Application WSL cage vision off circuit tap-switch with positive-negative regulating Functions and Application Type WSL off-circuit tap changers apply to single pole or three poles oil immersed transformers with the max. rated through current of 300A,600A,800A,1000A,1200A and highest voltage for equipment of 12 kV, 40.5kV,72.5 kV and 126kV. And the operating position is such: model A is 5 ; mode B is 11. The rated frequency is 50Hz~60Hz. 1 Normal service condition of the tap changer 1.1 The temperature of the transformer oil shall be less than 100, more than -25 1.2 The tap changer shall be kept in the place with ambient temperature from -25~+40, and the relative humidity shall be less than 85%. 1.3 Vertical inclination of the tap changer should not be over 2% when it is installed on the transformer. 1.4 The tap changer shall be operated in areas without any corrosive or explosive gases. The specification of the product is rated voltage 110kV(highest voltage for equipment 126kV) and below, rated current 2000A and below with various regulating methods can apply hand-operation and power-driven on the cover or side of the transformer. WSL Series off-circuit tap changer is used for oil-immersed transformer with on-load tap changer. It is usually of cage type structure. The switch transition type is variable with its inner structure. It has linear regulating , single-bridge stridden over connection, double-bridge stridden over connection, Y-Δ transition, series-parallel connected transition, positive or reverse regulation ate. This tape changer is classified into two type, one called tank head type, the other called bell covered type. The operation method can be classified into two type, one is handled on the tank head or to the grounding, the other is driven with motor, They are used for power transformer, rectification transformer or furnace transformer in following specification range, rated frequency with 50Hz or 60Hz,highest voltage for equipment with 40.5kV,72.5kV and 126kV,rated current with 250A-2000A.This type of tap changer can only be operated in transformer under non-energized condition. The WSL cage vision off circuit tap-switch with positive-negative regulating is used for oil-immersed off-load voltage-regulating transformer, with vertical and horizontal cage structure. According to different inner structures, the connection mode includes linear regulation, single bridging, twin bridging, Y-△ conversion, serial-parallel conversion, positive-negative regulation. Installation way can be tank-cover-type and bell-type. The tap changer can be widely applicable to power, rectification, furnace and other transformers with rated frequencies of 50Hz and 60Hz, rated voltages of 35kV, 66kV and 110 kV, and rated currents of 125A~2000A. This tap changer must be operated under off-circuit status of transformer Non-excitation tap switch applies to oil-immersed transformer with 50Hz or 60Hz of rated frequency. In case of no excitation in transformer (i.e. no winding is charged), the switch can be operated manually or electrically to change the tapping position and further to change the transformation ratio, and by this means, secondary voltage can be adjusted or stabilized. This type of tap changer is comprised by electric, drive me chanism, tap changer body and electric controller with two kinds of specifications standing-type and horizontal-type it is suitable for oil-immersed furnace transformer with rated voltage 40kV and below, rated current 630A and below, they must be working under non-energized condition, it can be operated by electric drive or handle drive. Feature Product features of round type electrical device: 1)Transformer cover's round installation opening is smaller and power balance, so its sealing function is better than that of the square's. 2)Reduce the complex components will make the structure more compact and enable high transmission reliability. 3)The round electric operator operates freely and steadily with high quality of gear shift and small noise. 4)Round series electrical device's voltage regulating can reach 30 grades and above which leave more space for transformer designing. It's superior to the others. 5)This patent round electrical switch is in simple structure, advanced function and lower costs. It is economical and safe! Structure This type off-circuit tap changer consists of gearing mechanism and body, gearing mechanism is on the head of the tap changer, which can be mounted onto top cover of transformer tank; while the body,structured as cage form and without oil compartment, can be mounted into transformer tank. Characteristics: (1) All gearing components are located inside the compartment above the flange, isolating from transformer. Gearing components features as compact structure, small size, good appearance and convenient for maintenance. Note: The gearing mechanism compartment on the tap changer head should be fully filled with transformer oil before putting into operation. (2) WSLV and WSLIV series off-circuit tap changer can be affiliated with HMWK-1 controller that can indicate the tap position and operate the tap changer manually by push button at control room. (3) Clip contact structure, good heat dissipation, reliable contact and strong ability to withstand short-circuit current. (4) Reliable operation is secured further by electrical and mechanical limit protection. (5) The control circuit of tap changer controller is interlocked with that of transformer, the power supply of controller is disconnected when transformer is energized, and therefore, ensuring tap changer could not operate in on-load condition. (6) It is only suitable for standard tank mounting. 