TM1700-series
Circuit Breaker Analyzer System
2
With only one side grounded the induced current can reach
values high enough to be harmful or lethal for humans.
Testing is much safer using the DCM module and
DualGround.
▪
Contact
resistance
MJÖLNER /
SDRM202
▪
Timing TM1700 with DCM
▪
Motion TM1700
▪
SDRM TM1700 with
SDRM202
▪
Vibration CABA Win Vibration
/ SCA606
Equipment and methods that support DualGround™ testing are
associated with the DualGround symbol. This symbol certifies the
use of ground-breaking technology and methods that enable a
safe, fast and easy workflow with both sides grounded through-
out the test.
Conventional vs. DualGround
Site preparation (isolate work
area, apply safety ground, issue
permit to work)
Site preparation (isolate work
area, apply safety ground, issue
permit to work)
Hook up test equipment. Issue
sanction for test
Hook up test equipment. Issue
sanction for test
Authorised person removes the
ground
Risky step left out
Perform testing Safe testing with both sides
grounded
Authorised person applies
ground
Risky step left out
Cancel sanction for test. Discon-
nect test equipment
Cancel sanction for test. Dis-
connect test equipment
Site closing (cancel permit to
work, disconnect ground)
Site closing (cancel permit to
work, disconnect ground)
Testing with DualGround
Electricity deregulation changes the business environment for utili-
ties, switchgear owners and service companies. Deregulation has
been shown to lead directly to increased emphasis on efficiency of
operations, maintenance and service levels. Internationalization of
business brings new challenges: substantial investments by global
corporations will bring with them sharper or new requirements for
increased emphasis on health, safety and environmental compliance.
Experience has also shown there is less time for testing because the
switchgear is less and less available to be taken out of service.
The safety aspect
Network operators and service companies need to maintain and
develop their industry safety record. Eminent International bodies
including the IEEE® and IEC®, National Safety agencies and Trade
Unions increases the demands on safety. During the deregulation
safety regulations have been clarified and the application of existing
rules has been tightened. Keeping a good safety record is becoming
a crucial asset to attract investors and customers.
In all substations the capacitive coupling from live high voltage
conductors induce harmful/lethal currents in all parallel conductors.
Grounding both sides of the test object will lead the induced current
to earth and provide a safe area for the test personnel. See diagrams
below.
Both sides grounded
The best way to provide safety in circuit breaker testing is to keep
both sides of the circuit breaker grounded throughout the test. This
will also make the test faster and easier. Testing personnelshould
spend the minimum time in the substation and their focus should be
the test rather than the equipment.
The DualGround™ testing method is available for all tests on all
circuit breakers.
(14 paginas)
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