CN205595755U - High -voltage circuit relaying protection system - Google Patents
High -voltage circuit relaying protection system Download PDFInfo
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- CN205595755U CN205595755U CN201620198497.7U CN201620198497U CN205595755U CN 205595755 U CN205595755 U CN 205595755U CN 201620198497 U CN201620198497 U CN 201620198497U CN 205595755 U CN205595755 U CN 205595755U
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- 239000003054 catalyst Substances 0.000 claims description 12
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- 206010001541 Akinesia Diseases 0.000 description 1
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Abstract
The utility model relates to a relay protection technical field discloses a high -voltage circuit relaying protection system, and this system includes: three -phase current transformer for detect the three phase current among the high -voltage circuit, and versatile protector, with three -phase current transformer connects for three phase current according to detecting judges the trouble, and exports corresponding fault -signal, in order to carry out corresponding relay protection action, wherein, three -phase current transformer is connected to versatile protector's input. Through the technical solution, the utility model discloses not only can play the effect of protection electric wire netting, also can play fine guard action to electrical equipment moreover, realize the system protection from the electric wire netting to electrical equipment well.
Description
Technical field
This utility model relates to Protection Technology, in particular it relates to a kind of high-tension circuit relay protection system.
Background technology
Relay protection is as what the development of power system got up, is to ensure the important defence line that power system safety and stability runs, and it is main integrated protection period that the relay protection of present power system has been introduced into Microcomputer Protection.
For ensure occur all kinds of fault time protective relaying device can action in time, relay protection must is fulfilled for the requirements such as sensitive, reliable.Through development for many years, the greatly developing of computer integrated protection the most in recent years, protective relaying device also there occurs huge change.Protective relaying device successively experienced by the different developmental stage such as relay system, microcomputer complex protection formula, present forward networking, intellectuality, data communication integrative development.Further development along with science and technology; protective relaying device is more and more reliable; as long as we protect definite value to set accurately; so protection will action in time; but; go for an optimal setting program it is necessary to find optimal equilibrium point between the susceptiveness of relay protection, reliability, selectivity, rapidity.In existing electric substation actual motion, the accident caused because of protective relaying device or the fault spread caused account for larger specific gravity, it is impossible to well protect electrical network.
Utility model content
The purpose of this utility model is to provide a kind of high-tension circuit relay protection system, for solving the system protection problem from electrical network to equipment.
To achieve these goals, this utility model provides a kind of high-tension circuit relay protection system, and this system includes: threephase current transformer, for detecting the three-phase current in high-tension circuit；And comprehensive protector, it is connected with described threephase current transformer, is used for according to the three-phase current failure judgement detected, and exports corresponding fault-signal, to carry out corresponding relay protection action；Wherein, described threephase current transformer is connected to the input of described comprehensive protector.
Preferably, this system also includes: overcurrent protective device, is connected to the outfan of described comprehensive protector, for determining that according to the three-phase current detected described high-tension electricity passes by action in the case of stream at described comprehensive protector.
Preferably, this system also includes: zero sequence current mutual inductor, is connected to the input of described comprehensive protector, for detecting the zero-sequence current in high-tension circuit；And zero sequence protection device, it is connected to the outfan of described comprehensive protector, for determining that detected zero-sequence current exceedes action in the case of zero-sequence current threshold value at described comprehensive protector.
Preferably, this system also includes: fast tripping protection device, is connected to the outfan of described comprehensive protector, for action in the case of described comprehensive protector determines described high-tension circuit generation phase fault according to the three-phase current detected.
Preferably, described fast tripping protection device includes: catalyst, for determining action in the case of described high-tension circuit generation phase fault and electric current are less than failure current thresholds according to the three-phase current detected at described comprehensive protector；And fuse, for determining action in the case of described high-tension circuit generation phase fault and electric current are more than or equal to failure current thresholds according to the three-phase current detected at described comprehensive protector.
