LMZ(J)1-0.66 Series Low Voltage Current Transformer

¿Qué es un transformador de corriente de baja tensión?

A low voltage current transformer is a professional instrument transformer based on electromagnetic induction principle, specially designed for low-voltage AC power distribution systems. Taking the LMZ(J)1-0.66 type as a typical model, it is applicable to AC circuits with a rated voltage of 0.66kV and a rated frequency of 50Hz. Adopting casting insulation technology and bottom fixed installation structure, this device can proportionally step down high primary current into standard low secondary current (mainly 5A). It serves two core functions: accurate current and electric energy measurement, and reliable relay protection for power circuits. With multiple precision grades including Class 0.2, 0.2S, 0.5 and 0.5S, it meets diverse high-precision measurement and industrial monitoring requirements, and complies with the international standard IEC 61869.

Normativa y repercusiones del transformador de corriente de baja tensión

Condiciones de funcionamiento del transformador de corriente de baja tensión

Installation Site: Designed for indoor installation
Ambient Temperature: The applicable temperature range is -5℃ to 40℃
Ambient Humidity: The relative ambient humidity shall not exceed 80%
Altitude Condition: Applicable for working altitude ≤1000m
-Atmospheric Requirement: The surrounding atmosphere shall be clean without corrosive, conductive and serious polluting impurities, to avoid corrosion of transformer shell and internal coil.

Parámetros del producto

Tabla de productos	Ratio de liquidez corriente (A)
Tabla de productos	Clase 0,5	Clase 0.5S	Clase 0.2	Clase 0.2S
30	100/5	2.5	2.5	2.5	2.5
	150/5	5	5	5	5
	200/5	5	5	5	5
	250/5	5	5	5	5
	300/5	5	5	5	5
40	200/5	5	5	5	5
	300/5	5	5	5	5
	400/5	5	5	5	5
	500/5	5	5	5	5
	600/5	5	5	5	5
50	400/5	5	5	5	5
	500/5	5	5	5	5
	600/5	5	5	5	5
60	500/5	5	5	5	5
	600/5	5	5	5	5
	800/5	10	10	10	10
	1000/5	10	10	10	10
80	750/5	10	10	10	10
	800/5	10	10	10	10
	1000/5	10	10	10	10
	1200/5	10	10	10	10
	1500/5	10	10	10	10
100	750/5	10	10	10	10
	800/5	10	10	10	10
	1000/5	10	10	10	10
	1200/5	10	10	10	10
	1500/5	10	10	10	10
	2000/5	10	10	10	10
125	1500/5	10	10	10	10
	2000/5	10	10	10	10
	2500/5	15	15	15	15
	3000/5	20	20	20	20
140	3000/5	20	20	20	20
	4000/5	30	30	30	30
	5000/5	40	40	40	40
	6000/5	40	40	40	40

¿Por qué elegir los transformadores de corriente de baja tensión de ZHIMING?

High Measurement Accuracy with Multiple Precision Grades

This series of low voltage current transformers is equipped with four mainstream precision grades: Class 0.2, 0.2S, 0.5 and 0.5S. It can meet the metering demands of different scenarios from ordinary industrial monitoring to high-precision electric energy measurement.

Excellent Insulation & Durable Structural Design

Adopting integral casting insulation process, the product has good compression resistance, corrosion resistance and insulation performance. The sealed structure effectively isolates dust and moisture, reduces internal component aging rate, and adapts to long-term continuous operation in indoor power distribution environments.

Complete Current Ratio & Wide Application Range

The low voltage current transformer covers abundant current ratio specifications, ranging from 100/5A to 6000/5A. The secondary load is graded into 2.5VA, 5VA, 10VA, 15VA, 20VA, 30VA and 40VA according to different calibers.

High Safety & Stable Operational Performance

Complying with IEC 61869 international standard, the product has standardized electrical performance. It realizes electrical isolation between primary high-current circuit and secondary measuring equipment, effectively preventing high current from damaging measuring instruments and avoiding electric leakage risks.

Simple Installation & Low Maintenance Cost

The compact integrated structure and bottom fixed mounting design simplify the installation steps without complex auxiliary accessories. The casting insulation shell is wear-resistant and anti-aging, free of frequent maintenance.

Preguntas frecuentes

What is the applicable voltage and frequency of this low voltage current transformer?

This product is a low-voltage current transformer, with a rated working voltage of 0.66kV and a rated power frequency of 50Hz. It is only suitable for indoor AC low-voltage circuits, and cannot be used for high-voltage power systems beyond the rated voltage.

What do the precision grades (0.2/0.2S/0.5/0.5S) mean and how to choose?

These grades represent measurement accuracy. Class 0.2 and 0.2S are for high-precision electric energy metering scenarios such as commercial electricity settlement; Class 0.5 and 0.5S are suitable for conventional industrial current monitoring and general circuit relay protection. The S-grade models have higher accuracy under light load conditions.

What are the limitations of the working environment for this low voltage current transformer?

It must be installed indoors, with ambient temperature between -5℃ and 40℃, humidity ≤80%, and working altitude not exceeding 1000m. Besides, it cannot be placed in an atmosphere with corrosive gas and serious dust pollution to prevent insulation damage.

How to select the appropriate current ratio and secondary load?

Select the current ratio according to the actual operating current of the primary circuit (the actual current shall be within the rated current range of the transformer). The secondary load is matched by caliber: small caliber (30/40/50) is equipped with 2.5VA-5VA load, medium and large caliber (60/80/100) with 10VA load, and ultra-large caliber (125/140) with 15VA-40VA load.

What are the advantages of casting insulation structure compared with low voltage current transformers?

The casting insulation structure has integral sealing performance, which is dust-proof, moisture-proof and corrosion-resistant. It has better insulation strength, effectively avoiding electric breakdown. Meanwhile, it features strong shock resistance, no loose internal coil, stable long-term operation and longer service life, perfectly adapting to complex indoor power distribution working conditions.