feroresonance resistor
feroresonance resistor
(OP)
What would be the size of the ferro resonance resistor for PT 100VA, with 4200/69/69 V. The plant is 7.2KV with high resistance grounding
any assisstance is aprrecviated
any assisstance is aprrecviated






RE: feroresonance resistor
RE: feroresonance resistor
RE: feroresonance resistor
RE: feroresonance resistor
RE: feroresonance resistor
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: feroresonance resistor
Potential Transformer indoor use 15KV
Ratio 7200/1.73:120/1.73-120/1.73V
Accuracy Class 0.5 100VA
Type UCL-7
Manufactured by ARETECHE
RE: feroresonance resistor
RE: feroresonance resistor
RE: feroresonance resistor
For instance, if the thermal burden is 1000VA at 120V, then use approx. 14 ohms of resistance.
RE: feroresonance resistor
RE: feroresonance resistor
If you're in the IEEE world, accuracy burden will be a letter like 0.3 WXYZ and thermal burden will be spelled out in VA and labeled as such.
If you're in the IEC world, accuracy burden will be listed in VA after the class, i.e. Cl 0.5 - 100VA and thermal burden may or may not be on the nameplate.
From the voltages you listed, I assume IEEE world.
RE: feroresonance resistor
RE: feroresonance resistor
RE: feroresonance resistor
1,9 for systems not being solidly earthed.
1,5 for solidly earthed systems.
The saturation is specified to be 30 sec for systems with tripping earth fault protection and 8 hours if no Earth fault tripping protection is used.
The VT's must not be saturated at the voltage factor."
Does the factor here represents the overvoltage
RE: feroresonance resistor
RE: feroresonance resistor
Any comments
RE: feroresonance resistor
RE: feroresonance resistor
Do I correctly understand that under IEEE ratings this transformer is suitable for use on a solidly grounded 7200V system (wye voltage 4157V), but not suitable for a resistance grounded 7200V system where the voltage across the transformer under fault conditions may approach 7200V which is in excess of the maximum IEEE rating of 5000V.?
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: feroresonance resistor
RE: feroresonance resistor
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: feroresonance resistor