Outdoor Instrument Transformers

ABB’s medium voltage current and voltage outdoor instrument transformers ideal for various outdoor applications

Protecting an evolving outdoor grid 

 

ABB’s medium voltage outdoor instrument transformers are cast in hydrophobic cycloaliphatic epoxy resin (HCEP). The HCEP material offers superior arc track, ozone, and ultraviolet-resistive properties while maintaining physical strength. The hydrophobic surface properties of HCEP ensure highly reliable performance in harsh, wet, or humid environments to fully withstand outdoor conditions.

ABB’s medium voltage outdoor instrument transformers (current and voltage), for IEC and other standards, are ideal for various outdoor applications such as medium voltage substations, circuit breaker and switch disconnector installations, pole-mounted metering units and overhead line installations, railway substations and distribution transformers. As part of our portfolio, ABB offers current and voltage outdoor instrument transformers:

  • Outdoor current transformers, up to 52 kV for metering and protection purposes
  • Outdoor voltage transformers, up to 40,5 kV for metering, protection and external power supplies

Built to withstand the rigors of the most demanding environments, ABB medium voltage outdoor instrument transformers are available for original equipment manufacturers (OEM),  Engineering, Procurement and Construction (EPC) partners as well as end-users to incorporate in their own new installations or retrofit and upgrade projects. 

ABB supports customers and partners in staying ahead of increasing electrification needs, technology advancements, and regulatory changes, providing the power to adapt to a rapidly evolving energy landscape.

Outdoor ITs portfolio

Current transformers

Product scope

   CTR TPO KON KOHU KOKU IMT
Max.rated voltage CTR-25   52 kV

 

TPO 6   25 kV

TPO 7   40,5 kV

 

 

KON 17.5   17,5 kV

KON 24   25 kV

 

 KOHU 24   24 kV 

 

KOKU 072   0,72 kV

KOKU 1   1,2 kV

 

 IMT 0,72 kV

Max.rated

primary current

 3 000 A 3 000 A 
 1 875 A
 600 A

800 A

10 000 A


 1 000 A
Max.rated short-time current

63 kA / 1 s

 100 kA / 1 s 
 63 kA / 1 s
 30 kA / 1 s
 63 kA / 1 s 
 25 kA / 3 s 

Max.quantity of

cores

 4 cores  4 cores  2 cores  1 core 1 core
3 cores 		 1 core
Standards

IEC, EN, VDE, ČSN, PN, AS, BS, GOST

 

IEC, VDE, ČSN, PN,

AS, BS, DSTU, GOST

 

 

IEC, VDE, ČSN, PN,

AS, BS, GOST,

IEEE, CAN/CSA

 

 

IEC, VDE, ČSN, PN,

AS, BS, GOST

 

 

IEC, VDE, ČSN, PN,

AS, BS, GOST,

IEEE, CAN/CSA

 

 

IEC, VDE, ČSN, PN, AS, BS, GOST

 
Applications

Outdoor and railway

substations, structure

mounted outdoor

switchgear (SMOS),

auto transf. feeder

stations

 

MV outdoor

substations, overhead

line installations,

outdoor circuit breakers

 

 

Overhead line

installations, polemounted

units, MV

outdoor substations,

circuit breakers, switch

disconnectors

 

 

Designed for MV

outdoor NPS switch

disconnector

 

 

Switch disconnector

(Sectos), overhead line

installations, outdoor

substations, zerocurrent

measurements

 

 

 

Distribution

transformers,

transformers, outdoor

substation, overhead

line installations

 
Features

HCEP, IP55, long creepage distance,

compliant with railway

EN 50152-3-2 standard

 

HCEP, IP54, long creepage distance, opt.

primary or secondary

reconnection, opt. NEMA primary terminals

 

 

HCEP, IP54, lightweight

products,

vertical or horizontal

installations, opt. reconnection on prim. or secondary side

 

 

 

Hydrophobic

cycloaliphatic epoxy resin (HCEP), weight only 7 kg

 

 

HCEP, IP54, inner Ø 33~500 mm, length up

to 300 mm, opt. sec. reconnection, opt. C5H for a high

corrosivity environm.

 

 

HCEP, IP44, inner Ø 53, 73 or 95 mm,

weight up to 10kg, two

secondary wires 4-6 m long

 

  TJO VOG TDO VOL VOL TJR
Max.rated voltage

 

 

TJO 6    25 kV

TJO 7    40.5 kV

 

 

 

 

VOG-24   25kV

 

 

 TDO 6    25 kV 

 

 

VOL-24   24 kV

 

 

 VOL-40.5   40,5 kV

 

TJR-25   27,5 kV

 

Max.rated

primary voltage

 36 000: √3 kV
 22 000:  √3 kV
 22 000 kV

 

22 000 kV

 


 38 000 kV

 

27 500 kV

 
Min.rated voltage factor 1,9x Un / 8h
 1,9x Un / 8h

1,2x Un /

Continuous

1,2x Un /

Continuous

 

