Polymeric metal oxide surge arrester
Technical field
The utility model relates to the metal oxide arrester that is installed in generating circuit, transmission line, power transformation or the distribution line system.
Background technology
Metal oxide arrester is made up of the binding post that the metal oxide resistor valve block that is built in insulating sleeve constitutes lightning-arrest core body and lightning-arrest core body two ends stube cable jointly.This lightning arrester is installed in the system line; The lightning-arrest valve block of metal oxide resistor is bearing system line transmission voltage, overvoltage, harmonic voltage burden all the time; And with small leakage current; The existence of leakage current can produce certain heating, has both influenced the lighting protection performance, so also shortened the useful life of the lightning-arrest valve block of resistance.
Summary of the invention
The goal of the invention of the utility model is to provide a kind of can thoroughly block the polymeric metal oxide surge arrester that lightning arrester is connected in the leakage current in the system line.The polymeric metal oxide surge arrester technical scheme that the utility model provides; Its major technique content is: mold pressing is connected with the dead ring of formation discharging gap between a kind of polymeric metal oxide surge arrester, an end of the metal oxide resistor valve block in the insulating sleeve of lightning-arrest core body and corresponding wiring terminal interior extreme.
In above-mentioned overall technical architecture, disconnector laterally embeds insulating sleeve, and the electrode tip that disconnector embeds in the insulating sleeve extremely is connected with the binding post of the other end of metal oxide resistor valve block is interior.
In above-mentioned overall technical architecture, the upper connecting terminal of lightning-arrest core body is a penetrating cable clamp type binding post.
The polymeric metal oxide surge arrester that the utility model provides is connected in the operate as normal system line; Wherein discharging gap dead ring has blocked that the metal oxide resistor valve block is born system line voltage and the possibility that produces leakage current; Lightning arrester is effectively prolonged useful life; Its discharging gap dead ring is conducting when the experience thunderbolt is breakdown only; The voltage that will be struck by lightning puts on the metal oxide resistor valve block, relies on the non-linear voltage-current characteristic performance system line lightning protection effect of metal oxide resistor valve block, thereby has got rid of the potential safety hazard in its system line connection.
Description of drawings
Accompanying drawing is the structure construction figure of this polymeric metal oxide surge arrester.
Embodiment
The disclosed polymeric metal oxide surge arrester of present technique scheme; Its structure is shown in accompanying drawing; Be provided with metal oxide resistor valve block 2 in the high strength insulating sleeve 4 of its lightning-arrest core body 1; The upper end of interior metal oxide resistor valve block 2 and corresponding wiring terminal interior extreme 5 between also mold pressing be connected with dead ring 3, this dead ring 3 is processed by high strength, high voltage insulating materials, as is epoxy fibreglass ring, SMC ring, DMC ring, high strength china ring etc.; Between binding post and metal oxide resistor valve block 2, form discharging gap, the height of this dead ring depends on the discharge voltage value.Insulating sleeve 4 surface sulfurations have silicon rubber insulation full skirt outer 7.Interior extreme 5 of the binding post penetrating cable clamp 6 that is threaded, cable just need not broken string like this, and the completion lightning arrester connects under the cable status not damaging, and is easy to guarantee to be electrically connected the reliability of performance.
Occur to cut out system line automatically when electric property is bad in order to be implemented in reach capacity useful life or its of lightning arrester; In this enforcement structure, also increase disconnector 9 is arranged; This disconnector 9 laterally embeds insulating sleeve 4; Electrode tip in the disconnector 9 embedding insulating sleeves 4 is connected with interior extreme 8 of the binding post 10 of metal oxide resistor valve block 2 other ends, and when above-mentioned state occurring, this disconnector explodes immediately; Produce tangible circuit and connect breakpoint, this lightning arrester is cut out system line from the state of putting into operation.