Current Transformers
Introduction
Instrument transformers are current & voltage devices that are widely used in Measurement and protective applications to change the current & voltage levels from one magnitude to another. They are also used for isolation between high voltage power circuit and measuring instruments. This not only ensures safety of the operator but also of the end device in use.
The Current Transformer is an instrument transformer used in AC power systems; designed to reduce high voltage current to a significantly lower value; ie. 5A, or 110-120V that can be measured using smaller rated measuring instruments such watthour meter, ammeter, or protection relay.
KS Instruments can design and manufacture high accuracy LT Current transformers for measuring and protection applications in tape wound, resin cast and ABS enclosure constructions. KSI has a wide range of catalogue products to suit all needs. These products have been validated by our clients for high efficiency, robust performance and long service life.
Features
- Designed asper IS-16227, C-57 or Customer Requirement.
- Secondary Current 5A or 1A.
- Primary Current up to 5000A.
- Secondary Burden 1VA to 30VA.
- Dual Ratios can be offered.
- High accuracy on request
- Mounting arrangement on request
Construction Style
- Varnishes Fiber glass tape
- PVC Tape Insulated
- Resin cast
- ABS or Glass filled Nylon Moulded
How to Specify/Select
Here are some things we will need to know before we can provide a quote:
- Transformer Ratio: (Primary /Secondary Current)
- Output (Burden)
- Class of accuracy (0.2, 0.5, 0.5s, 1)
- Construction Style: (ring type, plastic case, resin cast)
- Application - indoor/outdoor
- Mounting Clamps Required? (Optional)
Certifications & Approvals
- Routine Test
- Short Time Current Test
- Dynamic Current test
- Temperature Rise Test
- Central Power Research Institute Bengaluru
- Request for Test Report
- IS-16227 Part-1,2
- IEC 61869
- IS-2705
Application
Panel & Switchgear
Current Transformers play the role of measurement and protection circuit. As a Measuring Current Transformer, it can lower the high current in control panels & panel boards at a pre-determined ratio such as 100:1. Offered as Ring type, also called as window type, allow bus bars or cables to be passed through the CT and act as a Primary for the CT. The safe, low VA burden and click fit CT makes it very convenient to use in retrofit applications without disconnecting any cable. This saves down-time period and revenue loss which would occur due to shut down of plant during installation of CT.
These Current Transformers in protective applications are used to activate the protective relay in case of a fault current and isolate a part of or the full system from the main supply.
Products
Wound Primary Measuring Current Transformers
KWM SERIES
- Ratio Range : 50/5 or 1A to 200/5 or 1A
- Standard Accuracy Class : CL-5, CL-3, CL-1, CL-0.5, CL-0.2, CL-0.1, CL-0.5S & CL-0.2S
Wound Primary Protective Current Transformers
KWP SERIES
- Ratio Range : 50/5 or 1A to 200/5 or 1A
- Standard Accuracy Class : 5P, 10P, 15P, Special – PS and XPS
Ring Type Measuring Current Transformers
KRM SERIES
- Ratio Range: 50/5 or 1A to 5000/5 or 1A
- Standard Accuracy Class: CL-5, CL-3, CL-1, CL-0.5, CL-0.2, CL-0.1, CL-0.5S & CL-0.2S
Ring Type Protective Current Transformers
KRP SERIES
- Ratio Range :50/5 or 1A to 5000/5 or 1A
- Standard Accuracy Class : Standard – 5P, 10P, 15P, Special – PS and XPS
Summation Measuring Current Transformers
KSUM SERIES
- Ratio Range : 5+5+5/5A, 5+5/5A, 1+1+1/1A, 1+1/1A
- Standard Accuracy Class :CL-1, CL-0.5, CL-0.2
Summation Protective Current Transformers
KSUP SERIES
- Ratio Range : 5+5+5/5A, 5+5/5A, 1+1+1/1A, 1+1/1A
- Standard Accuracy Class : 5P, 10P, 15P
Don't see what you're looking for?
KS Instruments has an expert design engineering team that can design and manufacture custom components for your specific Current Transformer applications. Do visit our Custom LTCT product designs here
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