Glossary

Additional Transmission System (ATS)

A system comprised of power transmission facilities interconnected to the TS that are mainly and essentially used to provide electrical energy to Free Customers, including those whose main purpose is to enable power companies to inject their production into the power grid, and which are not part of the TTS or the STxS.

Bay

A set of equipment that enables connection of a power facility to the TS, generally comprised of a circuit breaker, disconnectors, instrument transformers, lightning rods, wave traps, coupling condensers, etc.

CDEC Operation Directorate (OD)

The OD is responsible for coordinating compliance with technical standards when connecting a facility to the TS, including the following, among others:

  • a) Establishing, coordinating and preserving overall system service safety, in accordance with the provisions of the technical standards and to annually report the degree of compliance with safety standards by Coordinated Parties to the Directorate.
  • b) Executing Technical Audits required for compliance with functions of current electricity regulations commissioned to this Directorate, such as facility audits, commissioning dates for new power generation and transmission works, variable costs of power generation units declared for the purpose of dispatch, among others.
  • c) Authorizing the connection of new power generation, transmission or consumption facilities or modification of these facilities.
  • d) Reporting non-compliance with Coordination Instructions issued by the OD or CDC to the Superintendence, together with non-compliance by any Coordinated Party of the requirements of these technical standards, which is subject to supervision and monitoring by the OD.
  • e) Determining the disconnection of facilities failing comply with their obligations, as long as this situation jeopardizes Service Quality and Safety (SQS) of the IS.

Verifying compliance with the minimum requirements established in the technical standards for any new facility incorporated into the IS. (Source: NTSyCS published in November 2014).

Central Interconnected System (SIC)

A power grid ranging between Taltal and Chiloé, the largest electricity system in the country.

Connection Point

The busbar at a substation, or starting point at a transmission line, where facilities exploited by different Coordinated Party or facilities are interconnected. These may be exploited by the same Coordinated Party and correspond to different facility categories (see the term “Coordinated Party”). The Connection Point of a power plant to the TS corresponds to the high voltage busbar for power transformers. The Connection Point for Free and Regulated Customers to the TS is produced at the respective Consumption Busbars. Consumption Busbars correspond to busbars with voltage equal to or less than 23 kV for the secondary side of power transformers connected to the TS whose primary voltage is over 23 kV.

Coordinated Party (power generation company, power transmission company, complementary services provider, free customer or regulated customer)

Anyone exploiting facilities that are interconnected in any way shall be understood to be a Coordinated Party, whether these be:

  • A) Power plants;
  • b) Trunk, subtransmission or additional systems transmission lines;
  • c) HVDC links;
  • d) Interconnection lines between interconnected systems;
  • e) Reactive energy compensation equipment;
  • f) Active energy compensation equipment;
  • g) Substations, including Primary Distribution Substations;
  • h) Consumption Busbars for Free Customers fed directly from the Transmission System (TS) or by means of exclusive feeders from medium voltage busbars at Primary Distribution Substations;
  • i) Power Distribution Company facilities.

All Coordinated Parties exploiting facilities in more than one of the above categories must comply with the different requirements established in the Service Quality and Safety Technical Standards (TS) in each of these categories, as a power generation company, power transmission company, complementary services provider, free customer or regulated customer.

Derivation (Tap-Off Connection)

A single connection that is started from a transmission line in order to withdraw or supply power, as long as this line does not belong to the Trunk Transmission System. Conditions for executing tap-off connections are regulated by Article 3-24 and 3-25 of the Technical Standards.

Diagonal for a Substation with a one breaker and a half configuration

A set of equipment used to connect a power facility to the TS, generally comprised of three circuit breakers, disconnectors, instrument transformers, lightning rods, wave traps, coupling condensers, etc.

Dispatch and Control Center (CDC)

The CDEC unit responsible for supervision and coordination of Real Time operation of the IS as a whole and each of the generation units and facilities in the transmission systems.

Economic Load Dispatch Center (CDEC)

A body responsible for determining operation of an Interconnected System (IS) according to the provisions of Article 225, letter b) of the General Electricity Services Law (the Law), whose main functions include the following:

  • a) Preserving service safety;
  • b) Guaranteeing the most economic operation;
  • c) Guaranteeing free access to power transmission systems.

