Protective Relaying. ▪ Primary Line Protection: Directional Comparison Unblocking Pilot Relaying over Power Line Carrier shall be provided via the existing numerical distance relay. This relaying system shall be set selective within the prescribed zones of protection based on system protection analysis. The relay will directly trip and block the closure of the breaker(s). The relay shall be of utility grade and meet Transmission Owner’s standards. Identical primary line protection will be installed for the second line connection. ▪ Secondary Line Protection: Line Current Differential Relaying over Digital Microwave channels will be provided via a microprocessor based current differential relay. This relay will be set to provide backup distance protection if the communications channels are lost and be selective within the prescribed zones of protection based on system protection analysis. The relay will directly trip and block the closure of the breaker(s). Identical secondary line protection will installed for the second line connection. ▪ Breaker Failure: Two independent primary and secondary breaker failure relaying systems provide redundant breaker failure protection. After a circuit breaker trip is initiated, the breaker failure relay will begin a countdown timer. If the circuit breaker fails to open within a specified period, then the breaker failure relay and its associated lockout relay will trip and block closure of an adjacent circuit breaker(s) and send direct transfer trip to the remote terminal station to isolate the stuck breaker. The relay shall be of utility grade and meet Transmission Owner’s standards. ▪ Transfer Trip: The breaker failure conditions at Transmission Owner terminals will be remotely tripped at the Xxxx Substation upon receiving direct transfer trip (DTT) signals from Xxxxxx and/or Plattsburgh substations. The breaker failure conditions at the Xxxx Substation will be remotely tripped at the Transmission Owner’s Terminal upon receiving DTT signals from the Xxxx Substation. The Phase II protection will be coordinated with the Xxxxxx Substation and the Plattsburgh Substation remote line relays.
Protective Relaying. Main Step-
Protective Relaying on the Inter-tie Circuit Breaker Generator shall be responsible for tripping their inter-tie breaker and/or their generator breaker within 0.3 seconds after the occurrence of a fault on the electric facilities serving their installation hereby removing their generator and isolating transformer as a source of fault current. Equipment shall be installed to trip Generator’s inter-tie breaker whenever the MSEDCL supply is de-energized. The inter-tie breaker shall be automatically locked out and prevented from being closed into a de-energized MSEDCL system or partially de-energized system (loss of one phase). A synchronism check relay that operates when the voltage and phase angle differences of two systems are within certain limits and thus allows the two systems to be paralleled. An under voltage and over voltage relay that operates on predetermined values of either under voltage or over voltage within a system. (This relay may be either a combination relay or two individual relays designed to provide both functions.) Grid disturbance relay. An over and under frequency relay that operated when the system frequency deviates from predetermined limits for a time greater than its preset value. A differential over current relay of percentage type. Local backup protection provided.
Protective Relaying. Primary Line Protection: Directional Comparison Unblocking Pilot Relaying over Power Line Carrier shall be provided via the existing numerical distance relay. This relaying system shall be set selective within the prescribed zones of protection based on system protection analysis. The relay will directly trip and block the closure of the breaker(s). The relay shall be of utility grade and meet Transmission Owner’s standards. Identical primary line protection will be installed for the second line connection. Secondary Line Protection: Line Current Differential Relaying over Digital Microwave channels will be provided via a microprocessor based current differential relay. This relay will be set to provide backup distance protection if the communications channels are lost and be selective within the prescribed zones of protection based on system protection analysis. The relay will directly trip and block the closure of the breaker(s). Identical secondary line protection will installed for the second line connection.
