TWM555581U - High resistance malfunction automatic detection device and detection module - Google Patents

Abstract

A high-impedance fault automatic detecting device comprises: at least one detecting module, comprising a high-frequency current sensing unit, configured to sense a driving power transmitted by a power line to generate a digital sensing signal, and a feeding line The terminal unit determines whether the power line has a high-impedance fault according to the digital sensing signal, and when the determination result is yes, generates and temporarily stores a fault flag; and a feeder information terminal unit reads the feeder terminal unit to judge The result is that the feeder terminal unit receives the fault flag and outputs the fault flag; and a monitoring main station is electrically connected to the feeder information terminal unit to receive the fault flag, and displays the fault flag according to the fault flag. Corresponding to the fault information and the location information for monitoring.

Description

High-impedance fault detection device and detection module

The present invention relates to a device and a module, and more particularly to a high-impedance fault automatic detecting device and a detecting module.

When an existing overhead power distribution system experiences a high-impedance fault (ie, a branch line in a high-voltage overhead power distribution system (eg, a covered wire or bare copper wire) breaks down on a high-impedance ground and a ground fault occurs), it may cause a fault to pass through the fault zone. The current of the branch line is low, so that the current overcurrent or ground overcurrent is too small due to the current in the fault zone (less than the pick up value of the overcurrent or ground overcurrent). The tripping action is performed to isolate the fault interval, causing the power company to passively inform the overhead power distribution system of a high-impedance fault by actively informing the power user that the power line has been disconnected due to power failure or when the disconnected line touches the public and an accident occurs due to a power disturbance. . That is to say, the existing overhead power distribution system cannot detect the fault at the first time when the high-impedance fault occurs on the branch line and further determine the location where the fault occurs, so that the tester cannot immediately know the interval where the high-impedance fault occurs and send it. People go to repair.

Accordingly, it is an object of the present invention to provide a high impedance fault automatic detection device that overcomes the shortcomings of the prior art.

Therefore, the novel high-impedance fault automatic detecting device is applicable to an overhead power distribution system including at least one branch line device, and the at least one branch line device has a power line for receiving and transmitting a driving power, and the high-impedance fault is automatically The detecting device comprises at least one detecting module, a feeder information end unit and a monitoring main station.

The at least one detection module includes a high frequency current sensing unit and a feeder terminal unit.

The high frequency current sensing unit is configured to sense the driving power transmitted by the power line to generate a digital sensing signal, and the current magnitude of the digital sensing signal is a current change following the driving power.

The feeder terminal unit is electrically connected to the high-frequency current sensing unit to receive the digital sensing signal, and determines whether the power line has a high-impedance fault according to the digital sensing signal, and when the determination result is yes, generates and temporarily stores a The fault flag has a fault information for indicating a high impedance fault and a position information for indicating a corresponding position of the high frequency current sensing unit.

The feeder information end unit is electrically connected to the feeder terminal unit in the at least one detection module and reads the feeder terminal unit to receive the fault flag from the feeder terminal unit whose determination result is yes, and the fault flag is Standard output.

The monitoring main station is electrically connected to the feeder information terminal unit to receive the fault flag, and displays the fault information corresponding to the fault flag and the location information for monitoring.

Therefore, another object of the present invention is to provide a detection module capable of overcoming the disadvantages of the prior art.

Therefore, the detection module of the present invention is applicable to an overhead power distribution system including at least one branch line device, wherein the at least one branch line device has a power line for receiving and transmitting a driving power, and the detecting module includes a high frequency. A current sensing unit and a feeder terminal unit.

The high frequency current sensing unit is configured to sense the driving power transmitted by the power line to generate a digital sensing signal, and the current magnitude of the digital sensing signal is a current change following the driving power.

The feeder terminal unit is electrically connected to the high-frequency current sensing unit to receive the digital sensing signal, and determines whether the power line has a high-impedance fault according to the digital sensing signal, and when the determination result is yes, generates and temporarily stores a The fault flag has a fault information for indicating a high impedance fault and a position information for indicating a corresponding position of the high frequency current sensing unit.

The utility model has the following advantages: the feeder terminal unit determines whether a high-impedance fault occurs according to the digital sensing signal, and generates the fault flag when the determination result is yes, so that the monitoring main station displays correspondingly according to the fault flag. The fault information and the location information corresponding thereto are used for monitoring, so that the detecting personnel can immediately know the interval in which the high impedance fault occurs and send the person to repair from the monitoring main station.

