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VON MODEL SST15-832 ARC REFLECTION SECTIONALIZING SYSTEM Page 6

V CONTROLS AND INDICATORS

ON- OFF

switch operates the main power.

START

pushbutton - When the "START" pushbutton is pushed the motorized discharge

switch opens, the motorized gap opens, and the high voltage supply begins charging the
internal capacitor bank to the set limit. The “START” pusbutton also toggles the TDR
between arc reflection and radar modes.  In the RADAR position the sentence "WAITING
FOR THUMPER" must appear at the top,   If “WAITING FOR THUMPER” does not show
push the “START” pushbutton a second time. “WAITING FOR THUMPER” indicates the
system is armed and can be triggered by a "thump"  The trigger pulse from the thump starts
the ARC REFLECTION SEQUENCE.  After a very short delay which is controlled by the
DELAY switch, a radar pulse is injected into the faulted cable.  The resulting waveform is
automatically transferred into the bottom trace.

STOP

pushbutton- Drops out the high voltage ready relay which kills the high voltage

supply, closes the motorized discharge device to discharge any internally stored charge,
and after a delay closes the impulse control gap to discharge the output cable.

RADAR/THUMP

pushbutton- Alternates mode of operation between “Radar” or Arc

Reflection for pre-location and “Thump” for pinpointing. When in “Thump” mode, the TDR
screen will go blank, to indicate this..

VOLTAGE ADJUSTMENT

knob - adjusts the discharge voltage from a low value to the

maximum voltage of 15kV.

GAIN

button - Provides manual vertical gain adjustment from 0 to 20 dB by using the up

and down arrow keys

OPTIONS

pushbutton - Pressing the OPTION key presents a menu of available options

such as delay and left starts. This button is not normally used during operation.

RANGE

pushbutton- allows the operator to use the arrow buttons to change the range. The

width of the transmitted pulse is adjusted automatically when the range is changed.  When
the power is turned on, the unit will automatically attempt to find the end of the cable and
select the appropriate range.  If the software is unable to identify the end of the cable,  the
default (normally 1500 foot/500m) range is automatically selected.  The current range is
displayed in the bottom right hand corner of the screen.

ARROW

/

pushbuttons- Changes the function where the “brick” or onscreen is

located.

RIGHT MARKER

pushbutton - Allows the operator to use the arrow buttons to move the

right vertical line. The vertical line on the right of the display that sets the end point for all
measurements.

LEFT MARKER

pushbutton - Allows the operator to use the arrow buttons to move the left

vertical line. The vertical line on the left of the display sets the beginning point for all
measurements. When the radar is turned on the left marker is put at the saved end of the

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Содержание SST15-832

Страница 1: ...OPERATING INSTRUCTIONS FOR MODEL SST15 832 Arc Reflection Sectionalizing System THE VON CORPORATION 1038 LOMB AVENUE P O BOX 110096 BIRMINGHAM AL 35211 TELEPHONE 205 788 2437 FAX 205 780 4015 ...

Страница 2: ......

Страница 3: ...CONTROLS AND INDICATORS 6 VI F SECTIONALIZING URD LOOP SYSTEMS 8 VI B HINTS AND TYPICAL TRACES 10 VI E TESTING AN ISOLATED CABLE 13 VI G RADAR OPTIONS MENU 13 VII IN CASE OF DIFFICULTY 13 VIII TEST LEADS BATTERY MAINTENANCE AND STORAGE 14 IX CIRCUIT DIAGRAM AND PARTS LIST 15 X RADAR THEORY 16 XI THEORY OF ARC REFLECTION METHOD 17 XII CABLE DISTANCE MEASUREMENTS 18 ...

Страница 4: ...l with us so that we may share them with all VON users through application notes and instruction manual changes Please keep us informed of the names of personnel to receive application notes and instruction manual changes For any questions concerning this equipment or its application write or call The VON Corporation SHIPPING ADDRESS P O Box 110096 1038 Lomb Avenue S W Birmingham Alabama 35211 Bir...

Страница 5: ...ead and the beginning of the test cable If the left marker does not already line up with this point consult with the factory 2 Now connect the conductor at the far end of the reel of test cable to its neutral or shield with a jumper Observe the leftmost point at which the two traces diverge The up blip at the open end will have an identical down blip from the short The leftmost point where the two...

Страница 6: ...g the equipment to an energized cable causes severe equipment damage While using this equipment all exposed terminations of the cable being worked on must be roped off or otherwise protected so that the unaware can not come in contact with them In sectionalizing grounding is the most important concern and safety precaution The heavy green ground lead must be connected to same ground system to whic...

Страница 7: ...ally shown on the screen The initial turn on value of 53 0 can be increased or decreased to the desired value The velocity factor can be set from 25 0 to 99 0 Screen LCD 3 5 8 9 cm x 4 5 11 4 cm with 320 x 240 dot matrix providing both trace and text The display can be easily read in direct sunlight A backlight is provided so the screen can be viewed in total darkness Memory Fifteen memories are p...

