SUMMARY SUPERINTENDENT OF PLANNING, HIGH VOLTAGE PROJECTS, ENGINEERING AND AUTOMATION DISTRIBUTION DISTRIBUTION ASSETS ENGINEERING MANAGEMENT

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1 SUMMARY Pág. DISTRIBUCTION REF. CONEM 1. OBJECTIVE OF THE DOCUMENT GENERAL CONDITIONS MATERIAL INFORMATIONS DEFINITIONS Supplier with homologated Material Supplier with Pre-Homologated Material National or Nationalized Supplying Foreign Supplying GENERAL REQUIREMENTS Applicability of Homologated Products Technical Documentation of Homologated and Pre-Homologated Products TECHNICAL INDUSTRIAL QUALIFICATION BY CEMIG TECHNICAL DOCUMENTATION IN CASE OF CONTRACTING MAINTENANCE OF THE HOMOLOGATED STATUS DOCUMENTS TO BE SENT TO THE HOMOLOGATION REQUEST Tables with information about products and manufacturers Technical documentation (drawings, manuals, catalogs, and others) Special and Type Test Reports REFERENCE DOCUMENTATION Annex A - Questionnaire to Industrial Technical Qualification VIEW ATTENTION:. BEFORE USING THIS DOCUMENT, CHECK IF THIS IS THE CURENTE VERSION.. SUGGESTIONS TO THIS DOCUMENT, PLEASE CONTACT THE DISTRIBUTION OF ASSETS ENGINEERING MANAGEMENT (GERÊNCIA DE ENGENHARIA DE ATIVOS DA CEMIG DISTRIBUIÇÃO). DRAWN e COMPANHIA ENERGÉTICA DE MINAS GERAIS ELABOTARED d c b a MSN/PRFCC 27/06/16 SUPERINTENDENT OF PLANNING, HIGH VOLTAGE PROJECTS, ENGINEERING AND AUTOMATION DISTRIBUTION DISTRIBUTION ASSETS ENGINEERING MANAGEMENT Approval WAAV TECHNICAL REQUIREMENTS FOR HOMOLOGATION (TRHP) OF SF6 GAS INSULATED SWITCHGEAR (GIS) INFORMATION CLASSIFICATION PA/EA 38 a 14 pages REVISIONS 26/06/2016 ARQ.

2 2 CLASSIFICATION: TECHNICAL REQUIREMENTS FOR HOMOLOGATION (TRHP) OF SF6 GAS INSULATED SWITCHGEAR (GIS) 1. OBJECTIVE OF THE DOCUMENT 1.1. This document (TRHP) aims to complement the specification PA/EA-1 and establish specific requirements for homologation of SF6 Gas Insulated Switchgear by the suppliers, as defined in item 1.2 of specification PA/EA In case of divergence between the requirements of this document and the specification PA/EA-1, this document will prevail Due to the complexity and extension of the documentation of this equipment, the deadline for the analysis of all documentation, explanations, and technical qualification is ninety (90) days from the date of receipt of complete documentation, or as needed CEMIG. 2. GENERAL CONDITIONS 2.1. In addition to the requirements provide in this document the supplier must meet the foreseen conditions of PA/EA The premise is that homologation is required only for products already developed, with type and special tests performed in accordance with relevant standards The requirements are applicable to SF6 Gas Insulated Switchgear and its main equipment (Circuit Breaker, Current Transformer, Potential Transformer, Surge Arresters, Disconnector and Earthing Switch). The manufacturer of GIS is responsible to homologate all these components In order to start the homologation process, it should be presented the complete documentation specified in Item 9 - DOCUMENTS TO BE SENT TO THE HOMOLOGATION REQUEST After homologation, CEMIG may, at any time, check the continuity of customer requirements Alternatively, the carrying out of type and special tests is allowed for qualification and validation of type and / or special test reports, according to criteria defined in the document ED/AT-7, in order to be classified as pre-homologated or homologated By participating in the homologation process, the manufacturer agree that, after obtaining its homologation, the occurrence of any disqualification from the manufacturer, motivated and evidenced in events that led to the loss or suspension of the homologation status until being resolved nonconformities, he will abdicate to participate of corresponding Material Group (MG),

