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ABOUT COMPANY Events Contact us OHL 6-10KV SOLUTIONS OHL 20-220KV SOLUTIONS | Eng

LOOP-TYPE LONG FLASH-OVER ARRESTERApplicationThis arrester having LFA-L official short title in accordance with 2002 Technical conditions passed all necessary tests, certified and accepted for serial production and application in power systems by interdepartmental commission. LFA-L arrester is designed to protect 6, 10 kV three-phase AC power transmission overhead lines with open and shielded wires from induced lightning overvoltage and its secondaries and intended for operation in open air at -60C to +50C temperature. Its lifetime is 30 years. Now LFA-L 1 arresters are widely used in different regions of Russia in construction of new OHL and in reconstruction and retrofitting of existing 6, 10kV overhead lines according to project solutions based on necessary technical documentation developed by R&D Center for Power Engineering. Number of arresters successfully operating in many regions of Russia exceeds 300 000.

External appearance

Principle of operation Specifications Installation

PresentationsStreamer main presentation Multi-chamber system

VideoMulti-chamber system 1 Multi-chamber system 2 Multi-chamber system 3 Multi-chamber system 4Copyright 2010 Streamer Inc. All rights reserved. Address: Office 17N, 147 Nevsky prospect, Saint-Petersburg 1910 Russia Phone: +7 (812) 327 0808 Fax: +7 (812) 327 3444 E-mail: info@streamer.ru

ABOUT COMPANY OHL 6-10KV SOLUTIONS OHL 20-220KV SOLUTIONS | Eng

MODULAR LONG FLASH-OVER ARRESTERApplicationModular Long Flash-over arrester (LFA-M) is designed to protect 6, 10 kV three-phase AC open and shielded wires OHL and substation approach zones from direct lightning strikes and induced lightning overvoltages. Since LFA-M has best volt-time characteristics it is reasonably to use it for protection of line sections amenable to direct lightning strikes and OHL substation approach zones. LFA-M consists of two LDPE resistor cord cable sections connected by collars. The arrester is equipped with end terminals designed to connect the arrester to wire and bracket to connect the latter to OHL tower. Fitting elements are additionally connected with tower end by grounding bar. Wire clamp design has two modifications permitting to mount the arrester as on open as on shielded wires for existing bite-through barbs. Long-flashover arrester lightning protection technique is suitable for use with any type of towers concrete, metal, wood, with any type of insulators rod-type, terminal, suspension, porcelain, glass, polymer and wires open and shielded..

External appearance

Principle of operationLFA-M consists of two resistor cord cable sections. These sections are connected in such a way that produce three discharge modules 1, 2, 3. Resistor cord sections are connected to end terminals through inner spark gaps 1, 2, 3, 4. Under lightning overvoltage impulse these gaps are flashed over and upper cable section resistor cord with R resistance carry high potential U to the center of the lower cable section surface. Similarly, the lower cable section resistor cord with resistance R carry high potential 0 to the center of the upper cable section surface. Thus full voltage U is applied simultaneously to each discharge module and conditions for simultaneous development of surface discharges that under flashover of respective modules producing a single long flashover channel for all discharge modules 1,2,3 are provided.

Specifications

Voltage rate Surface flashover length Pulse 50% discharge voltage, at most Positive polarity Negative polarity 10- insulator matching voltage

10 kV 1500 mm

100 kV 90 kV 300 50 impulses

Inner insulation withstand pulse voltage, at least 300 kV Fundamental frequency withstand voltage, at least In dry condition In the rain 42 kV 28 kV 20 impulses Multiply withstand pulse current 8/20 s, at least 40 kA Weight Lifetime, at least 1,6 kg 30 years

InstallationIn case it is necessary to provide guaranteed protection against any lightning impacts including direct lightning strike each tower of the OHL protected section should be equipped with three LFA-M modular-type arrester, one per phase. In this case it is necessary to provide low (10 Ohm at most) grounding resistance only for three nearest towers of substation approach zone. According to lightning protection requirements the rest of towers need no grounding. If according to feasibility study it is reasonable to protect only separate OHL sections from direct lightning strike, the protection should be of the following arrangement. Each tower phase of this section

should be equipped with three modular-type LFA-M arresters. Two extreme towers of the protected OHL section should be grounded and grounding resistance should not exceed 10 Ohm. If for objective reasons this requirement fails it should be compensated by additional grounding of one more or some other adjacent extreme towers of this section. Other towers of this section need no special grounding.

