CN102222886A - Protection device and method for high-voltage vacuum power distribution equipment for mining - Google Patents
Protection device and method for high-voltage vacuum power distribution equipment for mining Download PDFInfo
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- CN102222886A CN102222886A CN2011101713017A CN201110171301A CN102222886A CN 102222886 A CN102222886 A CN 102222886A CN 2011101713017 A CN2011101713017 A CN 2011101713017A CN 201110171301 A CN201110171301 A CN 201110171301A CN 102222886 A CN102222886 A CN 102222886A
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Abstract
The invention provides a protection device and a protection method for high-voltage vacuum power distribution equipment for mining. The protection device comprises a voltage transformer, a current transformer, a signal conditioning circuit, a microprocessor and a circuit breaker operating mechanism, wherein the voltage transformer and the current transformer respectively collect a voltage signal and a current signal from a power system and transfer the signals to the microprocessor through the signal conditioning circuit; and the microprocessor processes the signals, makes comparisons between the signals and a threshold and controls the working condition of the circuit breaker operating mechanism according to the comparison results. The invention uses a microcontroller program to determine the typical characteristic of transient phenomena of various faults so as to reasonably adjust the delaying time of trip; and meanwhile, the originally simple time-delay device for voltage-loss protection can be replaced and the delayed action time can be dynamically adjusted, so the high-voltage switchgear can avoid instant power failure or vibration of the power system and can normally protect without influences on failed loads.
Description
Technical field
The invention belongs to high pressure vacuum power distribution protection field, particularly a kind of mining high-voltage vacuum power distribution protection device and method.
Background technology
In the underground power supply system of colliery, because network is huge, user distribution is multi-point and wide-ranging, very easily produces short circuit or over current fault, after breaking down, and the action of the short-circuit protection in this loop, excision fault loop.Occur to fault clearing time from fault and be about 200ms～1s; line voltage recovers the normal time and may surpass 1s; during this period; other normal loop voltage can be fallen temporarily; and the high-tension switch cabinet integrated protection in every loop all is provided with the no-voltage trip device, when receiving the decompression signal, generally promptly carries out the decompression tripping operation instantaneous in 1s; cause large tracts of land circuit dead electricity, influence the stable operation of colliery electric power system.
At present; the processing method of in the underground power supply system of colliery electrical network rolling electrical phenomena being taked commonly used is to install time-delay relay behind no-voltage release additional; but because the delay time of time-delay relay can't be adjusted in real time; and the supply network under the coal mine is often because the progress of working face changes; if the delay time to time-delay relay does not in time adjust, the deferred action protection does not just play effect.In addition, formulated the relevant international standard of voltage dip according to IEEE and IEC: IEEE Std 1159-1995 and IEC 61000-2-8(2002-11), voltage dip, voltage dip and interruption are to be caused by conduction type low frequency phenomenon, must go to be judged that this all is that common time-delay relay can't be finished according to the spectrum signature of voltage disturbance, duration, amplitude variation etc.
Summary of the invention
Can't to adjust in real time electrical network decompression state in order solving in the underground power supply system of existing colliery, to the invention provides a kind of mining high-voltage vacuum power distribution protection device and method.
In order to achieve the above object; the present invention is by the following technical solutions: a kind of mining high-voltage vacuum power distribution protection device; described device comprises voltage transformer, current transformer, signal conditioning circuit, microprocessor, circuit breaker operation mechanism; described voltage transformer summation current transformer is gathered the voltage and current signal of electrical network respectively; and pass to microprocessor by signal conditioning circuit; described microprocessor is handled signal and is compared with threshold value, and microprocessor is controlled the operating state of circuit breaker operation mechanism according to comparative result.
Preferably, described microprocessor is a single-chip microcomputer.
Preferably, described single-chip microcomputer is controlled circuit breaker operation mechanism by control circuit, is provided with storage capacitor in the described control circuit.
Preferably, described single-chip microcomputer carries out threshold decision to acquired signal, determines the deferred action and the deferred action time of circuit breaker operation mechanism according to judged result.
The present invention also provides a kind of guard method of mining high-voltage vacuum distribution equipment, and described method comprises the steps,
(1) the voltage transformer summation current transformer is gathered the voltage and current signal of electrical network respectively;
(2) signal that step (1) is gathered passes to microprocessor by signal conditioning circuit;
(3) microprocessor is handled this signal, compares with preset threshold, according to comparative result, controls the deferred action and the deferred action time of circuit breaker operation mechanism by Drive and Control Circuit.