3 3 CLASSIFICATION: in tenders and product offerings when CEMIG is the final destination of the product, regardless of manufacturing origin. If it was done, inadvertently, it should withdraw its proposal in order to avoid disruption of the process. 3. MATERIAL INFORMATIONS Material/Equipment: Product Group: SF6 GAS INSULATED SWITCHGEAR (GIS) 5723 CEMIG Technical Specifications: CEMIG Standard drawing: ED/AT-19 SF6 Gas Insulated Switchgear and Do not exist. references in item Erro! Fonte de referência não encontrada. of this document Sampling required for homologation and pre-homologation tests: Preferably, the type tests should have already been conducted. If their reports were not validated, they shall be performed on a sample of each bay (functional unit) for each model. The sampling aims represent the complete project which is requested the homologation. Typical Bays assembled with all components for samples: transformers bay; overhead or underground transmission lines bay; buses interconnection bay. CODES: SF6 GAS INSULATED SWITCHGEAR, TYPE 1, 145kV, 2000A, 40kA, 275/650/- Kv, 200MVA, INTERNAL APPLICATION, DOUBLE ARRANGEMENT, 3 LINE BAY, 6 CT 1200/ A, 2 CIRCUIT-BREAKERS 1250A, 3 DISCONNECTORS 1250A MOTORIZED OF 3 POSITIONS, EARTHING SWITCHES, COMPLETED WITH ALL COMPONNENTS AND ACCESSORIES, INCLUDING FRAMES ACCESSORIES FOR FIXING THE FOUNDATIONS. SPECIFICATION ED/AT-19B SF6 GAS INSULATED SWITCHGEAR, TYPE 2, 145kV, 2000A, 40kA, 275/650/-kV, 200MVA, INTERNAL APPLICATION, DOUBLE ARRANGEMENT, 3 LINE BAY, 3 CT 1200/ A, 2 CIRCUIT-BREAKERS 1250A, 3 DISCONNECTORS 1250A MOTORIZED OF 3 POSITIONS, EARTHING SWITCHES, SURGE ARRESTERS, COMPLETED WITH ALL COMPONNENTS AND ACCESSORIES, INCLUDING FRAMES ACCESSORIES FOR FIXING THE FOUNDATIONS. SPECIFICATION ED/AT-19B SF6 GAS INSULATED SWITCHGEAR, TYPE 3, 145kV, 2000A, 40kA, 275/650/- kv, 200MVA, EXTERNAL APPLICATION, AERIAL CONNECTION FOR BUSHINGS, DOUBLE ARRANGEMENT, 2 LINE BAY, 3 CT 1200/ A, 1 CIRCUIT-BREAKER 1250A, 2 DISCONNECTORS 1250A MOTORIZED OF 3 POSITIONS, EARTHING SWITCHES, COMPLETED WITH ALL COMPONNENTS AND ACCESSORIES, INCLUDING FRAMES ACCESSORIES FOR FIXING THE FOUNDATIONS. SPECIFICATION ED/AT-19B 4. DEFINITIONS The definitions below are applicable to technical homologation of SF6 Gas Insulated Switchgear, and they prevail over the specification PA / EA Supplier with homologated Material

4 4 CLASSIFICATION: It refers to supplier: a) Registered at CEMIG; b) Approved in the technical qualification; c) With equipment in which type and special tests satisfactorily performed or have the test reports technically validated, according to item 4 of the technical specification No ED / AT-7. d) Meet the requirements of this document. 4.2 Supplier with Pre-Homologated Material It is the provider that partially meets the homologation requirements, once it does not meet the letter "c)" achievement or validation of all type tests, but have reports that meet the eligibility criteria of the type and special tests reports, according to item 3 of the technical specification No ED / AT-7. In other words, the supplier is under homologation. 4.3 National or Nationalized Supplying Manufacturer that has industrial installation in Brazil, own or formally constituted, for manufacturing or assembling, or customizing of its product, and which the accomplishment of routine and receiving tests, for final delivery of the its product, is expected to take place in Brazil. 4.4 Foreign Supplying Manufacturer that has its industrial installation outside from Brazil for manufacturing or assembling, and for performing routine and receiving tests in the final product. 5. GENERAL REQUIREMENTS 5.1 Applicability of Homologated Products Products can be applied in power electrical system expansion, maintenance and reform by CEMIG, and by consumers or generator when accessing on CEMIG s system (PART market). 5.2 Technical Documentation of Homologated and Pre-Homologated Products Once it was evaluated, design, key components, its subcontractors, and technical documentation verified in the process, these can t be changed without previous knowledge of CEMIG. 6. TECHNICAL INDUSTRIAL QUALIFICATION BY CEMIG 6.1. It shall be considered Technical Industrial Qualification for the factories of GIS and the main equipment that compose it, which according to the supplying history of the indicated plant may

