DA-401-2019: Security test plan for distribution automation RTUs

Plan to test an distribution automation RTU against the ENCS security requirements.

ENCS has developed a set of security requirement for procuring distribution automation (DA) remote terminal units (RTUs). When the requirements are used, the need arises to evaluate the RTU against the requirements. This document provides a standardized test plan to do this.

By standardizing the test plan, the test results can be more easily shared between grid operators. The vendor of the RTU can perform security tests according to the test plan and then use the test report to show compliance in all tenders that use the security requirements. This reduces the cost of testing and can give grid operators assurance in advance that there are RTUs meeting the requirements.

The test plan consists of three phases:

  1. Functional tests and a vulnerability assessment by the vendor, usually performed during development;
  2. A review of development processes and security design by the grid operator, usually performed during selection;
  3. A penetration test by an external lab, usually performed after the RTU has been selected.

DA-101-2019: Security risk assessment for distribution automation systems

ENCS has developed a security architecture for distribution automation systems. This risk assessment verifies that the measures proposed in the security architecture are enough to mitigate security risks. The risk assessment can also be used to select alternative measures if grid operators cannot implement some of the measures in the security architecture.


DA-390-2019: Market survey on distribution automation RTU security

Results of a market survey on the security of distribution automation (DA) remote terminal units (RTUs) held in November 2019.

ENCS has produced a set of security requirements that grid operators can use for this purpose. To verify that these requirements are feasible in the current market, ENCS has conducted a survey among RTU vendors, asking if they can implement the most advanced requirements. It also asks vendors about their future roadmap and plans to adjust future requirements.


DA-301-2019: Security requirements for procuring DA RTUs

This document gives requirements for procuring secure RTUs for use in distribution automation systems, including:

  • medium to low voltage transformer substations;
  • medium voltage transport substations;
  • automatic circuit recloser controllers applied to overhead distribution lines.

The requirements concern the interfaces to the distribution automation system and the users on these interfaces. The measures are aligned with ISO/IEC 27001:2013. They are designed to fit as much as possible into the processes and procedures already in place in the organizations, and to find the needed balance between the assured security level, feasibility by vendors and the operational impact.

This harmonized set of requirements allows grid operators to get secure automation equipment more cost-effectively, saving their time and effort in developing requirements, as they are already freely available. It has been ensured that the requirements are feasible, as they have been tested in a market survey as well as in previous tenders by other operators. Lastly, these requirements save on implementation costs, as vendors get a common baseline to aim at, and only need to implement the security requirements once and then implement updates in their product roadmap.

The requirements are meant for procuring new RTUs, not for legacy systems, although grid operators may analyze which systems can be upgraded, updated or patched, once more, without disrupting the processes and procedures already in place.


DA-201-2019: Security architecture for distribution automation systems

This document provides a recommended security architecture for DA systems. The architecture can act as a blueprint for system integrators and the departments maintaining the system. Measures are chosen for the entire system, as this is usually more effective than choosing measures per component. It should be used as a reference by grid operators who are seeking to implement the RTU procurement requirements as suggested by ENCS. The architecture is intended to be used together with an information security management system (ISMS) based on ISO/IEC 27001:2013 or similar. Each subsection gives the relevant technical security measures to meet an objective in the ISO/IEC 27001 Annex A.

The distribution automation security architecture covers the central maintenance systems and field devices placed in the medium voltage grids, including in:

  • Medium to low voltage transformer substations
  • Medium voltage transport substations
  • Automatic circuit recloser controllers applied to overhead distribution lines

The architecture includes the interfaces of the DA system and the users on these interfaces. The architecture does not include the internal working on the infrastructure and makes no assumptions on it. The supervisory control and data acquisition (SCADA) system is out of scope. It is considered as an external system accessing the distribution automation system.


SE-390-2016: DA Light Market Survey

Market survey supporting the DA Light Security Requirements


SE-301-2016: DA Light Security Requirements

Security requirements for procuring RTUs for substations that only measure, and do not switch.