Instrument Transformers
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Current Transformers IMB (36 - 800 kV)
Flexible design enables customer-tailored solutions IMB oil-minimum current transformers are based on a tank type (hairpin) design and available with porcelain or silicone rubber insulators. Hitachi Energy current transformers are tailor-made. The combination of different tank sizes, expansion systems, primary windings etc. makes it possible to meet most customer requirements from 36 kV up to 800 kV. More than 170,000 units have been delivered and installed all over the world - from desert to arctic climates by Hitachi Energy. Comprehensive service records show that the failure rate of IMB current transformers is up to four times lower than the industry average. Applications: Revenue metering Protective relaying System control and indication of power flow |
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Capacitor Voltage Transformer CPB (72-800 kV)
World-class CVT for long term performance and reliability Capacitor Voltage Transformer CPB is designed for revenue metering and protection in high voltage networks. It is of single-phase design and intended for connection between phase and ground in networks with insulated or direct-grounded neutral points. The high quality, state of the art, automated manufacturing of the capacitor elements provides consistent quality to ensure long term reliability and performance. Due to the optimized proportions of the mixed dielectric, the capacitor elements are subject to low electrical stress with high stability under extreme temperature variations. The CPB is available from 72 kV up to 800 kV. It can withstand a wide range of shifting conditions including polar and desert climates. Applications: Revenue metering Protective relaying System control and indication of power flow Power line carrier transmission |
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Gas-insulated instrument transformer for enhanced safety and reliability
TG COMBI gas-insulated combined current and voltage transformer is built for revenue metering and protection in high voltage networks. The TG COMBI has been designed for voltage up to 300 kV. Suitable for both metering and protection Magnetic cores made of laminated steel with oriented grain and a high level of permeability Windings made of electrolytic copper Safety margin for normal wind loads, stress from conductors and seismic forces Remote control of the internal insulation level by means of pressure gauge provided with an alarm threshold and lock threshold A pressure relief device protects the apparatus from internal overpressure Applications: Revenue metering Protective relaying System control and indication of power flow |
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Station service voltage transformer SSVT (46 - 362 kV)
Outdoor oil-filled station service voltage transformer for HV to LV/MV substation and remote power needs SSVT inductive voltage transformers consist of a single-phase design intended for connection between phase and ground on 46 kV-362 kV HV grounded neutral networks to supply power to panels at low voltage or medium voltage. The design allows for convenient siting within the substation environment for simple mounting to single phase supports. The SSVT is directly connected to the HV network and provides power to the panel within the substation, or to remote loads directly supplied for the HV service. SSVTs can provide output voltages from 120 V to MV levels (contact factory for specific output voltages). Power levels available range from 10 kVA to 167 kVA single phase supply for all system voltages, and as high as 333 kVA for 245 kV systems. Station service voltage transformers can be supplied for power only, or power plus optional metering windings having either single or two tapped windings for voltage measurement. Hermetic sealing of the design is accomplished using a gas cushion above the oil to prevent free-breathing outside moisture-ladened air. ANSI 70 gray insulators are supplied with high creep and high strike designs. Porcelain insulators are normally standard with polymer offered as an option, except at 362 kV, which has a standard polymer design. Applications: Station service auxiliary power needs Railway applications for small power needs Remote site power for small industrial loads or mining sites Rural electrification for reducing the cost of first power |
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Coupling Capacitor CCB (72 - 800 kV)
A world-class coupling capacitor with superior properties for PLC application Coupling capacitors CCB are intended for power line carrier, filtering and other general capacitor applications with connection between phase and ground in high voltage networks with isolated or grounded neutral. The CCB is designed for widely shifting conditions from polar to desert climates. The mixed dielectric in the capacitor element is subject to low stress and has proven to be insensitive to temperature changes. With regard to PLC application the CCB is suitable for use within the entire power line carrier transmission frequency range from 30 kHz to 500 kHz. Applications: Power line carrier transmission Filtering and other general capacitor applications |
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ANSI Indoor Current Transformers
Bushing current transformers with typical applications in high voltage circuit breakers and power transformers. LV thermoplastic rubber current transformers for a variety of applications including secondary revenue metering. LV plastic case window-type current transformers offered in a variety of internal window diameters and used in various switchgear applications. MV indoor current transformers with typical applications in switchgear and metal-clad enclosures for primary and revenue metering and protection. Utilities can collect additional revenue without having to increase rates per kilowatt hours -- simply by improving the range and accuracy of metering. With Hitachi Energy's AccuRange Current Transformers, hidden power at the low end of the range is detected and measured while mid-range power is more finely metered for its true value. At the same time, the potential increase in upper range current will provide assets additional protection. Product scope - ANSI indoor voltage transformers Designed for service in metal-clad switchgear and used for metering, relaying, or control power. Single, double, and tapped secondary designs with two accuracy and thermal rating options. Voltage class range of 0.6kV to 35kV |
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ANSI Instrument Transformers for outdoor application
Available in voltage classes ranging from 0.6 kV to 69 kV. ANSI outdoor medium voltage transformers are encapsulated in hydrophobic cycloaliphatic epoxy (HCEP) using the automatic pressure gelation (APG) process. Current and voltage transformers are available in voltage classes ranging from 5 kV to 34.5 kV. These units are typically used by utilities in substations. Voltage units are available for line-to-line applications, designated by Y, and for line-to-ground applications, designated by GY. |
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Outdoor Voltage Transformers are designed for high burden applications and are suitable for operating meters and relays and supplying control power. The VOZZ-20 is a two bushing design for line-to-line applications where the line-to-line voltage equals the primary rating of the transformer. The unit can be connected line-to-ground/earth at reduced voltage.
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