CN-122017444-A - Feeder terminal and fault detection positioning method

CN122017444ACN 122017444 ACN122017444 ACN 122017444ACN-122017444-A

Abstract

The invention provides a feeder terminal and a fault detection positioning method, wherein the feeder terminal comprises a feeder module, a traveling wave module and a positioning time service module, the feeder module is respectively and electrically connected with the positioning time service module and the traveling wave module and is used for acquiring electric signals on a target electric power line and determining power frequency signals in the electric signals, a target period when the target electric power line breaks down is determined and sent to the traveling wave module based on time service information output by the positioning time service module and according to the power frequency signals, the traveling wave module is electrically connected with the positioning time service module and is used for acquiring the electric signals on the target electric power line and determining traveling wave signals in the electric signals, and a target moment when the fault occurs on the target electric power line is determined based on time service information output by the positioning time service module and according to the traveling wave signals and the target period. The invention realizes preliminary period detection based on the feeder line module and the power frequency signal and further time detection based on the traveling wave module and the traveling wave signal, and can realize high-precision fault detection.

Inventors

TANG FEITING
XU JUN
YANG JIAN
SUN ZENGXIAN
LI XIAOXIAO

Assignees

北京和信瑞通电力技术股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250929

Claims (13)

1. The feeder terminal is characterized by comprising a feeder module, a traveling wave module and a positioning time service module; The feeder line module is respectively and electrically connected with the positioning time service module and the traveling wave module, and is used for acquiring an electric signal on a target power line, determining a power frequency signal in the electric signal, determining a target period when the target power line fails based on time service information output by the positioning time service module and according to the power frequency signal, and sending the target period to the traveling wave module; The traveling wave module is electrically connected with the positioning time service module and is used for acquiring the electrical signal on the target power line and determining a traveling wave signal in the electrical signal, and determining the target moment when a fault occurs on the target power line based on the time service information output by the positioning time service module and according to the traveling wave signal and the target period.
2. The feeder terminal of claim 1, wherein the feeder module comprises a first signal sensor, a first signal conditioning unit, and a first processing unit; the first signal sensor is electrically connected with the signal input end of the first processing unit through the first signal conditioning unit, the time service input end of the first processing unit is electrically connected with the positioning time service module, and the communication end of the first processing unit is electrically connected with the traveling wave module; The first signal sensor is used for acquiring the electric signal on the target power line and outputting the power frequency signal to the first processing unit through the first signal conditioning unit; The first processing unit is used for determining the target period when the target power line fails based on the time service information and according to the power frequency signal, and sending the target period to the traveling wave module.
3. The feeder terminal of claim 2, wherein the traveling wave module comprises a second signal conditioning unit and a second processing unit; The first signal sensor is also electrically connected with the signal input end of the second processing unit through the second signal conditioning unit, the time service input end of the second processing unit is electrically connected with the positioning time service module, and the communication end of the second processing unit is electrically connected with the communication end of the first processing unit; The first signal sensor is used for acquiring the electric signal on the target power line and outputting the traveling wave signal to the second processing unit through the second signal conditioning unit; the second processing unit is used for determining the target moment when the fault occurs on the target power line based on the time service information and according to the traveling wave signal and the target period.
4. The feeder terminal of claim 2, wherein the traveling wave module comprises a second signal sensor, a second signal conditioning unit, and a second processing unit; The second signal sensor is electrically connected with the signal input end of the second processing unit through the second signal conditioning unit, the time service input end of the second processing unit is electrically connected with the positioning time service module, and the communication end of the second processing unit is electrically connected with the communication end of the first processing unit; The second signal sensor is used for acquiring the electrical signal on the target power line and outputting the traveling wave signal to the second processing unit through the second signal conditioning unit; the second processing unit is used for determining the target moment when the fault occurs on the target power line based on the time service information and according to the traveling wave signal and the target period.
5. The feeder terminal of claim 4, wherein the second signal sensor comprises a rogowski coil and an integrating circuit; The Rogowski coil is electrically connected with the input end of the integrating circuit, and the output end of the integrating circuit is electrically connected with the signal input end of the second processing unit through the second signal conditioning unit; The rogowski coil is used for acquiring the electric signal on the target power line and outputting a differential signal to the integrating circuit; the integrating circuit is used for carrying out signal reduction on the differential signal and outputting the traveling wave signal to the second processing unit through the second signal conditioning unit.
6. A feeder terminal as claimed in any of claims 3 to 5, wherein the second signal conditioning unit comprises a bandpass filter circuit and an ADC sampling circuit; The band-pass filter circuit is electrically connected with the signal input end of the second processing unit through the ADC sampling circuit; The band-pass filter circuit is used for carrying out band-pass filtering on the accessed signal to obtain the traveling wave signal and outputting the traveling wave signal to the second processing unit through the ADC sampling circuit.
7. The feeder terminal of claim 6, wherein the band-pass filter circuit has a filter range of 100hz to 2MHz, and/or the ADC sampling circuit has a sampling rate of not less than 4MHz.
8. A fault detection and location method, characterized in that it is applied to the feeder terminal according to any one of claims 1 to 7, and comprises: The feeder line module acquires the electric signals on a target power line, determines the power frequency signals in the electric signals, determines the target period when the target power line fails based on the time service information output by the positioning time service module and according to the power frequency signals, and sends the target period to the traveling wave module; The traveling wave module acquires the electric signals on the target power line and determines the traveling wave signals in the electric signals, and the target moment when the fault occurs on the target power line is determined based on the time service information output by the positioning time service module and according to the traveling wave signals and the target period.
9. The fault detection and location method according to claim 8, wherein the determining the target period when the target power line fails based on the timing information output by the location timing module and according to the power frequency signal includes: determining a target difference value of the power frequency signal in a current period and a previous period based on the time service information and a difference value algorithm; And if the target difference value is larger than a preset difference value, determining the current period as the target period.
10. The fault detection positioning method according to claim 8, wherein the determining the target time when the fault occurs on the target power line based on the timing information output by the positioning timing module and according to the traveling wave signal and the target period includes: Based on the time service information, determining a traveling wave component corresponding to the target period in the traveling wave signal; And determining the maximum value in the traveling wave component, and determining the time corresponding to the maximum value in the traveling wave component as the target time.
11. The fault detection location method of claim 8, further comprising, after the step of determining the target time when the fault occurs on the target power line: the traveling wave module obtains a first wave recording signal positioned before the target moment in the traveling wave signals according to a first time interval, obtains a second wave recording signal positioned after the target moment in the traveling wave signals according to a second time interval, and generates and stores a wave recording file according to the first wave recording signal, the target moment and the second wave recording signal.
12. The fault detection location method of claim 8, further comprising, after the step of determining the target time when the fault occurs on the target power line: the traveling wave module sends the target moment to the feeder line module; And the feeder line module sends the target moment and the positioning information output by the positioning time service module to a processing background, so that the processing background carries out a double-end algorithm according to the positioning information, the target moment and the power line propagation speed to obtain a fault position when the target power line breaks down.
13. The fault detection location method of claim 8, further comprising, after the step of determining the target time when the fault occurs on the target power line: the traveling wave module sends the target moment to the feeder line module; and the feeder line module carries out a double-end algorithm according to the positioning information output by the positioning time service module, the target moment and the power line propagation speed to obtain a fault position when the target power line fails.

