11Maintenance and maintenance of lighting equipment and combination use of cable TV night repairs â–¡ Xu fé”´ (Tongshan County Broadcasting and Television Bureau, Tongshan 221116, Jiangsu) The lighting equipment required for night repair is divided into the following four types: car searchlights, hand-held searchlights , field lights, headlights, below analyze their use, usage and advantages and disadvantages.
1 The vehicle searchlight can be divided into three types: bolt type connection, magnet type connection and suction cup type connection from the connection with the vehicle body. It can be divided into three types: manual, wireless remote control and wired remote control. The luminous intensity is 10~100,000 Cd. The wireless remote control distance is 60~200m. The general free rotation 440 can be tilted by 120. It can prevent rain and can withstand very high or very low temperature. If it is matched with CCD, it can enjoy wireless all day and night. Left and right remote view.
Uses: The engineering vehicle travels along the faulty line and aligns the searchlight with the line, searches with the vehicle to move, and determines the point of failure to perform fixed-point illumination.
Usage: Manual mode requires a maintenanceman to always search the searchlights in the exposed car to adjust the angle. The remote control only needs to press the button on the remote control in the car to adjust the direction of the searchlight, making the maintenance staff safer. Convenient and comfortable.
Advantages: long range, high brightness, as long as the car does not turn off the fire can work without interruption, can rotate at a large angle in the pitch direction and horizontal direction.
Wireless remote control, wired remote control car searchlights legend 2 field lights are generally composed of generators, tow trays, tow boards, lifting tripods, wide-angle lamps, news lights and other supporting components.
Uses: For high brightness, wide angle, on-site lighting, can be replaced by car searchlights in general night maintenance.
Usage: Arrive at the fault site, fix the field lamp bracket, adjust the angle, and turn on the dedicated generator.
Advantages: wide illumination range, high brightness, easy to construct for a long time in the wide angle range.
Disadvantages: special generator is needed, it is inconvenient to move frequently, and it is not necessary to use it when it is generally faulty.
From the nature of the power supply can be divided into lead-acid batteries, nickel-cadmium batteries, nickel-hydrogen batteries, lithium batteries and so on.
The connection between the lamp cap and the power supply box can be divided into an integrated type and a split type (some integrated lights can also be connected to the standby power supply box).
General meters use halogen bulbs, the luminous intensity is above 1 million Cd, some high-grade lamps use ultra-high pressure ball-type xenon lamps or quartz bulbs, high-precision electroplating pure platinum nickel parabolic mirrors, the maximum intensity of the concentrated 6 million Cd irradiation distance is more than 1km , no medium interference space up to 3km, with focus, stroboscopic, strong function, using pulse dimming technology glare, work light free conversion.
There are also some types of lamps that can work normally and safely in a variety of flammable and explosive places and under 100 meters of water. Its outer casing is made of high-hardness alloy material, which is extremely resistant to strong impact and impact.
In addition, for the convenience of work, the handheld searchlights are usually installed in special product boxes, including: belt or shoulder type mobile battery, battery cable, charger, car cigarette lighter power cord, orange and yellow Fog mirror, focusing wrench, instruction manual and other accessories and supplies (depending on the type of lamp) Use: When the engineering vehicle is inaccessible, the vehicle lamp is not exposed, such as complex terrain fault site, unit, mobile search failure source .
Usage: It can be carried by hand, hand, shoulder, etc. The direction of the light and the direction of the eye are always consistent. After finding and approaching the suspicious point, it needs to be used together with the headlights. Put down the hand-held searchlight and switch to the headlights to liberate. The hand is checked for faults and the handheld searchlight can be turned off at this time.
Advantages: long range, high brightness and portability.
The 4 headlights are essential equipment for night repairs, and there are many types.
From the nature of the power supply can be divided into lead-acid batteries, nickel-cadmium batteries, nickel-hydrogen batteries, lithium batteries, alkaline batteries, etc., from the lamp and power box connection can be divided into one-piece and split.
The batteries used in the headlights are mainly: alkaline batteries: This is the most commonly used battery. Its power is higher than that of lead batteries, but it cannot be charged. It is only 10%~20% of power at low temperatures.
Lithium battery: It is twice as high as normal battery power, and its voltage is constant at low temperature and high temperature, especially at high altitudes.
Although the lamp headlights using the lead-acid battery as the power source have long illumination time, the quality is large and the volume is large, which is inconvenient to use during the repair, especially when climbing the air for aerial work, which is not discussed below.
A small number of headlights are waterproof or even water-resistant. If there is waterproof need, use such waterproof bulbs; use adjustable focal length headlights to expand the range of light exposure with diffuse light, or adjust to a single beam of direct light to make the light shine. farther.
Micro headlights: The advantage is light weight, the battery-free weight is only 100g, it has rainproof function, and the focus is 10~30m. Its switch and focusing system are integrated (Zoom and Megabelt are also the same) The rear seat of the headlight is equipped with a spare bulb.
Zoom headlights: This is the most versatile headlight in the world. It can last for 9.5 hours. It needs to be equipped with 3 5th battery packs on the headband and placed behind the head so that it won't be tilted forward. Cause the headlights to fall down.