Referring to Figures 1 and 2, an embodiment of the present novel high impedance fault detection apparatus is applicable to an overhead power distribution system (not shown) including at least one branch line device 1. The at least one branch line device 1 has a power line 11 for receiving and transmitting a driving power to the plurality of loads 10, and a plurality of switches 12 spaced apart from each other on the power line 11. The high-impedance fault automatic detecting device comprises two detecting modules 2, a Feeder Remote Terminal Unit (FRTU) 3 and a monitoring main station 4. In this embodiment, the high-impedance fault automatic detecting device includes two detecting modules 2, but is not limited thereto. In other embodiments, the high-impedance fault detection device may include only one detection module, or the number of the detection modules may be two or more.

The detection modules 2 are spaced apart from each other, and each detection module 2 is disposed adjacent to a corresponding one of the switches 12. Each detection module 2 includes a high frequency current sensing unit 5 and a feeder terminal unit (FTU) 6.

In each of the detection modules 2, the high-frequency current sensing unit 5 is configured to sense the corresponding driving power transmitted by the power line 11 to generate a digital sensing signal Ds. The magnitude of the current of the digital sense signal Ds is a change in current following the drive power. In the embodiment, the high-frequency current sensing unit 5 can still operate normally when the power line 11 has a high-impedance fault, and the phenomenon of magnetic saturation does not occur, and the high-frequency current sensing unit 5 includes a current comparator. 51 and an analog to digital converter 52.

The current comparator 51 is configured to sense the corresponding driving power transmitted by the power line 11 to generate an analog sensing signal. The magnitude of the current of the analog signal is a change in current following the drive power.

The analog-to-digital converter 52 is electrically coupled to the current comparator 51 to receive the analog sense signal and convert the analog sense signal into the digital sense signal Ds.

In each of the detection modules 2, the feeder terminal unit 6 is electrically connected to the analog digital converter 52 of the high frequency current sensing unit 5 to receive the digital sensing signal Ds, and is determined according to the digital sensing signal Ds. Whether the high-impedance fault occurs in the power line 11 and when the judgment result is YES, a fault flag F _flag is generated and temporarily stored. The fault flag F _flag has a fault information for indicating a high impedance fault and a position information for indicating a corresponding position of the high frequency current sensing unit 5. It should be noted that, when the feeder terminal unit 6 determines that a high impedance fault has occurred and the fault flag F _{flag is} generated, the feeder terminal unit 6 has to reset itself.

In the present embodiment, the feeder terminal unit 6 includes a high impedance fault determiner 61, a storage 62 and a converter 63.

The high-impedance fault determiner 61 is electrically connected to the analog-to-digital converter 52 to receive the digital sensing signal Ds, and determines whether the power line 11 has a high-impedance fault according to the digital sensing signal Ds, and when the determination result is yes, A fault signal Fs is generated.

The converter 63 is electrically connected between the high-impedance fault determiner 61 and the memory 62, receives the fault signal Fs from the high-impedance fault determiner 61, and converts the fault signal Fs into the fault flag F. _Flag and the fault flag F _{flag is} temporarily stored in the storage 62.

In detail, in each of the feeder terminal units 6, the high-impedance fault judging method performed by the high-impedance fault determiner 61 includes the following steps:

Step 71: The current in the digital sensing signal Ds is sampled by the high impedance fault determiner 61 from 0th to 10th second to generate a sampling signal.

Step 72: Perform a wavelet transform on the sampled signal by using the high impedance fault determiner 61 to obtain a plurality of wavelet coefficients.

Step 73: Normalize and normalize the wavelet coefficients by using the high impedance fault determiner 61 to obtain first to third high frequency wavelet coefficients and a low frequency coefficient.

Step 74: The high impedance fault determiner 61 uses a neural network algorithm to generate an output value according to the first to third high frequency wavelet coefficients and the low frequency coefficient.

Step 75: The high-impedance fault determiner 61 determines whether the power line 11 has a high-impedance fault based on the output value. If yes, proceed to step 76; if no, proceed to step 77.

It should be noted that when the output value is at a high level (ie, a logic 〝1〞 level), the high-impedance fault determiner 61 determines that the power line 11 has a high-impedance fault when the output value is at a low level ( That is, when the logic 〝0〞 level), the high-impedance fault determiner 61 determines that the power line 11 does not have a high-impedance fault.

Step 76: The fault signal Fs is generated by the high impedance fault determiner 61.

Step 77: The time of sampling the current in the digital sensing signal Ds is adjusted to be adjacent to the next 10 seconds by the high-impedance fault determiner 61, and jumps back to step 71 to perform the subsequent steps again. At this time, in step 71, the high-impedance fault determiner 61 samples the next 10 seconds of the current in the digital sensing signal Ds to generate another sampling signal.

