Dual 30 kA, HVDC interrupter test facility Page: 3 of 6
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Fig. 4. Interrupter test facility "b".
The storage capacitor bank, C1, (the lower bank in
Figs. 4 and 5) consists of 96 each 15-NF, 20-ky, 3-kJ
capacitors connected in parallel for a total of 289 kJ
Qnd 1440 F. The courterpulse capacitor bank, C2, (the
upper bank in Figs. 4 and 5) consists of 60 such
capacitors for a total of 180 kJ. The counterpulse bank
can be connected in various series/parallel combinations
to give 900 NF, 225 NF, or 100 NF at 20 kV, 40 kV, or
60 kV, respectively. Since the cases of these
capacitors may reach 40 kV, fiber-glass capacitor racks
are used to prevent voltage breakdown problems.
Size D ignitrons are used for switches 51, S2, and
S4 while a size A ignitron is sufficient for 53. As
shown in Fig. 6, a single ignitron is sufficient for S1
while two ignitrons in series are used for S2 to prevent
prefiring of the crowbar. Figure 7 shows switch S4
which uses four ignitrons arranged in series to
withstand the peak switch recovery voltages up to 60 kV.
Storage coil L1, consists of three to eight series
connected coil sections, shown individually in Fig. 8.
Each section has an inductance of 35 wH and a resistance
of 200 m Q . Figure 5 shows the coil as usually
configured with four sections. The total inductance of
L1 in this configuration is 0.18 mil.
Two types of saturable reactors used for L2 are
shown in Fig. 9. Both consist of a stack of 0.1-mm
thick tape wound iron cores with a total volt-second
rating of 0.05. The cores in the stack on tihe riiht are
continuous tape woun(' while those on the left are spl.t
to allow an adjustable gap.
Switch VI, the breaker under test, usually consircm
of a vacuum interrupter "bottle" and actuator as shown
in Fig. 10. The vacuum interrupter has metallic
contacts which open and arc in vacuum until extinguished
by a current zero.
An HC "snubber" circuit cu .sting of HV and Cy in
sometimes placed across swi.ch VI to control voltage
transients immediately after interruption.
Figure 11 shows the voltage probe and current
viewing resistors (CVHs) used during .witch testing.
f -- -
Fig. 5. Interrupter test facility "A".
53 ;;i IL
Fig. 6. Switch 52 (left) and S1 (right).
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Honig, E.M. Dual 30 kA, HVDC interrupter test facility, article, January 1, 1977; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1060693/m1/3/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.