Kehui Click for PDF File

The company was founded in 1991 as a joint venture with a major US organisation, before becoming independent in 2005. It has utilised the best of Asian, European and American expertise to develop a selection of cable and transmission line fault locators. Subsequently, it produced an extensive range of electricity distribution automation equipment including GPS synchronisation, remote terminal units and SCADA systems. Substation digital fault recorders complete the T&D equipment catalogue.
 

FTR-100 Click for PDF File

Power system digital fault recorders (DFR) automatically and accurately record the pre-fault and post-fault electrical quantities when a disturbance occurs. Through analysis of the waveforms and the events, the reason behind the disturbance can be determined and the correct operation of the protection can be verified. The FTR-100 power system transient recorder provides transient, steady state and continuous recording of the primary equipment and is applicable to both conventional and digital substations.

The FTR-100 power system fault transient recorder is applicable to conventional and digital substations. In the former, the recorder performs transient, steady state and continuous recording of the AC/DC analogue quantities and digital status from the primary equipment. The unit will store 7 days of data under normal conditions, but a wide variety of trigger conditions will allow it to store up to 5.5s of data before and after the trigger event.

The unit also supports the IEC61850 standard, both on the process bus and station bus level. In such digital substations, it monitors, captures and records Sample Values (SV) and GOOSE messages on the process bus, plus MMS messages on the station bus. It checks the integrity of the message for abnormality and performs error-reporting. Through SV and GOOSE messages, it provides monitoring of the analogue quantity and circuit breaker status information within the substation.

T-P22 ve T-P23 Click for PDF File

The Kehui T-P22 and T-P23 have been designed for locating all types of low voltage cable fault, but especially the difficult and troublesome transient and intermittent fault. It is especially suitable for branched cables. The difference between the two devices is the T-P22 has a current channel in addition to the three voltage channels. This can be useful to detect the direction of current flow.
 

• Remotely controllable TDR and Disturbance Recorder designed specifically for low voltage power cable fault location.
• Locates permanent, intermittent and transitory faults.
• Safe connection to energised cables via heavy duty fused test leads.
• Local interrogation through a Bluetooth connection to a PC or Android device.
• Internal GSM/GPRS modem allows control and interrogation from anywhere in the world.
• Storage of the last 20 events with 64 TDR traces (30 pre-fault and 34 post-fault) plus 10 cycles of AC voltage waveforms.
• Triggered from voltage distortion.
• Used in conjunction with additional devices it can provide a 3-phase voltage gradient fault location system. Two, or more, units can be configured to operate as a quasi-synchronous Travelling Wave Fault Location System.
  
   

T-L300 Click for PDF File

In many applications, precise information about the position of buried utility lines is essential so they can be avoided during groundwork. Plans, if available, will help but may be inaccurate. The T-L300 provides a direct method of identifying the location of pipes and both live and dead cables. The use of a variable frequency transmitter allows the detection of pipes and dead cables without interference from separate mains frequency utilities. The system is suitable for route tracing, depth measurement and cable identification, where several cables are grouped together.
 

• Directly displays the pipe position and any deviation to the left or right of the route.
• Current direction measurement to avoid interference from adjacent cables.
• Real time depth and current measurements.
• Light-weight with intuitive user interface.
• High power transmission and high sensitivity receiver.
• Depth measurement greater than 10 meters.
• Optional Global Navigation Satellite System (GNSS) utilising L1 and L5 signals for accurate positioning and distance measurements.
• Optional Bluetooth communication module for transmitting test data to a local PC or tablet.
  
   

T-305E Click for PDF File

The T-305E high voltage surge generator, is used for locating high impedance and flashing faults on distribution cables. It works in conjunction with a cable fault locator for pre-locating the fault position and then with a pinpointer to find the precise fault location. It is applicable for different cable fault location techniques, such as the impulse current method (ICM) and the secondary/multiple impulse method (SIM/MIM).

The equipment consists of a capacitor bank, an in-built voltage transformer and a rectifier, switchable to achieve different capacitance and voltage levels. When the unit is switched-off, its automatic and manual discharge facilities removes any residual capacitive charge. Additional Earth/Ground detection circuitry, blocks the operation of the unit if an effective Earth/Ground connection is not in place. These features, together with safety interlocking, ensure safe, reliable and easy-to-use operation.

The T-305E also provides repetitive discharges to facilitate pinpointing through the detection of the magnetic field and audio signals related to the fault discharging.

T-506 Click for PDF File

The T-506 is used together with a high voltage surge generator, to pinpoint high resistance and flashover faults on power cables. It utilises an Application (App) running on an Android device, connected wirelessly to a hand-held sensor. The sensor detects magnetic and audio signals emanating from the faulted cable. Although most Android tablets can be used, a pre-programmed, ruggedised device, with a hands-free neck strap, is available from Kehui.