Preferably, this system also includes: phase-lacking protective device, is connected to the outfan of described comprehensive protector, for action in the case of described comprehensive protector determines described high-tension circuit generation phase-deficient operation according to the three-phase current detected.
Pass through technique scheme; this utility model carrys out the three-phase current in testing circuit by current transformer; and detected three-phase current is inputted to comprehensive protector; thus comprehensive protector can carry out failure judgement type according to detected three-phase current; corresponding relay protection action is carried out with this; this effect being possible not only to play protection electrical network, and electric equipment also can be played a very good protection, achieve the system protection from electrical network to electrical equipment well.
Other features and advantages of the utility model will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to offer and is further appreciated by of the present utility model, and constitutes a part for description, is used for explaining this utility model, but is not intended that restriction of the present utility model together with detailed description below.In the accompanying drawings:
Fig. 1 is the block diagram of the high-tension circuit relay protection system that this utility model provides；And
Fig. 2 is the circuit connection diagram of the high-tension circuit relay protection system that this utility model provides.
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described in detail.It should be appreciated that detailed description of the invention described herein is merely to illustrate and explains this utility model, it is not limited to this utility model.
Fig. 1 is the block diagram of the high-tension circuit relay protection system that this utility model provides, as it is shown in figure 1, this system includes threephase current transformer and comprehensive protector.Threephase current transformer is for detecting the three-phase current in high-tension circuit；Comprehensive protector is connected with threephase current transformer, is used for according to the three-phase current failure judgement detected, and exports corresponding fault-signal, to carry out corresponding relay protection action；Wherein, threephase current transformer is connected to the input of comprehensive protector.
Threephase current transformer detects A phase in high-tension circuit, B phase, the electric current of C phase respectively, and comprehensive protector carrys out failure judgement type according to detected A phase, B phase, the electric current of C phase.Generally, fault type included stream, single-phase earthing, phase fault, phase-deficient operation etc..
As shown in Figure 1; the high-tension circuit relay protection system that this utility model provides also includes overcurrent protective device; this overcurrent protective device is connected to the outfan of comprehensive protector, for determining that according to the three-phase current detected described high-tension electricity passes by action in the case of stream at comprehensive protector.
Specifically; in the case of A phase in the high-tension circuit that comprehensive protector detects according to threephase current transformer, B phase, C phase current determine that high-tension electricity passes by stream; comprehensive protector sends over-current signal to overcurrent protective device, controls overcurrent protective device action.Wherein, judging whether high-tension circuit the stream common knowledge for this area occurred according to three-phase current, in this, it will not go into details.
It is known that for overcurrent protection, need to set overcurrent protection definite value; but, in order to make protection definite value be suitable for being actually needed, and can the timely action when breaking down, cut off the electricity supply; misoperation can not occur again, it is necessary to set a suitable overcurrent protection definite value simultaneously.If it is unreasonable that relay protection constant value is arranged, the situation such as tripping or malfunction once occur, the loss caused is very big, and therefore the reasonable set of relay protection constant value is to ensure that the essential condition of safe operation of power system.
Current protection technology in this utility model can apply to the high-tension circuit at belt feeder place, it is also possible to is applied to the high-tension circuit at stacker place.
After it will be appreciated by those skilled in the art that belt feeder is stable, motor current is respectively less than its rated current.Therefore, in order to protect motor and circuit thereof comprehensively, overcurrent protection can set according to the actual value of distinct device, and the most merely takes 1.2 times (having plenty of 1.65 times) of rated current as overcurrent protection definite value.
Illustrate as a example by BH5-1 and the BH8-1 belt feeder broken down below:
BH5-1 belt feeder drive motor rated power be 500kW, rated current is 57.9A, when belt feeder works under maximum stream flow, it was observed that current of electric be 32A.Motor is electric current is rated current the 55.3% of the even running stage.
BH8-1 belt feeder drive motor rated power be 450kW, rated current is 52.4A, when belt feeder works under maximum stream flow, it was observed that current of electric be 31A.Motor is electric current is rated current the 59.2% of the even running stage.
