Method and system for detecting and warning ground wire currents in armored secondary cables

Abstract

To provide a method that can increase the speed and accuracy of detecting an armor-shielded secondary cable in a substation.SOLUTION: In each armor-shielded secondary cable, the method includes step 1 for covering each ground line with current collecting means for a tip shielding layer, a tip armoring layer, an end shielding layer, and an end armoring layer, step 2 of current collecting means for collecting a tip shielding layer ground line current, a tip armoring layer ground line current, an end shielding layer ground line current, and an end armoring layer ground line current in each armoring shielding secondary cable, step 3 for installing an overcurrent criterion and alarming the secondary cable for over-currents together with the currents collected in step 2, step 4 for installing a convection reference and alarming leakage current for the secondary cable together with the convection reference while re-synchronizing the currents collected in step 2, and step 5 for achieving detection and alarming of the ground wire current in the secondary cable by the results of the alarms according to step 3 and step 4.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the field of in-situ detection of electrical substation electrical equipment and circuits, and more particularly to a method and system for detecting and warning of ground conductor currents in armored secondary cables. [Background technology]

[0002] At present, there are no staff on duty at substations of power systems below 220kV, and few staff on duty at substations of power systems above 500kV. This is a gradual trend, and the demand for daily maintenance of substations is increasing. In recent years, electrical fires have frequently occurred in substations due to overheating of the ground wire of electric cables, which has led to challenges in operating substations safely and stably.

[0003] Currently, substations use a large amount of armored shielded secondary cables as long electric cables from switch locations to protective rooms. The shielding is generally grounded at both ends, i.e., both ends are connected to the secondary ground grid via ground wires. Currently, armored layers are grounded in a variety of ways, but a typical form for armored layer grounding is that both ends are grounded (both ends are connected to the primary ground grid via ground wires). Armored shielded secondary cables using such grounding forms can generate heat in several cases: 1. In some substations, a relatively large current flows through the shield ground wire of a secondary cable due to the action of a temporary interference source (such as lightning or a disconnector). The current flows through the shield, the shield ground wire and the ground grid. 2. In some substations, a relatively large current flows through the armor layer ground conductor due to the action of a temporary interference source (such as lightning or a disconnector), and the current flows through the armor layer, the armor layer ground conductor and the ground grid. 3. During construction and operation, the shielding ground wire and armor ground wire in the secondary cable may be short-circuited for some reason (the armor penetrates the shielding layer, or the twisted wire between the shielding ground wire and the armor ground wire is no longer tight), resulting in a localized closed circuit in the ground wire. A stable interference source (such as near an air-core reactor) acts on a substation, causing a relatively large current to flow through the armor ground wire and the shielding side ground wire. The current mainly flows through the short-circuited part of the shielding armor layer, the shielding ground wire, the armor ground wire, and the earth grid. 4. In the case of a secondary cable, insulation in the shielding layer may be destroyed, causing the current flowing through the shielding layer to be shunted at the point where the shielding layer is destroyed, resulting in an electric leakage point in the shielding layer. 5. In the secondary cable, the insulation of the armor layer is destroyed, and the current flowing through the armor layer is shunted at the destroyed point of the armor layer, resulting in a leakage point in the armor layer.

[0004] In the above five cases, especially in the third case, when an overcurrent is detected, and in the latter two cases when a leakage current is detected, if the detection is not immediate and a large current continues to flow for a long period of time, heat is likely to be generated, and the corresponding cable may even be burned.

[0005] In order to prevent electric cables from causing accidents, it is necessary to detect armored secondary cables in substations. At present, there are two main ways to detect armored secondary cables in substations: (1) A method of manual visual inspection. Since there is currently no specialized means of detecting the ground wire of armored secondary cables, the conventional method is for the maintenance personnel of the substation to manually check visually. For example, when inspecting a terminal box, the maintenance personnel will observe whether there are any abnormalities in the appearance of the electric cable and ground wire, whether there is a burnt smell, etc. (2) Infrared temperature measurement method. For armored secondary cables and associated grounding wires, substation maintenance personnel measure the temperature with a handheld infrared sensor to detect whether the temperature of the electrical cables and grounding wires is too high.

