Neutral Grounding Resistors
Product Details
Space heater.
Surge arrestor
Vacuum contactors
Load-break or load-less load switches
Current and/or Voltage transformers
Three phase transformer Wye / Delta type
Zigzag grounding transformer, dry type, air cooled
Terminal box for additional devices
Terminal box for I/O cables
Many optional features / equipments can be associated with the Neutral Grounding Resistors :
painted enclosures or as alternative mild galvanized, stainless steel
protection class from IP00, for indoor installations, to complete IP55 solutions for outdoor applications
insulation level from 1 kV to 132 kV
rating currents up to 10 kA
resistor elements in stamped stainless steel grids or edgewound technology
The main features and characteristics of the product are :
The resistors must absorb a great energy for very short time, few seconds, and as components of the security system they must assure a high reliability. For this reason it is fundamental design them optimizing the weight of active material (stainless steel) of the resistor elements according to the maximum acceptable heating overtemperatures.Each TELEMA Neutral Grounding Resistor is designed and manufactured to meet the technical specifications issued by the customer.
In many low and medium voltage systems, the system neutral may not be available. This is specifically true on Delta and ungrounded Wye Connected systems. To be able to ground these systems, grounding transformer (Zigzag or Wye-Delta type) can be used to create a neutral, which in turn can be connected to ground either directly, or more commonly, through a Neutral Grounding Resistor. These combinations are known as artificial neutrals and in each of them is possible to install a Neutral Grounding resistor.
to protect the conductors and the system equipments from overheating and mechanical stresses
to limit the damages to the electrical equipment, such as switchgear, transformers, cable and rotating machine and to prevent the extension of the fault with benefit also for the safety of the personnelto protect the conductors and the system equipments from overheating and mechanical stresses
- Country:Libyan Arab Jamahiriya
- telephone:218-39 02 83382 1
| The Neutral Grounding Resistors are generally employed in the LV and MV distribution networks to protect power transformers |
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