Description

Feeder terminal and fault detection positioning method Technical Field The invention relates to the technical field of power line monitoring, in particular to a feeder terminal and a fault detection and positioning method. Background The feeder terminal is an intelligent terminal device installed on a distribution room or feeder. The remote power distribution substation can communicate with a remote power distribution substation, send operation data of power distribution equipment to the power distribution substation, and can also receive control commands of the power distribution substation to control and regulate the power distribution equipment. The feeder terminal has small volume and large quantity, can be arranged on an outdoor feeder, is provided with a transmitter, is directly used for alternating current sampling, is resistant to high temperature and severe cold, and is suitable for outdoor severe environments. With the continuous development of technology, the current feeder terminal has the capability of detecting the power line faults. At present, a feeder terminal is usually used for realizing fault detection based on sampling of power frequency signals, but cannot accurately position and judge the fault position. Disclosure of Invention Aiming at the defects existing in the prior art, the invention provides a feeder terminal and a fault detection and positioning method. In a first aspect, in one embodiment, the present invention provides a feeder terminal comprising a feeder module, a traveling wave module, and a positioning timing module; The feeder line module is respectively and electrically connected with the positioning time service module and the traveling wave module, and is used for acquiring an electric signal on a target power line, determining a power frequency signal in the electric signal, determining a target period when the target power line fails based on time service information output by the positioning time service module and according to the power frequency signal, and sending the target period to the traveling wave module; the traveling wave module is electrically connected with the positioning time service module and is used for acquiring the electric signals on the target power line and determining traveling wave signals in the electric signals, and the target moment when the fault occurs on the target power line is determined based on the time service information output by the positioning time service module and according to the traveling wave signals and the target period. In one embodiment, the feeder module includes a first signal sensor, a first signal conditioning unit, and a first processing unit; The first signal sensor is electrically connected with a signal input end of the first processing unit through the first signal conditioning unit, a time service input end of the first processing unit is electrically connected with the positioning time service module, and a communication end of the first processing unit is electrically connected with the traveling wave module; the first signal sensor is used for acquiring an electric signal on a target power line and outputting a power frequency signal to the first processing unit through the first signal conditioning unit; the first processing unit is used for determining a target period when a target power line fails based on time service information and according to the power frequency signal and sending the target period to the traveling wave module. In one embodiment, the traveling wave module includes a second signal conditioning unit and a second processing unit; The first signal sensor is also electrically connected with the signal input end of the second processing unit through the second signal conditioning unit, the time service input end of the second processing unit is electrically connected with the positioning time service module, and the communication end of the second processing unit is electrically connected with the communication end of the first processing unit; The first signal sensor is used for acquiring an electric signal on a target power line and outputting a traveling wave signal to the second processing unit through the second signal conditioning unit; The second processing unit is used for determining a target moment when a fault occurs on the target power line based on the time service information and according to the traveling wave signal and the target period. In one embodiment, the traveling wave module includes a second signal sensor, a second signal conditioning unit, and a second processing unit; the second signal sensor is electrically connected with the signal input end of the second processing unit through the second signal conditioning unit, the time service input end of the second processing unit is electrically connected with the positioning time service module, and the communication end of the second processing unit is electrically connected with the communication end of the fir