Electricity Protection System

A set of devices and equipment required for detecting and resolving faults that could affect equipment they protect, disconnecting these from the IS as quickly as possible in order to minimize system disturbances and prevent damage to equipment, people or the IS. The Electricity Protection System includes circuit breakers, protection systems, current and potential transformers, teleprotection devices and other equipment required for system operation.

Electricity Substation (ES)

An electrical facility in the Transmission System that is part of an electricity system and is responsible for voltage or frequency transformation, or the connection of two or more transmission line circuits.

Environmental Evaluation Service (SEA)

This consists of a series of procedures that relate the principal of a project or activity with the environmental authority, by means of an Environmental Impact Declaration (DIA) or an Environmental Impact Study (EIA) proving that the project complies with environmental regulations, or that it appropriately compensates for environmental impacts generated. In turn, the authority must verify and certify compliance with said regulations and qualify the pertinence and quality of the measures proposed. This action is taken before project execution.

Environmental Impact Declaration (DIA)

A document that describes a planned activity or project, or modifications that will be made, approved under oath by the respective principal, whose contents enable the competent body to effectively evaluate whether the project is in conformity with current environmental standards (Source: Law 19,300 on Environmental Baselines).

Environmental Impact Study (EIA)

A document that provides a detailed description of the characteristics of a project or activity to be executed or modification of the same. Background information must be provided for the prediction, identification and interpretation of its environmental impact, together with a description of the action or actions to be executed in order to prevent or minimize significantly adverse impacts.

Environmental Qualification Resolution (RCA)

An administrative action by the respective Regional Environmental Commission to the Executive Directorate indicating environmental conformity or non-conformity for a project or activity. If the RCA is favorable, it certifies that the project evaluated complies with environmental regulations and that the project can be executed. Together with the RCA, the project principal needs to comply with all other regulations applicable to the project.

Free Customer

A user that is not subject to price regulation, whose Consumption Busbars are supplied directly from the Transmission System (TS).

Interconnected System (IS)

A set of electricity system facilities that include: power plants; transmission lines at trunk, subtransmission and additional system levels; HVDC links, active energy compensation equipment, electricity substations, including primary distribution substations, and Free Customer Consumption Busbars supplied directly from transmission system facilities or by means of exclusive feeders; which operate in interconnected fashion in order to generate, transmit and distribute electrical energy in said electricity system.

National Energy Commission (CNE)

A technical body responsible for analyzing prices, tariffs and technical standards for power generation, production, transmission and distribution companies in order to make sufficient, safe and quality service compatible with the most economic operation available.

New Projects

These shall be understood as all power generation, transmission or consumption facilities currently in study or construction phases.

Open Access

A regulatory regime in which trunk transmission and subtransmission system facilities can be used by third parties under non-discriminatory technical and economic conditions for all users by means of payment made to the corresponding power transmission system. Only transmission lines making use of the rights of way referred to in Article 77 of the General Electricity Services Law and those that use national public use assets will be entitled to use the open access regulatory regime.

Planning and Development Directorate (PDD)

The PDD is responsible for coordinating actions to enable compliance with the provisions of the technical standards when connecting a facility to the TS. These actions include the following, among others:

  • a) Coordinating and guaranteeing communications between the principals of new power generation, transmission or consumption projects, that have not yet been interconnected to the respective electricity system, and the Coordinated Parties and Members of the corresponding CDEC, as well as their respective Technical Directorates.
  • b) Analyzing and determining optimum connection points to the Trunk Transmission System considering new power generation, transmission and consumption projects based on service quality and safety criteria, to ensure technically and economically optimal connections to the IS.
  • c) Executing audits required to guarantee open access to facilities of the respective Interconnected System.

Protection Relay

A physical device or functional element of this device responsible for detecting a certain type of fault or abnormal condition at a power facility by analyzing and processing the variables measured at the facility. This device is able to decide to change output status depending on a pre-determined criteria.

