CN212364468U - Underground cable time synchronization device and fault positioning system - Google Patents
Underground cable time synchronization device and fault positioning system Download PDFInfo
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- CN212364468U CN212364468U CN202020213509.5U CN202020213509U CN212364468U CN 212364468 U CN212364468 U CN 212364468U CN 202020213509 U CN202020213509 U CN 202020213509U CN 212364468 U CN212364468 U CN 212364468U
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Abstract
The utility model provides an underground cable time synchronizer and fault location system, underground cable time synchronizer includes signal transmitter and signal receiver, signal transmitter with signal receiver installs respectively in the both ends of same cable, and with the cable armor is connected, signal transmitter is used for pouring into synchronous signal into the cable armor, signal receiver is used for following the cable armor is received synchronous signal. The fault positioning system comprises the underground cable time synchronization device and a fault recording device, wherein the fault recording device is used for recording at least two traveling wave signals in the cable. The utility model discloses can effectively avoid lasting weather and the influence of equipment fixing position to the time service precision, need not to carry out the wiring of peculiar synchronous line, utilize the inherent armor of cable, transmit synchronizing signal, effectively reduced material and cost of labor when guaranteeing the time service precision.
Description
Technical Field
The utility model relates to a power cable field, concretely relates to underground cable time synchronizer and fault location system.
Background
With the rapid growth of economy, urban cable networks are growing in size, but over time, the failures caused by the progressive ageing of the cables are increasing year by year. In order to know the operation condition of the power grid in time, analyze the cause of the fault and accurately locate the position of the fault, the time information of various emergencies in the operation process of the power grid needs to be recorded completely and accurately in real time, so that synchronous time service between power grid devices is very important. The current synchronous time service between the power grid devices mainly has two modes, one is GPS time service, and the other is synchronous line time service.
The GPS time service is a most widely used technology at present, which utilizes a high-precision atomic clock carried by a GPS satellite to generate a reference signal and a time standard and provide a time service covering the whole world, and the time service precision is as high as 20 billionth of a second. The GPS time service system mainly utilizes the characteristic of GPS accurate time service to realize the unified time service of the device, and a GPS receiver simultaneously receives 4-8 satellite signals in the visual field range at any moment and outputs time signals after processing. GPS time service does not need wiring, and the time service precision is high, but receives weather and mounted position influence big, and the rainy day can appear the time service precision and reduce the condition that can not even time service, and then leads to the cable fault location inefficacy.
Synchronous line time service technique is the installation synchronous line between the equipment that needs carry out time synchronization, and this technique synchronizing time is accurate, does not receive weather and mounted position's influence, but need carry out artifical wiring, and material cost and cost of labor are high, and when the underground that synchronous line need bury, the requirement synchronous line has high corrosion resistance, and is high to the requirement for quality of synchronous line simultaneously.
The chinese patent application with application number 201711249223.1 discloses a system, method and device for fault location based on time synchronization, wherein the system includes a first synchronous routing device for providing a first clock signal to a second synchronous routing device; the second synchronous routing device is connected with the first synchronous routing device and used for synchronizing a second clock signal of the second synchronous routing device with the first clock signal according to the first clock signal and synchronizing all-time signals among the second synchronous routing devices; the synchronous positioning device is connected with the second synchronous routing device and used for acquiring cable data in the cable according to the clock signal output by the second synchronous routing device; and the monitoring host is connected with the synchronous positioning device through the first synchronous routing device and the second synchronous routing device and is used for processing the cable data and determining the position of the fault. The system can solve the problem that fault points of cables cannot be accurately positioned due to poor clock synchronization performance of double-end monitoring equipment, but clock signals are transmitted between a first synchronous routing device and a second synchronous routing device through the Ethernet, Ethernet infrastructure needs to be arranged to provide guarantee for system operation, and time synchronization speed is easily influenced by network transmission speed.
SUMMERY OF THE UTILITY MODEL
For solving at least one among the above technical problem that exists among the prior art, the utility model provides an underground cable time synchronizer.
The underground cable time synchronizer comprises a signal transmitter and a signal receiver, wherein the signal transmitter and the signal receiver are respectively installed at two ends of the same cable and are connected with a cable armor, the signal transmitter is used for injecting a synchronizing signal into the cable armor, and the signal receiver is used for receiving the synchronizing signal from the cable armor.
Preferably, the signal transmitter is connected to a cable sheath by a clamp for coupling the synchronization signal to the cable sheath.
