CN2867316Y

CN2867316Y - Electric cable safety monitoring device

Info

Publication number: CN2867316Y
Application number: CN200520023018.XU
Authority: CN
Inventors: 疏学明; 袁宏永; 申世飞; 苏国锋; 梁光华; 吴健宏; 孙占辉
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2005-06-10
Filing date: 2005-06-10
Publication date: 2007-02-07
Anticipated expiration: 2015-06-10

Abstract

A cable safety monitoring device belongs to the technical field of monitoring of safe operation of cables. It comprises temperature measuring element, data transmission line, data collection circuit assembly, data conversion circuit and computer, which are in series connection. Typically, the cable overheat has is characterized by in high invisibility, slow temperature rise in early stage, and difficult detection using the existing method. The utility model is proposed against the above is characterized by, and realizes the real-time monitoring of cable operation with advantages of high measurement accuracy, fast storage, good anti-jamming performance and access to network communication. It is suitable for the monitoring of safe operation of high-voltage cable and low-voltage electrical equipment.

Description

A kind of cable security supervising device

Technical field:

The utility model belongs to the cable running safety monitoring technical field, is specifically related to the cable running safety monitoring device.

Background technology:

High-tension cable uses in modern industry enterprise frequently, has brought into play huge effect in industrial and agricultural production, but the thing followed is the occurrence probability cumulative year after year of cable fault.In case cable generation security incident, the lighter has a power failure, stop production to overhaul, and weight person will cause serious fire failure, and consequence is very serious, and repair is also extremely difficult, and its economic loss that causes can not be underestimated.Add up according to interrelated data, all kinds of power plant of China take place surplus the hot security incident 140 of cable over nearly 20 years, wherein reach unexpectedly in the period of the 1986-1992 7 75 times, there are 24 power plant that the above cable fire accident of secondary took place, indivedual power plant reach 4-6 time, wherein the loss that cable fire caused more than 70% is very serious, and 40% fire failure causes especially big loss.Carry out the cable security Study on Monitoring Technology,, avoid the generation of fire and explosion accident, have very significant meaning early detection cable fault hidden danger.

That the main inner reason of cable fault is that power cable joint is made is bad, crimping is tight, contact resistance is excessive and long-time running causes the overheated insulated envelope of burning of cable splice core conductor, further causes cable short circuit and causes fire.The external cause of cable fault is to cause outside wall temperature sharply to increase and initiation fire because outside high-power thermal source conducts heat.No matter be inner reason or external cause, thermal losses is too high to be the most basic factor that causes the hot security incident of cable.

At cable surface temperature anomaly is these characteristics of external sign of its hot stall, has had a lot of temp measuring methods to apply in the cable security supervisory system at present.Temperature-sensing element commonly used mainly contains infrared sensor, thermopair, thermistor, semiconductor PN, temperature control thyristor and integrated circuit type temperature sensor etc.The infrared sensor biggest advantage is a non-cpntact measurement, thereby has good security, and its shortcoming is complex structure, poor anti jamming capability, to the environmental requirement height; The thermopair transmission signals need be used special-purpose compensating line, and transmission range is unsuitable oversize, is not suitable for the cable temperature monitoring; Thermistor is generally platinum resistance, generally needs to adopt the three-wire type transmission, the output of balanced bridge formula, and transmission range is also unsuitable oversize, and anti-jamming capacity is relatively poor; Semiconductor PN type and temperature control thyristor-type sensor all are not suitable for the monitoring of cable temperature yet.

Therefore, be applied in the measurement of cable outside wall temperature the characteristics that disguise is high because the cable superheating phenomenon has, temperature rise in early age is slow, be difficult to detect although have multiple temp measuring method at present.Under normal conditions, be superheated to accident from cable end and take place, whole process slower development, overlong time, the temperature rise in early age phenomenon is not obvious, and current measuring methods is difficult to monitor effectively.

The utility model has adopted advanced temperature-sensitive sensor and bussing technique, developed a kind of cable surface temperature monitoring system of total digitalization, laying is convenient, maintenance is simple, with low cost, antijamming capability is strong, solve the deficiencies in the prior art part preferably, adopted cable meter temperature supervising device to monitor the cable operation conditions in real time.

