CN104835587A - Electric leakage protection cable between wires - Google Patents
Electric leakage protection cable between wires Download PDFInfo
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- CN104835587A CN104835587A CN201510281235.7A CN201510281235A CN104835587A CN 104835587 A CN104835587 A CN 104835587A CN 201510281235 A CN201510281235 A CN 201510281235A CN 104835587 A CN104835587 A CN 104835587A
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- earth leakage
- electric wire
- leakage protective
- protective cable
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Abstract
The invention discloses an electric leakage protection cable between wires, and is matched with an electric leakage switch for low-voltage distribution for use. The structure of the electric leakage protection cable between wires includes a wire core conductor, an insulating medium layer, a separation net layer conductor and a sheath insulating layer from inside to outside, the separation net layer is used as a separator between wires for protective grounding/a null line. The electric leakage protection cable between wires overcomes the deficiency that a current electric leakage protection method cannot detect leakage current between wires and thus cannot perform electric leakage protection between wires. By using the electric leakage protection cable between wires to be matched with the electric leakage switch for use, electric leakage protection between wires can be effectively performed, thereby preventing a short circuit between the wires and ignition from causing a fire accident.
Description
Technical field
The present invention relates to electrical safety technical field, more particularly, relate to earth leakage protective cable between a kind of electric wire.
Background technology
The effect of leakage switch is the leakage current that leaks detecting electricity consumption loop, when leakage current meets or exceeds setting value, disconnects protected circuit, thus prevents electric shock accidents, guarantee personal safety.But leak electricity between the line between the same circuit inside conductor and wire, leakage switch but cannot detect.Because this electric current is not to external leakage, belong to the electric current in loop, be difficult to distinguish with load current complicated and changeable.That is, existing earth leakage protecting method cannot be protected electric leakage between line.And in actual life, because distribution line is by the impact of the reason such as aging, burn into damaged by rats, wearing and tearing, humidity, outer heat, overload, and form electric leakage, short short circuit, cause high temperature, arcing, sparking etc. and even initiation fire.The economy of the lives and properties of people and country, historical relic culture etc. is taken a bath.Such case is of common occurrence, and in increasing trend year by year.
Strengthen the dielectric strength of wire, can electric leakage be reduced, prevent or delay the generation of electric leakage accident.But the phenomenon such as aging of dielectric always exists, and the time limit used along with supply line is more of a specified duration, and the danger of the initiation fire that leaks electricity between line is larger.Due to the complexity with line, wiring and load, make having more disguised and being difficult to predictability of leakage fire accident.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, earth leakage protective cable between a kind of electric wire preventing to leak electricity between electric wire is provided.Between this electric wire, earth leakage protective cable makes the defencive function of existing leakage switch expand between electric wire, prevents the generation of initiation fire accident.
The object of the present invention is achieved like this: earth leakage protective cable between a kind of electric wire; with the leakage switch of low-voltage distribution with the use of; between electric wire, the structure of earth leakage protective cable comprises core conductor, insulating medium layer, isolation mesh conductor, jacket insulation layer from the inside to the outside, and described isolation mesh is as slider between line and do protective earthing/zero line and use.
Described isolation mesh conductor is the netted separator be woven into zinc-plated soft copper bare wire, and the mesh of netted separator opens the area of section that maximum area is less than core conductor.
In three-phase four-wire power supply loop, have the live wire after a switch to use common wiring, the power line after its excess-three bar switch uses earth leakage protective cable between described electric wire.
Between the electric wire after three switches in earth leakage protective cable, between first, second, third electric wire, the isolation mesh conductor of earth leakage protective cable connects the metal shell port of threephase load, and described metal shell port connects ground wire.Article 1, between electric wire, the core conductor of earth leakage protective cable connects the live wire end of threephase load; between Article 2 electric wire, the core conductor of earth leakage protective cable connects second live wire end of threephase load, and between Article 3 electric wire, the core conductor of earth leakage protective cable connects the zero line side of single-phase load.
