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G99 Relay Testing And Compliance

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G59 Projects Ltd
G99 Relay Testing And Compliance

The ways of power production in the UK have been changing in recent years. We are now shifting from large, fossil fuel-powered plants to renewable energy suppliers that are smaller and more sustainable. These new ways of producing power reduce our reliance on fossil fuels which is terrible for the environment.

To commit to using renewable power sources, the UK government introduced G99 in April 2019. G99 application is important legislation and regulation that suggest specific operational and technical requirements to all electricity providers who wish to continue their power supply to the network.

G99 will impact how you connect to the network and interact with regulators, whether using wind, solar, or hydroelectric power to produce electricity. Here are the details of immediate changes and challenges you might face after implementing G99 regulations.


What Is G99?

As you know now, Uk relies on a large number of small-scale renewable energy providers rather than depending on the fewer large-scale energy providers. These changes in the number of suppliers make the network less stable. The stability in the network is essential to keep the generator and the grid safe.

On 27 April 2019, the Energy Networks Association (ENA) launched G99, which changes how generators can be connected to the grid. To provide safety to the network the relay is installed in the system to provide safety to the network, which offers crucial protection. The relay is attached between the generator and the grid and can decouple the system if a problem arises. 

These regulations are generally known as EREC G99. G99 has created a safe, sustainable, and competitive market for electricity. An existing operator can continue to work as usual but must follow the G99 regulation. Power generation systems commissioned before 27 April 2019 can work as they were working before.


Types Of Connection:

G99 regulations classified electricity generation and storage systems into four following types.

  • Type A Generators or storage: < 1MW and < 110kV
  • Type B Generators or storage: 1MW - 10MW < 110kV
  • Type C Generators or storage: 10MW - 50MW < 110kV
  • Type D Generators or storage: 50MW + < 110kV


Types Of Relay: 

There are two types of relays accepted under regulators under G99. 

  • Type Tested Interface Protection: A Type Tested Interface Protection comes with all the protection settings before reading to the site. These settings are fixed during the manufacturing process. All the connecting components are also manufactured with the same standard and match the same performance level. These products ensure that they meet every design requirement of G99.
  • Non-Type Tested Interface Protection: The Non-Type Tested Interface Protection systems require more measurements and testing to ensure that your existing protection is strong enough.


Do You Need To Test Your Relay?

You need to test your relay in the following conditions:

  • Calibration and stability tests on the overvoltage and under-voltage protection for each phase.
  • Calibration and stability tests on the over-frequency and under-frequency protection.
  • Calibration tests for the rate of change of frequency protection.

There are more straightforward ways to ensure your station is G99 compliant. You can connect with reputable suppliers. The component manufacturer will connect the distribution networks with G99-compliant components like s relay panels, UPS panels, and other devices. These components will configure your power station and make it stable.

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