Dry reactor characteristics
1. Capacity range: Mostly used in small and medium-sized capacity scenarios ≤500kVA, such as 30kVA/30kV dry reactor (weight about 32kg) in search result 2 and 300kVA device in search result 3, all using dry pouring technology.
2. Advantages: small size, light weight, no leakage pollution (as described in 3 ()), suitable for mobile test or space limited occasions.
Heat dissipation limitation: Depending on the natural cooling of the air, long-term high current operation may affect the performance due to temperature rise.
Oil reactor features
1. Capacity range: Recommended for large-capacity scenarios with a capacity greater than 500kVA.
2. Advantages: Oil-immersed cooling can effectively dissipate heat and is suitable for fixed installation scenarios with high voltage and high current (such as the 135kVA test scheme, which requires higher voltage stability).
3. Disadvantages: large volume and weight, high maintenance costs.
Key selection basis
Capacity threshold
1. General recommendation: When the reactor capacity exceeds 500kVA, the oil reactor is preferred to meet the heat dissipation and insulation requirements
2. Exceptions: If the test time is short (such as intermittent work), installation space is limited or environmental requirements are high, the dry type can still be extended to a higher capacity (such as 108kVA dry design.
Environment and operating conditions
1. In high temperature, high altitude, or long time full load operation scenarios (such as the main transformer pressure test, the oil type is more reliable.
2. When frequent movement or outdoor testing is required (such as cable field testing), dry type is more flexible.
Capacity dividing line: 500kVA is the typical dividing line between dry and oil.
Decision process:
1. If the capacity is less than 500kVA and it does not need to be fully loaded for a long time, the dry type is preferred (it is economical and portable).
2. If the capacity is > 500kVA or high stability is required, choose the oil type (excellent heat dissipation and pressure resistance).