CN104993450A - Residual current protection device and residual current protection method for road lighting - Google Patents
Residual current protection device and residual current protection method for road lighting Download PDFInfo
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- CN104993450A CN104993450A CN201510435406.7A CN201510435406A CN104993450A CN 104993450 A CN104993450 A CN 104993450A CN 201510435406 A CN201510435406 A CN 201510435406A CN 104993450 A CN104993450 A CN 104993450A
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Abstract
The invention discloses a residual current protection device and a residual current protection method for road lighting. The residual current protection device comprises a residual current detection circuit used to detect the leakage current of a lighting loop, a temperature detection circuit used to detect the temperature of the outlet line of the lighting loop, a voltage detection circuit used to detect the voltage of the lighting loop in real time, and a relay control circuit used to control on-off of the lighting circuit. The residual current detection circuit, the temperature detection circuit, the voltage detection circuit and the relay control circuit are connected with a controller. According to the invention, a matching action threshold is set according to the actual characteristics of a protected line, so that fault leakage current can be cut off more accurately and reliably, and a rapid and effective protection effect is achieved. The occurrence of electric shock to pedestrians, fire and other malignant accidents is avoided.
Description
Technical field
The present invention relates to residual current protecting field in illumination, be specifically related to a kind of road lighting Aftercurrent protecting equipment and method.
Background technology
Road lighting power supply distance is longer, and power load is comparatively disperseed, and the possibility that pedestrian touches is large.Upon the occurrence of a ground fault, fault Leakage Current is less, is not enough to protection switch is tripped.But this Leakage Current easily causes electric shock accidents, when overcast and rainy, situation is even more serious.This fault current also easily causes electrical fire simultaneously, causes a serious accident.When road Lighting Design is constructed, increase residual current protection switch, the effect of containment fault Leakage Current can be played.
Existing residual current protection switch is when dispatching from the factory, and residual current acting threshold value is fixed, unadjustable (if operating current is 300mA, 500mA etc.).Design and construction personnel often select operating current threshold value by experience.But empirically select threshold value to there is following problem:
If 1 operating current is selected excessive, there is earth fault in circuit, and switch is still not operating, loses the conservation value of switch.If operating current is selected too small, circuit, by frequent misoperation, affects normal illumination.
2, consider that each loop power supply radius of street lamp is different, the cable model used is variant, easily causes the operating current threshold value selected by experience not mated with actual protected circuit characteristic, does not have protective effect.
3, along with the growth of service time, the parameter such as insulation, impedance of circuit slowly changes, and the normal Leakage Current of circuit also changes, and the fixed threshold selected by experience can not reflect the characterisitic parameter in circuit whole useful life.
Summary of the invention
For solving the deficiency that prior art exists; the invention discloses a kind of road lighting Aftercurrent protecting equipment and method; this device is the Aftercurrent protecting equipment of online real time correction action threshold value; this device is correct residual electric current action threshold value periodically; make it to match with protected circuit characteristic; accurately, reliably can protect illuminating line, avoid personnel to get an electric shock, the major accident such as fire occurs.
For achieving the above object, concrete scheme of the present invention is as follows:
A kind of road lighting Aftercurrent protecting equipment, comprising: residual current detection circuit, for detecting lighting loop Leakage Current; Temperature sensing circuit, for detecting lighting loop outlet temperature; Voltage detecting circuit, for detecting lighting loop voltage in real time; Control relay circuit, for controlling the break-make of lighting loop;
Described residual current detection circuit, temperature sensing circuit, voltage detecting circuit and control relay circuit are all connected with controller, controller arranges the sense cycle of the action threshold value of residual current, the action threshold value of outlet temperature, the action threshold value of lighting loop voltage and controller respectively, when any one measured value of residual current, outlet temperature and lighting loop voltage is greater than the action threshold value of its correspondence, controller control relay control circuit cuts off protected circuit and lighting loop automatically; Controller, every setting sense cycle, is recalibrated the action threshold value of residual current, is made it to match with circuit current properties.
Circuit current properties is: current line normal leakage current value, current line insulating properties, current line go out the parameters such as line length.Residual current is the electric current that residual current transformer detects owing to there being current leakage to go out.Leakage Current is also referred to as residual current.
Above-mentioned a kind of road lighting Aftercurrent protecting equipment, when the action threshold value setting of residual current, is specially: the action threshold value of residual current is 2.5 times of normal Leakage Current:
I
action=2.5I
normally.