[0006] However, the conventional detection methods have at least the following problems. 1. Issues that are not timely It will be necessary to carry out manual inspection, whether it is a visual inspection or an infrared temperature measurement, on the terminal box or protective shield near the earth wire, and even if the inspection frequency is high and even in a substation with a particularly high voltage of 1000 kV, it must be inspected only once or twice a day. Even if the inspection frequency for the task of ensuring power (four times a day) is limited to a few hours between two inspections, the entire process from the start of abnormal heating to burning of the secondary cable is sufficiently covered. 2. Limited detection accuracy Manual visual inspection methods are highly dependent on the subjective judgment of the person in charge, and whether or not a problem can be found depends on the level of ability and mental state of the maintenance person, the stage at which the failure is progressing, etc., making it difficult to find failures accurately. Although the method of measuring temperature using infrared rays is less dependent on the subjectivity of the person in charge than the method of manual visual inspection, there is still the problem of whether the location where the temperature is measured is blocked or not, and the timing of the temperature measurement depends on the stage at which the current malfunction is progressing, so the probability of accurately detecting the malfunction is not high. Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention overcomes the deficiencies existing in the prior art by providing a method and system for detecting and warning ground wire current in armored secondary cables, which can increase the speed and accuracy of detecting armored secondary cables in power substations. [Means for solving the problem]

[0008] The present invention employs the following technical solutions. The method for detecting and warning of earth conductor current in armored secondary cables is as follows: Step 1: for each armored secondary cable, covering the leading edge shielding ground wire with CT11, covering the leading edge shielding ground wire with CT12, covering the terminal shielding ground wire with CT21, and covering the terminal armoring ground wire with CT22; Step 3: setting an overcurrent reference and, together with the current collected in step 2, alarming the secondary cable for overcurrent; Step 4 of establishing a convection reference and, together with the convection reference, alarming the secondary cable for a leakage current while resynchronizing the currents collected in step 2; and Step 5 includes detecting and providing an alarm on the ground wire current in the secondary cable according to the results of the alarms in steps 3 and 4.

[0009] Preferably, step 3 comprises: Establish a shielding grounding conductor overcurrent standard and measure the shielding grounding conductor overcurrent at the tip of the armored shielded secondary cable. JPEG0007634058000002.jpg18170JPEG0007634058000003.jpg16170 Step 3-2 of transmitting an overcurrent alarm signal for the armor layer in the primary cable; and and sending a local close-circuit overcurrent alarm signal in the secondary cable after a predetermined delay t3 has elapsed.

[0010] Preferably, in step 3-1, a shielding ground wire overcurrent criterion is JPEG0007634058000005.jpg27170 or JPEG0007634058000006.jpg13170 or JPEG0007634058000007.jpg11170JPEG0007634058000008.jpg25170Preferably, in step 3-2, an armor layer ground conductor overcurrent criterion is JPEG0007634058000009.jpg28170 or JPEG0007634058000010.jpg12170 or JPEG0007634058000011.jpg11170JPEG0007634058000012.jpg25170

[0011] Preferably, in step 3-3, a local closing current reference in the secondary cable is JPEG0007634058000013.jpg21170JPEG0007634058000014.jpg8170 are the continuity warning values.

[0012] Preferably, step 4 comprises: It judges whether resynchronization is necessary according to the communication status, and if so, it Step 4-2 of transmitting an alarm indicating that the shielding layer of the secondary cable has become leaky according to the result of judging the shielding layer current difference while making a judgment using different shielding layer current difference standards for each of the shielding layer current difference judgment results; and and transmitting an alarm indicating that the shield layer of the secondary cable has become leaky according to a result of judging the shield layer current difference while making a judgment using different shield layer current difference standards for each of the shield layer current difference judged by the respective judgements.

