Supplier Ngr 0.4~35 Kv Stainless Steel (Ngr) Neutral Grounding Resistance For Transformer
General product information
1.Operation Conditions1. Mostly applied outdoor in system of 50Hz and 60Hz
2. Max Altitude is 3500m. Because of high altitude and bad thermal discharging in plateau, please indicate in order if in this situation.
3. Ambient Temp is between -20?~+70? and relative humidity does not excess 95%.
4. Wind pressure does not excess 700Mpa (equivalent to 34m/s)
5. Earthquake intensity is less than 8 degree.
6. Thickness of ice coverage is less than 10mm
7. Air dusty grade is not higher than IV grade
8. No corrosive or explosive gas and conductive dust around installation site.
9. As the resistor is a heat generating component, it should be installed in place with some space left around, and be away from heat source.
2.Product Features
1.Adopted high quality imported stainless steel or domestic stainless steel electric heating metal material, the product operates safely and reliably with the advantages of high conductivity, high temperature coefficient, corrosion resistance, thermostability, good oxidation resistance, high tensile strength, resistance value stability and etc.
2.The device also could be applied in medium power distribution system. When transformer is angle-connected, independent grounding transformer could be installed with which the neutral point and resistance are connected.
3. Resistance value could be designed from 1ohm to 2000ohm and current from 1A to 2000A
4. The cabinet coould be installed indoor or outdoor. As the cabinet body is corrosion-resistent and of high protection grade, made from stainless steel plate or painted cold rolled steel plate.
5.The counting funciton could be added to the device, which records times of resistance grounding.
6. Isolated switch could be added which convenients examination and repairment and so does temp. or humidity controller.
7.Intelligent monitor is at customers' option, which could monitor un-balanced current of neutral point when resistance cabinet is in normal operation, temp. of resistance pannel, and temperature of inside cabinet, measure transient current and records grounding times when single-phase grounding happens, reserve communication interface which could send monitored and recorded to master-control room so as to let operating people get the information in the first time.
3.Notice for purchase
1. system rated voltage
2.short-time withstand current;
3. normal resistance;
4. with current transformer or not; transformation ratio, capacity and compound deviation of the current transformer;
5. method of wiring (optional): a. wire in from the top, and out at the bottom, b. wire in and out from the bottom, c. wire in and out from the side, d. wire in from the side and out at the bottom;
6. durable time for short-time withstand current;
7. material of resistance cabinet, protection grade of (IP), color code and installation site of the resistor cabinet;
8. with earthing record and temperature and humidity control equipment or not