CN106940413A - The short trouble section determination methods and device of high pressure long cable circuit - Google Patents
The short trouble section determination methods and device of high pressure long cable circuit Download PDFInfo
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- G—PHYSICS
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The present invention relates to a kind of short trouble section determination methods of high pressure long cable circuit, for judging that short trouble is betided in cross interconnected section of which cable in high pressure long cable circuit, each cross interconnected section of cable includes some sections of cores and is joined directly together composition threephase cable circuit, the connected cut cable for constituting three sections of sheath connecting paths of metal sheath intersection, and short trouble section determination methods are：Detect the sense of current at three sections of sheath connecting path two ends in cross interconnected section of each cable respectively, if any one section of sheath connecting path two ends in cross interconnected section of a certain cable the sense of current on the contrary, if be short-circuited in cross interconnected section of the cable failure.The present invention judges the failure that whether is short-circuited in cross interconnected section of the cable using the sense of current at cross interconnected section of two ends of cable as criterion, and it can realize on-line monitoring, quickly can find out fault section in time after failure generation.
Description
Technical Field
The invention relates to a method and a device for judging which cable cross-connection section a short-circuit fault occurs in a high-voltage long cable circuit.
Background
The distance protection is widely applied to high-voltage transmission lines, and a protection principle based on parameter identification adopts parameters of system change after a fault to form a protection criterion. The high-voltage long cable line has the characteristics of long transmission distance, large transmission capacity, obvious distribution parameter characteristics, multiple complete cable cross interconnection sections and complex line channel environment, and can obviously influence the action performance of the distance protection algorithm. Since the measured impedance is no longer in direct proportion to the fault distance, the protection range of the traditional distance protection algorithm is reduced. In practical applications, the distance protection using the line impedance also has the situations of inaccurate calculation of the line impedance and incomplete information of the line length.
The traveling wave method is another method widely used for fault location of overhead lines or cable lines. The method carries out fault location by detecting the propagation time of the transient traveling wave on the fault line between the bus and the fault point, and because the propagation speed of the transient traveling wave is close to the light speed, the fault location mode based on the traveling wave method has the problems of noise elimination and wave head moment extraction, and in addition, the wave speed of the long cable line is not uniform and the wave impedance is discontinuous due to a plurality of cross interconnected sections and a complex line channel environment, so that the method is difficult to be applied to the actual long cable line.
Disclosure of Invention
The invention aims to provide a short-circuit fault section judgment method of a high-voltage long cable line, which is suitable for the high-voltage long cable line and can quickly and conveniently judge which cable cross interconnection section the short-circuit fault occurs in.
In order to achieve the purpose, the invention adopts the technical scheme that:
a short-circuit fault section judging method of a high-voltage long cable line is used for judging which cable cross interconnection section a short-circuit fault occurs in the high-voltage long cable line formed by a plurality of cable cross interconnection sections, each cable cross interconnection section comprises a plurality of cable sections, wherein the cable sections are directly connected to form a three-phase cable line, and metal protective layers are connected in a cross mode to form a three-section protective layer connecting path, and the short-circuit fault section judging method comprises the following steps: and respectively detecting the current directions of two ends of the three sheath connecting paths in each cable cross interconnection section, and if the current directions of two ends of any one section of the sheath connecting path in one cable cross interconnection section are opposite, generating a short circuit fault in the cable cross interconnection section.
Preferably, current signals at two ends of the sheath connecting path in three sections of the cable cross interconnection section are collected, and fast fourier transform is performed on the current signals to obtain phase angles of the current signals; and performing phase difference operation on phase angles of current signals at two ends of each section of the protective layer connecting path so as to judge whether the current directions at two ends of each section of the protective layer connecting path are opposite or not.
Preferably, when the difference between the phase angles of the current signals at the two ends of any section of the sheath connecting path is within the allowable range of the phase centered at ± 180 °, it is determined that the current directions at the two ends of the sheath connecting path are opposite.
Preferably, the phase allowable range is (120 °, 240 °) — (240 °, -120 °).
The invention also provides a short-circuit fault section judging device adopting the short-circuit fault section judging method for the high-voltage long cable line, the short-circuit fault section judging device comprises a plurality of current transformers for respectively detecting current signals at two ends of each section of the sheath connecting passage in each cable cross interconnection section and a host connected with each current transformer and used for judging whether short-circuit fault occurs in each cable cross interconnection section, and the host is in remote communication connection with a monitoring center.
Preferably, both ends of each section of the sheath connecting passage are connected with a grounding box, and the current transformer is arranged at the grounding box.
