Technical Specification for LV Automation Applied to LV Engine Trail Sites
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Technical Specification for LV Automation applied to LV Engine trail sites 1. SCOPE This document defines the technical and functional requirements of the LV Automation and protection deployed in LV Engine project. This document covers the controllable circuit breakers at secondary substations and controllable switches deployed at link boxes and link pillars used on low voltage underground cable networks. It should be noted that the requirements specified in this document can be used for any LV Automation implementation excluding sections specific to LV Engine. This technical specification document has been prepared as part of the LV Engine project and utilises previous learnings generated from LV automation schemes trial by other DNOs. 2. Disclaimer Neither SPEN, nor any person acting on its behalf, makes any warranty, representation, undertaking or assurance express or implied, with respect to the use of any learnings, outcomes, models, information, method or process disclosed in this document or that such use may not infringe the rights of any third party. No responsibility or liability is or will be accepted by SPEN, or any person acting on its behalf, including but not limited to any liabilities with respect to the use of, or for damage resulting in any way from the use of, any learnings, outcomes, models, information, apparatus, method or process disclosed in the document. 3. ISSUE RECORD This is a Future Networks project document prepared to facilitate transition to Business as Usual application following successful demonstration of LV Engine smart transformer sites. Updates will be required post trial. Issue Date Issue No. Author Amendment details October 2019 0 LV Engine First release May 2020 0.1 LV Engine Incorporating wider business inputs 4. ISSUE AUTHORITY Author Owner Issue Authority 5. REVIEW This is a PROJECT document and shall be reviewed prior to Business as Usual application. © SP Energy Networks Page 1 of 28 Technical Specification for LV Automation applied to LV Engine trail sites 6. DISTRIBUTION This is a PROJECT document and is not part of a Manual maintained by Document Control and does not have a maintained distribution list. © SP Energy Networks Page 2 of 28 Technical Specification for LV Automation applied to LV Engine trail sites 7. CONTENTS 1. SCOPE ....................................................................................................................................... 1 2. ISSUE RECORD ........................................................................................................................ 1 3. ISSUE AUTHORITY .................................................................................................................. 1 4. REVIEW ..................................................................................................................................... 1 5. DISTRIBUTION .......................................................................................................................... 2 6. CONTENTS ............................................................................................................................... 3 7. DEFINITIONS ............................................................................................................................ 5 8. REFERENCE AND RELATED DOCUMENTS .......................................................................... 6 8.1 International Electrotechnical Commission Publications (IEC) ............................. 6 8.2 European Standards (BS EN) .................................................................................... 7 8.3 Energy Networks Association (ENA) Technical Specifications and British Standards .................................................................................................................................. 7 9. INTRODUCTION ........................................................................................................................ 8 10. GENERAL REQUIREMENTS ................................................................................................... 8 10.1 Service Conditions...................................................................................................... 8 10.2 LV Network Earthing ................................................................................................... 9 10.3 Network Specific Parameters .................................................................................... 9 10.3.1 Voltage .................................................................................................................... 9 10.3.2 Frequency ............................................................................................................... 9 10.3.3 Fault Level ............................................................................................................... 9 11. REMOTE CONTROL LV CIRCUIT BREAKERS .................................................................... 10 11.1 General Requirements .............................................................................................. 10 11.1.1 Normal Operation .................................................................................................. 10 11.1.2 EMS Instructed Operations ................................................................................... 10 11.1.3 Fault Conditions .................................................................................................... 10 11.2 Technical Requirements .......................................................................................... 11 11.2.1 Protection Requirements ....................................................................................... 11 11.2.2 Secondary Protection ............................................................................................ 12 11.2.3 Control Circuits ...................................................................................................... 12 11.2.4 Reverse Power Flow ............................................................................................. 12 11.3 Design and Consideration ....................................................................................... 13 11.3.1 General Requirements .......................................................................................... 13 11.3.2 Communication ..................................................................................................... 13 11.3.3 Alarms and Monitoring .......................................................................................... 14 11.3.4 I/O Schedule .......................................................................................................... 15 11.3.5 Device Labelling and Identification ........................................................................ 16 12. REMOTE CONTROL LV SWITCHES ..................................................................................... 17 12.1 General Requirements .............................................................................................. 17 12.1.1 Normal Operation .................................................................................................. 17 12.1.2 EMS Instructed Operations ................................................................................... 17 © SP Energy Networks Page 3 of 28 Technical Specification for LV Automation applied to LV Engine trail sites 12.1.3 Fault Condition ...................................................................................................... 18 12.2 Technical Requirements .......................................................................................... 18 12.2.1 Rated Short Time Withstand Current .................................................................... 18 12.2.2 Control Circuits ...................................................................................................... 18 12.3 Design and Consideration ....................................................................................... 19 12.3.1 General Requirements .......................................................................................... 19 12.3.2 Communication ..................................................................................................... 19 12.3.3 Alarms and Monitoring .......................................................................................... 19 12.3.4 I/O Schedule .......................................................................................................... 19 12.3.5 Device Labelling and Identification ........................................................................ 21 13. CONTROL & COMMUNICATION SYSTEMS ......................................................................... 21 13.1 Real-time performance monitoring and SCADA .................................................... 21 13.2 Communication between devices ........................................................................... 21 13.3 Existing system Interfaces ....................................................................................... 22 13.4 IT/OT Security ............................................................................................................ 23 13.4.1 Requirements ........................................................................................................ 23 13.4.2 Software and Firmware Maintenance ................................................................... 23 13.4.3 Device Management ............................................................................................