CN101442202A - Rapid protection device for indoor cable head - Google Patents
Rapid protection device for indoor cable head Download PDFInfo
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- CN101442202A CN101442202A CNA2008102365372A CN200810236537A CN101442202A CN 101442202 A CN101442202 A CN 101442202A CN A2008102365372 A CNA2008102365372 A CN A2008102365372A CN 200810236537 A CN200810236537 A CN 200810236537A CN 101442202 A CN101442202 A CN 101442202A
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Abstract
The invention discloses a quick protection device for indoor cable heads. The device comprises a single chip microcomputer, wherein a power circuit is connected with the single chip microcomputer, and the power circuit and the single chip microcomputer are connected with a current collection circuit, a sensor circuit, a clock circuit, an input/output interface circuit, a setting-button and buzzer circuit, a status indicating circuit, an RS485 communication circuit, a relay output circuit and a display circuit respectively. The device has the advantages that the device can quickly cut off feeder cabinet faults within 7 milliseconds, reduces fault spreading range, improves system stability, protects personnel safety, alleviates the damaged conditions of cables, circuit breakers, switch cabinets and other equipment, can prolong the service life of primary equipment so as to save cost, and greatly shortens fault treatment time, so as to guarantee the quick restoration of power supply and the quick start of production.
Description
Technical field
The present invention relates to power relay protection device, particularly rapid protection device for indoor cable head.
Prior art
Protection to cable end, cable mainly is to finish by the quick-break in the Integrated Protection System, overcurrent protection and zero-sequenceprotection now.
Fast tripping protection is the protection that is provided with at short circuit; the current value that it is provided with is the current value that is calculated according to behind system's generation single-phase short circuit or the phase fault; the set point ordinary circumstance is very big; 7～10 times of rated current that the chances are, in the time of cable generation insulation damages, its fault current is very little; when developing into big electric current; fast tripping protection just moves, but this moment, the cable end fault enlarged, and accident also enlarges.So it can not well protect cable end.
Overcurrent protection and zero-sequenceprotection are the protections that present switch cubicle must be equipped with; these two kinds of protections all are by after detecting feeder current; signal is sent in the comprehensive protector; comprehensive protector sends trip command according to the parameter that sets; because they are not to protect at the short circuit of cable; so fault clearing time is long; time is between 300ms～1.2s; so just caused cable end after puncture taking place and progressively develop into arc short-circuit; grievous injury to cable end even short-circuiting device and switch cubicle causes being interrupted the prolongation of production time.
Above in sum scheme all can not effectively be protected equipment such as cable end, circuit breaker, switch cubicle.
Summary of the invention
The object of the invention is to overcome above-mentioned prior art deficiency, a kind of rapid protection device for indoor cable head is provided, this device can be with the time fast shut-off feeder line cabinet fault of 7ms, dwindle fault and involve scope, improve the stability of a system, the protection personal safety alleviates device damage degree such as cable, circuit breaker and switch cubicle; Can prolong the life-span of primary equipment, to reach the purpose of saving cost; Shorten fault handling time simultaneously greatly.To guarantee the restoring electricity quick startup of production fast.
Technical scheme of the present invention is achieved in that
Power circuit of the present invention is connected with single-chip microcomputer, power circuit is connected the current acquisition circuit again respectively with single-chip microcomputer, sensor circuit, clock circuit, input, output interface circuit are provided with button and buzzer circuit, condition indication circuit, the RS485 communicating circuit, relay output circuit, display circuit.
Behind described current acquisition circuit zero-sequence current or three-phase current A, the B end input process instrument transformer T by binding post PAD_I, at instrument transformer T two ends and a resistance R 5, wherein after resistance R 8 of an end string,, electric current is sent into the AD of single-chip microcomputer with the other end and a capacitor C 15.
Socket J1 the 1st pin of described sensor circuit is connected with diode D2, and crus secunda is connected with diode D3, and VCC connects with resistance R 1, wherein one the tunnel with meet ISOGND after capacitor C 1, voltage-stabiliser tube D5 are connected, capacitor C 1 is in parallel with voltage-stabiliser tube D5; VCC connects with silicon photocell DS1, wherein one the tunnel with resistance R 5 series connection ISOGND, another road connects integrated circuit U1A end of oppisite phase; VCC gives integrated circuit U1A power supply; VCC with meet triode Q1 after parallel resistance R2, R3, R5 connect, meet ISOGND at last.
Behind the zero-sequence current of described current acquisition circuit or three-phase current the special accurate instrument transformer T of A, B end input process by binding post PAD_I, at instrument transformer T two ends and a resistance R 5, wherein after resistance R 8 of an end string, with the other end and a capacitor C 15, electric current I is sent into the AD of single-chip microcomputer.