Summary of the invention:

The utility model provides a kind of cable running safety monitoring device, realizes the real-time monitoring to cable running safety, guarantees the high-tension cable safe operation.

The utility model comprises temperature element 1, data line 2, data acquisition circuit assembly 3, data converting circuit 4, computing machine 5 and cable 10.

The utility model cable security supervising device is characterized in that it contains:

Temperature element 1, described temperature element are the semiconductor temperature-sensing probes, are encapsulated in the metal shell by heat-conducting glue, adopt Plastic Bandage described metal shell to be fixed on the outer wall of cable 10;

Data line 2, described data line are three core armouring signal wires, and its ground wire, data line and power lead link to each other with three pin of described temperature element respectively;

Data acquisition circuit assembly 3, described data acquisition circuit assembly contains micro-processor interface circuit 6, data acquisition circuit 7, communicating circuit 8 and power circuit 9, wherein:

Micro-processor interface circuit 6 contains:

Microprocessor is made of chip AVRMEGA16-16PI;

REST, DATA, CLK, WP waveshaping circuit are made of chip 24C021, and the REST of described waveshaping circuit, DATA, CLK, WP signal output part link to each other with the respective input of described microprocessor respectively;

COMM, EEPROM, ON/OFF, ERR, POWER indicator light circuit constitute by bleeder circuit with corresponding LED that it is just being gone here and there, the COMM of described indicator light circuit, EEPROM, ON/OFF, ERR, POWER signal output part, the negative pole of promptly corresponding each pilot lamp LED links to each other with the respective input of described microprocessor;

Data acquisition circuit 7 is bus types, contains:

Transistor control circuit, the acquisition controlling signal of described control circuit are that the grid of each triode links to each other with the corresponding control signal output terminal of described microprocessor;

Acquisition Circuit, it is made of the clamping diode circuit that links to each other with a bus, electric resistance partial pressure type signal acquisition circuit, and the signal output part of described two circuit all links to each other with the acquired signal input end of described microprocessor by described bus;

Communicating circuit 8 contains:

TX promptly sends waveshaping circuit, RX is that received signal forms circuit and OE promptly allows to send waveshaping circuit, they all are made of chip 6N136 respectively, and its TX input end, RX input end, OE output end signal port link to each other with described microprocessor respective input respectively;

The formation control circuit of TX, RX, each signal of OE is made of chip piece MAX485, and each control signal output ends of this MAX485 chip links to each other with the signal input end of described TX, RX, OE formation circuit respectively;

Power circuit 9 contains:

Self powered supply is made of battery and the chip DY05S05 in parallel with this battery, and the output terminal of described chip is the 5V direct supply;

External power supply, the input end of described external power supply links to each other with chip XZER05/24S05 input end through behind the resettable fuse, and described chip is output as the 5V direct supply;

Data converting circuit 4, described data converting circuit link to each other with computing machine 5 after the RS485 conversion of signals of remote transmission is become the RS232 signal; In the described data converting circuit, each terminal of plug-in card J52 respectively with communicating circuit in each terminal of output terminal plug-in card J9 dock one by one; U52 becomes the Transistor-Transistor Logic level signal with the RS485 conversion of signals, delivers to U55 after U53, U54 isolate, and U55 is converted to Transistor-Transistor Logic level the RS232 interface of delivering to computing machine 5 behind the RS232 signal by J53.

Compare with existing cable security supervising device, the utlity model has following major advantage:

1). temperature-sensing probe is highly sensitive, and temperature measurement accuracy can reach ± and 0.5 ℃;

2). picking rate is fast, and temperature data and digital signal transformation time are not more than 15ms;

3). anti-electromagnetic interference capability is strong, anticorrosive property good, and is working properly under the strong-electromagnetic field environment;

4). the network enabled function, power system capacity is big, long transmission distance.Each data acquisition module can connect 8 circuit-switched data transmission lines, can be connected in series 64 probes on every single data transmission line;

5). system possesses the self check ability that reports an error, stable performance;

6). by the data line power supply, wiring is simple, cost is low, stable, it is simple to safeguard;

7). each temperature-sensing probe has the unique coding of 64bit, according to the corresponding relation of temperature-sensing probe position and its Digital ID sign indicating number, can determine the position of temperature anomaly point exactly, has solved the difficult problem of cable hidden danger location.

