Intelligent outdoor pole-mounted circuit breaker with traveling wave fault positioning function

Abstract

The utility model relates to an intelligent outdoor pole-mounted circuit breaker with a traveling wave fault positioning function, which comprises a circuit breaker body and a feeder terminal unit (FTU), the circuit breaker body comprises a casing, a digital signal conversion module is arranged in the casing, the digital signal conversion module is in signal connection with the feeder terminal unit (FTU), a solid-sealed polar pole is arranged on the casing, and the digital signal conversion module is in signal connection with the feeder terminal unit (FTU). The embedded pole is internally provided with a traveling wave fault zero-sequence current sampling mutual inductor, and the traveling wave fault zero-sequence current sampling mutual inductor is used for acquiring a traveling wave fault signal; the traveling wave fault zero-sequence current sampling mutual inductor is connected with the digital signal conversion module, so that a measured traveling wave fault signal is converted into a digital signal to be transmitted to the feeder terminal FTU, the feeder terminal FTU is provided with a wireless communication module, and the feeder terminal FTU is in communication connection with a remote background through the wireless communication module; according to the utility model, fault points can be accurately positioned, faults can be rapidly isolated, maintenance personnel can be guided to find the fault points, fault maintenance and inspection work can be reduced, and operation and maintenance cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of outdoor circuit breakers, in particular to an intelligent outdoor pole-mounted circuit breaker with a traveling wave fault locating function. Background Art

[0002] With the continuous development of the power system, the use scope of power cables in transmission lines has gradually increased, and the length has become longer and longer. Once a transmission line fails, it will not only affect the production efficiency of the enterprise, but also seriously affect the normal life of residents. Therefore, it is particularly important to find the fault point of the transmission line in time and find the cause of the fault. At present, faults such as line break, aging of power supply equipment, two-phase grounding, single-phase grounding, two-phase short circuit, and three-phase short circuit occur frequently in transmission lines. Since the 1980s, fault distance measurement research has become a hot topic of research at home and abroad. The original troubleshooting method is relatively backward, mostly manual line patrol, which takes a long time. Summary of the invention

[0003] The purpose of the utility model is to solve the problems existing in the above-mentioned prior art and to provide an intelligent outdoor pole-mounted circuit breaker with a traveling wave fault locating function.

[0004] The specific scheme of the utility model is: an intelligent outdoor pole-mounted circuit breaker with a traveling wave fault locating function, comprising a circuit breaker body and a feeder terminal FTU, the feeder terminal FTU and the circuit breaker body are connected as a whole, the circuit breaker body comprises a casing, a digital signal conversion module is installed in the casing, a signal connection is established between the digital signal conversion module and the feeder terminal FTU, a sealed pole is installed on the casing, a traveling wave fault zero-sequence current sampling transformer is installed in the sealed pole, the traveling wave fault zero-sequence current sampling transformer is used to collect and obtain a traveling wave fault signal; the traveling wave fault zero-sequence current sampling transformer is connected to the digital signal conversion module, so as to convert the measured traveling wave fault signal into a digital signal and transmit it to the feeder terminal FTU, the feeder terminal FTU is provided with a wireless communication module, and the feeder terminal FTU is connected to a remote background communication through the wireless communication module.

[0005] Furthermore, the traveling wave fault zero-sequence current sampling transformer is installed at the outgoing terminal.

[0006] Furthermore, a zero-sequence current and phase current integrated transformer is also installed at the inner end of the output terminal, and the zero-sequence current and phase current integrated transformer is connected to the digital signal conversion module.

[0007] Furthermore, a phase voltage sensor is installed in the sealed pole, and the phase voltage sensor is connected to the digital signal conversion module.

[0008] Furthermore, the feeder terminal FTU is provided with a GPS positioning module or a Beidou positioning module, and the feeder terminal FIU matched with the circuit breakers at both ends of the fault point adopts the GPS module or the Beidou module to maintain clock synchronization.

[0009] Compared with the prior art, the utility model has the following advantages: by detecting the initial wave head of the fault traveling wave and combining the propagation speed and time difference of the traveling wave in the transmission line, the location of the fault point can be accurately determined, which helps maintenance personnel to quickly find the fault point and repair it, reduce unnecessary inspections and maintenance work, reduce operation and maintenance costs, and improve the economic benefits of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0011] Figure 2 yes Figure 1 The main view;

[0012] Figure 3 It is a schematic diagram of the solid-sealed pole of the utility model;

[0013] Figure 4 yes Figure 3 AA view;

[0014] Figure 5 This is a schematic diagram of the fault point location of the utility model;

[0015] In the figure: 1. Casing; 2. Sealed pole; 21. Phase voltage sensor; 22. Zero-sequence current and phase current integrated transformer; 23. Traveling wave fault zero-sequence current sampling transformer; 3. Digital signal conversion module. DETAILED DESCRIPTION

[0016] See also Figure 1-4 The present embodiment is an intelligent outdoor pole-mounted circuit breaker with a traveling wave fault locating function, comprising a circuit breaker body and a feeder terminal FTU, the feeder terminal FTU being connected to the circuit breaker body as a whole, the circuit breaker body comprising a casing 1, a digital signal conversion module 3 being mounted in the casing 1, a signal connection between the digital signal conversion module 3 and the feeder terminal FTU, a sealed pole 2 being mounted on the casing 1, a traveling wave fault zero-sequence current sampling transformer 23 being mounted in the sealed pole 2, the traveling wave fault zero-sequence current sampling transformer 23 being used to collect and obtain a traveling wave fault signal; the traveling wave fault zero-sequence current sampling transformer 23 is connected to the digital signal conversion module 3, thereby converting the measured traveling wave fault signal into a digital signal and transmitting it to the feeder terminal FTU, the feeder terminal FTU being provided with a wireless communication module, the feeder terminal FTU being connected to a remote background communication via the wireless communication module.

