Summary of Contents for KEHUI T-305E
- Page 1 T-305E High Voltage Surge Generator User Manual Kehui International Ltd. 2 Centrus, Mead Lane, Hertford Hertfordshire, SG13 7GX United Kingdom Phone: (+44) 1920 358990 Fax: (+44) 1920 358991 Website: http://kehui.com...
- Page 2 Legal Notices The copyright of this material belongs to Kehui International Ltd. No company or individual may extract, copy or translate in any way without the written permission of the copyright owner. Copyright infringement will be investigated. This product complies with the design requirements for environmental protection and personal safety.
- Page 3 Foreword Thank you for purchasing the new product of Kehui - T-305E, the high voltage surge generator (hereinafter referred to as T-305E) The T-305E is a high-performance high voltage surge generator with a maximum output voltage of 32kV and with versions providing a maximum surge energy of 1024J or 2048J. It is used for pre-location and pinpointing of high impedance and intermittent flashing faults of underground power cables.
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Page 4: Table Of Contents
Performing the Test ......................... 19 Power off the T-305E ....................... 20 PINPOINTING FAULTS USING THE CYCLIC MODE ..............20 SHEATH FAULT LOCATION USING THE KEHUI T-H200 ............22 SHUT-DOWN PROCEDURE ..................... 23 MAINTENANCE AND TROUBLESHOOTING ................23 PACKING LIST - T-305E PACKING LIST.................. 24... -
Page 5: Safety Instructions
Indicates that this is a useful guideline based on field practice. Use of Please be sure to use Kehui’s spare parts to ensure the safe and reliable use accessories: of this instrument. Using accessories made by other companies will make any warranty null and void. -
Page 6: Product Overview
Main use and scope of application T-305E is used together with Kehui’s power cable fault locator T-906 and pinpointer T-506, to pre-locate and to pinpoint underground power cable faults The equipment consists of voltage conversion and rectification to produce high DC voltage for the test. -
Page 7: Technical Data Sheet
120kg for 2048J version HV Cable length 3.6m Ground cable length Working ground cable 1.1m Discharge rod cable Power cable 1.8m Operating temperature C to +50 Storage temperature C to +60 Ingress Protection IP21 T-305E User Manual Version 3.5 | 7... -
Page 8: Working Principle
3.1. The switch S1 can be controlled by a timer to give periodic surges required for pinpointing. Note: References to earth/earthing and ground/grounding are used throughout and are interchangeable. Figure 3.1 Surge Generator schematic diagram T-305E User Manual Version 3.5 | 8... -
Page 9: Dc Operation
DC mode can also be used to power a sheath fault locator, such as the Kehui T-H200. Using the surge generator for this application makes it unnecessary to use a separate power source such as the Kehui T-100C. -
Page 10: Low-Voltage Cable Break-Down
The T-305E is available in versions with either 1024J output or 2048J, the disadvantage of the higher value being an increase in the surge generator’s size and weight. -
Page 11: Equipment Construction
The T-305E is fitted with a collapsible shelf, which provides a convenient space to position the Kehui T-906 TDR fault locator. The cables are contained in a bag at the front of the unit. Figure 4.1 T-305E in use, showing wheels, castors, cable bag and shelf User interface Description The user interface is situated on top of the unit. - Page 12 12. Test method switch: To switch between two test methods: Impulse current method (ICM) and Secondary/Multiple impulse method (SIM/MIM). 13. Emergency Stop: In an emergency situation, pressing this button will cut off the power supply and automatically discharge any residual charge. T-305E User Manual Version 3.5 | 12...
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Page 13: Rear Panel Description
Additionally, it must not be clamped together with the auxiliary ground, but connected at a separate point on the substation earth bar. Note: The protection ground and the auxiliary ground must be grounded separately, otherwise the high voltage output cannot start. T-305E User Manual Version 3.5 | 13... -
Page 14: Side Panel Description
Trigger/Signal port: For connection to the trigger/signal port of T-906. For the impulse current method, the output signal is the impulse current. For the secondary/multiple impulse method, the output signal is the secondary impulse, the input trigger is the Time Domain Reflectometry (TDR) pulse. T-305E User Manual Version 3.5 | 14... -
Page 15: Getting Started
This is the Working Ground, the zero-volt reference point during the discharge process. Position the T-305E at about 2m away from the faulty cable, and put the cable fault locator on the tray at the side panel for easy operation. -
Page 16: Modes Of Operation
Note: The Protective GND should be electrically separated from the Working GND (GND). This is to protect the shell of the instrument from the inducing voltage during high voltage discharge. This is also to protect the user from being injured in case of any T-305E current leakage. -
Page 17: Fault Pre-Location
TRIGGER/SIGNAL output port of the T-305E. DC flashover method The DC Flashover method requires a DC output from the T-305E which is increased until the fault breaks down, the resulting current flow will trigger the T-906 fault locator. -
Page 18: Impulse Flashover Method
In this case other suitable makes of TDR unit can be used, connected using a suitable current sensor attached to the earth wire on the HV output. If the Kehui T-906 is used, an external current sensor is not required, as it can be directly connected to the TRIGGER/SIGNAL port using the Lemo cable supplied. -
Page 19: Secondary/Multiple Impulse Method (Sim/Mim)
(see section 5.1 Using the discharge rod) DC Voltage Withstand Test For power cables rated at 6kV or below, after the fault has been repaired, the T-305E can be used to perform a DC voltage withstand test. -
Page 20: Power Off The T-305E
This mode is used for pinpointing the fault position of the cable using the Kehui T-506 pinpointer or any similar device . In this mode, the T-305E will discharge to the cable at a frequency determined by the TIME dial setting. The flow of current through the fault point as it breaks down, generates periodic magnetic and acoustic signals, which can be picked up by the T-506 pinpointer for precise location of the fault. - Page 21 Operational procedure: Turn the MODE knob to the PULSE position. vii. Power on the T-305E, the POWER indicator lamp will light-up. viii. Turn the voltage ADJUST knob to the zero position, otherwise the START is disabled. Press the START button. The red START button will light up, whilst inside the instrument the noise of the HV protective device can be heard.
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Page 22: Sheath Fault Location Using The Kehui T-H200
Sheath Fault location using the Kehui T-H200 Note that the Kehui T-100C is the preferred power source for the T-H200, however it will also work with other suitable high voltage sources and can be powered from the Kehui T- 305 surge generator, used in DC mode as explained above. Connections are shown below: Figure 9.1 T-305 Connections to the T-H200... -
Page 23: Shut-Down Procedure
Shut-Down Procedure The T-305E has an internal high voltage discharge device, which will directly short circuit the cable, capacitor and ground terminals of the instrument when the power is off. If the power is shut off directly, without following the procedure below, the residual electric energy stored in the cable and the capacitor will discharge through this device. -
Page 24: Packing List - T-305E Packing List
High Voltage Surge Generator including integral Alternative 15.01.3224 3.6m HV cables (2048J) to item 1 05.27.2090 Grounding pin Power Cable 05.35.2114 Discharge Rod 05.34.2109 Discharge Rod Cable Manual Test certificate QC Pass certificate Adaptor T-305E User Manual Version 3.5 | 24...