Protection Scheme

This is a set of protection relays that may or may not include teleprotection functions. In addition, this includes oscillographic records and event records.

Regulated Customer

A Distribution Company or user of connected power equal to or less than 2,000 kW supplied from power generation or transmission facilities.

Sectioning substation, substation

A set of equipment that enables a transmission line to be sectioned at an intermediate point of this line. The minimum configuration is comprised of three circuit breaker bays with their respective protection systems.

Service Quality and Safety Technical Standard (NT)

According to the provisions of the General Electricity Services Law and its current regulations, the general purpose of the Service Quality and Safety Technical Standard is to establish the Service Quality and Safety requirements for interconnected systems. Current version dated July 2014 and Exempt Resolution 586 dated 17 November 2014.

Subtransmission System (STxS)

A system comprised of transmission lines and electricity substations that are interconnected to the Transmission System and arranged to exclusively supply groups of free or regulated end consumers that can be identified a territorial level and are found in distribution company concession zones.

Toll

This corresponds to payment a facility owner is entitled to for rights of way or transmission easement applied by those making use of said facilities.

Transmission System (TS)

A set of transmission lines and electricity substations that make up part of a power grid, including interconnection lines between interconnected systems at a nominal voltage level greater than 23 kV, understanding voltage provided by the highest voltage busbar as nominal voltage at the substation. Each Transmission System includes TTS, STxS and ATS facilities.

Trunk Transmission System (TTS)

A system comprised of transmission lines and electricity substations that are economically efficient and necessary to enable the provision of all TS demand, under different power generation facility availability scenarios, including contingency and fault situations, considering stable service quality and safety requirements established in the General Electricity Services Law, regulations and technical standards.

Under Construction Declaration

New projects in the construction stage when these have been granted the respective civil works construction permit, or if the order to proceed to manufacture and install the corresponding electrical or electromagnetic equipment has been extended for power generation, transmission or transformation, which shall be backed by the respective purchase orders for the manufacture of electricity generators, power transformers, conductors and elements for transmission lines, among others, as required. See articles 31 to 33 of Decree 86, Knot Price Regulations.

Additional Transmission System (ATS)

A system comprised of power transmission facilities interconnected to the TS that are mainly and essentially used to provide electrical energy to Free Customers, including those whose main purpose is to enable power companies to inject their production into the power grid, and which are not part of the TTS or the STxS.

Bay

A set of equipment that enables connection of a power facility to the TS, generally comprised of a circuit breaker, disconnectors, instrument transformers, lightning rods, wave traps, coupling condensers, etc.

CDEC Operation Directorate (OD)

The OD is responsible for coordinating compliance with technical standards when connecting a facility to the TS, including the following, among others:

  • a) Establishing, coordinating and preserving overall system service safety, in accordance with the provisions of the technical standards and to annually report the degree of compliance with safety standards by Coordinated Parties to the Directorate.
  • b) Executing Technical Audits required for compliance with functions of current electricity regulations commissioned to this Directorate, such as facility audits, commissioning dates for new power generation and transmission works, variable costs of power generation units declared for the purpose of dispatch, among others.
  • c) Authorizing the connection of new power generation, transmission or consumption facilities or modification of these facilities.
  • d) Reporting non-compliance with Coordination Instructions issued by the OD or CDC to the Superintendence, together with non-compliance by any Coordinated Party of the requirements of these technical standards, which is subject to supervision and monitoring by the OD.
  • e) Determining the disconnection of facilities failing comply with their obligations, as long as this situation jeopardizes Service Quality and Safety (SQS) of the IS.

Verifying compliance with the minimum requirements established in the technical standards for any new facility incorporated into the IS. (Source: NTSyCS published in November 2014).

Central Interconnected System (SIC)

A power grid ranging between Taltal and Chiloé, the largest electricity system in the country.

Connection Point

The busbar at a substation, or starting point at a transmission line, where facilities exploited by different Coordinated Party or facilities are interconnected. These may be exploited by the same Coordinated Party and correspond to different facility categories (see the term “Coordinated Party”). The Connection Point of a power plant to the TS corresponds to the high voltage busbar for power transformers. The Connection Point for Free and Regulated Customers to the TS is produced at the respective Consumption Busbars. Consumption Busbars correspond to busbars with voltage equal to or less than 23 kV for the secondary side of power transformers connected to the TS whose primary voltage is over 23 kV.

