CN101039021A - Novel fault protection process for intelligent circuit breakers - Google Patents
Novel fault protection process for intelligent circuit breakers Download PDFInfo
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- CN101039021A CN101039021A CN 200710017309 CN200710017309A CN101039021A CN 101039021 A CN101039021 A CN 101039021A CN 200710017309 CN200710017309 CN 200710017309 CN 200710017309 A CN200710017309 A CN 200710017309A CN 101039021 A CN101039021 A CN 101039021A
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Abstract
The invention discloses a novel failure protection method for an intelligent breaker, whose detecting region contains static contact temperature of a low voltage breaker, and which establishes new whole section current protection time-current function table for the breaker to give corresponding motion time value to each group of current thereby guarantee that different failure current has different motion time; besides referring to the time-current characteristic curve, the static contact temperature is also considered, and the method determines the breaker motion time based on the two parameter about current and static contact temperature so as to realize the complex monitor for current/contact temperature; and the provided method firstly cyclically samples the current, in a large-to-small sequence for the key current, in an electric value unequal circulation detecting manner, and then samples the voltage and temperature once to make the monitoring time for current far more than the monitoring time for other electric values and non-electric values, thereby being able to detect the failure current more quickly. The invention can make the intelligent controller to have faster reflection speed, higher motion sensitivity, more perfect functions.
Description
Technical field
The invention belongs to electrician's electric energy technical field; relating to and be used for the novel fault protection process that circuit breaker adopted that power distribution and motor drag control in the electric power system, is in 1500Hz and the following product important application value to be arranged also in operating frequency simultaneously.
Background technology
Circuit breaker is the control important in the electric power system and the electric equipment of protection usefulness, and is of many uses.Conventional circuit breaker adopts usually has the protection to realize that long delay overcurrent release, short time delay overcurrent release, momentary excess current dropout and under voltage are threaded off of thrermostatic bimetal-plate release (being limited to plastic shell low voltage breaker), overcurrent trip and device for under-voltage releasing equipment.Along with development of technology, the intellectuality work of electrical equipment advances energetically, and novel circuit breaker intelligent controller, integrated automatic protection and intelligent motor control centre etc. constantly occurs.The protected mode of these intelligent controllers is still continued to use traditional sectional protection type when design at present; though proposed many new algorithms; yet still there are defectives such as algorithm complexity, the not enough science of action protection characteristic, non-contact temperature detection, do not given play to maximum advantage.
Summary of the invention
Defective or deficiency at the prior art existence; the objective of the invention is to; a kind of novel fault protection process of intelligent circuit breaker is provided; this method section current protection, the compound monitoring of electric current/contact temperature, the unequal cycle detection innovation of electric weight method is entirely introduced in the intelligent controller of intelligent circuit breaker, makes that the response speed of intelligent controller is faster, higher, the more perfect functions of action sensitivity.
In order to realize above-mentioned task, the present invention takes following technical solution:
A kind of novel fault protection process of intelligent circuit breaker is characterized in that:
Method one, set up the full section of circuit breaker current protection time-the current function table, by time-the current function table carries out rounding operation with electric current, allows each group electric current that corresponding value operate time is all arranged, assurance different faults electric current has different operate times;
Method two is considered the fixed contact temperature in reference time-current characteristics curve, determine circuit breaker operate time according to electric current and two parameters of fixed contact temperature, with the compound monitoring of realization electric current/contact temperature; Concrete grammar is, at the fixed contact back side of circuit breaker drilling blind hole, make blind hole until near the fixed contact surface, integrated temperature sensor is coated heat-conducting silicone grease imbed in the blind hole, make integrated temperature sensor and fixed contact keep well contacting, include the fixed contact temperature of low-voltage circuit breaker in detection range;
Method three, adopt the unequal cycle detection method of electric weight, at first electric current is carried out repeatedly circulating sampling, first big after small order is adopted in detection to the emphasis electric current, and then the method that voltage and temperature are once sampled, make monitoring period to electric current far more than monitoring period, thereby can detect fault current more rapidly other electric weight and non electrical quantity.
Above-mentioned three kinds of methods use separately or use in conjunction all can.