Preferably, during circuit breaker operation mechanism deferred action, the microprocessor driven switching tube turn-offs, make circuit breaker operation mechanism keep attracting state by the storage capacitor energy, between time delay in, normal as power system restoration, single-chip microcomputer is driving switch pipe closure again, promptly keep normal "on" position, still do not recover normal later as time-delay, the circuit breaker operation mechanism action divides deenergizing.
The present invention is delivered to the single-chip microcomputer processing by the voltage and current signal of gathering in the electrical network, determines whether deferred action and delay time according to threshold decision, carries out precision maneuver by the control circuit breaker operation mechanism.The present invention utilizes Single Chip Microcomputer (SCM) program to judge " characteristic feature of transition effect " of various faults; thereby rationally adjust the tripping operation delay time; the no-voltage protection device that replaces original simple time-delay; the dynamic adjustment deferred action time; make high-tension switch cabinet can avoid electrical network instantaneous power-down or shake, the normal protection when not influencing load faulty again.
Description of drawings
Fig. 1 is the schematic diagram of an embodiment of the present invention;
Fig. 2 is the scheme of installation of a kind of embodiment of invention.
1, intelligent no-voltage trip compensator 2, voltage transformer; 3, vacuum switch tube; 4, current transformer; 5, binding post; 6, circuit breaker operation mechanism; 7, insulated tension pole.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
Be illustrated in figure 1 as a kind of embodiment of the present invention, this device comprises voltage transformer, current transformer, signal conditioning circuit, microprocessor, circuit breaker operation mechanism, wherein: the voltage transformer summation current transformer is gathered the voltage and current signal of electrical network respectively, and pass to microprocessor by signal conditioning circuit, microprocessor is handled signal and is compared with threshold value, and microprocessor is controlled the operating state of circuit breaker operation mechanism (actuator among Fig. 1 is the permanent-magnet breaker operating mechanism) according to comparative result.The present invention utilizes Single Chip Microcomputer (SCM) program to judge " characteristic feature of transition effect " of various faults, thereby rationally adjusts the tripping operation delay time, makes high-tension switch cabinet can avoid electrical network instantaneous power-down or shake, the normal protection when not influencing load faulty again.
Single-chip microcomputer of the present invention is controlled circuit breaker operation mechanism by control circuit, is provided with storage capacitor in control circuit.Circuit breaker operation mechanism is connected with vacuum switch tube by insulated tension pole, and single-chip microcomputer comes the control switch pipe to open and close by drive circuit.In power supply just often, the conducting of Micro Controller Unit (MCU) driving switching tube is to the electric capacity energy storage of charging.When needing delay cut-off, the Micro Controller Unit (MCU) driving switching tube turn-offs, and the electric capacity energy stored acts on the switching winding, makes circuit breaker operation mechanism keep attracting state, delay time is dynamically adjusted by single-chip microcomputer, in between time delay, normal as power system restoration, single-chip microcomputer is driving switch pipe closure again, promptly keep normal "on" position, still do not recover later normal as time-delay, promptly belong to higher level's fault and jump electricity, the circuit breaker operation mechanism action divides deenergizing.Under-voltage delay time stepping of the present invention is adjustable, and preferred differential is 500ms, and adjustable extent is wide, and when the time is set to 0s, is instantaneous trip.
When single-chip microcomputer of the present invention is handled acquired signal, can adopt threshold decision method commonly used, by acquired signal and threshold value being carried out size relatively, thereby determine whether circuit breaker operation mechanism delays time and delay time.Preferably, adopt improvement algorithm, but utilize wavelet algorithm in sampling process, to detect suspect signal, carry out effective value by fft algorithm and judge,, get back to and continue to seek the sampling suspicious points in the wavelet algorithm if do not surpass threshold value based on wavelet analysis and FFT; If effective value surpasses threshold value, think that then suspicious points is effective, export respective drive signal according to protective condition by single-chip microcomputer.
