2-8 L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUALSECURITY CHAPTER 2: PRODUCT DESCRIPTION22.2.4 Direct transfer trippingThe L90 includes provision for sending and receiving a single-pole direct transfer trip (DTT) signal from current differentialprotection among the L90 relays at the line terminals using the pilot communications channel. The user can also initiate anadditional eight pilot signals with an L90 communications channel to create trip, block, or signaling logic. A FlexLogicoperand, an external contact closure, or a signal over the LAN communication channels can be assigned for that logic.2.3 SecurityThe following security features are available:• Password security — Basic security present by default• EnerVista security — Role-based access to various EnerVista software screens and configuration elements. Thefeature is present by default in the EnerVista software.• CyberSentry security — Advanced security available using a software option. When purchased, the option isautomatically enabled, and the default Password security and EnerVista security are disabled.2.3.0.1 EnerVista securityThe EnerVista security management system is a role-based access control (RBAC) system that allows an administrator tomanage the privileges of multiple users. This allows for access control of UR devices by multiple personnel within asubstation and conforms to the principles of RBAC as defined in ANSI INCITS 359-2004. The EnerVista securitymanagement system is disabled by default to allow the administrator direct access to the EnerVista software afterinstallation. It is recommended that security be enabled before placing the device in service.Basic password or enhanced CyberSentry security applies, depending on purchase.2.3.0.2 Password securityPassword security is a basic security feature present by default.Two levels of password security are provided: command and setting. Use of a password for each level controls whetherusers can enter commands and/or change settings.The L90 supports password entry from a local or remote connection. Local access is defined as any access to settings orcommands via the front panel interface. This includes both keypad entry and the through the front panel RS232 port.Remote access is defined as any access to settings or commands via any rear communications port. This includes bothEthernet and RS485 connections. Any changes to the local or remote passwords enables this functionality.When entering a settings or command password via EnerVista or any serial interface, the user must enter thecorresponding connection password. If the connection is to the back of the L90, the remote password must be used. If theconnection is to the RS232 port of the front panel, the local password applies.Password access events are logged in the Event Recorder.2.3.0.3 CyberSentry securityCyberSentry embedded security is available using software options that provide advanced security services. When anoption is purchased, the basic password security is disabled automatically.CyberSentry provides security through the following features:• An Authentication, Authorization, Accounting (AAA) Remote Authentication Dial-In User Service (RADIUS) client that iscentrally managed, enables user attribution, provides accounting of all user activities, and uses secure standards-based strong cryptography for authentication and credential protection• A Role-Based Access Control (RBAC) system that provides a permission model that allows access to UR deviceoperations and configurations based on specific roles and individual user accounts configured on the AAA server (thatis, Administrator, Supervisor, Engineer, Operator, Observer roles)• Security event reporting through the Syslog protocol for supporting Security Information Event Management (SIEM)systems for centralized cybersecurity monitoring
