CN105891705A - Detection system of a circuit breaker - Google Patents
Detection system of a circuit breaker Download PDFInfo
- Publication number
- CN105891705A CN105891705A CN201610146630.9A CN201610146630A CN105891705A CN 105891705 A CN105891705 A CN 105891705A CN 201610146630 A CN201610146630 A CN 201610146630A CN 105891705 A CN105891705 A CN 105891705A
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- CN
- China
- Prior art keywords
- resistance
- modulate circuit
- outfan
- dsp chip
- current sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a detection system of a circuit breaker. The detection system is composed of a DSP chip, a first matching resistor, a second matching resistor, a first conditioning circuit, a second conditioning circuit, an upper computer, a first hall current sensor for detecting a current signal on an opening coil of the circuit breaker, and a second hall current sensor for detecting a current signal on a closing coil of the circuit breaker. The output terminal of the first hall current sensor is connected with one end of the first matching resistor and the input terminal of the first conditioning circuit; the output terminal of the second hall current sensor is connected with one end of the second matching resistor and the input terminal of the second conditioning circuit; the other end of the first matching resistor and the other end of the second matching resistor are grounded; and the output terminal of the first conditioning circuit and the output terminal of the second conditioning circuit are connected with the input terminal of the DSP chip. And the DSP chip is connected with the upper computer. With the detection system, a fault or a defect of a circuit breaker can be detected effectively.
Description
Technical field
The invention belongs to electronic device field of fault detection, relate to a kind of chopper detecting system.
Background technology
Primary cut-out is a kind of important electrical equipment in power system, and it is as cut-offfing and arc extinguishing
Device, it bear in power system control and protection dual role, be power plant and power transformation
Stand requisite equipment in power distribution equipment.Along with operation of power networks automaticity and reliability requirement
Raising, the research to its fault diagnosis technology has great importance.Chopper performance reliable
Property is directly connected to the reliability service of power system, and the reliability of chopper takes to a great extent
Certainly in the reliability of its machinery actuating system.Therefore the mechanical breakdown to chopper carries out diagnosing right and wrong
The most important, also it is to ensure that the important measures of safe operation of power system.The mechanical breakdown of chopper
Diagnosis can be completed by the multiple mechanical parameter of monitoring breaker.
Present stage, chopper defect or the fault of 60%-70% cause by breaker mechanism defect,
Including: mechanism's bite, oils and fats solidification, spring is aging, Slow-disconnecting and slow-connecting, link transmission axle fracture,
Mechanism's tripping etc..But the state inspection of conventional circuit breaker, as infrared drawn game is put (containing superelevation
Frequently, ultrasound wave, transient state ground electric wave) only for electro-contact defect and insulating element (medium) defect
Diagnosis, there is no effective state-detection means to breaker mechanism.
Summary of the invention
It is an object of the invention to the shortcoming overcoming above-mentioned prior art, it is provided that a kind of chopper inspection
Examining system, circuit breaker failure and defect can effectively be detected by this system.
For reaching above-mentioned purpose, chopper detecting system of the present invention include dsp chip,
One build-out resistor, the second build-out resistor, the first modulate circuit, the second modulate circuit, host computer,
For detecting the first Hall current sensor of the current signal on breaker open operation coil, Yi Jiyong
Second Hall current sensor of the current signal on detection breaker closing coil;
Electricity is nursed one's health in the outfan of the first Hall current sensor and one end of the first build-out resistor and first
The input on road is connected, the outfan of the second Hall current sensor and the one of the second build-out resistor
The input of end and the second modulate circuit is connected, the other end of the first build-out resistor and the second coupling
The equal ground connection of the other end of resistance, the outfan of the first modulate circuit and the outfan of the second modulate circuit
All being connected with the input of dsp chip, dsp chip is connected with host computer.