As shown in Figure 2, for inventing the scheme of installation of a kind of embodiment, intelligence no-voltage trip compensator 1 comprises single-chip microcomputer, it is fixed on the frame of circuit breaker operation mechanism 6, circuit breaker operation mechanism 6 separates by the contact of insulated tension pole 7 with vacuum switch tube 3, voltage transformer 2 is installed in the top of circuit breaker operation mechanism 6, and current transformer is installed in the back of binding post 5.Intelligence no-voltage trip compensator 1 drives circuit breaker operation mechanism 6 by control circuit and carries out deferred action and delay time.Wherein: voltage transformer 1 summation current transformer is gathered the signal of the voltage and current in the electrical network, and signal is transferred in the control circuit of intelligent no-voltage trip compensator, is provided with storage capacitor in the control circuit.Single-chip microcomputer is judged the characteristic feature of voltage transient phenomenon according to duration and voltage magnitude, thereby determines whether deferred action and the deferred action time of actuator.The characteristic feature of voltage transient phenomenon can be with reference to IEEE Std 1159-1995 standard, according to the spectrum signature that comprises voltage disturbance, duration, amplitude variation etc., electric power system typical electromagnetic interference phenomenon has been carried out tagsort, and (wherein the exemplary voltages amplitude is a benchmark with the power supply buses rated voltage, numeral is a coefficient), table 1 is a kind of transition effect classification of the present invention and characteristic feature.
Classification of table 1 voltage transient phenomenon and characteristic feature
Preferably,, also to calculate the size of three-phase shortcircuit electric current in order to judge short-circuit conditions, if judge it is short circuit phenomenon, then tripping operation immediately.According to above method, single-chip microcomputer judges when needing delay cut-off that Micro Controller Unit (MCU) driving switching tube 3 turn-offs, the electric capacity energy stored acts on the switching winding, make circuit breaker operation mechanism keep attracting state, delay time is dynamically adjusted by single-chip microcomputer, between time delay in, normal as power system restoration, single-chip microcomputer is driving switch pipe closure again, promptly keeps normal "on" position, does not still recover normal later as time-delay, promptly belong to higher level's fault and jump electricity, the circuit breaker operation mechanism action divides deenergizing.
The present invention also provides a kind of guard method of mining high-voltage vacuum distribution equipment, and this method comprises the steps,
(1) the voltage transformer summation current transformer is gathered the voltage and current signal of electrical network respectively;
(2) signal that step (1) is gathered passes to microprocessor by signal conditioning circuit;
(3) microprocessor is handled this signal, compares with preset threshold, according to comparative result, controls the deferred action and the deferred action time of circuit breaker operation mechanism by Drive and Control Circuit.
Single-chip microcomputer is judged the characteristic feature of voltage transient phenomenon according to duration and voltage magnitude, thereby determines circuit breaker operation mechanism whether deferred action and deferred action time.When single-chip microcomputer is handled acquired signal, can adopt threshold decision method commonly used, by acquired signal and threshold value being carried out size relatively, thereby determine whether circuit breaker operation mechanism delays time and delay time.Preferably, adopt improvement algorithm, but utilize wavelet algorithm in sampling process, to detect suspect signal, carry out effective value by fft algorithm and judge,, get back to and continue to seek the sampling suspicious points in the wavelet algorithm if do not surpass threshold value based on wavelet analysis and FFT; If effective value surpasses threshold value, think that then suspicious points is effective, export respective drive signal according to protective condition by single-chip microcomputer.
It should be noted that at last: the above only is the explanation embodiments of the present invention; be not limited to the present invention; for a person skilled in the art; within the spirit and principles in the present invention all; any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the protective device of a mining high-voltage vacuum distribution equipment; it is characterized in that: described device comprises voltage transformer, current transformer, signal conditioning circuit, microprocessor, circuit breaker operation mechanism; described voltage transformer summation current transformer is gathered the voltage and current signal of electrical network respectively; and pass to microprocessor by signal conditioning circuit; described microprocessor is handled signal and is compared with threshold value, and microprocessor is controlled the operating state of circuit breaker operation mechanism according to comparative result.
2. the protective device of mining high-voltage vacuum distribution equipment according to claim 1 is characterized in that: described microprocessor is a single-chip microcomputer.
3. the protective device of mining high-voltage vacuum distribution equipment according to claim 2 is characterized in that: described single-chip microcomputer is controlled circuit breaker operation mechanism by control circuit, is provided with storage capacitor in the described control circuit.
4. the protective device of mining high-voltage vacuum distribution equipment according to claim 3 is characterized in that: described single-chip microcomputer carries out threshold decision to acquired signal, determines the deferred action and the deferred action time of circuit breaker operation mechanism according to judged result.