[0013] Preferably, in step 4-1, the resynchronized electric cable terminal shield ground wire voltage is The combined signal of JPEG0007634058000017.jpg17170 is continuously transmitted for 100 ms, and the data collection means is JPEG0007634058000018.jpg25170 further comprising a shield ground current; JPEG0007634058000019.jpg23170

[0014] Preferably, step 4-2 comprises: JPEG0007634058000020.jpg7170First shield layer current difference standard JPEG0007634058000021.jpg31170, JPEG0007634058000022.jpg26170, JPEG0007634058000023.jpg7170, and the second shielding layer current difference standard is JPEG0007634058000024.jpg15170 When the first shielding layer current difference criterion or the second shielding layer current difference criterion is satisfied, the shielding layer current difference criterion is deemed to be satisfied, and at this time, when a fourth predetermined delay t4 has elapsed, a warning signal is sent to indicate that the shielding layer of the secondary cable has become leaky.

[0015] Using the JPEG0007634058000025.jpg7170 standard, the first armor layer current difference standard is JPEG0007634058000026.jpg31170, JPEG0007634058000027.jpg44170, and the second armor layer current difference standard is JPEG0007634058000028.jpg12170When the first armor layer current difference criterion or the second armor layer current difference criterion is met, the armor layer current difference criterion is said to be met, and at this time, when the fifth predetermined delay t5 has elapsed, an alarm signal is sent to indicate that the armor layer of the secondary cable has become leaky.

[0016] The present invention includes a current collecting means, a resynchronizing means and an alarm determining means, Wherein, a current collecting means is installed in each armored shielded secondary cable, and the current collecting means is for collecting a leading shielding layer ground wire current, a leading armoring layer ground wire current, a terminal shielding layer ground wire current and a terminal armoring layer ground wire current in each armored shielded secondary cable; The resynchronization means is capable of determining whether it is necessary to resynchronize the terminal shield ground wire current and the terminal shield ground wire current of the armored secondary cable, and resynchronizes the currents that are determined to be necessary; The alarm judgment means can set alarm criteria for shielding layer overcurrent, armoring layer overcurrent, localized closed circuit overcurrent, shielding layer leakage and armoring layer leakage in the secondary cable, and receives current information from the current collection means and resynchronization means to obtain alarm results. A system for detecting and issuing an alarm for a ground wire current in an armored shielded secondary cable is further provided.

[0017] The present invention further provides a terminal having a processor and a storage medium, the storage medium for storing instructions, and the processor for performing operations based on the instructions to execute the method for detecting and alerting about ground wire current in the armored screened secondary cable.

[0018] The present invention further provides a computer readable medium having stored thereon a computer program product according to claim 1, which, when executed by a processor, provides a method for detecting and providing an alarm for ground conductor current in the armored secondary cable. Effect of the Invention

[0019] The beneficial effects of the present invention are that, compared with the prior art, the method for detecting and warning the ground wire current of an armored shielded secondary cable provided by the present invention can instantly detect the operating status of the armored shielded secondary cable in a substation and accurately detect faults, thereby increasing the detection level of the armored shielded secondary cable in the substation; the present invention can instantly detect the appearance of current and detect and warn of faults, prompting workers to take immediate repair measures to eliminate the fault; and the problem of the prior art method for detecting the ground wire current not being able to instantly detect the current can be avoided, for example, the phenomenon in which the current in the ground wire at the interval of the air-core reactor is likely to heat up and cause a fault in the ground wire. [Brief description of the drawings]