By above, fault current is analyzed it can be seen that the electric current when motor even running is much smaller than its rated current.The when of there may exist excess operation in view of belt feeder; electric current likely moment exceedes the even running electric current of above statistics; and consider certain surplus; therefore; belt feeder can drive the overcurrent protection definite value of motor be set as when belt feeder drives motor even running 1.2 times of maximum current, and set the delay time of 10s.The overcurrent protection definite value of so BH5-1 motor should be the overcurrent protection definite value of 38.4A, BH8-1 motor should be 37.2A.
Electric current when contrast is broken down, the fault current being all far longer than 10s, BH5-1 fault time of two belt feeders of BH5-1, BH8-1 is 55A, if protection definite value is set as 38.4A, protection can action in time.The fault current of same BH8-1 is 71.982A, if protection definite value is set as that 37.2A, protection also are able to timely action, it is to avoid failure propagation.
Electric current when above-mentioned motor even running is it can be seen that there is bigger surplus when driving choice of electrical machine in belt feeder, and this mainly considers belt machine heavy load starting problem.So, in order to ensure sufficiently large staring torque, belt can the success of heavy load starting, belt feeder drives the type selecting of motor to have bigger surplus.Belt feeder drives motor when normally starting, and the electric current starting moment reaches 4-7 times of rated current, and the No Load Start time is about 10 seconds, during heavy load starting, starts 20 seconds around.
Therefore, want the normal startup optimization of belt feeder, need to set a startup time, within this time, overcurrent protection akinesia.Thus can be set in comprehensive protector belt feeder start first 20 seconds in, shield over-current signal, so startup stage can guarantee that equipment normally starts, do not have overcurrent tripping situation.It is to say, start in first 20 seconds at belt feeder, even if the A phase that detects according to threephase current transformer of comprehensive protector, B phase, the electric current of C phase judge over current fault, the most not to overcurrent protective device output overcurrent signal, overcurrent protective device is failure to actuate.
The most such as stacker, according to the history curve of stacker operating current, when stacker normally works, the electric current of stacker is at about 21A, and stacker hangs when skin starts a peak point current, and peak is about at about 60A.When stacker high tension cable generation earth fault, monophase current reaches 81.97A, and the persistent period was more than 3 minutes.Therefore, it can the overcurrent protection definite value setting stacker as 1.2 times of peak 60A, i.e. 72A; delay time is 10s, and so when stacker generation singlephase earth fault, overcurrent protection can action in time; cut off the electricity supply, prevent fire incident, also do not have misoperation simultaneously.
For stacker, it is also possible to set the protection of zero-sequence current, as it is shown in figure 1, the high-tension circuit relay protection system that this utility model provides also includes zero sequence current mutual inductor and zero sequence protection device.Zero sequence current mutual inductor is connected to the input of comprehensive protector, for detecting the zero-sequence current in high-tension circuit；Zero sequence protection device is connected to the outfan of comprehensive protector, for determining that detected zero-sequence current exceedes action in the case of zero-sequence current threshold value at comprehensive protector.
Specifically, zero sequence current mutual inductor is connected in high-tension circuit, size with the zero-sequence current in detection high-tension circuit, and the size of detected zero-sequence current is inputted to comprehensive protector, the size of the zero-sequence current detected by zero sequence current mutual inductor is compared by comprehensive protector with zero-sequence current threshold value set in advance, in the size of the zero-sequence current detected by zero sequence current mutual inductor more than (be now also likely to be and singlephase earth fault occurs) in the case of (or being equal to) zero-sequence current set in advance threshold value, comprehensive protector sends zero sequence signal to zero sequence protection device, control zero sequence protection device action.
