SEL RTAC Cybersecurity Hardening — NERC CIP Compliance
Key Takeaway
How to harden the SEL RTAC for NERC CIP — password management, port hardening, role-based access, audit logging, encrypted communications, and electronic security perimeter design.
Quick Answer
RTAC cybersecurity hardening for NERC CIP includes changing default credentials, disabling unused ports/services (Telnet→SSH, HTTP→HTTPS), enabling audit logging, implementing DNP3 SAv5, and designing the electronic security perimeter with the RTAC as the access point.
NERC CIP Standards
- CIP-005 — Electronic Security Perimeter (RTAC as access point)
- CIP-007 — Systems Security Management (ports, passwords, patches, logging)
- CIP-010 — Configuration Change Management
- CIP-013 — Supply Chain Risk Management
Hardening Steps
- Change factory default web credentials immediately
- Create named user accounts (no shared accounts)
- Disable Telnet, enable SSH; disable HTTP, enable HTTPS
- Document all active ports and services
- Enable system event logging, forward to centralized syslog
- Enable DNP3 SAv5 for SCADA communication
SEL-3555 Features
Secure boot, hardware TPM, signed firmware updates. Preferred for new NERC CIP deployments.
See also SEL device cybersecurity and OT cybersecurity for data centers.
Frequently Asked Questions
Yes, when associated with high-impact or medium-impact BES cyber systems at transmission substations meeting BES criteria.
In ACSELERATOR RTAC system settings — disable Telnet, enable SSH as encrypted replacement. Document per CIP-007.
Security Patch Notifications alert customers to firmware vulnerabilities and patches. CIP-010 requires tracking and managing patches.