Described first modulate circuit and the second modulate circuit all include the first resistance, the second resistance,
Three resistance, diode, the first electric capacity, the second electric capacity and operational amplifier;
One end of first resistance is connected with one end of the positive pole of diode and the second resistance, the second electricity
The other end and one end of one end of the 3rd resistance and the first electric capacity of resistance are connected, the 3rd resistance another
One end is connected with one end of the second electric capacity and the inverting input of operational amplifier, the second electric capacity
Other end ground connection, the outfan of operational amplifier and the in-phase input end of operational amplifier and the first electricity
The other end held is connected;
The other end of the first resistance and the outfan of the first Hall current sensor in first modulate circuit
Being connected, in the first modulate circuit, the outfan of operational amplifier is connected with the input of dsp chip
Connecing, in the second modulate circuit, the other end of the first resistance and the outfan of the second Hall element are connected
Connecing, in the second modulate circuit, the outfan of operational amplifier is connected with the input of dsp chip.
First Hall current sensor and the second Hall element are compensation Hall element.
Also include that alarm module, alarm module are connected with the outfan of dsp chip.
The model of described operational amplifier is LM324N.
The method have the advantages that
Chopper detecting system of the present invention in use, by the first Hall current sensor
And second current signal that obtains in chopper on closing coil of Hall current sensor and switching winding
On current signal, then the current signal of described switching winding and the current signal of closing coil are turned
It is changed to voltage signal, enters in dsp chip after described voltage signal is conditioned, and at DSP core
Sheet carries out analog digital conversion, and the voltage signal after analog digital conversion is shown in host computer, user
It is right to be carried out by the voltage signal after analog digital conversion and the voltage signal collected when normally working
Ratio judges that chopper the most normally works, simple in construction, easy to operate.
Accompanying drawing explanation
Fig. 1 is the test philosophy figure of switching winding in the present invention;
Fig. 2 is the first modulate circuit 3 and circuit theory diagrams of the second modulate circuit in the present invention;
Fig. 3 is switching winding loop and the equivalent circuit diagram in closing coil loop;
Fig. 4 is the current characteristics oscillogram of switching winding and closing coil.
Wherein, 1 it is the first Hall current sensor, 2 is the first build-out resistor, 3 is the first conditioning
Circuit, 4 be dsp chip, 5 for host computer.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in further detail:
With reference to Fig. 1 and Fig. 2, chopper detecting system of the present invention include dsp chip 4,
First build-out resistor the 2, second build-out resistor, first modulate circuit the 3, second modulate circuit, upper
Machine 5, for detect current signal on breaker open operation coil the first Hall current sensor 1,
And for detecting the second Hall current sensor of the current signal on breaker closing coil;The
The outfan of one Hall current sensor 1 and one end of the first build-out resistor 2 and the first modulate circuit
The input of 3 is connected, the outfan of the second Hall current sensor and the one of the second build-out resistor
The input of end and the second modulate circuit is connected, the other end of the first build-out resistor 2 and second
The equal ground connection of the other end of distribution resistance, the outfan of the first modulate circuit 3 and the second modulate circuit defeated
Going out the end input all with dsp chip 4 to be connected, dsp chip 4 is connected with host computer 5.
Described first modulate circuit 3 and the second modulate circuit all include the first resistance R1, the second resistance
R2, the 3rd resistance R3, diode D, the first electric capacity C1, the second electric capacity C2 and operation amplifier
Device W;One end of first resistance R1 and the positive pole of diode D and one end phase of the second resistance R2
Connect, the other end of the second resistance R2 and one end of the 3rd resistance R3 and the one of the first electric capacity C1
End is connected, the other end of the 3rd resistance R3 and one end of the second electric capacity C2 and operational amplifier W
Inverting input be connected, the other end ground connection of the second electric capacity C2, operational amplifier W's is defeated
Go out end to be connected with the in-phase input end of operational amplifier W and the other end of the first electric capacity C1;The
The other end of the first resistance R1 and the output of the first Hall current sensor 1 in one modulate circuit 3
End is connected, the outfan of operational amplifier W and dsp chip 4 in the first modulate circuit 3
Input is connected, the other end of the first resistance R1 and the second hall sensing in the second modulate circuit
The outfan of device is connected, the outfan of operational amplifier W and DSP core in the second modulate circuit
The input of sheet 4 is connected.
