CN1880965A - Power transmission line break monitoring and alarming device - Google Patents
Power transmission line break monitoring and alarming device Download PDFInfo
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- CN1880965A CN1880965A CN 200510035199 CN200510035199A CN1880965A CN 1880965 A CN1880965 A CN 1880965A CN 200510035199 CN200510035199 CN 200510035199 CN 200510035199 A CN200510035199 A CN 200510035199A CN 1880965 A CN1880965 A CN 1880965A
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Abstract
The invention discloses a power transmission circuit breaking monitoring and alarming device, which comprises the following parts: offset current circuit, current detecting circuit, driving circuit and alarm, wherein the offset current circuit is connected on the power transmission circuit to produce an offset current from rear of transmission circuit, which connects impedance between live wire and ground of transmission circuit rear; the current detecting circuit detects the offset current of offset current circuit; the driving circuit connects the output end of current detecting circuit, which drives alarm to alarm when the offset current is not detected by current detecting circuit. The invention can alarm automatically, which can find the circuit damage condition for restoring rapidly and reduces loss.
Description
Technical field
The present invention relates to a kind of power transmission line break monitoring and alarming device.
Technical background
Electric energy has crucial effect as a kind of energy, and it mainly is transported to each electricity consumption district by power transmission line, and these power transmission lines are crisscross, is dispersed throughout each corner in city and rural area, and power delivery is arrived the place that each needs.But these power transmission lines are damaged through regular meeting, as: artificially steal the damage etc. of cutting and construct.The power transmission line that damages can't continue power supply, brings very big influence even cause enormous economic loss for the production of factory and people's life.The scope that these power transmission lines are laid is wide, route length and complicated, often can not be found timely after the damage, also just can not be repaired in time certainly.
If power transmission line suffers to damage and can report to the police automatically, so just can in time find the damage of circuit, thereby repair circuit apace, reduce the loss.
Summary of the invention
When the object of the present invention is to provide a kind of power transmission line to damage, the power transmission line break monitoring and alarming device that is used to monitor the power transmission line damaged condition that can report to the police automatically.
For realizing purpose of the present invention, by power transmission line break monitoring and alarming device of the present invention, comprise: be connected on the power transmission line, make the power transmission line tail end produce a bias current circuit that flows out the bias current of power transmission line, this bias current circuit contains the live wire that is connected in the power transmission line tail end and the impedance between the ground; Be used to detect the current detection circuit of the bias current that above-mentioned bias current circuit produces; Link to each other, when current detection circuit does not detect the bias current of bias current circuit generation, drive the driving circuit of alarm equipment alarm with the output terminal of current detection circuit; And alarm.
Contain the impedance that is connected between power transmission line tail end live wire and the ground in the bias current circuit, when power transmission line did not damage, there was voltage in these impedance two ends, under the voltage effect, produced the bias current of an inflow place from power transmission line in the impedance.At this moment, the current detection circuit that is used for detecting this bias current can record this bias current.When power transmission line is damaged, the loss of voltage at impedance two ends, the bias current of its inflow place also disappears, and current detection circuit detects the bias current that produces less than bias current circuit, thereby driving circuit drives alarm equipment alarm.
Therefore when the present invention damaged at power transmission line, warning device was reported to the police, thereby can find the damage of power transmission line in time, thereby repairs fast, reduces the loss.
Description of drawings
Fig. 1 is the circuit diagram of power transmission line break detection alarm device of the present invention;
Fig. 2 is the specific embodiment of line broken circuit monitoring alarm in single-phase power transmission line of power transmission line;
Fig. 3 is line broken circuit monitoring alarm another specific embodiment in single-phase power transmission line of power transmission line;
Fig. 4 is the another specific embodiment of line broken circuit monitoring alarm in single-phase power transmission line of power transmission line;
Fig. 5 is the again specific embodiment of line broken circuit monitoring alarm in single-phase power transmission line of power transmission line;
Fig. 6 is the again specific embodiment of line broken circuit monitoring alarm in single-phase power transmission line of power transmission line;
Fig. 7 is the again specific embodiment of line broken circuit monitoring alarm in single-phase power transmission line of power transmission line;
Fig. 8 is the again specific embodiment of line broken circuit monitoring alarm in single-phase power transmission line of power transmission line;
Fig. 9 is the again specific embodiment of line broken circuit monitoring alarm in single-phase power transmission line of power transmission line;
Figure 10 is the specific embodiment of line broken circuit monitoring alarm in three phase transmission line of power transmission line;
Figure 11 is line broken circuit monitoring alarm another specific embodiment in three phase transmission line of power transmission line;
Figure 12 is the another specific embodiment of line broken circuit monitoring alarm in three phase transmission line of power transmission line;
Figure 13 is the again specific embodiment of line broken circuit monitoring alarm in three phase transmission line of power transmission line.
