详情描述


LXQ(D)II Type Single Synchronous Condenser

6In an electromagnetic voltage transformer (hereinafter referred to as PT) within a neutral point ungrounded power grid of ~35kV, when the busbars are unloaded or have fewer outgoing lines, over-saturation of the voltage transformer may occur due to reasons such as energizing during closing or fault grounding elimination during operation. This may lead to ferromagnetic resonance overvoltage. Abnormal phenomena such as unstable relative ground voltage, false operation of grounding indicators, and melting of PT high-voltage fuses may occur. In severe cases, this can cause the PT to burn out, leading to other accidents.

LXQ(D)IIType of surge resistor, installed in the primary winding Y of 6～35kV PT0High-capacity nonlinear resistor between the neutral point of the wiring and ground, serving as a damping and current-limiting device. This harmonic resistor fully complies with the provisions of Article 4.1.5 of the current power department standard DL/T 620—1997 "Overvoltage Protection and Insulation Coordination of AC Electrical Installations," effectively limiting the ferrite resonance of voltage transformers.

If the neutral point of a 6～35kV power grid is not grounded, the busbar is Y0The primary winding of the connected potential transformer (PT) will become the metallic ground path for the power grid. When there is a single-phase grounding or failure, the power grid's capacitance to ground undergoes a charging and discharging transition process through the primary winding of the PT. Tests have shown that at this time, there is often a half-wave surge current with an amplitude of several amperes passing through the PT, which may cause the PT's high-voltage fuse (0.5A) to melt. And the installedLXQIIFollowing the series harmonic filters, this surge will be effectively suppressed, and the high-voltage fuses will no longer blow due to this surge (Note: Electronic harmonic filters installed on the PT secondary side generally cannot eliminate this surge).

LXQIINon-inductive reactors are without porcelain sleeves. The nonlinear resistive bodies are made from SiC, sintered at high temperatures, and are connected using aluminum. They feature a compact size, large capacity, and high mechanical strength.

2  Product Features

Our newly introduced LXQII series harmonic filters serve as replacements for the LXQ models, utilizing high-capacity single nonlinear components andCopperMaterials are used for manufacturing. Below are some descriptions of improvements made to the LXQII series harmonic suppressors compared to the original LXQ type harmonic suppressors:

①  LXQTypeThe harmonic filter is made of aluminum material.LXQIIFull copper material usedThe product is manufactured with high electrical and thermal performance. LXQII is even better.Utilizing a single large current nonlinear resistor chip, the uneven current flow phenomenon in the original multi-chip parallel resonator is eliminated, resulting in enhanced stability in performance.

②  LXQThe type of harmonic filter has a current carrying capacity of only500mAAnd the PT high-voltage fuse is generally 0.5A, which may cause the suppressor to burn out before the PT during high current flow, and when it breaks, it may lead to the PT neutral point not being grounded and other accidents.Due toProduced with superior materials and craftsmanship, LXQIISeries harmonic filters have a high current-carrying capacity.1000mAMore than double the original size.

③  LXQIf an inverter-type harmonic suppressor experiences an overcurrent, the resultant high voltage is directly applied to the neutral point of the PT, which could potentially damage the neutral point insulation of the PT with weak insulation. LXQIISeries Harmonic FiltersChoke with D-type component for weak insulation PTs, which effectively limits the voltage at both ends of the choke to protect the neutral point insulation.

④  LXQIITypeThe harmonic filter dimensions are further reduced based on the LXQ series, with a height of 110mm for the 10kV model, particularly suitable for installation in PT cabinets and handcart cabinets. The entire harmonic filter is directly connected using metal materials, without porcelain sleeves, eliminating the risk of explosion.

⑤   The original LXQ series harmonic filters use DC parameters, which are not conducive to user measurement, whereas the LXQIITypeDirectly uses the communication parameters to characterize the filter parameters, directly reflecting the actual operating conditions for easy retesting by the user.