[0020] [Figure 1]FIG. 2 is a schematic diagram showing the overall flow of the method for detecting and warning about ground wire current in an armored screened secondary cable according to the present invention. [Diagram 2] FIG. 2 is a principle diagram showing the basic logic of local current alarm in a secondary cable according to the present invention. [Diagram 3] FIG. 2 is a schematic diagram showing the configuration of an electrical cable in a system for detecting and warning about ground wire current in an armored shielded secondary cable according to the present invention. [Figure 4] This is a principle diagram showing the basic logic of the alarm regarding the occurrence of a leakage current in the secondary cable armor layer and shielding layer according to the present invention. [Diagram 5] FIG. 1 is a schematic diagram showing the configuration of a system for detecting and issuing an alarm about a ground wire current in an armored shielded secondary cable according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] In order to clarify the purpose, technical means and advantages of the present invention, the technical means of the present invention will be described clearly and completely below with reference to the drawings together with the embodiments of the present invention. The embodiments described in this application are only a part of the embodiments of the present invention, and are not all of the embodiments. Any other embodiments made by those skilled in the art based on the spirit of the present invention without creative work are all within the protection scope of the present invention.

[0022] As shown in Figure 1, the present invention provides a method for detecting and warning the ground wire current of an armored shielded secondary cable, which specifically includes the following steps: In step 1, for each armored secondary cable, the leading shielding ground wire is covered with CT11, the leading armoring ground wire is covered with CT12, the terminal shielding ground wire is covered with CT21, and the terminal armoring ground wire is covered with CT22. Among them, in the substation, an armored shielded secondary cable is generally used as a long electric cable from the switch location to the protection room. The shielding layer of the secondary cable is grounded at both ends, that is, both ends are connected to the secondary ground grid via a ground wire. The secondary ground grid includes an equipotential ground grid and a secondary copper bar. The armored shielded secondary cable has a front end as the protection room and a rear end as the terminal box at the switch location. The front end of the secondary cable is connected to the equipotential ground grid and the rear end is connected to the dedicated copper bar in the drawing, which is the secondary copper bar. In other words, the grounding form of the armored layer of the secondary cable according to the present invention is such that both ends are connected to the primary ground grid via a ground wire, so that the armored layer is grounded. The primary power system is the main ground grid.

[0023] As shown in Figure 3, in the armored shielded secondary cable, the tip (M side, inside the protected room) shielding layer ground wire is covered with CT11, the armored layer shielding layer ground wire is covered with CT12, and the end (N side, terminal box at the switch location) of the electrical cable is covered with CT21 and the armored layer ground wire is covered with CT22.

[0024] Step 2: The current collecting means is connected to the distal shield of each of the armored shielded secondary cables. JPEG0007634058000029.jpg is considered to have 16,170 data points.

[0025] Step 3 establishes an overcurrent criterion and, together with the current sampled in step 2, alerts the secondary cable of overcurrent. Specifically, as shown in FIG. 2, step 3 further includes: Step 3-1 is to set the shielding layer grounding conductor overcurrent standard and to If so, a shield overcurrent alarm signal is sent for the secondary cable once a first predetermined delay t1 has elapsed.

[0026] Preferably, referring to the predetermined value of the conventional overload warning, the first predetermined delay t1 is set as 10s. Among them, the shielding layer grounding conductor overcurrent standard is JPEG0007634058000031.jpg27170 or JPEG0007634058000032.jpg13170 or JPEG0007634058000033.jpg12170JPEG0007634058000034.jpg34170JPEG0007634058000035.jpg16170If the shield ground conductor overcurrent criterion is met, and a first predetermined delay t1 has elapsed, a shield overcurrent alarm signal is sent for the secondary cable.

[0027] JPEG0007634058000036.jpg161702 has elapsed and an armor overcurrent alarm signal is sent for the secondary cable.

[0028] Preferably, the second predetermined delay t2 is set as 10 s. Among them, the armor layer ground conductor overcurrent standard is as follows: JPEG0007634058000037.jpg28170 or JPEG0007634058000038.jpg12170 or JPEG0007634058000039.jpg12170JPEG0007634058000040.jpg31170

[0029] If the armor ground conductor overcurrent criterion is met, and a shield overcurrent alarm signal is sent for the secondary cable after the second predetermined delay t2 has elapsed, if none of the three armor ground conductor overcurrent criterion formulas are met, it is determined that the armor of the secondary cable is normal and no alarm is required.

