 | 2021-10-08 | 盾石磁能科技有限责任公司 | Energy management device in traction power supply system and traction power supply system |
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Granted publication date: 20110817 |