DDY-3505 Self-boosting voltage transformer

Standard Voltage TransformerApplication: DDY-3505 series Standard Voltage Transf...

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Standard Voltage Transformer

Application: DDY-3505 series Standard Voltage Transformer is a test device used for measurements on high voltage1. It applies to all power transformers with a voltage rating of up to 765 kV2. Voltage transformers (VT), also called potential transformers (PT), are a parallel-connected type of instrument transformer3.

Features: PT of 110kV, Class0.05 which has high voltage class and high accuracy can be used to calibrate the PT 110kV/100V,110/ kV /100/V below class 0.2. It can calibrate the PT from 20% to 120% of the rated voltage. And it can be burdened with 0.25VA secondary load when the secondary voltage is 100V.

Specification:

Parameter	Specification
Rated Voltage Ratio	110 kV / 100V, 110/√3 kV / 100/√3
Rated Secondary Capacity	0.2 VA, 0.07 VA, 0.02 VA at Cosφ = 1.0
Accuracy Class	Class 0.05, Class 0.1
Accuracy Performance	- 80%-120% Un: Ratio error < ±0.02%, Phase error < ±0.6'
	- 50% Un: Ratio error < ±0.03%, Phase error < ±0.9'
	- 20% Un: Ratio error < ±0.04%, Phase error < ±1.2' (Actual error ≤ 60-70% of limit values)
Dielectric Withstand	Primary Winding: 1.2 kV AC for 1 min
Dielectric Withstand	Secondary Winding: 2 kV AC to earth for 1 min
Rated Frequency	50 Hz