Chapter 10-Disturbance Monitoring (Access 9360); About Disturbance Monitoring - Siemens ACCESS 9340 Reference Manual

PMCM-9340D-0208
2/2008
CHAPTER 10—DISTURBANCE MONITORING (ACCESS 9360)

About Disturbance Monitoring

© 2008 Siemens Energy & Automation, Inc. All Rights Reserved.
This chapter gives you background information about disturbance
monitoring and describes how to use the ACCESS 9360 to
continuously monitor for disturbances on the current and voltage
inputs. It also provides an overview of using ION Setup and
WinPM.Net to gather data when a disturbance event occurs.
Momentary voltage disturbances are an increasing concern for
industrial plants, hospitals, data centers, and other commercial
facilities because modern equipment used in those facilities tends to
be more sensitive to voltage sags, swells, and momentary
interruptions. The meter can detect these events by continuously
monitoring and recording current and voltage information on all
metered channels. Using this information, you can diagnose
equipment problems resulting from voltage sags or swells and
identify areas of vulnerability, enabling you to take corrective action.
The interruption of an industrial process because of an abnormal
voltage condition can result in substantial costs, which manifest
themselves in many ways:
•
labor costs for cleanup and restart
•
lost productivity
•
damaged product or reduced product quality
•
delivery delays and user dissatisfaction
The entire process can depend on the sensitivity of a single piece of
equipment. Relays, contactors, adjustable speed drives,
programmable controllers, PCs, and data communication networks
are all susceptible to power quality problems. After the electrical
system is interrupted or shut down, determining the cause may be
difficult.
Several types of voltage disturbances are possible, each potentially
having a different origin and requiring a separate solution. A
momentary interruption occurs when a protective device interrupts
the circuit that feeds a facility. Swells and overvoltages can damage
equipment or cause motors to overheat. Perhaps the biggest power
quality problem is the momentary voltage sag caused by faults on
remote circuits.
Chapter 10—Disturbance Monitoring (ACCESS 9360)
ACCESS 9340 and 9360 Meters
EN–107