Common use of Requirements for Protection System Clause in Contracts

Requirements for Protection System. The Company shall provide a complete and comprehensive protection system for the generators/generator transformers/service transformers, transmission lines and the station electrical distribution systems at the power plant end. The Company shall undertake the installation of panels for control and protection system for transmission line at the PGCB end also with all necessary annunciations, Protective relays, auxiliary and tripping relays. Testing and commissioning of all equipments, control and Protection system at Power Plant end as well as PGCB end shall be carried out by the Power Plant Company. For line protection, following requirements need to be fulfilled: 1. As per standard practice for 132kV level, the line protection should be established by Main protection and Back-up protection schemes, implemented together. 2. Main Protection should be Distance Protection or Line Differential Protection based on IEEE Std C37.113-1999. 3. Distance protection relay should have at least three forward zones and one reverse zone with Switch On To Fault (SOTF) protection, VT failure, Power Swing Block (PSB) and Load Encroachment functions. The protective relays should be equipped with event recorder and fault recorder with capability of time synchronization. Differential relays should be connected with dedicated communication channel. 4. Fault level study needs to be performed and necessary steps has to be taken by the company in case of exceeding the Short Time Current rating of the existing switchyard equipment of the PGCB grid substation 5. All relay settings have to be calculated by the company and approved by BPDB/PGCB. Calculations of CT selection and earthing have to be approved by PGCB 6. Integration with existing SAS (if any), BBP (if any), DFDR (if any) with necessary supply, installation, testing and commissioning has to be performed by the company. 7. In power plant end, there should be separate bus bar arrangements and necessary switchgears have to be installed by the company. In power plant end, Line directly connected from the grid substation to the Generator step-up transformer would not be allowed. Synchronization has to be done in Generator circuit breaker. All DC signals including tripping, alarm, status etc. have to be connected between grid substation and power plant with control wire instead of optical fiber for a very short line. DC voltage drop between the substations has to be calculated by the company and necessary measures need to be taken to ensure healthy DC circuit. The inter-tripping of line differential relay should be provided through optical fiber cable. DC and AC supply for the extended power plant feeders have to be taken from separate spare MCBs and subjected for the approval of respective substation.

Requirements for Protection System. The Company shall provide a complete and comprehensive protection system for the generators/generator transformers/service transformers, transmission lines and the station electrical distribution systems at the power plant end. The Company shall undertake the installation of panels for control and protection system for transmission line at the PGCB end also with all necessary annunciations, Protective relays, auxiliary and tripping relays. Testing and commissioning of all equipments, control and Protection system at Power Plant end as well as PGCB end shall be carried out by the Power Plant Company. For line protection, following requirements need to be fulfilled: 1. As per standard practice for 132kV 33kV level, the line protection should be established by Main protection and Back-up protection schemes, implemented together. 2. Main Protection should be Distance Protection or Line Differential Protection based on IEEE Std C37.113-1999. 3. Distance protection relay should have at least three forward zones and one reverse zone with Switch On To Fault (SOTF) protection, VT failure, Power Swing Block (PSB) and Load Encroachment functions. The protective relays should be equipped with event recorder and fault recorder with capability of time synchronization. Differential relays should be connected with dedicated communication channel. 4. Fault level study needs to be performed and necessary steps has to be taken by the company in case of exceeding the Short Time Current rating of the existing switchyard equipment of the PGCB grid PGCB's substation. 5. All relay settings have to be calculated by the company and approved by BPDB/PGCB. Calculations of CT selection and earthing have to be approved by PGCB. 6. Integration with existing SAS (if any), BBP (if any), DFDR (if any) with necessary supply, installation, testing and commissioning has to be performed by the company. 7. In power plant end, there should be separate bus bar arrangements and necessary switchgears have to be installed by the company. In power plant end, Line directly connected from the grid substation to the Generator step-up transformer would not be allowed. Synchronization has to be done in Generator circuit breaker. 8. All DC signals including tripping, alarm, status etc. have to be connected between grid substation and power plant with control wire instead of optical fiber for a very short line. DC voltage drop between the substations has to be calculated by the company and necessary measures need to be taken to ensure healthy DC circuit. The inter-tripping of line differential relay should be provided through optical fiber cable. DC and AC supply for the extended power plant feeders have to be taken from separate spare MCBs and subjected for the approval of respective substation.

Requirements for Protection System. The Company shall provide a complete and comprehensive protection system for the generators/generator transformers/service transformers, transmission lines and the station electrical distribution systems at the power plant end. The Company shall undertake the installation of panels for control and protection system for transmission line at the PGCB end also with all necessary annunciations, Protective relays, auxiliary and tripping relays. Testing and commissioning of all equipments, control and Protection system at Power Plant end as well as PGCB end shall be carried out by the Power Plant Company. For line protection, following requirements need to be fulfilled: 1. As per standard practice for 132kV 33kV level, the line protection should be established by Main protection and Back-up protection schemes, implemented together. 2. Main Protection should be Distance Protection or Line Differential Protection based on IEEE Std C37.113-C37.113- 1999. 3. Distance protection relay should have at least three forward zones and one reverse zone with Switch On To Fault (SOTF) protection, VT failure, Power Swing Block (PSB) and Load Encroachment functions. The protective relays should be equipped with event recorder and fault recorder with capability of time synchronization. Differential relays should be connected with dedicated communication channel. 4. Fault level study needs to be performed and necessary steps has to be taken by the company in case of exceeding the Short Time Current rating of the existing switchyard equipment of the PGCB grid PGCB's substation. 5. All relay settings have to be calculated by the company and approved by BPDB/PGCB. Calculations of CT selection and earthing have to be approved by PGCB. 6. Integration with existing SAS (if any), BBP (if any), DFDR (if any) with necessary supply, installation, testing and commissioning has to be performed by the company. 7. In power plant end, there should be separate bus bar arrangements and necessary switchgears have to be installed by the company. In power plant end, Line directly connected from the grid substation to the Generator step-up transformer would not be allowed. Synchronization has to be done in Generator circuit breaker. 8. All DC signals including tripping, alarm, status etc. have to be connected between grid substation and power plant with control wire instead of optical fiber for a very short line. DC voltage drop between the substations has to be calculated by the company and necessary measures need to be taken to ensure healthy DC circuit. The inter-tripping of line differential relay should be provided through optical fiber cable. DC and AC supply for the extended power plant feeders have to be taken from separate spare MCBs and subjected for the approval of respective substation.