XC-21 Overhead Line Fault Locator

XC-21 Overhead Line Fault Locator

Introduction:

The XC-21 Overhead Line Fault Locator operates on the traveling wave principle and provides an accuracy of 500m. It can be applied to high voltage AC lines from 110-500Kv with the line length up to 600Km to precisely measure the fault location. It can also be used on high voltage DC lines. And it has been successfully installed on the HVDC transmission lines between Shanghai and Gezhouba in China.

The XC-21 provides three different modes of fault location: single-ended, double-ended and breaker initiated.

For single-ended mode, only one unit XC-21 is needed, the fault distance is proportional to the time interval of fault arc traveling between substation busbar and fault location.Two units of XC-21 and a GPS are needed to allow the XC-21 to operate in a double-ended mode. The fault distance can be calculated by the time to the double ends of the line.

Specifications:

• Line measured1-8, expandable to monitor up to 16 circuits
  Length measured: 600 km
• Current input: 24, 3 for each line
  Input nominal
  current: 5A/1A
  Current loop load: <0.4VA (In=5A); <0.2VA (In=1A) Current loop overload capacity: 40 times of nominal current value, 1 second
• DI: 2
• DO: 2 dry contact
  Contact Capacity: 28VDC/2A, 250VAC/0.5A
• Sampling length: 4K
  Time interval for two continuous triggering: <50ms
  Fault time that can store: 1000 times
• Measuring accuracy: <500m
• Output: RS232
  Baud rate: 1200, 2400, 4800, 9600 and 19200 optional
• Power supply: 20010%V, AC/DC
• AC operating frequency: 50/60 Hz
• Operating temperature: -10-+50
• Dimension: 437mm*318mm*177mm

Features:

• Travelling wave based fault location.
• Wavelet analysis technology.
• Full remote control and interrogation facilities.
• System unaffected by errors of impedance type locators.
• Locates phase-to-phase, phase-to-ground and open circuit faults.
• The locating accuracy is 500m maxim.
• High speed data acquisition.