The 2nd pin connecting resistance R2 of described single-chip microcomputer U5 and capacitor C 6 formed electrify restoration circuits, wherein the positive VCC of 5V power supply with connect single-chip microcomputer U5 crus secunda after resistance R 2 is connected, wherein 5V power supply ground GND with connect single-chip microcomputer U5 crus secunda after capacitor C 6 is connected; Single-chip microcomputer U5 the 57th, 58 pin connecting resistance R12, resistance R 11, crystal oscillator Y3, capacitor C 25, capacitor C 26 are formed crystal oscillating circuit; Single-chip microcomputer U5 4-7 pin connects clock circuit; The 8-12 pin connects button and buzzer circuit is set; 13-15,63-64 pin connect the RS485 communicating circuit; The 25-33 pin connects condition indication circuit, wherein also relay output circuit of U5 28-33 pin; Single-chip microcomputer U5 34-48 pin connects display circuit; Single-chip microcomputer U5 23-24 pin connects the arclight sensor circuit.
Described single-chip microcomputer U5 model is MC9S08AW32CFUE.
Be 7ms the operate time of rapid protection device for indoor cable head of the present invention; the short trouble mute time to feeder assembly can be controlled in the 85ms; to guarantee that cable end, short-circuiting device, switch cubicle are not burnt; breakdown loss can be dropped to minimum, for the putting into operation fast once more of equipment, resuming production creates conditions.
Description of drawings
Fig. 1 is a current acquisition circuit diagram of the present invention;
Fig. 2 is sensor circuit figure of the present invention;
Fig. 3 is relay output circuit figure of the present invention;
Fig. 4 is single chip circuit figure of the present invention;
Fig. 5 is circuit connecting relation figure of the present invention;
Fig. 6 is a cable end protection system schematic diagram of the present invention;
Below in conjunction with accompanying drawing content of the present invention is described in further detail.
Embodiment
During arclight host work of the present invention, can show the clock from clock circuit, from the electric current of current acquisition circuit, the main frame run indicator also can be glimmered.The arclight host SCM collect from the arc optical signal of arc light circuit and from the electric current of current acquisition circuit when the maximum current that button is provided with is set, can be according to the operating criterion that button sets is set, trigger corresponding output relay action, corresponding status indicator lamp Chang Liang, central control system is passed in communication through RS485 simultaneously, when fault is eliminated, can eliminate warning by button is set, indicator light, output relay return to main frame state just often.
Know-why of the present invention is by the over-current signal of arc optical signal in the collection cable vault and circuit and carries out analyzing and processing, meanwhile sends trip command, cuts off the feeder line circuit breaker.
The present invention is by electric current and arc optical signal acquisition system acquired signal reliably, through signal processing system the signal of gathering is analyzed, handled then, come disengagement failure with time output trip signal to circuit breaker through relay again less than 7ms, meanwhile communication system is given background computer with all data upload, in order to filing, analyzing.
With reference to shown in Figure 1, zero-sequence current or three-phase current by the input of A, the B of binding post PAD_I end through behind the special accurate instrument transformer T, at instrument transformer T two ends and a resistance R 5, wherein after resistance R 8 of an end string, with the other end and a capacitor C 15, electric current I is sent into the AD. of single-chip microcomputer
Circuit theory: zero-sequence current or three-phase current convert little current signal to and convert voltage signal to through after the resistance R 8 through through behind the special accurate instrument transformer T, send into single-chip microcomputer through filtering at last.
With reference to shown in Figure 2, the D2 (representing) 2.54 white socket J1 the 1st pin is connected with diode with meeting VCC, after crus secunda is connected with diode D3 (representing) with meeting ISOGND, VCC connects with resistance R 1, wherein one the tunnel with meet ISOGND (this road provides reference voltage mainly for integrated circuit U1A in-phase end) after capacitor C 1, voltage-stabiliser tube D5 (C1 and D5 parallel connection) are connected; VCC connects with silicon photocell DS1, wherein one the tunnel with resistance R 5 series connection ISOGND, another road connects integrated circuit U1A end of oppisite phase (this road is mainly used to receive light); VCC gives integrated circuit U1A (being equivalent to a comparator in circuit) power supply; VCC with meet triode Q1 after parallel resistance R2, R3, R5 connect, meet ISOGND at last.
Circuit theory: after silicon photocell DS1 receives light, with triode Q1 conducting, send a current signal, convert voltage signal to by resistance at last, provide signal to single-chip microcomputer by 2.54 white socket J1 by integrated circuit U1A (comparator).
