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PT Crompton Prima Switchgear Indonesia The First High Voltage and Extra High Voltage Air-Insulated Switchgear Factory in Indonesia |
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Product
Full range of HV/EHV Air-Insulated Switchgears (AIS) from 72.5 kV to 550 kV
Lighting ArresterComponents in any power system, face, in service, over voltages that arise either due to natural lightning or inevitable switching operations. Surge arresters are used to protect power system installations and equipment against Lightning, Over-Voltages, Switching Surges etc. Generally arresters are connected across the equipment to be protected, typically between phase and earth for three phase installations. CG metal oxide Surge Arresters consist of active part, which is a series of highly nonlinear ceramic resistors made essentially of Zinc Oxide. Fine Zinc Oxide crystals are surrounded by other metal oxides (additives). Special Features
All Arresters in this Catalogue are designed in line with the requirements of ANSI-IEEE Standard C62.11 & IEC 60099-4. Note: CG Ltd. reserves the right to change design and specifications in this catalogue without notice, due to continuous product improvements. Explanation of Terms Voltage Rating The voltage rating of an arrester is that voltage which can be applied for a limited time after the arrester has absorbed a large amount of energy as established in the operating duty tests. The rated voltage is used asa reference parameter for the specification of operating characteristics. Maximum Continuous Operating Voltage (MCOV) The MCOV is the maximum permissible rms value of power frequency voltage that may be applied continuously between the terminals of the arrester. Temporary Over-Voltage Capability An arrester must be selected with a high enough voltage rating to with stand temporary over voltages, which might be caused by various occurrences on the system. The most common event causing a temporary overvoltage is a single line to ground fault. For an effectively grounded system such faults will normally be cleared in less than one second. Therefore an overvoltage capability based on duration of one second is usually recommended. Also, below table shows Temporary Overvoltage Capability for a time range of 0.1 to1,000 seconds. Arrester Voltage Ratings The chart below indicates the minimum MCOV customers need to specify for an arrester as a function of system voltage. The minimum recommended ratings for solidly grounded systems allow for a temporary voltage rise of at least 40% over a period of one second. Higher temporary over voltages may require higher MCOV.
Arrester Application Information CG Arresters are designed to use at altitudes of 1000 m. Arresters can be customized to meet requirements for higher altitudes. CG arresters can be used at an average temperature of 40°C & where daily maximum temperature does not exceed 60°C (140°F). The energy absorption capability – a two shot energy discharge within one minute, signifies the switching surge capability of these arresters. Wherever Grading Ring is a requirement, it is dispatched along with the Arresters. The base mounting & Terminal options can be customized to specific needs in addition to the options provided in this Catalogue. Surge Counters to monitor Arrester discharges are available with built in milli-am meter. Where Surge Counters is a requirement, it is supplied with suitable Insulating bases (IBs) for Arrester isolation.
Surge Arrester Selection Process
With available Surge Arrester parameters and from appropriate table, other ratings of Surge Arrester can be determined. The tables show typical requirements from customers. Surge Arrester with different parameters can also be supplied. Class – 2 Reference Standard - IEC 60099-4, ANSI IEEE Std C62.11, IS 3070 (Part-3) Arrester Type & Class - Gapless, Station class Rated Frequency Hz 48-62 Hz Line Discharge - Class 2 Nominal Discharge Current kAp 10 Pressure Relief Class kArms A / 40 Energy Handling Capability kJ / kV of Rating 4.0 Continuous Leakage current at MCOV Resistive (Max.) micro-amps – 400 & Capacitive (Max.) – micro-amps – 1500 Cantilever strength Kg-m 325 Product Range 2.7 kV to 144 kV Guaranteed Technical Particular Surge ArresterClass-2
Class –3 Reference Standard - IEC 60099-4, ANSI IEEE Std C62.11, IS 3070 (Part-3) Arrester Type & Class - Gapless, Station class Rated Frequency Hz 48-62 Hz Line Discharge - Class 3 Nominal Discharge Current kAp 10kAp Pressure Relief Class kArms A / 65 Energy Handling Capability kJ / kV of Rating 6.0 Continuous Leakage current at MCOV Resistive (Max.) micro-amps — 400 & Capacitive (Max.) micro-amps – 1500 Cantilever strength Kg-m 725 Product Range - 2.7 kV to 420 kV Residual Voltage Values for ZLA3 in Doughnut Block (D7) Design Guaranteed Technical Particular Surge Arrester Class-3
Class –4 Reference Standard - IEC 60099-4, ANSI IEEE Std C62.11, IS 3070 (Part-3) Arrester Type & Class - Gapless, Station class Rated Frequency Hz 48-62 Hz Line Discharge - Class 4 Nominal Discharge Current kAp 20 kAp Pressure Relief Class kArms A/65 Energy Handling Capability kJ / kV of Rating 8 - 12 Continuous Leakage current at MCOV - Resistive (Max.) micro-amps — 500 & Capacitive (Max.) micro-amps – 2000 Cantilever strength Kg-m 725 Product Range - 2.7 kV to 420 kV Guaranteed Technical Particular Surge Arrester Class-4
Class –4 (High Creepage) Reference Standard - IEC 60099-4, ANSI IEEE Std. C62.11, IS 3070 (Part-3) Arrester Type & Class - Gapless, Station class Rated Frequency Hz 48-62 Hz Line Discharge - Class 4 Nominal Discharge Current kAp 20 kAp Pressure Relief Class kArms A/65 Energy Handling Capability kJ / kV of Rating 8 - 12 Continuous Leakage current at MCOV - Resistive (Max.) micro-amps — 500 & Capacitive (Max.) micro-amps – 2000 Cantilever strength Kg-m 725 Product Range - 2.7 kV to 420 kV Guaranteed Technical Particular Surge Arrester Class-4 High Creepage
Accessories: Surge Arrestors may be supplied with following accessories on request:
Note: Grading rings are supplied with CG Surge Arresters for CLASS 3& 4 and for KV rating higher than or equal to 144 KV. Class - 3 Polymeric LA Reference Standard - IEC 60099-4, ANSI IEEE Std C62.11, IS 3070 (Part-3) Arrester Type & Class - Gapless, Station Class Rated Frequency Hz 48-62 Hz Line Discharge - Class 3 Nominal Discharge Current kAp 10 kAp Pressure Relief Class kArms A/65 Energy Handling Capability kJ / kV of Rating 6 to 10 Continuous Leakage current at MCOV - Resistive (Max.) micro-amps — 400 & Capacitive (Max.) micro-amps – 1500 Cantilever strength Kg-m 225 Product Range - 54kV to 420kV Model No. - ZPL-3 Guaranteed Technical Particular Surge Arrester Class-3Polymeric LA
Class - 4 Polymeric LA Reference Standard - IEC 60099-4, ANSI IEEE Std C62.11, IS 3070 (Part-3) Arrester Type & Class - Gapless, Station Class Rated Frequency Hz 48-62 Hz Line Discharge - Class 4 Nominal Discharge Current kAp 20 kAp Pressure Relief Class kArms A/65 Energy Handling Capability kJ / kV of Rating 8 to 12 Continuous Leakage current at MCOV - Resistive (Max.) micro-amps — 500 & Capacitive (Max.) micro-amps – 2000 Cantilever strength Kg-m 225 Product Range - 54kV to 420kV Model No. - ZPL-4 Guaranteed Technical Particular Surge Arrester Class-4 Polymeric LA
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ProductBreakers & Disconnectors
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