CN102855723A - Device and method for monitoring stealing cutting prevention of power cables of motor - Google Patents
Device and method for monitoring stealing cutting prevention of power cables of motor Download PDFInfo
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Abstract
The invention discloses a device for monitoring stealing cutting prevention of power cables of a motor. A power circuit is connected onto a diphase line of a three-phase alternating-current power source, the connection position is positioned on a lower portion of a power switch of the three-phase alternating-current power source and on an upper portion of a motor control contactor, a halt current monitoring circuit is connected with the power circuit and a lower contact monitored line of the motor control contactor, return circuit current when the monitoring circuit halts can be obtained from the a monitored line return circuit, an operating current monitoring circuit is connected with a current mutual inductor on a three-phase alternating-current power line, line current during operation of the motor can be obtained from the current mutual inductor, the halt current monitoring circuit and the operation current monitoring circuit are connected into a state and current comparison arithmetic circuit to judge line operation states and whether line cables are stolen and cut or not, an alarming signal output circuit is connected with the state and current comparison arithmetic circuit, a monitoring state display circuit is simultaneously connected with a halt state and current arithmetic circuit, an operation state and current arithmetic circuit and the alarming signal output circuit.
Description
Technical field
The present invention relates to anti-theft monitoring device for power cable of electric motor and monitoring method.
Background technology
Generally there are a lot of manufacturing machines in large enterprise, particularly also have a lot of outdoor manufacturing machines, for manufacturing machine provide power the motor power cable since its wire diameter thick, copper content is many, along with the rising of copper valency, this part cable becomes minority lawless person's pilferage target recently.In a single day be cut for manufacturing machine provides the motor power cable of power, will have a strong impact on normally carrying out of enterprise's production.Particularly some the time equipment motor cable opened of stopping time be cut, if can not in time find to take measures, when production technology needs the operation of this part equipment by the time and in time starting operation gently then causing stopping production to affect enterprises production efficiency, and is heavy then will cause serious accident.Owing to originally do not have good appropriate technology to prevent and reported to the police, cause lawless person's pilferage behavior to repeatedly succeed, the steal phenomenon of this part cable is spread day by day, the normal production of enterprise is caused serious threat.
Existing motor power cable theft-prevention technology has: Chinese patent CN01239511.0 discloses a kind of cable theft-prevention clamp; Chinese patent CN200820217365.X discloses a kind of distribution transformer theft-judge sensor; Above-mentioned two patented technology major defects are to transform field apparatus, and its workload is large, and field apparatus dispersion alarm set point line attachment is long, and performance difficulty is difficult to popularize and uses.Chinese patent CN200920035361.4 discloses theftproof alarming terminal for electric power facility, need to adopt special signal to occur and receiving device, its complex structure, the Installation and Debugging difficulty, particularly in the multiloop connected system, use many mutual UNICOMs of warning device detection signal, be difficult to correctly distinguish which bar loop cable has occured cut off fault.
Prior art is difficult to also that for the motor power cable situation that is cut suitable warning means are arranged, so current main or way of the artificial inspection of employing, artificial inspection for large-scale inspection except take a lot of work, time-consuming and untimely, mainly be that the probability just in time found when being cut of cable is extremely low, so that lawless person's pilferage behavior is gone smoothly again and again, encouraged lawless person's pilferage bluster.
Summary of the invention
The object of the present invention is to provide a kind of anti-theft monitoring device for power cable of electric motor and monitoring method, this monitoring device and method make no matter the motor power cable is in service at cable energising motor, or cable no power motor be in out of service in, as long as be cut and send immediately alerting signal once the motor power cable occurs, be conducive in time organize the relevant personnel to arrive the cable scene that is cut.