The novel fault protection process of intelligent circuit breaker disclosed by the invention is applicable to the intelligent circuit breaker that the power distribution of electric power system and motor is dragged control and protective effect, simultaneously the industry of taking particular job frequency is also had important application value.Can be widely used in the intelligent controller at all types of intelligent circuit breakers, integrated automatic protection and Electric Machine Control center, market to this series products in great demand, application prospect is very wide.Can improve the technical merit and the added value of relevant intelligent controller, bigger economic benefit is arranged.
Description of drawings
Fig. 1 is traditional three section protection characteristic curve and full segment protect characteristic curve contrast.Wherein, (a) traditional three section protection characteristic curve, (b) full segment protect characteristic curve is both correlation curves (c), I among the figure
R1Be long delay setting value, I
R2Be short time delay setting value, I
R3Be instantaneous setting value.
Need illustrate that when short circuit current reaches 12～16 times setting current, because there is intrinsic opening time in circuit breaker itself, therefore the characteristic curve after these electric currents occur will be a horizontal line, be (0.02～0.05) ± 5%s opening time.
Fig. 2 is the characteristic curve that adopts full segment protect;
Fig. 3 is full section current protection characteristic subprogram block diagram;
Fig. 4 is unequal electric weight cycle detection figure.
The present invention is described in further detail below in conjunction with accompanying drawing.
Embodiment
The novel fault protection process of intelligent circuit breaker of the present invention can be realized by hardware device and software programming mode; software all adopts assembler language to write; also available high level language; but the execute statement of the relative high level language of assembler language; have that efficient is higher, the time and space characteristic of accurate, simultaneously for the big electric current of circuit breaker collection and little electric current isoparametric poll time accurately control effective programmed environment is provided.
Following inventor provides the example of the specific implementation of three kinds of methods of the present invention.
1, the principle of full segment protect characteristic and subprogram design
Because conventional circuit breaker is limited to the restriction of volume and technology, adopt bimetal leaf, overcurrent trip and device for under-voltage releasing equipment protection usually to realize that long delay overcurrent release, short time delay overcurrent release, momentary excess current dropout and under voltage are threaded off with thermal effect.At present, intelligent breaker is still continued to use the sectional protection type of conventional circuit breaker when the design protection characteristic curve, and has proposed many complicated algorithm, though on multinomial performance, surpassed conventional circuit breaker, do not given play to own maximum advantage.
Such as: in the algorithm of design overload long delay,, just be difficult to solve as a following problem with occurring because of overload current is not invariable.
If initial overload current is I
1, the time-delay of its correspondence is t
1Through t (t＜t after a while
1) after, electric current has changed to I
2(I
2＜I
1), then corresponding delay time will become t
2Just should consider the influence of initial overload current I1 if will control circuit breaker tripping this moment, and delay time should be less than t
2If electric current changes repeatedly, reach comparatively the ideal control very difficulty that will become, and can consume a large amount of MCU resources.
For another example: intelligent circuit breaker is indiscriminately imitated the sectionalised protection characteristic curve when the control mode of design short circuit short time delay, allows multiple short circuit current corresponding same operate time (shown in a of Fig. 1).We know that different short circuit currents is different to the destruction of equipment, and it is also different that electrical equipment can bear the time of different faults electric current, therefore not necessarily uses identical action delay faster.
Conventional circuit breaker is subjected to technical limitations, can only accomplish the syllogic current protection, and the fault current that difference is bigger adopts identical operate time.The present invention by the settling time-the current function table; electric current is carried out rounding operation; allow each group electric current that corresponding value operate time is all arranged; thereby accomplish that the different faults electric current has different operate times; can reach control more accurately, thereby be different from present intelligent breaker follows the conventional circuit breaker sectionalised protection when the design protection characteristic curve way.
As shown in Figure 1, full section current protection is to propose at the short circuit short time delay shortcoming that delay time is identical under different short circuit currents, and countermeasure is to make the inverse time lag extend to the whole protecting zone, i.e. the operate time of the corresponding different delayed time of all fault currents.
Because the electronic circuit time exist to postpone, breaker open operation all needs the time with electromagnet or spring mechanism and contact from being separated into arc extinction, therefore cause and play circuit breaker from intelligent controller output sub-gate signal circuit is cut-off the inherent delay time that certainly exists.Thus, under certain short circuit current, can further not dwindle operate time again, and can be a definite time value.
