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Papers by Eng.Abdallah Reda

Research paper thumbnail of Multi-characteristic overcurrent relay of feeder protection for minimum tripping times and self-protection

Electrical Engineering, Dec 30, 2022

The main goal of this study is to propose new characteristics to an REF 615 model (overcurrent an... more The main goal of this study is to propose new characteristics to an REF 615 model (overcurrent and earth fault relay) that is used for feeder protection in an actual radial system of an Egyptian Substation. When studying fault current, both light and heavy loads as well as fault locations are considered based on the radial nature of the network. The proposed algorithm relies on simultaneously activating the three settings of REF 615 OC relay, with the three settings being set on the respective normal inverse (NI), very inverse (VI) and definite time (DMT) curves. The relay's operating area is divided into two areas. The VI curve functions as a backup for NI in the first area, whereas the NI curve functions as a backup for VI in the second area. The novelty of this study is the proposed model's ability to handle relay failure through its self-protection, which increases the network's protection level and minimizes the relay operating time by about 41.07% for rapid response to a fault. The presence of self-backup protection can minimize the coordination time interval between the main protection and backup protection (CTI) by about 77.98%. The ETAP software is used to investigate the actual radial system and in the analysis of the protection coordination.

Research paper thumbnail of Non Standard Overcurrent Relay for High Response with Self Backup Protection

Journal of Al-Azhar University Engineering Sector

The ABB REF 615 relay model is an overcurrent and earth fault relay used to protect the feeder of... more The ABB REF 615 relay model is an overcurrent and earth fault relay used to protect the feeder of the real radial system of 66/11 KV Egyptian Substation NO.7 in 10 th Ramadan. The main objective of this paper is to create non-standard characteristics in overcurrent relays to improve the response and to operate under its failing. In the proposed model, a combined setting is utilized and consists of NI and VI curves. The working area of overcurrent relay is divided into two areas. In the first area, the VI curve is operated as back up of NI curve and in the second area, the NI curve is operated as back up of VI curve. The simulation results are verified by ETAP software. The results prove that the developed model has two advantages. The first advantage is reducing the operating time by 40% over the conventional model. The second advantage is providing self back up protection in the relay and increases the protection level if any setting fails to operate.

Research paper thumbnail of Non Standard Overcurrent Relay for High Response with Self Backup Protection

Journal of Al-Azhar University Engineering Sector

The ABB REF 615 relay model is an overcurrent and earth fault relay used to protect the feeder of... more The ABB REF 615 relay model is an overcurrent and earth fault relay used to protect the feeder of the real radial system of 66/11 KV Egyptian Substation NO.7 in 10 th Ramadan. The main objective of this paper is to create non-standard characteristics in overcurrent relays to improve the response and to operate under its failing. In the proposed model, a combined setting is utilized and consists of NI and VI curves. The working area of overcurrent relay is divided into two areas. In the first area, the VI curve is operated as back up of NI curve and in the second area, the NI curve is operated as back up of VI curve. The simulation results are verified by ETAP software. The results prove that the developed model has two advantages. The first advantage is reducing the operating time by 40% over the conventional model. The second advantage is providing self back up protection in the relay and increases the protection level if any setting fails to operate.

Research paper thumbnail of Effect of non standard characteristics of overcurrent relay on protection coordination and maximizing overcurrent protection level in distribution network

Alexandria Engineering Journal

Research paper thumbnail of Investigation of The DGs Effect on The Coordination Between Protective Elements in Distribution Network

International Journal of Innovation Education and Research

Addition of Distributed Generators (DGs) to the electric network have more advantages to the netw... more Addition of Distributed Generators (DGs) to the electric network have more advantages to the network. It improves the voltage profile and the power flow in the network. In the last decade, DGs is used in power system, especially the distribution system. Coordination study for protective devices must be performed on the distribution network with DGs to reach selectivity with minimum clearance time of fault. Due to DG insertion to the electric system, the short circuit level is changed and coordination between protective elements should be done. This paper presents a technique to avoid the miscoordination problem between protective devices due to the impact of DG units insertion without any additional costs. The proposed technique depend on activating and updating the setting of network relays to achieve correct coordination. Also, it doesn't need any additional costs or any additional equipement to be installed in the electric network. This paper make studies on a real radial sys...

Research paper thumbnail of Investigation of The DGs Effect on The Coordination Between Protective Elements in Distribution Network

International Journal of Innovation Education and Research

Addition of Distributed Generators (DGs) to the electric network have more advantages to the netw... more Addition of Distributed Generators (DGs) to the electric network have more advantages to the network. It improves the voltage profile and the power flow in the network. In the last decade, DGs is used in power system, especially the distribution system. Coordination study for protective devices must be performed on the distribution network with DGs to reach selectivity with minimum clearance time of fault. Due to DG insertion to the electric system, the short circuit level is changed and coordination between protective elements should be done. This paper presents a technique to avoid the miscoordination problem between protective devices due to the impact of DG units insertion without any additional costs. The proposed technique depend on activating and updating the setting of network relays to achieve correct coordination. Also, it doesn't need any additional costs or any additional equipement to be installed in the electric network. This paper make studies on a real radial sys...