As shown in Figure 1; the high-tension circuit relay protection system that this utility model provides also includes fast tripping protection device; this fast tripping protection device is connected to the outfan of comprehensive protector, for action in the case of comprehensive protector determines high-tension circuit generation phase fault according to the three-phase current detected.Here, determining, according to the A phase detected by threephase current transformer, B phase, the electric current of C phase, the common knowledge that phase fault is this area, in this, it will not go into details.
Specifically, when comprehensive protector determines generation phase fault according to the A phase detected, B phase, the electric current of C phase, phase fault signal is sent to fast tripping protection device, to control fast tripping protection device action.
The fast tripping protection device that this utility model provides can apply to high-voltage board.In prior art; general high voltage cabinet contactless contactor also has fast tripping protection, and (action current is 1000A; movement time is 0s); but this switch does not coordinate with the fuse in this switch; thus catalyst disengagement failure electric current is relied solely on when phase fault occurs; but owing to catalyst cuts off limited in one's ability, burn so easily causing catalyst.Therefore, it is necessary to the protection to cutting off the electricity supply is divided the work: in the normal start and stop of motor or break down but be abutted against tentaculum time current ratio is less and cut off electric current；Fault current is excised by fuse when there is serious phase fault.
So, fast tripping protection device can include catalyst and fuse, and wherein, catalyst for determining action in the case of high-tension circuit generation phase fault and electric current are less than failure current thresholds at comprehensive protector according to the three-phase current detected；Fuse for determining action in the case of high-tension circuit generation phase fault and electric current are more than or equal to failure current thresholds at comprehensive protector according to the three-phase current detected.It is simply that the employing catalyst disengagement failure electric current that fault current is little, the employing fuse disengagement failure electric current that fault current is big.
Specifically, when comprehensive protector determines generation phase fault and fault current less than failure current thresholds according to the A phase detected, B phase, the electric current of C phase, phase fault signal is sent to catalyst, with control contactor action, disengagement failure electric current.When comprehensive protector determines generation phase fault and fault current more than or equal to failure current thresholds according to the A phase detected, B phase, the electric current of C phase, send phase fault signal to fuse, to control fuse action.
In practical operation, can fast tripping protection definite value be set as follows: failure current thresholds (also referred to as fast tripping protection definite value) can be set as 1000A, and delay time is 0.2s.When fault current is less than 1000A, by catalyst disengagement failure electric current；When fault current is more than or equal to 1000A, catalyst time delay 0.2s action, play a protective role by fuse blows, it is to avoid burn catalyst.
Owing to there is no open-phase protection in existing relay protection system, and cause and can not cut off the electricity supply in time when phase-defect of motor runs, cause bigger fault.To this; as shown in Figure 1; the high-tension circuit relay protection system that this utility model provides also includes phase-lacking protective device; this phase-lacking protective device is connected to the outfan of comprehensive protector, for action in the case of comprehensive protector determines high-tension circuit generation phase-deficient operation according to the three-phase current detected.
Specifically, when comprehensive protector determines generation open-phase fault according to the A phase detected, B phase, the electric current of C phase, open-phase fault signal is sent to phase-lacking protective device, to control phase-lacking protective device action.Here, determining, according to the A phase detected by threephase current transformer, B phase, the electric current of C phase, the common knowledge that open-phase fault is this area, in this, it will not go into details.
The phase-lacking protective device that this utility model provides can apply to high-voltage board.In prior art, high-voltage board is not specifically designed for the protection of motor phase failure fault, when occurring that motor phase failure runs, it is impossible to starting protection is cut off the electricity supply.And use the relay protection system described in this utility model to add and can carry out open-phase protection.Additionally, all along with the increase of electric current when motor phase failure runs, overcurrent protection described above also is able to play a protective role.