5. the guard method of a mining high-voltage vacuum distribution equipment is characterized in that: described method comprises the steps,
(1) the voltage transformer summation current transformer is gathered the voltage and current signal of electrical network respectively;
(2) signal that step (1) is gathered passes to microprocessor by signal conditioning circuit;
(3) microprocessor is handled this signal, compares with preset threshold, according to comparative result, controls the deferred action and the deferred action time of circuit breaker operation mechanism by Drive and Control Circuit.
6. the protective device of mining high-voltage vacuum distribution equipment according to claim 5; it is characterized in that: during circuit breaker operation mechanism deferred action; the microprocessor driven switching tube turn-offs; make circuit breaker operation mechanism keep attracting state by the storage capacitor energy, between time delay in, normal as power system restoration; single-chip microcomputer is driving switch pipe closure again; promptly keep normal "on" position, still do not recover normal later as time-delay, the circuit breaker operation mechanism action divides deenergizing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101713017A CN102222886A (en) | 2011-06-23 | 2011-06-23 | Protection device and method for high-voltage vacuum power distribution equipment for mining |
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| CN2011101713017A CN102222886A (en) | 2011-06-23 | 2011-06-23 | Protection device and method for high-voltage vacuum power distribution equipment for mining |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354960A (en) * | 2011-09-28 | 2012-02-15 | 陈和娟 | Mine high-voltage vacuum power distribution protecting apparatus and control method |
| CN102646966A (en) * | 2012-05-04 | 2012-08-22 | 清华大学 | Three-phase fault processing method of distributing line |
| CN107681779A (en) * | 2017-09-06 | 2018-02-09 | 河南省三禾电气有限公司 | One or two fusion high-pressure vacuum breakers and its monitoring method, system |
| CN108258663A (en) * | 2017-12-29 | 2018-07-06 | 河南北瑞电子科技有限公司 | A kind of high-tension switch cabinet protection system to earth |
| CN108270204A (en) * | 2016-12-30 | 2018-07-10 | 天津市中力神盾电子科技有限公司 | Power distribution protection system, method, controller switching equipment and distribution system |
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| JPH08196040A (en) * | 1995-01-13 | 1996-07-30 | Toshiba Corp | Distribution power supply system |
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| CN1604418A (en) * | 2004-11-04 | 2005-04-06 | 河北工业大学 | Automatic tracking protector for earth leakage and operation method thereof |
| CN101741061A (en) * | 2008-11-24 | 2010-06-16 | 射阳伟龙电气有限公司 | Distribution transformer medium voltage low voltage integration protection method |
| CN101814714A (en) * | 2009-02-21 | 2010-08-25 | 湖北盛佳电器设备有限公司 | Load control circuit breaker with circuit abnormal detection function |
| CN202094616U (en) * | 2011-06-23 | 2011-12-28 | 周庆生 | Protective device for mining high voltage vacuum distribution device |
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2011
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Patent Citations (6)
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| JPH08196040A (en) * | 1995-01-13 | 1996-07-30 | Toshiba Corp | Distribution power supply system |
| CN2270306Y (en) * | 1996-08-27 | 1997-12-10 | 刘亚南 | Sectionalizer for distribution line |
| CN1604418A (en) * | 2004-11-04 | 2005-04-06 | 河北工业大学 | Automatic tracking protector for earth leakage and operation method thereof |
| CN101741061A (en) * | 2008-11-24 | 2010-06-16 | 射阳伟龙电气有限公司 | Distribution transformer medium voltage low voltage integration protection method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354960A (en) * | 2011-09-28 | 2012-02-15 | 陈和娟 | Mine high-voltage vacuum power distribution protecting apparatus and control method |
| CN102646966A (en) * | 2012-05-04 | 2012-08-22 | 清华大学 | Three-phase fault processing method of distributing line |
| CN102646966B (en) * | 2012-05-04 | 2015-03-04 | 清华大学 | Three-phase fault processing method of distributing line |
| CN108270204A (en) * | 2016-12-30 | 2018-07-10 | 天津市中力神盾电子科技有限公司 | Power distribution protection system, method, controller switching equipment and distribution system |
| CN107681779A (en) * | 2017-09-06 | 2018-02-09 | 河南省三禾电气有限公司 | One or two fusion high-pressure vacuum breakers and its monitoring method, system |
| CN108258663A (en) * | 2017-12-29 | 2018-07-06 | 河南北瑞电子科技有限公司 | A kind of high-tension switch cabinet protection system to earth |
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Application publication date: 20111019 |