Touchscreen Pressure Tester

Isolation switches are high-voltage switchgear with high usage and a wide range of applications in the power system. Due to the outdoor isolation switches beingPlease provide the Chinese content that needs to be translated into American English..Electrical equipment that is fully exposed to the atmospheric environment and directly affected by environmental and climatic conditions operates under harsh conditions, prone to mechanical or electrical failures. Particularly, the contact parts are susceptible to damage from rain, dust, and harmful gases, leading to poor contact and overheating. The springs providing contact pressure may soften and lose tension due to overheating, exacerbating the heat and creating a vicious cycle that can eventually burn out the contacts and cause accidents. During maintenance, attention is often focused on replacing visibly failed or broken springs, but those with reduced pressure are often overlooked. This results in uneven distribution of contact current during subsequent operation, with greater differences leading to more uneven distribution. Over time, poor contact and overheating occur. The overheating of the contacts can lead to a domino effect, with poor contact in one contact spreading to the entire contact point. Additionally, many isolation switches have adjustable contact pressure. If the pressure is not adjusted adequately during maintenance or if there are differences in the adjustment pressure for each contact, the aforementioned issues can arise.

Currently, the vast majority of maintenance personnel judge the quality of contact in the conductive parts by measuring their circuit resistance, believing that if the circuit resistance is within the acceptable range, the maintenance work on the conductive parts can be completed successfully. However, this is not the case. The circuit resistance values provided in the product manual refer to the entire conductive circuit, including the bulk resistance and contact resistance of parts such as terminal blocks, conductive tubes, and contact tips, which have a wide range and ample margin. They cannot directly reflect the changes in contact resistance but only indicate the conductivity of the circuit. Tests have shown that the circuit resistance values for both two and four sets of contact tips are within the acceptable range. Similarly, the pressure applied to the contact tips and the small circuit resistance values do not change significantly.

Regulations for measuring contact finger pressure are present in various maintenance procedures and standards, with the recommended tool being a spring scale. In practice, measuring contact finger pressure at height using a spring scale is not only inconvenient and inaccurate but also unsafe. For some structures, such as scissor-type isolators, the contact finger pressure cannot be measured with a spring scale at all. Therefore, the requirement for measuring contact finger pressure is merely a piece of paper.

In response to the current maintenance status of the power supply system, our company has independently developed an intelligent testing device for measuring the contact pressure of high-voltage disconnecting switch contacts. By simply opening the sensor of the testing clamp to simulate the contact at each contact position, the device can display and remember the contact pressure at that moment. This effectively solves a major challenge in measuring contact pressure.

The instrument can also be used by switchgear manufacturers for testing the contact finger pressure; altering the shape of the pressure sensor can also measure the contact finger pressure of circuit breakers.

Isolation switches are high-voltage switchgear widely used in power systems due to their high volume of use and broad application range. As outdoor isolation switches are the only electrical equipment that is completely exposed to the atmosphere and directly affected by environmental and climatic conditions, their operating conditions are quite harsh, making them prone to mechanical or electrical failures. Particularly, the contact parts are susceptible to rain, dust, and harmful gases, leading to poor contact and subsequent overheating. The springs providing contact pressure may soften and lose tension due to overheating, creating a vicious cycle that eventually burns out the contacts and causes accidents. During maintenance, attention is often only given to replacing visibly failed or broken springs, while those with reduced pressure are not assessed or replaced. This leads to uneven distribution of contact current during subsequent operation, with greater differences resulting in more uneven current distribution. Over time, poor contact and overheating occur. The overheating of the contacts can lead to a恶性 cycle, where poor contact in one contact can spread to the entire contact point, causing further poor contact. Moreover, many isolation switches have adjustable contact pressure. If the pressure is not adjusted properly during maintenance or if there are differences in the adjustment pressure for each contact, the aforementioned issues can still arise.

Currently, the vast majority of maintenance personnel judge the quality of contact in the conductive parts by measuring their circuit resistance, believing that if the circuit resistance is within the acceptable range, the maintenance work on the conductive parts can be completed successfully. However, this is not the case. The circuit resistance values provided in the product manual are for the entire conductive circuit, including the bulk resistance and contact resistance of parts such as terminal blocks, conductive tubes, and contact tips, which have a wide range and ample margin. They cannot directly reflect the changes in contact resistance but only indicate the integrity of the conductive circuit. Tests show that the circuit resistance values for both two and four pairs of contact tips are within the acceptable range. Similarly, the pressure exerted on the contact tips does not significantly affect the circuit resistance values.

Regulations for measuring contact pressure of measuring fingers are present in various maintenance procedures and standards, with the recommended tool being a spring scale. In practical operations, measuring the pressure of measuring fingers at high altitudes with a spring scale is not only inconvenient and inaccurate but also unsafe. For some structural isolation switches, the contact pressure of the measuring fingers cannot be measured with a spring scale at all (e.g., scissor-type). Therefore, the requirement to measure the contact pressure of measuring fingers is merely on paper.

In response to the current maintenance status of the power supply system, our company has independently developed an intelligent testing device for measuring the contact pressure of high-voltage isolator contacts. By simply opening the sensor of the test clamp to simulate the contact, it can display and memorize the contact pressure at that moment. This effectively resolves a major challenge in measuring contact pressure.

The instrument can also be used by switchgear manufacturers for testing the pressure on contact fingers; altering the shape of the pressure sensor can also measure the contact finger pressure of circuit breakers.