In any of the above solutions, it is preferable that the signal transmitter is connected to a cable sheath through a wire for directly injecting the synchronization signal into the cable sheath.
In any of the above solutions, it is preferable that the signal receiver is connected to a cable sheath through a clamp for coupling and receiving the synchronization signal from the cable sheath.
In any of the above aspects, it is preferable that the signal receiver is connected to the cable sheath through a wire for directly receiving the synchronization signal from the cable sheath.
In any of the above schemes, preferably, the signal receiver includes at least one of a signal amplification filtering unit, an AD acquisition unit, a high-precision crystal oscillator clock calibration unit, and a data processing unit, and is configured to acquire the synchronization signal and determine the number of pulses and the trigger time, so as to determine the synchronization time difference.
In any of the above schemes, preferably, the synchronization signal is a single pulse voltage signal or a single pulse current signal which is periodically transmitted.
In any of the above schemes, preferably, the transmission period of the synchronization signal is a multiple of the power frequency period.
In any of the above schemes, preferably, the synchronization signal is a multi-pulse voltage signal or a multi-pulse current signal which is periodically transmitted.
In any of the above schemes, preferably, the signal transmitter includes a voltage boosting unit, configured to adjust a transmission power of the synchronization signal.
The second aspect of the utility model provides an underground cable fault positioning system, it includes underground cable time synchronizer still includes trouble record ripples device, trouble record ripples device is arranged in the at least two traveling wave signals of admission cable, and its position of admission cable traveling wave signal is no longer than signal transmitter and pours into synchronizing signal and signal receiver and receive cable range between the synchronizing signal.
Preferably, the fault recording device includes a first fault recording device and a second fault recording device, the first fault recording device is installed at the signal transmitter end and is used for recording the traveling wave signal at the position where the synchronous signal is injected into the cable sheath, and the second fault recording device is installed at the signal receiver end and is used for recording the traveling wave signal at the position where the synchronous signal is received.
In any of the above aspects, preferably, the first fault recording device is integrally mounted with the signal transmitter, and/or the second fault recording device is integrally mounted with the signal receiver.
In any of the above schemes, preferably, the underground cable fault location system further includes a control center, the control center is in communication connection with the fault recording device, the fault recording device uploads the recorded traveling wave signal to the control center, and the control center performs analysis processing according to the received data to locate the cable fault.
In any of the above schemes, preferably, the signal receiver sends the determined synchronization time to the fault recording device or to a control center.
In any of the above solutions, preferably, the workflow of the cable fault location system includes the steps of:
the signal emitter emits a synchronous signal;
the signal receiver receives the synchronous signal;
determining a synchronization time difference;
the fault recording device records traveling wave signals in the cable;
and when the traveling wave signal comprises fault traveling waves, determining the fault position according to the synchronous time difference and the traveling wave signal recorded by the fault recording device.
In any of the above schemes, preferably, the synchronization signal is a single pulse voltage signal or a single pulse current signal which is periodically transmitted.
In any of the above schemes, preferably, the transmission period of the synchronization signal is a multiple of the power frequency period.
In any of the above schemes, preferably, the synchronization signal is a multi-pulse voltage signal or a multi-pulse current signal which is periodically transmitted.
In any of the above schemes, preferably, the signal receiver processes the received synchronization signal to determine the synchronization time difference.
In any of the above schemes, preferably, the signal receiver sends the determined synchronization time difference to a fault recording device or a control center.
In any of the above embodiments, preferably, the fault recording device sends the received synchronization time difference and the recorded traveling wave signal to a control center.
In any of the above solutions, preferably, the control center determines the cable fault location according to the received synchronization time difference and the traveling wave signal.
In any of the above schemes, preferably, the control center may further analyze the cable fault type according to the received traveling wave signal, and determine the cable fault type.
The utility model discloses an underground cable time synchronizer, fault location system and method can effectively avoid bad weather and the influence of equipment fixing position to the time service precision, when the cable trouble, to the location of trouble more accurate; the wiring of a special synchronous wire is not needed, the inherent armor of the cable is utilized to transmit a synchronous signal, and the time service precision is ensured while the material and labor cost is effectively reduced; meanwhile, the traveling wave speed of the synchronous signals in the cable is high, the time synchronization speed between the devices is high, and the fault positioning precision is higher.
Drawings
Fig. 1 is a schematic structural view of a preferred embodiment of the underground cable time synchronizer according to the present invention.
Fig. 2 is a schematic structural diagram of another embodiment of the underground cable time synchronizer according to the present invention.
