RL-Series pole mounted load break switch

Transcription

1 RL-Series pole mounted load break switch

2 Introduction and Features The RL-Series pole mounted gas insulated load break switch is available in manual and a remotely controlled switch. These switches provide the features of traditional load break switches, plus the benefits of an up to date design optimised for remote control. After carefully evaluating customers needs, the RL-Series gas insulated load break switch was developed to achieve optimum performance and reliability, making use of the latest in available technology in SF 6 arc interruption. The result is a competitive world-class product of which we are justly proud. By using this technologically advanced equipment, operating costs will be reduced, revenue will be increased through reduced outages and capital works can be deferred through better management of existing plant. Reduced Purchase Cost A modular design provides an easy upgrade path. It is possible to upgrade the basic manually operated model to a motorised remotely controlled switch. Reduced Installation Costs A cross arm mounting bracket is provided in the standard package. The 27kV model is supplied with a 400 amp insulated cable tail kit. Cables are not included with the 15kV bare terminal model. Reduced Operating Costs Long lifetime, low maintenance equipment reduces lifetime cost. Increased Revenue Supply can be quickly restored to unaffected areas, resulting in less outage time and therefore increased revenue. Deferred Capital Works Remotely controlled load break switches provide better system control. Feeder and substation load can then be remotely managed improving utilisation of existing plant. Purchase of new plant can then most likely be deferred for a considerable period of time. 2 RL-Series

3 Gas Insulated Switch Overview and Operation The RL-Series gas insulated pole mounted load break switch can be upgraded to an automated unit with communications. Modular design The switch is designed around puffer interrupters contained in a fully welded and sealed 316 grade stainless steel enclosure filled with SF 6 gas. The SF 6 gas as the insulating and arc quenching media together with the puffing principle ensure the positive breaking of small currents, mainly active load currents, cable charging current, magnetising current, etc. The extremely short arcing times (within half a cycle) plus tulip type contacts with arc resistant material ensure the long switching life and extended short circuit making capability. The interrupters are ganged together and driven by an over-centering spring mechanism. This is operated either manually or by a DC motor in a motor compartment below the tank. All switches are fitted with a manual operating arm that allows hookstick operation from ground level. By pulling on the appropriate side of the arm the load break switch can be tripped or closed. The mechanism is "operator independent" so that it does not matter how fast or slow the arm is moved by the operator. A motor mechanism is used in feeder automation schemes to facilitate remote control. The motor is fitted to the switch and its power is supplied from batteries installed in the pole mounted control and communications cubicle. This cubicle also houses the mechanism control and battery charging unit. A detachable control cable is used to connect the cubicle to the switch. The tulip contact with arc resistant material (Cu-W) ensures the long contact life and high short circuit making capability. Safe design In the event of an internal arc fault, a vent on the side of the load break switch ruptures to vent the over-pressure. This eliminates the risk of explosion or detachment from the power pole and since the unit is not oil filled, a major fire hazard is eliminated. Load Break Switch with optional motor A low pressure locking device locks the manual operating handle if the pressure drops below a pre-set threshold. Easy Installation SF 6 switch Motor Motor and Control is Optional Control Cubicle Mechanism control Battery charging unit RTU and modem High voltage connections are made with insulated cable terminated on epoxy bushings. The cable and bushings are covered by a gripping elastomeric boot that is filled with silicone grease to form an insulated system on the 27kV model. The 15kV model is provided with bare terminals instead of the covered assemblies. The switch is installed using the standard cross arm mounting bracket. Motor Option An optional motor pack can be purchased which then allows the switch to be interfaced to or third party control cubicles to provide local and/or remote control. RL-Series 3

4 Pole Mounting Details Surge Arresters always earthed to tank, even if mounted separately Surge Arrester Earth Stud Antenna (if fitted) earthed to tank Two M20 bolts for timber pole mounting (not supplied) or Motor Two clamp bands for concrete pole mounting (optional) Control Cable Main Earth Bond Tee Off User supplied Control Cubicle Control Cubicle Earth Earth stud Pole mounted installation showing the load break swithc with motorised remote control Note: 1. Details given in this illustration are subject to change without notice. For full details refer the separate Technical Manual. 4 RL-Series

