Indoor ITs

Grid components

Indoor ITs

Indoor Current Transformers & Voltage Transformers

Protecting an evolving Indoor grid 

 

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

ABB’s medium voltage indoor instrument transformers portfolio is highly versatile, offering a wide range of dimensions, designs, and ratings that can be tailored to meet customers' precise specifications, ensuring the perfect fit for their installations. Our portfolio, for IEC and other standards, is ideal for various medium voltage indoor applications, where air or gas-insulated medium voltage switchgear are the main installations, but also for compact secondary substations, motors and generators, dry-type transformers, and capacitor banks. As part of our portfolio, ABB offers the following product lines: 

  • Indoor current transformers, up to 40.5 kV for metering, protection or zero-measurement purposes. The available designs include block type, bus type, and cable type current transformers.
  • Indoor voltage transformers, up to 40.5 kV for metering, protection or external power supply. The main designs are single-pole and double-pole voltage transformers. Single-pole transformers can be equipped with or without a fuse.

ABB medium voltage indoor instrument transformers are available for original equipment manufacturers (OEMs), panel builders and non-panel builders’ applications, Engineering, Procurement and Construction (EPC) partners, as well as end-users to incorporate them in their 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.


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ABB's portfolio for indoor instrument transformers

IEC & Other standards

Current transformers
Cable CTs
0-current CTs
Voltage transformers
Metal coated VTs

Indoor block and bus type current transformers for phase measurement

TPU_270

TPU

TPU, up to 40.5 kV, are block type current transformers cast in epoxy resin with rated primary currents up to 3,200 A. TPU act as a support of the busbar and offer the possibility of built-in capacity divider for voltage indication. Upon request, these products can be designed as secondary or primary reconnectable.

TPU are ideal for medium voltage switchgear such as UniGear, UniSec and SafeRing, but equally for other applications such as  Compact Secondary Substations, Motors & Generators, Drives, metal enclosed capacitor banks and dry type transformers.

Learn more:
TPU 4 up to 12 kV
TPU 5 up to 17.5 kV
TPU 6 up to 27.5 kV
TPU 7 up to 40.5 kV

For the Manual and other useful product documents, please visit TPU – ABB Library


KOKS_270

KOKS

KOKS, up to 17.5 kV, are bus type current transformer cast in epoxy resin without a primary conductor, but with medium voltage insulation and with rated primary currents up to 4,000 A.

KOKS are ideal for medium voltage primary air-insulated switchgear with higher nominal primary currents such as UniGear ZS1 . They can also be used in Motors & Generators.

Learn more:
KOKS

For the Manual and other useful product documents, please visit KOKS – ABB Library

 

Indoor cable current transformers for phase measurement

TPU_270

KOKM for primary GIS

KOKM 072, up to 0.72 kV, and KOKM 1, up to 1.2 kV, are epoxy cast indoor cable current transformers ideal for phase current measurements in medium voltage primary gas-insulated switchgear ( see  ABB’s portfolio here). Due to high dimensions variability, they are designed to fit up to two medium voltage bushings, busbars or cables, which act as the primary conductors.

Learn more:
KOKM1

For the Manual and other useful product documents, please visit KOKM – ABB Library

 

KOKMforSGIS_270

KOKM for secondary GIS

KOKM 072, up to 0.72 kV, are indoor cable current transformers having thermoplastic housing and resin insulation. They are ideal for phase current measurements in medium voltage secondary gas-insulated switchgear (see ABB’s portfolio here SafeRing & SafePlus). They are designed to be installed on the medium voltage cables, which act as the primary conductors.

Learn more:
KOKM 072

For the Manual and other useful product documents, please visit KOKM – ABB Library

 

KOKM_270

KOKM

KOKM up to 1.2 kV, are highly versatile indoor cable current transformers, ideal for measuring either phase or residual current in air- or gas-insulated medium voltage switchgear. Other applications include motors and generators and dry-type transformers.

The KOKM series has high dimensional variability, with an inner diameter ranging from 33 to 500 mm and a length ranging from 60 to 300 mm. Cable, busbar or bushing serves as the primary conductor and must be insulated for the medium voltage application.

