Horizontal double break disconnector Type edb, up to 420 kv Maximum reliability and minimal maintenance

Transcription

1 Horizontal double break disconnector Type edb, up to 420 kv Maximum reliability and minimal maintenance

2 Table of contents Disconnectors from ABB 2 Applications 2 Regulations 2 Maximum reliability and minimal maintenance 3 Technical data 4 Mode of operation 5 Easy installation 6 Main dimensions (mm) 6 Series Installation 7 Disconnectors from ABB ABB disconnectors have been in service across the world for over two decades providing maintenancefree service with the highest records of operational reliability. The worldwide experience, often under severe climatic conditions, is applied for continual product improvement. Applications A mechanical device for providing isolation of power equipment from the network, a disconnector is suitable for switching very small currents or where no significant change in voltage occurs across the terminals. The option of earthing sections of power systems can be made available by providing each disconnector pole with one or two earthing switches. Regulations The edb Disconnectors are designed as per IEC and IEC standards. Other international regulations can be met on request. Type tests on the disconnectors are carried out by accredited testing laboratories in accordance with the latest regulations. Comprehensive electrical and mechanical routine tests are carried out on the poles and operating mechanism of each disconnector ensuring world class quality. 2 Horizontal double break disconnector Product brochure

3 Maximum reliability and minimal maintenance Minimized contact resistance (energy efficient solution) The current carrying aluminum conductors have no joints to minimize circuit resistance. No external springs in contact fingers for maximum reliability The contact fingers of the moving contacts of disconnector type edb are designed from special conducting material and without external springs for increased reliability. Easy and quick erection The current carrying conductors and rotary pedestals are designed for easy adjusting and alignment. Low friction design for smooth operation Maintenancefree linkages with stainless steel rodend bearings require less drive power for operation and provide smooth motion transmission without any disturbance in the settings. (Corrosion free electrical and mechanical joints) Design based on cuttingedge technology and experience The horizontal double break disconnectors type edb consist of a steel base frame with one rotary pedestal, insulators, current carrying conductors (current path) and driving mechanisms. Steel components are hot dip galvanized to protect against atmospheric influences. Each of the three phases of the disconnector consists of one insulator mounted on maintenance free, sealed rotary pedestal and two support insulators which support terminal pads and fixed contacts which are carried by the steel base frame. The current transfer takes place between two stationary terminal pads. When closed, the contact fingers glides over the fixed contact which establishes connection between the highvoltage terminal pads. Flat terminal plates can be provided as per DIN standard 46203, NEMA or any other standards. Dead center interlocking for reliability under extreme conditions The dead center interlocking of operating mechanisms ensure that there are no inadvertent changes in the open or close switching position even under extreme external conditions such as storms, earthquakes etc. Superior design of mechanical interlock The mechanical interlock between the earthing switch and main blade is designed in a way such that there is no scope for malfunction. Ice breaking capacity The disconnectors are capable of operating under severe ice conditions. Fixed contact and terminal pad of 1600 A edb Strong rotary pedestals This ensures that the deflection remains unchanged at high mechanical loads. Suitable for wide range of environmental conditions The disconnectors can operate in a wide range of temperatures as well as under polluted environmental conditions. Minimal maintenance Superior material and lubricant used in the encapsulation of the pedestals makes the disconnectors practically maintenancefree. Product brochure Horizontal double break disconnector 3

4 Technical data Technical Data Voltage 72.5 kv * 123 kv 145 kv 170 kv 245 kv 300 kv 362 kv 420 kv Type designation edb72.5 edb123 edb145 edb170 edb245 edb300 edb362 edb420 Rated voltage (U r ) kv Rated frequency (f r ) Hz 50/60 Rated normal current (I r ) A 1600, 2500 Rated shorttime withstand current, rated duration of short circuit (I k,t k ) ka, s 40/50/63, 1*** Rated peak withstand current (I p ) kap 2.5x Ik (for 50 Hz) / 2.6x Ik (for 60 Hz) Basic Insulation Level Power frequency withstand voltage for 1 minute To earth and between poles Across the isolating distance Lightning impulse withstand voltage To earth and between poles Across the isolating distance Switching impulse withstand voltage To earth and between poles Across the isolating distance kv kv kvp kvp kvp kvp (+170) (+245) (+205) (+295) (+240) (+345) * 36 kv on demand ** Higher currents on request *** 3s for 40 ka 145 kv edb disconnector 4 Horizontal double break disconnector Product brochure

5 Mode of operation The disconnector and earthing switch are operated via independent operating mechanisms. The operating energy from the operating mechanism of the disconnector is transmitted via operating rod to the rotary pedestal. The three phases of the disconnector are connected by gang operating linkages for three phase operation. During opening and closing operation the current path, mounted on rotory insulator rotate through an angle of approximately 76. Operating mechanism All disconnectors can be supplied by manual or motor operated mechanism, as required by the customer. Each threepole disconnector or earthing switch group requires only one /individual operating mechanism(s). The coupling rods between the individual poles can be continuously adapted. Interlocks The disconnector and earthing switch (when supplied) are mechanically interlocked. In operating mechanisms a blocking magnet can be installed as an additional interlocking facility, which in disconnected condition, makes operation of the operating mechanism impossible. Earthing switch unit The earthing switch unit, an optional assembly, consists of a hingedtype earthing switch fixed at the base frame. The unit can be mounted on either of the contact sides or on both sides as required. In case of the earthing switch, the operating energy is transmitted to the earthing switch shaft. The tubular contact arm switngs upward when the unit is closing. Operating mechanisms contain auxiliary switches for control and signaling as well as provisions for electrical interlocks. Three phase operation is conducted via mechanical or electrical gang operation. For maximum reliability the main contacts of the disconnector and earthing switch pass through the dead center positions shortly before they reach the end positions. This prevents accidental opening or closing of the units due to external influences (e.g. shortcircuits, storm, earthquake). Bearing on frame assembly Linkages with spherical bearings Product brochure Horizontal double break disconnector 5

6 70 Easy installation The disconnectors are delivered in following assemblies lower part with rotary pedestals and operating rod, current path, support insulators and operating mechanism. As all mechanical adjustments are carried out in the factory, only mounting of the assemblies, installation of the coupling rods between the poles, connection of the hightension leads and the electrical connection leading to the operating mechanisms is required at the site. Stud bolts are provided to compensate rapidly and exactly any inaccuracies in insulator position caused due to tensile forces. A D C Pmin Pmin 70 E B Parallel installation Pmin Pmin Series installation Main dimensions in drawing (mm) Dimensions Voltage (kv) Type 72.5 edb edb edb edb edb edb edb edb420 A Support insulator distance (mm) B Base frame length (mm) C Insulator height (mm) D Disconnector height (mm) E Earth switch attachment length (mm) 375 max 375 max 375 max 400 max 400 max 400 max P Minimum distance between poles (mm) Parallel arrangement *) Series arrangement *) 6 Horizontal double break disconnector Product brochure

7 Notes Product brochure Horizontal double break disconnector 7

8 Contact us ABB India Limited High Voltage products Maneja, Vadodara , India Phone: Note: ABB Ltd is working continuously to improve the products. We therefore reserve the right to change designs, dimensions and data without prior notice. Public on 1HYD Copyright 2012 ABB. All rights reserved.