To achieve these goals, the present invention adopts following technical scheme:
A kind of anti-theft monitoring device for power cable of electric motor comprises power circuit, shuts down current monitoring circuit, running current observation circuit, state and current ratio than computing circuit, alerting signal output circuit and monitoring state display circuit;
Described power circuit is comprised of monitoring device working power and monitoring shutdown power supply two parts, power circuit is connected on the two-phase circuit of three-phase alternating-current supply, and described link position is positioned at the power switch bottom of three-phase alternating-current supply, the top of electric motor control contactor;
Described shutdown current monitoring circuit connects the monitored circuit of contact under monitoring shutdown power supply and the electric motor control contactor, the loop current when obtaining the Monitoring Line shutdown from monitored line loop;
Described running current observation circuit connects the current transformer on the three-phase ac power cord road, the line current when obtaining the motor operation from current transformer;
Described shutdown current monitoring circuit and running current observation circuit access described state and current ratio than computing circuit, state and current ratio than computing circuit by stopped status and current operator circuit and running status and current operator the electric circuit constitute, state and current ratio are than the current values of computing circuit according to shutdown current monitoring circuit and running current observation circuit, the judgement of carrying out the circuit running status and having or not line cord to be cut off by pilferage;
Described alerting signal output circuit connects state and current ratio than computing circuit, than the signal of computing circuit output, sends the alerting signal that line cord is cut off by pilferage according to state and current ratio;
Described monitoring state display circuit connects stopped status and current operator circuit, running status and current operator circuit and alerting signal output circuit simultaneously, and circuit is in stopped status, running status or cable and is cut off state by pilferage respectively.
A kind of motor power cable theft-prevention cuts monitoring method:
Under motor power cable no power motor halted state, monitoring current Ia carries out the whether normal monitoring of circuit when utilizing described monitoring device to provide a circuit to shut down;
Under power cable energising motoring, utilize three-phase supply circuit motor operating current Ib to obtain secondary running current Ic through current transformer and access described monitoring device, carry out the whether normal monitoring of circuit;
Under normal circumstances, the motor power cable line only has two states, that is: the running status of switching on or outage halted state, and described monitoring device can monitor shuts down electric current I a or running current Ic; Do not shut down electric current I a or running current Ic if described monitoring device all monitors, represent that then the motor power cable is cut off, described monitoring device can send alerting signal immediately.
Monitoring device of the present invention provides a path monitoring electric current I a by monitoring device under power cable no power motor halted state, carry out the whether normal monitoring of circuit; Under power cable energising motoring, utilize circuit motor operating current Ib to obtain secondary current Ic access monitoring device through current transformer, carry out the whether normal monitoring of circuit.As long as be cut and send immediately alerting signal once the motor power cable occurs, be conducive in time organize the relevant personnel to arrive the cable scene that is cut.If the power cable line maintenance, then power switch must be disconnected, and this moment, the working power of monitoring device was cut off, and monitoring device is not worked, and does not send false alarm so monitoring device of the present invention can not repaiied because of the breakage of circuit electric-examination.
Anti-theft monitoring device for power cable of electric motor of the present invention need not at the scene erecting equipment, as long as at the cable power output end, namely at electric indoor location monitoring device of the present invention, just can reach the purpose that cable line is monitored by the monitoring in electric panel room.Monitoring device of the present invention is simple in structure, need not extra power supply and complicated mechanism, as long as simple access monitoring device of the present invention can carry out monitoring and the warning that cable is cut on the circuit of needs monitoring.
Description of drawings
Fig. 1 is anti-theft monitoring device for power cable of electric motor control principle synoptic diagram of the present invention (monitoring state when motor is shut down);
Fig. 2 is monitoring device control principle drawing of the present invention (monitoring state during the motor operation);
Fig. 3 is anti-theft monitoring device for power cable of electric motor electrical diagram of the present invention;
Fig. 4 is the monitoring device working power circuit;
Fig. 5 is for shutting down current monitoring circuit;
Fig. 6 is the running current observation circuit;
Fig. 7 is that stopped status and current ratio are than computing circuit;
Fig. 8 is that running status and current ratio are than computing circuit;
Fig. 9 is the alerting signal output circuit;
Figure 10 is the monitoring state display circuit.
