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Measurement of Resistance
MAIN CIRCUIT
- current between 50 A and rated
normal current
AUXILIARY CIRCUIT
- current: 10 mA
voltage: 6 V dc
- resistance not to exceed 50 W
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Measurement of Resistance
Reference to IEC 694
measurements only applicable for disconnectors |
Measurement of Resistance
(No references or specific tests are cited) |
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Mechanical Terminal Load
25 open/close cycles with rated mechanical terminal loads
After test: verifications
- Manual equipment - values of forces do not differ by more than 20%
- Electrically operated equipment - power consumed by motor during operation is not materially increased
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Mechanical Terminal Loading
[1 kV <
U]
no terminal loadings required for indoor switches
outdoor switches must be loading under 4 different conditions
10% of rated number of operations must have mechanical loading of the terminals
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Operation Under Ice
only if manufacturer claims suitability of equipment for ice conditions
clear or rime ice
two classes of thickness:
10 mm and 20 mm
single poles can be tested only if each pole has separate operating mechanism
if common operating mechanism, then must test 3-pole except for rated voltages exceeding 72.5 kV
test both opening and closing operations
external surfaces free of oil & grease traces
ACCEPTANCE CRITERIA:
- no reference to "chopping action" or number of attempts
- Manual switch can be operated manually without damage affecting mechanical or electrical performance
- Power-operated switch can be operated by operating device without damage affecting mechanical or electrical performance
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Ice Loading Test
laboratory or natural environment
test must be under clear ice
ice thickness: at rated ice-breaking ability
- both opening and closing operations
- external surfaces free of oil & grease traces
ACCEPTANCE CRITERIA:
- chopping action is acceptable means of loosening the ice for opening or closing of manual switches
- power-operated switches must operate successfully on the first opening attempt. Multiple attempts for closing are permitted.
- no significant change in contact forces or resistances before and after test
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Operation at Temperature Limits
(No references or specific tests are cited) |
Operation at Temperature Limits
10 operating cycles at each:
- minimum ambient air temp
- maximum ambient air temp
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Operation at Temperature Limits
(No references or specific tests are cited) |
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Contact Zone Test
(No references or specific tests are cited) |
Contact Zone Test
see Figures 1 and 2
Test to prove satisfactory operation of disconnectors in various positions of the fixed contact. Device shall open and close correctly in each position.
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Contact Zone Test
(No references or specific tests are cited) |
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Mechanical Endurance Test
(No references or specifications cited) |
Mechanical Endurance Test
1,000 operations without mechanical terminal loads
- If a switch operator is used, the control voltage / pressure of operator shall be:
at rated value for 900 operations
at minimum value for 50 operations
at maximum value for 50 operations
- during tests, lubrication is allowed, but no adjustments
ACCEPTANCE CRITERIA:
- for a dependent manual operating mechanism, operating torque shall not increase by more than 20% from the values before the test
- during test must verify that control & auxiliary contacts and position-indicating devices operate satisfactorily
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Mechanical Operations Test
- rated number of mechanical operations
- For power or stored energy operated switches, the control voltage / pressure / force shall be:
at rated value for 90% of operations
at minimum for 5% of operations
at maximum for 5% of operations
- during tests, no maintenance, repairs or replacements are allowed
ACCEPTANCE CRITERIA:
- contact forces or resistances before and after have no significant change
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