What is the difference between metering and protection CTs?

Metering CTs are accurate at normal load currents; protection CTs stay accurate at high fault currents so relays operate correctly.

What information is needed for a CT or VT quotation?

Give the ratio, accuracy class, burden, system voltage, indoor or outdoor installation and standard.

Can instrument transformers be supplied for existing switchgear?

Yes. Share the existing dimensions and ratings so replacements match.

Instrument Transformer Supplier and Exporter

We supply current transformers and voltage transformers for revenue metering, protection and control, in indoor and outdoor designs. Ratios, accuracy classes and burdens are matched to your meters and protection relays.

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Instrument Transformers specifications

Typical specifications buyers request. Exact ratings, availability and lead time are confirmed in each quotation.

Types	Current transformers (CT), voltage transformers (VT / PT), combined units
Metering classes	0.2, 0.2S, 0.5, 0.5S
Protection classes	5P, 10P, PX
Installation	Indoor cast resin or outdoor oil / resin
Voltage range	LV up to transmission voltage

Standards commonly specified

IEC 61869-1
IEC 61869-2 (CTs)
IEC 61869-3 (VTs)
IEEE C57.13

Applications

Where our instrument transformers are typically used.

Substation metering and protection
Switchgear panels
Revenue metering at grid connections
Industrial power monitoring

Before you request a quote

Accuracy class: Revenue metering needs a metering class such as 0.2S; protection needs a protection class such as 5P.
Burden: State the connected burden in VA so the transformer stays accurate.
Ratio: Give the primary and secondary ratio, for example 400/5 A or 11 kV/110 V.

Instrument Transformers: common questions

Related products

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Power TransformersWe supply oil-immersed power transformers for generation step-up, transmission and large industrial substations, built to your MVA rating, voltage class and standard.Distribution TransformersWe supply three-phase and single-phase distribution transformers that step medium voltage down to low voltage for utility networks, buildings and industrial plants.Oil-Immersed TransformersWe supply oil-immersed transformers in hermetically sealed and conservator designs for outdoor substations, utilities and industry.Dry-Type TransformersWe supply cast resin and vacuum-pressure-impregnated dry-type transformers for indoor sites where fire safety and cleanliness matter, such as commercial buildings, hospitals, data centres and tunnels.

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