According to the requirements of the "pre-regulation," the following tests must be conducted on circuit breaker capacitors.
1. **Insulation Resistance Measurement Between Poles**
This test is performed using a 2500V megohmmeter, and the insulation resistance should generally not be less than 5000MΩ. The test is carried out every 1.3 years or during major overhauls of the circuit breaker. It ensures that the insulation between the poles remains in good condition, preventing any potential short circuits or electrical failures.
2. **Capacitance Value Measurement**
The capacitance value is measured using the QS1 type Schering bridge with a positive wiring method. The deviation from the rated value should not exceed ±5%. This test is also conducted every 1-3 years or during maintenance. Accurate capacitance values are essential for the proper functioning of the capacitor and the overall performance of the circuit breaker.
3. **tanδ Measurement (Dielectric Loss Factor)**
This test is also done using the QS1 type Schering bridge with a positive connection. At 10kV, the tanδ value should not exceed 0.005 for oil-paper insulation and 0.0025 for film-paper composite insulation. The measurement helps assess the dielectric loss, which can indicate aging or degradation of the insulation material. This test is performed every 1-3 years or during overhauls.
4. **Leakage Oil Inspection**
A visual inspection is conducted to check for any signs of oil leakage. This is important because oil leakage can lead to reduced insulation properties and potential safety hazards. The inspection is part of the routine maintenance process and is usually done during overhauls.
These tests are crucial for ensuring the reliability and safety of circuit breaker capacitors. Regular testing helps identify early signs of wear or damage, allowing for timely maintenance and preventing unexpected failures. By following these procedures, operators can maintain the performance and longevity of the equipment.
Porcelain Fuse Cutout
Dropout Fuse Cutout and load drop fuse cutout are outdoor used high-voltage protective devices. They are connected with the main lines of the distribution transformer or the distribution wires to protect the transformer or wires from short circuit and overload, and on/off loading current. Dropout fuse cutout consists of insulating bracket and fuse tube. The static contacts are fixed on the two ends of bracket, while the moving contacts are fixed on the two ends of fuse tube. Fuse tube is composed of inner extinction tube and the outer epoxy glass tube. The load drop fuse cutout is added with elastic supporting contacts and arcing shield for switching on-off loading current. In normal operation, the fuse tube will form an enclosure via its tightened fuse link. The fuse will be melt off quickly and form an arc if there is any fault, the extinction tube is heated by the arc, exploding much gas to give high pressure into the tube and blow along with the tube, so the arc is quickly elongated and extinguished. When the fuse is cut off, moving contacts at the bottom turn down without tension; the locking frame will release the fuse, so the fuse drops to form obvious break. When it needs to put load on, start the contact with insulating cod, then the static and moving contacts are still keeping in touch, keep pulling the contacts till the supporting contacts apart. Then there is the arc among the supporting contacts, which is prolonged in the narrow space of arcing shield.At the same time, the arc extinguishing cover generates gas, and the arc is extinguished when the current exceeds zero.
Porcelain Fuse Cutout,Drop Fuse Cutout,Fuse Link Cut Out,Cutout Fuse Holder
Jilin Nengxing Electrical Equipment Co. Ltd. , https://www.nengxingelectric.com