CN209561075U - A kind of weak electric signal transmission line for dry-type reactor interturn insulation detection - Google Patents
A kind of weak electric signal transmission line for dry-type reactor interturn insulation detection Download PDFInfo
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- CN209561075U CN209561075U CN201920247531.9U CN201920247531U CN209561075U CN 209561075 U CN209561075 U CN 209561075U CN 201920247531 U CN201920247531 U CN 201920247531U CN 209561075 U CN209561075 U CN 209561075U
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Abstract
The utility model provides a kind of weak electric signal transmission line for dry-type reactor interturn insulation detection, including transmission line load body, the outer surface of transmission line load body is wound with conducting wire, conducting wire is repeated cyclically coiling using positive coiling and oppositely wound alternating, continuous mode on the surface of transmission line load body, and the transmission line outer surface after coiling is packaged with insulation encapsulated layer.The transmission line makes the induced voltage of forceful electric power magnetic environment be greatly lowered and be cancelled out each other, the electromagnetic interference noise of environment, which will not be constituted the weak electric signal of thermistor wire, temperature-sensitive thermocouple wire, to be influenced, the inductance characteristic of this type solenoid type structure can effectively filter out exchange, high-frequency signal interference simultaneously, further fundamentally guarantee the precision and stability of the signal transmission of this transmission line.It is suitable for power grid under complex electromagnetic environment, reliability requirement is high, electric system on-line monitoring low frequency (or direct current), weak electric signal transmission field.
Description
Technical field
The utility model relates to a kind of signal transmssion lines, exhausted for dry reactor turn-to-turn more particularly to one kind
The weak electric signal transmission line of edge detection.
Background technique
Due to the construction of large capacity power grid, the dry reactor of 35kV grades or more electric system is generally run outdoors,
Operating condition is severe, in the environment in strong electromagnetic.In order to guarantee the reliability service of equipment, a large amount of use reflects turn-to-turn insulation
The on-line checking of the parameter (such as: temperature, voltage, electric current, phase) of operating status monitors in real time.
By taking temperature detecting sensor as an example, thermal resistance, electric thermo-couple temperature sensing thermometry (patent No. CN105587679A,
CN201464067U), using thermal resistance, thermocouple characteristic, the resistance in circuit, the temperature of voltage change characterization position are generated
Value and its variation.Near 100 DEG C of temperature, the resistance change rate of thermistor be about~35 Ω/DEG C, the resistance variations of pt100
Rate be about 0.38 Ω/DEG C, and potential (voltage) variation range of temperature-sensitive galvanic couple about~0.04mV/ DEG C.With the dry-type hollow of 35kV
For reactor, the induced voltage actual measurement at transmission line port is about 0.3~3V.As a result, in high voltage, forceful electric power magnetic environment
Under, sensor generate faint electric signal in transmission process inevitably by strong interference and influence, to lead
Its signal detection precision and reliability is caused not to can guarantee.
Therefore, how to improve the anti-electromagnetic interference capability of signal transmitting apparatus is to realize grid operation state key skill
Art.There are two main classes for currently used method: 1, shielded cable: covering electromagnetic interference using outer layer metal tube or screen, still
Since the eddy-current heating of itself brings high temperature and failure of insulation, it is made not to be suitable for forceful electric power magnetic environment;2, twisted pair: difference is utilized
Common mode interference signal is eliminated, but the induced voltage of the common mode under forceful electric power magnetic environment sharply increases, and easily discharges, destroys signal
The electrical isolation of reception device influences the reliability of signal transmission.
Summary of the invention
In order to solve the problems, such as above-mentioned technology, the utility model provides a kind of exhausted for dry reactor turn-to-turn
The weak electric signal transmission line of edge detection.
The utility model is achieved through the following technical solutions: a kind of for the weak of dry-type reactor interturn insulation detection
Electrical signal transmission line, including transmission line load body, the outer surface of the transmission line load body are wound with conducting wire, and the conducting wire is passing
The surface of defeated line load body is repeated cyclically coiling, positive coiling using positive coiling and oppositely wound alternating, continuous mode
It is identical with oppositely wound the number of turns, circle density is identical, positive one coiling list of coiling section and an oppositely wound section of composition
Member, the transmission line outer surface after coiling are packaged with insulation encapsulated layer.
In above scheme, the transmission line load body is flexible insulation core wire, and the material of flexible insulation core wire can be PVC
Wire rod, nylon wire rod, polytetrafluoroethylene (PTFE) wire rod, glass fiber bundle wire rod or tubing.
In above scheme, the conducting wire is used with insulating layer, non-magnetic two-wire or multi-thread, the two-wire or it is multi-thread can
To be twisted wire, it is also possible to parallel wires.
In above scheme, the material of the conducting wire is copper or aluminium, and the diameter of conducting wire is 0.1mm~2mm.
In above scheme, the circle density of the conducting wire coiling is 2~100 circles/cm.
In above scheme, the total number of turns of the coiling unit is 2~100 circles.
In above scheme, the flexible insulation core line diameter is 0.5~15mm.