Coordinated Party (power generation company, power transmission company, complementary services provider, free customer or regulated customer)

Anyone exploiting facilities that are interconnected in any way shall be understood to be a Coordinated Party, whether these be:

  • A) Power plants;
  • b) Trunk, subtransmission or additional systems transmission lines;
  • c) HVDC links;
  • d) Interconnection lines between interconnected systems;
  • e) Reactive energy compensation equipment;
  • f) Active energy compensation equipment;
  • g) Substations, including Primary Distribution Substations;
  • h) Consumption Busbars for Free Customers fed directly from the Transmission System (TS) or by means of exclusive feeders from medium voltage busbars at Primary Distribution Substations;
  • i) Power Distribution Company facilities.

All Coordinated Parties exploiting facilities in more than one of the above categories must comply with the different requirements established in the Service Quality and Safety Technical Standards (TS) in each of these categories, as a power generation company, power transmission company, complementary services provider, free customer or regulated customer.

Derivation (Tap-Off Connection)

A single connection that is started from a transmission line in order to withdraw or supply power, as long as this line does not belong to the Trunk Transmission System. Conditions for executing tap-off connections are regulated by Article 3-24 and 3-25 of the Technical Standards.

Diagonal for a Substation with a one breaker and a half configuration

A set of equipment used to connect a power facility to the TS, generally comprised of three circuit breakers, disconnectors, instrument transformers, lightning rods, wave traps, coupling condensers, etc.

Dispatch and Control Center (CDC)

The CDEC unit responsible for supervision and coordination of Real Time operation of the IS as a whole and each of the generation units and facilities in the transmission systems.

Economic Load Dispatch Center (CDEC)

A body responsible for determining operation of an Interconnected System (IS) according to the provisions of Article 225, letter b) of the General Electricity Services Law (the Law), whose main functions include the following:

  • a) Preserving service safety;
  • b) Guaranteeing the most economic operation;
  • c) Guaranteeing free access to power transmission systems.

Electricity Protection System

A set of devices and equipment required for detecting and resolving faults that could affect equipment they protect, disconnecting these from the IS as quickly as possible in order to minimize system disturbances and prevent damage to equipment, people or the IS. The Electricity Protection System includes circuit breakers, protection systems, current and potential transformers, teleprotection devices and other equipment required for system operation.

Electricity Substation (ES)

An electrical facility in the Transmission System that is part of an electricity system and is responsible for voltage or frequency transformation, or the connection of two or more transmission line circuits.

Environmental Evaluation Service (SEA)

This consists of a series of procedures that relate the principal of a project or activity with the environmental authority, by means of an Environmental Impact Declaration (DIA) or an Environmental Impact Study (EIA) proving that the project complies with environmental regulations, or that it appropriately compensates for environmental impacts generated. In turn, the authority must verify and certify compliance with said regulations and qualify the pertinence and quality of the measures proposed. This action is taken before project execution.

Environmental Impact Declaration (DIA)

A document that describes a planned activity or project, or modifications that will be made, approved under oath by the respective principal, whose contents enable the competent body to effectively evaluate whether the project is in conformity with current environmental standards (Source: Law 19,300 on Environmental Baselines).

Environmental Impact Study (EIA)

A document that provides a detailed description of the characteristics of a project or activity to be executed or modification of the same. Background information must be provided for the prediction, identification and interpretation of its environmental impact, together with a description of the action or actions to be executed in order to prevent or minimize significantly adverse impacts.

Environmental Qualification Resolution (RCA)

An administrative action by the respective Regional Environmental Commission to the Executive Directorate indicating environmental conformity or non-conformity for a project or activity. If the RCA is favorable, it certifies that the project evaluated complies with environmental regulations and that the project can be executed. Together with the RCA, the project principal needs to comply with all other regulations applicable to the project.

Free Customer

A user that is not subject to price regulation, whose Consumption Busbars are supplied directly from the Transmission System (TS).