Protection of substation approach zoneTo protect substation approach zone from lightning overvoltage incoming waves it is necessary to install a set of three LFA-M onto each of the four towers nearest to the substation. This tower should be grounded according to existent requirements. Mounting of LFA-M arrester sets permits to eliminate close-substation shot-circuits caused by lightning overvoltages and leading to fatal electro-dynamic strokes for transformer windings efficiently increasing reliability and lifetime of towers.

PresentationsStreamer main presentation Multi-chamber system

VideoMulti-chamber system 1 Multi-chamber system 2 Multi-chamber system 3 Multi-chamber system 4Copyright 2010 Streamer Inc. All rights reserved. Address: Office 17N, 147 Nevsky prospect, Saint-Petersburg 1910 Russia Phone: +7 (812) 327 0808 Fax: +7 (812) 327 3444 E-mail: info@streamer.ru

| Eng

ABOUT COMPANY OHL 6-10KV SOLUTIONS OHL 20-220KV SOLUTIONS

COMPACT MODULAR LONG FLASH-OVER ARRESTER

ApplicationLFA-M-c arresters are intended to protect 6, 10kV three-phase AC compact wire (open and shielded) arrangement OHL with minimal interwire distance of 50cm and 20 class insulators in areas with the second degree of atmospheric pollution.

External appearance

Principle of operation Specifications Installation

PresentationsStreamer main presentation

Multi-chamber system

VideoMulti-chamber system 1 Multi-chamber system 2 Multi-chamber system 3 Multi-chamber system 4Copyright 2010 Streamer Inc. All rights reserved. Address: Office 17N, 147 Nevsky prospect, Saint-Petersburg 1910 Russia Phone: +7 (812) 327 0808 Fax: +7 (812) 327 3444 E-mail: info@streamer.ru

| Eng

ABOUT COMPANY OHL 6-10KV SOLUTIONS OHL 20-220KV SOLUTIONS

DOUBLE LONG FLASH-OVER ARRESTERApplicationThe arrester is designed to protect 6, 10 kV three-phase AC open and shielded wires OHL from induced lightning overvoltages and its secondaries when it is necessary to use double fitting of wires.

Principle of operation Specifications Installation External appearance

PresentationsStreamer main presentation Multi-chamber system

VideoMulti-chamber system 1 Multi-chamber system 2 Multi-chamber system 3 Multi-chamber system 4Copyright 2010 Streamer Inc. All rights reserved. Address: Office 17N, 147 Nevsky prospect, Saint-Petersburg 1910 Russia Phone: +7 (812) 327 0808 Fax: +7 (812) 327 3444 E-mail: info@streamer.ru

ABOUT COMPANY OHL 6-10KV SOLUTIONS

OHL 20-220KV SOLUTIONS | Eng

OHL 20-220KV SOLUTIONSOver recent years, Streamer Research and Production Company has been active in development of so called arresters with multi-chamber system (MCS), succeeding in production of new 10 to 220 kV arresters , as well as a novel device termed multi-chamber system insulator arrester (MCIA) which combines properties and functions of arrester and insulator. Application of MCIAs makes it possible to ensure lightning protection of overhead lines of any voltage ratings: the higher the line voltage, the larger the number of units in a string and thus the higher the rated voltage and the arc-quenching capacity of a string of insulator arresters. Various designs of insulators with arrester properties are possible. An MCIA is generally a production glass, porcelain, or composite insulator fitted with an MCS. Installation of an MCS confers arrester properties to the insulator without any deterioration of its insulating capacity. For this reason, application of MCIA on overhead lines makes shield wire redundant, while the height, weight, and cost of poles or towers goes down. At a lower overall cost and with a better lightning performance, such a line features a noticeably reduced number of lightning failures, cuts damage from undersupply of energy, and lowers maintenance costs. MCIAs hold much promise in protection of railway overhead contact systems against direct lightning strokes (DLS).

The base of multi-chamber arresters (MCA), including MCIA, is the MCS comprises a large

number of electrodes mounted on a silicon rubber length. Holes drilled between the electrodes and going through the length act as miniature gas discharge chambers. When a lightning overvoltage impulse is applied to the arrester it breaks down gaps between electrodes. Discharges between electrodes take place inside chambers of a very small volume; the resulting high pressure drives spark discharge channels between electrodes to the surface of the insulating body and hence outside, into the air around the arrester. A blow-out action and an elongation of inter-electrode channels lead to an increase of total resistance of all channels, i. e. that of the arrester, which limits the lightning overvoltage imp