Chapter 3 (Part 3) - Metering & Islanding

3.7.3 Electromagnetic emission/Immunity

The MSDG shall comply with the requirements of the EMC Directive and in particular the product family emission standards.

3.7.4 Labels

To indicate the presence of the MSDG within the premises, a label will be fixed by the CEB at:

1. the 22 kV pole on which the switch fuses are installed (or the Ring Main Unit in case of underground networks)
2. the transformer cabin door and/or fence
3. the metering cabin and box
4. the low voltage CEB circuit breaker or fuse
5. the visible lockable isolators 1 and 2, 3 & lockable earth switch and the Joint Use Facility cabin door
6. Any other locations that are found necessary by the CEB.

The installation operating instructions must contain the manufacturer's contact details e.g. name, telephone number and web address.

3.7.5 Documentation

Up-to-date information must be displayed at the MSDG as follows:

1. A circuit diagram showing the relationship between the MSDG and the CEB's circuit breaker/ fused cut-out. This diagram is also required to show by whom the generator is owned and maintained.
2. A summary of the protection's separate settings incorporated within the equipment.
3. Isolation procedures of both CEB and the applicant
4. In addition the maintenance requirements and maintenance services available shall be documented if required.
5. The MSDG Owner shall keep a certificate signed by the maintenance contractor containing at least the following:
   • A statement confirming that the solar PV system/wind turbine/hydro meets the requirements of this grid code.
   • Client's name and address.
   • Site address (if different).
   • Contractor's name, address, contacts etc.
   • List of key components installed.
   • Estimation of system performance
   • Maintenance schedule

3.7.6 Information plate

The following information shall appear on the information plate:

1. manufacturer's name or trade mark;
2. type designation or identification number, or any other means of identification making it possible to obtain relevant information from the manufacturer;
3. rated power;
4. nominal voltage;
5. nominal frequency,
6. phases;
7. power factor

3.7.7 Electrical contractor / Installer

The MSDG shall be installed in accordance with the instructions issued by the manufacturer.

In designing a connection for any MSDG, the electrical contractor /installer must consider all the issues that would need to be covered for a conventional final circuit, including:

• the maximum demand (and the generator output);
• the type of earthing arrangement;
• the nature of the supply;
• external influences;
• compatibility, maintainability and accessibility;
• protection against electric shock;
• protection against thermal effects;
• protection against overcurrent;
• isolation and switching;
• Selection and installation issues.

The installer must affix a label clearly indicating the next scheduled maintenance of the installations and inform the CEB, who will add the information to the MSDG-register.

The installer must be skilled in the field of MSDG installations and possesses an MQA-approved qualification or equivalent in electrical and renewable energy installations (as applicable to the MSDG installation) and which is acceptable to the CEB.

3.8 Metering

In order to enable correct billing of the applicant, a bidirectional meter measuring both the import and export energy shall be installed. Billing will depend on the applicable MSDG scheme. A second meter measuring the gross production of the MSDG shall also be installed. The power cable should fit in the inner diameter of the CT for the production meter and the CT shall be according to IEC 61869-2. The CTs must have sealing facilities.

As regard to the CTs and VTs, the MSDG promoter shall first seek CEB's approval prior to ordering and send same to CEB's Meter Lab Section for tests prior to installation.

In cases where it is not possible to locate the production meter next to the import/export meter, the production meter shall be equipped with a separate modem and SIM card and shall be installed at a convenient location and be easily accessible to CEB officers. The cost of this additional modem and the monthly communication charge shall be charged to the applicant, as well as any faulty metering equipment in the future.

In cases where additional production meters are required due to site specificities, all production meters, including the associated modems, SIM cards and communication charge, shall be charged to the applicant, as well as any faulty metering equipment in the future.

The MSDG promoter shall send the specifications and burden calculations of the proposed CTs and Test Terminal Block (TTB) to the CEB for approval before procurement. Alternatively, the TTB can also be purchased from CEB. Before installation, the CTs shall be sent to the CEB for testing, which will be chargeable to the applicant.

Both Import/Export and production meters shall primarily be CT-connected meters. The CTs used for the Production meter shall have an independent core for metering with accuracy class of 1.

All meters and related equipment (such as CT, TTB, etc.) shall be housed in a secured cabin, as per CEB's requirements.

A metering cabin shall be erected to house the production meter, TTB, CTs and an isolator, as per CEB's requirements.

All metering cabins shall be fitted with a 13A power socket, protected by a 2A circuit breaker and fed from a secured source of supply.

3.9 Testing, Commissioning and Maintenance

Testing of MSDG installations will be done in the presence of the CEB. The MSDG Owner shall notify the CEB in advance with a testing and commissioning plan. The MSDG Owner shall keep written records of test results and protection settings. The MSDG Owner shall regularly maintain their protection systems in accordance with good electrical industry practice and any revision brought to this Grid Code.

3.10 Standards and Regulations

All electrical apparatus, materials and wiring supplied shall comply with the Electricity Act, the Central Electricity Board Act, Electricity Regulations, this code and the following standards:

PV Modules

PV Inverters

Grid-Connected PV System

Wind Turbine Generators

Power Quality

The applicant may be required to produce certificates conforming to the above standards for their MSDG installation upon CEB's request.