Interconnected System (IS)

A set of electricity system facilities that include: power plants; transmission lines at trunk, subtransmission and additional system levels; HVDC links, active energy compensation equipment, electricity substations, including primary distribution substations, and Free Customer Consumption Busbars supplied directly from transmission system facilities or by means of exclusive feeders; which operate in interconnected fashion in order to generate, transmit and distribute electrical energy in said electricity system.

National Energy Commission (CNE)

A technical body responsible for analyzing prices, tariffs and technical standards for power generation, production, transmission and distribution companies in order to make sufficient, safe and quality service compatible with the most economic operation available.

New Projects

These shall be understood as all power generation, transmission or consumption facilities currently in study or construction phases.

Open Access

A regulatory regime in which trunk transmission and subtransmission system facilities can be used by third parties under non-discriminatory technical and economic conditions for all users by means of payment made to the corresponding power transmission system. Only transmission lines making use of the rights of way referred to in Article 77 of the General Electricity Services Law and those that use national public use assets will be entitled to use the open access regulatory regime.

Planning and Development Directorate (PDD)

The PDD is responsible for coordinating actions to enable compliance with the provisions of the technical standards when connecting a facility to the TS. These actions include the following, among others:

  • a) Coordinating and guaranteeing communications between the principals of new power generation, transmission or consumption projects, that have not yet been interconnected to the respective electricity system, and the Coordinated Parties and Members of the corresponding CDEC, as well as their respective Technical Directorates.
  • b) Analyzing and determining optimum connection points to the Trunk Transmission System considering new power generation, transmission and consumption projects based on service quality and safety criteria, to ensure technically and economically optimal connections to the IS.
  • c) Executing audits required to guarantee open access to facilities of the respective Interconnected System.

Protection Relay

A physical device or functional element of this device responsible for detecting a certain type of fault or abnormal condition at a power facility by analyzing and processing the variables measured at the facility. This device is able to decide to change output status depending on a pre-determined criteria.

Protection Scheme

This is a set of protection relays that may or may not include teleprotection functions. In addition, this includes oscillographic records and event records.

Regulated Customer

A Distribution Company or user of connected power equal to or less than 2,000 kW supplied from power generation or transmission facilities.

Sectioning substation, substation

A set of equipment that enables a transmission line to be sectioned at an intermediate point of this line. The minimum configuration is comprised of three circuit breaker bays with their respective protection systems.

Service Quality and Safety Technical Standard (NT)

According to the provisions of the General Electricity Services Law and its current regulations, the general purpose of the Service Quality and Safety Technical Standard is to establish the Service Quality and Safety requirements for interconnected systems. Current version dated July 2014 and Exempt Resolution 586 dated 17 November 2014.

Subtransmission System (STxS)

A system comprised of transmission lines and electricity substations that are interconnected to the Transmission System and arranged to exclusively supply groups of free or regulated end consumers that can be identified a territorial level and are found in distribution company concession zones.

Toll

This corresponds to payment a facility owner is entitled to for rights of way or transmission easement applied by those making use of said facilities.

Transmission System (TS)

A set of transmission lines and electricity substations that make up part of a power grid, including interconnection lines between interconnected systems at a nominal voltage level greater than 23 kV, understanding voltage provided by the highest voltage busbar as nominal voltage at the substation. Each Transmission System includes TTS, STxS and ATS facilities.

Trunk Transmission System (TTS)

A system comprised of transmission lines and electricity substations that are economically efficient and necessary to enable the provision of all TS demand, under different power generation facility availability scenarios, including contingency and fault situations, considering stable service quality and safety requirements established in the General Electricity Services Law, regulations and technical standards.

Under Construction Declaration

New projects in the construction stage when these have been granted the respective civil works construction permit, or if the order to proceed to manufacture and install the corresponding electrical or electromagnetic equipment has been extended for power generation, transmission or transformation, which shall be backed by the respective purchase orders for the manufacture of electricity generators, power transformers, conductors and elements for transmission lines, among others, as required. See articles 31 to 33 of Decree 86, Knot Price Regulations.