It should be noted that the first Hall current sensor 1 and the second Hall element are compensation
Formula Hall element.Present invention additionally comprises the output of alarm module, alarm module and dsp chip 4
End is connected;The model of operational amplifier W is LM324N.
The operation principle of the present invention is:
Electric magnet is one of important original paper of breaker operation mechanism, when in coil by electric current,
Producing magnetic flux in electric magnet, iron core, by electromagnetic force adhesive, makes breaker open operation or combined floodgate,
Therefore chopper all produces switching winding current waveform and closing coil current waveform, the separating brake of correspondence
Coil current waveform and closing coil current waveform reflect electric magnet itself and the lock bolt controlled
Or valve and chain contact working condition in operation, wherein sub-gate circuit and closing a floodgate back
The solenoid circuit equivalent circuit diagram on road is as shown in Figure 3.
Its differential equation is represented by
Wherein, ψ is magnetic linkage, it is assumed that electric magnet is unsaturated, then magnetic linkage ψ=Li, inductance L is not
Change with i, but inductance L changes with the air gap delta of electric magnet and changes, i.e.
When solenoid is just switched on power supply, owing to coil has certain inductance, electric current can not reach at once
To stabling current, but being progressively gradually increased by 0, meanwhile, captivation unshakable in one's determination is the most gradually
Increasing, the captivation at electric magnet is not enough so that during action unshakable in one's determination, δ=δ max is constant, i.e. ferrum
The movement velocity of the heart is v=0, then formula (2) becomes:
Wherein, L1During for δ=δ max, the inductance of electromagnet coil, the general solution of the differential equation is:
Wherein, C is general solution constant, the initial condition of t=0 and i=0 obtain of the differential equation
Particular solution is
Therefore, before iron core moves, coil current i exponentially rises, at time t1Electric current increases
Big to action current Id, the suction of electric magnet exceedes counteracting force, setting in motion unshakable in one's determination, v > 0;Deng
Value loop increases a counter electromotive force increased overGenerally, coil current
I is than electric current I during firm setting in motion unshakable in one's determinationdNumerical value little, therefore, on electric current i deviation index
Rising curve, constantly decline, this process is until adhesive unshakable in one's determination, and stop motion unshakable in one's determination, v=0, by formula
(2), the differential equation of electric current becomes:
Wherein L2During for δ=δ min, the inductance of electromagnet coil, therefore electric current stops with iron core
T=t2Time electric current I2For initial value, exponentially rise, finally reach stationary valueOn
Stating change procedure can be with the typical divide-shut brake coil current characteristic waveforms explanation in Fig. 4, this waveform
5 stages can be divided into according to motion unshakable in one's determination:
L) stage t=t0-t1, coil is at t0Moment is energized to t1Moment iron core setting in motion;
2) stage t=t1-t2, motion unshakable in one's determination, electric current declines, t2For controlling the valley point of electric current, generation
The load of table actuating procedure unshakable in one's determination machinery thus noticeable deceleration or stop motion;
3) stage t=t2-t3, stop motion unshakable in one's determination, electric current the most exponentially rises;
4) stage t=t3-t4, this stage is the continuity in stage 3, and electric current reaches the stable state of approximation;
5) stage t=t4-t5, electric current cut-offs the stage, and auxiliary switch K disjunction is at auxiliary switch contact
Between produce electric arc being elongated, arc voltage quickly raises and forces electric current to decrease up to rapidly extinguishing.
Wherein, t0-t1Relevant with control power supply and coil resistance;t1-t2Change characterize electric magnet ferrum
Heart travelling mechanism is with or without bite, dropout and mechanical load change conditions;t2-t3Can reflect that operation passes
The situation of dynamic system motion;The most diagnosable chopper of analysis by above several different characteristic times
Some mechanical fault trend, including refusing point, refusing the faults such as conjunction.
The DC simulation signal of breaker open operation coil and closing coil is that I1 becomes through Hall element
Transformation becomes the current signal I2, I2 of 0~6mA to be converted into dsp chip 4 through build-out resistor
The voltage signal U that can accept0。U0Dsp chip 4 simulation input is passed to after modulate circuit
Passage, is carried out analog digital conversion by the A/D converter within dsp chip 4, then at host computer 5
On show.