With reference to shown in Figure 3, the single-chip microcomputer pin meets photoisolator (abbreviation optocoupler) U9 after by resistance R 4, optocoupler U9 crus secunda welding system ground (5V), 24V (ISO24V) power supply is just connecing the 4th pin of optocoupler U9 and is being connected with triode Q4, optocoupler U9 tripod one end with connect 24V ground (ISOGND), the base stage of another termination triode after resistance R 10 is connected; The emitter of triode links to each other with special quick relay coil one end, and the coil other end links to each other with 24V ground (ISOGND).
Circuit theory: single-chip microcomputer receives information, when needing to drive relay output, exports a high level process resistance R 4 with the photoisolator conducting, and drives the triode conducting, drives the special relay action at last.
With reference to shown in Figure 4, the 2nd pin connecting resistance R2 of single-chip microcomputer U5 and capacitor C 6 (wherein the positive VCC of 5V power supply with connect single-chip microcomputer U5 crus secunda after resistance R 2 is connected, wherein 5V power supply ground GND with connect single-chip microcomputer U5 crus secunda after capacitor C 6 is connected) the composition electrify restoration circuit; Single-chip microcomputer U5 the 57th, 58 pin connecting resistance R12, resistance R 11, crystal oscillator Y3, capacitor C 25, capacitor C 26 are formed crystal oscillating circuit; Single-chip microcomputer U5 4-7 pin connects clock circuit; Single-chip microcomputer U5 8-12 pin connects button and buzzer circuit is set; Single-chip microcomputer U5 13-15,63-64 pin connect the RS485 communicating circuit; Single-chip microcomputer U5 25-33 pin connects condition indication circuit, wherein also relay output circuit of U5 28-33 pin; Single-chip microcomputer U5 34-48 pin connects display circuit; Single-chip microcomputer U5 23-24 pin connects the arclight sensor circuit.Wherein single-chip microcomputer U5 model is MC9S08AW32CFUE.
Circuit theory: single-chip microcomputer collects the information of each built-up circuit, carries out corresponding action according to the manner of execution that is provided with.Such as: single-chip microcomputer collects the stream information excessively behind zero-sequence current or each the phase current circuit, and after the arc light information of arclight transducer arc light Acquisition Circuit, according to the criterion that button is provided with is set, trigger corresponding output relay action, corresponding status indicator lamp Chang Liang, central control system is passed in communication through RS485 simultaneously.
With reference to shown in Figure 5, during the arclight host work, can show clock from clock circuit, from the electric current of current acquisition circuit, the main frame run indicator also can be glimmered.The arclight host SCM collect from the arc optical signal of arc light circuit and from the electric current of current acquisition circuit when the maximum current that button is provided with is set, can be according to the operating criterion that button sets is set, trigger corresponding output relay action, corresponding status indicator lamp Chang Liang, central control system is passed in communication through RS485 simultaneously, when fault is eliminated, can eliminate warning by button is set, indicator light, output relay return to main frame state just often.
With reference to shown in Figure 6, Q2 is higher level's circuit breaker, and Q1 is a cable feeder line circuit breaker, and Arc is an arc photosensor, and Current is a current transformer, and COM is the RS485 communication.Electric current arrives the outlet of cable end stube cable by higher level's circuit breaker Q 2 again to cable feeder line circuit breaker Q 1, and by the RS485 communication signal is passed to distant place Central Control Room.
Operation principle: the automatic detection of cable end protective device meeting electric current stream signal and arc optical signal are protected the safety of equipment such as cable cable end, circuit breaker, switch cubicle.When having detected over-current signal and arc optical signal; the cable end protective device can be according to its criterion that sets; carry out separating brake in 7ms internal trigger trip switch TRIP1 action, if the Q1 tripping, the cable end protective device can trigger tripping relay TRIP2 action tripping higher level switch Q1 at once.Can warning message be passed to distant place Central Control Room by the RS485 communication simultaneously.
When feeder line cabinet cable vault when arc short-circuit takes place; the present invention sends the safety of trip command with equipment such as protection personnel, cable end, circuit breaker, switch cubicles by automatic detected over-current signal and arc optical signal are analyzed, handled by tripping relay.
When cable end was short-circuited, electric current increased, and produced with arclight.Current signal (3 phase current signals or zero sequence current signal) is transformed into behind the 1A/5A from sub-access to plant of corresponding current input terminal and the current value that set through current transformer and carries out computing; Arclight is to collect by the arc photosensor that is installed in the cable vault to be transformed into current signal behind the light signal and to send device to through signal cable again, after device is handled comparison to the over-current signal that collects, arc optical signal by plug-in, the result is through installing the form output of inner tripping relay with dry contact, trip signal is serially connected in the circuit breaker trip loop, with tripping feeder line circuit breaker.Install relevant information simultaneously and upload to background computer by the communication fracture.
