Synchronous time service line fault detection system
Through the line fault detection system with synchronous timing, intelligent current transformers and noise detection devices are used to achieve accurate fault identification of distribution lines, solving the misjudgment and delay problems of fault identification in complex power systems, and improving the power system operational efficiency and safety.
Patent Information
- Application Number
- CN202420689959.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-07
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-04-07
AI Technical Summary
In modern power systems, the difficulty in identifying distribution line faults is difficult due to equipment complexity and transformer fault performance similar to line faults, resulting in increased difficulty in misjudgment and identification. In particular, the delay in the fault signal transmission on the back of the transformer makes it difficult to accurately identify them. .
The line fault detection system with synchronous timing is adopted, including intelligent current transformers, synchronous timing devices, noise detection devices, line monitors and remote monitoring servers. Through wireless communication and Beidou synchronous timing, the time synchronization of each device is achieved, and the current signal is collected in real time and the Noise data is transmitted to a remote monitoring server using LoRa and 4G wireless communication modules for analysis.
It realizes accurate fault identification of distribution lines, reduces misjudgment and misjudgment, improves the operating efficiency and safety of the power system, and helps operation and maintenance personnel to quickly and accurately narrow the fault range.
Smart Images
Figure CN222299768U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power distribution line detection, in particular to a synchronous timing line fault detection system. Background Art
[0002] In the complex network of modern power systems, fault identification of distribution lines is a crucial task. However, due to the complexity of equipment structure and the limitations of grid intelligence, it is still a technical challenge to accurately distinguish line, transformer and back-end faults.
[0003] Distribution lines are usually composed of multiple components, including conductors, insulators, transformers, etc. When a fault occurs, multiple components may be involved, making it difficult to determine the source of the fault. The complexity of distribution lines is an important factor in the difficulty of fault identification. As an important part of the distribution system, when a transformer fails, its performance may be similar to a line fault, leading to misjudgment. In addition, distribution line faults behind the transformer may also be difficult to accurately identify due to the delay in signal transmission. Utility Model Content
[0004] To solve the above-mentioned problems, the utility model provides a line fault detection system with synchronous timing, comprising a plurality of intelligent current transformers, a synchronous timing device, a line monitor, a noise detection device, a switch and a remote monitoring server, wherein the synchronous timing device is wirelessly connected to the plurality of intelligent current transformers, the line monitor and the noise detection device respectively, the line monitor is wirelessly connected to the plurality of intelligent current transformers respectively, the switch is connected to the line monitor and the noise detection device respectively through a data transmission line, and the switch is connected to the remote monitoring server through a network cable; the noise detection device comprises a noise acquisition sensor, a bandpass filter module, an analog-to-digital conversion module and a microprocessor, the noise acquisition sensor is electrically connected to the analog-to-digital conversion module via the bandpass filter module, and the analog-to-digital conversion module is electrically connected to the microprocessor.
[0005] In order to realize the current signal collection of the distribution line, the intelligent current transformer includes a current transformer, a current counter and a wireless communication module, and the wireless communication module includes a LoRa wireless communication module and a 4G wireless communication module.
[0006] As a specific implementation, the intelligent current transformer can be connected in series to a transformer 10Kv transmission line.
[0007] The intelligent current transformer can be connected in series with the transformer low-voltage transmission line.
[0008] The synchronous timing device adopts the Beidou synchronous timing device.
[0009] The line monitor is a distribution transformer monitoring terminal, and the distribution transformer monitoring terminal is electrically connected to the transformer.
[0010] The noise collection sensor adopts a voiceprint pickup with a measurement accuracy of ±0.5dB and a frequency range of 20HZ to 12.5KHZ. The noise detection device is arranged on the side of the transformer oil tank.
[0011] The beneficial effects are as follows: the utility model is a synchronous timing line fault detection system. By setting up an intelligent current transformer, the current signal in the line can be collected in real time; by setting up a synchronous timing device, it can ensure that each intelligent current transformer and line monitor collects electric energy parameters at the same time, thereby avoiding misjudgment and missed judgment due to time asynchronization. At the same time, by setting up a noise detection device, the noise condition of the transformer during operation can be monitored in real time, abnormal conditions of the transformer can be discovered in time, and operation and maintenance personnel can be assisted to reduce the scope of distribution line faults and improve the operation efficiency and safety of the power system. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a schematic diagram of the structure of the line fault detection system for synchronous timing. DETAILED DESCRIPTION
[0013] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.
[0014] This embodiment provides a synchronous timing line fault detection system. Figure 1 , including multiple intelligent current transformers, synchronous timing devices, line monitors, noise detection devices, switches and remote monitoring servers. The synchronous timing devices are connected to multiple intelligent current transformers, line monitors and noise detection devices respectively through wireless communication, and the line monitors are connected to multiple intelligent current transformers respectively through LoRa wireless communication. The synchronous timing devices can receive satellite signals to calculate time information, and synchronize the time information to each intelligent current transformer, line monitor and noise detection device, so as to achieve the accuracy of signal acquisition of each intelligent current transformer, line monitor and noise detection device at the same time. The line monitor is connected to the switch via RS485 communication, and the switch is interconnected with the remote monitoring server network. The line monitor can transmit the current acquisition signal of the intelligent current transformer to the remote monitoring server after the switch signal conversion, so that the operation and maintenance personnel can monitor and analyze the operation data of the distribution line on the remote monitoring server. At the same time, the noise detection device is connected to the switch via a data transmission line, and can collect the sound signal of the distribution line transformer, and transmit the sound signal to the remote monitoring server via the switch. The operation and maintenance personnel can confirm whether the transformer is faulty based on the sound signal of the transformer, thereby realizing rapid and accurate identification of the fault.