Among the figure: 1 power circuit (working power); 2 shut down current monitoring circuit (monitoring shutdown); 3 running current observation circuits (operational monitoring); 4 states and current ratio are than computing circuit (s operation control, signal comparison operation circuit); 41 stopped statuss and current ratio are than computing circuit; 42 running statuses and current ratio be than computing circuit, 5 alerting signal output circuits (output of reporting to the police), 6 monitoring state display circuits.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
Referring to Fig. 3, a kind of anti-theft monitoring device for power cable of electric motor comprises power circuit 1, shuts down current monitoring circuit 2, running current observation circuit 3, state and current ratio than computing circuit 4, alerting signal output circuit 5 and monitoring state display circuit 6.
Described power circuit 1 is comprised of monitoring device working power and monitoring shutdown power supply two parts, power circuit 1 is connected to two-phase circuit a, b 2 points of three-phase alternating-current supply, for described monitoring device provides working power, 2 of described link position a, b are positioned at the power switch bottom of three-phase alternating-current supply, the top of electric motor control contactor;
Described power circuit 1 mainly is comprised of main fuse FU, power transformer BT, transistor fairing ZL1, filter capacitor C1, C2, three-terminal voltage-stabilizing pipe VW1; Circuit function is: by A1, A2 end (a, b point) two-phase alternating current power supply 380V access output voltage behind power transformer BT, transistor fairing ZL1, filter capacitor C1, C2 and three-terminal voltage-stabilizing pipe VW1, offer the monitoring device working power; Referring to Fig. 4.
The monitored circuit of contact c, d point under the monitoring shutdown power supply of described shutdown current monitoring circuit 2 connection power circuits 1 and the electric motor control contactor, the loop current when obtaining the Monitoring Line shutdown from monitored line loop; Described shutdown current monitoring circuit 2 mainly is comprised of current-limiting resistance R1, R2, transistor fairing ZL2, photoelectrical coupler current-limiting resistance R4, RC filtering R3, C3 and photocoupler GL1, circuit function is: by upper contact a, b point (A1, A2 end) the two-phase alternating current power supply 380V access of contactor, the monitoring power supply after current-limiting resistance R1 current limliting outputs to lower contact c, the d point (B1, B2 end) of contactor; Exchange monitoring current behind current-limiting resistance R2, ZL2 is transformed to direct current through the transistor fairing, triggers photocoupler GL1 after the RC filtering again, makes photocoupler GL1 conducting, output low level to stopped status and current ratio than computing circuit 41; Referring to Fig. 5.
The Current Transmit that described running current observation circuit 3 connects on the three-phase ac power cord road, the line current when obtaining the motor operation from Current Transmit; Described running current observation circuit 3 mainly is comprised of internal current mutual inductor CT, transistor fairing ZL2 and RC filtering C4, R5, circuit function: from the access of device current transformer secondary circuit (H3, H4 end), motor exchanges monitoring current and is transformed to direct current through internal current mutual inductor CT and transistor fairing ZL2, again after RC filtering C4, R5 filtering the output high level to running status and current ratio than computing circuit 42; Referring to Fig. 6.
Described shutdown current monitoring circuit 2 and the running current observation circuit 3 described states of access and current ratio are than computing circuit 4, state and current ratio are than the current values of computing circuit 4 according to shutdown current monitoring circuit 2 and running current observation circuit 3, the judgement of carrying out the circuit running status and having or not line cord to be cut off by pilferage; Described state and current ratio mainly are comprised of stopped status and current operator circuit 41 and running status and current operator circuit 42 than computing circuit 4; Described stopped status and current operator circuit 41 form by shutting down hang oneself resistance R 6, operational amplifier F1, F2, transport and placing device F1 benchmark R7, R9, transport and placing device F2 benchmark R21, R10 and input resistance R8 of current monitoring circuit 2 photocoupler power supplys; Circuit function: signal is relatively exported respectively in the same way output by shutting down current monitoring circuit 2 inputs to signal by two operational amplifier F1, F2; Input low level, output low level.When cable line was normal, from shutting down current monitoring circuit 2 input low levels, this circuit output low level was to monitoring state display circuit 6, alerting signal output circuit 5; Referring to Fig. 7.