Being current-limiting resistance with reference to Fig. 2, R1, the electric current preventing sensor output is excessive and damages electricity
Source unit.First electric capacity C1, the second electric capacity C2, the second resistance R2, the 3rd resistance R3 and fortune
Calculate amplifier W and constitute second order active low-pass filter circuit together, as the second resistance R2=4.7k Ω,
3rd resistance R3=5.1k Ω, the first electric capacity C1=22nF, the second electric capacity C2=47nF, filter
The cut-off frequency of wave circuitThe present invention is to switching winding and combined floodgate
Coil current during coil charged moment carries out high-speed data acquisition, through dsp chip 4 with upper
Serial data communication between machine 5, is depicted switching winding current curve and combined floodgate by host computer 5
Coil current curve.
Claims (5)
1. a chopper detecting system, it is characterised in that include dsp chip (4), first
Distribution resistance (2), the second build-out resistor, the first modulate circuit (3), the second modulate circuit, host computer
(5), for detect current signal on breaker open operation coil the first Hall current sensor (1),
And for detecting the second Hall current sensor of the current signal on breaker closing coil;
The outfan of the first Hall current sensor (1) and one end of the first build-out resistor (2) and
The input of one modulate circuit (3) is connected, the outfan of the second Hall current sensor and second
One end of build-out resistor and the input of the second modulate circuit are connected, the first build-out resistor (2)
The equal ground connection of the other end of the other end and the second build-out resistor, the outfan of the first modulate circuit (3) and
The outfan of the second modulate circuit all inputs with dsp chip (4) are connected, dsp chip (4)
It is connected with host computer (5).
Chopper detecting system the most according to claim 1, it is characterised in that described first
Modulate circuit (3) and the second modulate circuit all include the first resistance (R1), the second resistance (R2),
3rd resistance (R3), diode (D), the first electric capacity (C1), the second electric capacity (C2) and computing
Amplifier (W);
One end of first resistance (R1) and the positive pole and the one of the second resistance (R2) of diode (D)
End is connected, the other end of the second resistance (R2) and one end of the 3rd resistance (R3) and the first electricity
The one end holding (C1) is connected, the other end of the 3rd resistance (R3) and the second electric capacity (C2)
The inverting input of one end and operational amplifier (W) is connected, the other end of the second electric capacity (C2)
Ground connection, the in-phase input end of the outfan of operational amplifier (W) and operational amplifier (W) and the
The other end of one electric capacity (C1) is connected;
In first modulate circuit (3), the other end and first Hall current of the first resistance (R1) sense
The outfan of device (1) is connected, the output of operational amplifier (W) in the first modulate circuit (3)
End is connected with the input of dsp chip (4), the first resistance (R1) in the second modulate circuit
The outfan of the other end and the second Hall element is connected, operational amplifier in the second modulate circuit
(W) outfan is connected with the input of dsp chip (4).
Chopper detecting system the most according to claim 1, it is characterised in that the first Hall
Current sensor (1) and the second Hall element are compensation Hall element.
Chopper detecting system the most according to claim 1, it is characterised in that also include report
Alert module, alarm module is connected with the outfan of dsp chip (4).