In above scheme, the insulation encapsulated layer material is heat-shrink tube, PVC, nylon, glass fiber bundle, polytetrafluoroethylene (PTFE)
Equal insulating sleeves, the wall thickness of insulating sleeve are 0.01~2mm.
A kind of weak electric signal transmission line and prior art phase for dry-type reactor interturn insulation detection of the utility model
Than, the beneficial effect is that:
1 using etc. the number of turns (close the number of turns) just around, back-roll the coiling of structural unit periodicity, transmit wire body under electromagnetic environment
The induced voltage of generation is cancelled out each other, and realizes the self compensation effect of 0 induced voltage;
2, using Double-wire parallel wound or twisted wire and around autodyne form-separating is formed, eliminate external electromagnetic interference;
3 use the coiling of solenoid mode, filter out exchange, high-frequency signal using the inductance characteristic of itself.So as to by realizing
The reliable and stable transmission of low frequency or direct current class weak electric signal.
4 the utility model are compared with conventional shielding cable architecture, without eddy current effect, suitable for weak under forceful electric power magnetic environment
Electric signal transmission.
5 the utility model are compared with conventional twisted pair construction, no electromagnetic induction voltage, more to signal back-end processing device
Safety, while there is good shielding filtration result to exchange, high-frequency signal.
Detailed description of the invention
Fig. 1 is structural representation of the utility model for the weak electric signal transmission line of dry-type reactor interturn insulation detection
Figure.
Fig. 2 is transmission line for the electromagnetism interference experimental data that airway temperature measures between dry-type air-core reactor encapsulating
Figure.
Fig. 3 is the electromagnetism interference experimental data figure that transmission line is used for the measurement of reactor with T-shaped core iron on the yoke temperature.
In figure: 1. insulation encapsulated layers, 2. transmission line load bodies, 3. positive coiling conducting wires, 4. oppositely wound conducting wires, 5. is positive
Coiling section, 6. oppositely wound sections.
Specific embodiment
It is used for the light current of dry-type reactor interturn insulation detection to the utility model with specific embodiment with reference to the accompanying drawing
Signal transmssion line is further described:
Fig. 1 is structural representation of the utility model for the weak electric signal transmission line of dry-type reactor interturn insulation detection
Figure.In figure, this is used for the weak electric signal transmission line of dry-type reactor interturn insulation detection, including transmission line load body 2, the biography
The outer surface of defeated line load body 2 is wound with positive coiling conducting wire 3 and oppositely wound conducting wire 4, table of the conducting wire in transmission line load body
Face is repeated cyclically coiling using positive coiling and oppositely wound alternating, continuous mode, positive coiling section 5 and oppositely wound section
6 the number of turns is identical, circle density is identical, a positive coiling section 5 and one oppositely wound section 6 composition, one coiling unit, around
Transmission line outer surface after system is packaged with insulation encapsulated layer 1.Transmission line load body 2 is flexible insulation core wire, flexible insulation core wire
Material can be PVC wire rod, nylon wire rod, polytetrafluoroethylene (PTFE) wire rod, glass fiber bundle wire rod or tubing.Positive coiling conducting wire
3 and oppositely wound conducting wire 4 using with insulating layer, non-magnetic two-wire or multi-thread, two-wire or it is multi-thread can be twisted wire, can also be with
It is parallel wires.
In Fig. 1, the conducting wire of transmission line uses with insulating layer, non-magnetic 2 parallel wires or twisted wire, the material of conducting wire
Matter enamel covered wire or insulating film coat aluminum conductor, line footpath Φ 0.1mm~2mm of solid conductor.Using solenoid structure, along exhausted
Edge core wire by identical circle density, according to etc. the number of turns principle, just around section and back-roll Duan Weiyi coiling unit in a manner of carry out
Coiling.Circle density is 2~100 circles/cm, and positive coiling section 5 and oppositely wound section 6 the number of turns select 2~100 circles.Insulation encapsulating
The biography that layer 1 finishes coiling using insulating sleeves such as heat-shrink tube, PVC, nylon, glass fiber bundle, the polytetrafluoroethylene (PTFE) of commercialization
Defeated line is packaged, and wall thickness is about 0.01~2mm.Nylon, polytetrafluoroethylene (PTFE), PVC, glass fibers of the insulation core wire using commercialization
Flexible insulations organic wire or the tubing such as beam, polytetrafluoroethylene (PTFE) are tieed up, line footpath is Φ 0.5mm~15mm.As coiling fixed core and
The load body of signal transmssion line.
It is proved below by two specific embodiments.
Embodiment 1:
Fig. 2 is transmission line for the electromagnetism interference experimental data that airway temperature measures between dry-type air-core reactor encapsulating
Figure.For the voltage signal transmission for the thermocouple sensor that airway temperature between the encapsulating of dry-type air-core reactor measures, reactor
Rated capacity 1000kvar, voltage rating 2100V, rated current 476A, inductance ratings 14.04mH, working frequency 50Hz.
Signal transmssion line uses the parallel winding method of overlay film copper conductor, transmission line unit just around, back-roll each 100 circle of the number of turns, it is internal absolutely
Edge core wire uses glass fiber bundle (diameter 2mm), and outer cladding big envelope gorgeous absolutely uses the high temperature heat-resistant draw, length of transmission line 3.5m.