Described running status and current operator circuit 42 mainly are comprised of input resistance R12, operational amplifier F3, F4, transport and placing device F3 benchmark R11, R13, coupling input resistance R14 and transport and placing device F4 benchmark R15, R16; Circuit function: signal is relatively exported by two operational amplifier F3, F4 by 3 inputs of running current observation circuit, and operational amplifier F3 oppositely exports, operational amplifier F3 input high level, output low level.Operational amplifier F4 exports in the same way, F4 input low level, output low level.When cable line was normal, from running current observation circuit 3 input high levels, this circuit output low level was to monitoring state display circuit 6, alerting signal output circuit 5; Referring to Fig. 8.
Described alerting signal output circuit 5 connects state and current ratio than computing circuit 4, than the signal of computing circuit 4 outputs, sends the alerting signal that line cord is cut off by pilferage according to state and current ratio; Described alerting signal output circuit 5 mainly is comprised of NPN transistor BT1, base stage working ressitance R17 and signal relay coil J; Circuit function: this alerting signal output circuit 5 is on-off circuit, the alerting signal power stage, and the alarm condition signal outputs to monitoring state display circuit 6.State and current ratio are than computing circuit 4 input low levels, and NPN transistor BT1 ends shutoff, and relay J discharges, and output signal is to monitoring state display circuit 6 output high level.When cable line was normal, than computing circuit 4 input low levels, relay J discharged from state and current ratio, and output signal is to monitoring state display circuit 6 output high level, and the disconnected cable status lamps of the emitting led pilot lamp LD3 in the monitoring state display circuit 6 extinguish; Referring to Fig. 9.
Described monitoring state display circuit 6 connects stopped status and current operator circuit 41, running status and current operator circuit 42 and alerting signal output circuit 5 simultaneously, and circuit is in stopped status, running status or cable and is cut off state by pilferage respectively; Described monitoring state display circuit 6 is comprised of emitting led pilot lamp LD1, LD2, LD3, LED current-limiting resistance R18, R19, R20; Circuit function: line status shows.LD1 lights, and equipment does not move, and circuit is normal.LD2 lights, the equipment operation, and circuit is normal.LD3 lights, and circuit is cut off.LED negative terminal access signal, low level LED lights, and high level LED extinguishes; Referring to Figure 10.
A kind of motor power cable theft-prevention cuts monitoring method, implements on aforementioned anti-theft monitoring device for power cable of electric motor basis, referring to Fig. 1, Fig. 2, Fig. 3.
Under motor power cable no power motor halted state, monitoring current Ia carries out the whether normal monitoring of circuit when utilizing described monitoring device to provide a circuit to shut down;
Under power cable energising motoring, utilize three-phase supply circuit motor operating current Ib to obtain secondary running current Ic through current transformer and access described monitoring device, carry out the whether normal monitoring of circuit;
Under normal circumstances, the motor power cable line only has two states, that is: the running status of switching on or outage halted state, and described monitoring device can monitor shuts down electric current I a or running current Ic; Do not shut down electric current I a or running current Ic if described monitoring device all monitors, represent that then the motor power cable is cut off, described monitoring device can send alerting signal immediately.
1, under motor power cable no power motor halted state, in the time of need to overhauling except logicalnot circuit, three-phase power switch is in closure state all the time under normal circumstances, the power circuit 1 of described monitoring device is connected to two-phase circuit a, b 2 points of three-phase alternating-current supply, for monitoring device provides working power, monitoring device is initially located in the monitoring state; 2 of described link position a, b are positioned at the power switch bottom of three-phase alternating-current supply, the top of electric motor control contactor, referring to Fig. 1.
