CN102855723B - 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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- CN102855723B CN102855723B CN201110180465.6A CN201110180465A CN102855723B CN 102855723 B CN102855723 B CN 102855723B CN 201110180465 A CN201110180465 A CN 201110180465A CN 102855723 B CN102855723 B CN 102855723B
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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 motor power cable theft-prevention and cut 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 provides the motor power cable of power because its wire diameter is thick, copper content is many, along with the rising of copper valency, this part cable becomes minority lawless person's pilferage target recently.Once be cut for manufacturing machine provides the motor power cable of power, normally carrying out of enterprise's production will be had a strong impact on.Particularly some time the equipment motor cable opened of stopping time be cut, if can not find in time to take measures, when production technology needs the operation of this part equipment by the time and in time starting operation, gently causing stopping production to affect enterprises production efficiency, heavy will cause serious accident.Owing to originally not having good appropriate technology prevent and report 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 to 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 universal use.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, Installation and Debugging difficulty, particularly in multiloop connected system, use many mutual UNICOMs of warning device detection signal, be difficult to correctly distinguish which bar loop cable has occurred and cut off fault.
Prior art is also difficult to there are suitable warning means for the motor power cable situation that is cut, so current main or way of the artificial inspection of employing, artificial inspection for large-scale inspection except taking a lot of work, time-consuming and not in time, mainly that the probability just in time found while being cut of cable is extremely low, 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 motor power cable theft-prevention to cut monitoring method, this monitoring method makes no matter motor power cable is in service at cable energising motor, or cable no power motor is in out of service, as long as be cut and can send immediately alerting signal once there is motor power cable, be conducive to organize in time 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 motor power cable theft-prevention cuts monitoring method:
Under motor power cable no power motor halted state, while utilizing anti-theft monitoring device for power cable of electric motor to provide a circuit to shut down, monitoring current Ia, carries out the monitoring that whether normal circuit is;
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 monitoring that whether normal circuit is;
Under normal circumstances, motor power cable line only has two states, that is: switch on running status or power-off halted state, and described monitoring device can monitor shuts down electric current I a or running current Ic; If described monitoring device all monitors, do not shut down electric current I a or running current Ic, represent that motor power cable is cut off, described monitoring device can send alerting signal immediately;
Described 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 compared with 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, and power circuit is connected on the two-phase circuit of three-phase alternating-current supply, and its 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 electric motor control contactor, the loop current while obtaining Monitoring Line shutdown from monitored line loop;
Described running current observation circuit connects the current transformer on three-phase ac power cord road, the line current while obtaining motor operation from current transformer;
Described shutdown current monitoring circuit and running current observation circuit access described state and current ratio compared with computing circuit, state and current ratio compared with computing circuit by stopped status and current operator circuit and running status and current operator the electric circuit constitute, state and current ratio compared with computing circuit according to the current values of shutting down current monitoring circuit and running current observation circuit, the judgement of carrying out 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 compared with computing circuit, according to state and current ratio, compared with the signal of computing circuit output, sends the alerting signal that line cord is cut off by pilferage;
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 by pilferage, to be cut off state in stopped status, running status or cable respectively.
Monitoring device of the present invention, under power cable no power motor halted state, provides a path monitoring electric current I a by monitoring device, carries out the monitoring that whether normal circuit is; 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 monitoring that whether normal circuit is.As long as be cut and can send immediately alerting signal once there is motor power cable, be conducive to organize in time the relevant personnel to arrive the cable scene that is cut.If power cable line maintenance, power switch must be disconnected, and now the working power of monitoring device is cut off, and monitoring device is not worked, so monitoring device of the present invention can not repaiied and send false alarm because of breakage of circuit electric-examination.
Anti-theft monitoring device for power cable of electric motor of the present invention is without erecting equipment at the scene, as long as at cable power output end, namely, at electric indoor location monitoring device of the present invention, by the monitoring in electric panel room, just can reach the object that cable line is monitored.Monitoring device of the present invention is simple in structure, without 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.
Accompanying drawing explanation
Fig. 1 is anti-theft monitoring device for power cable of electric motor control principle schematic 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 motor operation);
Fig. 3 is anti-theft monitoring device for power cable of electric motor electrical diagram of the present invention;
Fig. 4 is monitoring device working power circuit;
Fig. 5 is for shutting down current monitoring circuit;
Fig. 6 is running current observation circuit;
Fig. 7 is that stopped status and current ratio are compared with computing circuit;
Fig. 8 is that running status and current ratio are compared with computing circuit;
Fig. 9 is alerting signal output circuit;
Figure 10 is monitoring state display circuit.
In 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 compared with computing circuit (s operation control, signal comparison operation circuit); 41 stopped statuss and current ratio are compared with computing circuit; 42 running statuses and current ratio be compared with computing circuit, 5 alerting signal output circuits (output of reporting to the police), 6 monitoring state display circuits.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
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 compared with 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, described link position a, 2 of 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 is mainly 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 after power transformer BT, transistor fairing ZL1, filter capacitor C1, C2 and three-terminal voltage-stabilizing pipe VW1, offer 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 electric motor control contactor, the loop current while obtaining Monitoring Line shutdown from monitored line loop; Described shutdown current monitoring circuit 2 is mainly 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 after current-limiting resistance R2, through transistor fairing, ZL2 is transformed to direct current, triggers photocoupler GL1 after RC filtering again, makes photocoupler GL1 conducting, output low level to stopped status and current ratio compared with computing circuit 41; Referring to Fig. 5.
