Supplier Power Distribution Equipment--20KV Neutral Earthing Resistors:
In distribution systems technique of neutral ground is usually categorized into neutral unground, neutral ground via resistor, and neutral-point grounding via arc suppression coil. Differnent grounding ways decide various operating ways. With development of economy , over-head line which is the main way of past power grid has been replaced by cable running line. Meanwhile, some new equipments such as hermetic compact structure of SF6 swichgear, twisted polyethylene cable and zinc oxide arrester are more and more widely applied. Therefore, non-effective grounding technique is unsuitable to present situation. As a result, to set neutral point grounding effectively is the important facet of power supply we should work on.
In distribution systems technique of neutral ground is usually categorized into neutral unground, neutral ground via resistor, and neutral-point grounding via arc suppression coil. Differnent grounding ways decide various operating ways. With development of economy , over-head line which is the main way of past power grid has been replaced by cable running line. Meanwhile, some new equipments such as hermetic compact structure of SF6 swichgear, twisted polyethylene cable and zinc oxide arrester are more and more widely applied. Therefore, non-effective grounding technique is unsuitable to present situation. As a result, to set neutral point grounding effectively is the important facet of power supply we should work on.
If neutral grounding resistance cabinet is installed, the current flowing through grounding point and neutral point would be much lower than than when metallicity grounding. Therefore, adopting neutral grounding via resistance could decrease transient overvoltage when single-phase grounding, and eliminate arc flash hazards like transient overvoltage and some resonant overvoltage associated with the first ground fault, and moreover it could adopt relays to quickly locate the fault circuit and clear it up.
Mingrui has outstanding technical researching team and superior equipments, specially concentrate on research & development, production, sales and service of neutral grounding series products of power distribution system. The transformer neutral grounding resistance cabinet we developed and produced is applicable to 6~35KV power distribution grid of cable running lines in cities, large industrial enterprises, factories, airports, seaports, subway and etc. as well as 0.66KV system in mine digging and 0.4kv/6kv/10kv system in power plants.
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.