For example, if the first step 71 is to sample the current from 0th to 10th, then after step 77 and when the step 71 is performed for the second time, it will be adjusted to the 11th to 20th second. Current sampling, if the current sampling of the 11th to 20th second is performed in the first step 71, after step 77 and the second step 71, the adjustment is made to the 21st to 30th second. Current sampling, and so on. Therefore, the high-impedance fault determiner 61 may generate a plurality of the fault signals Fs according to the high-impedance fault judging method, so that the converter 63 receives the plurality of fault signals Fs and converts the plurality of fault signals Fs into multiple The fault flag F _{flag is used} , and a plurality of the fault flag F _{flag are} temporarily stored in the corresponding storage 62.

The feeder information end unit 3 is electrically connected to the storage unit 62 of the feeder terminal unit 6 in each detection module 2 and reads the storage unit 62 to store the storage terminal unit 6 from the determination result. The controller 62 receives the fault flag F _flag (or a plurality of the fault flag F _flag ) and outputs the fault flag F _flag (or a plurality of the fault flag F _flag ).

It should be noted that, in this embodiment, the feeder information end unit 3 reads the fault flag F _flag stored in each storage 62 every 2 seconds, but is not limited thereto. After the feeder information end unit 3 confirms that the fault flag F _flag stored in each storage 62 has been retrieved, each feeder terminal unit 6 will store the corresponding fault flag stored in the storage 62. F _{flag is} cleared.

The monitoring main station 4 is electrically connected to the feeder information end unit 3 to receive the fault flag F _flag , and displays the corresponding fault information and the position information according to the fault flag F _flag for the monitoring personnel to monitor. In this way, the inspector can quickly know the location of the high-impedance fault of the power line 11, and immediately perform Fault Detection Isolation and Restoration (FDIR). It should be noted that the fault information and the location information corresponding to the fault flag F _flag can be displayed in a known manner in a known manner, and thus will not be described herein.

In summary, the digital sensing unit D generates the digital sensing signal Ds, and the feeder terminal unit 6 determines whether a high-impedance fault occurs according to the digital sensing signal, and the determination result is When the fault flag F _{flag is} generated, the feeder information end unit 3 actively reads the fault flag F _flag and outputs the fault flag F _flag to the monitoring main station 4, so that the monitoring main station 4 is based on The fault flag F _flag displays the corresponding fault information and the position information for the monitoring personnel to monitor, and the detecting personnel can immediately know the interval where the high impedance fault occurs and send the person to repair, so that the high impedance fault of the embodiment The time required for the automatic detection device to complete the re-power is reduced. In addition, since the fault flag F _flag is transmitted by the existing feeder information terminal unit 3, the high-impedance fault automatic detecting device of the embodiment does not need to additionally install a transmission network to transmit the fault flag F. _Flag can reduce the cost and complexity of circuit fabrication.

However, the above is only the embodiment of the present invention, and when it is not possible to limit the scope of the present invention, all the simple equivalent changes and modifications according to the scope of the patent application and the contents of the patent specification are still This new patent covers the scope.

1‧‧‧Difference line device
10‧‧‧ load
11‧‧‧Power line
12‧‧‧ switch
2‧‧‧Detection module
3‧‧‧ feeder information terminal unit
4‧‧‧Monitor main station
5‧‧‧High frequency current sensing unit
51‧‧‧ Current comparator
52‧‧‧ Analog Digital Converter
6‧‧‧ feeder terminal unit
61‧‧‧High impedance fault determiner
62‧‧‧Storage
63‧‧‧ converter
71~77‧‧‧Steps
Ds‧‧‧ digital sensing signal
F _flag ‧‧‧Fault flag
Fs‧‧‧ fault signal

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a circuit block diagram illustrating an embodiment of the novel high-impedance fault detection device; and FIG. It is a flowchart illustrating a method in which each high impedance fault determiner of the embodiment performs a high impedance fault judgment.

1‧‧‧Difference line device

10‧‧‧ load

11‧‧‧Power line

12‧‧‧ switch

2‧‧‧Detection module

3‧‧‧ feeder information terminal unit

4‧‧‧Monitor main station

5‧‧‧High frequency current sensing unit

51‧‧‧ Current comparator

52‧‧‧ Analog Digital Converter

6‧‧‧ feeder terminal unit

61‧‧‧High impedance fault determiner

62‧‧‧Storage

63‧‧‧ converter

Ds‧‧‧ digital sensing signal

F _flag ‧‧‧Fault flag

Fs‧‧‧ fault signal

Claims (8)