Fig. 2 is the circuit connection diagram of the high-tension circuit relay protection system that this utility model provides, as in figure 2 it is shown, comprehensive protector shows four inputs, is respectively designated as 1,2,3,4, and four outfans, is respectively designated as 5,6,7,8.Wherein, input 1,2,3 receives the detection signal from threephase current transformer respectively, input 4 receives the detection signal from zero sequence current mutual inductor, outfan 5,6,7,8 output overcurrent signal, phase fault signal, open-phase fault signal and zero sequence signal respectively.Wherein, A phase that comprehensive protector is inputted according to input 1,2,3, B phase, C phase current determine whether circuit existed stream, phase fault, open-phase fault (specifically determine that way is known in the art general knowledge; it will not go into details); the zero-sequence current inputted according to input 4 determines whether to start zero-sequenceprotection, and concrete mode has been described above being described.
Preferred implementation of the present utility model is described in detail above in association with accompanying drawing; but; this utility model is not limited to the detail in above-mentioned embodiment; in technology concept of the present utility model; the technical solution of the utility model can be carried out multiple simple variant, these simple variant belong to protection domain of the present utility model.
It is further to note that each the concrete technical characteristic described in above-mentioned detailed description of the invention, in the case of reconcilable, can be combined by any suitable means.In order to avoid unnecessary repetition, various possible compound modes are illustrated by this utility model the most separately.
Additionally, can also carry out combination in any between various different embodiment of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (5)
1. a high-tension circuit relay protection system, it is characterised in that this system includes:
Threephase current transformer, for detecting the three-phase current in high-tension circuit；And
Comprehensive protector, is connected with described threephase current transformer, is used for according to the three-phase current failure judgement detected, and exports corresponding fault-signal, to carry out corresponding relay protection action；
Wherein, described threephase current transformer is connected to the input of described comprehensive protector；
This system also includes:
Fast tripping protection device, is connected to the outfan of described comprehensive protector, for action in the case of described comprehensive protector determines described high-tension circuit generation phase fault according to the three-phase current detected.
System the most according to claim 1, it is characterised in that this system also includes:
Overcurrent protective device, is connected to the outfan of described comprehensive protector, for determining that according to the three-phase current detected described high-tension electricity passes by action in the case of stream at described comprehensive protector.
System the most according to claim 1, it is characterised in that this system also includes:
Zero sequence current mutual inductor, is connected to the input of described comprehensive protector, for detecting the zero-sequence current in high-tension circuit；And
Zero sequence protection device, is connected to the outfan of described comprehensive protector, for determining that detected zero-sequence current exceedes action in the case of zero-sequence current threshold value at described comprehensive protector.
System the most according to claim 1, it is characterised in that described fast tripping protection device includes:
Catalyst, for determining action in the case of described high-tension circuit generation phase fault and electric current are less than failure current thresholds at described comprehensive protector according to the three-phase current detected；And
Fuse, for determining action in the case of described high-tension circuit generation phase fault and electric current are more than or equal to failure current thresholds at described comprehensive protector according to the three-phase current detected.
System the most according to claim 1, it is characterised in that this system also includes:
Phase-lacking protective device, is connected to the outfan of described comprehensive protector, for action in the case of described comprehensive protector determines described high-tension circuit generation phase-deficient operation according to the three-phase current detected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620198497.7U CN205595755U (en) | 2016-03-15 | 2016-03-15 | High -voltage circuit relaying protection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620198497.7U CN205595755U (en) | 2016-03-15 | 2016-03-15 | High -voltage circuit relaying protection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108666971A (en) * | 2018-05-17 | 2018-10-16 | 安徽亚智电气有限公司 | Overvoltage protection control system |
| CN112736846A (en) * | 2019-10-28 | 2021-04-30 | 株洲中车机电科技有限公司 | Integrated mutual inductor with leakage protection and zero sequence protection functions and application method |
-
2016
- 2016-03-15 CN CN201620198497.7U patent/CN205595755U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108666971A (en) * | 2018-05-17 | 2018-10-16 | 安徽亚智电气有限公司 | Overvoltage protection control system |
| CN112736846A (en) * | 2019-10-28 | 2021-04-30 | 株洲中车机电科技有限公司 | Integrated mutual inductor with leakage protection and zero sequence protection functions and application method |
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