This moment since motor do not work, be in out of service in, the contactor contact of three-phase supply circuit is in off-state, power cable service interruption electricity.Monitoring shutdown electric current I a flows into the power circuit 1 of described monitoring device from contactor upper contact a point, after processing (current-limiting circuit is placed in the power circuit 1), current limliting flows out to contact c point under the described contactor, enter cold power cable circuit, monitoring current Ia flow into an end of motor winding line through a heart yearn (phase line) of power cable, by flow out to another root heart yearn (another root phase line) of power cable after the motor winding line from the other end, monitoring current Ia this root heart yearn of flowing through turns back to contact d point under this phase contact, flow into the shutdown current monitoring circuit 2 of described monitoring device from the d point, after treatment circuit in the dynamo-electric stream of the stop over observation circuit 2 and current limliting are processed, monitoring current Ia flows out to the other end of power circuit 1 from shutting down current monitoring circuit 2, flow out to this phase contact upper contact b point again and consist of shutdown current monitoring loop;
Described monitoring device shutdown this moment current monitoring circuit 2 continues to have a small monitoring current Ia to pass through, shut down the current monitoring circuit 2 monitoring current signal that this is small and send into state and current ratio than computing circuit 4, state and current ratio compare computing than computing circuit 4 with signal amplitude and the motor shutdown reference value that receives, and obtain cable line and judge normally; Monitoring state display circuit 6 obtains shutting down the output signal of current monitoring circuit 2, and circuit is in the orderly closedown state.
If the power cable circuit is cut off by pilferage; the loop of monitoring shutdown electric current I a is disconnected; the shutdown current monitoring circuit 2 of described monitoring device does not have monitoring current Ia to pass through; state and current ratio do not receive than computing circuit 4 and shut down current monitoring circuit 2 greater than the signal output of specified reference value signal amplitude; running current observation circuit 3 is not exported greater than the signal of specified reference value signal amplitude yet simultaneously; state and current ratio obtain the judgement that cable line is cut off than computing circuit 4; state and current ratio are exported to alerting signal output circuit 5 than computing circuit 4 with judged result; make the adhesive of warning output relay send alerting signal, and monitoring state display circuit 6 show the state that cable is cut off.
2, be in the running status at power cable energising motor, the power switch of three-phase supply circuit is in closure state all the time, the power circuit 1 of described monitoring device is connected to two-phase circuit a, b 2 points of three-phase alternating-current supply, for monitoring device provides working power, monitoring device is initially located in the monitoring state; 2 of described link position a, b are positioned at the power switch bottom of three-phase alternating-current supply, the top of electric motor control contactor, referring to Fig. 2.
This moment, the contactor contact was in closure state, the contactor upper contact a of three-phase supply circuit, b point respectively with lower contact c, d point short circuit, the monitoring circuit of former monitoring shutdown electric current I a is by short circuit, the shutdown current monitoring circuit 2 of monitoring device is monitored less than electric current.This moment, motor running current Ib flow through from the three-phase supply circuit, obtain the running current observation circuit 3 that secondary running current Ic is sent to described monitoring device after being installed in the current transformer induction on the circuit, running current observation circuit 3 is sent into state and current ratio than computing circuit 4 with this current signal, state and current ratio compare computing than computing circuit 4 with signal amplitude and the motor operation reference value that receives, and obtain cable line and judge normally; Monitoring state display circuit 6 obtains running current observation circuit 3 output signals, and circuit is in normal operating condition.