In the single-phase load current supply circuit of the two poles of the earth leakage switch; zero line after switch uses earth leakage protective cable between electric wire; between electric wire, the isolation mesh conductor of earth leakage protective cable connects the metal shell port of load; described metal shell port connects ground wire, and between electric wire, the core conductor of earth leakage protective cable connects the zero line side of load.
Above-mentioned is the connection in TT system; in the single-phase load current supply circuit of TN system the two poles of the earth leakage switch; between electric wire, the isolation mesh conductor of earth leakage protective cable connects the metal shell port of load; between electric wire, the core conductor of earth leakage protective cable connects the zero line side of load; the zero line of isolation mesh conductor parallel connection access leakage switch end of incoming cables, forms protective earthing-neutral conductor by zero line protection together with work grounding line.
Beneficial effect of the present invention is:
1) instant invention overcomes existing earth leakage protecting method can not detect the leakage current between electric wire so that earth leakage protective weak point between line can not be carried out.Utilize earth leakage protective cable between electric wire, with leakage switch with the use of, effectively can carry out earth leakage protective between line, prevent the initiation fire such as short circuit, sparking accident between electric wire.
2) in supply line, use earth leakage protective cable between electric wire of the present invention, when human body insulation against ground contingent phase line and phase line, human electric shock's accident between phase line and zero line can be avoided, the available protecting electric operation safety of people.
3) use earth leakage protective cable between electric wire of the present invention, the drain conditions between electric wire can be made to be become can be detected at any time by the current detection that is difficult to.As: can at the electric current of leakage switch end of incoming cables measuring and protecting connecting to neutral line to TN system.The electric current of total earth connection can be measured to TT system.Like this to the warning of electric wire electric leakage initiation fire, foresight and accuracy can be had more.
Accompanying drawing explanation
Fig. 1 be earth leakage protective cable between electric wire of the present invention line between earth leakage protective general principle block diagram.
Fig. 2 is the conductor structure schematic diagram of earth leakage protective cable between electric wire of the present invention.
Fig. 3 is the cross-sectional view of earth leakage protective cable between electric wire of the present invention.
Fig. 4 is execution mode one structural representation of earth leakage protective cable between electric wire of the present invention.
Fig. 5 is execution mode two structural representation of earth leakage protective cable between electric wire of the present invention.
Fig. 6 is execution mode three structural representation of earth leakage protective cable between electric wire of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
As shown in figures 1 to 6; earth leakage protective cable 10 between electric wire of the present invention; be with the leakage switch of low-voltage distribution with the use of; between electric wire, the structure of earth leakage protective cable comprises core conductor 1, insulating medium layer 2, isolation mesh conductor 3, jacket insulation layer 4 from the inside to the outside, and described isolation mesh is as slider between line and do protective earthing/zero line and use.
Described isolation mesh conductor is the netted separator be woven into zinc-plated soft copper bare wire, and the mesh of netted separator opens the area of section that maximum area is less than core conductor.
In three-phase four-wire power supply loop, have the live wire after a switch to use common wiring, the power line after its excess-three bar switch uses earth leakage protective cable 10 between described electric wire.Between the electric wire after leakage switch 11 in earth leakage protective cable, first, between Article 2 electric wire, the isolation mesh conductor of earth leakage protective cable connects the metal shell port of threephase load 12, described metal shell port earth connection, Article 1, between electric wire, the core conductor of earth leakage protective cable connects the live wire end of threephase load, between Article 2 electric wire, the core conductor of earth leakage protective cable connects second live wire end of threephase load, between Article 3 electric wire, the isolation mesh conductor of earth leakage protective cable connects ground wire, between Article 3 electric wire, the core conductor of earth leakage protective cable connects the zero line side of single-phase load 13.
In TT system, (power end is direct ground connection a bit; load-side exposed conductive part is directly electrically connected over the ground; but have nothing to do with any earth point of electric power system) the two poles of the earth leakage switch single-phase load current supply circuit in; zero line after switch uses earth leakage protective cable between electric wire; between electric wire, the isolation mesh conductor of earth leakage protective cable connects the metal shell port of load; described metal shell port earth connection, between electric wire, the core conductor of earth leakage protective cable connects the zero line side of load.
