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(i) The basic design parameters for the circuit are:
I
b >
I
g where
I
b is the design current and Ig is the rated output current of the Ecogen
I
n >
I
b where In is the nominal current of the overload protective device
Disconnection of the final circuit in the event of an earth fault on the circuit and deenergising of the Ecogen should both occur within an overall maximum time of
0.4 s for TN systems and 0.2 s for TT systems. However, if the protective device for automatic disconnection in case of an earth fault disconnects line and neutral
conductors, it is not necessary to take account of the time taken for the Ecogen to deenergise.
(ii) Where an Ecogen is connected on the same side of an RCD as final circuits protected by that RCD, the RCD must disconnect the line and neutral conductors.
(iii) The Ecogen must be provided with means of isolation and of switching off for mechanical maintenance.
16. Connection of a Ecogen to an existing final circuit
(i) The basic design parameters for the circuit are:
I
z >
I
n+
I
g where
I
z is the current carrying capacity of the conductors of the final circuit, In is the nominal current of the overload protective device and
I
g is the rated
output current of the Ecogen. This may require the protective device to be replaced with one having a lower nominal current rating.
Disconnection of the final circuit in the event of an earth fault on the circuit and deenergising of the Ecogen should both occur within an overall maximum time of
0.4 s for TN systems and 0.2 s for TT systems. However, if the protective device for automatic disconnection in case of an earth fault disconnects line and neutral
conductors, it is not necessary to take account of the time taken for the Ecogen to deenergise.
IMPORTANT: In designing a connection for the Ecogen 24/1.0 the electrical installer
has to consider all the issues that would need to be covered for a conventional final
circuit, including:
In Accordance with BS: 7671.
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 over current
isolation and switching
equipment selection and installation issues
The electrical installer should check that the prospective fault current would not
change sufficiently to exceed the fault rating of existing protective devices.
Fig. 13
Fig. 13a
Содержание ECOGEN 24/1.0
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Страница 70: ...page 70 16 2 Milligrid 24 way Connector...
Страница 71: ...page 71 16 3 14 way Connector...
Страница 72: ...page 72 16 4 Engine Circuit...
Страница 73: ...page 73 16 5 Power Monitoring 24Vdc Power Supply...
Страница 74: ...page 74 16 6 External Connections External Wiring...
Страница 85: ...page 87...
Страница 86: ...page 88...
Страница 87: ...page 89 Section P...
Страница 88: ...page 90...
Страница 89: ...page 91 Section Q Engine developing less than 950W after 15 minutes running at maximum rate...
Страница 91: ...page 93 page 94 page 95 page 96 MICRO CHP SYSTEM COMMISSIONING CHECKLIST...
Страница 92: ...page 97...