Страница 8: ...pointing When in Thump mode the TDR screen will go blank to indicate this VOLTAGE ADJUSTMENT knob adjusts the discharge voltage from a low value to the maximum voltage of 15kV GAIN button Provides manual vertical gain adjustment from 0 to 20 dB by using the up and down arrow keys OPTIONS pushbutton Pressing the OPTION key presents a menu of available options such as delay and left starts This butt...

Страница 9: ...rol circuit and motors The fuses are intended to limit and damage due to a component failure or short to the case Remove the fuses and unplug the unit when taking the unit out of it s case for maintenance VI A BASIC OPERATION Practice in a test situation with the radar before field use is very important Be sure that you know how to locate the end of the units test lead with the radar before connec...

Страница 10: ... of the cable will not show past such a low resistance fault 5 The maximum voltage can be adjusted using the VOLTAGE ADJUSTMENT knob It is recommended that except on 5kV and below cable the VOLTAGE ADJUSTMENT be kept at or near maximum as the transformers in the loop dissipate much of the energy With the entire section on the display push the START button until the sentence WAITING FOR THUMPER app...

Страница 11: ...ce the SST15 832 can then be connected to the faulted cable and the distance to the fault determined using traditional methods Some customers have expressed concerns that putting an arc reflection pulse on the source side or transformers feeding customers would send damaging pulses into the customers system Only a small percent of the energy can go through the transformer Since the SST15 832 is ra...

Страница 12: ...t where the trace changes direction 5 Notice that locating the beginning of the cable by shorting it to ground requires the most skill Everything past the fault changes 6 Notice that a short at the end of the cable is easy to find and locate 7 Remember that the first major divergence between the reference trace and the active trace is what you are looking for The down blip at the fault may not be ...

Страница 13: ...ow the right marker is at the point where the upward movement of the trace begins Figure 2 shows a typical faulted trace Notice that the right marker has moved to the beginning of the downward movement of the lower trace The distance now shows being approximately 355 feet from the hook up point to the fault Figure 3 shows another typical faulted trace This time the fault is at approximately 387ft ...

Страница 14: ...ted trace Notice that the fault is close to the far end of the cable Instead of measuring from the current end to the fault it may be easier to measure from the far end The distance from the far end can be determined by subtracting the distance to the fault 948 ft from the previously determined length of the cable 1022 ft This gives you an approximate distance of 74 feet from the far end of the ca...

Страница 15: ...u VII IN CASE OF DIFFICULTY Opening the unit should only be done by trained and qualified individuals under consultation with the factory To Open Unit remove the hex head screws from around the edge of the unit There are ten 10 screws total around the edge This is most easily done with a 5 16 nut driver Take care to save the screws lock washers and flat washers The unit pulls straight up and out o...

Страница 16: ...lead acid battery should be kept charged to at least 11 5 volts during storage since it can be severely damaged if stored below 10 5 volts The internal battery charger regulates the voltage at approximately 13 6 to 13 8 volts so the unit should be left connected to 120 240 volts AC to store between uses To check battery voltage at any time use battery check switch The battery can also be charged b...

Страница 17: ...VON MODEL SST15 832 ARC REFLECTION SECTIONALIZING SYSTEM Page 15 IX CIRCUIT DIAGRAM AND PARTS LIST To Be Added Later ...

Страница 18: ...Pulses are generated and put on a cable that must have consistent distributed capacitance A reflection will result when a discontinuity or significant change of impedance occurs An upward reflection or blip would indicate a higher impedance discontinuity such as the cable ends or a place where the cable neutral is missing A downward reflection or blip will result from a lower impedance discontinui...

Страница 19: ...most never occurs in the field Distance is figured by a radar using the time delay which is based on how fast the radar pulse travels along the cable The distance to the fault is related to the time the pulse takes to get to the fault and return The accuracy of the speed of the pulse in the cable called the velocity of propagation determines how accurately the distance to the fault can be calculat...

Страница 20: ...hat an approximate location can be determined looking at the screen 4 Provides the conductor distance to the fault Only the conductor distance is displayed Actual ground distances are subject to variations caused by the cable route and the cable depth The accuracy of any distance determined by the radar is dependent on the correct velocity of propagation and the operator s skill XII CABLE DISTANCE...

Страница 21: ... radar with the True Propagation velocity determined above Repeat steps 3 and 4 to verify that the measured cable length equals the actual cable length The propagation velocity factor is determined by dividing the actual velocity of propagation in feet microseconds by 983 Some representative values are shown below INSULATION TYPE INSULATION THICKNESS PROPAGATION CONDUCTOR SIZE AND TYPE VELOCITY FA...

Страница 22: ...e end of the cable to the fault Measure out the distance with a wheel and drive a stake b Without changing the propagation velocity on the radar take a reading from the opposite end of the cable Again measure out the distance with a wheel and drive a stake c The fault will lie between the two stakes By using the following formulas the fault location can be determined Where D1 Distance to the fault...

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