BS EN 60099-1:1994

Foreword
Introduction
Section 1: General
1.1 Scope
1.2 Normative references
Section 2: Definitions
2.1 Surge arrestor
2.2 Non-linear resistor type gapped arrester
2.3 Series gap of an arrester
2.4 Non-linear series resistor of an arrester
2.5 Section of an arrester
2.6 Unit of an arrester
2.7 Pressure-relief device of an arrester
2.8 Rated voltage of an arrester
2.9 Rated frequency of an arrester
2.10 Disruptive discharge
2.11 Puncture
2.12 Flashover
2.13 Sparkover of an arrester
2.14 Impulse
2.15 Rectangular impulse
2.16 Peak (crest) value of an impulse
2.17 Front of an impulse
2.18 Tail of an impulse
2.19 Full-wave voltage impulse
2.20 Chopped voltage impulse
2.21 Prospective peak (crest) value of a chopped
        voltage impulse
2.22 Virtual origin of an impulse
2.23 Virtual front time of an impulse (T1)
2.24 Virtual steepness of the front of an impulse
2.25 Virtual time to half value on the tail of an
        impulse (T2)
2.26 Designation of an impulse shape
2.27 Standard lightning voltage impulse
2.28 Switching voltage impulse
2.29 Virtual duration of the peak of a rectangular
        impulse
2.30 Virtual total duration of a rectangular impulse
2.31 Peak (crest) value of opposite polarity of an
        impulse
2.32 Discharge current of an arrester
2.33 Nominal discharge current of an arrester
2.34 Follow-current of an arrester
2.35 Residual voltage (discharge voltage) of an
        arrester
2.36 Power-frequency sparkover voltage of an arrester
2.37 Impulse sparkover voltage of an arrester
2.38 Front-of-wave impulse sparkover of an arrester
2.39 Standard lightning impulse sparkover voltage of
        an arrester
2.40 Time to sparkover of an arrester
2.41 Impulse sparkover-voltage/time curve
2.42 Prospective current
2.43 Type tests (design tests)
2.44 Routine tests
2.45 Acceptance tests
2.46 Protective characteristics of an arrester
2.47 Arrester disconnector
Section 3: Identification and classification
3.1 Arrester identification
3.2 Arrester classification
Section 4: Standard ratings
4.1 Standard voltage ratings
4.2 Standard rated frequencies
4.3 Standard nominal discharge currents
4.4 Service conditions
        4.4.1 Normal service conditions
        4.4.2 Abnormal service conditions
Section 5: Requirements
5.1 Power-frequency sparkover voltage
5.2 Standard lightning impulse sparkover voltage
5.3 Front-of-wave impulse sparkover voltage
5.4 Switching impulse sparkover voltage
5.5 Lightning impulse residual voltage
5.6 Switching impulse residual voltage
5.7 High-current impulse withstand
5.8 Long-duration current withstand
5.9 Operating-duty
5.10 Pressure-relief
5.11 Disconnectors
        5.11.1 Disconnector withstand
        5.11.2 Disconnector operation
Section 6: General testing procedure
6.1 Test samples and measurements
6.2 Power-frequency voltage tests
6.3 Wet tests
6.4 Artificial-pollution tests
Section 7: Routine and acceptance tests
7.1 Routine tests
7.2 Acceptance tests
Section 8: Type tests (design tests)
8.1 General
8.2 Power-frequency voltage sparkover tests
8.3 Voltage impulse sparkover tests
        8.3.1 General
        8.3.2 Standard lightning impulse sparkover test
        8.3.3 Lightning impulse sparkover-voltage/time
                curve test
        8.3.4 Front-of-wave impulse sparkover test
        8.3.5 Switching impulse sparkover-voltage/time
                curve test
8.4 Measurement of residual voltage
        8.4.1 Lightning impulse residual voltage
        8.4.2 Switching impulse residual voltage
8.5 Current impulse withstand test
        8.5.1 General
        8.5.2 High-current impulse test
        8.5.3 Long-duration current impulse test
8.6 Operating-duty test
8.7 Pressure-relief tests
        8.7.1 General
        8.7.2 High-current pressure-relief tests
        8.7.3 Low-current pressure-relief tests
8.8 Tests of arrester disconnectors
        8.8.1 General
        8.8.2 Current impulse withstand and
                operating-duty tests
        8.8.3 Disconnector operation
Annexes
A (normative) Abnormal service conditions
B (informative) Typical information given with
        enquiries and tenders
C (informative) Selection of the long-duration
        discharge class of heavy-duty arresters
D (informative) Typical circuit for a
        distributed-constant impulse generator for the
        long-duration current impulse test according to
        8.5.3
E (informative) Typical circuit for operating-duty
        test according to 8.6
ZA (normative) Other international publications
        quoted in this standard with the references of
        the relevant European publications

Applies, in particular, to surge arresters consisting of single or multiple spark gaps in series with one or more non-linear resistors.