[0030] Step 3-3: Install local closing current reference in secondary cable and terminal shield ground JPEG0007634058000042.jpg7170 is met, a local current alarm signal in the secondary cable is sent upon the expiration of a third predetermined delay t3. Among them, the local closing overcurrent in the ground wire generally requires a stable interference source in the vicinity, and therefore the probability of it occurring at the tip (protected room side) of the electric cable is relatively low. Therefore, in the present invention, only the identification of the closing overcurrent at the end (terminal box side) of the electric cable is considered. It would be good. .

[0031] Preferably, the third predetermined delay t3 is set as 60s since in the scenario where it is used, the current does not flow through the entire secondary cable. The local closing current criteria in the secondary cable are JPEG0007634058000043.jpg21170JPEG0007634058000044.jpg18170This is to determine whether the image is located on the path.

[0032] If the local closing current criterion in JPEG0007634058000045.jpg25170 is met, then a local closing overcurrent alarm signal is sent for the secondary cable once a third predetermined delay t3 has elapsed.

[0033] Step 4 establishes a convection reference, resynchronizes the currents collected in step 2, and transmits a leakage alarm for the secondary cable along with the convection reference.

[0034] Step 4-1 is to determine whether resynchronization is necessary according to the communication state. JPEG0007634058000046.jpg25170

[0035] Considering the complex electromagnetic environment in a substation, when the electric cable is relatively long, the signal delays at both ends may be different. If the current collector is directly connected without considering the delay problem, the current difference may be increased or an alarm may be sent erroneously. In addition, when an optical fiber pair is used in a substation, the problem of synchronizing the current through the current collector can be solved, but the cost is too high. Therefore, the present invention provides a method for resynchronization. Based on not adding an optical channel, the effect of delay can be reduced.

[0036] Among them, judging whether resynchronization is necessary according to the communication state can be judged by those skilled in the art based on the communication delay and the communication state, and when the current communication delay is relatively small and the communication state is relatively good, it can be selected whether to perform resynchronization. When it is judged that the current communication delay is relatively large and the communication state is relatively good, resynchronization should be performed. When it is judged that the current communication state is relatively bad and it is difficult to perform correction accurately, resynchronization is not performed. In the present invention, when the code error proportion is 1*10 -5 determining that resynchronization is possible if the time t1 is lower than t2. The system sets the tip of the electrical cable as a reference point and adjusts the data at the end to the data at the tip.

[0037] JPEG0007634058000047.jpg45170 line current. The end of the electric cable is located at the terminal box of the N side switch location in Figure 3. JPEG0007634058000048.jpg16170

[0038] A different shielding current difference standard is used for judgment depending on whether the shielding current difference has been converted to JPEG0007634058000049.jpg7170 or not, and a shielding leakage alarm is sent for the secondary cable according to the result of judging the shielding current difference.

[0039] JPEG0007634058000050.jpg6170, using the first shielding layer current difference criterion, the first shielding layer current difference criterion is JPEG0007634058000051.jpg31170, JPEG0007634058000052.jpg26170JPEG0007634058000053.jpg25170

[0040] If the currents collected in step 2 are not resynchronized, the second shield current difference criterion is used, and the alarm setpoints will then take high values ​​together, i.e., a large current will flow through the shield. JPEG0007634058000054.jpg8170JPEG0007634058000055.jpg16170Furthermore, when the first shielding layer current difference criterion or the second shielding layer current difference criterion is satisfied, the shielding layer current difference criterion is deemed to be satisfied, and at this time, when the fourth predetermined delay t4 has elapsed, a shielding layer leakage alarm signal is transmitted for the secondary cable.

[0041] Preferably, the fourth predetermined delay t4 is set as 500 ms.