All can there is leakage current because of having the existence of distributed capacitance between the earth in any circuit, this leakage current is inevitable, therefore claim, normal leakage electric current.
Further, described controller is also connected with display circuit, communicating circuit and key circuit, residual current, temperature and voltage that display circuit detects for showing testing circuit, communicating circuit is used for this controller and other equipment to carry out communication, and button is for inputting setting content.
When recalibrating the action threshold value of residual current, residual current detection circuit gathered N group residual electricity flow valuve in last sense cycle, this N group residual electricity flow valuve is sorted according to ascending, reject the maximum numerical value of residual electricity flow valuve and the minimum numerical value of residual electricity flow valuve, the summation of remaining residual electricity flow valuve is averaged the action threshold value of the residual current being next sense cycle.
The method of the action threshold value of above-mentioned recalibration residual current, can adjust the action threshold value of residual current timely, avoids because action threshold value can not adjust the coarse problem of the control caused in time.
Described residual current detection circuit, comprise current collection circuit, emitter follower circuit, level lifting circuit, reverse amplification circuit and port protection circuit, proportional for tested ac current signal reduces and is sent to emitter follower circuit by current collection circuit, emitter follower circuit is sent to level lifting circuit for improving late-class circuit to the extractability of measured signal, level lifting circuit is for being raised to the scope of DSP port adaptation and being sent to reverse amplification circuit by measured signal, signal is adjusted to direct current signal and is sent to port protection circuit by reverse amplification circuit, port protection circuit is connected with controller.
Current collection circuit is residual current transformer, for detecting the residual current of three-phase circuit.The M port of residual current transformer IC1, by grounding through resistance, converts current signal to voltage signal.The power end of residual current transformer IC1 is all by capacity earth, and object is the noise jamming utilizing capacitive absorption power down source.The M port of residual current transformer IC1 is connected with discharge circuit input, and the output of discharge circuit is connected with two unilateral diodes, and it act as the output signal of operational amplifier " clamper " to 3.3V.
Discharge circuit comprises three operational amplifiers, three operational amplifiers are an entirety, and it act as: the voltage of the millivolt level that current transformer detects, because current transformer can only detect electric current, this electric current is milliampere level.Can convert current signal to voltage signal by a grounding through resistance, this voltage signal is millivolt level, is enlarged into the voltage of volt level, facilitates AD conversion unit AD process.
Described temperature sensing circuit comprises thermistor IC2, the positive pole termination power of thermistor IC2, the negative pole end of thermistor IC2 is connected with discharge circuit input, resistance and the electric capacity of ground connection is also parallel with between the negative pole end of thermistor IC2 and the positive terminal of amplifier, the output of discharge circuit is also by capacity earth, and the output of discharge circuit is also connected with the input of controller.
Thermistor act as: perception ambient temperature, and when ambient temperature changes, himself resistance value changes.
Temperature sensing circuit operation principle: temperature sensing circuit is by a thermistor perception ambient temperature, the resistance of this thermistor becomes one-to-one relationship with ambient temperature, by the resistance of the real-time thermistor for the treatment of circuit collection below, the numerical value of current ambient temperature just can be known.
Described voltage detecting circuit two terminals access lighting loops, two terminals are connected with the input of transformer T1, transformer T1 output is connected with the input of voltage follower IC4, the output of voltage follower IC4 is also connected with discharge circuit input, and discharge circuit output is connected with the output of controller.
IC4 is the voltage follower utilizing isolated amplifier to form, and refers to Fig. 6.Its effect improves input impedance, reduces output impedance, and isolated by input voltage, reduces the impact of tested alternating current on controller.
The principle of voltage detecting circuit is: the first step, and voltage transformer changes tested alternating voltage into alternating voltage compared with low amplitude value.Second step, resistance R22, R12 form potential-divider network, reduce the amplitude of tested voltage further, and output voltage difference signal.3rd step, isolated amplifier IC4 forms voltage follower, improves input signal impedance, reduces output signal impedance.4th step, amplifier TL074U3A forms subtraction, changes tested AC signal into direct current signal.5th step, amplifier TL074U3A forms Butterworth filter, filtering interference signals.
The input of described relay drive circuit is connected with the output of controller, this input divides two-way, one tunnel is connected with power supply through resistance, another road is connected with the input of transistor circuit through resistance, the output of transistor circuit divides two-way, one tunnel is connected with unilateral diode, and another road is connected with lead-out terminal, and lead-out terminal is used for being connected with relay.
