Environmental Protection Program; Application Of The X-Ray Emission Standards - ABB ConVac Installation And Operation Instruction Manual

6 C O N V A C V A C U U M C O N T A C T O R I N S T A L L A T I O N A N D O P E R A T I O N I N S T R U C T I O N
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II. Environmental protection program
ConVac vacuum contactors are manufactured in
accordance with ISO 14001 Standards (Guidelines
for environmental management) in accordance
with the environmental protection standards as
to the reduction of energy consumption and the
production of waste. All of these benefits from the
environmental protection management system of
the production process certified by the authority.
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III. Application of the X-ray emission
standards
The contact of the vacuum arcing chamber is in
the open position and may emit X rays when it is
subjected to high test voltage, which is one of the
physical characteristics of vacuum insulation.
According to the requirements of the relevant
standards, the X-ray emitted by the vacuum arc
extinguishing chamber shall not exceed the
following limits:
• At rated voltage Ur, the amount of X-ray
emission is smaller at a distance of 1 m Not
more than 5 μSv
• At rated short-time power frequency withstand
voltage Ud, distance 1 m, X-rays The emission
rate is not more than 150 μSv per hour
The special type test of ABB vacuum arc
extinguishing chamber in relevant experimental
institutions in Germany proved that the X-ray
emission at 10 cm away from the contact surface
was less than 1 μSv per hour.
From this it can be concluded that:
• The vacuum arcing chamber is absolutely safe
for use under rated voltage
• The switchgear can be safely used under the
power frequency withstand voltage value
required by GB/T 11022 standard