A high-impedance fault automatic detecting device is applicable to an overhead power distribution system including at least one branch line device, the at least one branch line device having a power line for receiving and transmitting a driving power, the high-impedance fault automatic detecting device The method includes: at least one detection module, including a high frequency current sensing unit, configured to sense the driving power transmitted by the power line to generate a digital sensing signal, wherein a current magnitude of the digital sensing signal follows the a current change of the driving power, and a feeder terminal unit electrically connected to the high-frequency current sensing unit to receive the digital sensing signal, and determining whether the power line has a high-impedance fault according to the digital sensing signal, and the determination result is When yes, a fault flag is generated and temporarily stored, the fault flag has a fault information for indicating a high impedance fault and a position information indicating a corresponding position of the high frequency current sensing unit; The information terminal unit is electrically connected to the feeder terminal unit in the at least one detection module and reads the feeder terminal unit to obtain a judgment result If yes, the feeder terminal unit receives the fault flag and outputs the fault flag; and a monitoring main station is electrically connected to the feeder information terminal unit to receive the fault flag, and correspondingly according to the fault flag display The fault information and the location information for monitoring. The high-impedance fault detecting device of claim 1, wherein the high-frequency current sensing unit comprises: a current comparator for sensing the driving power transmitted by the power line to generate an analog sensing a signal, the current magnitude of the analog signal is a current change following the driving power; and an analog-to-digital converter electrically connecting the current comparator to receive the analog sensing signal and converting the analog sensing signal into the signal Digital sensing signal. The high impedance fault automatic detecting device of claim 2, wherein the feeder terminal unit comprises: a high impedance fault determiner electrically connected to the analog digital converter to receive the digital sensing signal, and according to the digital sense The test signal determines whether the power line has a high impedance fault, and when the judgment result is yes, generates a fault signal; a memory; and a converter electrically connected between the high impedance fault determiner and the memory, and receives The fault signal from the high impedance fault determiner converts the fault signal into the fault flag and temporarily stores the fault flag in the memory. The high-impedance fault automatic detecting device according to claim 3, wherein the high-impedance fault determiner first samples the digital sensing signal to generate a sampling signal, and then performs a wavelet transform on the sampling signal to obtain a plurality of wavelet coefficients, and normalizing and normalizing the wavelet coefficients to obtain first to third high frequency wavelet coefficients and a low frequency coefficient, and according to the first to third high frequency wavelet coefficients and the low frequency The coefficient utilizes a neural network algorithm to generate an output value. When the output value is at a high level, the power line generates a high impedance fault, and the high impedance fault determiner generates the fault signal. A detection module is applicable to an overhead power distribution system including at least one branch line device, wherein the at least one branch line device has a power line for receiving and transmitting a driving power, and the detecting module comprises: a high frequency current a sensing unit, configured to sense the driving power transmitted by the power line to generate a digital sensing signal, the current magnitude of the digital sensing signal is a current change following the driving power; and a feeder terminal unit, the electrical connection The high-frequency current sensing unit receives the digital sensing signal, and determines whether the power line has a high-impedance fault according to the digital sensing signal, and when the determination result is yes, generates and temporarily stores a fault flag, the fault The flag has a fault information for indicating a high impedance fault and a position information for indicating a corresponding position of the high frequency current sensing unit. The detection module of claim 5, wherein the high frequency current sensing unit comprises: a current comparator for sensing the driving power transmitted by the power line to generate an analog sensing signal, The magnitude of the current of the analog sensing signal is a current change following the driving power; and an analog-to-digital converter electrically connecting the current comparator to receive the analog sensing signal and converting the analog sensing signal into the digital sensing signal. The detecting module of claim 5, wherein the feeder terminal unit comprises: a high impedance fault determiner electrically connected to the high frequency current sensing unit to receive the digital sensing signal, and sensing according to the digital position The signal determines whether the power line has a high impedance fault, and when the determination result is yes, generates a fault signal; a memory; and a converter electrically connected between the high impedance fault determiner and the memory, the receiving is from The fault signal of the high impedance fault determiner converts the fault signal into the fault flag and temporarily stores the fault flag in the memory. The detection module of claim 7, wherein the high-impedance fault determiner first samples the digital sensing signal to generate a sampling signal, and then performs a wavelet transform on the sampling signal to obtain a plurality of wavelets. Coefficients, normalizing and normalizing the wavelet coefficients to obtain first to third high frequency wavelet coefficients and a low frequency coefficient, and utilizing the first to third high frequency wavelet coefficients and the low frequency coefficients The neural network algorithm generates an output value, and when the output value is at a high level, the power line generates a high impedance fault, and the high impedance fault determiner generates the fault signal.