ON-LINE MONITORING SYSTEM OF INSULATION LOSSES FOR UNDERGROUND POWER CABLES

• US 20120299603A1
• Filed: 05/23/2012
• Published: 11/29/2012
• Est. Priority Date: 05/25/2011
• Status: Abandoned Application

• Current Assignee: Electric Power Research Institute Incorporated
• Original Assignee: Electric Power Research Institute Incorporated
• Inventors: Zhao, Tiebin
• Application Number:
  US13/478,979
• Publication Number:
  US 20120299603A1
• Time in Patent Office: Days
• US Class Current: 324/551
• CPC Class Codes: G01R 27/2617 Measuring dielectric properties, e.g. constants testing dielectric strength G01R31/12; detecting insulation faults G01R31/52; G01R27/2688 takes precedence
• CPC Class Codes: G01R 31/1272 of cable, line or wire insulation, e.g. using partial discharge measurements locating faults in cables G01R31/083
• CPC Class Codes: G01R 31/52 Testing for short-circuits, leakage current or ground faults
• CPC Class Codes: G01R 31/58 Testing of lines, cables or conductors testing of electric windings G01R31/72

Abstract

A monitoring system adapted to assess insulation losses of an underground power cable includes a cable circuit having first and second, spaced-apart terminals. The cable circuit is disposed along a section of the underground power cable. The system further includes a communications device adapted to transmit data gathered at the first and second terminals, and a processor adapted to receive and process the data measured at the same time with the synchronization device and transmitted from the communications device.

Claims

1. A monitoring system adapted to assess insulation losses of an underground power cable, comprising:

(a) a cable circuit having first and second, spaced-apart terminals, the cable circuit being disposed along a section of the underground power cable;

(b) a communications device adapted to transmit data gathered at the first and second terminals; and

(c) a processor adapted to receive and process the data from the communications device.

2. The monitoring system according to claim 1, further including at least one voltage transducer positioned at each of the first and second terminals, the at least one voltage transducer being adapted to collect voltage data at each of the first and second terminals.

3. The monitoring system according to claim 1, further including at least one current transducer positioned at each of the first and second terminals, the at least one current transducer being adapted to collect current data at each of the first and second terminals.

4. The monitoring system according to claim 1, further including at least one phase angle transducer positioned at each of the first and second terminals, the at least one phase angle transducer being adapted to collect phase angle data at each of the first and second terminals.

5. The monitoring system according to claim 1, further including at least one temperature sensor adapted to collect temperature data.

6. The monitoring system according to claim 1, further including a power source disposed at each of the first and second terminals to provide power to components located at each of the first and second terminals.

7. The monitoring system according to claim 1, further including at least one signal conditioner adapted to condition data signals generated by transducers located at each of the first and second terminals prior to the data being acquired.

8. The monitoring system according to claim 7, further including at least one data acquisition unit adapted to acquire the conditioned data signals from the signal conditioner and provide the conditioned data signals to the communications device for transmission to the processor.

9. A method of determining insulation losses of an underground power cable, comprising the steps of:

(a) providing a cable circuit having first and second, spaced-apart terminals;

(b) acquiring data signals collected at the first and second terminals;

(c) transmitting the data signals to a processor;

(d) using the processor to process the data signals; and

(e) displaying results of the processed data signals.

10. The method according to claim 9, further including the step of collecting data at the first and second terminals.

11. The method according to claim 10, wherein the step of collecting data is performed using transducers positioned at each of the first and second terminals.

12. The method according to claim 11, wherein the transducers are selected from the group consisting of voltage transducers, current transducers, and phase angle transducers.

13. The method according to claim 9, further including the step of providing a data acquisition unit to acquire the data.

14. The method according to claim 9, further including the step of providing a signal conditioner to condition the data signals.

15. The method according to claim 9, further including the step of providing a synchronization device to measure the data at the same time and a communications device to transmit the data signals to the processor.