Learn more:
 KOKM

For the Manual and other useful product documents, please visit KOKM – ABB Library


 

BD 00_270

BD 00

BD 00, up to 0.72 kV, are indoor cable current transformers mostly having a thermoplastic housing. They are ideal for phase current measurements in medium voltage air- or gas-insulated switchgear (see ABB’s portfolio here UniSec) . They are designed to fit insulated medium voltage busbars or cables, which act as the primary conductors. The oval variant of the BD 00 can fit two insulated medium-voltage cables. These products are used in ABB's UniSec and also SafePlus switchgear.

Learn more:
BD 00

For the Manual and other useful product documents, please visit BD 00 – ABB Library

 

Indoor cable current transformers for residual measurement

KOKM 06

KOKM 06

KOKM 06, up to 0.72 kV, are rectangular types of epoxy cast indoor cable current transformers ideal for measurement of zero currents with multiple insulated medium voltage cables in medium voltage air- or gas-insulated switchgear. Our KOKM 06 portfolio is available in various dimensions with an inner diameter ranging from 200x300 mm to 450x650 mm. 

Learn more:
KOKM 06

For the Manual and other useful product documents, please visit KOKM – ABB Library

 

KOLMA

KOLMA/ KOLA

KOLMA and KOLA, both up to 0.72 kV, are specific types of epoxy cast cable indoor current transformers ideal for measurement of zero currents of insulated medium voltage cables in medium voltage air- or gas-insulated switchgear.

Both products are designed for use with earth-fault Protection relays. The KOLMA can be configured as a single-ratio or multi-ratio version. The KOLA is manufactured as a split-core type.

Learn more:
KOLMA/KOLA

For the Manual and other useful product documents, please visit KOLMA – ABB Library, KOLA – ABB Library

Indoor voltage transformers

TJC

TJC/ TJCH

TJC/ TJCH, up to 40.5 kV, are medium voltage indoor voltage transformers cast in epoxy resin and equipped with no fuse. TJC/TJCH are single-phase voltage transformers that are intended to have one end of their primary winding directly earthed. TJCH are achieving higher burden values compared to TJC.

TJC/TJCH are ideal for medium voltage switchgear (see ABB’s portfolio here UniGear, UniSec and SafePlus), Compact Secondary Substations, Motors & Generators, Drives and metal enclosed capacitor banks. These products are fully compatible with ferroresonance protection device VT Guard Pro/Pro-D when connected in open-delta configuration.

Learn more:
TJC 4 up to 12 kV
TJCH 4 up to 12 kV
TJC 5 up to 17.5 kV
TJCH 5 up to 17.5 kV
TJC 6 up to 27.5 kV
TJC 7.1 up to 40.5 kV

For the Manual and other useful product documents, please visit TJC(H) – ABB Library


 

TJP_TJPH_270

TJP/ TJPH

TJP/ TJPH, up to 40.5 kV, are medium voltage indoor voltage transformers that are cast in epoxy resin. They are vastly delivered with a fuse. TJP/ TJPH are single-phase voltage transformers intended to have one end of their primary winding directly earthed. TJPH are achieving higher burden values compared to TJP.

TJP/ TJPH are ideal for medium voltage switchgear (see ABB’s portfolio here UniGear), Compact Secondary Substations, Motors & Generators, Drives and metal enclosed capacitor banks.

TJP/TJPH are available for fixed installations or voltage transformer withdrawable trucks. These products offer variable fuses and fuse-holders’ orientation, as well as fuses with or without a striker pin indication. These products are fully compatible with ferroresonance protection device VT Guard Pro/Pro-D when connected in open-delta configuration.

Learn more:
TJP 4 up to 12 kV
TJPH 4 up to 12 kV
TJP 5 up to 17.5 kV
TJPH 5 up to 17.5 kV
TJP 6 up to 27.5 kV
TJP 7.x up to 40.5 kV

For the Manual and other useful product documents, please visit TJP(H) – ABB Library


 

TDC_270

TDC

TDC, up to 25 kV, are medium voltage indoor voltage double-pole transformers, cast in epoxy resin. All parts of TDC’s primary winding, including terminals, are insulated from the earth at a level corresponding to its rated insulation voltage level.