[0042] JPEG0007634058000056.jpg8170 depends on whether it is converted Armor Layer While making a judgment using the current difference standard, Armor Layer The current difference is then used to determine the secondary cable. Armor Layer Sends a leakage current alarm. JPEG0007634058000057.jpg7170 First armor layer current difference standard JPEG0007634058000058.jpg33170, Larger than JPEG0007634058000059.jpg35170. JPEG0007634058000060.jpg25170

[0043] JPEG0007634058000061.jpg21170JPEG0007634058000062.jpg10170

[0044] Furthermore, the armor layer current difference criterion is met if the first armor layer current difference criterion or the second armor layer current difference criterion is met, and when the fifth predetermined delay t5 has elapsed, an armor layer leakage alarm signal is sent for the secondary cable.

[0045] Preferably, the fifth predetermined delay t5 is set as 500 ms.

[0046] Step 5 realizes detecting and alarming the ground wire current in the secondary cable according to the alarm results of step 3 and step 4. The alarm results include: secondary cable shield overcurrent alarm, secondary cable armor overcurrent alarm, secondary cable local close overcurrent alarm, secondary cable shield leakage alarm and secondary cable armor leakage alarm.

[0047] The present invention further provides a system for detecting and warning the ground wire current of an armored shielded secondary cable, as shown in Figure 5. The above-mentioned method for detecting and warning the ground wire current of an armored shielded secondary cable is realized by the system, specifically, the system includes a current collecting means, a resynchronization means and an alarm judging means. Wherein, a current collecting means is installed in each armored shielded secondary cable, and the current collecting means is for collecting the leading shielding layer ground wire current, the leading armoring layer ground wire current, the terminal shielding layer ground wire current and the terminal armoring layer ground wire current in each armored shielded secondary cable. The resynchronization means is operable to determine whether it is necessary to resynchronize the distal shield ground wire current and the distal armor ground wire current in the armored secondary cable, and resynchronizes the currents determined to be necessary. The alarm judgment means can set alarm criteria for shield overcurrent, armor overcurrent, local closed circuit overcurrent, shield leakage and armor leakage in the secondary cable, and receives current information from the current collection means and the resynchronization means to obtain the alarm result.

[0048] The beneficial effect of the present invention is that, compared with the prior art, the present invention can instantly detect the operational status of armored secondary cables in substations and accurately locate faults, thereby increasing the level of detection of armored secondary cables in substations.

[0049] The present disclosure may be a system, a method and / or a computer application product, which may be a computer readable medium having stored therein instructions for implementing, by a processor, a computer readable program of each aspect of the present disclosure.

[0050] A computer readable storage medium is a physical device that holds and stores instructions for use in an instruction execution device. A computer readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any combination of the above. More specific examples of computer readable storage media (not an exhaustive list) include programmable computer disks, hard disks, random access memory (RAM), read only memory (ROM), electrically erasable programmable read only memory (EPROM or flash), static random access memory (SRAM), programmable compact disk read only memory (CD-ROM), digital versatile disk (DVD), memory stick, soft disk, mechanical encoder device (e.g., a slotted or grooved card that stores instructions), and any suitable combination of the above. As used herein, computer-readable storage media is not to be construed as ephemeral signals per se, such as radio waves or other electromagnetic waves transmitted freely, electromagnetic waves transmitted through waveguides or other transmission media (e.g., light pulses through fiber optics), or electrical signals transmitted over electrical wires.

[0051] The computer readable program instructions described herein may be downloaded from a computer readable storage medium into each computing / processing device, or may be downloaded from a network, such as the Internet, a local network, a wide area network, and / or a wireless network, to an external computer or external storage device. The network may be a copper transmission cable, a fiber optic transmission, a wireless transmission, a router, a firewall, a switch, a network gateway computer, and / or a peripheral server device. A network card or a network interface in each computing / processing device receives the computer readable program instructions from the network, and then forwards the computer readable program instructions to the computer readable storage medium in each computing / processing device for storage.