Preferably, the host computer is in remote communication with the monitoring center through an antenna via a GPRS/3G/4G network.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the invention judges whether the short-circuit fault occurs in the cable cross interconnection section by taking the current directions at the two ends of the cable cross interconnection section as the criterion, can realize on-line monitoring, and can quickly and timely find out the fault section after the fault occurs.
Drawings
Fig. 1 is a schematic mechanical diagram of a power system.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings to which the invention is attached.
The first embodiment is as follows: the simple power system shown in fig. 1 is composed of a power source, a transmission line and a load, wherein the transmission line adopts a high-voltage long cable line. The high-voltage long cable line is routed through a plurality of connected cable cross-connection sections, and each cable cross-connection section comprises a plurality of cable sections. In each cable cross-connection section, the cable sections are respectively provided with wire cores which are directly connected to form a three-phase cable circuit, and the metal protective layers are cross-connected to form three sections of protective layer connecting passages. In the specific example shown in fig. 1, the high voltage long cable run comprises three complete cross-connect sections of cable, cross-connect section 1, cross-connect section 2 and cross-connect section 3. And each complete cross-connect section of cable is in turn made up of nine cable sections. Taking cross-connection segment 1 as an example, nine cable segments included therein are a1, a2, A3, B1, B2, B3, C1, C2 and C3, respectively. The nine cable sections are divided into three groups, wherein the cores of A1, A2 and A3 are sequentially and directly connected to form an A-phase cable circuit, the cores of B1, B2 and B3 are sequentially and directly connected to form a B-phase cable circuit, and the cores of C1, C2 and C3 are sequentially and directly connected to form a C-phase cable circuit. The metal protective layers of the cable sections are connected in a cross mode in the following mode: the metal protective layers of A1, B2 and C3 are sequentially connected to form a first-stage protective layer connecting path, the metal protective layers of B1, C2 and A3 are sequentially connected to form a second-stage protective layer connecting path, and the metal protective layers of C1, A2 and B3 are sequentially connected to form a third-stage protective layer connecting path. The metal sheaths of the two cable sections are cross-connected through cross-connection boxes J1 and J2. The structure of the cross-connect segment 2 and the cross-connect segment 3 is similar to that of the cross-connect segment 1, and is not described in detail herein with reference to fig. 1.
The method is characterized in that each cable cross interconnection section is taken as an object, and the following method is adopted for judging which cable cross interconnection section the short circuit fault occurs in the whole high-voltage long cable circuit: and respectively detecting the current directions of two ends of three sections of sheath connecting passages in each cable cross interconnection section, and if the current directions of two ends of any one section of sheath connecting passage in a certain cable cross interconnection section are opposite, generating a short-circuit fault in the cable cross interconnection section.
For the cross interconnection section 1, the total six current signals at the two ends of the three sections of the sheath connecting passages are respectively as follows: i at both ends A1-B2-C31a、I2c(ii) a I at both ends B1-C2-A31b、I2a(ii) a I at both ends C1-A2-B31c、I2b. For the cross interconnection section 2, the total six current signals at the two ends of the three sections of the sheath connecting passages are respectively as follows: i at both ends A4-C5-B63a、I4b(ii) a I at both ends B4-A5-C63b、I4c(ii) a I at both ends C4-B5-A63c、I4a. For the cross interconnection section 3, the total six current signals at the two ends of the three sections of the sheath connecting passages are respectively as follows: i at both ends A7-B8-C95a、I6c(ii) a I at both ends B7-C8-A95b、I6a(ii) a I at both ends C7-A8-B95c、I6b。
In the cable line shown in fig. 1, when a breakdown fault of the cable line occurs in any one section of the cable line, the wire core forms a short circuit with the metal protective layer, the current of the wire core directly flows into the ground from grounding points at two ends through the metal protective layer, the current of the metal protective layer of the cable section with the fault and the cable cross interconnection section where the cable section with the fault is located is increased, and the current of the metal protective layer is close to the fault current. Meanwhile, due to the electromagnetic induction effect, a line close to a fault line can also induce and generate a large current. Based on the method, the fault is positioned according to the change of the sheath current under the fault.
For the long cable circuit shown in fig. 1, the metal sheath of the cable has a limited current amplitude induced by the core, when a fault occurs, the fault current flows into the ground from the fault core to the grounding points at two ends through the metal sheath, the sheath current at the fault section is very large, and the sensors at the two ends monitor that the directions of the sheath currents are opposite; the non-fault section has serious three-phase imbalance caused by large core current (close to the power supply direction) or deficiency (close to the load direction) of a fault phase line, and the sheath current of the non-fault section is also increased. In order to make the fault section criterion more obvious, the invention mainly uses the opposite directions of the sheath currents at the two ends of the fault section (the cable cross-connection section) as the criterion.
