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LMK1(BH)-0.66 current transformer

0102030405

China LZZB9-24/220b/2(Series Current Transformers - Reliable Suppliers & Factory for 50Hz/60Hz Power Systems

The LZZB9-24/220b/2(series current transformers are designed for power systems operating at a rated frequency of 50Hz or 60Hz and a rated voltage of 20kV. These high-quality transformers are essential for electric energy metering, current measurement, and relay protection in various applications. Manufactured in China, we adhere to rigorous production standards, specifically GB20840.1-2010 and GB20840.2-2014, ensuring reliability and accuracy. As a leading supplier and factory, we are committed to delivering state-of-the-art current transformers to meet your energy management needs

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Product Detail

🔖 Model and its meaning

📌 Summarize

⚡ Measurement accuracy is another crucial aspect of current transformers that cannot be ignored. 15-40.5kV indoor current transformers can achieve measurement accuracy of 0.2 seconds or 0.5 seconds, which is essential for accurately converting large primary currents into controllable secondary currents. This accuracy is critical for electricity metering and current measurement, as it ensures the reliability of the collected data and its practical application value. In an era where energy efficiency and accurate billing are paramount, the role of high-precision current transformers is becoming increasingly prominent.

🛡️ Current transformers have applications far beyond measurement; they are an integral part of relay protection systems, ensuring the safety of the power grid. By providing accurate current readings, these transformers enable protective relays to operate effectively, ensuring the timely detection and handling of any anomalies in the power system. This protective capability is crucial for preventing equipment damage and maintaining the overall integrity of the power infrastructure.

🌡️ Normal Service Condition

🏢

Installation Site Indoor

🌡️

Ambient Temperature Max 40℃ · Min -5℃ · Daily avg ≤ 30℃

🌫️

Atmospheric Conditions No severe pollution in the atmosphere

📊 Technical Parameter

LZZB9-24/220b/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
LZZB9-24/220b/2	20	0.2/0.2 0.2/0.5 0.2/10P10 0.5/10P10 0.2/10P15 0.5/10P15	10/10 10/10 10/20 10/20 10/15 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 0.2/0.5 0.2/10P10 0.5/10P10 0.2/10P15 0.5/10P15	10/10 10/10 10/20 10/20 10/15 10/15	63	130
	800			63	130
	1000			80	160
	1200
	1250
	1500	0.2/0.2 0.2/0.5 0.2/10P10 0.5/10P10 0.2/10P15 0.5/10P15 0.2S/10P30	10/10 10/10 10/20 10/20 10/15 10/15 15/15	100	160
	1600
	2000
	2500

LZZB9-24/220b/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
LZZB9-24/220b/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 0.2S/0.5/5P30/5P30	15/15/20 15/20/20 10/20/30 15/20/30 10/15/20 15/15/20 15/15/15/15	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 0.2/0.5/0.5 0.2/10P10/10P10 0.5/10P10/10P10 0.2/10P15/10P15 0.5/10P15/10P15 0.2S/0.5/5P30/5P30	15/15/20 15/20/20 10/20/30 15/20/30 10/15/20 15/15/20 15/15/15/15	63	130
	800			63	130
	1000			80	160
	1200
	1250
	1500	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/0.5/5P30/5P30	15/15/20 15/20/20 10/20/30 15/20/30 10/15/20 15/15/20 15/15/15/15	100	160
	1600
	2000
	2500

⚙️ Rated Secondary Current: 5A or 1A

🔋 Rated Insulation Level: 24 / 65 / 125 kV

🔩 Structure and Characteristics

🏗️

This series of current transformers are of fully enclosed structure with epoxy resin casting, featuring excellent insulation performance and moisture-proof capability. The product features a compact structure, small size, light weight and easy surface cleaning. A terminal box is installed at the secondary output terminal, which is safe and reliable. There are grounding bolts and six installation holes for installation on the product base plate.

❓ Frequently Asked Questions

What is the voltage rating of the LZZB9-24/220b series current transformer?

The LZZB9-24/220b series current transformer has a rated insulation level of 24/65/125 kV, making it suitable for medium-voltage indoor power systems up to 24 kV.

What accuracy levels are available for the LZZB9-24/220b/2 current transformer?

The LZZB9-24/220b/2 supports multiple accuracy level combinations including 0.2/0.2, 0.2/0.5, 0.2/10P10, 0.5/10P10, 0.2/10P15, 0.5/10P15, and for higher current ranges also 0.2S/10P30, to meet various metering and protection requirements.

What is the rated secondary current for this current transformer?

The rated secondary current for the LZZB9-24/220b series is 5A or 1A, which can be selected based on the requirements of the connected metering or protection devices.

What are the allowable ambient temperature conditions for installation?

The transformer is designed for indoor installation where the maximum ambient air temperature does not exceed 40℃, the minimum temperature is no lower than -5℃, and the daily average temperature does not exceed 30℃.

What structural features make the LZZB9-24/220b series reliable and easy to maintain?

The series adopts a fully enclosed epoxy resin cast structure, providing outstanding insulation and moisture resistance. Its compact and lightweight design simplifies installation and surface cleaning. The secondary output terminal is protected by a terminal box, and the base plate includes grounding bolts and six mounting holes for secure installation.

What is the difference between the LZZB9-24/220b/2 and LZZB9-24/220b/4 models?

The main difference lies in the number of secondary cores and the available accuracy level combinations. The /2 model provides dual-core configurations suitable for standard metering and protection, while the /4 model supports triple-core and quad-core combinations (e.g., 0.2/0.2/0.2, 0.2S/0.5/5P30/5P30), offering greater flexibility for complex protection and metering applications.