TDC are ideal for medium voltage air-insulated Switchgear,  Motors & Generators, Drives and metal enclosed capacitor banks. These products could also be used for an external power supply.

Learn more: 
TDC 4 up to 12 kV
TDC 5 up to 17.5 kV
TDC 6 up to 25 kV

For the Manual and other useful product documents, please visit TDC – ABB Library

 

 

VT GUARD PRO

Accessories - VT Guard

VT Guard PRO are an advanced security devices that protect medium voltage inductive single-pole voltage transformers against ferroresonant oscillations. Ferroresonant oscillations may be initiated by transient events such as switching operations, in power networks. The protection occurs by proper and prompt damping action, without causing excessive power consumption during normal network operation. VT Guard Pro completely replace the damping resistor being connected in an open-delta configuration and are available in two versions:

  • VT Guard Pro
  • VT Guard Pro–D, which, in addition to all the functionalities offered by VT Guard Pro, has extended functions that allow self-diagnosis and cooperation with a superior system.

Learn more:
 VT Guard Pro / VT Guard Pro-D

For the Manual and other useful product documents, please visit VT Guard Pro/Pro-D – ABB Library

 

Indoor metal-coated voltage transformers

TJM_270

TJMC 7

TJMC 7, up to 40.5 kV, are medium voltage indoor single-pole voltage transformers. They are cast in epoxy resin and further metal-coated to achieve a touch-proof design. TJMC 7 are ideal for ABB’s medium voltage primary gas-insulated switchgear ZX2. TJMC are designed to fit primary gas-insulated switchgear cable and busbar compartments. 

Learn more:
TJMC 7.x

For the Manual and other useful product documents, please visit TJMC 7 – ABB Library

 

TJMC_TJMP_270

TJMP / TJMC 6

TJMP 4, up to 12 kV, TJMC 6 and TJMP 6, up to 24 kV, are medium voltage indoor single-pole voltage transformers. They are cast in epoxy resin and metal-coated to achieve a touch-proof design. All three products are ideal for ABB’s medium voltage primary gas-insulated switchgear PrimeGear ZX0. TJMC and TJMP are designed to fit switchgear cable compartment and are compatible with NKT busbars. TJMP can be equipped with the replaceable fuse with various ratings.

Learn more:
TJMP/ TJMC 6

For the Manual and other useful product documents, please visit TJMC/TJMP – ABB Library

 

TDMC_270

TDMC 6

TDMC 6, up to 24 kV, is a medium voltage indoor double-pole voltage transformer. It is cast in epoxy resin and metal-coated to achieve a touch-proof design. TDMC 6 is equipped with C-type primary connections and is ideal for medium voltage gas-insulated switchgear. TDMC 6 is designed to be used for external power supply in new or retrofit installations, for example SafeRing & SafePlus.

Learn more:
TDMC 6.0 C

For the Manual and other useful product documents, please visit TDMC – ABB Library

 

VT GUARD PRO

Accessories - VT Guard

VT Guard PRO are an advanced security devices that protect medium voltage inductive single-pole voltage transformers against ferroresonant oscillations. Ferroresonant oscillations may be initiated by transient events such as switching operations, in power networks. The protection occurs by proper and prompt damping action, without causing excessive power consumption during normal network operation. VT Guard Pro completely replace the damping resistor being connected in an open-delta configuration and are available in two versions:

  • VT Guard Pro
  • VT Guard Pro–D, which, in addition to all the functionalities offered by VT Guard Pro, has extended functions that allow self-diagnosis and cooperation with a superior system.