If the power cable circuit is cut off by pilferage; the loop of motor operating current Ib is disconnected; the running current observation circuit 3 of described monitoring device does not monitor electric current I c to be passed through; state and current ratio do not receive running current observation circuit 3 greater than the signal output of specified reference value signal amplitude than computing circuit 4; shutting down simultaneously current monitoring circuit 2 does not export greater than the signal of specified reference value signal amplitude yet; state and current ratio obtain the judgement that cable line is cut off than computing circuit 4; state and current ratio are exported to alerting signal output circuit 5 than computing circuit 4 with judged result; make the adhesive of warning output relay send alerting signal, and monitoring state display circuit 6 show the state that cable is cut off.
3, power cable line maintenance, the power switch of three-phase alternating current is disconnected, the described monitoring device power supply of losing the job is in off position, the warning of monitoring device output can not moved output alarm signal because of the power supply of losing the job yet, and does not send the false alarm signal so can not repair because of the breakage of circuit electric-examination yet.
Being preferred embodiment of the present invention only below, is not for limiting protection scope of the present invention, therefore, all any modifications of doing within the spirit and principles in the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an anti-theft monitoring device for power cable of electric motor is characterized in that: comprise power circuit, shut down current monitoring circuit, running current observation circuit, state and current ratio than computing circuit, alerting signal output circuit and monitoring state display circuit;
Described power circuit is comprised of monitoring device working power and monitoring shutdown power supply two parts, power circuit is connected on the two-phase circuit of three-phase alternating-current supply, and described link position is positioned at the power switch bottom of three-phase alternating-current supply, the top of electric motor control contactor;
Described shutdown current monitoring circuit connects the monitored circuit of contact under monitoring shutdown power supply and the electric motor control contactor, the loop current when obtaining the Monitoring Line shutdown from monitored line loop;
Described running current observation circuit connects the current transformer on the three-phase ac power cord road, the line current when obtaining the motor operation from current transformer;
Described shutdown current monitoring circuit and running current observation circuit access described state and current ratio than computing circuit, state and current ratio than computing circuit by stopped status and current operator circuit and running status and current operator the electric circuit constitute, state and current ratio are than the current values of computing circuit according to shutdown current monitoring circuit and running current observation circuit, the judgement of carrying out the circuit running status and having or not line cord to be cut off by pilferage;
Described alerting signal output circuit connects state and current ratio than computing circuit, than the signal of computing circuit output, sends the alerting signal that line cord is cut off by pilferage according to state and current ratio;
Described monitoring state display circuit connects stopped status and current operator circuit, running status and current operator circuit and alerting signal output circuit simultaneously, and circuit is in stopped status, running status or cable and is cut off state by pilferage respectively.
2. anti-theft monitoring device for power cable of electric motor according to claim 1, it is characterized in that: described power circuit mainly is comprised of power transformer BT, transistor fairing ZL1, filter capacitor C1, C2, three-terminal voltage-stabilizing pipe VW1; Two-phase alternating current power supply 380V access output voltage behind power transformer BT, transistor fairing ZL1, filter capacitor C1, C2 and three-terminal voltage-stabilizing pipe VW1 offers the monitoring device working power.
3. anti-theft monitoring device for power cable of electric motor according to claim 1, it is characterized in that: described shutdown current monitoring circuit mainly is comprised of current-limiting resistance R1, R2, transistor fairing ZL2, photoelectrical coupler current-limiting resistance R4, RC filtering R3, C3 and photocoupler GL1, two-phase alternating current power supply 380V is after upper contact (a, the b point) access of contactor, and the monitoring power supply after current-limiting resistance R1 current limliting outputs to the lower contact (c, d point) of contactor; Exchange monitoring current behind current-limiting resistance R2, ZL2 is transformed to direct current through the transistor fairing, triggers photocoupler GL1 after the RC filtering again, makes photocoupler GL1 conducting, output low level to stopped status and current ratio than computing circuit.
4. anti-theft monitoring device for power cable of electric motor according to claim 1, it is characterized in that: described running current observation circuit mainly is comprised of internal current mutual inductor CT, transistor fairing ZL2 and RC filtering C4, R5, exchange monitoring current from the motor of device current transformer secondary circuit access and be transformed to direct current through internal current mutual inductor CT and transistor fairing ZL2, again after RC filtering C4, R5 filtering the output high level to running status and current ratio than computing circuit.