The Current Transmit that described running current observation circuit 3 connects on three-phase ac power cord road, the line current while obtaining motor operation from Current Transmit; Described running current observation circuit 3 is mainly comprised of internal current mutual inductor CT, transistor fairing ZL3 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 ZL3, then after RC filtering C4, R5 filtering, export high level to running status and current ratio compared with 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 compared with computing circuit 4, state and current ratio compared with computing circuit 4 according to the current values of shutting down current monitoring circuit 2 and running current observation circuit 3, the judgement of carrying out circuit running status and having or not line cord to be cut off by pilferage; Described state and current ratio are mainly comprised of stopped status and current operator circuit 41 and running status and current operator circuit 42 compared with 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 signal respectively by two operational amplifier F1, F2 by shutting down current monitoring circuit 2 inputs, output in the same way; Input low level, output low level.When cable line is normal, from shutting down current monitoring circuit 2 input low levels, this circuit output low level is to monitoring state display circuit 6, alerting signal output circuit 5; Referring to Fig. 7.
Described running status and current operator circuit 42 are mainly 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 is normal, from running current observation circuit 3 input high levels, this circuit output low level is 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 compared with computing circuit 4, according to state and current ratio, compared with the signal of computing circuit 4 outputs, sends the alerting signal that line cord is cut off by pilferage; Described alerting signal output circuit 5 is mainly 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, alerting signal power stage, alarm condition signal outputs to monitoring state display circuit 6.State and current ratio are compared with 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 is normal, from state and current ratio, compared with computing circuit 4 input low levels, relay J discharges, and output signal is to monitoring state display circuit 6 output high level, and the disconnected cable status lamp of emitting led pilot lamp LD3 in monitoring state display circuit 6 extinguishes; 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 by pilferage, to be cut off state in stopped status, running status or cable 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, 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.
Motor power cable theft-prevention cuts a monitoring method, implements, referring to Fig. 1, Fig. 2, Fig. 3 on aforementioned anti-theft monitoring device for power cable of electric motor basis.
Under motor power cable no power motor halted state, while utilizing described monitoring device to provide a circuit to shut down, monitoring current Ia, carries out the monitoring that whether normal circuit is;
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 monitoring that whether normal circuit is;
Under normal circumstances, motor power cable line only has two states, that is: switch on running status or power-off halted state, and described monitoring device can monitor shuts down electric current I a or running current Ic; If described monitoring device all monitors, do not shut down electric current I a or running current Ic, represent that 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 all the time in closure state 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 monitoring state; Described link position a, 2 of 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.
Now, because motor is not worked, in out of service, the contactor contact of three-phase supply circuit is in off-state, and power cable service interruption is electric.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 power circuit 1), current limliting flows out to contact c point under described contactor, enter cold power cable circuit, monitoring current Ia flow into one 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 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, from d point, flow into the shutdown current monitoring circuit 2 of described monitoring device, after treatment circuit in stop over machine current monitoring 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 again this phase contact upper contact b point and form shutdown current monitoring loop,
Now described monitoring device shutdown current monitoring circuit 2 continues to have a small monitoring current Ia to pass through, shut down current monitoring circuit 2 this small monitoring current signal is sent into state and current ratio compared with computing circuit 4, state and current ratio compare computing compared with computing circuit 4 by the signal amplitude receiving and motor shutdown reference value, 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 orderly closedown state.
If 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 and shut down the signal output that current monitoring circuit 2 is greater than specified reference value signal amplitude compared with computing circuit 4, running current observation circuit 3 is not greater than the signal output of specified reference value signal amplitude yet simultaneously, state and current ratio obtain compared with computing circuit 4 judgement that cable line is cut off, state and current ratio are exported to alerting signal output circuit 5 compared with computing circuit 4 by judged result, alerting signal is sent in the output relay adhesive that makes to report to the police, and monitoring state display circuit 6 shows the state that cable is cut off.
2, at power cable, switch on motor in running status, the power switch of three-phase supply circuit is all the time in closure state, 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 monitoring state; Described link position a, 2 of 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.
Now contactor contact is 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, shutdown current monitoring circuit 2 monitorings of monitoring device are less than electric current.Now motor running current Ib flows through from three-phase supply circuit, after being installed in the current transformer induction on circuit, obtain the running current observation circuit 3 that secondary running current Ic is sent to described monitoring device, running current observation circuit 3 is sent into state and current ratio compared with computing circuit 4 by this current signal, state and current ratio compare computing compared with computing circuit 4 by the signal amplitude receiving and motor operation reference value, 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 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 compared with computing circuit 4 the signal output that running current observation circuit 3 is greater than specified reference value signal amplitude, shut down current monitoring circuit 2 simultaneously and be not also greater than the signal output of specified reference value signal amplitude, state and current ratio obtain compared with computing circuit 4 judgement that cable line is cut off, state and current ratio are exported to alerting signal output circuit 5 compared with computing circuit 4 by judged result, alerting signal is sent in the output relay adhesive that makes to report to the police, and monitoring state display circuit 6 shows the state that cable is cut off.