The utility model is suitable for the security monitoring of high-tension cable and low voltage electrical equipment circuit, and is safe and convenient to use, can greatly improve the automatization level of cable security monitoring.

Description of drawings:

Fig. 1 the utility model systematic schematic diagram;

Fig. 2 micro-processor interface circuit schematic diagram;

Fig. 3 data acquisition circuit schematic diagram;

Fig. 4 communicating circuit schematic diagram;

Fig. 5 power circuit principle figure;

Fig. 6 (a) data converting circuit schematic diagram;

The power circuit principle figure of Fig. 6 (b) data converting circuit;

Embodiment:

Specify embodiment of the present utility model below in conjunction with accompanying drawing.

Embodiment 1:

Monitoring of the utility model cable security and postitallation evaluation method and device thereof are made up of temperature element 1, data line 2, data acquisition circuit assembly 3, data converting circuit 4, computing machine 5 and cable 10.

Temperature element 1 is meant 18B20 N-type semiconductor N temperature-sensing probe in the present embodiment, be encapsulated in the metal shell by heat-conducting glue, adopt Plastic Bandage that metal shell is fixed on the cable outer wall, three pin of temperature-sensing probe are connected with ground wire, data line and the power lead of data line 2 respectively, described data line 2 is made up of triple core wire, and the electric wire outer wall wraps up aluminium foil, copper mesh, inner restrictive coating, steel armour and external sheath layer respectively.

Data acquisition circuit assembly 3 in the present embodiment is made up of micro-processor interface circuit 6, data acquisition circuit 7, communicating circuit 8, power circuit 9.

Described micro-processor interface circuit 6 is used for data acquisition, system state shows, is made up of integrated circuit U1～U2, exclusion PR1～PR2, diode L1～L5, capacitor C 1～C3, resistance R 1～R22, crystal oscillator Y1.Wherein, 1 pin of U1,2 pin, 3 pin, 9 pin respectively with 6 pin of U2,5 pin, 3 pin, 7 pin correspondence one by one join, 4 pin of U1,5 pin, 6 pin, 7 pin, 8 pin respectively and L1, L2, L3, the negative electrode of L4 and L5 correspondence one by one joins, 10 pin of U1,11 pin respectively with the VCC of power supply, GND correspondence one by one joins, the end of C1, the end of Y1 and 12 pin of U1 join, the end of C2,13 pin of the other end of Y1 and U1 join, the other end of C1, the other end and the GND of C2 join, 14 pin of U1,15 pin, 16 pin respectively with communicating circuit 8 in R32, R33, the end of R31 correspondence one by one joins, 30 pin of U1,31 pin respectively with the VCC of power supply, GND correspondence one by one joins, 32 pin of U1 and the end of C3 join, the other end and the GND of C3 join, 22 pin of U1,23 pin, 24 pin, 25 pin, 26 pin, 27 pin, 28 pin, 29 pin, 33 pin, 34 pin, 35 pin, 36 pin, 37 pin, 38 pin, 39 pin, 40 pin respectively and R5, R7, R9, R11, R13, R15, R17, R19, R18, R16, R14, R12, R10, R8, R6, the end of R4 correspondence one by one joins, R5, R7, R9, R11, R13, R15, R17, the other end of R19 respectively with 9 pin of PR2,8 pin, 7 pin, 6 pin, 5 pin, 4 pin, 3 pin, 2 pin correspondence one by one join, 1 pin and the GND of PR2 join, R4, R6, R8, R10, R12, R14, R16, the other end of R18 respectively with data acquisition circuit 7 in 1 pin of J1,1 pin of J2,1 pin of J3,1 pin of J4,1 pin of J5,1 pin of J6,1 pin of J7,1 pin of J8 correspondence one by one joins, 2 pin of U2 and the end of R21 join, the other end and the GND of R21 join, 4 pin and the GND of U2 join, 8 pin and the VCC of U2 join, R1, R2, the end of R3 respectively with 5 pin of U2,6 pin, 7 pin correspondence one by one join, R1, R2, the other end and the VCC of R3 join, L2, L3, L4, the anode of L5 respectively with 2 pin of PR1,3 pin, 4 pin, 5 pin correspondence one by one join, 1 pin and the VCC of PR1 join, the end of the anode of L1 and R22 joins, and the other end and the VCC of R22 join.