Embodiment
Embodiment 1, and as shown in Figure 2, by the application of power transmission line break monitoring and alarming device of the present invention in unidirectional electric power system, power transmission line comprises a live wire 1, a zero line 2; Bias current circuit is to be connected in the live wire 1 of power transmission line tail end and the inductance 15 between the ground 3; Current detection circuit 6 comprises: current transformer 9, amplifying circuit 10, rectification circuit 11, subtraction circuit 12, amplifying circuit 13 and comparator circuit 14; Current transformer 9 is positioned at the power end of power transmission line, iron core is placed in outside the power transmission line, the measurement output terminal of current transformer 9 links to each other with the input end of amplifying circuit 10, the output terminal of amplifying circuit 10 links to each other with the input end of rectification circuit 11, the output terminal of rectification circuit 11 links to each other with the input end of subtraction circuit 12, this subtraction circuit 12 subtracts each other the signal and the setting signal of rectification circuit 11 inputs, the output terminal of subtraction circuit 12 links to each other with the input end of driving circuit 7, the output terminal of driving circuit 7 links to each other with alarm 8, when this driving circuit 7 is output as zero when subtraction circuit 12, drives alarm 8 and report to the police.
By Kirchhoff's law as can be known: the total current in the live wire 1 equals the total current in the zero line 2 and flows out total bias current sum of power transmission line, and total bias current of power transmission line is the poor of total current in the live wire 1 and the total current in the zero line 2.The iron core of current transformer 9 is placed in outside the live wire 1 and zero line 2 of power end, its detected signal is corresponding with total bias current of power transmission line, detected signal is after amplifying circuit 10 amplifies, enter rectification circuit 11 rectifications, signal input subtraction circuit 12 after the rectification, in subtraction circuit 12, subtract each other with a setting signal, this setting value is corresponding with the bias current that power transmission line itself exists, signal input driving circuit 7 after subtracting each other, this driving circuit 7 drive alarm 8 and report to the police when input signal is zero.
When the power transmission line normal power supply, there is voltage at inductance 15 two ends that are connected between live wire 1 and the ground 3, wherein have bias current to flow through.At this moment, the pairing signal of bias current that current transformer 9 detected signal existing lines itself exist also has the pairing signal of the bias current that flows through in the inductance 15.Thereby, signal deducts the setting signal corresponding with the bias current value of circuit existence itself in subtraction circuit 12 after, the corresponding signal output of the bias current that it also has and inductance 15 produces, this signal input driving circuit 7, thereby alarm 8 is not reported to the police.
When power transmission line damaged, inductance 15 both end voltage that are connected between live wire and the ground disappeared, and wherein do not have bias current and flow through.At this moment, current transformer 9 detected signals only are the pairing signal of bias current that circuit itself exists.After subtraction circuit 12 deducted the setting value of the bias current correspondence that circuit itself exists, with no signal output, driving circuit 7 did not just have the signal input yet, thereby, drive alarm 8 and report to the police.
Therefore when power transmission line damaged, the present invention can report to the police, thereby can find the damaged condition of power transmission line in time.In addition, by Kirchhoff's law as can be known, the size of the detected bias current of current transformer and the load in the power transmission line are irrelevant, thereby this power transmission line break monitoring and alarming device work is not subjected to load limitations.
But, because may there be certain deviation in the respective value of the bias current that power transmission line itself exists and the setting value in the subtraction circuit 12, the respective value of the bias current that exists than power transmission line itself when setting value is wanted hour, the defective of not reporting to the police when the power transmission line break detection alarm device of present embodiment can power transmission line break occur.In order to overcome this kind defective, as shown in Figure 3, between the subtraction circuit 12 of current detection circuit and driving circuit 7, be connected with amplifying circuit 13 and comparator circuit 14.The input end of amplifying circuit 13 links to each other with the output terminal of subtraction circuit 12, the output terminal of amplifying circuit 13 links to each other with the input end of comparator circuit 14, the output terminal of comparator circuit 14 links to each other with the input end of driving circuit 7, and the output signal of amplifying circuit 13 compares with another door signal in comparator circuit 14.