Chopper detecting system the most according to claim 1, it is characterised in that described computing
The model of amplifier (W) is LM324N.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201610146630.9A CN105891705A (en) | 2016-03-15 | 2016-03-15 | Detection system of a circuit breaker |
Applications Claiming Priority (1)
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CN201610146630.9A CN105891705A (en) | 2016-03-15 | 2016-03-15 | Detection system of a circuit breaker |
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CN105891705A true CN105891705A (en) | 2016-08-24 |
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CN201610146630.9A Pending CN105891705A (en) | 2016-03-15 | 2016-03-15 | Detection system of a circuit breaker |
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Citations (11)
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JP2001208811A (en) * | 2000-01-26 | 2001-08-03 | Fuji Electric Co Ltd | Automatic scale tester for direct current circuit-breaker |
CN101261192A (en) * | 2008-04-24 | 2008-09-10 | 南京因泰莱配电自动化设备有限公司 | 24KV high-voltage vacuum breaker mechanical features on-line monitoring method and monitoring device |
CN101464495A (en) * | 2008-12-31 | 2009-06-24 | 人民电器集团有限公司 | On-line monitoring method for mechanical characteristics of whole set switch apparatus |
CN201681143U (en) * | 2010-03-23 | 2010-12-22 | 西安工程大学 | Online monitoring device for mechanical characteristic of high-voltage circuit breaker |
CN102288907A (en) * | 2011-07-06 | 2011-12-21 | 内蒙古东部电力有限公司赤峰电业局 | Comprehensive condition testing method of circuit breaker |
CN102590739A (en) * | 2012-02-18 | 2012-07-18 | 山西省电力公司晋城供电分公司 | On-line detecting device and detecting method for switch-on and switch-off period of power switch cabinet circuit breaker |
CN202563065U (en) * | 2012-02-18 | 2012-11-28 | 山西省电力公司晋城供电分公司 | Opening and closing period on-line detection device for electric power switch cabinet breaker |
CN202837499U (en) * | 2012-10-29 | 2013-03-27 | 成都讯易达通信设备有限公司 | Testing device for mechanical characteristics in grid circuit breakers |
CN203054194U (en) * | 2012-12-31 | 2013-07-10 | 广州供电局有限公司 | Monitoring system for breaking coil and closing coil of breaker |
CN203502555U (en) * | 2013-09-11 | 2014-03-26 | 广西电网公司电力科学研究院 | Electrical characteristic detecting device for multifunctional high-voltage circuit breaker |
CN203932957U (en) * | 2014-06-10 | 2014-11-05 | 新疆特变电工自控设备有限公司 | The protective relaying device of monitoring switch divide-shut brake coil current |
-
2016
- 2016-03-15 CN CN201610146630.9A patent/CN105891705A/en active Pending
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001208811A (en) * | 2000-01-26 | 2001-08-03 | Fuji Electric Co Ltd | Automatic scale tester for direct current circuit-breaker |
CN101261192A (en) * | 2008-04-24 | 2008-09-10 | 南京因泰莱配电自动化设备有限公司 | 24KV high-voltage vacuum breaker mechanical features on-line monitoring method and monitoring device |
CN101464495A (en) * | 2008-12-31 | 2009-06-24 | 人民电器集团有限公司 | On-line monitoring method for mechanical characteristics of whole set switch apparatus |
CN201681143U (en) * | 2010-03-23 | 2010-12-22 | 西安工程大学 | Online monitoring device for mechanical characteristic of high-voltage circuit breaker |
CN102288907A (en) * | 2011-07-06 | 2011-12-21 | 内蒙古东部电力有限公司赤峰电业局 | Comprehensive condition testing method of circuit breaker |
CN102590739A (en) * | 2012-02-18 | 2012-07-18 | 山西省电力公司晋城供电分公司 | On-line detecting device and detecting method for switch-on and switch-off period of power switch cabinet circuit breaker |
CN202563065U (en) * | 2012-02-18 | 2012-11-28 | 山西省电力公司晋城供电分公司 | Opening and closing period on-line detection device for electric power switch cabinet breaker |
CN202837499U (en) * | 2012-10-29 | 2013-03-27 | 成都讯易达通信设备有限公司 | Testing device for mechanical characteristics in grid circuit breakers |
CN203054194U (en) * | 2012-12-31 | 2013-07-10 | 广州供电局有限公司 | Monitoring system for breaking coil and closing coil of breaker |
CN203502555U (en) * | 2013-09-11 | 2014-03-26 | 广西电网公司电力科学研究院 | Electrical characteristic detecting device for multifunctional high-voltage circuit breaker |
CN203932957U (en) * | 2014-06-10 | 2014-11-05 | 新疆特变电工自控设备有限公司 | The protective relaying device of monitoring switch divide-shut brake coil current |
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Application publication date: 20160824 |