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LZZB9-24/180b/2(4) 24kV Indoor CT for Metering & Protection

The LZZB9-24/180b/2(4) series current transformers are suitable for power systems with a rated frequency of 50Hz or 60Hz and a rated voltage of 20kV. They are widely used in the power industry, mainly for important functions such as energy metering, current measurement, and relay protection, to ensure the safe and stable operation of the power system. The design of this equipment fully considers reliability under high-voltage environments, effectively meets the needs of different power applications, and provides users with accurate current measurement and monitoring.

The product execution standards are GB20840.1-2010 and GB20840.2-2014.

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Product Detail

Dimensional Drawing

Model and its meaning

LZZB9-24-180b-2(4).jpg

Summarize

A key highlight of the 15-40.5kV indoor current transformer is its superior insulation performance. Rated insulation voltages up to 40.5/95/185kV, these transformers are designed to withstand the harsh conditions of high-voltage environments. For example, the creepage distance of the LZZB9-35 and 40.5 type current transformers is as long as 851mm, effectively preventing insulation breakdown. This characteristic is crucial for ensuring the safe and reliable operation of the transformer, as it minimizes the risk of electrical faults that could lead to catastrophic failures.

In addition to its superior insulation performance, this current transformer also boasts excellent environmental adaptability. Its design resists pollution and humidity, making it suitable for harsh indoor environments. This adaptability is crucial for maintaining performance in a variety of climates, including tropical regions. This 15-40.5kV indoor current transformer operates normally within a temperature range of -5℃ to 40℃, further highlighting its versatility and enabling its widespread application and stable performance in diverse environments.

Normal service condition

Installation location: Indoor, suitable for use in various environments such as power equipment and control rooms, to ensure the safe and stable operation of equipment and provide good working conditions.

Ambient temperature: Maximum temperature 40℃; minimum temperature -5℃; daily average temperature not exceeding 30℃, to adapt to climate changes in different seasons, ensure normal operation of equipment under various temperature conditions, and avoid performance impact due to excessively high or low temperatures.

Atmospheric conditions: The atmosphere is free of severe pollution, ensuring that the equipment operates in a good environment, thereby improving its reliability and service life, reducing the possibility of failure, and ensuring the stability of the power system.

Technical parameter

LZZB9-24/180b/2 technical parameter table of type Current transformer

Product model	Rated primary current	Accuracy level combination	Rated output	Rated short-term thermal current	Rated dynamic stability current
LZZB9-24/180b/2	20	0.2/0.2 0.2/0.5 0.2/10P10 0.5/10P10 0.2/10P15 0.5/10P15	15/15 15/20 10/20 15/20 10/15 15/15	3	7.5
	30			4.5	11.25
	40			6	15
	50			7.5	18.75
	75			11.25	28.125
	100			15	37.5
	150			22.5	56.25
	200			31.5	80
	300			45	112.5
	400
	500
	600	0.2/0.2 0.2/0.5 0.2/10P10 0.5/10P10 0.2/10P15 0.5/10P15 0.2S/10P30	15/15 15/20 10/20 15/20 10/15 15/15 15/15	63	130
	800			63	130
	1000			80	160
	1200
	1250

Rated secondary current: 5A or 1A.

Rated insulation level: 24/65/125kV

LZZB9-24/180b/4 technical parameter table of type Current transformer

Product model	Rated primary current	Accuracy level combination	Rated output	Rated short-term thermal current	Rated dynamic stability current
LZZB9-24/180b/4	20	0.2/0.2/0.2 0.2/0.5/0.5 0.2/10P10/10P10 0.5/10P10/10P10 0.2/10P15/10P15 0.5/10P15/10P15	10/10/10 10/10/10 10/15/15 10/15/15 10/10/15 10/10/15	3	7.5
	30			4.5	11.25
	40			6	15
	50			7.5	18.75
	75			11.25	28.125
	100			15	37.5
	150			22.5	56.25
	200			31.5	80
	300			45	112.5
	400
	500
	600	0.2/0.2/0.2 0.2/0.5/0.5 0.2/10P10/10P10 0.5/10P10/10P10 0.2/10P15/10P15 0.5/10P15/10P15 0.2S/0.5/15P30/15P30	10/10/10 10/10/10 10/15/15 10/15/15 10/10/15 10/10/15 15/15/15/15	63	130
	800			63	130
	1000			80	160
	1200
	1250

Structure and characteristics

This series of current transformers features a fully enclosed epoxy resin casting structure, providing excellent insulation and moisture resistance, ensuring stable operation under various environmental conditions. The product boasts a compact structure, small size, light weight, and easy surface cleaning, facilitating daily maintenance and management. A terminal box is installed at the secondary output terminals, ensuring safety and reliability and effectively preventing wiring faults. The base plate includes a grounding bolt and six mounting holes, a rational design that allows for flexible installation and fixation to meet diverse installation needs.

1.LZZB9-24-180b-2(4).jpg 2.LZZB9-24-180b-2(4).jpg