[0017] Furthermore, the traveling wave fault zero-sequence current sampling transformer 23 is installed at the outgoing terminal.

[0018] Furthermore, the inner end of the outlet terminal is also equipped with a zero-sequence current and phase current integrated transformer 22, and the zero-sequence current and phase current integrated transformer 22 is connected to the digital signal conversion module 3; the zero-sequence current and phase current integrated transformer 22 is used to monitor the zero-sequence current and phase current of the line. When a zero-sequence current or phase current fails, it is fed back to the corresponding feeder terminal FTU, and the feeder terminal FTU analyzes the received digital signal and automatically controls its circuit breaking.

[0019] Furthermore, the sealed pole 2 is equipped with a phase voltage sensor 21, which is connected to the digital signal conversion module 3; the phase voltage sensor 21 is used to monitor the phase voltage of the line. When a phase voltage fault occurs, it is fed back to the corresponding feeder terminal FTU, and the feeder terminal FTU analyzes the received digital signal and automatically controls its circuit breaking.

[0020] Furthermore, the feeder terminal FTU is provided with a GPS positioning module or a Beidou positioning module, through which the positions of each circuit breaker are centralized to a remote background, thereby realizing accurate positioning of each circuit breaker. Figure 5 , indicating that the outgoing line fault at point F in a section of the line causes the power transmission of the line to be interrupted. Points M and N are the two circuit breakers closest to point F. The two circuit breakers at points M and N are the above-mentioned intelligent outdoor pole-mounted circuit breakers with traveling wave fault location function. Its working principle is as follows: When point F is interrupted due to a fault, it will send traveling waves to points M and N. The time it takes for the traveling wave at point F to be transmitted to point M is t M The time it takes for the traveling wave from point F to reach point N is t N , the distance from point F to point M is d M , the distance from F to N is d N , the speed of the traveling wave is known to be v, and the distance between points M and N is L. Based on these known conditions, we can calculate

[0021] ; In this way, the position of the fault point F can be accurately located.

[0022] The unified clock source function of the GPS positioning module or Beidou positioning module at point M and point N basically eliminates the above time t M and t N error, thereby improving positioning accuracy.

[0023] At the first moment of a line fault, the circuit breakers at points M and N, which are closest to the two ends of the fault point F, detect the fault through the traveling wave fault zero-sequence current sampling transformer 23, and feed it back to the corresponding feeder terminal FTU, which analyzes the received digital signal, automatically controls the circuit breaker, and isolates the fault point F.

Claims

1. An intelligent outdoor pole-mounted circuit breaker with a traveling wave fault location function comprises a circuit breaker body and a feeder terminal FTU, wherein the feeder terminal FTU is connected to the circuit breaker body as a whole, and is characterized by: The circuit breaker body includes a casing, a digital signal conversion module is installed in the casing, and a signal connection is formed between the digital signal conversion module and the feeder terminal FTU. A sealed pole is installed on the casing, and a traveling wave fault zero-sequence current sampling transformer is installed in the sealed pole. The traveling wave fault zero-sequence current sampling transformer is used to collect and obtain a traveling wave fault signal; the traveling wave fault zero-sequence current sampling transformer is connected to the digital signal conversion module, so as to convert the measured traveling wave fault signal into a digital signal and transmit it to the feeder terminal FTU. The feeder terminal FTU is provided with a wireless communication module, and the feeder terminal FTU is connected to a remote background communication through the wireless communication module.

2. The intelligent outdoor pole-mounted circuit breaker with traveling wave fault location function according to claim 1 is characterized in that: The traveling wave fault zero-sequence current sampling transformer is installed at the outgoing terminal.

3. The intelligent outdoor pole-mounted circuit breaker with traveling wave fault location function according to claim 2 is characterized in that: The inner end of the outlet terminal is also provided with a zero-sequence current and phase current integrated transformer, and the zero-sequence current and phase current integrated transformer is connected to the digital signal conversion module.

4. The intelligent outdoor pole-mounted circuit breaker with traveling wave fault location function according to claim 1 is characterized in that: The sealed pole is provided with a phase voltage sensor, which is connected to the digital signal conversion module.

5. The intelligent outdoor pole-mounted circuit breaker with traveling wave fault location function according to any one of claims 1 to 4, characterized in that: The feeder terminal FTU is provided with a GPS positioning module or a Beidou positioning module.

6. The intelligent outdoor pole-mounted circuit breaker with traveling wave fault location function according to claim 5 is characterized in that: The fault point is accurately located through the unified time source function of the GPS positioning module or the Beidou positioning module.

7. The intelligent outdoor pole-mounted circuit breaker with traveling wave fault location function according to claim 6 is characterized in that: The feeder terminal FTU automatically disconnects the circuit breakers at both ends of the fault point, thereby isolating the fault point.

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