In the single-phase load current supply circuit of the two poles of the earth leakage switch of TN system; between electric wire, the isolation mesh conductor of earth leakage protective cable connects the metal shell port of load; between electric wire, the core conductor of earth leakage protective cable connects the zero line side of load; the zero line of isolation mesh conductor parallel connection access leakage switch end of incoming cables, forms protective earthing-neutral conductor by zero line protection together with work grounding line.Namely the zero line wiring core conductor after leakage switch 11, isolation mesh conductor is as protective wire, zero line protection, and the metal shell port of load 13 connects isolation mesh conductor, connects the zero line before leakage switch 11 simultaneously.
Between line, the general principle of earth leakage protecting method as shown in Figure 1.Between current supply line L and N, insulated conductor G is set, and by insulated conductor G ground connection.Insulation between wire L and N is deteriorated, and when there is electric leakage, owing to having set up insulated conductor G, leaks electricity by G gear section.When the leakage current of L to G meet or exceed leakage switch adjust operating current time, leakage switch action, in time cuts off protected circuit power, thus avoids sparking to cause fire.Slider is quite just a stifled fire compartment wall.
Realize earth leakage protective method between electric wire, crucial problem how between electric wire, to arrange slider, and way is a kind of cable with separator of design.The structure of this cable is on the basis of existing insulated electric conductor, outside its insulating medium layer, increases one deck by the webbed separator of copper wire woven, as the screen of shielded type cable.This cable is referred to as earth leakage protective cable between electric wire because of its function, and its conductor structure as Figure 2-3, comprises interior lines core conductor 1 and outer isolation mesh conductor 3.Between electric wire, the structure of earth leakage protective cable from the inside to surface respectively: core conductor 1, insulating medium layer 2, isolation mesh 3 and jacket insulation layer 4.
To the basic demand of earth leakage protective cable in production between electric wire be:
(1) part within isolation mesh presses the standard production of insulated electric conductor.
(2) the zinc-plated soft copper bare wire of separator is woven into netted, and mesh opens and is less than core cross-sectional area of conductor, and mesh is evenly distributed, and copper cash total sectional area is not less than core cross-sectional area of conductor and amasss.Copper cash can not be meticulous, will consider anti-aging, durable together with insulated electric conductor, and the requirement that satisfied different occasion uses.
(3) jacket insulation has required to insulate, protecting insulating layer do not make moist, the effect of anticorrosive, resistant to mechanical damage.
(4) tint outside restrictive coating, advise, on the basis of existing protective earthing (zero) Huang used/green phase top-stitching, adding monochromatic dotted line.Monochrome selects redness or blueness.
Between the electric wire of a single core in earth leakage protective cable, contain two independently wires.Wherein core conductor is as the supply lines in loop, can make the neutral line, also can make phase line and use.Isolation mesh wire, then both as slider between line, uses as protective earthing (zero) line again.Like this, this cable can be widely used in needing to carry out earth leakage protective various power transmission and distribution occasion, and in connecting line for common electric distribution.This earth leakage protective cable and existing leakage switch with the use of, both can prevent electric shock accidents, and can prevent again electric leakage, short circuit, earth fault etc. between line from causing the generation of electrical fire.
Below, for TT system, introduce the typical wiring method of earth leakage protective cable between two kinds of application electric wires.For at TN systematic difference, introduce the mode of connection of a typical loop:
The loop structure schematic diagram of three-phase four-wire system power supply four pole leakage switch for power and lightings in TT system see Fig. 4-6, Fig. 4, Fig. 5 be in TT system single phase poaer supply the two poles of the earth leakage switch for the loop of single-phase load.Fig. 6 is the loop that single phase poaer supply the two poles of the earth leakage switch supplies single-phase load in TN system.From above three typical wiring figure, also have following problem deserving of attention: 1) as shown in Figure 4, in three-phase four-wire power supply loop, three electric wires be had to adopt earth leakage protective cable, power supply cost is higher than original beyond doubt.But, in the single phase distribution loop of Fig. 5 and Fig. 6, only need an electric wire to adopt earth leakage protective cable.And two wires of this cable just in time instead of the original neutral line and protective earthing (zero) line.So, in this case, power supply cost substantially be originally the same.At the last one kilometer of electrical network, be more residential building, government departments and institutions, illumination, household electrical appliance, office electrical equipment etc., mostly be single phase power supply.Therefore, adopt earth leakage protective cable distribution between electric wire, carry out preventing electric shock accidents, prevent earth fault, can prevent again comprehensive earth leakage protective of electric leakage, short circuit initiation fire etc. between electric wire, be worthwhile economically.