Fig. 3 is a schematic structural diagram of yet another embodiment of the underground cable time synchronizer according to the present invention.
Fig. 4 is a schematic diagram of a fourth embodiment of the underground cable time synchronizer transmitting a synchronization signal according to the present invention.
Fig. 5 is a schematic diagram of fault location in accordance with a preferred embodiment of the underground cable fault location system of the present invention.
Fig. 6 is a schematic workflow diagram of the embodiment of the underground cable fault location system as shown in fig. 5 according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments in order to make the present invention better understood by those skilled in the art. It should be understood that the described embodiments are only a part of the detailed description of the present invention, and not all embodiments, and that other real-time manners made by those skilled in the art without inventive labor based on the illustrated embodiments of the present invention are within the scope of the present invention.
Example 1
As shown in fig. 1, the underground cable time synchronizer comprises a signal transmitter 11 and a signal receiver 12, wherein the signal transmitter 11 and the signal receiver 12 are respectively installed at two ends of the same cable and connected with the cable armor 10, the signal transmitter 11 is used for injecting a synchronization signal into the cable armor 10, and the signal receiver 12 receives the synchronization signal from the cable armor 10 when the synchronization signal travels to the signal receiver along the cable armor. The signal transmitter 11 couples the synchronization signal to the cable sheath 10 through a clamp 13, and the signal receiver 12 is connected with the cable sheath 10 through the clamp 13 for coupling and receiving the synchronization signal from the cable sheath 10.
The signal receiver 12 includes at least one of a signal amplification filtering unit, an AD collecting unit, a high-precision crystal oscillator clock calibration unit, and a data processing unit, the signal amplification filtering unit is used for amplifying and filtering the received synchronous signals, the AD collecting unit is used for converting the collected analog signals into digital signals, the high-precision crystal oscillator clock calibration unit and the data processing unit are used for determining the number and the trigger time of the synchronous signals, and further determining the synchronous time difference.
The synchronization signal may be a single pulse voltage signal transmitted periodically, or a single pulse current signal transmitted periodically, or a multi-pulse voltage signal transmitted periodically, or a multi-pulse current signal transmitted periodically. The synchronization signal adopts a single pulse signal, the time synchronization difficulty is small, the precision is high, but the anti-interference capability is not as good as that of a multi-pulse signal; the synchronous signal adopts multi-pulse signal, the time synchronization degree of difficulty is big, the precision is low, but the interference killing feature is strong.
The synchronous signal is a single pulse voltage signal which is periodically transmitted, and the transmission period of the synchronous signal is a multiple of the power frequency period, because the electronic elements of the signal receiver 12 have difference, the time for receiving the synchronous signal has a slight deviation, and the influence caused by the deviation can be effectively reduced by adopting the multiple of the power frequency period as the period transmission synchronous signal. Other periods of transmitting the synchronization signal may be used when the time synchronization accuracy requirement is not particularly high. In view of the power frequency period of 20ms in China, in this embodiment, the period of the synchronization signal is 20ms times. The synchronous signal transmitting period can also be adjusted according to the power frequency periods of other countries or regions.
The signal transmitter 11 is provided with a voltage boosting unit for adjusting the transmitting power of the synchronization signal, and after adjustment, the transmitting power of the synchronization signal can reach a large variation range, so that the requirements of different cable lengths between the signal transmitter 11 and the signal receiver 12 are met, and the signal receiver 12 can also effectively receive the synchronization signal when the cable length between the signal receiver 12 and the signal transmitter 11 is too long, so as to perform time synchronization.
The clamp is a clamp commonly used in the current power cable industry, such as a clamp widely used for a power cable identification instrument or a clamp for taking electricity from a high-voltage line, as long as the clamp can couple the synchronization signal to the cable armor or can receive the synchronization signal from the cable armor in a coupling manner. The clamp is directly connected with the signal transmitter 11 and/or the signal receiver 12 by adopting a lead, or a socket is arranged on the signal transmitter 11 and/or the signal receiver 12, and the clamp is connected with the signal transmitter 11 and/or the signal receiver 12 in a plugging mode. The structure, operation principle, connection mode with the cable, etc. of the clamp are not innovative points of the present application, and are not specifically described herein, and can be understood by referring to the prior art.
Example 2
As shown in fig. 2, the underground cable time synchronizer comprises a signal transmitter 11 and a signal receiver 12, wherein the signal transmitter 11 and the signal receiver 12 are respectively installed at two ends of the same cable and connected with the cable armor 10, the signal transmitter 11 is used for injecting a synchronization signal into the cable armor 10, and the signal receiver 12 receives the synchronization signal from the cable armor 10 when the synchronization signal travels to the signal receiver along the cable armor.