5 5 CLASSIFICATION: be waived at the discretion of CEMIG. The performing period must be agreed between CEMIG and manufacturer Factories which are not qualified cannot supply to CEMIG Annex A of this document must be filled up during Technical Industrial Qualification It must be informed if there is some recommendation of any spare parts for the warranty period, for corrective and preventive maintenance failures. If there is something, the manufacturer must have these parts available during the warranty period The manufacturer, or formal subcontracted, must have availability for technical assistance related to the product. It shall be provided information regarding to the professionals and evidence training of these professionals, such as service reports and training certificates Technical assistance shall secure, during the delivery and warranty period, visiting the field at CEMIG and failure diagnosis in a maximum time of 15 consecutive days after the communication. The diagnosis must be formalized by Failure Diagnosis Report issued by the manufacturer For interruption failures, due to the complexity of the study and analysis, are accepted periods up to 30 days for the diagnosis after its formal activation. However, the place where the occurrence happened must be visited in a period equal or lower than 15 days In order to fulfill the diagnosis terms earlier mentioned is desirable that the manufacturer starts the investigation as soon as possible in order to not impact the total diagnosis period and issuance of Failure Report For diagnosed solutions the manufacturer must restore the operating conditions up to 60 days after diagnosis For interruption failures, if the failure diagnosis demonstrably indicates that they were due to equipment design, the manufacturer must restore the operating conditions within 120 days after diagnosis. For interruption failures which are not associated with the project, the period to restore the operating conditions is 60 days after diagnosis. 7. TECHNICAL DOCUMENTATION IN CASE OF CONTRACTING It will be not necessary sending all technical documentation required in the specifications to the homologated products. Only the technical documentation referent to the arrangement (electromechanic, civil, supporting structure, and identification nameplates) and electrical project of the set integration is planned to be supplied by manufacturer, and verified by CEMIG. 8. MAINTENANCE OF THE HOMOLOGATED STATUS

6 6 CLASSIFICATION: The homologation requirements must be supported by manufactures as a condition to keep their names in the list of homologated suppliers. Unsatisfactory supply quality, such as: the failure of the product or the lack of technical assistance, inadequate equipment delivery in relation to the homologated project, delay in delivery, no service warranty requirements, it will lead to loss or suspension of status. The loss or suspension of homologation and pre-homologation will also involve the loss or suspension of all items of the respective GIS Material Group (MG). 9. DOCUMENTS TO BE SENT TO THE HOMOLOGATION REQUEST Notes: 1. It shall be sent documentation related to GIS and the main equipment and materials that compose it. 2. In order to have a better understanding, CEMIG reserves the right to request additional information from the manufacturer, its subcontractors or customers indicated in providing history. 3. It shall be used the template "Table 8 Delivery Guide and Control Document Proceeding" for documents to be delivered in the homologation request Tables with information about products and manufacturers They have to be sent, filled out by the applicant, attached to the homologation request the following tables: a) Table 1 - Equipment and Factories proposed for homologation The table must be filled, by the manufacturer, with the product type, description, plants, and other fields. In the first column, it is necessary to indicate which CEMIG material code the project is associated with. The factory habilitation consists of quality analysis in the production chain, and the ability to perform routine tests and inspection, specifically for equipment in homologation, according to standards and specifications of CEMIG. b) Table 2 - Supplies History List c) Table 3 - Historical and List of Quality Control indexes, Customers Complaints Service, and Fault History It is required that the manufacturer send information of quality control on stage of fabrication, field assembling and operation (applicable to GIS and its components). Moreover, information about solutions of customers complaints and failure examples, corrective

7 7 CLASSIFICATION: maintenance reports, and solutions adopted to minimize the impact for customers are also required. d) Table 4 - List of Technical Assistance Contacts and Technical Training The manufacturer has to provide technical assistance in the supplying phases, installation, testing, and operation of the product. Moreover, it is also necessary the possibility to make personal contact within 48 hours after some failure, and it needs to be allowed notifying the failure event, at least by . The qualification of the technical support must be validated by training certificates and service reports. e) Table 5 Spare Parts Recommended for the Warranty Period The recommended spare parts are related to those ones which have more probability to be used during the warranty period, according to the quality control of the manufacturer. The manufacturing time for these parts must not interfere with the deadline set out in item 6. In other words, the manufacturer has to be prepared to provide support for its customer during the warranty period, in order to minimize the unavailability of the equipment. f) Table 6 Copies of Routine Testing Reports Related to the Proposal g) Table 7 Copies of Type and Special Testing Reports It must be sent copies of Type and special testing reports, performed on GIS and the main equipment which are part of it, according to item Type Tests reports. The list of reports must be filled through the Annex A of the Technical Specification ED / AT-7. h) Table 8 - Delivery Guide and Document Transit Control Fill in the list of the documents attached to the homologation request Technical documentation (drawings, manuals, catalogs, and others) In addition to the mentioned tables, it shall be also sent technical documentation containing details of the design about the proposed equipment, in order to allow checking the tested design. These documents have to be included in the list of delivery guide and control document proceeding Documents related to the GIS SF6 a) APPENDIX A - Table of Technical Data and Guaranteed Features from specification ED/AT-19;

