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Type Tested Equipment


You need to obtain all the above, when importing your power generating equipment into the United Kingdom.

This has become much more difficult to obtain, given that all the above areas of implementation are now governed by Engineering Recommendations G99/1-6 and without adhering to these (ERs) your equipment will not gain parallel grid connection.

ER G99/1-6 is intended to address all aspects of the connection process from standards of functionality to site commissioning, such that Customers, Manufacturers and Generators are aware of the requirements that will be made by the local DNO before the Power Generating Facility will be accepted for connection to the Distribution Network.

The guidance given within ER G99/1-6 is designed to facilitate the connection of Power Generating Module(s) whilst maintaining the integrity of the Distribution Network, both in terms of safety and supply quality. It applies to all Power Generating Module(s) within the scope of Section 2, irrespective of the type of electrical machine and equipment used to convert any primary energy source into electrical energy.

Developers and generation equipment suppliers.

Developers and generation equipment suppliers need to be aware of the new G99/1-6 regulations in order, to ensure their products have the capability to meet these higher performance requirements.

And this is where Save Electricity can make this process easier for any importer from any Country, we can obtain Type Testing for your equipment and will register that equipment to the relevant authorities, we can also obtain connectivity with any of the Distribution Network Operator in the UK.

And as part of our package of services, we can also carry out any on site witness tests, that the DNOs may still request even after we have obtained full Type Testing, as they have the authority to request any such test.

A Type Tested Interface Protection has its protection settings fixed during manufacture. The regulations define Type-Tested Equipment as “a product which has been tested to ensure that the design meets the relevant requirements of G99/1-6.” All similar products will be built to the same exacting standards and meet the same levels of performance. 

Non-Type Tested Interface Protection systems need additional testing and measurements to assure the regulator that the protection you are using is robust enough.

When obtaining an understanding of G99/1-6 you will also need to be mindful about all the following areas that UK DNOs are showing growing interest in “as shown below”

Frequency Response Requirements

Generators must now control their active power output in response to frequency changes on the grid. The frequency response requirements are divided into two modes: Limited Frequency Sensitive Mode (LFSM) and Frequency Sensitive Mode (FSM).

Limited Frequency Sensitive Mode requires that generators decrease their active power output (MW) if the frequency rises over 50.4Hz and increase their active power output if the frequency falls below 49.5Hz.

Whereas Frequency Sensitive Mode (FSM) is a more onerous requirement for larger generators that requires the installation of a fast acting proportional frequency control device that can respond to frequency changes and can quickly ramp up or ramp down active power by 10%.

Fault-Ride-Through Requirements

Generators over 1MW must now remain connected to the grid when there are significant voltage depressions due to faults on the grid. This is known as fault ride through capabilityand helps avoid blackouts occurring on the grid by ensuring that if one generation site trips out due to a fault it does not take out other generation sites along with it.

The depth of the voltage depression that a generator must remain stable for varies depending of the generator size, with the largest generators needing to ride through a complete loss of voltage for 140ms.

Fast Fault Current Injection Requirements

Generators over 1MW also need to support the system during a fault by quickly injecting reactive current in order, to keep the grid voltage from dropping too low. Again, this capability helps avoid losing further consumers and generation sites during faults by ensuring the grid voltage is kept as high as possible.

Voltage Control Requirements

G99/1-6 requires that generators have a voltage control system that can inject or absorb reactive power into the grid to control voltage. The DNO will instruct the generator to operate in one of three modes: Voltage Control; Reactive Power Control; or Power Factor Control.

Reactive Power Capability

The reactive power capability requirements for generators have also been enhanced. For Power Generating Modules between 1MW and 10MW when operating at registered capacity they must be capable of continuous operation between 0.95 lagging to 0.95 leading power factor at the connection point.

Generators larger than this have specific reactive power capability windows that they must be able to operate (at all points) within.

Save Electricity can obtain Type Testing approval as well as consult on any import of power generating equipment you are bringing into the UK.

If you just need more training and general information regarding G99/1-6 or G98/1-2 why not visit our online training portal where you can view the information in English, German, French, Spanish or Italian.

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