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The problem is readily solved by an additional arrester at the nextto-last transformer In fact, this second arrester practically obliterates the impulse, providing effective protection for the rest of the cable system as well Thus, some consider the most optimal UD cable protection configuration to be three arresters: a riser-pole arrester, an open-point arrester, and an arrester at the transformer next closest to the open point This choice protects as well as having arresters at all transformers and is less costly, particularly in retrofitting
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Under-oil arresters Transformer manufacturers can supply padmounted transformers for UD cable systems with the primary arresters inside the transformer compartment, under oil If applied consistently, this achieves very good protection of the UD cable system by having arresters distributed along the cable Of course, this protection comes at an incremental cost that must be evaluated to determine if it is economical for a utility to consider Elbow arresters The introduction of elbow arresters for transformer
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connections in UD cable systems has opened up protection options not previously economical Previously, arrester installations on UD cable systems were adaptations of overhead arrester technology and were costly to implement That is one reason why open-point arresters have not been used universally The other alternative was under-oil arresters and it is also very costly to change out a pad-mount transformer just to get an open-point arrester Now, the arrester is an integral part of the UD system hardware and installation at nearly any point on the system is practical This is a particularly good option for many retrofit programs
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The gapped MOV arrester technology described earlier in this chapter was developed specifically to improve the surge protection for UD cables and prolong their life The arresters are able to achieve a substantially lower discharge voltage under lightning surge conditions while still providing the capability to withstand normal system conditions By combining the gaps from the old SiC technology with fewer MOV blocks, a 20 to 30 percent gain could be made in the lightning protective margin The gaps share the voltage with the MOV blocks during steady-state operation and prevent thermal runaway Following the logic of the Hopkinson formula, presented at the beginning of this section, converting to this kind of arrester in the UD cable system can be expected to yield a substantial increase in cable life
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Fluid injection This is a relatively new technology in which a restora-
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tive fluid is injected into a run of cable The fluid fills the voids that have been created in the insulation by aging and gives the cable many more years of life A vacuum is pulled on the receiving end and pressure is applied at the injection end If there are no splices to block the flow, the fluid slowly penetrates the cable
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455 Scout arrester scheme
The idea of using a scout arrester scheme to protect utility UD cable runs goes back many years13 However, the idea has only been applied sporadically because of the additional initial expense The concept is relatively simple: Place arresters on either side of the riser-pole arrester to reduce the lightning energy that can enter the cable Figure 437 illustrates the basic scheme The incoming lightning surge current from a strike downline first encounters a scout arrester A large portion of the current is discharged into the ground at that location A smaller portion proceeds on to the riser-pole arrester, which now produces a smaller discharge voltage It is this voltage that is impressed upon the cable To further enhance the protection, the first span on either side of the riser pole can be shielded to prevent direct strokes to the line More recently, there has been a revival of interest in the scheme14 There is empirical evidence that the scout scheme helps prevent openpoint failures of both cables and transformers, and the expense of changing out a transformer far exceeds the additional cost of the scout arresters Simulations suggest that while the nominal arrester disINCOMING SURGE
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