The respective value of the bias current that power transmission line itself exists is wanted big situation than the setting value in the subtraction circuit 12 under, when power transmission line damages, the pairing signal of bias current that current transformer 9 detected signals only have power transmission line itself to exist, this signal after amplifying rectification, in subtraction circuit with subtraction circuit in setting value subtract each other.Because the respective value of the bias current that power transmission line itself exists is big than the setting value in the subtraction circuit 12, thereby after subtracting each other, the output of subtraction circuit 12 is non-vanishing.This output signal compares with a door signal in comparator circuit 14 after amplifying circuit 13 amplifies, and the signal after only needing to amplify is less than the door signal, and comparator circuit 14 is with regard to no-output, and driving circuit 7 promptly drives alarm 8 and reports to the police.Therefore by the door signal value reasonably is set, can overcome above-mentioned defective.
Embodiment 2, and as shown in Figure 4, by the application of power transmission line break monitoring and alarming device of the present invention in unidirectional electric power system, power transmission line comprises a live wire 1, a zero line 2; Bias current circuit is to be connected in the live wire 1 of power transmission line tail end and the inductance 15 between the ground; Current detection circuit comprises: be positioned at power transmission line tail end, iron core and be placed in the outer current transformer 9 of inductance 15 branch roads; The input end of driving circuit 7 links to each other with the measurement output terminal of current transformer 9, and the output terminal of driving circuit 7 links to each other with alarm 8, and current transformer 9 is measured when being output as zero, and driving circuit 7 drives alarm 8 and reports to the police.
During the power transmission line normal power supply, there is voltage at inductance 15 two ends that are connected between live wire 1 and the ground 3, wherein have bias current to flow through.At this moment, current transformer 9 can detect therewith and flow through the pairing signal of bias current in the inductance 15, and it is non-vanishing that it measures output, thereby alarm 8 is not reported to the police.
When power transmission line damaged, inductance 15 both end voltage that are connected between live wire and the ground disappeared, and wherein do not have bias current and flow through.At this moment, the measurement of current transformer 9 is output as zero, thereby driving circuit 7 drives alarm 8 warnings.
Therefore, when power transmission line damages, can find the damaged condition of power transmission line in time, thereby, repair circuit fast, reduce the loss.
The iron core of current transformer 9 is placed in outside the live wire 1 and zero line 2 of power end, its detected signal is corresponding with total bias current of power transmission line, detected signal is after amplifying circuit 10 amplifies, enter rectification circuit 11 rectifications, signal input subtraction circuit 12 after the rectification, in subtraction circuit 12, subtract each other with a setting signal, this setting signal is corresponding with the bias current that power transmission line itself exists, amplify in the signal input amplifying circuit 13 after subtracting each other, import comparator circuit 14 after the amplification again, in comparator circuit 14, compare with a door signal.
When the power supply of power switch 26 closures, power transmission line, itself and the damaged condition of the good Monitoring Line of embodiment 1 identical energy.
When power switch 26 disconnections, when power transmission line is stopped power supply, coil 20 outages of relay 18, normally closed contact 19 closures, the secondary and live wire 1 of transformer 17 is communicated with, coil 22 outages of relay 21, its normally closed contact 23 closures, normally opened contact 24 disconnects, and inductance 15 disconnects with live wire 1, and inductance 16 is communicated with live wire 1, set up a voltage like this at the two ends of inductance 16, thereby in inductance 16, flow through a bias current.At this moment, the total current on the live wire 1 is the bias current sum of bias current and live wire 1 itself existence for this reason just, and no current on the zero line 2, the total current that flows through current transformer 9 inside is this two bias currents sum, also is total bias current.At this moment, the pairing signal of bias current that current transformer 9 detected signal existing lines itself exist also has the pairing signal of the bias current that flows through in the inductance 15.Thereby after subtraction circuit deducts the setting value corresponding with the bias current value of circuit existence itself, it also has the corresponding signal output of the bias current that produces with inductance 9, greater than the door signal, thereby comparator circuit has output to this signal after amplifying circuit 13 amplifies, and warning device is not reported to the police.
When power transmission line damaged, inductance 16 both end voltage that are connected between live wire 1 and the ground 3 disappeared, and wherein do not have bias current and flow through.At this moment, current transformer 9 detected signals only are the pairing signal of bias current that circuit itself exists.Thereby after subtraction circuit 12 deducts the setting value of the bias current correspondence that circuit itself exists, with no signal output, thereby comparator circuit 14 no-outputs, warning device is reported to the police.
As from the foregoing, this line broken circuit monitoring alarm, the Shi Junneng that powers and stop power supply monitors the damaged condition of circuit well.