2, the enforcement of " the compound monitoring of electric current/contact temperature "
Contact temperature rise is usually than the height of other current-carrying part.But if contact temperature is too high, strong oxidation and melting welding take place in contact-making surface easily, make the switch disablement.In addition, contact presses power indirectly and relies on spring to keep usually, and too high contact temperature will have a significant impact the rigidity of spring, easily produces spring under electrodynamic action, makes the contact job insecurity.Because the existence of contact resistance, short-circuit current is the variation of contact temperature to the most direct embodiment of influence of circuit and circuit breaker.If in the time-current characteristic analysis, introduce the contact temperature parameter will make control algolithm become simply, effective; can significantly reduce oxidation, erosion and the welding problems of contact, reach the contact that adequately protects, prolong the circuit breaker life-span, improve the purpose of its functional reliability.The present invention monitors contact temperature, can reduce the generation of above problem to greatest extent, having broken through traditional intelligence type circuit breaker only relies on electric current to finish the limitation of control and has avoided complicated algorithm, thereby make circuit breaker determine operate time, realized the compound monitoring of electric current/temperature according to temperature and two parameters of electric current.
As shown in Figure 2, characteristic curve adopts full segment protect, and the algorithm criterion is " an accumulative total thermal effect ", introduces temperature parameter simultaneously, determines operate time jointly by temperature and current parameters, thereby realizes comprehensive judgement.
The measurement of contact temperature and processing way: bore the blind hole of φ 5 at the fixed contact back side of circuit breaker, till near the fixed contact surface (can not be penetrating), integrated temperature sensor is coated heat-conducting silicone grease imbed in the hole, make it well to contact with contact.Because the working temperature limit of fixed contact is at+70～+ 105 ℃, therefore the measuring range of the semiconductor temperature element of selecting for use should satisfy-20～+ 120 ℃, because the fixed contact variations in temperature is a process comparatively slowly, so conversion speed and precision all have not a particular requirement.Should select the littler packaged type and the wideer voltage scope of application.The alarm temperature that resolution setting and user set can be stored in E
2Among the PROM, still preserve after the power down.
This method has following characteristics:
(1) each electric current all has the corresponding action time, and guard method is science more;
(2) can reduce oxidation, corrosion and the melting welding of contact, improve the reliability of circuit breaker;
(3) owing to the temperature rise of having considered fixed contact, in the long delay process, along with the fixed contact variation of temperature, can do corresponding adjustment operate time, even Fu Za variable-current again, by fixed contact temperature this " adjuster of intelligence ", it is very simple but very effective that programming all can become.
(4) calculating formula of temperature correction facotor:
In the formula: K---temperature correction facotor;
t
0---lay the place ambient temperature (℃);
t
1---the highest permission working temperature of conductor (℃)
t
2---the ambient temperature that adopted in the conductor ampacity standard (℃).
As the ambient temperature t that lays the place
0Ambient temperature t greater than conductor ampacity standard code employing
2The time K＜1, compare with standard, the electric current that allows to pass through will reduce, delay time and will shorten.
(5) the subprogram block diagram as shown in Figure 3.Earlier according to formula accounting temperature correction coefficient K; On-the-fly modify operate time by K value and current value again, table look-up and try to achieve the release deferred action time, and the return action time value.During routine processes, with the electric current I measured divided by temperature coefficient K after, current value and the set point that will amplify (dwindling) compare, and make judgement.
3, the enforcement of unequal circulation detection method of quantity of electricity
In order to guarantee the high request of intelligent circuit breaker to the real-time monitoring of electric current, the unequal cycle detection method of electric weight is meant the method that electric current is carried out repeatedly circulating sampling, voltage and temperature once sampled again taked earlier, can make monitoring period to electric current far more than monitoring period, thereby can more promptly detect fault current other electric weight and non electrical quantity.Simultaneously, also first big after small priority is adopted in the detection of electric current, with the appearance of timely discovery major accident.
