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DIFFERENTIAL POWER PROTECTION MODULE

IP.com Disclosure Number: IPCOM000249550D
Publication Date: 2017-Mar-03
Document File: 5 page(s) / 336K

Publishing Venue

The IP.com Prior Art Database

Abstract

A differential power protection module is disclosed. The module is used to measure input and output power continuously in a power distribution unit (PDU), a high frequency power distribution unit (HFPDU) or other alternating current (AC) or direct current (DC) equipment. The input power is monitored by measuring input voltage and current on each of the three phases. Similarly, in each equipment, there are AC or DC input feeders to receive the power and some AC or DC output feeders to send the power. By monitoring voltage and current of each feeder, the module computes an average active power on a short cycle. The average active power is used to compute and record the efficiency of the equipment.

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DIFFERENTIAL POWER PROTECTION MODULE

BACKGROUND

 

The present disclosure relates generally to power distribution unit and more particularly to a differential power protection module.

This is part of the invention. No part of the invention to be included in background. Several conventional differential protection systems are available for protecting power transformers, alternators, and motor windings. However, these conventional differential protection systems are applicable only to alternating current (AC) systems and not direct current (DC) systems.

It would be desirable to have an improved protection system for an equipment having a mechanical and measurable power input and output.

BRIEF DESCRIPTION OF DRAWINGS

Figure 1 is a schematic of a simple three phase rectifier with the differential power protection module.

Figure 2 is a flowchart depicting the working of the distributed power protection module for a three phase rectifier.

DETAILED DESCRIPTION

A differential power protection module is disclosed. The module is used to measure input and output power continuously in a power distribution unit (PDU), a high frequency power distribution unit (HFPDU) or other alternating current (AC) or direct current (DC) equipment. The input power is monitored by measuring input voltage and current on each of the three phases. The protection may be enhanced by adding more current transducers on each output line to measure the output power and to determine the unit efficiency in real time. Similarly, in each equipment, there are AC or DC input feeders to receive the power and some AC or DC output feeders to send the power. By monitoring voltage and current of each feeder, the module computes an average active power on a short cycle. The average active power is used to compute and record the efficiency of the equipment. The module records input and output power data over a few days or months for checking performance of the AC/DC equipment or PDU.

If the module captures efficiency of the AC/DC equipment or unit to be lower than observed in regular conditions or is lower than a predetermined first threshold, the module sends a warning signal to an operator indicating that the system or power unit is not working properly. If the AC/DC equipment or PDU has a broken part or loss in connection, the module records a difference in input and output power demand and sends a signal accordingly. For example, if a power line is touching a tree electrical power dissipates in the form of heat and the arc current is low enough to trip the main breaker. The differential power protection module records that the power line efficiency is lower than the earlier days or the first threshold and sends a warning signal to the operator. If there is a big difference between input and output power, for example more than a second predetermined threshold, then the module disconnects the unit or system from power source in order to protect the system or power unit.

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