1.1 It has independent operating mechanism, which connects with the switch body through operating rod. The operating rod shall be equipped at the time of transformer assembly. 1.2 Contact positioner is installed on the upper wall plate of regular switch body, and it can give you a strong hand feel at the time of tank cover installation and operation so that you can accurately locate the switch contact to the center, therefore, accuracy and reliability of installation and location are improved. Gear indicator is equipped on the positioner, and it indicates 1st gear, 2nd gear, 3rd gear...anticlockwise. There are identification numbers on leading wire, which will provide connivance to you for connecting tapping wire. 1.3 Movable contact is of ring rolling type and strong hand feels for operating, and can be back in place automatically (in case of no undue external resistance). It is generally at the medium gear (at the observation window of the insulating cylinder) when it leaves factory. 1.4 The shaft coupling is with big head (in the direction with high gear number) and small head. The big head and small head shall be respectively inserted into the big head and small head of operating rod notch. Elastic contact device is added on the shaft coupling of switch body, and tightly abuts upon the operating rod. By this means, the generation of floating potential is avoided, and discharge due to operation is eradicated. 1.5 Mechanical retainer is installed on the body positioner or on wall plate. Three-phase switch body is generally equipped with mechanical retainers, while regular 5-gear and 7-gear single-phase switches are not equipped with mechanical retainers so that they can rotate circularly. 1.6 Switch with built-in shielding applies to transformers with high partial discharge requirements and high-voltage transformers, and it can effectively reduce the volume of transformers. 2.1 The contact structure and drum switch are annular pure rolling contact structure, which absorbs the merits of drum switch, such as big working current, automatic arrival in place, small charged body, good stiffness, uniform electric-field distribution and so on. In combination with the structure of wiring terminal of cage switch, this product is developed to replace cage switch and has overcome the demerits of cage switch, such as bad stiffness, big volume, small current-carrying capacity, no operational feel and so on. 2.3 Flat-topped and bell type installation manners are mainly adopted for barrel switch. Switch control mechanism and the body are integral structure without riveting control lever, which makes the installation simpler and more convenient. Floor type installation can also be adopted with control lever for connection and the installation method is the same with drum switch. 3.1 Clip structure shall be adopted for moving contact and is hard to carry big current. Screw drive shall be adopted for the body. The gear shall be switched over after several revolutions (the rev olutions of different types shall be different and the instructions are on the hand grip of control mechanism). 3.2 The installation shall be carried out at Gear 1. The limit (joint end) shall be only set at Gear 1 for the body. Rotate clockwise the joint of switch body to the limit position as Gear 1 and at that time, the moving contact touches the Gear 1 position; remove the protective cover and observe, and when the moving contact stops at the two adjacent fixed contacts (when leaving the factory, the fixed contacts of switch have been labeled with tapping mark) which are close to the body joint, it is Gear 1. 3.3 Just as drum switch, independent control mechanism is adopted for strip switch. The switch body is connected through control lever which shall be prepared during general assembly of transformer. 4.1 The clip type structure is applicable to the switch with relatively small current. Circumferential rotation of moving contact will realize switchover of gears. In general, switchover of gears will happen after rotation of dozens of degrees. 4.2 Squirrel-cage structure is applicable to the switch with especially big current. The rotation of screw stem will drive moving contact to slide upward and downward axially, so as to realize switchover of gears. Parallel wiring terminal shall be set on fixed contact. 4.3 In general, flat-topped and bell type installation manners shall be adopted without riveting control lever, which makes installation simple and convenient. Drying 1.Open the top cover of tap changer 2. Drying procedure: under standard atmospheric pressure, heat up the tap changer at a temperature increasing rate of 10C per hour until 110C, and then keep drying with circulating hot air for 24 hours.