5 Cable Terminations Factory fitted Bare Terminal Standard Lug Bare Terminal 15kV 630A Bushing Threaded End Silicone Grease Clamp Ring Boot Cable terminated with threaded end (630A) Palm factory fitted to bushing Standard Lug Silicone Grease Bushing Clamp Ring Boot Cable terminated with standard lug (250&400A) RL-Series 5

6 RL-Series specifications 15kV 15kV 27kV 27kV Ratings 12.5kA 16kA 12.5kA 16kA Maximum System Voltage kV 15kV 27kV 27kV Rated Continuous Current A 630A 630A 630A Fault Make Capacity (RMS) kA 16kA 12.5kA 16kA Fault Make Capacity (Peak) kA 40kA 31.5kA 40kA Mechanical Operations Rated Full Load Operations Short Time Current (4s RMS) kA 16kA 12.5kA 16kA Breaking Capacity Mainly Active (0.7pf) A 630A 630A 630A Cable Charging A 25A 25A 25A Transformer Magnetising A 22A 22A 22A Impulse Insulation Level Phase to Phase kV 125kV 150kV 150kV Phase to Earth kV 125kV 150kV 150kV Across Interrupter kV 145kV 170kV 170kV On Loss of SF kV 50kV 70kV 70kV Power Frequency Insulation Level Phase to Earth kV 40kV 60kV 60kV Across Interrupter kV 50kV 60kV 60kV Environmental Ambient Temperature to +50 C -30 to +50 C -30 to +50 C -30 to +50 C Radiation (Max) kW/m 2 1.1kW/m 2 1.1kW/m 2 1.1kW/m 2 Humidity to 100% 0 to 100% 0 to 100% 0 to 100% Altitude (Max) (1) m 3000m 3000m 3000m Net Weights Load break switch (2) kg 95kg 95kg 95kg Crate Dimensions Standard W=1200mm D=1150mm H=755mm 1 For altitudes above 1000m, derate in accordance with ANSI C For Gross Weights add 75kg 6 RL-Series

7 Ordering Information The RL-Series LBS ordering information comprises one part number. The load break switch part number includes a Model Identifier and fields describing the Automation Status, Insulation Medium, System Voltage, Fault Make Capacity, Insulation Level and Cable Rating. The part number does not include measurement units and is constructed using only one option per field in the selection chart below. A part number example is shown below: Nu-Lec-RL27-LBS-RC-SF Nu-Lec - RL27-LBS - - SF Field descriptions 1. Model: RL27 is the current model RL-Series LBS RL27-LBS RL27-LBS 2. Automation Status: MR = Manual, excl. motor RC = Remote, incl. motor MR RC MR RC 3. Insulation Medium: SF 6 gas insulated load break switch 4. System Voltage: 15 = 15kV, 27 = 27kV SF6 15 SF Fault Make Capacity: 12 = 12.5kA 16 = 16kA Insulation Level: = 125kV 150 = 150kV Cable Rating: 250 = 250A, 400 = 400A 630 = 630A 630-BT = 630A Bare Terminal (BT) (15kV max.) BT 15kV RL-Series 7

8 Distributor: Brochure Part Number: N CORPORATE OFFICE & FACTORY UK OFFICE USA OFFICE SOUTH AFRICA OFFICE South Street, Lytton, 4178 Queensland, Australia PO Box 761, Edith Street Wynnum, Queensland, 4178 Telephone (07) Intl Facsimile (07) Intl sales@nulec.com.au Unit 9, Kings Meadow Ferry Hinksey Road Oxford OX2 0DP United Kingdom Telephone (01865) Intl Facsimile (01865) Intl sales@nulec.co.uk Old Alpharetta Road Alpharetta, Georgia United States of America Telephone (770) Intl Facsimile (770) Intl sales@nulec.com Cnr. Bekker & Montrose Rds, Midrand, South Africa Postal address: Private Bag X139, Halfway House, 1685 Telephone (011) Intl Facsimile (011) Intl sales@nulec.co.za Copyright 2001 Pty Ltd. No responsibility for loss incurred by any person acting or refraining from action in reliance upon any material in this brochure can be accepted by Pty Ltd.