Product Description
Vacuum On-Load Tap Changers For Oil Immersed Transformers switch
CM2 OLTC
General
CM2 on load tap changer (Hereafter, referred to as OLTC) applies to power and rectification transformers with
highest voltage of 72.5kV,126kV,170kV and 252kV, maximum rated through current of 600A for three phases
and 1500A for single phases, to change the taps under load for the purpose of voltage regulation. Three phase
OLTCs are used at the neutral point of Y connection, and single phase OLTC can be used for any
connections.
CM2 OLTC is a typical OLTC of combined structure, consisting of diverter switch and tap selector.
CM2 on load tap changer is to be mounted to the transformer tank cover by its tap changer head which serves
also for connecting to the motor driver CMA7 or SHM-III via the worm gear box and bevel gear box to drive tap
change operation.
When CM2 OLTC is used without a change-over selector, the maximum operating positions available will be 18,
and 35 positions with a changeover selector. (special design is excluded).
This operation instructions includes all the necessary information for the installation and operation of CM2
OLTC. CM2 vacuum OLTC has the same overall dimension as CM type OLTC.
Type designation
The operating condition of OLTC
The temperature of oil under which the tap changer operates must not exceed 100ºC and not lower than
-25ºC .
The ambient temperature around the tap changer must not exceed 40ºC and not lower than -25ºC .
The non-perpendicularity of OLTC on the transformer against ground level should not exceed 2%
The space for mounting OLTC should be free from serious dust and other explosive and corrosive gases.
The mechanical life of OLTC should not be less than 1,500,000 operations.
The mechanical life of OLTC should not be less than 1,500,000 operations.
Mechanical operation principle of the tap changer
Tap change operation begins with the electric motor of the motor drive unit. The driving force is transferred to
the worm gear box on the top cover of the tap changer through driving shaft and belt pulley box,then the force
is actuated to the energy accumulating mechanism and the shaft which passes through the diverter switch sown
to the cylinder bottom.
There the cylinder bottom gear clutch is connected to the Geneva wheel mechanism of the tap selector. The
rotation of Geneva wheel makes the contacting bridge to rotate an angle corresponding to 1 step, thus the
connecting bridge will be connected to the desired tap of the tap winding without load.
Transportation of transformer together with the tap changer
When the tap changer is assembled to the transformer, careful consideration shall be given to the safety of
transportation (for example, to provide the temporary supporting). If the tap changer is immersed type, it is not
necessary to remove it for transportation. If there is trouble which requires to dismantle the motor drive unit, it
should be loosened at the setting position, so that it can be transported in the horizontal position. After arriving
on site, the motor drive unit can be re-installed according to above mentioned.
If the transformer is transported or stored without the conservator, then the bypass pipe (see Appendix 9)
supplied by our factory can be installed between the oil filling flange of the tap changer and the overflow pipe
flange of the transformer (the position of the flange is shown in the Appendix1), so that the static pressure
caused by the oil expansion can be balanced.
If transformer is required to be transported or stored without oil filling, then the oil in the oil compartment of the
diverter switch must be completely drained. The bypass pipe must be installed at that time so that the oil
compartment and the transformer oil tank will be subjected to the same pressure (nitrogen sealing).
In order to avoid damaging the tap changer caused by the displacement of moving parts, they must be
temporarily secured.
Note: The bypass pipe shall be removed from the tap changer head when the transformer is
installed onsite and before putting it into operation.
Packing
The tap changer and the motor drive unit are packaged separately for delivery after they have been conducted
routine test and set at the specified position.
Maintenance period
It is free maintenance for 300,000 operations.