Because the cable metal sheath current has a transient process during fault, and the fault current is mainly power frequency current, a power frequency signal of the current needs to be extracted by a Fast Fourier Transform (FFT) method. The method comprises the steps of collecting current signals at two ends of a three-section sheath connecting passage in each cable cross interconnection section, and performing fast Fourier transform on the current signals to obtain phase angles of the current signals. When any point of the wire core in the long cable line has a ground fault, fault current flows into the ground from the grounding points at two ends along the metal protective layers, so that the current directions of the protective layers at two ends are opposite. The phase difference of the current power frequency signals at the two ends is close to 180 degrees, and because the cable line in a complete cross interconnection section is generally not more than 1500m, the phase difference of the current signals at the two ends of the sheath cannot be greatly different due to unequal lengths of fault points and the two ends. Therefore, the phase difference operation is carried out on the phase angle of the current signals at the two ends of the connecting path of each section of the protective layer, so as to judge whether the current directions at the two ends of the connecting path of each section of the protective layer are opposite.
In the invention, B (I) is used for representing the power frequency phase (unit is angle) of a current signal I, P (section) is used for representing the sheath current phase difference of a corresponding cable cross-connection section (section belongs to [ "C1" "" C2 "" "C3" "), wherein" C1 "," C2 "and" C3 "respectively represent a complete cross-connection section 1, a cross-connection section 2 and a cross-connection section 3).
Then the phase difference of the three sheath connecting paths in the cross-connect section 1 is:
P(C1A)＝B(I2c)-B(I1a)
P(C1B)＝B(I2a)-B(I1b)
P(C1C)＝B(I2b)-B(I1c)
for the cross interconnection section 2 and the cross interconnection section 3, the following are provided:
P(C2A)＝B(I4b)-B(I3a)
P(C2B)＝B(I4c)-B(I3b)
P(C2C)＝B(I4a)-B(I3c)
P(C3A)＝B(I6c)-B(I5a)
P(C3B)＝B(I6a)-B(I5b)
P(C3C)＝B(I6b)-B(I5c)
generally, when the phase angle difference of the current signal at the two ends of any section of sheath connecting path is within the phase allowable range with + -180 degrees as the center, the current direction at the two ends of the sheath connecting path is judged to be opposite, because the phase difference of the fault section and the non-fault section under the fault is greatly different, a larger margin can be reserved when the fault section criterion is established, the phase allowable range is (120 degrees, 240 degrees) ∪ (-240 degrees, -120 degrees), namely, the phase angle difference is within the range, the fault is considered to occur, generally, the phase difference of the non-fault section is very small and is within + -30 degrees, therefore, the judgment can be carried out by the method, namely, when the typical long cable line structure shown in figure 1 is in fault, the fault is deemed to have occurred at the first cross-connect segment of cable, the fault is deemed to have occurred at the second cross-connect section of cable,the fault is deemed to have occurred at the third cross-connect section of cable.
The short-circuit fault section judging method is realized by a short-circuit fault section judging device. The short-circuit fault section judging device comprises a plurality of current transformers and a host. Each current transformer is used for respectively detecting current signals at two ends of each section of the sheath connecting passage in each cable cross interconnection section. Usually, both ends of each sheath connecting path are connected to a grounding box (such as G1-G6), and a current transformer is arranged at the grounding box. The host is connected with each current transformer, so that current signals detected by the current transformers are transmitted to the host, and the host judges whether short-circuit faults occur in the cross interconnection sections of the cables or not by adopting the phase method. The host computer also carries out remote communication with the monitoring center through the antenna via a GPRS/3G/4G network, so that the judgment result is remotely uploaded to the monitoring center.
First, each current transformer is installed at the above-mentioned ground box position (G1-G6) to detect I respectively1a、I1b、I1c、I2a、I2b、I2c、I3a、I3b、I3c、I4a、I4b、I4c、I5a、I5b、I5c、I6a、I6b、I6c。
The data acquired by the current transformer in real time are transmitted to a host nearby, the host processes the data acquired by the current transformer in real time, FFT (Fast Fourier transform) is carried out on the acquired signals to obtain the power frequency amplitude and phase angle of the sheath current of each monitoring point, and phase difference operation is carried out on the monitoring points at the two ends of all sections. The processing of the data specifically comprises:
(1) FFT operation:
wherein,is a twiddle factor; x (N) is a finite-length sequence with the length of N, namely an original signal collected by the current transformer; x (k) is a finite long sequence of frequency domain N points.
