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NERC TPL-007-1: What you need to know Webinar February 7, 2017

usa.siemens.com/digitalgridUnrestricted Siemens Industry, Inc. 2017

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Geomagnetic Disturbance (GMD) and Electric Power System

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FERC Order 779

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FERC Order 779 (continued)

As per FERC Order No. 779, NERC to develop Standards that address risks to electric grid reliability caused by GMDs in two stages:

Stage 1 - Standard(s) that require applicable entities to develop and implement Operating Procedures. EOP-010-1 Geomagnetic Disturbance Operations was approved by FERC in June 2014.

Stage 2 - Standard(s) that require applicable entities to conduct assessments of the potential impact of benchmark GMD events on their systems. If the assessments identify potential impacts, the Standard(s) will require the applicable entity to develop and implement a plan to mitigate the risk.TPL-007-1 is a new Reliability Standard to specifically address this Stage 2 directive. This was approved by FERC on 22 September2016.

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FERC Order 830

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FERC Order 830 (continued)

NERC to develop modifications to Reliability Standard TPL-007-1:

(1) To modify the benchmark GMD event definition set forth in Attachment 1 of Reliability Standard TPL-007-1, as it pertains to the required GMD Vulnerability Assessments and transformer thermal impact assessments, so that the definition is not based solely on spatially-averaged data;

(2) To require the collection of necessary geomagnetically induced current monitoring and magnetometer data and to make such data publicly available; and

(3) To include a one-year deadline for the development of corrective action plans and two and four-year deadlines to complete mitigation actions involving non-hardware and hardware mitigation, respectively.

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What is NERC TPL-007-1?

TitleTransmission System Planned Performance for Geomagnetic Disturbance Events

PurposeEstablish requirements for Transmission system planned performance during geomagnetic disturbance (GMD) events.

Applicable to: Planning Coordinator Transmission Planner Transmission Owner Generator Owner

with Facilities that include power transformer(s) with a high side, wye-grounded winding with terminal voltage greater than 200 kV.

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TPL-007-1Requirements and Measures R1 and M1

Geomagnetic Disturbances (GMDs) Vulnerability Assessment: Documented evaluation of potential susceptibility to voltage collapse, Cascading, or localized damage of equipment due to GMD.

R1: Identify Responsible EntitiesIdentify individual or joint responsibilities of the Planning Coordinators and Transmission Planners in the Planning coordinators planning area for maintaining models and performing studies needed to complete GMD Vulnerability Assessment required in R4.

M1: Responsible entities provide documented information on roles and responsibilities.

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TPL-007-1Requirements and Measures R2 and M2

R2: Grid and GIC system ModelsResponsible entities maintain System models and GIC System (DC) models of the responsible entitys planning area for performing the studies needed to complete GMD Vulnerability Assessment(s).

M2: Responsible entities have System models and GIC system models in either electronic or hard copy format.

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TPL-007-1 Requirements and Measures R3 and M3

R3: Acceptable Grid Steady State Voltage Limits criteriaResponsible entities have criteria for acceptable System steady state voltage performance for its System during the benchmark GMD event.

M3: Responsible entities have acceptable System steady state voltage performance criteria documented in either electronic or hard copy format.

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TPL-007-1Requirements R4

R4: Vulnerability Assessment StudiesResponsible entities complete a GMD Vulnerability Assessment of the Near-Term Transmission Planning Horizon once every 60 calendar months. This GMD Vulnerability Assessment studies are based on models identified in Requirement R2, document assumptions, and document summarized results of the steady state analysis.

4.1 The network conditions include: 4.1.1 System On-Peak Load for at least one year within the Near-Term

Transmission Planning Horizon; and 4.1.2 System Off-Peak Load for at least one year within the Near-Term

Transmission Planning Horizon.

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TPL-007-1Requirements and Measures R4 (contd) and M4

4.2 The studies are conducted based on the benchmark GMD event to determine whether system meets performance requirements ( in Table 1).

4.3 Within 90 calendar days of completion of the studies, the GMD Vulnerability Assessment is provided to responsible entitys Reliability Coordinator, adjacent Planning Coordinators, adjacent Transmission Planners and any functional entity that request it and has a reliability related need. 4.3.1 Any documented comments by a recipient of these studies, the

responsible entity provide documented response within 90 calendar days.

M4: Responsible entities have dated evidence in either electronic or hard copy format of actions performed to fulfill requirements R4.

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TPL-007-1R4 Performance Criteria

The vulnerability Assessment Studies shall meet following performance criteria.(Table 1 of TPL-007-1) Voltage collapse, Cascading and uncontrolled islanding shall not occur. Generation loss is acceptable as a consequence of the planning event. Planned System adjustments such as Transmission configuration changes and

re-dispatch of generation are allowed if such adjustments are executable within the time duration applicable to the Facility Ratings.

The GMD event could cause tripping of Reactive Power Compensation Devices and other Transmission Facilities as a result of Protection System operation or mis-operation due to harmonics during the GMD event, then load loss and/or interruption of firm transmission service allowed.

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TPL-007-1Requirements and Measures R5 and M5

R5: GIC(t) Flow for Thermal Impact AssessmentResponsible entities provide GIC flow information to be used for the transformer thermal impact assessment specified in Requirement R6. The GIC flow information include: 5.1 The maximum effective GIC value for the worst case geoelectric field

orientation for the benchmark GMD event. This value is provided to the Transmission Owner or Generator Owner that owns BES power transformer in the planning area.

5.2 Responsible entities provide the effective GIC time series, GIC(t), calculated using the benchmark GMD event upon request from Transmission Owner or Generator Owner within 90 calendar days.

M5: Responsible entities have dated evidence in either electronic or hard copy format of actions performed to fulfill requirements R5.

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TPL-007-1Requirements and Measures R6 and M6

R6: Thermal Impact Assessment StudiesTransmission Owner and Generator Owner conduct a thermal impact assessment for applicable power transformers where the maximum effective GIC value provided in Requirement R5.1 is 75 A per phase or greater. The thermal impact assessment shall: 6.1 Be based on the effective GIC flow information provided in R5 6.2 Document assumptions used in the analysis; 6.3 Describe suggested actions and supporting analysis to mitigate the impact

of GICs, if any 6.4 Be performed and provided to responsibilities entities within 24 calendar

months of receiving GIC flow information.

M6: Transmission Owner and Generator Owner have dated evidence in either electronic or hard copy format of actions performed to fulfill requirements R6.

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TPL-007-1Requirements and Measures R7 and M7

R7: Corrective Action PlanResponsible entities develop a Corrective Action Plan addressing how the performance requirements will be met in case of the GMD Vulnerability Assessment conducted as in R4 shows that the System does not meet the performance requirements of Table 1 (R4). 7.1 List system deficiencies and the associated actions needed to achieve

required system performance. Examples of such actions include: Installation, modification, retirement or removal of transmission and

generation facilities and any associated equipment. Installation, modification, or removal of protection systems or special

protection systems. Use of operating procedures, specifying how long they will be needed as part

of corrective action plan. Use of demand-side management, new technologies etc.

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