Megabelt headlights: This is a headlight that is especially suitable for use in winter or alpine regions. In the alpine region, the efficiency of the battery will be greatly reduced. In order to improve the working efficiency of the headlight, it is first necessary to keep the battery working at normal temperature. The biggest feature of this headlight is that its battery case can be removed from the headband, stuck at the waist or placed in the arms, so that the headlights can work normally even at low temperatures.
Duo headlight: This is a double headlight. The high beam head can adjust the focal length. The farthest effective illumination distance is 100m. The low beam head is brighter. Because it can be stuck on the helmet, it is suitable for wearing a helmet. Used occasions. Its battery case is crimped and therefore has a 50m waterproof performance. The 4th No. 5 battery can be used for 3h when using the high beam, and the low beam can be used for 12h. There are two switches on the headlight, one for the combination of the various types of lamps to be repaired at night.
Table 1 Combination of various types of lamps during nighttime repairs Use of faulty locations Vehicle searchlights Field lights Handheld searchlights Headlights Engineering vehicles search for faults along the line to search for faults directly to the fault point; fault site lighting faults on-site lighting (optional) auxiliary search lighting; Auxiliary on-site lighting close-range lighting; maintenance lighting on the complex terrain line to search for fault points after finding the fault point, the engineering vehicle can be close to the fault scene lighting (optional) to search for lighting; auxiliary scene lighting close-range lighting; maintenance lighting can not be found after the fault point Close to search lighting; on-site lighting close-range lighting; maintenance lighting to turn on the power, and another to adjust the focal length, very convenient to use.
Saxo headlight: This is a dual-purpose headlight. Its curved handle design can be used not only as a normal headlight, but also on a helmet. It can also be used as a normal flashlight. The SaxoAqua diving headlight is Saxo's sister model, a completely waterproof headlight that will play a huge role in inclement weather. Its unique Xenon white light bulb makes it emit strong light, and the effective illumination distance can reach 50m. The 4th battery can be used continuously for 9h. Its switch has a locking function to prevent accidental opening of the headlight, thus saving battery.
Tikka headlights: It has the simplest design and the lightest weight (70g with 3 batteries on the 7th). It can be continuously illuminated for 150h. The illumination distance of the first 12h is 5m, and the illumination distance of 12~24h is 2m, 24~150h. The illumination distance is 1m. This excellent performance depends on its LED light bulb (LED). It is not only brighter than ordinary light bulbs, but also more power-saving and safer. It is especially suitable for close-range maintenance. Because its bulb is not an ordinary tungsten lamp, there is no possibility of burning the bulb. It is light in weight and unlikely to break.
Zipka headlight: It breaks through the traditional strap-on design, adopts elastic telescopic chain design, can be wrapped around the head, wrist, back of the hand, etc., can also be fixed on other objects, more convenient to use, for close distance Check the fault with your hands with other tools. When repairing, it is easy to use on the ground as well as the ladder in the air. Connected to the head by an adjustable elastic headband, the lamp head is placed in the middle of the forehead, and the pitch angle can be adjusted by hand so that the direction of illumination and the line of sight are easy to free the hands to work. The advantage is that the light weight (except the miner's lamp) is worn on the forehead, and the direction of the illumination is consistent with the direction of the head rotation, liberating the hands, facilitating more efficient and safer work, the disadvantage is that the range is not far, and the battery life is limited.
When repairing, you will encounter bad weather, so the car searchlights must be waterproof and explosion-proof. The waterproofness of other lighting equipment should not be ignored. The price of good equipment is naturally high, and it can be gradually configured according to economic conditions.
Simple family front end â–¡ Chang Junliang (Ji County Broadcasting and Television Bureau, Henan Hebi 456250) frequency input jack to connect the audio and video output of the digital satellite receiver to the audio and video input jack of the TV AV2 to connect the audio and video output of the digital set-top box To the audio and video input jack of the TV AV3, the cable signal is split into two channels by two splitters, one for the input of the digital set top box and the other for the antenna input of the TV set.
3 Debugging Press the AV button. When the AV1 day is displayed on the TV screen, press the AV button again for the VCD or DVD signal. At this time, the TV will switch to the AV2 signal source and the TV screen will be displayed as the digital satellite receiver. The signal presses the AV button for the third time, and the signal output from the digital set-top box is pressed for the fourth time. The TV is converted to the TV function, and the TV screen is displayed as a cable TV signal.
First connect the VCD or DVD audio and video output to the AV1 audio and video of the TV.
FGI `s Dry type Transformers` materials are of high quality, scientific formula, and adopt advanced production testing equipment to produce according to strict process. FGI `s Dry Type Transformer has the characteristics of high reliability and long service life. Depending on the environment, different enclosures can be configured. It can be used as an upgraded product for dry transformer with low loss, low noise, obvious energy saving effect and free maintenance.
FGI `s distribution transformers have the characteristics of low empty load loss and low operating cost. The positioning and connection of the body is firm, so the effective protection of distribution transformer is greatly enhanced. The overall structure is superior, the Electrical performance is good, and the product reliability is high. The National Transformer Quality Supervision and Inspection Center passed all the tests for FGI `s electricity transformers including short-circuit withstand capability. The type of transformer contains oil immersed power transformer and dry type transformer.
Transformers
Dry Type Transformer,200 Kva,50 Kva,500 Kva Dry Transformer,Dry,Electrical,Power Distribution Transformer,Abb,Distribution Transformers Connections
FGI SCIENCE AND TECHNOLOGY CO., LTD , https://www.fgi-tech.com