8 8 CLASSIFICATION: b) Arrangement, outline drawings and dimensions of the typical bays and each component of GIS modules, including operating mechanisms; c) Arrangement, outline drawings and dimensions of cubicles for local control of the modules, indicating their components; d) Schematics diagrams related to the control of GIS modules for typical bays; e) Scheme of compressed air or hydraulic system, when applicable; f) Dimensional drawings of insulated cables transitions and bushings for GIS; g) Dimensional drawings of the bushings and output plugs of 138 KV, and terminals; h) Drawings of technical characteristic nameplate; i) Excitation curves of current transformers; j) Catalogs of components such as bus bars, compensated pressure monitor, flanges sealing rings, components and mechanisms for operating, and others; k) Brief description of the assembling process in field, testing, commissioning, and staff required for typical spans; l) GIS Instruction Manual; m) Technical deviations applicable to some eventual item in the specifications and standards. References must be given and referenced Circuit Breakers a. APPENDIX A - Technical Data and Guaranteed Features from specification CEMIG Disconnectors and Earthing Switches a. APPENDIX A - Technical Data and Guaranteed Features from specification CEMIG Current Transformers a. APPENDIX A - Technical Data and Guaranteed Features from specification CEMIG Voltage Transformers a. APPENDIX A - Technical Data and Guaranteed Features from specification CEMIG Surge Arresters a. APPENDIX A - Technical Data and Guaranteed Features from specification CEMIG Special and Type Test Reports Notes:

9 9 CLASSIFICATION: 1. In order to optimize the documentation and analysis, it is required sending only one report for each equipment and test. 2. In the reports shall be possible to detailed identify the tested equipment, through drawings, in order to allow a comparison with the project in homologation Test Reports related to GIS SF6 a. Dielectric tests (clause 6.2 of IEC /2003), including: Power-frequency voltage tests Lightning impulse voltage tests Partial discharge tests Dielectric tests on auxiliary and control circuits b. Radio interference voltage test (clause 6.3 of IEC /2003), if applicable; c. Resistance measurement of the main circuit (clause 6.4 of IEC /2003); d. Temperature rise test (clause 6.5 of IEC /2003); e. Short-time withstand current and peak withstand current tests, to main circuit and earthing device (clause 6.6 of IEC /2003); f. Basic short-circuit test-duties (6.106 clause of IEC /2012, and clause of IEC ): Basic short-circuit test-duties; Short-line fault tests; No-load line-charging breaking tests; No-load cable-charging breaking tests; Induced current switching by earthing switches (6.101 clause of IEC / 2003 and clause and Annex C of IEC / 2003). The applicability of the induced current switching requirement will be defined in the public notices of acquisition. g. Verification of the degrees of protection - testing of the degrees of protection of the control cabinets and operating mechanism (clause 6.7 of IEC / 2003); h. Mechanical operation test, 2000 cycles (closing-opening each) for circuit breakers, disconnectors and earthing switches (clause of IEC / 2012); i. Test to verify the proper functioning of the position and interlock indication device ( clause 6,102.1 of IEC / 2003); j. Proof tests for enclosures (6.103 clause of IEC / 2003); k. Gas tightness tests (clause 6.8 of IEC / 2003); l. Supportability test for the internal pressure of the enclosures due to an internal arc (clause of IEC / 2003);

10 10 CLASSIFICATION : m. Specific tests according to the applicable standards for components such as instrument transformers, surge arresters, disconnector, earthing switch, enclosure, and others Current Transformers (clause of NBR 6856/1992) a. Lightning impulse voltage tests, when they are not performed in conjunction with the GIS; b. Temperature-rise tests, when they are not performed in conjunction with the GIS; c. Short-time withstand current and peak withstand current tests, when they are not performed in conjunction with GIS; d. Open circuit voltage Voltage Transformers (6.1.2 clause NBR 6855/1992) a. Windings Resistance; b. Excitation current and no-load losses; c. Short-circuit impedance; d. Lightning impulse voltage tests, when they are not performed in conjunction with the GIS; e. Short circuit; f. Temperature-rise tests, when they are not performed in conjunction with the GIS Surge Arresters a. Insulation withstand tests, when they are not performed in conjunction with the GIS (clause 8.2 of IEC /2014); b. Residual voltage tests (clause 8.3 of IEC /2014); c. Long term stability in continuous operation voltage tests (clause 8.4 of IEC / 2014); d. Operating duty test (clause 8.7 of IEC /2014); e. Power-frequency voltage versus time test (clause 8.8 of IEC /2014); f. Short-circuit tests (clause 8.10 of IEC /2014).

