LZZB1-10,LZZB1-10GY type current transformerDetailed product description：

LZZB1-10, LZZB1-10GY type current transformer
1. Model and its meaning



2. Product standards
The product performance complies with the GB1208-1997 national standard, DL/T 725-2000 power industry standard, and IEC185 standard.
3. Structure and specifications
This type of current transformer has a pillar structure and is fully enclosed and cast with epoxy resin. Good resistance to dirt and moisture. This product has two secondary windings. The accuracy limit coefficient of the first secondary winding is 5P20, with an accuracy of 0.2 (or 0.5) level, which can be used for protection or shared for protection and measurement. The accuracy of the second secondary winding is 0.1 level, and it also meets the requirement of 0.2S level, which can be used for measurement or shared by measurement and measurement.
This type of current transformer has multiple transformation ratios: 30/5A (1A), 40/5A (1A), 50/5A (1A), 75/5A (1A), 100/5 A（1A）、150/5A（1A）、200/5A（1A）、300/5A（1A）、400/5A（1A）、 600/5A（1A）、750/5A（1A）、800/5A（1A）、1000/5A（1A）、1200/5A（1A）、 1500/5A（1A）、1600/5A（1A）、2000/5A（1A） varied. The external dimensions of this product are shown in Figure 1 and Figure 3, and the dimensions of the primary winding terminal are shown in Figure 2 and Figure 4.

Figure 1 Outline dimension diagram of products below 1200A


Figure 2 Size diagram of primary winding terminal block for products below 1200A


Figure 3 Outline dimension diagram of products above 1500A

Figure 4 Dimension diagram of primary winding terminal for products above 1500A

4 Product Rating and Technical Parameters
4.1 Rated voltage: 10kV
4.2 Maximum operating voltage: 12kV
4.3 Rated frequency: 50Hz
4.4 Rated primary current: 30 A、40A、50A、75A、100A、150A、200A、300A、400A、600A、750A、800A、1000A、1200A、1500A、1600A、2000A。
4.5 Rated secondary current: 5A or 1A.
4.6 Rated output: 25VA, load power factor of 0.8-1.
4.7 Accuracy level, accuracy limit factor (ALF), and instrument security factor (FS):
4.7.1 First secondary winding (for protection and measurement) 1S1-1S2
The accurate limit coefficients and accuracy levels at various rated outputs are shown in Table 1, and the power factor of the load is COS Φ=0.8-1.

Table 1

primary current	Accuracy limit factor (ALF) of 1S1-1S2 at the following rated outputs				1S1-1S2 accuracy level
	10VA	15VA	20VA	25VA	10VA-25VA
30-800A	5P20	5P15	5P10	5P10	Level 0.5
1000A	5P25	5P20	5P15	5P15	Level 0.2
1200A	5P25	5P20	5P20	5P15	Level 0.2
1500A	5P25	5P20	5P20	5P15	Level 0.2
1600A	5P30	5P20	5P20	5P15	Level 0.2
2000A	5P30	5P25	5P20	5P20	Level 0.2

4.7.2 Second secondary winding (for measurement) 2S1-2S2
The accuracy level and instrument security factor at various rated outputs are shown in Table 2. The power factor of the load is COS Φ=0.8-1.

Table 2

one	Accuracy level and instrument security factor of 2S1-2S2 at the following rated outputs
Rated output VA	10VA	15VA	20VA	25VA
accuracy level	zero point one	zero point one	zero point one	0.2S
Instrument security factor (FS)	ten	ten	ten	ten

4.8 Rated short-time thermal current and rated dynamic stability current, see Table 3.

Table 3

Rated transformation ratio	Rated short-time thermal current (kA)	Rated dynamic stability current (kA)	Weight (kg)
30-100/5A(1A)	fifteen	thirty-seven point five	≤ 20
150/5A(1A)	twenty-two point five	fifty-six	≤ 20
200/5A(1A)	thirty	seventy-five	≤ 20
300-400/5A(1A)	forty-five	one hundred and twelve point five	≤ 20
600-800/5A(1A)	sixty-three	one hundred and twenty	≤ 20
1000-1200/5A(1A)	seventy-five	one hundred and thirty	≤ 20
1500-2000/5A（1A）	ninety	one hundred and forty	≤ 20

4.9 Insulation performance
4.9.1 Rated insulation level of primary winding
A. The maximum voltage of the equipment is 12kV.
B. Rated power frequency withstand voltage: 42kV.
C. Rated lightning impulse withstand voltage: 75kV.
4.9.2 Rated insulation level of secondary winding
The rated short-time power frequency withstand voltage between secondary windings and ground insulation is 3kV.
4.9.3 Insulation resistance
The insulation resistance between the windings of the transformer and between the windings and the ground (or base plate) (measured with a testing instrument with an open circuit voltage of 2500V) shall not be less than 100MW
4.10 Partial discharge level
The partial discharge level meets national standards and does not exceed 50pC at a voltage of 1.2Um (14.4kV).
4.11 Weight: See Table 3.
5. Installation, use and maintenance
5.1 Installation
The external dimensions of products below 1200/5A (1A) are shown in Figure 1, and the dimensions of the primary winding terminal are shown in Figure 2. The external dimensions of products above 1500/5A (1A) are shown in Figure 3, and the dimensions of the primary winding terminal are shown in Figure 4. There are two installation methods, the first one is to use the four M12 installation holes at the bottom of the product to directly install it on the installation plate of the switchgear with screws. The hole size is shown in Figure 5. The second method is to use the four Φ 13 mounting holes on the bottom mounting plate of the product to install with screws and nuts. The hole size is shown in Figure 6. Do not damage the surface of the casting body during installation.
The primary winding terminals P1 and P2 of this product are on the upper part, with silver plating on the surface to ensure good contact. They are fixedly connected to the busbar using 8 M10 screws, as shown in Figures 2 and 4, to ensure good contact. The secondary winding terminals 1S1, 1S2, 2S1, and 2S2 are located at the bottom of the product and are nickel plated on the surface. The grounding of the product is achieved through the four mounting holes at the bottom or the mounting base plate at the bottom of the product.

Figure 5 Installation hole size diagram without installation base plate

Figure 6 Installation hole size diagram with installation base plate
5.2 Use
Before use, the polarity of the secondary winding wiring should be checked to ensure that 1S1, 2S1, and P1 have the same polarity. When the primary current flows into the transformer from P1 and flows out from P2, the secondary current flows out from 1S1 and 2S1, passes through the secondary load, and then flows back to the transformer from 1S2 and 2S2. When there is current in the primary winding during operation, the secondary winding must not be open circuited, otherwise dangerous high voltage may be generated between the terminals of the secondary winding