In contrast to the first exemplary embodiment, signal transmitter 11 couples the synchronization signal to cable sheath 10 via clamp 13, and signal receiver 12 is directly connected to cable sheath 10 via a line for directly receiving the synchronization signal from cable sheath 10. The signal receiver 12 has two conductors, one of which is connected directly to the cable sheath 10 and the other of which is connected to a cable ground braid 14, the cable ground braid 14 being connected to the cable sheath 10 as is known to those skilled in the art.
Unlike the first embodiment, the signal receiver 12 further includes a communication unit, configured to perform data transmission with other devices, send the determined synchronization time difference to other devices, and also send alarm information to the control center when time synchronization fails.
Example 3
As shown in fig. 3, a time synchronizer for underground cable is different from the second embodiment in that the signal transmitter 11 is connected with the cable sheath 10 through a wire for directly injecting the synchronization signal into the cable sheath 10, and the signal receiver 12 is connected with the cable sheath 10 through a clamp 13 for coupling and receiving the synchronization signal from the cable sheath 10.
Example 4
As shown in fig. 4, a time synchronizer for underground cable is different from the second embodiment in that the signal transmitter 11 is connected to the cable sheath 10 through a wire for directly injecting the synchronization signal into the cable sheath 10, and the signal receiver 12 is directly connected to the cable sheath 10 through a wire for directly receiving the synchronization signal from the cable sheath 10.
After the installation of the signal transmitter 11 and the signal receiver 12 is completed, the length L of the cable between the signal transmitter 11 and the signal receiver 12 is a known quantity. The traveling wave speed V of the signal in the cable armor is different from that of different types of cables, but the traveling wave speed V of the signal is known for the same type of cable, and the type of the corresponding cable is also known after the underground cable time synchronization device is installed.
The signal transmitter 11 transmits a single-pulse signal at time T1, the signal receiver 12 receives the single-pulse signal at time T2, and T2-T1 is L/V, it should be understood that the synchronization signal received by the signal receiver 12 at time T2 is transmitted by the signal transmitter 11 at time T1, and there is a time difference L/V between the transmission of the synchronization signal by the signal transmitter 11 and the reception of the synchronization signal by the signal receiver 12. And time synchronization can be realized according to the time difference L/V, so that the cable fault is accurately positioned.
Example 5
As shown in fig. 5, an underground cable fault location system includes the underground cable time synchronization device, and further includes a fault recording device, where the fault recording device is configured to record at least two traveling wave signals in a cable, and the position of recording the traveling wave signals in the cable does not exceed the cable range between the signal transmitter 11 injecting the synchronization signals and the signal receiver 12 receiving the synchronization signals.
In this embodiment, the fault recording apparatus includes a first fault recording apparatus 61 and a second fault recording apparatus 62, where the first fault recording apparatus 61 is installed at the signal transmitter end 61 and is used to record the traveling wave signal at the position where the synchronization signal is injected into the cable sheath 10, and the second fault recording apparatus 62 is installed at the signal receiver end 12 and is used to record the traveling wave signal at the position where the synchronization signal is received.
In this embodiment, the first fault recording device 61 is installed separately from the signal transmitter 11, and the second fault recording device 62 is installed separately from the signal receiver 11.
In this embodiment, the underground cable fault location system further includes a control center, the control center is in communication connection with the first fault wave recording device 61 and the second fault wave recording device 62, the first fault wave recording device 61 and the second fault wave recording device 62 upload recorded traveling wave signals to the control center, the signal receiver further sends the determined synchronization time difference to the synchronization center, and the control center performs analysis processing according to the received traveling wave signals and the synchronization time difference to locate a cable fault. Meanwhile, the control center can analyze the cable fault type according to the received traveling wave signal to determine the cable fault type.
The fault recorder is already applied to the power system, and the structure, the operating principle, the connection mode and the like of the fault recorder are not innovative points of the present application, and are not specifically described herein, and can be understood with reference to the prior art.
Example 6
As shown in fig. 6, the workflow of fault location by the cable fault location system according to embodiment 5 includes the steps of:
s50: the signal emitter emits a synchronous signal;
s51: the signal receiver receives the synchronous signal;
s52: determining a synchronization time difference;
s53: the fault recording device records traveling wave signals in the cable;
s54: and when the traveling wave signal comprises fault traveling waves, determining the fault position according to the synchronous time difference and the traveling wave signal recorded by the fault recording device.