3, power cable line maintenance, the power switch of three-phase alternating current is disconnected, described monitoring device is lost the job power supply in off position, the warning output of monitoring device can not moved output alarm signal because of the power supply of losing the job yet, so yet can not repair and send false alarm signal because of breakage of circuit electric-examination.
These are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention, therefore, all any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. motor power cable theft-prevention cuts a monitoring method, it is characterized in that:
Under motor power cable no power motor halted state, while utilizing anti-theft monitoring device for power cable of electric motor to provide a circuit to shut down, monitoring current Ia, carries out the monitoring that whether normal circuit is;
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 monitoring that whether normal circuit is;
Under normal circumstances, motor power cable line only has two states, that is: switch on running status or power-off halted state, and described monitoring device can monitor shuts down electric current I a or running current Ic; If described monitoring device all monitors, do not shut down electric current I a or running current Ic, represent that motor power cable is cut off, described monitoring device can send alerting signal immediately;
Described 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 compared with 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, and power circuit is connected on the two-phase circuit of three-phase alternating-current supply, and its 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 electric motor control contactor, the loop current while obtaining Monitoring Line shutdown from monitored line loop;
Described running current observation circuit connects the current transformer on three-phase ac power cord road, the line current while obtaining motor operation from current transformer;
Described shutdown current monitoring circuit and running current observation circuit access described state and current ratio compared with computing circuit, state and current ratio compared with computing circuit by stopped status and current operator circuit and running status and current operator the electric circuit constitute, state and current ratio compared with computing circuit according to the current values of shutting down current monitoring circuit and running current observation circuit, the judgement of carrying out 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 compared with computing circuit, according to state and current ratio, compared with the signal of computing circuit output, sends the alerting signal that line cord is cut off by pilferage;
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 by pilferage, to be cut off state in stopped status, running status or cable respectively.
2. motor power cable theft-prevention according to claim 1 cuts monitoring method: it is characterized in that:
Under motor power cable no power motor halted state, three-phase power switch is all the time in closure state 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, described link position a, 2 of b are positioned at the power switch bottom of three-phase alternating-current supply, the top of electric motor control contactor;
Now the contactor contact of three-phase supply circuit is 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 described contactor, enter cold power cable circuit, monitoring current Ia flow into one end of motor winding line through a heart yearn of power cable, by flow out to another root heart yearn of power cable after motor winding line from the other end, monitoring current Ia this root heart yearn of flowing through turns back to contact d point under the contactor of this heart yearn, from d point, flow into the shutdown current monitoring circuit of described monitoring device, after treatment circuit in stop over machine current monitoring circuit and current limliting are processed, monitoring current Ia flows out to the other end of power circuit from shutting down current monitoring circuit, the contactor upper contact b point that flows out to again this heart yearn forms shuts down current monitoring loop,
Now described monitoring device shutdown current monitoring circuit continues to have a small monitoring current Ia to pass through, shut down current monitoring circuit this small monitoring current signal is sent into state and current ratio compared with computing circuit, through state and current ratio, compared with computing circuit computing comparison, obtain cable line and judge normally;
If 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; through state and current ratio compared with computing circuit computing comparison; obtain the judgement that cable line is cut off; connection status and current ratio are compared with the alerting signal output circuit output alarm signal of computing circuit, and alerting signal is sent in the output relay adhesive that makes to report to the police.
3. motor power cable theft-prevention according to claim 1 cuts monitoring method: it is characterized in that:
At power cable, switch on motor in running status, the power switch of three-phase supply circuit is all the time in closure state, 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, described link position a, 2 of b are positioned at the power switch bottom of three-phase alternating-current supply, the top of electric motor control contactor;
Now contactor contact is 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 three-phase supply circuit, after being installed in the current transformer induction on circuit, obtain the running current observation circuit that secondary running current Ic is sent to described monitoring device, running current observation circuit is sent into state and current ratio compared with computing circuit by this current signal, through state and current ratio, compared with computing circuit computing comparison, obtain cable line and judge normally;
If 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, through state and current ratio compared with computing circuit computing comparison, obtain the judgement that cable line is cut off, connection status and current ratio are compared with the alerting signal output circuit output alarm signal of computing circuit, and alerting signal is sent in the output relay adhesive that makes to report to the police.
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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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| 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 |
| FR3093814B1 (en) | 2019-03-11 | 2021-02-26 | Crouzet Automatismes | ELECTRICAL INSTALLATION INCLUDING A MONITORING MODULE |
| FR3093815B1 (en) | 2019-03-11 | 2021-02-26 | Crouzet Automatismes | ELECTRICAL INSTALLATION INCLUDING A MONITORING MODULE |
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| JP特开2003-270274A 2003.09.25 |
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