WHY USE MAINS PROTECTION?
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With an increase in decentralised energy sources such as Diesel Generator Sets, Photovoltaic plants and other alternative sources, the distribution system becomes less stable. It becomes more common to see fluctuations in frequency, voltage and other parameters. To minimise the impact and disturbances to the electrical network it is essential that all Energy sources over a certain size (in most of Australia over 30kW) have mains protection.
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When making an application to connect (if your system is above 30kW three phases or 10kW single phase) the Distribution Network Service Provider (DNSP) will insist on secondary protection to be provided. This will be in addition to the in built protection offered by AS4777 compliant inverters. They will insist that the protection relay shall be certified to IEC 60255, G59 or other product standards.
THE BENEFITS TO YOU CLIENTS:
1. Compliance to local regulation.
2. Compliance with technical conditions of DNSP.
3. Prevents damage to the generator/Photovoltaic
system caused by grid disturbances.
4. Minimise damage to equipment as a result of power
being source outside of parameters.
5 Reduction of downtime due to disconnection of
interuption.
THE BENEFITS TO YOUR DNSP:
1. Provides safe working conditions for network
workers upon grid disconnection.
2. Ensures safe balanced network of the
distribution system.
3. Guarantees reliable delivery of high quality
electricity.
5. Enables remote control of power supply
sources.
1. Provides safe working conditions for network workers upon
grid disconnection.
2. Ensures safe balanced network of the distribution system.
3. Guarantees reliable delivery of high quality electricity.
4. Enables remote control of power supply sources.
WHY ARE PROTECTION RELAYS IMPORTANT?
THE BENEFITS TO YOUR DNSP:
- Protect the generating units from mains disturbances.
- Disconnect the generator from the grid as soon as a failure is detected.
- Prevent distribution network from failure.
- Maintain the quality of power delivered to all users.
1. Select the protection appropriate to the installation DNSP
2. Determine the switching capacity required from 5 predertermined sizes or provide us with your specification.
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3. Determine the appropriate AC combiner box for all your inverters.
(Standard arrangment PVAC61, for 6 x 3 Phase inverters with 250A total)
4. Order parts, or consider asking about the prewiring & assembly of enclosures.
5. Mount the protection cubicle and combiner boxe where required.
6. Wire from inverter to combiner box.
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7. Wire drom protection cubicle to Main switchboard.
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8. Input setpoints for protection as agreed with the DNSP.