LXQ Series Harmonic Eliminator
Product Overview
The harmonic-suppression resistor (hereinafter referred to as the “harmonic suppressor”) for the neutral point of LXQ, LXQIII, and LXQ(D)III type 6–35 kV voltage transformers is a nonlinear damping resistor installed between the neutral point of the primary winding of the Y0-connected transformer and ground, serving to damp oscillations and limit current. The resistive element of the harmonic suppressor is made of SiC as the base material, while the connecting parts are die-cast aluminum. The overall design is aesthetically pleasing, with a compact footprint, light weight, high mechanical strength, excellent heat dissipation, and easy installation. Having been in service in power grids for many years, practical experience has demonstrated that this harmonic suppressor effectively eliminates ferroresonance in voltage transformers and prevents single-phase high-voltage fuse blowout. It also features good compatibility with weak insulation at the transformer neutral point and a compact, easy-to-install configuration. Products designated with the “(D)” suffix are typically paired with semi-insulated or fully insulated voltage transformers, whereas other models can only be used with fully insulated transformers.
Implementation Standard
JB/T8459
Technical Specifications
Main electrical parameters of resistors: The main electrical parameters of the resistor body are listed in Table 1. Since resistors are made of nonlinear materials, accurate characterization of the resistance value requires measurement with a peak meter.
Project |
LXQ Type III-6 |
Model LXQ III-10 |
LXQ Type III-35 |
|
Through communication |
Voltage (V) peak / √2 |
480~600 |
800~1000 |
2100~2625 |
Resistance (kΩ) |
>48 |
>80 |
>210 |
|
Through communication |
Voltage (V) peak / √2 |
170~210 |
280~350 |
840~1050 |
Resistance (kΩ) |
>170 |
>280 |
>840 |
|
Variation of power-frequency voltage across the terminals of a resistor with type (D) |
At 3 kV (peak/√2), |
The resistance value decreases at 3 kV (peak/√2). |
The resistance value decreases at 5 kV (peak/√2). |
|
Power (W) tolerated for 2 hours |
>800 |
>800 |
>800 |
|
Thermal capacity for passing a 500 mA (RMS) current for 10 minutes |
① No obvious damage |
|||
If the X terminal of the primary winding of the voltage transformer is internally connected to the core and the enclosure, with no insulated lead wire for the X terminal, then when installing a harmonic eliminator on such a transformer, insulation treatment must be applied to the enclosure and the mounting bolts. The procedure is as follows: install an insulating plate at least 5 mm thick between the metal enclosure of the voltage transformer and the grounded metal frame; the metal bolts used for fastening must be fitted with insulating sleeves and insulating washers, or secured using screws made of insulating material, thereby transforming the originally directly grounded enclosure into one with a specified insulation strength. The now-insulated enclosure may be paralleled to form a neutral point, which is then grounded through a harmonic-eliminating resistor. The insulation strength of the transformed insulated enclosure shall not be lower than that of the secondary winding leads, and a harmonic-eliminating resistor model designated with (D) must be selected.
Outline Dimension Drawing (mm)
The external dimensions of the ultra-compact 6 kV and 10 kV resistors are shown in the figure below; for the standard models, the heights for 6 kV, 10 kV, and 35 kV are all 147 mm, with all other dimensions remaining identical.
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