SF 6 Gas Insulated Automatic

Product catalog summary

Overview: The document describes the SF6 Gas Insulated Automatic Sectionalizing Switch designed for power distribution systems, specifically for use in 22.9kV-Y distribution systems with a load capacity below 8,000kVA. It is installed at branch points or service entrances to minimize damage and prevent fault expansion by isolating fault sections in cooperation with protection devices like circuit breakers and reclosers.

Main Functions and Characteristics:

Over-current Trip Function: Detects over-current and isolates the fault section, working with protection devices. Includes OCR Trip and OCGR Trip functions.
Over-current Lock and Charge Trip Function: Inhibits trip functions if fault current exceeds 800A. Operates charge trip function when no-voltage condition is detected.
Cold Load Pickup: Prevents malfunction due to inrush current during switch closing or when the line becomes live.
Line Current and Live Line Indication: Displays phase currents and line status via LCD and indicator lamps.
Easy Function Setting: Allows setting of pickup current and other parameters through the control box LCD menu.
Battery Discharge Prevention: Automatically breaks the circuit to prevent battery discharge when AC power is lost.

Construction and Components: The switch includes components such as the ETMFC50 sectionalizing control relay, battery, earth terminal, power and charger, battery test panel, and various connectors and indicators. It features a robust design with attention to safety and operational efficiency.

Ratings and Specifications:

Environmental Conditions: Operates between -25°C to 40°C and up to 1,000 meters altitude.
Electrical Ratings: Rated voltage of 25.8kV, rated current of 800A, and rated frequency of 50/60Hz.
Performance: Short time current rating of 12.5kA for 1 second, making current of 32.5kA peak, and breaking current of 630A.
Insulation and Withstand Voltage: Power frequency withstand voltage of 70kV for 1 minute and impulse withstand voltage of 170kV.
Standards Compliance: Meets IEEE and ANSI standards for electromagnetic interference and surge withstand capability.

Conclusion: The SF6 Gas Insulated Automatic Sectionalizing Switch is a critical component for enhancing the reliability and safety of power distribution systems, offering advanced features for fault detection, isolation, and operational monitoring.

Catalog excerpts

ENhanced TEChnology SF6 Gas Insulated Automatic Sectionalizing Switch for power distribution system

Open the catalog to page 1

SF6 Gas Insulated Automatic Sectionalizing Switch This is installed in the branch point of below load capacity 8,000kVA of multiple earth neutral system 22.9kV-Y distribution system or in the service entrance of consumer. When over load or fault is occurred, minimizes the damage and prevent the fault expansion by breaking or opening exactly the fault section with the cooperation of protection device (CB, Recloser). Easy operation status monitoring is possible by built-in load current indicator and live line status distinction function. ASS is used for frequent lighting place, industrial line...

Open the catalog to page 2

Power & charger Battery test panel Power TR Power connector Control connector AC 220V Earth terminal 25.8kV SF6 Gas Automatic Sectionalizing Switch Drawing Close handle SF6 GAS filling valve Rupture disk Sealing connector Name plate Pressure locking Earth terminal Open handle Handle locking Attention sticker Hanger Handle 36kV SF6 Gas Automatic Sectionalizing Switch Drawing 1524 400 Earth terminal Handle locking divice Hanger Handle Position indicator Name plate

Open the catalog to page 3

Rating and Specification ITEM Condition Ambient Temperature Rated short time current Rated making current (Asym) Rated breaking current Power frequency withstand voltage Impulse withstand voltage (1.2 50 ) Over current LOCK current Min. pickup current Cold Load Pickup Load switching Insulation method Control power 50 times or 24 hours operation at the fully charged battery External Power Power frequency withstand voltage Impulse withstand voltage Control box internal ambient Test Surge withstand capability ANSI/IEEE C37.90.1 EFT/BURST Test: 4 kV(2.5 Hz) Oscillatory SWC Test: 2.5 kV(1 MHz) Radiated...

Open the catalog to page 4

SF 6 Gas Insulated Automatic

SF 6 Gas Insulated Automatic

Catalog excerpts

All ENTEC ELECTRIC & ELECTRONIC CO.,LTD catalogs and technical brochures