5. anti-theft monitoring device for power cable of electric motor according to claim 1 is characterized in that: described stopped status and current operator main circuit will form by shutting down hang oneself resistance R 6, operational amplifier F1, F2, transport and placing device F1 benchmark R7, R9, transport and placing device F2 benchmark R21, R10 and input resistance R8 of current monitoring circuit photocoupler power supply; Signal is relatively exported respectively in the same way output by shutting down the current monitoring circuit input to signal by two operational amplifier F1, F2; Input low level, output low level; When cable line was normal, from shutting down the current monitoring circuit input low level, this circuit output low level was to monitoring state display circuit, alerting signal output circuit.
6. anti-theft monitoring device for power cable of electric motor according to claim 1, it is characterized in that: described running status and current operator main circuit will be comprised of input resistance R12, operational amplifier F3, F4, transport and placing device F3 benchmark R11, R13, coupling input resistance R14 and transport and placing device F4 benchmark R15, R16; Signal is relatively exported by two operational amplifier F3, F4 by the input of running current observation circuit, and operational amplifier F3 oppositely exports, operational amplifier F3 input high level, output low level; Operational amplifier F4 exports in the same way, F4 input low level, output low level; When cable line was normal, from running current observation circuit 3 input high levels, this circuit output low level was to monitoring state display circuit, alerting signal output circuit.
7. anti-theft monitoring device for power cable of electric motor according to claim 1, it is characterized in that: described alerting signal output circuit mainly is comprised of NPN transistor BT1, base stage working ressitance R17 and signal relay coil J; This alerting signal output circuit is on-off circuit, the alerting signal power stage, and the alarm condition signal outputs to the monitoring state display circuit.
8. the motor power cable theft-prevention implemented of an anti-theft monitoring device for power cable of electric motor according to claim 1 cuts monitoring method: it is characterized in that:
Under motor power cable no power motor halted state, monitoring current Ia carries out the whether normal monitoring of circuit when utilizing described monitoring device to provide a circuit to shut down;
Under power cable energising motoring, utilize three-phase supply circuit motor operating current Ib to obtain secondary running current Ic through current transformer and access described monitoring device, carry out the whether normal monitoring of circuit;
Under normal circumstances, the motor power cable line only has two states, that is: the running status of switching on or outage halted state, and described monitoring device can monitor shuts down electric current I a or running current Ic; Do not shut down electric current I a or running current Ic if described monitoring device all monitors, represent that then the motor power cable is cut off, described monitoring device can send alerting signal immediately.
9. motor power cable theft-prevention according to claim 8 cuts monitoring method: it is characterized in that:
Under motor power cable no power motor halted state, three-phase power switch is in closure state all the time under normal circumstances, the power circuit of described monitoring device is connected to two-phase circuit a, b 2 points of three-phase alternating-current supply, for monitoring device provides working power, 2 of described link position a, b are positioned at the power switch bottom of three-phase alternating-current supply, the top of electric motor control contactor;
This moment, the contactor contact of three-phase supply circuit was in off-state, monitoring shutdown electric current I a flows into the power circuit of described monitoring device from contactor upper contact a point, after processing, current limliting flows out to contact c point under the described contactor, enter cold power cable circuit, monitoring current Ia flow into an end of motor winding line through a heart yearn of power cable, by flow out to another root heart yearn of power cable after the motor winding line from the other end, monitoring current Ia this root heart yearn of flowing through turns back to contact d point under this phase contact, flow into the shutdown current monitoring circuit of described monitoring device from the d point, after treatment circuit in the dynamo-electric stream of the stop over observation circuit and current limliting are processed, monitoring current Ia flows out to the other end of power circuit from shutting down current monitoring circuit, flow out to this phase contact upper contact b point again and consist of shutdown current monitoring loop;
Described monitoring device shutdown this moment current monitoring circuit continues to have a small monitoring current Ia to pass through, shut down the current monitoring circuit monitoring current signal that this is small and send into state and current ratio than computing circuit, compare than the computing circuit computing through state and current ratio, obtain cable line and judge normally;
If the power cable circuit is cut off by pilferage; the loop of monitoring shutdown electric current I a is disconnected; the shutdown current monitoring circuit of described monitoring device does not have monitoring current Ia to pass through; compare than the computing circuit computing through state and current ratio; obtain the judgement that cable line is cut off; connection status and current ratio make the adhesive of warning output relay send alerting signal than the alerting signal output circuit output alarm signal of computing circuit.
