The
test leads for the modular Model C, D,
E, F and G series test sets are considered expendable. HV voltage
leads of #12 insulated THW solid wire or RG-8U polyethylene cable
can be made up to length as needed. Ground leads and jumpers can be
made up or purchased locally. An accessory lead
kit is available for modular units with leads, jumpers, and a
storage case. Special length leads are available for units such as
the Model B-.35, BI-.35, BI-.35S1, and EI-.35 which require leads
with VON high voltage connectors.
Cable,
Generator, and Related Apparatus Testing:
Only
the basic D.C. testing unit is required. To test at higher voltages
with VON modular test sets, add the appropriate VON topping unit modules
to reach the maximum desired voltage. Additional accessories are required
for stacks above 300kv.
When
the maximum test voltage must not be exceeded such as when testing
generators, a VON 6.25cm or 12.5cm protective
sphere gap is required. Use of a sphere gap following IEEE
Standard #4 eliminates any question as to maximum voltage applied
on test.
Auxiliary
microammeters are available with ranges of 0-5, 0-10, or 0-20
microamps for use with the Model C,
D, and E series test sets. A M3-T topping unit with six current
meters is also available which permits simultaneously measuring
leakages while testing three individual circuits.
Aerial
Lift and Switch Stick Testing:
Only
the basic D.C. testing unit is required.
A
set of two high voltage leads is available specifically designed
for aerial lift testing.
One
inch diameter stainless steel springs are available for use in
testing boom or stick insulation on a foot by foot basis
A
Model SS1 switch stick testing accessory
is available for testing sticks
Cable
Fault Location:
A
capacitor or capacitors and a gap are required for fault locating
with the Model B, C, D, E, F and G.
series test sets. They may also be added externally to the Model
BI, EI, and FI impulse fault locators. The minimum requirements
are listed below:
One
VON Impulse Service Capacitor
- 1 mfd at 30kv or 2.6 mfd at 30kv or 4 mfd at 15kv or 10.6
mfd at 15kv or .25 mfd at 60kv
35kv
to 90kv impulses are often required to arc over faults on 69kv
to 500kv cable. Modular Model C, D,
and E test sets can provide a 60kv impulse voltage using two 30kv
capacitors in series and a 60kv impulse control gap. Three 30kv
capacitors in series and a 90kv impulse control gap can provide
a 90kv impulse voltage. Check with the factory for the protective
output resistor values needed at these voltages.