(2) Calculating the phase difference of monitoring points at two ends of the section:
P(C1A)＝B(I2c)-B(I1a)
P(C1B)＝B(I2a)-B(I1b)
P(C1C)＝B(I2b)-B(I1c)
P(C2A)＝B(I4b)-B(I3a)
P(C2B)＝B(I4c)-B(I3b)
P(C2C)＝B(I4a)-B(I3c)
P(C3A)＝B(I6c)-B(I5a)
P(C3B)＝B(I6a)-B(I5b)
P(C3C)＝B(I6b)-B(I5c)
wherein, B (I) represents the power frequency phase (unit is angle) of the current signal I, P (section) represents the sheath current phase difference of the corresponding cable section (section belongs to [ "C1", "C2", "C3" ], wherein "C1", "C2" and "C3" respectively represent the first, the second and the three complete cross-connection sections).
(3) Faulty zone determination
1)The fault is deemed to have occurred at the first cross-connect segment of cable.
2)The fault is deemed to have occurred at the second cross-connect section of cable.
3)The fault is deemed to have occurred at the third cross-connect section of cable.
After the processing, the host computer carries out communication through the GPRS/3G/4G by erecting an antenna, and finally the judgment result of the fault positioning is uploaded to a terminal monitoring center.
The method is mainly applied to judging the short-circuit fault section of the long cable line of 110kV or more. Once short-circuit fault occurs to the high-voltage long cable line, the fault section can be judged quickly. Compared with the prior art, the method can realize the judgment of the fault section of the high-voltage long cable line, can realize on-line monitoring, and can find out the fault section in time after the fault occurs.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (7)
1. A short-circuit fault section judging method of a high-voltage long cable line is used for judging which cable cross interconnection section a short-circuit fault occurs in the high-voltage long cable line composed of a plurality of cable cross interconnection sections, each cable cross interconnection section comprises a plurality of sections of wire cores which are directly connected to form a three-phase cable line, and a metal sheath is in cross connection to form a cable section of a three-section sheath connecting passage, and the short-circuit fault section judging method is characterized in that: the short-circuit fault section judging method comprises the following steps: and respectively detecting the current directions of two ends of the three sheath connecting paths in each cable cross interconnection section, and if the current directions of two ends of any one section of the sheath connecting path in one cable cross interconnection section are opposite, generating a short circuit fault in the cable cross interconnection section.
2. The method for determining a short-circuit fault section of a long high-voltage cable line according to claim 1, wherein: collecting current signals at two ends of three sheath connecting passages in each cable cross interconnection section, and performing fast Fourier transform on the current signals to obtain phase angles of the current signals; and performing phase difference operation on phase angles of current signals at two ends of each section of the protective layer connecting path so as to judge whether the current directions at two ends of each section of the protective layer connecting path are opposite or not.
3. The method for determining a short-circuit fault section of a long high-voltage cable line according to claim 2, wherein: and when the difference of the phase angle of the current signals at the two ends of any section of the protective layer connecting path is within the allowable range of the phase centered at +/-180 degrees, judging that the current directions at the two ends of the section of the protective layer connecting path are opposite.
4. The method for determining a short-circuit fault section of a long high-voltage cable line according to claim 3, wherein: the allowable range of the phase is (120 °, 240 °) u (-240 °, -120 °).
5. A short-circuit fault section judgment device that employs the short-circuit fault section judgment method of a high-voltage long cable line according to any one of claims 1 to 5, characterized in that: the short-circuit fault section judging device comprises a plurality of current transformers and a host, wherein the current transformers are used for respectively detecting current signals at two ends of each section of the sheath connecting passage in each cable cross interconnection section, the host is connected with each current transformer and judges whether short-circuit faults occur in each cable cross interconnection section, and the host is in remote communication connection with a monitoring center.
6. The short-circuit failure section determination device according to claim 5, characterized in that: every section the both ends of sheath connecting channel all connect the grounding box, current transformer set up in grounding box department.
7. The short-circuit failure section determination device according to claim 5, characterized in that: the host computer is in remote communication with the monitoring center through the GPRS/3G/4G network through the antenna.
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| CN108646144A (en) * | 2018-07-25 | 2018-10-12 | 国家电网有限公司 | A kind of offline distance measuring method of high voltage single-core cable short trouble, apparatus and system |
| CN108646143A (en) * | 2018-07-12 | 2018-10-12 | 广东电网有限责任公司东莞供电局 | Single-core power cable fault detection structure based on circulation measurement and fault detection method thereof |
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