Research Paper for Electrical Engineering
Investigation of Wireless Measure and Control
Methodology for High Voltage Circuit Breaker
I. INTRODUCTION
The high voltage circuit breaker is the most important device for protection and control in power systems and its safety operation has always been an important requirement to be guaranteed. The working state of high voltage circuit breaker can be evaluating by the condition monitoring and fault diagnosis technology. If the data provided by the condition monitoring proved to be normal, the equipment does not need the periodical maintenances, so that the cost can be reduced without any influences on the equipment performance and reliability. The operation department of power system applies condition monitoring technology to develop a periodical maintenance method into a condition-based maintenance method. The successful application of the condition monitoring and fault diagnosis technology can prolong the maintenance period, extend the service life and enhance the operation reliability of the high voltage circuit breaker. The input and output signals in the condition monitoring and control system of high voltage circuit breaker include digital and analog signals, which all run at a complicated low current and voltage system. Traditionally, the wired mode was used for signal transmission, such as the shielded cable and optical fiber, to reduce the harmful interference of the EM environment in substations. However, the costs of laying and maintenance of the wired lines, especially the receive and transmit devices, are extraordinary high. Besides, the transmission lines would take up too much space when there are many parameters need to be monitored, and it will be very inconvenient for maintenances. In addition, when encountering the lightning stroke or strong electromagnetic interference, the transmission lines always turn to be the EMI paths. As a result, the low voltage equipment at the line end may be destroyed by the instantaneous impact so that the
Methodology for High Voltage Circuit Breaker
I. INTRODUCTION
The high voltage circuit breaker is the most important device for protection and control in power systems and its safety operation has always been an important requirement to be guaranteed. The working state of high voltage circuit breaker can be evaluating by the condition monitoring and fault diagnosis technology. If the data provided by the condition monitoring proved to be normal, the equipment does not need the periodical maintenances, so that the cost can be reduced without any influences on the equipment performance and reliability. The operation department of power system applies condition monitoring technology to develop a periodical maintenance method into a condition-based maintenance method. The successful application of the condition monitoring and fault diagnosis technology can prolong the maintenance period, extend the service life and enhance the operation reliability of the high voltage circuit breaker. The input and output signals in the condition monitoring and control system of high voltage circuit breaker include digital and analog signals, which all run at a complicated low current and voltage system. Traditionally, the wired mode was used for signal transmission, such as the shielded cable and optical fiber, to reduce the harmful interference of the EM environment in substations. However, the costs of laying and maintenance of the wired lines, especially the receive and transmit devices, are extraordinary high. Besides, the transmission lines would take up too much space when there are many parameters need to be monitored, and it will be very inconvenient for maintenances. In addition, when encountering the lightning stroke or strong electromagnetic interference, the transmission lines always turn to be the EMI paths. As a result, the low voltage equipment at the line end may be destroyed by the instantaneous impact so that the
References: Review, No.3, 1998, pp. 19-26 4 Temperatures and Breaker Condition in MV Substations. ABB Review, No.3, 1993, pp press, 2007