Primary and backup protection
Short circuits, overloads, surges induced by lightning, and other forms of natural interference can all contribute to problems in high voltage transmissions. This disturbance has the potential to cause disruptions in the distribution of electricity as well as damage to the equipment used in the installation of electric power systems.
It is necessary to have a dependable protection system that is capable of immediately identifying the disturbance and is also capable of isolating impacted components of the system from other components that can still function normally.
On high-voltage transmission, distance relays have the capability of serving both as primary protection and as remote backup protection. While the overcurrent relay (OCR) and the ground fault relay (GFR) function as a local backup in the event that the distance relay stops working properly.
An investigation into the coordination of protective relays was carried out as part of this study.
Figure 1 – Power system Network
The investigation focused on the high-voltage transmission that links the Payakumbuh and oto Panjang substations.
Primary protection and backup protection were also investigated. Calculating the settings of the distance relay, which is used as primary protection, as well as the settings of the relays used for remote backup protection, and calculating the settings of the overcurrent and ground fault relays, which are used as local backup protection, is how coordination is accomplished.
Following the computation, we are able to determine the setting time for the ground fault relay, the overcurrent relay, and the distance relay. Within 0 seconds, the setting time was completed for the first zone of the distance relay. The second zone was completed within 0.4 seconds, and the third zone was completed within 1.2 seconds.
Figure 2 – Block Diagram Protection Transmission
When using the overcurrent relay and the ground fault relay, set the time delay to 1 second in areas where the value is greater than the value used in the second zone of the distance relay. It is possible to coordinate the use of the distance relay with the auto-reclose relay in order to automatically shut off the circuit breaker some time after a temporary disruption.
The default setting for that usage to autoreclose relay is for the dead time to be 1 second and the reclaim time to be 40 seconds.
It is possible for the quality of the distribution of electrical energy to be improved by the coordination of the distance relay with the auto-reclose relay.
| Title: | Protection coordination study on 150 kV HV transmission network by Zulkarnaini Zulkarnaini and Muhammad Rizki |
| Format: | |
| Size: | 620.7 KB |
| Pages: | 7 |
| Download: | Right here | Video Courses | Membership | Download Updates |
Suggested Reading – A comprehensive guide to correct calculation for transformer differential relay settings
A comprehensive guide to correct calculation for transformer differential relay settings