But, when power switch 26 is stopped power supply, the inferior situation that occurs breakdown damage most probably owing to the transformer among reason the present invention of load discharge 17, generation for fear of this kind situation, as shown in Figure 6, between the coil 20 of relay 18 and live wire 1, be connected with an outage time lagged type time relay 31.Because the outage time lagged type time relay 31 is arranged in coil 20 loops of relay 18, thereby, when power switch disconnects, coil 20 time-delays disconnect, its normally closed contact 19 time closings, when normally closed contact was closed, the electric energy in the load bled off, thereby, prevented that well the breakdown situation of transformer negative pole from taking place.
The above-mentioned outage time lagged type time relay also can be connected between coil 20 and the zero line 2.
Also can between the normally closed contact 19 of relay 18 and live wire 1 or ground 3, be connected an on-delay type time relay.Power switch when outage, the secondary time-delay conducting of its transformer 17, thereby well avoided transformer 17 secondary because of load discharge breakdown.
In the present embodiment, as shown in Figure 7, the normally opened contact 24 of relay 21 also can be connected between inductance 15 and the ground 3, and its normally closed contact 23 also can be connected between inductance 16 and the ground 3.The normally closed contact 19 of relay 18 also can be connected between the secondary of transformer 17 and the ground 3.
Embodiment 4, and as shown in Figure 8, by the application of power transmission line break monitoring and alarming device of the present invention in unidirectional electric power system, power transmission line comprises live wire 1 and zero line 2.On the power end live wire 1 of power transmission line power switch 26 is installed.Bias current circuit 5 comprises: two are connected in parallel in the live wire 1 of power transmission line tail end and the impedance 15,16 between the ground 3; A relay 21 that is connected in the power transmission line tail end, a normally closed contact 23 of this relay 21 is connected between impedance 16 and the live wire 1, and its normally opened contact 24 is connected between impedance 15 and the live wire 1, and its coil 22 is connected between live wire 1 and the zero line 2; Be positioned at the electric capacity 25 that power end, an end and power switch 26 preceding live wires 1 link to each other, the other end links to each other with the power switch 26 back live wires that are connected with impedance 16 1 of power transmission line; A relay 18 that is connected in the power transmission line power end, a normally closed contact 19 of this relay 18 are connected between the end and live wire 1 of electric capacity 25, and its coil 20 is connected between power switch 26 live wire 1 and zero line 2 afterwards.Current detection circuit comprises: current transformer 9, amplifying circuit 10, rectification circuit 11, subtraction circuit 12, amplifying circuit 13 and comparator circuit 14; Current transformer 9 is positioned at the power end of power transmission line, iron core is placed in outside the power transmission line, the measurement output terminal of current transformer 9 links to each other with the input end of amplifying circuit 10, the output terminal of amplifying circuit 10 links to each other with the input end of rectification circuit 11, the output terminal of rectification circuit 11 links to each other with the input end of subtraction circuit 12, this subtraction circuit 12 subtracts each other signal and a setting signal of rectification circuit 11 inputs, the output terminal of subtraction circuit 12 links to each other with the input end of another amplifying circuit 13, the output terminal of this amplifying circuit 13 links to each other with the input end of comparator circuit 14, and this comparator circuit 14 is compared the input signal of amplifying circuit 13 with a door signal.The input end of driving circuit 7 links to each other with the output terminal of comparator circuit 14, and the output terminal of driving circuit 7 links to each other with alarm 8, when this driving circuit 7 is output as zero when comparator circuit 14, drives alarm 8 and reports to the police.
The iron core of current transformer 9 is placed in outside the live wire 1 and zero line 2 of power end, its detected signal is corresponding with total bias current of power transmission line, detected signal is after amplifying circuit 10 amplifies, enter rectification circuit 11 rectifications, signal input subtraction circuit 12 after the rectification, in subtraction circuit 12, subtract each other with a setting signal, this setting value is corresponding with the bias current that power transmission line itself exists, amplify in the signal input amplifying circuit 13 after subtracting each other, import comparator circuit 14 after the amplification again, in comparator circuit 14, compare with a door signal.
When the power supply of power switch 26 closures, power transmission line, itself and the damaged condition of the good Monitoring Line of embodiment 1 identical energy.
