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Partial models of harmonic eliminators:
LXQ/RXQ/NLS/QNC high-voltage harmonic eliminator LXQ-6,LXQ-10， LXQ-20, LXQ-35, LXQ3-6, LXQ3-10, LXQ3-35 High voltage harmonic eliminators for neutral points of voltage transformers; LXQII-6, LXQII-10, LXQII-35, LXQIII-6, LXQIII-10, LXQIII-35 are harmonic elimination resistors for the neutral point of voltage transformers; LXQII(D)-6，LXQII(D)-10，LXQII(D)-35，LXQIII(D)-6，LXQIII(D)-10，LXQIII(D)-35，LXQ2(D)-6，LXQ2(D)-10，LXQ2(D)-35，LXQ3(D)-6，LXQ3(D)-10，LXQ3(D)-3 Weak insulation type high-voltage harmonic eliminator; LXQ (3) type 6-10KV universal voltage
Neutral point harmonic eliminator for transformers
Product Introduction:
LXQ(3) Nonlinear Resistance Harmonic Reduction Damper for Neutral Point of 6-35kV Voltage Transformers (abbreviated asHarmonic eliminator）It is installed on the primary winding Y of a 6-35kV voltage transformer (hereinafter referred to as a transformer or PT). A nonlinear resistance harmonic damping device between the neutral point of the junction line and the ground. The product model of the harmonic eliminator - LXQ represents a rectangular harmonic eliminator designed according to traditional shapes;LXQ3A cylindrical harmonic eliminator designed for the third modification, with exposed resistor surfaces and no need for insulation jacket protection. The only difference between the two is their appearance, but their electrical performance is completely the same.
LXQ(3) The DC electrical characteristics of the 6-35kV harmonic eliminator and the traditional RXQ andLXQ harmonic eliminatorSimilar, but the structural design has been greatly improved from the perspective of increasing the heat capacity of the harmonic eliminator. The harmonic eliminator uses SiC with excellent electrical performance and ultrafine particles as the substrate; Pressed into high-density, round cake shaped bodies by a large tonnage press; Under the restored atmosphere; Made by high-temperature sintering at thousands of degrees. The exposed surface structure of the resistor has been specially treated to withstand sunlight and rain, and can be directly used indoors and outdoors. It has a small volume, light weight, fast heat dissipation, high strength, and is easy to install
Favored by users.
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LXQ-2Type harmonic elimination refers to using 6KV and 10KV as universal models with performance parameters (Table 1)
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LXQ(3) Type 6-35KVHarmonic eliminatorMain Performance Parameters (Table 2)
The parameters in the table are typical product parameters of our factory. If the user has different requirements, our factory can produce according to the user's requirements. Harmonic eliminatorModel selection：
LXQ (3) type 635KV harmonic eliminatorUsage environment 1. Outdoor, installed near the transformer, although the harmonic eliminator has a rainproof function, it should not be directly exposed to sunlight and rain; 2. The ambient temperature ranges from -40 ℃ to+60 ℃; 3. The frequency of the AC power system is 50HZ or 60HZ; 4. Areas with seismic intensity below 8 degrees.
LXQ(3) Type 6-35kVHarmonic eliminatorinstall 1. Installation method: The LXQ (3) type harmonic eliminator has a small volume and can be installed vertically or horizontally; It can be directly fixed on the screw of the pressure transformer body (note that the fixing bolts of JDZJ-6-10 pressure transformers are not grounded) The grounding terminal of the harmonic eliminator is connected to the grounding bolt. Also fixed on the bracket near the pressure change. 2. Wiring diagram (see Figure 1) (1) When there are three single-phase voltage transformers (PT): Before connecting the harmonic eliminator, the tails (X • Y • Z) of the three single-phase voltage transformer high-voltage windings are directly grounded or connected in parallel to the neutral point (0) The ground. When connecting the harmonic eliminator, the high-voltage winding tail or (0) directly grounded must be disconnected from the ground. The harmonic eliminator is connected to the neutral point (0) and Between the ground, (the neutral point is no longer directly grounded).
2) When the three-phase five column voltage transformer (PT) is used:
Before connecting the harmonic eliminator, the neutral point "0" of the three-phase five column voltage transformer should be directly grounded. When connecting the harmonic eliminator, the neutral point (0) must be connected to the ground The ground is disconnected, and the harmonic eliminator is connected between the neutral point (0) and the ground (the neutral point is no longer directly grounded). 3. Main installation dimensions of harmonic eliminator: (See Figure 2 for LXQ3 type and Figure 3 for LXQ type)
4. LXQ (3) typeHarmonic eliminatorParameter testing On site measurement can use a 1000V megohmmeter to measure the insulation resistance of the harmonic eliminator, which is generally about 0.5M Ω, and can be installed If measurement is required, eliminate The volt ampere characteristics and nonlinear coefficient α of the harmonic generator can be measured using the following method. (1) Wiring diagram for measuring DC volt ampere characteristics: (see Figure 4)
2) Testing the Nonlinear Coefficient α Method:
When the DC characteristic of the harmonic eliminator is set to 15mA, measure the voltage U at both ends of the harmonic eliminator at 50mA DC and 50mA respectively1、 U2； When the DC characteristics of the harmonic eliminator are 42mA or 50mA, the voltage U at both ends is measured for DC 100mA and 10mA, respectively1、 U2 The rigid nonlinear coefficient α is: U1=I1Voltage at 50 (100) mA; U2=I2Voltage at 5 (10) mA；
I1=50(100)mA,I2=At 5 (10) mA
The mouth coefficient of the harmonic generator should comply with the values specified in Table 1. (3) Thermal capacity spot check test: (see Figure 5)
Require the harmonic clipper to withstand a 250mA power frequency current for 10 minutes without any burning or bursting phenomenon; In the process of eliminating harmonics If the device is still in a high temperature condition, immediately spray water on the harmonic eliminator, and the harmonic eliminator body should be kept intact; Waiting for harmonic eliminator cooling After complete drying, its DC voltage change rate and DC nonlinear coefficientThe alpha change rate is not greater than 10%.
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