Testing is the evidence that a transformer meets its specification. Knowing which tests exist — and which ones you should ask for — puts you in control of quality before the unit reaches site.
This article explains the test categories and what each one proves.
Testing is the evidence that a transformer meets its specification. Knowing which tests exist — and which ones you should ask for — puts you in control of quality before the unit reaches site.
This article explains the test categories and what each one proves.
Winding resistance — Confirms conductor integrity and correct connections
Voltage ratio and vector group — Confirms the turns ratio and winding configuration
Impedance voltage and load loss — Confirms the design impedance and copper losses
No-load loss and no-load current — Confirms core performance
Dielectric routine tests — Applied voltage and induced voltage withstand
Insulation resistance — Basic condition check
Functional checks — Tap changer, protection devices, monitoring, cooling
Lightning impulse test — Proves BIL capability against surges
Temperature rise test — Proves the cooling design at rated load
Short-circuit withstand test — Proves mechanical strength under fault
Sound level measurement — For projects with a noise limit
FAT takes place at the manufacturer before dispatch. It can be witnessed by the customer or an appointed inspector. Ask for the test programme in advance and for certified reports afterwards.
On arrival and after installation: visual and transport damage check, insulation resistance, ratio and vector group, protection and monitoring function, earthing, and finally energisation and load monitoring.
Which routine tests are performed on every unit; which type test reports exist; whether witness testing is allowed; and the format and language of the test documentation.
Not sure which rating fits your project? Send us your load list and we will size it for you — or email info@xsdfftransformer.com, call +86 158 6789 7761 or WhatsApp +852 2416 2620.
Send us the rating, primary and secondary voltage, frequency and quantity and you get a drawing and a quotation back, usually within one working day.