Temperature transducer is transmitted line output terminal and is then passed through compensating wire access using the signal input part of T-type thermocouple access transmission line
Temperature sensing module.Transmission line output terminal above earth potential is about 0.3V under actual measurement operating condition, output end differential voltage≤0.005mV,
Under 30 DEG C of operating temperatures, T-type thermocouple temperature measurement, transmission line output potential~1.65mV, even if in reactor make and break process,
Temperature signal output is still able to maintain stabilization, shows good anti-interference and reliability.
Embodiment 2:
Fig. 3 is the electromagnetism interference experimental data figure that transmission line is used for the measurement of reactor with T-shaped core iron on the yoke temperature.
The iron yoke monitoring temperature operating condition of reactor with T-shaped core for 480kvar, the voltage rating 381kV of reactor, rated current
420A, inductance ratings 2.89mH, working frequency 50Hz.The temperature measurement of reactor upper yoke is sensed using thermal resistance pt100
Device, test job electric current are direct current 0.3A, and signal transmssion line uses the parallel winding method of overlay film copper conductor, and transmission line unit is just
Around, back-roll each 50 circle of the number of turns, line footpath 0.3mm, 33 circles of circle density/cm, built-in electrical insulation core wire use polytetrafluoroethylene (PTFE) wire rod (diameter
4mm), outer cladding big envelope gorgeous absolutely uses glass fibre sleeve, length of transmission line 5.5m.It surveys and transmits line output terminal over the ground under operating condition
Current potential is about 0.1V, output end differential voltage≤0.01mV, at room temperature monitoring temperature, is tested under varying load condition, right
In strong electromagnetic interference environment, temperature signal output is still able to maintain stabilization, shows good anti-interference and reliability.
The above descriptions are merely preferred embodiments of the present invention, not makees in any form to the utility model
Limitation be not intended to limit the utility model although the utility model has been disclosed with preferred embodiment as above, it is any ripe
Know professional and technical personnel, do not departing within the scope of technical solutions of the utility model, when using the disclosure above method and
Technology contents make a little change or the equivalent embodiment for being modified to equivalent variations, but all without departing from the utility model technology
The content of scheme, it is made by the above technical examples according to the technical essence of the present invention it is any it is simple modification, equivalent variations with
Modification, is still within the scope of the technical solutions of the present invention.
Claims (8)
1. a kind of weak electric signal transmission line for dry-type reactor interturn insulation detection, it is characterised in that: held including transmission line
Power body, the outer surface of the transmission line load body are wound with conducting wire, and the conducting wire is on the surface of transmission line load body using positive
Coiling and oppositely wound alternating, continuous mode are repeated cyclically coiling, and positive coiling is identical with oppositely wound the number of turns, circle is close
Spend identical, one coiling unit of a positive coiling section and an oppositely wound section of composition, the transmission line outer surface after coiling
It is packaged with insulation encapsulated layer.
2. a kind of weak electric signal transmission line for dry-type reactor interturn insulation detection according to claim 1, special
Sign is: the transmission line load body is flexible insulation core wire, and the material of flexible insulation core wire can be PVC wire rod, nylon wire
Material, polytetrafluoroethylene (PTFE) wire rod, glass fiber bundle wire rod or tubing.
3. a kind of weak electric signal transmission line for dry-type reactor interturn insulation detection according to claim 1, special
Sign is: the conducting wire is used with insulating layer, non-magnetic two-wire or multi-thread, the two-wire or it is multi-thread can be twisted wire,
It can be parallel wires.
4. a kind of weak electric signal transmission line for dry-type reactor interturn insulation detection according to claim 1, special
Sign is: the material of the conducting wire is copper or aluminium, and the diameter of conducting wire is 0.1mm~2mm.
5. a kind of weak electric signal transmission line for dry-type reactor interturn insulation detection according to claim 1, special
Sign is: the circle density of the conducting wire coiling is 2~100 circles/cm.
6. a kind of weak electric signal transmission line for dry-type reactor interturn insulation detection according to claim 1, special
Sign is: the total number of turns of the coiling unit is 2~100 circles.
7. a kind of weak electric signal transmission line for dry-type reactor interturn insulation detection according to claim 2, special
Sign is: the flexible insulation core line diameter is 0.5~15mm.
8. a kind of weak electric signal transmission line for dry-type reactor interturn insulation detection according to claim 1, special
Sign is: the insulation encapsulated layer material is the insulating sleeves such as heat-shrink tube, PVC, nylon, glass fiber bundle, polytetrafluoroethylene (PTFE), absolutely
The wall thickness of edge casing is 0.01~2mm.
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CN201920247531.9U CN209561075U (en) | 2019-02-26 | 2019-02-26 | A kind of weak electric signal transmission line for dry-type reactor interturn insulation detection |
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CN201920247531.9U CN209561075U (en) | 2019-02-26 | 2019-02-26 | A kind of weak electric signal transmission line for dry-type reactor interturn insulation detection |
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