2) no matter the core conductor of earth leakage protective cable is as working zero line or phase line, all will pass leakage switch zero sequence current mutual inductor.Wiring will be noted sitting in the right seat, and every root line is corresponding with the terminals of the inlet wire of leakage switch, outlet.From the corresponding leading-out terminal of leakage switch, access the core conductor of earth leakage protective cable, then receive the terminals of each load always.
3) wiring is protected.The isolation mesh conductor of earth leakage protective cable is earth leakage protective layer between line, uses, not through zero sequence current mutual inductor again as protective earthing or zero line protection wire.Access from leakage switch place, in order to ensure that earth leakage protective does not stay dead band on the circuit of electricity consumption, there received by power line, and isolation mesh conductor is just applied to there.In TT system, isolation mesh conductor is as protective earthing line, from the distribution box metal shell access of installing leakage switch.And in TN system, isolation mesh conductor is then from the neutral line end of incoming cables of parallel connection access leakage switch, zero line protection forms protective earthing-neutral conductor together with work grounding line.
4) operational mode.The application of earth leakage protective cable between electric wire, just makes between earth leakage protective expanded range to electric wire, and does not change the operational mode of system.Therefore, original points for attention of closing in rule and use of leakage protection system still will be observed.As: during for earthing electric network, system zero line must not iterative earthing; Equipment component protective earthing is not allowed, another part equipment protection connecting to neutral in same system; Carry out periodical test inspection work etc.
5) expansion of applying.As can be seen from above listed typical apply figure also; between line, earth leakage protective cable is except application in confession distribution fixed line; also can use on mobile link line; as in three socket power plankers and common electric electric power connection line; to replace the original neutral line with the core conductor of earth leakage protective cable between line; isolation mesh conductor replaces original Huang/green alternate protective wire, retains original phase line.Earth leakage protective cable can also be applied in existing low-voltage electrical cable; as in two core cable; the insulating barrier of a heart yearn wire is additional around netted separator wherein; just can make earth leakage protective cable between two core electric wires; for not only needing use cable power supply but also needing to carry out earth leakage protective place, prevent from leaking electricity between cable initiation fire.
Although illustrate and describe embodiments of the invention; those of ordinary skill in the art is to be understood that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim; scope of the present invention limited by claim and equivalent replacement thereof; in the improvement etc. done without creative work, all should be included within protection scope of the present invention.
Claims (6)
1. earth leakage protective cable between an electric wire; with the leakage switch of low-voltage distribution with the use of; it is characterized in that: between electric wire, the structure of earth leakage protective cable comprises core conductor, insulating medium layer, isolation mesh conductor, jacket insulation layer from the inside to the outside, described isolation mesh uses as slider between line and protective earthing/zero line.
2. earth leakage protective cable between electric wire according to claim 1, is characterized in that: described isolation mesh conductor is the netted separator be woven into zinc-plated soft copper bare wire, and the mesh of netted separator opens the area of section that maximum area is less than core conductor.
3. earth leakage protective cable between electric wire according to claim 1 and 2, is characterized in that: in three-phase four-wire power supply loop, and have the live wire after a switch to use common wiring, the power line after its excess-three bar switch uses earth leakage protective cable between described electric wire.