When power switch 26 disconnections, when power transmission line is stopped power supply, coil 20 outages of relay 18, normally closed contact 19 closures, the two ends of electric capacity 25 are communicated with the live wire 1 at power switch 26 two ends, coil 22 outages of relay 21, its normally closed contact 23 closures, normally opened contact 24 disconnects, and inductance 15 disconnects with live wire 1, and inductance 16 is communicated with live wire 1, set up a voltage like this at the two ends of inductance 16, thereby in inductance 16, flow through a bias current.At this moment, the total current on the live wire 1 is the bias current sum of bias current and live wire 1 itself existence for this reason just, and no current on the zero line 2, the total current that flows through current transformer 9 inside is this two bias currents sum, also is total bias current.At this moment, the pairing signal of bias current that current transformer 9 detected signal existing lines itself exist also has the pairing signal of the bias current that flows through in the inductance 15.Thereby after subtraction circuit deducts the setting value corresponding with the bias current value of circuit existence itself, it also has the corresponding signal output of the bias current that produces with inductance 9, greater than the door signal, thereby comparator circuit has output to this signal after amplifying circuit 13 amplifies, and warning device is not reported to the police.
When power transmission line damaged, inductance 16 both end voltage that are connected between live wire 1 and the ground 3 disappeared, and wherein do not have bias current and flow through.At this moment, current transformer 9 detected signals only are the pairing signal of bias current that circuit itself exists.Thereby after subtraction circuit 12 deducts the setting value of the bias current correspondence that circuit itself exists, with no signal output, thereby comparator circuit 14 no-outputs, warning device is reported to the police.
As from the foregoing, this line broken circuit monitoring alarm, the Shi Junneng that powers and stop power supply monitors the damaged condition of circuit well.
In the present embodiment, as shown in Figure 9, the normally opened contact 24 of relay 21 also can be connected between inductance 15 and the ground 3, and its normally closed contact 23 also can be connected between inductance 16 and the ground 3.
The same with embodiment 1, the described power transmission line break monitoring and alarming device of present embodiment is reported to the police when power transmission line damages.Thereby, when power transmission line damages, can find in time, thereby, repair fast, to reduce the loss.
Embodiment 6, as shown in figure 11, the power transmission line break monitoring and alarming device of the three phase transmission line open circuit conditions being monitored by another kind of the present invention, power transmission line comprises three live wires 1,27,28, zero line 2 and ground wire 32, the power end of live wire 1,27,28 is equipped with power switch 26, and its bias current circuit 5 comprises: two are connected in parallel in the live wire 1 of power transmission line tail end and the impedance 15,16 between the ground 3; A relay 21 that is connected in the power transmission line tail end, a normally closed contact 23 of this relay 21 is connected between impedance 16 and live wire 1 or the ground 3, its normally opened contact 24 is connected between impedance 15 and live wire 1 or the ground 3, and its coil 22 is connected between live wire 1 and the zero line 2; Between the power end of power transmission line, elementary live wire 1 and zero line 2 before being connected on power switch 26, the secondary live wire 1 that is connected with impedance 16 after being connected on power switch 26 and the transformer 17 between the ground wire 32; A relay 18 that is connected in the power transmission line power end, the normally closed contact 19 of this relay 18 are connected between the secondary and live wire 1 or ground wire 32 of transformer 17, and its coil 20 is connected between the live wire 1 and zero line 2 behind the power switch 26.Current detection circuit comprises: current transformer 9, amplifying circuit 10, rectification circuit 11, subtraction circuit 12, amplifying circuit 13 and comparator circuit 14; Current transformer 9 is positioned at the power end of power transmission line, iron core is placed in outside the power transmission line, the measurement output terminal of current transformer 9 links to each other with the input end of amplifying circuit 10, the output terminal of amplifying circuit 10 links to each other with the input end of rectification circuit 11, the output terminal of rectification circuit 11 links to each other with the input end of subtraction circuit 12, this subtraction circuit 12 subtracts each other the signal and an one setting signal of rectification circuit 11 inputs, the output terminal of subtraction circuit 12 links to each other with the input end of another amplifying circuit 13, the output terminal of this amplifying circuit 13 links to each other with the input end of comparator circuit 14, and this comparator circuit 14 is compared the input signal of amplifying circuit 13 with a door signal.The input end of driving circuit 7 links to each other with the output terminal of comparator circuit 14, and the output terminal of driving circuit 7 links to each other with alarm 8, when this driving circuit 7 is output as zero when comparator circuit 14, drives alarm 8 and reports to the police.
Identical with embodiment 3, the described power transmission line break of present embodiment prison warning device power supply state and not power supply state all can monitor the damaged condition of power transmission line.