The flow chart of unequal circulation detection method of quantity of electricity as shown in Figure 4.400A is an example with the circuit breaker rated operational current, comprises the steps:
At first start big current sample subprogram; And judge, at first judge whether greater than 50KA, if, promptly to carry out separating brake and handle and enter alert program, after warning was finished, the waiting system mistake resetted; If not, then entering and judge whether that greater than 800A if greater than 800A, then call the protective feature subprogram, the action of going forward side by side is done also to report to the police to the separating brake handling procedure behind the time set, after warning was finished, the waiting system mistake resetted;
If not, then entering and judge whether that greater than 400A if greater than 400A, then call the protective feature subprogram, the action of going forward side by side is done also to report to the police to the separating brake handling procedure behind the time set, after warning was finished, the waiting system mistake resetted; If not, whether then judge current detecting greater than 64 times, if do not reach the detection number, return big current sample subprogram, continue to repeat;
If reach the detection number, then enter voltage and adopt subprogram, judge whether voltage is normal, calls the protective feature subprogram if voltage is undesired, the action of going forward side by side is done also to report to the police to the separating brake handling procedure behind the time set, and after warning was finished, the waiting system mistake resetted; If voltage normally then enter the temperature sampling subprogram, judges whether temperature is normal, if temperature is normal, return big current sample subprogram, continue to repeat; If temperature is undesired, then enter separating brake handling procedure and warning, after warning was finished, the waiting system mistake resetted.
One of main monitoring electric weight of circuit breaker is an electric current, and wherein fault current is the most important.For reducing the shared system resource of other electric weight of monitoring, " the unequal circulation detection method of quantity of electricity " that the applicant proposes comprises the order that the detection of emphasis electric weight (electric current) is adopted earlier big electric current, the little electric current in back; Electric current is repeatedly being gathered primary voltage and contact temperature equivalence behind the circle collection again so that to the monitoring period of electric current far away more than time to other monitoring values, thereby more promptly detect fault current and it carried out fast reaction.
Technical characterstic and the advantage of method of the present invention are:
(1), utilizes full section current protection program to finish current signal is carried out the diagnosis and protection worker Do.
(2), introduce the time-current characteristic that temperature parameter is analyzed breaker, will make defencive function more Comprehensively.
(3), adopt unequal circulation detection method of quantity of electricity can take full advantage of system resource.
The novel fault protection process of intelligent circuit breaker disclosed by the invention is applicable to power system Power distribution and motor drag the intelligent circuit breaker of control and protective effect, simultaneously to taking the spy The industry of different operating frequency also has important actual application value. Can be widely used in all types of intelligent In the intelligent controller of breaker, integrated automatic protection and Motor Control Center, produce this type of in market Product in great demand, application prospect is very wide. Can improve relevant intelligent controller technical merit and Added value has bigger economic benefit.
Claims (2)
1. the novel fault protection process of an intelligent circuit breaker is characterized in that:
Method one, set up the full section of circuit breaker current protection time-the current function table, by time-the current function table carries out rounding operation with electric current, allows each group electric current that corresponding value operate time is all arranged, assurance different faults electric current has different operate times;
Method two is considered the fixed contact temperature in reference time-current characteristics curve, determine circuit breaker operate time according to electric current and two parameters of fixed contact temperature, with the compound monitoring of realization electric current/contact temperature; Concrete grammar is, at the fixed contact back side of circuit breaker drilling blind hole, make blind hole until near the fixed contact surface, integrated temperature sensor is coated heat-conducting silicone grease imbed in the blind hole, make integrated temperature sensor and fixed contact keep well contacting, include the fixed contact temperature of low-voltage circuit breaker in detection range;
Method three, adopt the unequal cycle detection method of electric weight, at first electric current is carried out repeatedly circulating sampling, first big after small order is adopted in detection to the emphasis electric current, and then the method that voltage and temperature are once sampled, make monitoring period to electric current far more than monitoring period, thereby can detect fault current more rapidly other electric weight and non electrical quantity;
Above-mentioned three kinds of methods use separately or use in conjunction all can.