[0052] The computer program instructions for carrying out the operations of the present disclosure may be assembly language instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code programmed in any combination of one or more programming languages. The programming languages ​​may include object-oriented programming languages, such as Smalltalk, C++, and the like, and conventional procedural programming languages, such as C and other similar programming languages. The computer readable program instructions may be executed entirely on the user's computer, or only a portion of the instructions may be executed on the user's computer. The computer readable program instructions may be executed as a separate software package, or only a portion of the instructions may be executed on the user's computer and the other portion may be executed on a remote computer, or all of the instructions may be executed on a remote computer or server device. In the case of such a remote computer, the remote computer may be connected to the user's computer or an external computer (e.g., connected via the Internet by an Internet supplier) via any type of network, including a local network (LAN) or a wide area network (WAN)). In this embodiment, the state information of the computer readable program instructions may be used to customize electronic circuitry as needed, such as a programmable logic device, field programmable gate array (FPGA), or programmable logic array (PLA), that can execute the computer readable program instructions to implement aspects of the present disclosure.

[0053] Aspects of the present disclosure have been described with reference to flowcharts and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the present disclosure. It should be understood that each block in the flowcharts and / or block diagrams, and combinations of blocks in the flowcharts and / or block diagrams, are each implemented by computer-readable program instructions.

[0054] These computer readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programming data processing apparatus to form an apparatus that, when executed by a processor of the computer or other programming data processing apparatus, can implement the functions / operations specified in one or more blocks in the flowcharts and / or block diagrams. These computer readable program instructions may also be stored on a computer readable medium that causes a computer, programming data processing apparatus, and / or other apparatus to operate in a particular manner. A computer readable medium having instructions stored thereon may also comprise an article of manufacture, which includes instructions for each aspect of implementing the functions / operations specified in one or more blocks in the flowcharts and / or block diagrams.

[0055] The computer readable program instructions can be loaded into a computer, programming data processing apparatus, or other device to perform a series of operational steps, generating a computer-implemented process that causes the computer, programming data processing apparatus, or other device to execute the instructions to implement the functions / acts specified in one or more blocks in the flowcharts and / or block diagrams.

[0056] The flowcharts and block diagrams in the drawings illustrate possible architectures, functions, and operations of the systems, methods, and computer program products according to the embodiments of the present disclosure. Each block in the flowcharts or block diagrams represents a module, program segment, or part of instructions, which includes one or more executable instructions for implementing a given logical function. For equivalent permutation implementations, the functions shown in the blocks may be implemented in the order shown in the drawings. For example, two consecutive blocks may in fact be essentially executed in parallel, or may be executed in the reverse order, depending on the functionality involved. It should be noted that each block in the block diagrams and / or flowcharts and combinations of blocks in the block diagrams and / or flowcharts may be implemented by a dedicated system of hardware for executing a given function or operation, or by a combination of dedicated hardware and computer instructions.

[0057] Finally, it should be noted that the above examples do not limit the technical means of the present invention, but merely explain it. Although the present invention has been described in detail with reference to the above examples, it is understandable to those skilled in the art that the specific embodiments of the present invention can still be modified or equivalently substituted, and any modifications or equivalent substitutions that do not deviate from the spirit and scope of the present invention are included in the scope of the claims of the present invention.

Claims

1. Step 1: for each armored secondary cable, cover the leading edge shielding ground wire with CT11, cover the leading edge shielding ground wire with CT12, cover the terminal shielding ground wire with CT21, and cover the terminal armoring ground wire with CT22; Step 3: setting an overcurrent criterion and alerting the secondary cable of overcurrent along with the current sampled in step 2; Step 4: establishing a current difference reference and using the current difference reference to warn of a leakage current for the secondary cable depending on whether the currents collected in step 2 are resynchronized; and A method for detecting and warning a ground wire current in an armored shielded secondary cable, comprising: a step 5 for detecting and warning a ground wire current in the secondary cable based on the results of the alarms in steps 3 and 4.

