断路器LW46-126~252
用途
LW46-126~252系列户外高压交流SF6断路器（配弹簧操动机构），系户外三相交流50Hz高压输变电设备，用于分合额定电流、故障电流或转换线路，实现对输变电系统的保护、控制及操作，可以进行三极分闸快速自动重合闸操作。
结构及特点
LW46-126断路器采用自能式灭弧原理，绪小了压气缸的直径和重量，减了操作功，从而可以配用弹簧动机构。每台断路器由装在同一横梁上的三个单极和一个弹簧机构组成，三极间为机械联动，弹簧操动机构安装在横梁下方的中间部位，电气控制系统置于机构箱内。单极上部为一个断口的灭弧室，中间为支柱瓷套，下部为用于密封及传动的拐臂盒。LW46-252型断路器采用混压式灭弧原理，每台断路器由三个独立的断路器单极组成，既可以进行分相操作，又可以实现三相电气联动操作。每个断路器单极包括断路器本体（由灭弧室和支柱组成）和液压操动机放组成，断路器本体安装在液压操动机构上方。
Description
The Santronics AC Sensor, Part # 3115, is the first and only UL listed AC voltage sensor to be manufactured 100% in the U.S.A. The AC Sensor is a hand-held device for determining the presence or absence of 50-600 volts AC in insulated wires, wall receptacles, fuses, junction boxes, switches, and other voltage carrying electrical systems. The AC Sensor determines defective grounds, reverse polarity, and induced voltage.
It is not necessary to disconnect the system in question because no contact is required for operation, and current flow is not necessary to locate voltage. Simply touch the plastic tip to a connection point or move it along an insulated wire. If AC voltage is present, the LED light in the tip will glow cherry red.
There is no ON/OFF switch, since switches can malfunction over time. As a result, the AC Sensor is always on and ready to use.
Benefits
Visual alert to locate voltages of 50-600V AC.
No electrical contact required.
Only uses two AAA 1.5V alkaline batteries (included).
No on/off switch - always ready to use.
Specifications
Description, Non-contact AC voltage sensor
Operating range, 50-600V AC
Barrel & cap composition, Injection molded hi-impact nonflammable ABS with 2200V dielectric at 60 Hz.
Tip composition, Injection molded PVC
Batteries, Two AAA alkaline cells
Operating temperature, -40ºC to +55ºC
Circuit board, Surface mounted components on FR substrate
Light source, High intensity LED
Weight, 40.6 grams with batteries
Dimensions, 5.75" long x 0.75" diameter
Breakdown voltage, > 4,000V ac
Interior conductor, Brass strip approximately 4.75" long
Operating Instructions
Always hold unit by its body. Keep fingers away from the tip. Remove the end cap to replace batteries.
Simply touch the plastic tip to a connection point or move it along an insulated wire. If AC voltage is present, the tip glow red. The tip will emit a steady glow in the presence of AC line voltage. It will flicker in the presence of static electricity.
Caution 1. Prior to each use, as a safely practice, always test the instrument on a known live circuit to verify proper operation. Treat your AC Sensor with care as you would any other test instrument. Clean Ultimate AC Sensor with damp cloth.
Caution 2. In testing indoor insulated cable where the fibrous filler becomes saturated with water, which is conductive, an electrical connection is formed between the filler and the ground circuit. The length of cable that has become wet is essentially shielded. If a voltage is present on a conductor in this cable, the electric field normally radiated by the voltage will be attenuated by this shielding, and the AC Sensor may not glow even though a voltage is present.
Always approach wet indoor insulated cable with utmost caution. NOT FOLLOWING THESE CAUTIONS MAY RESULT IN BODILY HARM. Cable of this type is specified for indoor use only. It will be subjected to immersion in water only in rare conditions such as flooding.
Defective Grounds: Electrical equipment that has a metal enclosure and is improperly grounded or has a detective ground will always result in the Sensor's tip emitting a steady red glow.