Learn more:
 VT Guard Pro / VT Guard Pro-D

For the Manual and other useful product documents, please visit VT Guard Pro/Pro-D – ABB Library

 


Product Scope

Click the arrow to learn more about product scope.
 TPU_270KOKS_270KOKM_270TPU_270KOKMforSGIS_270BD 00_270KOKM 06KOLMA
 TPUKOKSKOKMKOKM for PGISKOKM for RMUBD 00KOKMKOLMA/KOLA
Max.rated voltage
TPU 4   12 kV
TPU 5   17.5 kV
TPU 6   27.5 kV
TPU 7   40.5 kV
KOKS 12   12 kV
KOKS 17.5   17.5 kV
KOKM 1   1.2 kV
KOKM 072   0.72 kV
KOKM 1   1.2 kV
KOKM   0.72 kV
BD 00   0.72 kV
KOKM 06   0.72 kV
KOLMA   0.72 kV
KOLA   0.72 kV

Max.rated
primary current
3 200 A 
4 000 A 
10 000 A
3 000 A 
1 250 A 
1   250 A
2 000 A1 250 A
Max.rated short-time current
100 kA / 1 s 
90 kA / 1 s 
100 kA / 1 s 
63 kA / 1 s 
25 kA / 3 s 
31,5 kA / 3 s
100 kA / 1 s 60 kA / 1 s
Max.quantity of cores
6 cores 6 cores 3-5 cores 3-5 cores 1-2 cores 1-2 cores 1 core 1 core
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,
IEEE, CAN/CSA
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, IEEE, CAN/CSA
IEC, VDE, ČSN,
AS, BS, GOST,
IEEE, CAN/CSA

IEC, VDE, ČSN, AS, BS, GOST,
IEEE, CAN/CSA
Applications
MV switchgear,
compact secondary
substations, motors & generators, drives, metal encl. capacitor banks, dry type
transformers
MV primary air-insulated switchgear,
motors & generators
MV air-insulated
switchgear, motors & generators, drives, CSS, MECB, dry type  transformers
MV primary gas-insulated switchgear, designed to fit MV cables, busbars or bushings
MV secondary gas-        insulated switchgear,
designed for MV cables in the cable
compartments
MV air or gas
switchgear, designed
for MV cables or busbar incl. variant
for 2x MV cables
MV air or gas
insulated
switchgear,
designed for
measurements of zero currents with multiple MV cables

MV air or gas
insulated switchgear,
designed for
measurements of zero currents of MV cables
Features
Support type,
opt.reconnection,
capacitive divider, various dimensions,
ribs, sealable sec.
terminal cover
CT without primary
conductor insulated
for the MV
application, opt. secondary
reconnectable

High dimensions
variability, inner Ø
33~500 mm, length 60~300 mm, opt. sec.reconnectable,
sealable term. cover
High dimensions
variability incl. variant for 2x MV cables or bushings, opt. sec. reconnectable,
sealable sec. covers
Inner Ø 42, 50 or 60 mm, variant for self-powered relays, opt.
secondary
reconnection, opt. sealable sec. covers
Inner Ø 59, 69, 70, 85 or 110 mm, opt. secondary
reconnection, BD 00 opt. sealable IP40 sec. cover
6x dimension
variants, from inner Ø 200x300 mm up to 450x650 mm, opt. secondary
reconnection
Designed for use with earth-fault protection
relays. KOLMA single or multiratio variants. KOLA split-core type

 

 TJCTJP_TJPH_270TDC_270TJM_270TJMC_TJMP_270TDMC_270 VTS
 TJC/TJCHTJP/TJPHTDCTJMC TJMC/TJMP TDMC VT Guard Pro/-D
Max.rated voltage
TJC(H) 4   12 kV
TJC(H) 5   17,5 kV
TJC 6      27,5 kV
TJC 7      40,5 kV
TJP(H) 4    12 kV
TJP(H) 5    17,5 kV
TJP 6     27,5 kV
TJP 7    40,5 kV
TDC 4    12 kV
TDC 5   17,5 kV
TDC 6   25 kV
TJMC 7 40,5 kV 
 TJMP 4   12 kV
TJMC 6    24 kV
TJMP 6    24 kV

TDMC 6   24 kV
Rated
operational
voltage

100/110 V

Max.rated
primary voltage
36 000: √3 kV
36 000: √3 kV
22 000 kV
36 000: √3 kV
22 000: √3 kV
22 000 kV
Max. oper.
current

10 A/0.2 s
Min.rated voltage factor
1,9x Un / 8h
1,9x Un / 8h 
1,2x Un /
Continuous

1,9x Un / 8h 
1,9x Un / 8h  
1,2x Un /
Continuous

Voltage range
0-110 V

 
Max.quantity of windings
3-4 windings3-4 windings2 windings3 windings3 windings2 windings
Threshold
voltage