But, when power switch 26 is stopped power supply, the situation that may occur breakdown damage owing to the negative pole of the transformer among reason the present invention of load discharge 17, generation for fear of this kind situation, as shown in figure 12, between the coil 20 of relay 18 and live wire 1, be connected with an outage time lagged type time relay 31.Because the outage time lagged type time relay 31 is arranged in coil 20 loops of relay 18, thereby, when power switch disconnects, coil 20 time-delays disconnect, its normally closed contact 19 time closings, when normally closed contact was closed, the electric energy in the load bled off, thereby, prevented that well the breakdown situation of transformer negative pole from taking place.
The above-mentioned outage time lagged type time relay also can be connected between coil 20 and the zero line 2.
Also can between the normally closed contact 19 of relay 18 and live wire 1 or ground wire 32, be connected an on-delay type time relay.Power switch when outage, the secondary time-delay conducting of its transformer 17, thereby well avoided transformer 17 secondary because of load discharge breakdown.
In the present embodiment, the normally opened contact 24 of relay 21 also can be connected between inductance 15 and the ground 3, and its normally closed contact 23 also can be connected between inductance 16 and the ground 3.The normally closed contact 19 of relay 18 also can be connected between the secondary and ground wire 32 of transformer 17.
In order to make warning can make things convenient for, pass on timely, the alarm of present embodiment contains a GMS signal projector, when circuit damages, can report to the police by automatic transmission note.
Perhaps alarm contains a GPRS signal projector, when circuit damages, can send signal by wireless network and report to the police.
Perhaps alarm contains a wireless transmitter, and when circuit damaged, it was reported to the police by emitting radio wave.
Alarm also can communicate with wire telephony, and when circuit damaged, alarm was put through phone automatically and reported to the police.
Alarm can also contain a thumper, and when circuit damaged, thumper thundered, thereby reports to the police.
Above-mentioned various alarm is widely used in its field.
Embodiment 7, and as shown in figure 13, by the line broken circuit monitoring alarm of another three phase transmission line of the present invention, power transmission line comprises three live wires 1,27,28 and zero line 2; Its bias current circuit 5 is to be connected in the live wire 1 of power transmission line tail end and the inductance 15 between the ground 3.Current detection circuit comprises: current transformer 9, amplifying circuit 10, rectification circuit 11, subtraction circuit 12, amplifying circuit 13 and comparator circuit 14; Current transformer 9 is positioned at the power end of power transmission line, iron core is placed in outside the power transmission line, the measurement output terminal of current transformer 9 links to each other with the input end of amplifying circuit 10, the output terminal of amplifying circuit 10 links to each other with the input end of rectification circuit 11, the output terminal of rectification circuit 11 links to each other with the input end of subtraction circuit 12, this subtraction circuit 12 subtracts each other the signal and an one setting signal of rectification circuit 11 inputs, the output terminal of subtraction circuit 12 links to each other with the input end of another amplifying circuit 13, the output terminal of this amplifying circuit 13 links to each other with the input end of comparator circuit 14, and this comparator circuit 14 is compared the input signal of amplifying circuit 13 with a door signal.The input end of driving circuit 7 links to each other with the output terminal of comparator circuit 14, and the output terminal of driving circuit 7 links to each other with alarm 8, when this driving circuit 7 is output as zero when comparator circuit 14, drives alarm 8 and reports to the police.
The same with embodiment 6, the described power transmission line break monitoring and alarming device of present embodiment can be reported to the police when power transmission line damages automatically.
Claims (14)
1, power transmission line break monitoring and alarming device (4) is characterized in that:
Comprise:
Be connected on the power transmission line, make the power transmission line tail end produce a bias current circuit (5) that flows out the bias current of power transmission line, this bias current circuit contain the live wire that is connected in the power transmission line tail end with the impedance between (3);
Be used to detect the current detection circuit (6) of the bias current that above-mentioned bias current circuit produces;
Link to each other, when current detection circuit does not detect the bias current of bias current circuit generation, drive the driving circuit (7) that alarm (8) is reported to the police with the output terminal of current detection circuit; And
Alarm (8).
2, power transmission line break monitoring and alarming device according to claim 1 is characterized in that: described bias current circuit (5) is one and is connected in the live wire of power transmission line tail end and the impedance between the ground (3).