11 11 CLASSIFICATION : 10. REFERENCE DOCUMENTATION a) ED/AT-19 - Subestação Blindada Isolada a Gás SF6; b) PE/LS Disjuntores e EPPT para Sistemas de Transmissão e Distribuição (Especificação Complementar); c) PE/LS Transformadores para Instrumentos de Alta Tensão 69 a 161kV - Especificação Técnica Complementar às especificações CEMIG-300 e CEMIG-301 (Especificação Complementar); d) ER/SE Secionadores para Sistemas de Transmissão e Subtransmissão (Especificação Complementar); e) CEMIG Disjuntores para Sistemas de Transmissão e Distribuição; f) CEMIG Circuit Breakers for Transmission and Distribution Systems; g) CEMIG Transformadores de Corrente para Sistemas de Transmissão; h) CEMIG Current Transformers for Transmission Systems; i) CEMIG Transformadores de Potencial Indutivos para Sistemas de Transmissão; j) CEMIG Inductive Potential Transformers for Transmission Systems; k) CEMIG Seccionadores para Sistemas de Transmissão; l) ED/AT-7 - Relatórios de Ensaios de Tipo - Qualificação Técnica d Validação em Processos de Homologação de Equipamentos para Subestações e Linhas. m) PA/EA-1 - Critérios para Homologação e Pré-Homologação de Material para a CEMIG

12 12 CLASSIFICATION : Annex A - Quiz for Industrial Qualification and Technical Assistance (Page 1/3) Equipment: SF6 Gas Insulated Switchgear (GIS SF6) Date: Manufacturer: Manufacturing unit: Equipment Model: Address: 1) Cemig codes required for homologation that are produced in industrial unit: ) Possible routine tests to be carried out in the Industrial Unit: 1 Visual and dimensional check 2 Power-frequency voltage tests on the main circuit 3 Partial discharge measurement 4 Tests on auxiliary and control circuits - Power-frequency voltage 5 Measurement of the resistance of the main circuit 6 Tightness test 7 Pressure tests of enclosures 8 Mechanical operation tests 9 Tests on auxiliary circuits, equipment and interlocks in the control mechanism 10 Pressure test on partitions Specific tests as applicable standards of components, such as circuit breaker, 11 instrument transformers, surge arrester, disconnector, earthing switch, etc. Verification tests of interchangeability of components of the same nominal 12 characteristics and construction Measurement tests resistance DC and AC insulation for buses and equipment 13 components of the sections to the land Availability and traceability of Routine Testing Reports acquis for the product 14 proposed for approval Note: If the GIS manufacturer has no ability to perform routine and receiving tests on the components of its manufacturing unit, it must be demonstrated the ability to perform these tests on its subcontractors. Comments:

13 13 CLASSIFICATION : Appendix A - Quiz for Industrial Qualification and Technical Assistance (Page 2/3) Equipment: SF6 Gas Insulated Switchgear (GIS SF6) 3) If recommended by the manufacturer for the warranty period, availability of spare parts (list): 4) Technical assistance Name of Responsible Address Contacts Telephone: 5) Services provided by the Technical Assistance (examples and references) Name of Responsible Client Client contacts Services provided / Reports

14 14 CLASSIFICATION : Appendix A - Quiz for Industrial Qualification and Technical Assistance (Page 3/3) Equipment: SF6 Gas Insulated Switchgear (GIS SF6) 6) Quality Control Requirements 1 - Are the test results available in traceable reports with the information required in technical standards and specifications? 2 Does the manufacturer uses indexes of customer complaints quality control and returns, registering, for example, failure percentage after delivery and identification of equipment and components that have failed? 3 - Are there records and control of materials and subcontractors? Y/N 4 - Is there traceability for raw materials used in the production of items proposed for approval? 5 Are Certificates / reports of tests carried out by sub-suppliers of components required and recorded (such as circuit breakers, measurement transformers, disconnectors, SF6, etc.), especially for cases that the GIS manufacturer does not perform at its factory routine tests? 6 Are the packaging and contents properly identified and meets customer specification requirements? CEMIG responsible CEMIG by enabling Name: Manufacturer responsible for the information Name: Signature: Signature: Elaborate Date Check Date MS/QL Quality Management of Material and Suppliers