class: center, middle # EE-361 # TRANSFORMER TESTS ## Open-Circuit, Short-Circuit Test ## Ozan Keysan [ozan.keysan.me](http://ozan.keysan.me) Office: C-113
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Tel: 210 7586 --- ## How to Test a Closed System? --
-- ### [Impact Test Siemens](https://www.youtube.com/watch?v=UfiabSc8w-U), [Modal Analysis](https://www.youtube.com/watch?v=Fn9xPMsrrBs) --- # How to Test a Linear Circuit? -- ## Open-Short Circuit Test for Thevenin-Norton Circuits --
--- # Procedure for Transformers -- - # Open Circuit (No-Load) Test -- - # Short Circuit Test --- # Open Circuit Test ## Secondary Side Open-Circuited (No Load)
--- # Open Circuit Equivalent Circuit  --- # Simplified (Approximate) Equivalent Circuit ## Open Circuit Test
--- # Simplified (Approximate) Equivalent Circuit ## Open Circuit Test
--- # Short Circuit Test
In short-circuit test applied voltage is much smaller than the rated voltage. ### \\(V\_1 \ll V\_{rated} \\) [What happens if you apply rated voltage at short-circuit?](https://www.youtube.com/watch?v=D8EQPx-ptKk) [Trafo Kısa Devre](https://www.youtube.com/watch?v=_Qh822feKZo), [Bursa trafo patlaması](http://www.olay.com.tr/bursa-da-trafo-patlamasi-panige-sebep-oldu/78434/) --- # Short Circuit Equivalent Circuit ### Neglect Parallel Branch! #### Current in the parallel branch is negligible due to small input voltage.
-- #### Series impedances can be calculated --- # Example --- # Example ## A 1000 VA, 230/115 V transformer has been tested from its primary winding: ## Find the equivalent circuit parameters. -- ## No-load Test: ### $$V_o = 230 V \quad I_o = 0.45 A \quad P_o = 30 W $$ --- #Example ## 1000 VA, 230/115 V transformer has been tested from its primary winding: ## Find the equivalent circuit parameters. ## Short Circuit Test: ### $$V_s = 13.2 V \quad I_s = 6 A \quad P_s = 20.1 W $$ --- ## You can download this presentation from: [keysan.me/ee361](http://keysan.me/ee361)