[0015] In order to realize the current signal collection of the distribution line, the intelligent current transformer includes a current transformer, a current counter and a wireless communication module, the wireless communication module includes a LoRa wireless communication module and a 4G wireless communication module, and the 4G wireless communication module can receive the time synchronization signal of the synchronous timing device. The current transformer is connected in series to the distribution line, and can sense and detect the current flowing through the primary winding of the current transformer, sample the current signal through the current counter, and transmit the collected current signal to the line monitor through the LoRa wireless communication module.
[0016] In a specific implementation, the line monitor can be a distribution transformer monitoring terminal, which is also electrically connected to the transformer and can monitor the operation data of the transformer in real time. The intelligent current transformer is connected in series to the transformer 10Kv transmission line and the transformer low-voltage transmission line respectively, and the current detection is performed on the high-voltage side and the low-voltage side distribution lines. The synchronous timing device adopts the Beidou synchronous timing device, which can synchronize the line monitor and the intelligent current transformer, so that the system can measure and collect the electric energy parameters of the high-voltage side of the distribution line, the low-voltage side of the distribution line and the transformer at the same time. The line monitor will upload the measured and collected electric energy parameters to the remote monitoring server after conversion by the switch. The operation and maintenance personnel can analyze the current acquisition signals of each measurement node through the remote monitoring server, and judge the fault location of the distribution line according to the current value and transformer ratio of the 10Kv transmission line and the low-voltage transmission line. For example, if the current value on the 10Kv transmission line side increases and the current value of the low-voltage transmission line decreases abnormally, it is determined to be a transformer or low-voltage transmission line fault.
[0017] In order to further help the operation and maintenance personnel to reduce the scope of the fault, the line fault detection system is provided with a noise detection device to collect the noise data of the transformer in real time during operation. The noise detection device includes a noise collection sensor, a bandpass filter module, an analog-to-digital conversion module and a microprocessor. The noise collection sensor is electrically connected to the analog-to-digital conversion module via the bandpass filter module, and the analog-to-digital conversion module is electrically connected to the microprocessor. The noise collection sensor adopts a voiceprint pickup with a measurement accuracy of ±0.5dB and a frequency range of 20HZ to 12.5KHZ. By setting the noise detection device on the side of the transformer oil tank, the noise of the transformer is collected by the noise collection sensor, and the noise is filtered and screened by the bandpass filter module, and the sound signal is digitally converted by the analog-to-digital conversion module. The microprocessor can detect the frequency of the collected noise sound signal, and the noise detection device uploads the detection signal to the remote monitoring server through the interactive machine. The operation and maintenance personnel determine whether it is a transformer fault or a low-voltage transmission line fault according to the sound signal frequency value detected by the noise detection device, thereby reducing the scope of the fault.
Claims
1. A synchronous timing line fault detection system, characterized in that: It includes multiple intelligent current transformers, synchronous timing devices, line monitors, noise detection devices, switches and remote monitoring servers. The synchronous timing devices are respectively connected to the multiple intelligent current transformers, line monitors and noise detection devices by wireless communication. The line monitors are respectively connected to the multiple intelligent current transformers by wireless communication. The switches are respectively connected to the line monitors and noise detection devices by data transmission lines. The switches are connected to the remote monitoring server by network cables. The noise detection device comprises a noise acquisition sensor, a bandpass filter module, an analog-to-digital conversion module and a microprocessor. The noise acquisition sensor is electrically connected to the analog-to-digital conversion module via the bandpass filter module, and the analog-to-digital conversion module is electrically connected to the microprocessor.
2. The line fault detection system according to claim 1, characterized in that: The intelligent current transformer includes a current transformer, a current counter and a wireless communication module, and the wireless communication module includes a LoRa wireless communication module and a 4G wireless communication module.
3. The line fault detection system according to claim 2, characterized in that: The intelligent current transformer can be connected in series with the transformer 10Kv transmission line.
4. The line fault detection system according to claim 2, characterized in that: The intelligent current transformer can be connected in series with the transformer low-voltage transmission line.
5. The line fault detection system according to claim 1, characterized in that: The synchronous timing device adopts the Beidou synchronous timing device.
6. The line fault detection system according to claim 1, characterized in that: The line monitor is a distribution transformer monitoring terminal, and the distribution transformer monitoring terminal is electrically connected to the transformer.
7. The line fault detection system according to claim 1, characterized in that: The noise collection sensor adopts a voiceprint pickup with a measurement accuracy of ±0.5dB and a frequency range of 20HZ to 12.5KHZ.
8. The line fault detection system according to claim 1, characterized in that: The noise detection device is arranged on the side of the transformer oil tank.