Title:
METHOD OF PROTECTING PARALLEL OPERATION OF UNINTERRUPTIVE POWER UNIT
Document Type and Number:
Japanese Patent JPH06121461
Kind Code:
A
Abstract:
PURPOSE: To provide a highly reliable protection method which can reduce the drop of the power efficiency in parallel operation of an uninterruptive power unit.
CONSTITUTION: At parallel redundant operation of an uninterruptive power unit, each arm of an inverter 5 is provided with fuses 22u-22z, and if it detects a short circuit 10, it cuts off a faulty uninterruptive power unit from a sound parallel operation apparatus by turning off a changeover circuit by this detection signal, and also, turning on or turning off the switching elements 18u, 18y, 18w, 18y, and 18z of the U, V, W, Y and Z phases excluding the short-circuit arm of, for example, X phase with proper timing.
Inventors:
MAEKAWA HIDEHIRO
HAYAMIZU KAZUO
HAYAMIZU KAZUO
Application Number:
JP26901392A
Publication Date:
April 28, 1994
Filing Date:
October 08, 1992
Export Citation:
Assignee:
MEIDENSHA ELECTRIC MFG CO LTD
International Classes:
H02H7/122; H02J3/38; H02J9/06; (IPC1-7): H02J3/38; H02H7/122; H02J9/06
Attorney, Agent or Firm:
Fujiya Shiga (1 person outside)
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