ABB 5STP24H2800 Power supply thyristor

Description

The control transformer, T2, is used for ASTAT control power, coils, radio remote controllers and other elec

tronic equipment. The commonly used sizes are 2 kVA -10 kVA (110 V) or 20 kVA (220 V). Transformers

smaller than 2 kVA are not recommended as the short circuit voltage might be too low with risk for non

satisfactory tripping conditions for MCBs and voltage drop for coils.

In the range 2 – 20 kVA a normal short circuit voltage is 4%.

The size in kVA is mainly given by the Pull-in power of the largest contactors that are energized at

the same time. Normally it is one of following factors that will decide the size of the transformer:

• Main contactor(s) of the crane
• Contactor of main hoist; if two motors are used for main hoist this should be considered
• Four contactors of a large four-corner crane travel motion

The holding power for contactors is small compared with Pull-in. Also the thermal power of ASTAT control

power, radio remote controllers and other electronic equipment is very small compared with Pull-in of con

tactors. Chose a transformer so the voltage drop is maximally 5% in the most critical situation.

ASTAT works in the way that no rotor contactors are pulled if the main contactor is not already pulled, and if

two rotor contactors for the same motor should be closed, there is a short time separation between the op

erations of the different contactor coils.

If the transformer size tends to grow larger than 10 / 20 kVA, DC-coils for the largest contactors will help to

reduce the size due to their lower Pull-in power in kVA.

Practically, the discussion above leads mostly to a selection of a 2 kVA transformer for cranes with a main

contactor of maximally 300 A.

Our products are widely used in CNC mechanical metallurgy, oil and gas, petrochemical industry,
Chemical industry, paper printing, textile printing and dyeing, machinery, electronic manufacturing, automobile manufacturing,
Plastic machinery, electricity, water conservancy, water treatment/environmental protection, municipal engineering, boiler heating, energy, power transmission and distribution.

.

Why are the prices of many products of our company more competitive?
(1) Source purchase to reduce the price difference in the intermediate phase
(2) Stable channel and more guaranteed supply
Lead time problem
(1) For the spot products in stock, the de

livery can be arranged on the same day after the contract payment is signed
(2) Order products and deliver according to the quoted delivery date
Xiamen Xiongba adheres to the enterprise philosophy of “improving the value of spare parts supply chain”,
For the simple purchase procedure of spare parts, ensure that they are delivered to the site in a timely manner, and help users reduce the risk of downtime caused by the shortage of spare parts
The emergency spare parts support service is complete, and the user can customize the spare parts. The quality of the spare parts is reliable. All the spare parts provided enjoy a one-year super long warranty
Spot stock, fast response, reduce user capital investment, improve spare parts utilization, spare parts replacement!

Details: If you need urgent delivery orders, please feel free to contact us, and we will try our best to meet your needs.
Price problem: If you find that other suppliers offer cheaper prices for the same product, we are also willing to provide you with reference prices and give you further discounts.
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Contact: Chen

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