20; 25; 30 V

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, IEEE, CAN/CSA

IEC, VDE, ČSN, PN, AS, BS, GOST

IEC, VDE, ČSN, PN, AS, BS, GOST

IEC, VDE, ČSN, PN, AS, BS, GOST

Time delay
0,4; 1,4; 2,4; 3,4s

Applications
MV switchgear,
compact secondary
substations, motors & generators, drives, metal encl. capacitor
banks
MV switchgear,
compact secondary
substations, motors & generators, drives, metal encl. capacitor
banks
MV air-insulated
switchgear, motors &
generators, drives, metal encl. capacitor
banks
ABB MV primary SF6
gas-insulated
switchgear, TJMC designed to fit  switchgear cable and
busbar compartments
ABB MV primary SF6
free gas-insulated
switchgear, TJMC/P
designed to fit
switchgear cable and
busbar
compartments
MV gas-insulated
switchgear, designed
for the external
power supply in new or retrofit
installations

Applications 
Designed for MV indoor single-pole
VTs and open-delta
connection. Protect VTs against
ferroresonance
phenomena
Features
Directly grounded sec. terminals with sealable cover, opt. reconnection, suitable for VT Guard Pro/Pro-D
 
In addition to TJC: ready for VT trucks, variable fuses and fuse-holder orientation, fuse w/wo indications
Directly grounded sec. terminals with sealable cover, opt. 2 primary voltage reconnection
Touch proof design, plug size 2 primary, opt. secondary plug-in, sealable sec. terminals cover or socket 
Touch proof design, primary ½ C cone, sealable sec. terminals cover, opt. build in fuse with various ratings 
Touch proof design, 2x primary C cones, sealable sec. cover, working ambient temperature as low as -35°C
Features 
Replace the dumping
resistors, installed in
the LV compartment,
high reliability,
redundancy circuits, Pro-D self-diagnosis


Related offering


switchgear400x200
MV Switchgear
unipackg400x200
Compact secondary substations
Motor_gener
Motor & Generators
drives
Drives
Primary Protection Relays
Primary protection relays
Sec protection relaysGC
Secondary protection relays

FAQ

1. Can ABB’s medium voltage indoor instrument transformers work in non-ABB installations?

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

2. What is the maximum insulation voltage level of ABB’s medium voltage indoor IEC instrument transformers?

Maximum insulation voltage levels of ABB’s medium voltage indoor IEC instrument transformers are 40.5/95/200 kV.

 

3. Which customers typically use and install ABB’s medium voltage indoor instrument transformers?

ABB medium voltage indoor instrument transformers are typically used by original equipment manufacturers (OEMs), panel builders and non-panel builders’ applications, Engineering, Procurement and Construction (EPC) partners, utilities, as well as end-users. The transformers can be incorporated into installations or retrofit and upgrade projects.

4. Can ABB’s medium voltage indoor IEC instrument transformers be tailored to specific customer needs?

Yes, ABB's medium voltage indoor IEC instrument transformers specifications can be tailored to market or customer needs. For example, the electrical ratings are customized every time.

5. Can ABB’s indoor medium voltage IEC instrument transformers be used in non-panel builders’ switchgear installations?

Yes, ABB indoor medium voltage instrument transformers can be used in non-panel builders’ installations such as compact secondary substations, motors and generators, dry-type transformers, capacitor banks, metal-enclosed capacitor banks, generator circuit breakers, and others.

6. Do ABB’s medium voltage indoor IEC instrument transformers comply with the IEC standards?

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

7. Can ABB’s medium voltage indoor IEC instrument transformers be manufactured compliant with other standards, for example IEEE or CAN/CSA standard?

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

8. Can ABB’s medium voltage indoor IEC instrument transformers be calibrated for metering purposes?

ABB’s medium voltage indoor medium voltage 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 indoor instrument transformers can be calibrated in an accredited laboratory.

9. What is the expected lifetime of ABB’s medium voltage indoor instrument transformers?

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

10. Can ABB’s medium voltage indoor IEC instrument transformers be delivered worldwide?

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

 

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