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Paşvergara Pêşkêşkirina û Çareseriyekîna Transformatoran Berdewamên

1 Çareseriyekîna Tirandina Mişra

Transformatoran berdewamên bi mişra pêşniyare hatineke têk tirandin. Bajarên herêmî yên tirandina mişra yeketîn ku amûrên bajarên dewletan, cihanên serastan ên porcelen, şerikê mişra, pêşniyar, şerikê mişra, û metal expander.

Rêzikên çareseriyekînên tirandina mişra: Ji bo tirandina mişra ên bajarên dewletan, heta ku çinê zêdetir ya qutayê veyê tevger kirin. Ji bo tirandina mişra ên cihanên serastan ên porcelen, heta ku washerên serastana werdigirin, washerên serastana nû bikin, û ji bo serastanê sealant bidin. Heta ku tirandina mişra li ser nihaşê wanê da washera, wek destûrên washera, an wanê digerîn, washerên nû bikin û re-assemble bikin.

Heta ku tirandina mişra li ser nihaşê flange serastanê nebeşê rêzên, an objektên xerîdar dabeşî, serastanê çareseribike. Heta ku weld ên sheet ên metal expander vekirin an deformed bibe, lê biguherîne bi metal expander nû. Heta ku sand holes transformatoran mişra alûminiyê derbas bike, hammer û punch bikar bînin wê ji bo plugging sand holes.

Ji bo tirandina mişra ên welds ên welded parts, wek şerikê mişra, pêşniyar, û şerikê mişra, heta ku tirandina mişra naqîç nebe, leak-blocking glue bikar bînin ji bo treatment temporary; heta ku tirandina mişra serî be, live-oil welding repair bikin. Lekin, pas welding repair, sample transformer oil bikin ji bo transformer oil chromatographic analysis. Heta ku gases zaravî bikin, transformer oil degassing treatment têne heyî. Heta ku were ku mişra transformatoran vegerîne ji bo repair, transport current transformer back to the maintenance workshop ji bo repair work. Transformer oil nebeşê contaminated, û gorput transformatoran berdewam nebeşê damp.

2 Vegerîna Mişra Transformatoran

Heta ku kaliteya mişra insulating ên transformatoran berdewamên nebeşê û li ser performanceya insulation ên transformatoran bixebit, hemî mişra insulating vegerîne, û mişra nû ji bo treated û qualified re-injected bikin ji bo process ên vegerîna mişra.

3 Çareseriyekîna Water Content Zêdetir ên SF₆ Gas-Insulated Current Transformers

Ji bo SF₆ gas-insulated current transformers di dema operasyonê de, heta ku water content ên SF₆ gas exceed standard, dewater SF₆ gas. Bikar bînin ji SF₆ gas recovery and treatment device ji bo recover SF₆ gas, û pas treat it to be qualified, re-fill it into the current transformer. Let it stand for 1 day and then re-measure the water content in the SF₆ gas. Heta ku still unqualified, check the treatment process and recover and treat again until it is qualified.

4 Other Common Faults of Current Transformers

Heta ku dielectric loss factor ên transformatoran berdewamên increase, increase the number of dielectric loss factor measurement tests, closely monitor the development and change of the dielectric loss factor, and conduct a transformer oil chromatographic analysis test. When acetylene is found to be generated, quickly find out the cause or take the current transformer out of service.

Heta ku content ên single hydrogen ên transformer oil chromatographic analysis ên current transformer exceed standard, closely monitor its growth trend. If multiple measurements are carried out and the measurement results are relatively stable, a fault may not necessarily occur, and degassing treatment can be carried out. If the content of single hydrogen grows rapidly, it should be taken seriously.

5 Paşvergara Pêşkêşkirina

Corresponding fault prevention measures can be formulated according to the common faults of current transformers:

For U-shaped structure capacitive current transformers, to ensure the correct operation of the bus differential protection, the secondary winding for bus differential protection should be set on the side close to the bus. This avoids the misoperation of the bus differential protection and the expansion of the accident impact range when the main insulation breakdown accident occurs at the bottom of the U-shape.

When the grid capacity increases and the system short-circuit current increases, re-check whether the dynamic and thermal stable current values of the current transformers in operation can still meet the requirements. If they cannot meet the requirements, replace the current transformers with those whose dynamic and thermal stable currents meet the requirements in a timely manner.

Regularly or irregularly carry out live-line monitoring work such as infrared temperature measurement. Detect the hidden dangers of current transformers in advance before accidents occur, classify and handle them according to the monitoring data, and try to avoid accidents.