3, power transmission line break monitoring and alarming device according to claim 1 is characterized in that:
Described bias current circuit (5) comprising:
Two are connected in parallel in the live wire of power transmission line tail end and the impedance (15,16) between the ground (3);
A relay (21) that is connected in the power transmission line tail end, a normally closed contact (23) of this relay is connected between impedance (16) and live wire or the ground (3), its normally opened contact (24) is connected between impedance (15) and live wire or the ground (3), and its coil (22) is connected between live wire and the zero line (2);
Be positioned at power transmission line power end, elementaryly be connected between power switch (26) live wire and zero line before, secondary live wire that power switch (26) is connected with impedance (16) afterwards and the transformer (17) between the ground (3) of being connected on;
A relay (18) that is connected in the power transmission line power end, the normally closed contact of this relay (19) are connected between the secondary and live wire or ground (3) of transformer (17), and its coil (20) is connected between the live wire and zero line (2) behind the power switch (26).
4, power transmission line break monitoring and alarming device according to claim 1 is characterized in that: described bias current circuit (5) comprising:
Two are connected in parallel in the live wire of power transmission line tail end and the impedance between the ground (3);
A relay (21) that is connected in the power transmission line tail end, a normally closed contact (23) of this relay is connected between impedance (16) and live wire or the ground (3), its normally opened contact (24) is connected between impedance (15) and live wire or the ground (3), and its coil (22) is connected between live wire and the zero line (2);
The electric capacity (25) that the preceding live wire of power end, an end and power switch (26) that is positioned at power transmission line links to each other, the other end links to each other with the back live wire that is connected with impedance (16) of power switch (26);
A relay (18) that is connected in the power transmission line power end, a normally closed contact (19) of this relay are connected between the end and live wire of electric capacity (25), and its coil (20) is connected between power switch (26) live wire and zero line (2) afterwards.
5, power transmission line break monitoring and alarming device according to claim 3 is characterized in that: be connected with the outage time lagged type time relay (31) between the coil (20) of the described relay (18) that is connected in the power transmission line power end and live wire or the zero line (2).
6, power transmission line break monitoring and alarming device according to claim 3 is characterized in that: be connected with the on-delay type time relay between the normally closed contact (19) of the described relay (18) that is connected in the power transmission line power end and live wire or the zero line (2).
7, according to any one described power transmission line break monitoring and alarming device in the claim 1 to 6, it is characterized in that: described current detection circuit (6) comprising: current transformer (9), amplifying circuit (10), rectification circuit (11), subtraction circuit (12), amplifying circuit (13) and comparator circuit (14); Power end, iron core that current transformer (9) is positioned at power transmission line are placed in outside the power transmission line, the measurement output terminal of current transformer (9) links to each other with the input end of amplifying circuit (10), the output terminal of amplifying circuit (10) links to each other with the input end of rectification circuit (11), the output terminal of rectification circuit (11) links to each other with the input end of subtraction circuit (12), this subtraction circuit (12) subtracts each other signal and a setting signal of rectification circuit (13) input, and the output terminal of subtraction circuit (12) links to each other with the driving circuit (7) that drives alarm (8) warning.
8, according to any one described power transmission line break monitoring and alarming device in the claim 1 to 6, it is characterized in that: described current detection circuit (6) comprising: current transformer (9), amplifying circuit (10), rectification circuit (11), subtraction circuit (12), amplifying circuit (13) and comparator circuit (14); Current transformer (9) is positioned at the power end of power transmission line, iron core is placed in outside the power transmission line, the measurement output terminal of current transformer (9) links to each other with the input end of amplifying circuit (10), the output terminal of amplifying circuit (10) links to each other with the input end of rectification circuit (11), the output terminal of rectification circuit (11) links to each other with the input end of subtraction circuit (12), this subtraction circuit (12) subtracts each other the signal and the setting signal of rectification circuit (13) input, the output terminal of subtraction circuit (12) links to each other with the input end of another amplifying circuit (13), the output terminal of this amplifying circuit (13) links to each other with the input end of comparator circuit (14), this comparator circuit (14) is compared the input signal of amplifying circuit (13) with a door signal, the output terminal of comparator circuit (14) links to each other with the driving circuit (7) that drives alarm (8) warning.
9, any one described power transmission line break monitoring and alarming device in the claim 1 to 6, it is characterized in that: described current detection circuit (6) comprising: be arranged in the outer current transformer (9) of branch road that power transmission line tail end, iron core are placed in all impedance places of bias current circuit (5).
10, according to any one described power transmission line break monitoring and alarming device in the claim 1 to 6, it is characterized in that: described impedance is inductance, electric capacity or resistance, the perhaps series and parallel of inductance, resistance, electric capacity combination.
11, the described power transmission line break monitoring and alarming device of claim 7 is characterized in that: described impedance is inductance, electric capacity or resistance, the perhaps series and parallel of inductance, resistance, electric capacity combination.