Company Profile
Main product line: Tap changer and HV switchgear
Tap changer manufacturing with fullest vertical integration
Tap Changer Products Range On-Load Tap Changer:
* Conventional OLTC for transformer with voltage up to 765kV
*Vacuum OLTC for oil transformer with voltage up to 765kV
*Vacuum OLTC for dry transformer with voltage of 72.5kV
Off-Circuit Tap Changer
* Application for the transformer with voltage up to 765kV
Our Services
| 1. | Pre sale service |
| a. | make technical solution |
| b. | send quotation, technical data sheet and drawing |
| c. | prepare power transmission plan, testing plan and shipment plan |
| 2. | In sale service |
| a. | supervise the manufacturing schedule totally in accordance with the plan |
| b. | send photos to customer during every manufacturing process(hold point) |
| c. | inform the customer 1 week before testing. |
| 3. | After sale service |
| a. | installation and commissioning, training the workers |
| b. | quick response within 12 hours any time |
| c. | provide 12 months guarantee period normally. |
FAQ
| 1. Q: | What is your delivery time ? |
| A: | Depend on the type of transformer. |
| 2. Q: | What is your payment term? |
| A: | 30% advance by T/T , 70% before delivery by T/T or L/C or we can discuss about it. |
| 3. Q: | What kind of standard you follow? |
| A: | IEC, ANSI, CSA, GB, etc |
| 4. Q: | What kind of supporting documentation you can provide normally |
| A: | Quotation, outline drawing, manufacturing plan, quality control plan testing plan, financial report, type test report(KEMA, CESI),reference list, etc |
| 5. Q: | What is your normal warranty period? |
| A: | 12 months after transformer operation. |
| 6. Q: | Can u do installation and commission in user’s site? |
| A: | Yes, we can send our installation team to user’s country for service. |
| 7. Q: | Do you have any experience in this kind of transformer? |
| A: | Yes, we can provide reference list for check. |
Our advantages:
Quality Assurance
–From the very beginning, VILLE ensures quality in every step to achieve the best quality.
Experience Sharing
–With more than 30 years’ experience in power industry, VILLE brings you an optimized solution.
Global Service
–Wherever you are, VILLE global network will support and provide you with value.
Quick Response
–In response to your needs without delay, VILLE knows the value of your time.
Thanks for choosing VILLE as your reliable partner and
please trust both of us will create a brilliant future!
Pulley Type
There are several types of pulleys. These include fixed pulleys, load multipliers and movable pulleys. Below is a description of each pulley type. A load multiplier is a special type of pulley with multiple wheels for increased lifting capacity. It is used in a wide range of applications including power transmission and construction. Some common uses of pulleys are listed below.
moving pulley
Movable pulleys work by transferring the weight of a load to another object of the same mass. Since a live pulley is inherently frictionless and weightless, the force required to lift a load with it is the same as the weight of the load. This principle applies to tall buildings and residences. It is an excellent choice for lifting heavy objects such as furniture and washing machines.
A pulley is a mechanical device with a wheel that rotates on a shaft. The axle is attached to the wheel and is usually fixed. The movable pulley can be fixed or movable, both of which can change the direction of the force on the rope. Some pulleys can also change the magnitude and direction of the force. They are ideal for a variety of applications, from lifting heavy objects to transporting objects.
Another type of movable pulley works by transmitting force to another object. It has a free axis and the total force provided by the rope tension is balanced. Since the tension on the rope is constant in each segment, pulling 1 end of the rope will double the force on the shaft, resulting in 2 mechanical advantages. This mechanical advantage is the main reason why movable pulleys are so versatile.
Another form of moving pulley is called a KWL diagram. The KWL diagram summarizes the basic concepts of the drive wheel. KWL diagrams are an excellent way to assess a student’s understanding of the concepts discussed in the course. Word questions are a great way to check whether students understand concepts. When students answer the word questions correctly, the answer is yes!
Fixed wheel pulley
If you need to move heavy objects, a single fixed wheel pulley is not a good choice. Using a single fixed pulley might be similar to using a handbag, but it’s not very convenient. This type of pulley system relies on friction to transmit motion. As a result, it can slip and isn’t always reliable. Fortunately, you can find other options that work just as well.
Fixed pulleys are the most basic type of pulley. They consist of grooved wheels and ropes attached to objects. These pulleys make lifting easier. Because the rope or cable only moves in 1 direction, the movement of the object feels lighter. And they are also easy to install. However, before you buy a fixed wheel pulley, make sure it is strong enough to support the weight of the load.
The disadvantages of fixed pulleys are obvious. One of them is the lack of mechanical advantage. A fixed pulley pulls up with the same force as a single moving pulley, and a single fixed pulley is not particularly effective as a force multiplier. However, the effect is more pronounced when you combine multiple fixed-wheel pulleys. You will get double the power! So what do fixed wheel pulleys have to offer?
