مقدمه:

درسیستم ارتینگ نیروگاهی و دیزل ژنراتور که نیاز به یک سیستم ارت مطمئن و پایدار داریم مبحتی بنام سولاید گراندینگ مطرح میشود .

این سیستم بصورت چاه ارت عمقی و یا چاه ارت ماتریسی اجرا میگردد و مقاومت الکتریکی سیستم فوق بایستی پایین تر از ۲ اهم باشد.

در متن زیر توضیحات مفصل تری از این سیستم ارائه گردیده است.

General

A system is considered to be solidly grounded when its neutral is connected directly to a station ground or earth with no intentional impedance in that connection. Ground fault currents on solidly grounded systems are about equal to three-phase fault currents, and fuses or relays will operate satisfactorily. Where very high fault currents can occur, burning of the core iron may occur under short-circuit conditions.

Since motor circuits are very susceptible to ground faults, the impact of motor operation on system voltage is an important criterion for determining the method of grounding. Another important factor to consider is the method of ground relaying, if reduced ground fault current is desired.

Low-voltage systems (600 Volts and below) are usually solidly grounded (when grounded) because most low-voltage protective devices (circuit breakers and fuses) are phase-type devices, and require high currents to operate. New static devices do permit ground detection at much lower current values than phase trip devices. Low-voltage systems that use power circuit breakers can be relayed in a manner similar to high-voltage systems. Since low-voltage circuits are much more numerous, the increased cost of the additional equipment could be prohibitive, which is why phase-overcurrent clearing (fuse or circuit breaker) is usually employed when the system is solidly grounded.

• Solid Grounding