Claims (6)
1, rapid protection device for indoor cable head comprises single-chip microcomputer, it is characterized in that; power circuit is connected with single-chip microcomputer; power circuit is connected current acquisition circuit, sensor circuit, clock circuit again respectively with single-chip microcomputer; input, output interface circuit; button and buzzer circuit are set, condition indication circuit, RS485 communicating circuit; the relay output circuit, display circuit.
2, rapid protection device for indoor cable head according to claim 1; it is characterized in that; behind described current acquisition circuit zero-sequence current or three-phase current A, the B end input process instrument transformer T by binding post PAD_I; at instrument transformer T two ends and a resistance R 5; wherein after resistance R 8 of an end string; with the other end and a capacitor C 15, electric current is sent into the AD of single-chip microcomputer.
3, rapid protection device for indoor cable head according to claim 1, it is characterized in that, socket J1 the 1st pin of described sensor circuit is connected with diode D2, crus secunda is connected with diode D3, VCC connects with resistance R 1, wherein one the tunnel with meet ISOGND after capacitor C 1, voltage-stabiliser tube D5 are connected, capacitor C 1 is in parallel with voltage-stabiliser tube D5; VCC connects with silicon photocell DS1, wherein one the tunnel with resistance R 5 series connection ISOGND, another road connects integrated circuit U1A end of oppisite phase; VCC gives integrated circuit U1A power supply; VCC with meet triode Q1 after parallel resistance R2, R3, R5 connect, meet ISOGND at last.
4, rapid protection device for indoor cable head according to claim 1; it is characterized in that; behind the zero-sequence current of described current acquisition circuit or three-phase current the special accurate instrument transformer T of A, B end input process by binding post PAD_I; at instrument transformer T two ends and a resistance R 5; wherein after resistance R 8 of an end string; with the other end and a capacitor C 15, electric current I is sent into the AD of single-chip microcomputer.
5, rapid protection device for indoor cable head according to claim 1, it is characterized in that, the 2nd pin connecting resistance R2 of described single-chip microcomputer U5 and capacitor C 6 are formed electrify restoration circuit, wherein the positive VCC of 5V power supply with connect single-chip microcomputer U5 crus secunda after resistance R 2 is connected, wherein 5V power supply ground GND with connect single-chip microcomputer U5 crus secunda after capacitor C 6 is connected; Single-chip microcomputer U5 the 57th, 58 pin connecting resistance R12, resistance R 11, crystal oscillator Y3, capacitor C 25, capacitor C 26 are formed crystal oscillating circuit; Single-chip microcomputer U5 4-7 pin connects clock circuit; The 8-12 pin connects button and buzzer circuit is set; 13-15,63-64 pin connect the RS485 communicating circuit; The 25-33 pin connects condition indication circuit, wherein also relay output circuit of U5 28-33 pin; Single-chip microcomputer U5 34-48 pin connects display circuit; Single-chip microcomputer U5 23-24 pin connects the arclight sensor circuit.
6, rapid protection device for indoor cable head according to claim 1 is characterized in that, described single-chip microcomputer U5 model is MC9S08AW32CFUE.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102365372A CN101442202A (en) | 2008-12-30 | 2008-12-30 | Rapid protection device for indoor cable head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102365372A CN101442202A (en) | 2008-12-30 | 2008-12-30 | Rapid protection device for indoor cable head |
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| Publication Number | Publication Date |
|---|---|
| CN101442202A true CN101442202A (en) | 2009-05-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008102365372A Pending CN101442202A (en) | 2008-12-30 | 2008-12-30 | Rapid protection device for indoor cable head |
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| Country | Link |
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| CN (1) | CN101442202A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185289A (en) * | 2011-05-25 | 2011-09-14 | 重庆新世纪电气有限公司 | Bus coupler charging protection method and system |
| CN106802595A (en) * | 2016-12-23 | 2017-06-06 | 中国航天时代电子公司 | A kind of relay module of high security |
-
2008
- 2008-12-30 CN CNA2008102365372A patent/CN101442202A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185289A (en) * | 2011-05-25 | 2011-09-14 | 重庆新世纪电气有限公司 | Bus coupler charging protection method and system |
| CN102185289B (en) * | 2011-05-25 | 2013-07-24 | 重庆新世纪电气有限公司 | Bus coupler charging protection method and system |
| CN106802595A (en) * | 2016-12-23 | 2017-06-06 | 中国航天时代电子公司 | A kind of relay module of high security |
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Open date: 20090527 |