Reference to IEC 60-1

- maintain test voltage for 1 min.

- during wet test, if one disruptive discharge occurs on self-restoring insulation, then repeat test to pass

- test both wet and dry conditions

- atmospheric corrections, reference IEC 60-1

Reference to IEC 60-1

- maintain test voltage for 1 min.

Reference to C37.34

- dry test:

maintain test voltage for 1 min.

apply 75% of voltage in one step, then gradually raise the voltage over 5 - 30 sec max.

- wet test:

maintain test voltage for 10 sec.

apply voltage as above

- dew test:

maintain test voltage for 10 sec

raise voltage rapidly in not more than 20 sec

Reference to IEC 60-1

- standard impulse: 1.2/50 m s

- dry conditions only

- 15 impulses each test condition and each polarity

- to pass:

max. 2 discharges per series allowed on self-restoring insulation, AND no discharges on non-self-restoring insulation

OR to pass:

- 3 consecutive impulses on each polarity and condition with no discharges.

Reference to IEC 694

Reference C37.34

- standard impulse: 1.2/50 m s

- dry conditions only

- 3 consecutive impulses, each polarity

to pass:

if one discharge occurs, then 9 add'l consecutive impulses are required with no further discharges

Reference to C37.34

- same method of application as power-frequency and lightning impulse tests given above

- test voltage is 100% (or 110% if required) of rated withstand to ground voltage

Reference to IEC 60-1

- standard impulse: 250/2500 m s

- both polarities

- wet tests for outdoor gear only

- insulation between poles, dry test conditions only

[no reference to determination of withstand values]

Reference to IEC 60-1

When open gap withstand voltage is higher than phase-to-earth withstand voltage, different test methods are used.

combined voltage tests

- Power-frequency voltage test:

two different voltage sources, in out-of-phase conditions

- Impulse voltage test:

rated impulse voltage applied to one terminal; complementary voltage from another source of opposite polarity is applied to other terminal

only one voltage source

- total test voltage applied between one terminal and earth; opposite terminal is earthed

ACCEPTANCE CRITERIA:

Reference to C37.34

- standard impulse: 250/2500 m s

- both polarities

- both dry and wet (per IEEE 4-1978) tests required

- withstand voltage determined by "Up-and-Down Method," per C37.34 and IEEE 4-1978

Reference to C37.34, except:

- withstand may be tested at 100%, or 110% if req'd, of rated withstand voltage to ground

- dry conditions only

- 3 applications of switching impulse voltage

- apply switching impulse withstand voltage on one terminal and apply bias voltage of 60 Hz on opposite terminal. Timing must be such that the polarity of one voltage crest is opposite from the polarity of the voltage crest on the other terminal of the switch.

ACCEPTANCE CRITERIA:

- no flashovers across open gap

OR

No References

No tests required for the complete HV switch.

(No References or specifications cited)

- non-enclosed outdoor-switches

Reference to IEC 1180-1

Short-duration power-frequency withstand:

- test voltage is 2000 V

- duration 1 min.

Reference IEC 694

(Under Production Tests)

- 60 Hz test

- 1500 volts for 1 min.

OR

- 1800 volts for 1 second

- switch both open and closed

- only for rated voltage (U) higher than 123 kV

- apply voltage of 1.1U/Ö ` 3

- duration: 5 min.

Not Applicable

Reference IEC 694, and:

- tests performed by agreement between user and manufacturer

- tests may be performed on one pole

- both open and closed positions

- tests not required for rated voltages 52 kV to 100 kV

- switch both open and closed

- no atmospheric corrections

- apply voltage at rated power-frequency of device