2. Step 3 includes: Establish a shielding grounding conductor overcurrent standard and measure the shielding grounding conductor overcurrent at the tip of the armored shielded secondary cable. Step 3-1, transmitting an overcurrent alarm signal for the shielding layer in the secondary cable after a fixed delay t1 has elapsed; Step 3-2: transmitting an overcurrent alarm signal for the armor layer of the next cable; 2. The method for detecting and warning an armored secondary cable ground wire current as recited in claim 1, further comprising: step 3-3. transmitting a local close circuit overcurrent warning signal in the secondary cable after a third predetermined delay t3 has elapsed.

3. In the step 3-1, the shielding layer ground wire overcurrent standard is Or, Or, A method for detecting and warning about ground wire current in secondary cables.

4. In step 3-2, the armor layer ground conductor overcurrent standard is or or A method for detecting and providing a warning about ground wire current in a shielded secondary cable.

5. Step 3-3 is a step in which the local closing current reference in the secondary cable is 3. The method of claim 2, wherein the alarm value is continuity.

6. Step 4 includes: It judges whether resynchronization is necessary according to the communication status, and if so, it a step 4-2 of transmitting an alarm indicating that the shielding layer of the secondary cable has become leaky according to the result of judging the shielding layer current difference while making a judgment using a different shielding layer current difference standard for each of the above; and The method for detecting and warning the ground wire current of an armored shielded secondary cable as described in claim 1, further comprising step 4-3: transmitting an alarm that the armor layer of the secondary cable has become a leakage current according to the result of judging the armor layer current difference while making a judgment using different armor layer current difference standards for each of the armor layer current difference judgments.

7. In step 4-1, the terminal shield ground wire current of the electric cable that has undergone resynchronization the shield ground current; 7. The method for detecting and warning ground wire current in an armored screened secondary cable according to claim 6,

8. The step 4-2 is The first shield layer current difference standard is And then, The second shield layer current difference standard is 7. The method for detecting and warning about ground wire current in an armored shielded secondary cable as claimed in claim 6, further comprising: sending an alarm signal indicating that the shield layer of the secondary cable has become leaky after a fourth predetermined delay t4, wherein the shield layer current difference criterion is met if the first shield layer current difference criterion or the second shield layer current difference criterion is met.

9. The first armor layer current difference standard is And then, The second armor layer current difference standard is The method for detecting and warning about the ground wire current of an armored shielded secondary cable as described in claim 6, characterized in that the armor layer current difference criterion is met when the first armor layer current difference criterion or the second armor layer current difference criterion is met, and at this time, when a fifth predetermined delay t5 has elapsed, an alarm signal is sent to indicate that the armor layer of the secondary cable has become leaky.

10. A system for detecting and warning about a ground wire current in an armored shielded secondary cable using the method for detecting and warning about a ground wire current in an armored shielded secondary cable according to any one of claims 1 to 9, current collecting means, resynchronizing means and alarm determining means; Wherein, a current collecting means is installed in each armored shielded secondary cable, and the current collecting means is for collecting a leading shielding layer ground wire current, a leading armoring layer ground wire current, a terminal shielding layer ground wire current and a terminal armoring layer ground wire current in each armored shielded secondary cable; a resynchronization means capable of determining whether the distal shield ground wire current needs to be resynchronized with the distal shield ground wire current and whether the distal armor ground wire current needs to be resynchronized with the distal armor ground wire current, and resynchronizing the currents determined to be necessary; The ground wire current detection and warning system for an armored secondary cable as described in claim 1, characterized in that the alarm judgment means is capable of setting alarm criteria for shielding layer overcurrent, armor layer overcurrent, local closed circuit overcurrent, shielding layer leakage and armor layer leakage in the secondary cable, and receives current information from the current collection means and the resynchronization means to obtain the alarm result.

11. A terminal including a processor and a storage medium, the storage medium is for storing instructions; A terminal, characterized in that the processor is adapted to perform operations based on the instructions and to execute the steps of the method according to any one of claims 1 to 9.

12. A computer readable medium having stored thereon a computer program, which, when executed by a processor, causes the steps of the method according to any one of claims 1 to 9 to be implemented.

Images