Described data acquisition circuit 7 is made up of connection terminal J1～J8, exclusion PR3, diode D1～D16, triode Q1～Q8, capacitor C 5～C12, resistance R 23～R30.Wherein, the end of 9 pin of 1 pin of the negative electrode of the anode of D1, D2, J1, PR3, R23 joins.The end of 1 pin of the anode of D3, the negative electrode of D4, J2,8 pin of PR3, R24 joins.The end of 1 pin of the anode of D5, the negative electrode of D6, J3,7 pin of PR3, R25 joins.The end of 1 pin of the anode of D7, the negative electrode of D8, J4,6 pin of PR3, R26 joins.The end of 1 pin of the anode of D9, the negative electrode of D10, J5,5 pin of PR3, R27 joins.The end of 1 pin of the anode of D11, the negative electrode of D12, J6,4 pin of PR3, R28 joins.The end of 1 pin of the anode of D13, the negative electrode of D14, J7,3 pin of PR3, R29 joins.The end of 1 pin of the anode of D15, the negative electrode of D16, J8,2 pin of PR3, R30 joins.1 pin and the VCC of PR3 join, and negative electrode and the VCC of D1, D3, D5, D7, D9, D11, D13, D15 join.D2, D4, D6, D8, D10, D12, D14, anode and the GND of D16 join, J1, J2, J3, J4, J5, J6, J7,2 pin and the GND of J8 join, J1, J2, J3, J4, J5, J6, J7,3 pin and the VCC of J8 join, J1, J2, J3, J4, J5, J6, J7,4 pin and the earth E of J8 join, Q1, Q2, Q3, Q4, Q5, Q6, Q7, the grid of Q8 respectively and C5, C6, C7, C8, C9,10, C11, the end of C12 is corresponding one by one join after more respectively with micro-processor interface circuit 6 in 9 pin of PR2,8 pin, 7 pin, 6 pin, 5 pin, 4 pin, 3 pin, 2 pin correspondence one by one join, C5, C6, C7, C8, C9,10, C11, the other end of C12 respectively and R23, R24, R25, R26, R27, R28, R29, the other end of R30 after correspondence is joined one by one more respectively and Q1, Q2, Q3, Q4, Q5, Q6, Q7, the drain electrode of Q8 correspondence is one by one joined, Q1, Q2, Q3, Q4, Q5, Q6, Q7, source electrode and the GND of Q8 join.

Described communicating circuit 8 is made up of connection terminal J9, integrated circuit U3～U6, triode Q9, resistance R 31～R38, resettable fuse F1～F2.Wherein, U3, U4,3 pin of U5 respectively and R31, R35, the end of R33 correspondence one by one joins, 2 pin of U3,8 pin of U4,2 pin of U5, the other end and the VCC of R32 join, 8 pin of U3,2 pin of U4,8 pin of U5, the end of R34, the end of R36, the emitter-base bandgap grading of Q9,8 pin and the 5V of U6 join, U3,6 pin of U4 respectively and R37, the other end of R32 correspondence one by one joins, 6 pin of U5, the other end of R34,4 pin of U6 join, 5 pin of U3,5 pin of U5, the end of R38,5 pin of U6,5 pin and the 0V of J9 join, 5 pin and the GND of U4 join, the other end of R36, the other end of R37 and the base stage of Q9 are joined, the other end of R38, the collector of Q9,2 pin of U6,3 pin of U6 join, the other end of R35,1 pin of U6 joins, 6 pin of U6,7 pin respectively with the end of F1, the end of F2 correspondence one by one joins, the other end of F2,1 pin of J9,3 pin of J9 join, the other end of F1,2 pin of J9,4 pin of J9 join.

