Baur PGK 110 HB, Руководство по эксплуатации, Страница: 8 / 34

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1. Product Information
Design and Function:
With the PGK 70 - 2,5 HB, PGK 110 HB, PGK 150 HB and the
PGK 260 the corona protection hood is used as oil expansion tank
(conservator) and may not be removed or damaged. With the
PGK 70 HB an air cushion in the housing (tube) works as a
compressible volume for absorbing the oil expansion. That’s why
the H.V. unit may only be stored, shipped and operated vertically.
Generation of high voltage is carried out by a H.V. transformer
supplied by an variable transformer. During D.C. operation a half-
wave rectifier is connected after the H.V. transformer. By turning the
half-wave rectifier the polarity of the output voltage can be changed.
The capacity of the test object acts as smoothing capacitor. During
A.C. operation, a damping resistor is connected to the H.V. circuit
instead of the half-wave rectifier (with PGK 260 HB: option - not
included)
The H.V. units of the PGK HB instruments are equipped with a
potential grading ring which can also be used as carrying ring. The
instruments may be not operated without this potential grading ring.
The PGK HB instruments are designed as two-part High Voltage
Testing Sets.
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Operating unit with all indicating/operating elements, with power
supply and safety devices.
•
High Voltage unit as oil-filled housing with High Voltage trans-
former with the choice of a rectifier bar for half-wave rectification
or a resistance bar as a damping resistor.
Design
Depending on the load by the test object and the voltage set, the
PGK HB instruments are operating in one of the two operating
ranges Continuous Operation and Short-time Operation.
Continuous operation:
Within this operating range, from no-load to nominal rating up to
cut off load the instrument can be loaded continuously.
Short-time operation:
Within this operating range from cut off load to short circuit the
instrument switches current-limiting lamps into the primary circuit of
the H.V. transformer in order to reduce the thermal load of the
instrument. Additionally, as a protection against overload the
overcurrent protection switch (5) with its thermal and magnetic
tripping characteristic is tripped after a specific period terminating
operation. The time until tripping depends on load and takes from
seconds (during short-circuit) to hours (at maximum load).
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Operating ranges
High Voltage generation
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