A free MV switchgear condition assessment tool

On-line preliminary survey about your medium voltage air insulated switchgear to evaluate the need for a deeper analysis

AIS preliminary survey is a simple tool for evaluating the need for a more in-depth assessment carried out by ABB. Its use is strongly recommended for those plants where conventional maintenance strategies are still applied and no other assessment has been performed.

Check each environmental and operational condition, compare the plant situation with given range/status values and select one check button for each field group. Fill in the number of years since the last ABB assessment was performed and click on the Run check button to get the survey result.

Environmental conditions (Id numbers from 1 to 4) refer to the entire switchgear including the period in stock at site, whereas the operational conditions (Id from 5 to 10) relate to the most critical installed device.

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Id) Condition

Range/Status Choice
1) Ambient temperature
IEC Tmin < -5°C and Tmax > 40°C

Tmin < -5°C or Tmax > 40°C

Tmin > -5°C and Tmax < 40°C
ANSI Tmin < -22°F (-30°C) and Tmax > 104°F (40°C)

Tmin < -22°F (-30°C) or Tmax> 104°F (40°C)

Tmin > -22°F (-30°C) and Tmax < 104°F (40°C)
GB Tmin < -25°C and Tmax > 40°C

Tmin < -25°C or Tmax > 40°C

Tmin > -25°C and Tmax < 40°C
2) Maximum relative humidity in substation
Up to 60%
60% to 90%
90% and above
3) Salt or chemicals in the air
None
Close to sea or industrial area position
Marine or onshore or chemical plant position
4) Dust - ventilation in the substation
Air conditioned
Ventilated with filters
Not protected
5) Protection and control electronic devices
Correct function
Incorrect operation reported once
False tripping or permanent incorrect function
6) Average load current

(% of nominal)
Up to 90%
90% to 100%
100% and above
7) Mechanical or load current circuit-breaker operations

(per year)
Up to 10
10 to 300
300 to 500
500 and above
8) Load current operation of contactor

(per day)
Not installed in the plant
Less than 5
5 to 10
More than 10
9) Fault current operation of circuit-breaker or contactor

(per year)
Less than one
One
More than one
10) Racking in operations (per year)

Multiply by 10 times the operations if motor operated
Less than 5
5 to 10
More than 10
Number of years from the last ABB assessment:
Run check

Survey result

Perform this survey on a yearly basis
A more in-depth asset condition and risk assessment by ABB is needed
A more in-depth asset condition and risk assessment by ABB is urgently needed
Please, select one check button for each field group.

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