News | company news | Jul 07,2026
The rapid development of Iraq’s electrical infrastructure has generated a high demand for reliable low-voltage current transformers. New substations, factories, commercial buildings, oil and gas facilities, and renewable energy projects require accurate energy metering systems and reliable protection systems.
Selecting the right 0.66 kV polymer-insulated current transformer involves more than simply choosing the turns ratio. Engineers must also consider installation conditions, ambient temperature, insulation characteristics, measurement accuracy, and long-term stability.
This guide explains how to select the right current transformer for operating conditions in Iraq and provides practical solutions for electrical switchgear, distribution boxes, and industrial applications.
Traditional current transformers with slip rings can degrade in dusty and humid environments, as well as from vibrations and high temperatures. Iraq is susceptible to these environmental conditions.
Current transformers with polymer casings are becoming increasingly popular due to the following advantages:
It requires minimal maintenance.
For electrical panels and indoor distribution boxes, current transformers with cast polymer elements are currently considered one of the most reliable solutions.
Typical applications of 0.66 kV current transformers
0.66 kV current transformers are commonly used in low voltage power supply systems to provide isolation, current measurement, power control and protection.
Typical applications include:
Public distribution sphere
Electricity companies are required to precisely control the current in electrical circuits and distribution systems.
Typical components:
100/5A，150/5A，200/5A，300/5A，400/5A
industrial switchgear
Current transformers are used in industrial plants for the following purposes:
The reliable operation of current transformers directly improves system safety and the readiness of the power plant for operation.
Oil and gas facilities
Oil refineries and manufacturing plants require reliable and durable power converters that can operate reliably even at high temperatures and for extended periods.
Compared to traditional construction methods, polymeric thermal insulation materials exhibit excellent resistance to environmental influences.
Solar power generation system
As Iraq increases investment in renewable energy, low-voltage solar substation switches require the use of precision current transformers (CTs) for metering purposes:
Many buyers focus solely on the ratio of existing to new-build homes, but to make a professional decision, other factors need to be taken into account.
1.Current relationships
Select the nominal current of the primary winding based on the expected system load.
Common options include:
| charging current | It is recommended to use a scanner. |
| 80A | 100/5A |
| 140 A | 150/5A |
| 180A | 200/5A |
| 260A | 300/5A |
| 350 A | 400/5A |
| 500 A | 600/5A |
| 900A | 1000/5A |
| 1500 A | 1500/5A |
Selecting a current transformer with too high a power rating can reduce the accuracy of measurements, while selecting a current transformer with too low a power rating can cause saturation at maximum load.
2.Degree of precision
Different tasks require different levels of precision.
Typical options include:
For consumption-based pricing, it is generally recommended to use the 0.2S level or the 0.5 level.
Protection systems generally require the use of protection quality current transformers.
3.Loading
The charging method must be adapted to the device being connected, for example:
An incorrect selection of the load can reduce the accuracy of the measurement.
4.Assembly workshop
Window-type current transformers are widely used because they are easy to install in electrical panels and control cabinets.
Before selecting a model, engineers should verify the following:
The insulation system has a significant impact on the reliability of current transformers.
High-quality cast resin structures offer the following benefits:
These properties are especially important in Iraq, where electrical appliances are frequently used in adverse environmental conditions.
The LMZW series is designed for low voltage power supply systems.
The LMZW series is designed for accurate current measurement and protection in low voltage systems.
The main features are as follows:
Molten resin insulation
Stable power supply
high insulation resistance
Compact window design
Suitable for electrical panels, motor control centers, distribution cabinets, electricity meters and protection relays.
This product line is designed for use in measurement and protection systems in commercial and industrial electrical networks. The technical specifications correspond to the previously published LMZW product catalog.
Compared to split-type or rod-type current transformers, window-type current transformers offer the following advantages:
They are especially suitable for permanent installation in low voltage electrical panels.
Frequently Asked Questions
What is a 0.66 kV current transformer?
This is a low-voltage instrument transformer that converts a high primary current into a standardized secondary current (usually 5 A) for measurement and protection purposes.
Can resin-based energy converters be used in warm climates?
Yeah.
High-quality cast resin insulating materials possess excellent high-temperature properties and exceptional resistance to moisture and dust, making them suitable for Middle Eastern conditions.
What is the most commonly used key performance indicator (KPI)?
The most common proportions are as follows:
100/5A，200/5A，300/5A，400/5A，600/5A，1000/5A
The optimal ratio depends on the actual load of the system.
Can a current transformer be used for both measurement and protection?
Not always.
Measurement and protection applications often require varying levels of accuracy and core characteristics. Therefore, selecting the right current transformer for a specific application is critical.
Selecting the appropriate 0.66 kV polymer-insulated current transformer can improve measurement accuracy, increase protection, and extend the lifespan of the devices.
When implementing power supply, industrial, commercial and renewable energy projects in Iraq and the Middle East, engineers must evaluate the current load factor, accuracy class, insulation quality, load and installation requirements before making a final decision.
The LMZW series features a cast resin housing, a wide current range, and a compact window design, providing a reliable solution for modern low-voltage power distribution systems.
Compay：HEYI Electrical Co., Ltd.
Brand: HEYI/ASCT
Contact: Bethy
E-mail: heyi@heyiele.com
Tel: 86-13968747975
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