Relay drive circuit principle: when Leakage Current occurring and exceeding action threshold value, overvoltage or excess temperature, controller can send the instruction of the actuating of relay, but because the carrying load ability of controller is limited, can not the Direct driver actuating of relay, so need drive circuit.
Main devices and effect: R19 is pull-up resistor, and R20 is current-limiting resistance, and Q1Q2 is that secondary amplifies, and the millivolt signal exported by I/O port amplifies, can drive the action of relay.
A method for road lighting Aftercurrent protecting equipment, comprising:
Controller arranges the sense cycle of the action threshold value of residual current, the action threshold value of outlet temperature, the action threshold value of lighting loop voltage and controller respectively;
Utilize residual current detection electric circuit inspection lighting loop residual current, utilize temperature sensing circuit to detect lighting loop outlet temperature; Voltage detecting circuit is utilized to detect lighting loop voltage in real time;
First the detected value of residual current and the set action threshold value of residual current is judged, when residual current exceedes set action threshold value, controller sends trip command, otherwise, continue to judge whether temperature detection value exceedes temperature set action threshold value, when exceeding, controller sends trip command, otherwise, continue to judge to control whether arrive setting cycle, if to setting cycle, then carry out calibration residual current acting threshold value, otherwise continue to detect.
When calibrating the action threshold value of residual current, residual current detection circuit gathered N group residual electricity flow valuve in last sense cycle, this N group residual electricity flow valuve is sorted according to ascending, reject the maximum numerical value of residual electricity flow valuve and the minimum numerical value of residual electricity flow valuve, the summation of remaining residual electricity flow valuve is averaged the action threshold value of the residual current being next sense cycle.
Beneficial effect of the present invention:
1, the present invention is according to the actual characteristic of protected circuit, sets the action threshold value that matches, can more accurate, reliable disengagement failure Leakage Current, plays protective effect fast and effectively.Avoid pedestrian to get an electric shock, the generation of the serious accident such as fire.
2, temperature detection of the present invention provides redundancy analysis function, and Timeliness coverage also eliminates disaster hidden-trouble.
3, the Leakage Current of the present invention's collection, can analyze cable service condition, the cable being deteriorated to insulation, extending service in the army, initiative alarming, reminds administrative staff to change in time.The harm such as fire, electric leakage is eliminated in rudiment.
4, present invention improves over a kind of current detection circuit.This circuit can detect the AC current values of lighting loop accurately, and conditioning is to the acceptable scope of DSP.
Accompanying drawing explanation
Fig. 1 road lighting Aftercurrent protecting equipment of the present invention structure chart;
The workflow diagram of Fig. 2 road lighting Aftercurrent protecting equipment of the present invention;
Fig. 3 calibration actions threshold value of the present invention flow chart;
Fig. 4 residual current detection circuit diagram of the present invention;
Fig. 5 temperature sensing circuit figure of the present invention;
Fig. 6 voltage detecting circuit figure of the present invention;
Fig. 7 relay drive circuit figure of the present invention;
Fig. 8 residual current detection electric circuit inspection of the present invention schematic diagram.
Embodiment:
Below in conjunction with accompanying drawing, the present invention is described in detail:
As shown in Figure 1, a kind of road lighting Aftercurrent protecting equipment is made up of residual current detection circuit, temperature sensing circuit, voltage detecting circuit, control relay circuit, controller and the unit such as display, communication.
As shown in Figure 8, in figure, IA, IB, IC are phase current to residual current detection electric circuit inspection principle, and IN is neutral current, and Id is the over the ground residual current of phase line at a point, and S is arbitrary sealing surface.According to Kirchhoff's law, the current effective value phasor sum flowing into arbitrary sealing surface S equals zero, then have IA+IB+IC-IN-Id=0 to arrange IA+IB+IC-IN=Id.Under normal circumstances, the vector of three-phase current is equal with the size of current flow through in N line, and direction is contrary, cancels out each other.If line insulation deterioration or other reason cause A phase line to produce earth-current at a point, to induce the electric current be directly proportional to residual current Id size in the coil of then S place current transformer in the drawings, its numerical values recited reflects the leak case of electric current in distribution line and electric equipment.
This device, every some cycles, resets residual current protection action threshold value, makes it to match with circuit current properties.
After setting action threshold value, this device real time monitoring circuit residual current, when circuit residual current exceedes action threshold value, device cuts off protected circuit automatically, eliminates fault in time, and informs that administrative staff are sitting in fault loop, facilitates later maintenance.
