KEHUI T-305E User Manual Download

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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

Summary of Contents for T-305E

Page 1: ...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: ...rnational Ltd website http www kehui com Disclaimer Every effort has been made to make this material complete accurate and up to date In addition changes are periodically added to the information here...

Page 3: ...lt locator to pre locate cable faults T 305E supports the Secondary Multiple Impulse Methods SIM MIM and the Impulse Current Method ICM for fault pre location T 305E works in conjunction with the T 50...

Page 4: ...n 11 4 2 Rear Panel Description 13 4 3 Side Panel Description 14 5 GETTING STARTED 15 5 1 Using the discharge rod 15 5 2 Wiring connection 15 5 3 Modes of operation 16 6 FAULT PRE LOCATION 17 6 1 DC f...

Page 5: ...tes a potential hazard that could result in fatal or serious injury Indicates a potential hazard which if not avoided may result in minor personal injury or property damage Indicates that it contains...

Page 6: ...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...

Page 7: ...from 0 to 8kV Impulse energy 1024J 32kV 2 F 16kV 8 F 8kV 32 F 2048J 32kV 4 F 16kV 16 F 8kV 64 F Operating mode DC Pulse Cyclic Testing method SIM MIM ICM Discharge period 4 15s adjustable continuously...

Page 8: ...afety discharge feature When the equipment is powered off the selected capacitors and the cables will be connected to earth ground through the safety facility This works by closing the switch S2 which...

Page 9: ...C 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...

Page 10: ...shown in the red curve causes a breakdown after around 4 s The increase in capacitance serves to increase the energy delivered in the surge allowing the breakdown to be achieved at a lower voltage wh...

Page 11: ...ice heavier and slightly taller see section 2 6 Technical data 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...

Page 12: ...arge switch will operate The red start indication will be on and the green stop indication will be off 8 Mode Allows the selection of DC pulse or cyclic modes of operation 9 Surge When the pulse mode...

Page 13: ...grounding points are not available the protection ground can also be connected to the substation earth bar but it must be as far away as possible from the point where the working ground is connected...

Page 14: ...ice ii 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 outp...

Page 15: ...ion discharge iii After the air ionisation discharge becomes weak the point of the rod can make contact with the HV test item directly At this time the item will be discharged through the discharge re...

Page 16: ...scharging the voltage of the working GND point will be raised to thousands of volts in a second If the Protective GND is not separated from the Working GND the high voltage may transmit through the pr...

Page 17: ...tive maintenance tests belong to this category The waveform obtained by the DC Flashover method is relatively easy to interpret However the resistance of the fault point will decrease after several di...

Page 18: ...ault If the fault does not break down raise the voltage further and repeat the process until break down occurs vii The swing of the pointer of the kV meter will indicate the fault status A small swing...

Page 19: ...then lights up and the green STOP light turns off Inside the instrument the noise of the HV protective device can be heard vii Turn the ADJUST knob slowly until the voltage rises to the chosen value p...

Page 20: ...Power off the T 305E After the test is finished turn the ADJUST knob to zero to discharge the cable The T 305E can then be powered down Warning The power off procedure for DC Voltage Withstand Test i...

Page 21: ...ation is successful xi Switch the mode switch to CYCLIC and set the required pulse time on the clock by rotating the dial The allowable time setting is dependent on the voltage set on the unit The cap...

Page 22: ...START will not work iv Press the START button The red START light comes on and the green STOP light turns off The sound of the HV protective device inside the instrument can be heard v Slowly rotate...

Page 23: ...from the power socket first and then remove the plug on the back panel of the T 305E 11 Maintenance and troubleshooting When the following conditions happen it is mostly likely caused by an incorrect...

Page 24: ...tor including integral 3 6m HV cables 1024J 1 15 01 3231 1a High Voltage Surge Generator including integral 3 6m HV cables 2048J Alternative to item 1 15 01 3224 2 Grounding pin 2 05 27 2090 3 Power C...