Скачать или смотреть What is the permissible initial magnetization current for the UPS charger/rectifier input?

Q No 1. What is the permissible initial magnetization current for the UPS charger/rectifier input?
The initial magnetization current shall be limited to 600% of the rectifier/charger's rated input current for a duration of one main cycle.
Q No 2. What is the required kVA rating for a backup generator supplying emergency power to a UPS system?
The backup generator's kVA rating must be at least 2.25 times the rated kVA of the UPS.
Exception:
The emergency generator may be sized at 1.4 times the rated kVA of the UPS, provided that the feedback injection of current harmonics by the UPS rectifier is limited to 5% Total Harmonic Distortion (THD) during all UPS operating conditions.
The UPS system must automatically block (inhibit) battery charging when powered by the emergency generator.
Q No 3. How should UPS loads be distributed?
UPS loads must be distributed through panelboards. Protection for outgoing circuits shall be provided by circuit breakers rated for continuous operation and capable of quickly opening and clearing short-circuit and/or overload conditions.
Q No 4. What is the purpose of a bolted fault test for the UPS distribution system?
A bolted fault test (three phases connected to ground) is conducted on the UPS distribution system to verify proper fuse coordination.
Q No 5. How is the bolted fault test for the UPS distribution system performed?
The test is performed by intentionally creating a bolted fault on a typical branch circuit of the UPS distribution system using a contactor.