Threshold setting method is, operating current is 2.5 times of normal Leakage Current:
I
action=2.5I
normally
For fault Leakage Current is set as action threshold value by avoiding device, when namely avoiding breaking down, device is failure to actuate, and thinks by mistake normal.The upper limit of action threshold value is set as 500mA.
As shown in Figure 2, controller arranges the sense cycle of the action threshold value of residual current, the action threshold value of outlet temperature, the action threshold value of lighting loop voltage and controller respectively, when any one measured value of residual current, outlet temperature and lighting loop voltage is greater than the action threshold value of its correspondence, controller control relay control circuit cuts off protected circuit automatically; Controller, every setting sense cycle, is recalibrated the action threshold value of residual current, is made it to match with circuit current properties.
As shown in Figure 3, when recalibrating the action threshold value of residual current, residual current detection circuit gathered N group residual electricity flow valuve in last sense cycle, this N group residual electricity flow valuve is sorted according to ascending, reject the maximum numerical value of residual electricity flow valuve and the minimum numerical value of residual electricity flow valuve, the summation of remaining residual electricity flow valuve is averaged the action threshold value of the residual current obtaining next sense cycle.
The method of the action threshold value of above-mentioned recalibration residual current, can adjust the action threshold value of residual current timely, avoids because action threshold value can not adjust the coarse problem of the control caused in time.
As shown in Figure 4, described residual current detection circuit, comprise residual current transformer IC1, the M port of described residual current transformer IC1 is by grounding through resistance, and the power end of described IC1 is all by capacity earth, and the M port of described IC1 is also connected with discharge circuit input, the output of discharge circuit is connected with two unilateral diodes, one of them unilateral diode is connected with power end, and another unilateral diode is connected to the ground, and the output of discharge circuit is also connected with the input of controller.Residual current transformer is for detecting the residual current of three-phase circuit.
Current detection circuit is made up of current acquisition, emitter following, level lifting, oppositely amplification, port protection.Current acquisition is used for being reduced by proportional for tested ac current signal, to meet DSP port tolerance range.Emitter following is for improving the extractability of late-class circuit to measured signal.Level lifting is used for scope measured signal being raised to the adaptation of DSP port.Reverse amplification is that signal is adjusted to direct current signal.Port protection, for the protection of DSP analog input pin, prevents overvoltage from occurring.
As shown in Figure 5, described temperature sensing circuit comprises thermistor IC2, the positive pole termination power of thermistor IC2, the negative pole end of thermistor IC2 is connected with discharge circuit input, resistance and the electric capacity of ground connection is also parallel with between the negative pole end of thermistor IC2 and the positive terminal of amplifier, the output of discharge circuit is also by capacity earth, and the output of discharge circuit is also connected with the input of controller.Temperature sensing circuit detects lighting loop outlet temperature.When there is excess temperature, cut-off loop, protection circuit.
As shown in Figure 6, voltage detecting circuit two terminals access lighting loops, two terminals are connected with the input of transformer T1, transformer T1 output is connected with the input of voltage follower IC4, the output of voltage follower IC4 is also connected with discharge circuit input, and discharge circuit output is connected with the output of controller.Real-time detection lighting loop voltage, when there is overvoltage, cutting off lighting loop, playing reliable protective effect.
As shown in Figure 7, the input of relay drive circuit is connected with the output of controller, this input divides two-way, one tunnel is connected with power supply through resistance, another road is connected with the input of transistor circuit through resistance, and the output of transistor circuit divides two-way, and a road is connected with unilateral diode, another road is connected with lead-out terminal, and lead-out terminal is used for being connected with relay.
When Leakage Current exceedes action threshold value, overvoltage or excess temperature, device all makes relay closes, disconnects ac contactor coil, disconnects A.C. contactor, thus cuts off lighting loop.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (10)
1. a road lighting Aftercurrent protecting equipment, is characterized in that, comprising: residual current detection circuit, for detecting lighting loop Leakage Current; Temperature sensing circuit, for detecting lighting loop outlet temperature; Voltage detecting circuit, for detecting lighting loop voltage in real time; Control relay circuit, for controlling the break-make of lighting loop;
Described residual current detection circuit, temperature sensing circuit, voltage detecting circuit and control relay circuit are all connected with controller, controller arranges the sense cycle of the action threshold value of residual current, the action threshold value of outlet temperature, the action threshold value of lighting loop voltage and controller respectively, when any one measured value of residual current, outlet temperature and lighting loop voltage is greater than the action threshold value of its correspondence, controller control relay control circuit cuts off protected circuit automatically; Controller, every setting sense cycle, is recalibrated the action threshold value of residual current, is made it to match with circuit current properties.