4. earth leakage protective cable between electric wire according to claim 3, it is characterized in that: between the electric wire after three switches in earth leakage protective cable, first, between Article 2 electric wire, the isolation mesh conductor of earth leakage protective cable connects the metal shell port of threephase load, described metal shell port earth connection, Article 1, between electric wire, the core conductor of earth leakage protective cable connects the live wire end of threephase load, between Article 2 electric wire, the core conductor of earth leakage protective cable connects second live wire end of threephase load, between Article 3 electric wire, the isolation mesh conductor of earth leakage protective cable connects ground wire, between Article 3 electric wire, the core conductor of earth leakage protective cable connects the zero line side of single-phase load.
5. earth leakage protective cable between electric wire according to claim 1 and 2; it is characterized in that: in the single-phase load current supply circuit of the two poles of the earth leakage switch; zero line after switch uses earth leakage protective cable between electric wire; between electric wire, the isolation mesh conductor of earth leakage protective cable connects the metal shell port of load; described metal shell port earth connection, between electric wire, the core conductor of earth leakage protective cable connects the zero line side of load.
6. earth leakage protective cable between electric wire according to claim 1 and 2; it is characterized in that: in the single-phase load current supply circuit of TN system the two poles of the earth leakage switch; between electric wire, the isolation mesh conductor of earth leakage protective cable connects the metal shell port of load; between electric wire, the core conductor of earth leakage protective cable connects the zero line side of load; on the zero line of isolation mesh conductor parallel connection access leakage switch end of incoming cables, form protective earthing-neutral conductor by zero line protection together with work grounding line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510281235.7A CN104835587A (en) | 2015-05-28 | 2015-05-28 | Electric leakage protection cable between wires |
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| CN201510281235.7A CN104835587A (en) | 2015-05-28 | 2015-05-28 | Electric leakage protection cable between wires |
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| CN104835587A true CN104835587A (en) | 2015-08-12 |
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| CN201510281235.7A Pending CN104835587A (en) | 2015-05-28 | 2015-05-28 | Electric leakage protection cable between wires |
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Citations (8)
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| GB1064261A (en) * | 1963-05-31 | 1967-04-05 | Benno Palatini | Device for heating electrically objects of large surface area |
| US3493815A (en) * | 1967-07-19 | 1970-02-03 | Gen Electric | Electric protective system |
| US3769549A (en) * | 1972-08-07 | 1973-10-30 | Gen Electric | Electrical fire and shock protective apparatus |
| CN1395345A (en) * | 2001-07-02 | 2003-02-05 | 打矢恒温器株式会社 | Power supply line with safety protective device |
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| CN201111991Y (en) * | 2007-09-25 | 2008-09-10 | 上海益而益电器制造有限公司 | Supply line with electric leakage testing conductor |
| CN102024519A (en) * | 2009-09-11 | 2011-04-20 | 通领科技集团有限公司 | Cable with electric leakage detecting function |
| CN204596526U (en) * | 2015-05-28 | 2015-08-26 | 顺德职业技术学院 | Earth leakage protective cable between a kind of electric wire |
-
2015
- 2015-05-28 CN CN201510281235.7A patent/CN104835587A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1064261A (en) * | 1963-05-31 | 1967-04-05 | Benno Palatini | Device for heating electrically objects of large surface area |
| US3493815A (en) * | 1967-07-19 | 1970-02-03 | Gen Electric | Electric protective system |
| US3769549A (en) * | 1972-08-07 | 1973-10-30 | Gen Electric | Electrical fire and shock protective apparatus |
| CN1395345A (en) * | 2001-07-02 | 2003-02-05 | 打矢恒温器株式会社 | Power supply line with safety protective device |
| CN201066598Y (en) * | 2007-05-22 | 2008-05-28 | 上海益而益电器制造有限公司 | A power cable for detecting leakage current based on metal foil |
| CN201111991Y (en) * | 2007-09-25 | 2008-09-10 | 上海益而益电器制造有限公司 | Supply line with electric leakage testing conductor |
| CN102024519A (en) * | 2009-09-11 | 2011-04-20 | 通领科技集团有限公司 | Cable with electric leakage detecting function |
| CN204596526U (en) * | 2015-05-28 | 2015-08-26 | 顺德职业技术学院 | Earth leakage protective cable between a kind of electric wire |
Non-Patent Citations (1)
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Application publication date: 20150812 |