LXQ series harmonic elimination resistorDetailed product description：

1、 Overall Introduction
The LXQ type 6-35 kV voltage transformer neutral point damping device (referred to as L-type damping device) is a nonlinear damping device installed between the neutral point of the primary winding YO of the 6-35 kV voltage transformer (referred to as voltage transformer or P.T) and the ground. LXQ type refers to the use of damping devices for pressure neutral points protected by exposed intangible ceramic sleeves.  
The DC characteristics of LXQ type harmonic eliminator are similar to those of traditional RXQ type harmonic eliminator, but the structural design is quite different. It uses high-density SiC as the base material and is composed of multiple nonlinear harmonic damping elements that are fired at over a thousand degrees Celsius and connected in series. Small size, light weight, high strength, fast heat dissipation, easy to install, no need for external ceramic sleeve protection. The exposed surface structure has undergone special treatment and can withstand exposure to sunlight, rain, and extreme cold and heat. It can be directly used outdoors and is very popular among users.  

2、 Electrical application functions
1. Used to eliminate or dampen electromagnetic resonance overvoltage caused by voltage saturation, which can lead to unstable phase voltage in the system.
2. Used to limit the inrush current generated in the primary winding circuit of the transformer when the single-phase grounding of the system disappears, which can damage the transformer or cause the fuse of the transformer to melt.  
3. Used to prevent voltage damage for a long time after a single-phase grounding occurs in the system.  

3、 Main functional parameters of LXQ series harmonic elimination resistor:

model	DC characteristics	nonlinear coefficient	Heat capacity 250mA (10min)	Dimensions: Length * Width * Height (mm)	Weight (kg)
LXQ-6-10 (connected between the neutral point of the primary coil of the 6-10KV voltage transformer and the ground)	1.45-1.65/15	0.40-0.45	through	50*50*260	one point six
LXQ-35 type (connected between the neutral point of the 35KV voltage transformer primary coil and the ground, with a neutral point insulation strength greater than 5KV)	4.0-4.2/42	0.4-0.45	through	50*50*375	two point four
LXQ-35 type (connected between the neutral point of the 35KV voltage transformer primary coil and the ground, with a neutral point insulation strength of less than 5KV)	>=2.8/50	0.3-0.4	through	50*50*260	one point six

4、 Usage environment
1. Environmental temperature: -40 ℃~+40 ℃;
2. Frequency: 50HZ or 60HZ;
3. Areas with seismic intensity below 8 degrees.  
5、 Installation instructions
The LXQ type harmonic eliminator has a small body but high mechanical strength, and can be installed vertically or horizontally; It can be directly fixed on the bolts of the transformer body or on the bracket near the transformer. Taking the smallest space handcart cabinet as an example; The X end of the JDJJ2-35 transformer primary coil in the JYN1-35 transformer cabinet is located on the fuse side, and a hole (φ 12) can be drilled on the side of the fuse bracket to fix the LXQ-35 (B) type harmonic eliminator on the side of the bracket. The harmonic eliminator is installed horizontally.  
6、 Friendly reminder
If the neutral point of the power grid where the 6-35kV substation is located is not grounded, the electromagnetic transformer primary winding connected by YO on its busbar becomes the only metal channel for the neutral ungrounded power grid to ground. Therefore, the charging and discharging path of the power grid relative to the ground capacitor must pass through the transformer primary winding. This slow process saturates the transformer core deeply. Therefore, when the power grid grounding disappears, a surge of several amperes will appear in the transformer primary winding, melting the transformer 0.5A fuse. If you choose LXQ type resistors, this phenomenon will no longer occur. The LXQ resistor can effectively suppress the inrush current of the primary winding of the transformer, while the electronic harmonic eliminator installed on the secondary side of the transformer cannot limit this inrush current. If a surge occurs, short circuiting the secondary opening triangle will only increase the amplitude of the surge. Therefore, for the voltage transformer that has already installed LXQ type resistors, it is recommended to disable the electronic harmonic eliminator that uses short-circuit method to eliminate harmonics in the three port triangle.
If the neutral point of a 6-35KV substation is not grounded, and the relative ground voltage is unstable when the bus is unloaded or there are few outgoing lines, you can choose LXQ type resistors, which will greatly reduce this phenomenon. The resistance value of LXQ type resistors can effectively suppress ferromagnetic resonance caused by voltage changes. Since the resistor is installed between the neutral point of the voltage transformer and the ground, that is, in the zero sequence circuit of the voltage transformer, it does not affect the voltage measurement and energy measurement connected between the secondary lines of the voltage transformer. It only has a slight impact on the measurement of the relative ground voltage value in the zero sequence circuit of the voltage transformer. This voltage value is used as an observation of the relative ground insulation, and this slight impact is generally acceptable