Fixed wheel pulleys can be as small as a ring. A single ring pulley requires twice as much force as the weight being pulled. Adding more loops to the rope will reduce the effort required to pull the weight. The mechanical advantage of a fixed pulley is proportional to the number of strands running to the free pulley. A 100-pound pull on the free end will lift a 300-pound load.
composite pulley
Compound pulleys are pulleys that can be used to change the direction of a control wire. It can also be used to modify the mechanical force of the wire by moving the item it is connected to. In galleons, compound pulleys are more common. They are often combined with other ropes for mechanical advantage. Here are some common uses for composite pulleys.
The ideal mechanical advantage of a pulley is equal to the number of rope segments that pull up the load. This means that the more rope segments, the less force is required. A compound pulley will have the ideal mechanical advantage of 2, which means it will generate more force than a simple pulley. Composite pulleys are also more efficient at transmitting force because their number of rope segments is usually equal to the unit weight.
Composite pulley systems use more than 2 pulleys and ropes. More pulleys will reduce the force required to move heavier objects. They are usually used in large sailboats. The system is also used on construction sites. It can be used for a variety of applications, including lifting large objects or transmitting electricity. You can imagine how it would change your life if you had to move a large sailboat, but the result would be the same: a composite pulley system would make it easier to lift a large sailboat.
Composite pulleys are also known as fixed pulleys. The fixed pulley is stationary, and the movable pulley moves back and forth. The latter is more effective when used with a detachable cord or strap. On the other hand, a moving pulley is a moving pulley and it gives you a mechanical advantage. You can imagine this pulley on a flagpole.
load multiplier
The multiplication system has 3 basic parts: the rope grab, the connector, and the pulley. While some basic multipliers may combine the 3 parts, the concept remains the same. The multiplication system can make pulling the rope easier by reducing the amount of friction that occurs. Below are some examples of multiplication systems. A compact rope grab is a great option for resetting the multiplier.
The load reduction that a pulley system can achieve is proportional to the number of ropes used to support it. Although most utility pulley systems use only 4 ropes, the theoretical maximum load reduction is a quarter of the actual load. In other words, the four-wheel system only reduces the weight of a 1,000-pound load by a quarter. That would require 167 pounds of force, a far cry from the 500-pound load a single pulley system can achieve.
The mechanical advantage of a pulley system can be calculated by calculating the ratio between the forces exerted on each wire. For example, a 90-kilogram load is supported by 3 ropes, each weighing about 30-5 pounds. The ropes on pulleys A and B each carry a load of 60 kg. Using this formula, a single pulley system will yield a mechanical advantage over 2 tractors.
To calculate the force required to pull the rope over the pulley, measure the angle and deflection between the ropes. The deflection angle when added to the included angle should equal 180 degrees. A 75 degree angle requires 159% of the load force. This means a total load multiplier of four. This formula is an important tool for calculating the force multiple of the pulley.
Disadvantages of fixed pulleys
There are 2 basic types of pulleys: movable and fixed. Active pulleys are more advanced, allowing the pulley to move according to the load. They reduce the force required to lift the load. Active roller pulleys are more compact and therefore take up less space. Both types are good for lifting heavier objects, but they each have their pros and cons.
Fixed wheel pulleys can be used to lift heavy objects. This type of pulley consists of a wheel with a fixed shaft that has grooves on its edges for guiding ropes or cables. This is a simple machine as no motor or engine is required to lift objects. When 2 or more wheels are used together, the ropes around the wheels form a powerful hoist.
Single wheel pulleys are not suitable for lifting. They tend to push things down. Also, they are unreliable because they rely on friction and can slip. Also, a single wheel pulley would require a lot of space. Another disadvantage of fixed-wheel pulleys is that they make it difficult to move heavy objects easily. Single fixed-wheel pulleys also tend to slip easily, making them a poor choice for many applications.
Fixed wheel pulleys are also easier to install and maintain than manually operated ones. It requires less space and lubrication than manual pulleys. Manual pulleys can cause injury because the operator will be lifting the full weight of the heavy object. Additionally, rope slippage can lead to muscle strains and rope burns. And the system requires frequent maintenance.