10. motor power cable theft-prevention according to claim 8 cuts monitoring method: it is characterized in that:
Be in the running status at power cable energising motor, the power switch of three-phase supply circuit is in closure state all the time, the power circuit of described monitoring device is connected to two-phase circuit a, b 2 points of three-phase alternating-current supply, for monitoring device provides working power, 2 of described link position a, b are positioned at the power switch bottom of three-phase alternating-current supply, the top of electric motor control contactor;
This moment, the contactor contact was in closure state, the contactor upper contact a of three-phase supply circuit, b point respectively with lower contact c, d point short circuit, motor running current Ib flows through from the three-phase supply circuit, obtain the running current observation circuit that secondary running current Ic is sent to described monitoring device after being installed in the current transformer induction on the circuit, the running current observation circuit is sent into state and current ratio than computing circuit with this current signal, compare than the computing circuit computing through state and current ratio, obtain cable line and judge normally;
If the power cable circuit is cut off by pilferage, the loop of motor operating current Ib is disconnected, the running current observation circuit of described monitoring device does not monitor electric current I c to be passed through, compare than the computing circuit computing through state and current ratio, obtain the judgement that cable line is cut off, connection status and current ratio make the adhesive of warning output relay send alerting signal than the alerting signal output circuit output alarm signal of computing circuit.
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| CN201110180465.6A CN102855723B (en) | 2011-06-30 | 2011-06-30 | Device and method for monitoring stealing cutting prevention of power cables of motor |
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| CN201110180465.6A CN102855723B (en) | 2011-06-30 | 2011-06-30 | Device and method for monitoring stealing cutting prevention of power cables of motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107545709A (en) * | 2016-06-29 | 2018-01-05 | 上海宝钢化工有限公司 | A kind of more spelling cable break alarm devices |
| CN108230596A (en) * | 2018-02-12 | 2018-06-29 | 国网山东省电力公司平阴县供电公司 | A kind of bench type burglar alarm device of distribution transformer and method |
| US11762039B2 (en) | 2019-03-11 | 2023-09-19 | Crouzet Automatismes | Electrical installation comprising a monitoring module |
| US11914002B2 (en) | 2019-03-11 | 2024-02-27 | Crouzet Automatismes | Electrical installation comprising a monitoring module |
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| CN2206966Y (en) * | 1994-07-13 | 1995-09-06 | 齐国庆 | Power cable anti-theft siren of three-phase electrical machinery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107545709A (en) * | 2016-06-29 | 2018-01-05 | 上海宝钢化工有限公司 | A kind of more spelling cable break alarm devices |
| CN108230596A (en) * | 2018-02-12 | 2018-06-29 | 国网山东省电力公司平阴县供电公司 | A kind of bench type burglar alarm device of distribution transformer and method |
| US11762039B2 (en) | 2019-03-11 | 2023-09-19 | Crouzet Automatismes | Electrical installation comprising a monitoring module |
| US11914002B2 (en) | 2019-03-11 | 2024-02-27 | Crouzet Automatismes | Electrical installation comprising a monitoring module |
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|---|---|
| CN102855723B (en) | 2014-10-01 |
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