2. a kind of road lighting Aftercurrent protecting equipment as claimed in claim 1, is characterized in that, when the action threshold value setting of residual current, is specially: the action threshold value of residual current is 2.5 times of normal Leakage Current:
I
action=2.5I
normally.
3. a kind of road lighting Aftercurrent protecting equipment as claimed in claim 1; it is characterized in that; described controller is also connected with display circuit, communicating circuit and key circuit; residual current, temperature and voltage that display circuit detects for showing testing circuit; communicating circuit is used for this controller and other equipment to carry out communication, and button is for inputting setting content.
4. a kind of road lighting Aftercurrent protecting equipment as claimed in claim 1; it is characterized in that; when recalibrating the action threshold value of residual current; residual current detection circuit gathered N group residual electricity flow valuve in last sense cycle; this N group residual electricity flow valuve is sorted according to ascending; reject the maximum numerical value of residual electricity flow valuve and the minimum numerical value of residual electricity flow valuve, the summation of remaining residual electricity flow valuve is averaged the action threshold value of the residual current being next sense cycle.
5. a kind of road lighting Aftercurrent protecting equipment as claimed in claim 1, it is characterized in that, described residual current detection circuit, comprise current collection circuit, emitter follower circuit, level lifting circuit, reverse amplification circuit and port protection circuit, proportional for tested ac current signal reduces and is sent to emitter follower circuit by current collection circuit, emitter follower circuit is sent to level lifting circuit for improving late-class circuit to the extractability of measured signal, level lifting circuit is for being raised to the scope of DSP port adaptation and being sent to reverse amplification circuit by measured signal, signal is adjusted to direct current signal and is sent to port protection circuit by reverse amplification circuit, port protection circuit is connected with controller.
6. a kind of road lighting Aftercurrent protecting equipment as claimed in claim 1; it is characterized in that; described temperature sensing circuit comprises thermistor IC2; the positive pole termination power of thermistor IC2; the negative pole end of thermistor IC2 is connected with discharge circuit input; also be parallel with resistance and the electric capacity of ground connection between the negative pole end of thermistor IC2 and the positive terminal of amplifier, the output of discharge circuit is also by capacity earth, and the output of discharge circuit is also connected with the input of controller.
7. a kind of road lighting Aftercurrent protecting equipment as claimed in claim 1; it is characterized in that; described voltage detecting circuit two terminals access lighting loops; two terminals are connected with the input of transformer T1; transformer T1 output is connected with the input of voltage follower IC4; the output of voltage follower IC4 is also connected with discharge circuit input, and discharge circuit output is connected with the output of controller.
8. a kind of road lighting Aftercurrent protecting equipment as claimed in claim 1; it is characterized in that; the input of described relay drive circuit is connected with the output of controller; this input divides two-way, and a road is connected with power supply through resistance, and another road is connected with the input of transistor circuit through resistance; the output of transistor circuit divides two-way; one tunnel is connected with unilateral diode, and another road is connected with lead-out terminal, and lead-out terminal is used for being connected with relay.
9. the method for a kind of road lighting Aftercurrent protecting equipment as claimed in claim 1, is characterized in that, comprising:
Controller arranges the sense cycle of the action threshold value of residual current, the action threshold value of outlet temperature, the action threshold value of lighting loop voltage and controller respectively;
Utilize residual current detection electric circuit inspection lighting loop residual current, utilize temperature sensing circuit to detect lighting loop outlet temperature; Voltage detecting circuit is utilized to detect lighting loop voltage in real time;
First the detected value of residual current and the set action threshold value of residual current is judged, when residual current exceedes set action threshold value, controller sends trip command, otherwise, continue to judge whether temperature detection value exceedes temperature set action threshold value, when exceeding, controller sends trip command, otherwise, continue to judge to control whether arrive setting cycle, if to setting cycle, then carry out calibration residual current acting threshold value, otherwise continue to detect.
10. the method for a kind of road lighting Aftercurrent protecting equipment as claimed in claim 9; it is characterized in that; when calibrating the action threshold value of residual current; residual current detection circuit gathered N group residual electricity flow valuve in last sense cycle; this N group residual electricity flow valuve is sorted according to ascending; reject the maximum numerical value of residual electricity flow valuve and the minimum numerical value of residual electricity flow valuve, the summation of remaining residual electricity flow valuve is averaged the action threshold value of the residual current being next sense cycle.
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Cited By (1)
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