Described power circuit 9 is made up of connection terminal J10, integrated circuit U7～U8, resettable fuse F3, electric capacity E1～E4, capacitor C 16～C22.Wherein, 1 pin of J10 and the end of F3 join, 2 pin of J10, the end of C19, the end of C20, the negative pole of E3,2 pin of U8 join, 3 pin of J10, the other end of C19, the end of C18 and the end of C22 and the earth E join, the other end of F3, the other end of C20, the positive pole of E3,1 pin of U8 joins, the end of C21, the positive pole of E4,3 pin of U8, the positive pole of E1, the end of C16,14 pin and the VCC of U7 join, the other end of C21, the negative pole of E4,5 pin of U8, the other end of C22, the negative pole of E1, the other end of C16,1 pin and the GND of U7 join, the end of C17, the positive pole of E2,8 pin and the 5V of U7 join, the other end of C17, the negative pole of E2,9 pin of U7, the other end and the 0V of C18 join.

Described data converting circuit 4 is made up of connection terminal J51～J53, integrated circuit U51～U56, resistance R 51～R54, resettable fuse F51～F52, electric capacity E51～E52, capacitor C 51～C58.Wherein, 1 pin of J51, the positive pole of E51, the end of C51,14 pin and the VCC of U51 join, 2 pin of J51, the negative pole of E51, the other end of C51,1 pin and the GND of U51 join, 8 pin of U51, the end of C52, positive pole and the 5V of E52 join, 9 pin of U51, the other end of C52, negative pole and the 0V of E52 join, 1 pin of J52, the end of 3 pin and F52 joins, 2 pin of J52, the end of 3 pin and F51 joins, 6 pin of U52 and the other end of F1 join, 7 pin of U52 and the other end of F52 join, 5 pin of U52,5 pin and the GND of J52 join, 8 pin and the VCC of U52 join, 1 pin of U52 and the end of R53 join, 2 pin of U52,3 pin of 3 pin and U56 join, 4 pin of U52,1 pin of U56,6 pin of U54 and the end of R52 join, 3 pin of the other end of R53 and U53 join, 7 pin of U54,8 pin of U54,2 pin of U53, the end of C53, the other end and the VCC of R52 join, the other end and the GND of C53 join, 2 pin of U54,7 pin of U53,8 pin of U53, the end of C54, an end and the 5V of R54 join, 5 pin of U53, the other end and the 0V of C54 join, 6 pin of U53,11 pin of the other end of R54 and U55 join, 3 pin of U54 and the end of R51 join, 12 pin of the other end of R51 and U55 join, 1 pin of U55,3 pin join with the two ends of C58 respectively, 4 pin of U55,5 pin join with the two ends of C57 respectively, 2 pin of U55,6 pin respectively with the end of C55, the end of C56 correspondence one by one joins, the other end of C55, the other end of C56,5 pin and the 0V of J53 join, 13 pin of U55,14 pin respectively with 2 pin of J53,3 pin correspondence one by one join.

Claims

1. cable security supervising device is characterized in that it contains:

Temperature element (1), described temperature element are the semiconductor temperature-sensing probes, are encapsulated in the metal shell by heat-conducting glue, adopt Plastic Bandage described metal shell to be fixed on the outer wall of cable (10);

Data line (2), described data line are three core armouring signal wires, and its ground wire, data line and power lead link to each other with three pin of described temperature element respectively;

Data acquisition circuit assembly (3), described data acquisition circuit assembly contain micro-processor interface circuit (6), data acquisition circuit (7), communicating circuit (8) and power circuit (9), wherein:

Micro-processor interface circuit (6) contains:

Microprocessor is made of chip AVRMEGA16-16PI;

Data acquisition circuit (7) is a bus type, contains:

Communicating circuit (8) contains:

Power circuit (9) contains:

Data converting circuit (4), described data converting circuit links to each other with computing machine (5) after the RS485 conversion of signals of remote transmission is become the RS232 signal, in the described data converting circuit, each terminal of plug-in card J52 respectively with communicating circuit in each terminal of output terminal plug-in card J9 dock one by one, U52 becomes the Transistor-Transistor Logic level signal with the RS485 conversion of signals, deliver to U55 after U53, U54 isolate, U55 is converted to Transistor-Transistor Logic level the RS232 interface of delivering to computing machine 5 behind the RS232 signal by J53.