Energy conservation by BEE standards


Energy conservation by BEE standards



Technical Specifications - Distribution Transformer

1. Scope

1.1 This standard specifies the requirements for participating in the pilot energy labelling scheme for oil immersed, naturally air cooled, three phase, and double wound non sealed type out door distribution transformer.

1.2 The referred Indian Standard are IS 1180 (part I) Out door type three- phase distribution transformers upto and including 200 kVA, 11 kV – specification, IS 2026 (part 2) Specifications of power transformers – for Temperature-rise and IS 2500 (part-I) -2000: Sampling Schemes indexed by Acceptance Quality Limit (AQL) for lot-by-lot inspection.

1.3 The standard ratings covered under the pilot energy labelling scheme is 16, 25, 63, 100, 160 and 200 kVA and non standard ratings from 16 kVA to 200 kVA.  



2. Schedule of Tests:

2.1 Method of Tests:  The testing code and procedure for distribution transformer would be as per IS 1180 (part 1): 1989 with all amendments as of date. The exception is conditions on limits of temperature rise. For the scheme the following would be used. Reduce the temperature rise limits of top oil and transformer winding from the existing IS 1180 (part 1): 1989 level of 450 C & 550 C to 350 C & 400 C.

2.2 Parameters to be tested: Parameters for initial testing the type test parameters set out in IS 1180 (part 1) and the same is reproduced below: a. Measurement of winding resistance [IS 2026 (part I):1977] b. Measurement of voltage ratio and check of voltage vector relationship [IS 2026 (part I):1977] c. Measurement of impedance voltage/short circuit impedance and load loss [IS 2026 (part I):1977] d. Measurement of no-load loss and current [IS 2026 (part I):1977] e. Measurement of insulation resistance [IS 2026 (part I):1977] f. Induced over-voltage withstand test [IS 2026 (part 3):1981] g. Separate-source voltage withstand test [IS 2026 (part 3):1981] h. Lightning impulse test [IS 2026 (part 3):1981] i. Temperature-rise test [IS 2026 (part 2):1977] j. Short-circuit test [IS 2026 (part I):1977] k. Air pressure test [IS 1180 (part 1): 1989] l. Permissible flux density and over fluxing [IS 1180 (part 1): 1989]





Revised Schedule dated 14th Aug 2007 2

Parameters for verification & challenge testing are as follows: a. Measurement of winding resistance [IS 2026 (part I):1977] b. Measurement of impedance voltage/short circuit impedance and load loss [IS 2026 (part I):1977] c. Measurement of no-load loss and current [IS 2026 (part I):1977] d. Temperature-rise test [IS 2026 (part 2):1977]



3. Tolerances:  No positive tolerance shall be allowed on the maximum losses displayed on the label for both 50% & 100% loading values.



4. Star rating plan: 

4.1 Basis: The existing efficiency or the loss standards are specified in IS 1180 (part 1). This standard defines load losses and no load losses separately. For the BEE labelling programme total losses at 50% and 100% load have been defined. The highest loss segment is defined as star 1 and lowest loss segment is defined as star 5. The existing IS 1180 (part 1) specification losses are the base case with star 1.The basis for star rating plan is as follows:



Case Basis of losses (Total at 50% Load Condition)

Base case Star 1 Current purchasing practice (IS 1180 (part 1)Max Losses)

Star 2 Some utility purchase specs like AP, NDPL

Star 3 Losses from TOC design (Moderate)

Star 4 Losses from lowest TOC design

Star 5 High efficiency design










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