1,2x Un /

Continuous

 

1,9x Un / 8h

 

 

Max.quantity of windings

 3 windings  2 windings 2 windings 2 windings  2 windings 2 windings 
Standards

 

 

IEC, VDE, ČSN, PN, 

AS, BS, GOST,

IEEE, CAN/CSA

 

 

 

 

IEC, VDE, ČSN, PN, AS, BS, GOST, IEEE, CAN/CSA

 

 

 

 

IEC, VDE, ČSN, PN, AS, BS, GOST

 

 

 

 

IEC, VDE, ČSN, PN, AS, BS, GOST, IEEE, CAN/CSA

 

 

 

IEC, VDE, ČSN, PN, AS, BS, GOST

 

 

 

 

 

IEC, EN, VDE, ČSN, PN, AS, BS

 

 
Applications

 

 

MV outdoor

substations, overhead

line installations, polemounted

units

 

 

 

 

MV outdoor

substations, overhead

line installations, polemounted

units

 

 

 

 

External power

supplies, overhead

line installations,

switch disconnector,

MV outdoor

substations

 

 

 

 

External power

supplies, overhead

line installations,

switch disconnector,

MV outdoor

substations

 

 

 

External power

supplies, overhead line

installations, switch

disconnector, MV outdoor substations

 

 

 

Outdoor railway

substations, structure

mounted outdoor

switchgear (SMOS), auto transf. feeder

stations

 

 
Features

 

 

HCEP, IP54, long

creepage distance, opt. reconnection on secondary side, opt. clamp type primary

 

 

 

 

HCEP, IP54, lightweight,

installation

vertical or horizontal,

opt. secondary

reconnection, opt. clamp type primary

 

 

Hydrophobic

cycloaliphatic epoxy resin (HCEP), IP54,

long creepage

distance, optional sec. reconnection

 

 

 

 

HCEP, IP54, lightweight,

installation

vertical or horizontal,

opt. secondary

reconnection, opt. clamp type primary

 

 

 

 

HCEP, IP54, long

creepage distance,

optional secondary

reconnection

 

 

 

 

HCEP, IP55, long

creepage distance,

compliant with railway

EN 50152-3-3 standard

 

Related offering

Outdoor

Built to withstand the most demanding climates, the Outdoor portfolio provides a robust and versatile range of grid components, including reclosers and circuit breakers, essential for supporting the evolving needs of the external grid infrastructure.

Switch disconnector

Highly adaptable for secondary distribution networks, Switch Disconnectors reliably carry, interrupt, and make rated load current, offering both air-insulated and gas-insulated options suitable for various indoor operations.

Primary protection relays

Critical for grid safety and reliability, Primary Protection Relays continuously monitor the system to recognize abnormal conditions and instantly initiate cor-rective actions, preventing faults from spreading across the network.

Secondary protection relays

Specifically designed for the final stage of power delivery, Secondary Protection Relays monitor the secondary distribution network to quickly detect and resolve local system abnormalities, ensuring safety and continuous service.

Indoor instrument transformers

Medium voltage indoor instrument transformers are used for measurement in protection, control, and monitoring systems providing precise and reliable performance in medium voltage applications.

Indoor Sensors

Step towards a smarter and more resource-efficient future with Indoor Sensors (AdvaSense), which use advanced principles to replace conventional transformers, significantly reducing equipment size while increasing safety and functionality.

Frequently Asked Questions

Yes, ABB outdoor instrument transformers are easy to install and friendly to maintain in most of the medium voltage outdoor applications.

Maximum insulation voltage levels of ABB’s medium voltage outdoor IEC instrument transformers are 40.5/95/200 kV for voltage transformers and 52/95/250 kV for current transformers.

Yes, ABB’s medium voltage outdoor IEC instrument transformers can be tailored by specific design modifications, while rating customization is done every time, as our CTs/VTs are manufactured as per customers’ rating requirements.

Yes, ABB’s medium voltage outdoor IEC instrument transformers are available in hydrophobic cycloaliphatic epoxy resin as an insulation medium.

Yes, ABB’s medium voltage outdoor instrument transformers can be used in pole-mounted primary metering units.

Yes, ABB’s medium voltage outdoor instrument transformers are compatible with outdoor switch disconnectors, manufactured by ABB or by other suppliers.

Yes, ABB's medium voltage outdoor IEC instrument transformers comply with the latest versions of the IEC 61869 standards.

Yes, some of ABB's medium voltage outdoor IEC instrument transformers can be manufactured compliant with the latest IEEE C57.13 or CAN/CSA-C61869 standards.

ABB’s medium voltage outdoor IEC instrument transformers have their own routine test reports according to the relevant standard as stated on the product’s label. Based on special request, ABB’s medium voltage outdoor instrument transformers can be calibrated in an accredited laboratory.

ABB’s medium voltage outdoor instrument transformers have an expected minimum lifetime of 30 years.

Yes, ABB has a global installed base of medium voltage outdoor instrument transformers. Please feel free to contact our sales representatives for further information.