12, the described power transmission line break monitoring and alarming device of claim 8 is characterized in that: described impedance is inductance, electric capacity or resistance, the perhaps series and parallel of inductance, resistance, electric capacity combination.
13, the described power transmission line break monitoring and alarming device of claim 9 is characterized in that: described impedance is inductance, electric capacity or resistance, the perhaps series and parallel of inductance, resistance, electric capacity combination.
14, according to any one described power transmission line break monitoring and alarming device in the claim 1 to 6, it is characterized in that:
Described alarm (8) is for can send the alarm that note is reported to the police automatically;
Perhaps for can dial the alarm that wire telephony is reported to the police automatically;
Perhaps for can send the alarm that radiowave is reported to the police automatically;
Also can be for sending the alarm that voice signal is reported to the police by thumper.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100351992A CN1880965B (en) | 2005-06-14 | 2005-06-14 | Power transmission line break monitoring and alarming device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2005100351992A CN1880965B (en) | 2005-06-14 | 2005-06-14 | Power transmission line break monitoring and alarming device |
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| CN1880965A true CN1880965A (en) | 2006-12-20 |
| CN1880965B CN1880965B (en) | 2010-04-14 |
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| CN2005100351992A Active CN1880965B (en) | 2005-06-14 | 2005-06-14 | Power transmission line break monitoring and alarming device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608482A (en) * | 2010-12-30 | 2012-07-25 | 通用电气公司 | Methods and systems involving monitoring circuit connectivity |
| WO2013004146A1 (en) * | 2011-07-01 | 2013-01-10 | 厦门市老科学技术工作者协会 | Online alternating current detection device and method |
| CN108107340A (en) * | 2016-11-24 | 2018-06-01 | 天津曼洛尔科技有限公司 | A kind of circuit breaker detecting module |
| CN109444634A (en) * | 2018-11-15 | 2019-03-08 | 国网山西省电力公司大同供电公司 | A kind of 10kV overhead transmission line lightning-caused breaking warning device based on crash sensor |
| CN112180219A (en) * | 2020-10-13 | 2021-01-05 | 南京科远智慧科技集团股份有限公司 | Cable circuit of industrial digital quantity output loop and implementation method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2751483B1 (en) * | 1996-07-18 | 1998-08-28 | Gec Alsthom T & D Sa | METHOD FOR PROTECTING THE BREAKDOWN OF A CIRCUIT BREAKER |
| CN2433635Y (en) * | 1999-10-26 | 2001-06-06 | 南航(集团)汕头航空有限公司 | Testing instrument for fault of conducting wire |
| CN2430804Y (en) * | 2000-06-01 | 2001-05-16 | 西安科技学院 | Intelligent monitoring protector for breaker and motor fault |
| CN2807270Y (en) * | 2005-06-15 | 2006-08-16 | 辛平野 | Power transmission line broken circuit monitoring alarm device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608482A (en) * | 2010-12-30 | 2012-07-25 | 通用电气公司 | Methods and systems involving monitoring circuit connectivity |
| CN102608482B (en) * | 2010-12-30 | 2016-05-18 | 通用电气公司 | For the system of observation circuit connectivity |
| WO2013004146A1 (en) * | 2011-07-01 | 2013-01-10 | 厦门市老科学技术工作者协会 | Online alternating current detection device and method |
| US9279833B2 (en) | 2011-07-01 | 2016-03-08 | Xuanlai You | Online alternating current detection device and method |
| CN108107340A (en) * | 2016-11-24 | 2018-06-01 | 天津曼洛尔科技有限公司 | A kind of circuit breaker detecting module |
| CN109444634A (en) * | 2018-11-15 | 2019-03-08 | 国网山西省电力公司大同供电公司 | A kind of 10kV overhead transmission line lightning-caused breaking warning device based on crash sensor |
| CN109444634B (en) * | 2018-11-15 | 2020-11-06 | 国网山西省电力公司大同供电公司 | 10kV overhead line thunderbolt broken string alarm device based on collision sensor |
| CN112180219A (en) * | 2020-10-13 | 2021-01-05 | 南京科远智慧科技集团股份有限公司 | Cable circuit of industrial digital quantity output loop and implementation method |
| CN112180219B (en) * | 2020-10-13 | 2024-02-27 | 南京科远智慧科技集团股份有限公司 | Cable circuit of industrial digital quantity output loop and implementation method |
Also Published As
| Publication number | Publication date |
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| CN1880965B (en) | 2010-04-14 |
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