APC 9000 Electrical parameters for selecting protective devices, Electrical parameters for Mains

Characteristics

1.4 Electrical parameters for selecting protective devices

The parameters given in the table below can be used to determine the required rating of the source side protective circuit breaker on Mains 1 of a single-unit or modular UPS, a frequency converter, or a parallel UPS with SSC.

Important:

It is essential to choose the type of circuit breaker according to its breaking capacity and the prospective short-circuit current at its place of installation.

Note:

For Mains 1 power supply voltages of 380, 400 and 415 V, the Mains 1 current is the same because it is a function of the DC voltage.

Electrical parameters for Mains 1

rated	Mains 1 current
inverter
	rated current In for unit:		for 25 %	for 50 %
output
			overload (3)	overload (3)
in kVA	with battery at start	without battery (2)
	of charge cycle (1)
800	1555	1329	1819	2183
900	1555	1329	1819	2183

(1)the rated Mains 1 currents (In) have been determined for a rated phase-to-phase voltage of 380 V to 415 V, a battery with a

15 minute backup time (206 cells at 2 V per cell, i.e. 412 V) and at the beginning of its recharge cycle, and full rated load with a power factor of 0.9.

(2)the rated Mains 1 currents (In) have been determined for a minimum float charging voltage of 423 V and full rated load with a power factor of 0.9.

(3)the Mains 1 currents given for an overload of 25 % or 50 % are maximum values. They have been determined for a battery drawing the minimum float charging voltage and a load power factor of 0.9. When choosing the circuit breaker rating, use the "rated current" column and check that the circuit breaker tripping curves are compatible with the values in the overload columns.

The parameters given in the table below can be used to determine the required rating of the source side protective circuit breaker on the Mains 2 line for a single-unit or modular UPS.

Important:

–It is essential to choose the type of circuit breaker according to its breaking capacity and the prospective short-circuit current at its place of installation.

This choice must also be made so as to protect the static switch semiconductors and ensure discrimination with respect to the UPS output fuses (refer to "appendix" chapter).

–For an installation with a Static Switch Cubicle, the Mains 2 currents indicated in the table must be multipled by the number of parallel-connected rectifier-inverter cubicles required to supply the load power (i.e. without taking redundant rectifier- inverter units into account).

Remark:

If the installation includes a transformer on the Mains 2 input, allow for the inrush current caused by magnetization of the transformer windings.

Electrical parameters for Mains 2 (415 V)

rated	Mains 2 current (1)
inverter
	rated current In	for 25 %	for 50 %
output
		overload	overload
in kVA
800	1155	1444	1733
900	1299	1624	1949

(1)the Mains 2 currents have been determined for a rated phase-to-phase voltage of 415V, a load power factor of 0.9 and for full rated load as well as overloads of 25 % or 50 %. When choosing the circuit breaker rating, use the "rated curent" column and check that the circuit breaker tripping curves are compatible with the data in the overload columns.

For a Mains 2 voltage of 380 V, multiply the currents indicated in this table by 1.09.

For a Mains 2 voltage of 400 V, use the table in another language version of this manual.

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