In this embodiment, it is preferable that the synchronization signal is a single pulse voltage signal that is periodically transmitted, and a transmission period of the synchronization signal is a multiple of 20 ms.
As shown in fig. 5, for a certain cable, the signal transmitter 11 injects the length Lm of the cable between the position where the synchronization signal is injected to the cable sheath 10 and the position where the synchronization signal is received by the signal receiver 12 from the cable sheath 10, and for this type of cable, the traveling wave velocity is Vm/us, and the synchronization time difference T between the first wave recording device 61 and the second wave recording device 62 is L/V. The traveling wave sampling frequency of the first wave recording device 61 is F1MHZ, and the traveling wave sampling frequency of the second wave recording device 62 is F2MHZ, so that, in a certain synchronization cycle, when the first wave recording device 61 samples the L/V × F1+1 point, the second wave recording device 62 starts to sample the 1 st point. At a certain moment, at a position which is at a distance L1m from the first wave recording device 61, a cable breaks down (shown by lightning symbols in the figure), a fault traveling wave propagates from a fault point to two sides, the first wave recording device 61 starts to record a first sampling point of the fault traveling wave after sampling X points, and the second wave recording device 62 starts to record the first sampling point of the fault traveling wave after sampling Y points. We get the following relationships:
L1+L2＝L…………………………(1)
T＝L/V……………………………(2)
(L1-L2)/V＝X/F1-Y/F2-T………………(3)
from this, L1 ═ X × V/(2 × F1) -Y × V/(2 × F2), that is, the failure occurrence position can be determined.
For example, it is known that the distance of L is 32km, the traveling wave speed is 200m/us, the sampling frequency F1MHZ of the first fault wave recording device and the sampling frequency F2MHZ of the second fault wave recording device are both 1MHZ, in a certain synchronization period, the first fault wave recording device starts to acquire a first sampling point of the fault traveling wave after sampling 230 points, and the second fault wave recording device starts to acquire a first sampling point of the fault traveling wave after sampling 90 points, so that it can be determined that L1 is 14km and L2 is 18km, that is, the fault position of the cable is accurately located.
And verifying the positioning result. In the synchronization period, because the length of the cable between the first fault wave recording device and the second fault wave recording device is 32km, and the traveling wave speed is 200m/us, the time taken for the synchronization signal to travel from the first wave recording device to the second wave recording device is 160us, because the sampling frequency F1MHZ of the first fault wave recording device and the sampling frequency F2MHZ of the second fault wave recording device are both 1MHZ, that is, the first fault wave recording device and the second fault wave recording device sample 1 point every 1 us. In a synchronous period, when the first fault recording device samples 160 points and then samples 161 th point, the second fault recording device starts to sample the first point in the synchronous period. The 231 th point sampled by the first fault recording device is the first point of the fault travelling wave recorded by the first fault recording device, and the 91 th point sampled by the second fault recording device is the first point of the fault travelling wave recorded by the second fault recording device, namely, the time spent by the fault travelling wave to the first fault recording device is 20us less than that to the second fault recording device. According to the positioning result, the L1 is 14km, the L2 is 18km, the time spent by the fault travelling wave to the first fault wave recording device is 70us, the time spent by the fault travelling wave to the second fault wave recording device is 90us, and the time spent by the fault travelling wave to the first fault wave recording device is just 20us less than that spent by the fault travelling wave to the second fault wave recording device, which indicates that the fault is positioned correctly.
Example 7
The underground cable fault positioning system is different from the embodiment 5 in that the first fault recording device 61 is integrated with the signal transmitter 11 to form transmitting end equipment, and the system has the functions of transmitting synchronous signals, collecting traveling wave signals in a cable and uploading traveling wave signals; the second fault recording device 62 is integrated with the signal receiver 12 to form a receiving end device, and has the functions of receiving a synchronization signal, determining a synchronization time difference, collecting a traveling wave signal in a cable, and collecting an uplink traveling wave signal and the synchronization time difference.
In this embodiment, the control center is connected to multiple sets of transmitting end devices and receiving end devices to form a distributed cable fault location system, which is used to perform fault location on multiple cables in a cable network. When the number of cables needing fault location is large, a plurality of control centers can be arranged, and each control center is responsible for locating a certain number of cable faults and analyzing cable fault types to determine the cable fault types.
