Condition Monitoring of Electrical Cables as Installed in Industrial Processes

• US 20080015817A1
• Filed: 07/23/2007
• Published: 01/17/2008
• Est. Priority Date: 05/14/2002
• Status: Active Grant

• Current Assignee: Analysis And Measurement Services Corporation
• Original Assignee: Analysis And Measurement Services Corporation
• Inventors: Hashemian, Hashem
• Granted Patent: US 7,478,010 B2
• Time in Patent Office: Days
• US Class Current: 702/183
• CPC Class Codes: G05B 23/0283 Predictive maintenance, e.g. involving the monitoring of a system and, based on the monitoring results, taking decisions on the maintenance schedule of the monitored system; Estimating remaining useful life [RUL] preventive maintenance, i.e. planning maintenance according to the available resources without monitoring the system G06Q10/06

Abstract

A system and method for verifying the performance and health of wire systems and end devices, including instruments and processes. A computer runs software that collects data from sampled sensors, stores the data, screens the data for outliers, analyzes the data, performs in situ testing, and generates results of the analysis and testing. The system and method verifies not only the steady state performance of instruments, but also the dynamic performance of instruments and the transient behavior of the processes. In one embodiment, the system performs testing of the wiring system connecting the end devices located at the process. In another embodiment, the system also performs analysis of the amplitude probability density and a power spectral density determined from the sensor, or end device, data. In still another embodiment, the system performs a time domain reflectometry (TDR) analysis for a wiring system connecting an end device.

Claims

1. A method for verifying the performance and health of a plurality of instruments and processes, said method comprising:

sampling data from a plurality of sensors, said sampled data corresponding to a plurality of signals each representing an output from one of a plurality of end devices as measured at the end of a cable;

storing said sampled data;

analyzing said sampled data, said step of analyzing including performing at least one analysis selected from a group including an analysis of an amplitude probability density, an analysis of a power spectral density, and an analysis of a time domain reflectometry; and

determining whether a corrective action is required by said analysis results; and

initiating said corrective action if determined to be required.

2. The method of claim 1 wherein said step of analyzing includes performing at least one of a static analysis and a dynamic analysis.

3. The method of claim 1 wherein said step of analyzing includes performing a static analysis and a dynamic analysis.

4. The method of claim 1 further including a step of screening said sampled data after said step of sampling data.

5. The method of claim 1 wherein said corrective action includes at least one of an instrument calibration and an in situ test.