2. the method for claim 1, the temperature sensor measurement scope in the described method two is-20 ℃～+ 120 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100173091A CN100530877C (en) | 2007-01-26 | 2007-01-26 | Novel fault protection process for intelligent circuit breakers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100173091A CN100530877C (en) | 2007-01-26 | 2007-01-26 | Novel fault protection process for intelligent circuit breakers |
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| Publication Number | Publication Date |
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| CN101039021A true CN101039021A (en) | 2007-09-19 |
| CN100530877C CN100530877C (en) | 2009-08-19 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102073001A (en) * | 2010-11-29 | 2011-05-25 | 江苏省电力公司溧阳市供电公司 | Method for locating fault point of operation failure of residual current protection device in low-voltage distribution line |
| CN102280321A (en) * | 2011-06-10 | 2011-12-14 | 上海电机学院 | Light load overheating protection breaker |
| CN103219696A (en) * | 2013-05-02 | 2013-07-24 | 深圳市力通威电子科技有限公司 | Overcurrent protection method and device |
| CN108333502A (en) * | 2018-01-15 | 2018-07-27 | 温州大学苍南研究院 | A method of measuring miniature circuit breaker operating temperature |
| CN109100030A (en) * | 2018-08-27 | 2018-12-28 | 宝钢湛江钢铁有限公司 | A kind of probe of contactor scaling loss monitoring method |
| CN110426624A (en) * | 2019-07-29 | 2019-11-08 | 西安西拓电气股份有限公司 | The appraisal procedure and device of circuit-breaker status |
| CN110912084A (en) * | 2018-09-17 | 2020-03-24 | 维谛技术有限公司 | Filter capacitor protection method and device and converter |
| CN111398659A (en) * | 2020-04-03 | 2020-07-10 | 一诺仪器（中国）有限公司 | Voltage and temperature measuring method |
| CN114812652A (en) * | 2022-04-20 | 2022-07-29 | 松灵机器人(深圳)有限公司 | Mower control method and device, mower and storage medium |
| CN115128442A (en) * | 2022-06-23 | 2022-09-30 | 国网福建省电力有限公司 | Dynamic evaluation method for electrical life of circuit breaker based on full-life operation information |
| WO2023061270A1 (en) * | 2021-10-15 | 2023-04-20 | 施耐德电器工业公司 | Overload protection method for solid-state circuit breaker, solid-state circuit breaker, and power distribution system |
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2007
- 2007-01-26 CN CNB2007100173091A patent/CN100530877C/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102073001A (en) * | 2010-11-29 | 2011-05-25 | 江苏省电力公司溧阳市供电公司 | Method for locating fault point of operation failure of residual current protection device in low-voltage distribution line |
| CN102073001B (en) * | 2010-11-29 | 2013-01-02 | 江苏省电力公司溧阳市供电公司 | Method for locating fault point of operation failure of residual current protection device in low-voltage distribution line |
| CN102280321A (en) * | 2011-06-10 | 2011-12-14 | 上海电机学院 | Light load overheating protection breaker |
| CN103219696A (en) * | 2013-05-02 | 2013-07-24 | 深圳市力通威电子科技有限公司 | Overcurrent protection method and device |
| CN103219696B (en) * | 2013-05-02 | 2016-04-06 | 深圳市力通威电子科技有限公司 | A kind of over-current protection method and device |
| CN108333502A (en) * | 2018-01-15 | 2018-07-27 | 温州大学苍南研究院 | A method of measuring miniature circuit breaker operating temperature |
| CN108333502B (en) * | 2018-01-15 | 2020-05-05 | 温州大学苍南研究院 | Method for measuring action temperature of miniature circuit breaker |
| CN109100030A (en) * | 2018-08-27 | 2018-12-28 | 宝钢湛江钢铁有限公司 | A kind of probe of contactor scaling loss monitoring method |
| CN110912084A (en) * | 2018-09-17 | 2020-03-24 | 维谛技术有限公司 | Filter capacitor protection method and device and converter |
| CN110912084B (en) * | 2018-09-17 | 2022-02-25 | 维谛新能源有限公司 | Filter capacitor protection method and device and converter |
| CN110426624A (en) * | 2019-07-29 | 2019-11-08 | 西安西拓电气股份有限公司 | The appraisal procedure and device of circuit-breaker status |
| CN111398659A (en) * | 2020-04-03 | 2020-07-10 | 一诺仪器（中国）有限公司 | Voltage and temperature measuring method |
| WO2023061270A1 (en) * | 2021-10-15 | 2023-04-20 | 施耐德电器工业公司 | Overload protection method for solid-state circuit breaker, solid-state circuit breaker, and power distribution system |
| CN114812652A (en) * | 2022-04-20 | 2022-07-29 | 松灵机器人(深圳)有限公司 | Mower control method and device, mower and storage medium |
| CN114812652B (en) * | 2022-04-20 | 2024-03-26 | 松灵机器人(深圳)有限公司 | Mower control method and device, mower and storage medium |
| CN115128442A (en) * | 2022-06-23 | 2022-09-30 | 国网福建省电力有限公司 | Dynamic evaluation method for electrical life of circuit breaker based on full-life operation information |
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| CN100530877C (en) | 2009-08-19 |
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