Example 8
An underground cable fault location system is different from the embodiment 5 in that the first fault recording device 61 is installed between a synchronous signal injection cable armor and a signal receiver synchronous signal receiving position and is close to the synchronous signal injection cable position, and the second fault recording device 62 is installed between the synchronous signal injection cable armor and the signal receiver synchronous signal receiving position and is close to the signal receiver synchronous signal receiving position. According to the synchronous time difference L/V, the cable length between the first fault recording device 61 and the second fault recording device 62 and the cable length between the signal transmitter and the signal receiver, the cable fault can be accurately positioned.
Example 9
An underground cable fault positioning system is different from the embodiments 5, 6 or 7 in that at least one other fault recording device is arranged between a first fault recording device 61 and a second fault recording device 62, and the cable fault positioning system is suitable for scenes with longer cable length or needing to perform particularly accurate positioning on faults. The control center firstly determines the cable fault position according to the traveling wave signals recorded by the first fault wave recording device 61 and the second fault wave recording device 62, then determines the nearest fault wave recording devices on two sides of the cable fault position, and then further positions the cable fault position according to the traveling wave signals recorded by the nearest fault wave recording devices on two sides of the fault position, and the iteration is carried out until an accurate positioning result is determined.
It should be noted that the above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the foregoing embodiments illustrate the present invention in detail, those skilled in the art will appreciate that: it is possible to modify the solutions described in the foregoing embodiments or to substitute some or all of the technical features thereof, without departing from the scope of the present invention. The terms "first" and "second" used in this specification are used for distinguishing similar objects and not for limiting the sequence of the objects, and it should be understood that the terms may be interchanged under certain circumstances without affecting the technical solutions of the present application. Furthermore, the terms "comprising," "having," and any variations thereof, are intended to cover non-exclusive inclusions.
Claims (11)
1. An underground cable time synchronization device, its characterized in that: the cable armor is characterized by comprising a signal transmitter and a signal receiver, wherein the signal transmitter and the signal receiver are respectively arranged at two ends of the same cable and are connected with the cable armor, the signal transmitter is used for injecting a synchronous signal into the cable armor, and the signal receiver is used for receiving the synchronous signal from the cable armor.
2. An underground cable time synchronizing device according to claim 1, wherein: the signal transmitter is connected with a cable sheath through a clamp for coupling the synchronization signal to the cable sheath.
3. An underground cable time synchronizing device according to claim 1, wherein: the signal transmitter is connected with the cable armor through a lead and is used for directly injecting the synchronous signal into the cable armor.
4. An underground cable time synchronizing device according to claim 1, wherein: the signal receiver is connected with a cable armor through a clamp and is used for receiving the synchronous signal from the cable armor in a coupling mode.
5. An underground cable time synchronizing device according to claim 1, wherein: the signal receiver is connected with the cable armor through a conducting wire and used for directly receiving the synchronous signal from the cable armor.
6. An underground cable time synchronizer according to any one of claims 1, 4 and 5, wherein said signal receiver comprises at least one of a signal amplification filtering unit, an AD acquisition unit, a high-precision crystal oscillator clock calibration unit and a data processing unit, and is used for acquiring said synchronization signal and determining the number of pulses and the triggering time, and further determining the synchronization time difference.
7. An underground cable time synchronizing device according to any one of claims 1 to 3, wherein: the signal transmitter comprises a boosting unit for adjusting the transmitting power of the synchronous signal.
8. An underground cable fault location system which characterized in that: the underground cable time synchronization apparatus of claim 1 further comprising fault recording means for recording at least two traveling wave signals in the cable at locations not exceeding the cable range between the injection of synchronization signals by the signal transmitter and the reception of said synchronization signals by the signal receiver.
9. An underground cable fault location system as recited in claim 8, wherein: the fault recording device comprises a first fault recording device and a second fault recording device, the first fault recording device is installed at the signal transmitter end and used for recording traveling wave signals at the position where the synchronous signals are injected into the cable armor, and the second fault recording device is installed at the signal receiver end and used for recording the traveling wave signals at the position where the synchronous signals are received.
10. An underground cable fault location system as claimed in claim 9, wherein: the first fault recording device and the signal transmitter are integrally installed, and/or the second fault recording device and the signal receiver are integrally installed.
11. An underground cable fault location system as recited in claim 8, wherein: the control center is in communication connection with the fault recording device, the fault recording device uploads recorded traveling wave signals to the control center, and the control center performs analysis processing according to received data to position cable faults.
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| GR01 | Patent grant |