Protective Relaying. The selection and application of protective relays are discussed in the following paragraphs. These relays protect equipment in the Auxiliary Power Supply System, Generator Terminal System, Primary Power Supply System, Turbine-Generator System, and the electrical loads powered from these systems. -------------------------------------------------------------------------------- Proprietary Information Page 18 AES IRONWOOD CONTRACT FINAL ISSUE - OCTOBER 30, 19988 -------------------------------------------------------------------------------- 2x1 501G REFERENCE PLANT APPLICATION HANDBOOK -------------------------------------------------------------------------------- ELECTRICAL ENGINEERING DESIGN CRITERIA -------------------------------------------------------------------------------- The following general requirements apply to all protective relay applications:
Protective Relaying. Main Step-up Transformer Protection: The primary protective device is a high speed transformer current differential relay with backup phase and high-set instantaneous overcurrent protection. The secondary protective device provides high speed current differential and neutral overcurrent protection. Both the primary and secondary relays, which are Developer's Attachment Facilities, are located in the 230 kV Control Building, which is a Connecting Transmission Owner's Attachment Facility, described in Section II(A), Item A8 of this Appendix A. This transformer is equipped with sudden pressure protection, liquid low level protection, high oil/winding temperature protection, Xxxxxxxx gas accumulator, and high pressure relief.
Protective Relaying. All SPPCo. required protective relay equipment will be located within the Steamboat substation meter house. The following relays are required by SPPCo. to isolate faults between the Steamboat substation and Far West's facilities as well as to prevent Far West from islanding with a portion of SPPCo.'s system under abnormal system conditions:
Protective Relaying. SCHEMATICS Responsibility: POWER Deliverable(s): • Protective Relaying Schematic Diagrams Prepare the Protective Relaying Schematic Diagrams. Show the interconnections of the relaying and control circuits. Include relays, control switches, control contacts, SCADA RTU control and status connections, and DC panel interconnections. Show contact developments of the control switches and relays indicating the terminal connections and state of the contacts for each position. Prepare drawings for each line position or relay function. Incorporate a drawing-specific legend and notes. Assumption(s): • The existing protective relaying schematics will only be modified if equipment is being replaced or added. • Feeder protection will utilize a SEL-651R relay and use a 487B relay for 27kV differential protection. • Ground bus fault detection on the 25kV reclosers will utilize a SEL- 551 • 27kV Tie breaker will utilize a SEL-351S. • Transformer protection will utilize a SEL-487E and SEL-451 relay. • Capacitor Bank protection will include a SEL-487V relay.
Protective Relaying. 7.2.1 The Producer will Maintain those protective relays and controls associated with the Producer's Purchased Assets, including the #1 Step-up transformer and MOAB switch, which are located on the relay panels in the substation control house.
Protective Relaying. Mechanical Strength The electrical systems will be provided in accordance with the requirements as outlined in Schedule “A” of the Offer to Lease (Tenant’s Design Brief and Landlord’s Specifications) Electrical work will conform to the Canadian Electrical Code, Canada Labour Code Part IV and applicable Provincial and Municipal Codes and Regulations. Systems and equipment will be CSA approved. Electrical systems will comply with the Model National Energy Code of Canada for Buildings. Fire alarm stations, wall switches and other control and operating mechanisms and receptacles will be installed at heights in accordance with CAN/CSA-B651-95 Barrier Free Design Standards. Illumination Levels Lighting at desktop level (750 mm above floor level) in the Leased Premises and at floor level in all other areas will not be less than the maintained nominal luminance levels below. The arrangement of lighting fixtures will be such as to provide an illumination with uniformity of 0.8 (minimum / average = 0.8) over an open floor layout based on the base building drawings. The illumination levels will be determined using standard reflectances. Lux Area 450 Leased office space based on an open floor plate and standard reflectances. 300 Entrance foyers, elevator lobbies and storage space 150 Base building corridors, stairways and elevators 300 Base building washrooms 100 Parking entrances 50 Interior parking areas 30 Ground level exterior lighting 10 Exterior parking Lighting Fixtures Light fixtures will be 20 x 60 lay in fixtures complete with 2 x 32W T8 lamps and acrylic lens. In the event that base building light fixtures or lenses are not required by the Tenant, the Landlord shall provide a credit in respect of the labour costs for installation of same.