Research paper thumbnail of Multi-characteristic overcurrent relay of feeder protection for minimum tripping times and self-protection

Electrical Engineering, Dec 30, 2022

The main goal of this study is to propose new characteristics to an REF 615 model (overcurrent an... more The main goal of this study is to propose new characteristics to an REF 615 model (overcurrent and earth fault relay) that is used for feeder protection in an actual radial system of an Egyptian Substation. When studying fault current, both light and heavy loads as well as fault locations are considered based on the radial nature of the network. The proposed algorithm relies on simultaneously activating the three settings of REF 615 OC relay, with the three settings being set on the respective normal inverse (NI), very inverse (VI) and definite time (DMT) curves. The relay's operating area is divided into two areas. The VI curve functions as a backup for NI in the first area, whereas the NI curve functions as a backup for VI in the second area. The novelty of this study is the proposed model's ability to handle relay failure through its self-protection, which increases the network's protection level and minimizes the relay operating time by about 41.07% for rapid response to a fault. The presence of self-backup protection can minimize the coordination time interval between the main protection and backup protection (CTI) by about 77.98%. The ETAP software is used to investigate the actual radial system and in the analysis of the protection coordination.

Research paper thumbnail of Non Standard Overcurrent Relay for High Response with Self Backup Protection

Journal of Al-Azhar University Engineering Sector

The ABB REF 615 relay model is an overcurrent and earth fault relay used to protect the feeder of... more The ABB REF 615 relay model is an overcurrent and earth fault relay used to protect the feeder of the real radial system of 66/11 KV Egyptian Substation NO.7 in 10 th Ramadan. The main objective of this paper is to create non-standard characteristics in overcurrent relays to improve the response and to operate under its failing. In the proposed model, a combined setting is utilized and consists of NI and VI curves. The working area of overcurrent relay is divided into two areas. In the first area, the VI curve is operated as back up of NI curve and in the second area, the NI curve is operated as back up of VI curve. The simulation results are verified by ETAP software. The results prove that the developed model has two advantages. The first advantage is reducing the operating time by 40% over the conventional model. The second advantage is providing self back up protection in the relay and increases the protection level if any setting fails to operate.

Research paper thumbnail of Non Standard Overcurrent Relay for High Response with Self Backup Protection

Journal of Al-Azhar University Engineering Sector

The ABB REF 615 relay model is an overcurrent and earth fault relay used to protect the feeder of... more The ABB REF 615 relay model is an overcurrent and earth fault relay used to protect the feeder of the real radial system of 66/11 KV Egyptian Substation NO.7 in 10 th Ramadan. The main objective of this paper is to create non-standard characteristics in overcurrent relays to improve the response and to operate under its failing. In the proposed model, a combined setting is utilized and consists of NI and VI curves. The working area of overcurrent relay is divided into two areas. In the first area, the VI curve is operated as back up of NI curve and in the second area, the NI curve is operated as back up of VI curve. The simulation results are verified by ETAP software. The results prove that the developed model has two advantages. The first advantage is reducing the operating time by 40% over the conventional model. The second advantage is providing self back up protection in the relay and increases the protection level if any setting fails to operate.

Research paper thumbnail of Effect of non standard characteristics of overcurrent relay on protection coordination and maximizing overcurrent protection level in distribution network

Alexandria Engineering Journal

Research paper thumbnail of Investigation of The DGs Effect on The Coordination Between Protective Elements in Distribution Network

International Journal of Innovation Education and Research

Addition of Distributed Generators (DGs) to the electric network have more advantages to the netw... more Addition of Distributed Generators (DGs) to the electric network have more advantages to the network. It improves the voltage profile and the power flow in the network. In the last decade, DGs is used in power system, especially the distribution system. Coordination study for protective devices must be performed on the distribution network with DGs to reach selectivity with minimum clearance time of fault. Due to DG insertion to the electric system, the short circuit level is changed and coordination between protective elements should be done. This paper presents a technique to avoid the miscoordination problem between protective devices due to the impact of DG units insertion without any additional costs. The proposed technique depend on activating and updating the setting of network relays to achieve correct coordination. Also, it doesn't need any additional costs or any additional equipement to be installed in the electric network. This paper make studies on a real radial sys...

Research paper thumbnail of Investigation of The DGs Effect on The Coordination Between Protective Elements in Distribution Network

International Journal of Innovation Education and Research

Addition of Distributed Generators (DGs) to the electric network have more advantages to the netw... more Addition of Distributed Generators (DGs) to the electric network have more advantages to the network. It improves the voltage profile and the power flow in the network. In the last decade, DGs is used in power system, especially the distribution system. Coordination study for protective devices must be performed on the distribution network with DGs to reach selectivity with minimum clearance time of fault. Due to DG insertion to the electric system, the short circuit level is changed and coordination between protective elements should be done. This paper presents a technique to avoid the miscoordination problem between protective devices due to the impact of DG units insertion without any additional costs. The proposed technique depend on activating and updating the setting of network relays to achieve correct coordination. Also, it doesn't need any additional costs or any additional equipement to be installed in the electric network. This paper make studies on a real radial sys...