Cable operation state on-line detection device

Abstract

The invention provides a cable operation state online detection device. The cable operation state online detection device comprises a temperature detection module, an insulation detection module, a data acquisition module, an alarm module and a background monitoring system, the temperature detection module comprises a plurality of temperature sensor units, and a plurality of temperature measuring points are uniformly distributed according to the length of the cable; the insulation detection module comprises a low-frequency power supply, and the low-frequency power supply is connected to a power grid through a three-phase reactor and is grounded through a ground capacitor and an insulation resistor to form a low-frequency current loop. The data acquisition module is used for acquiring, processing and transmitting temperature parameters and low-frequency current parameters; and the background monitoring system receives the temperature parameter and the low-frequency current parameter, judges the running state of the cable, and sends an instruction to the alarm module according to a judgment result. The cable operation state on-line detection device can monitor the operation temperature and the insulation state of the cable in real time, gives an alarm in time when a fault occurs, and fully guarantees the operation safety of the cable.

Description

Technical Field

[0001] The invention relates to an electric power device, in particular to an online detection device for a cable running state. Background Art

[0002] Cable is an electric energy transmission device, usually composed of several or several groups of wires, and has the characteristics of internal power supply and external insulation. Cables are widely used in urban underground power grids, power station lead-out lines, internal power supply of industrial and mining enterprises, and underwater transmission lines across rivers and seas. At present, the design life of most cables is usually 30 years. In order to ensure the safe operation of cables, manual inspections, regular inspections and real-time detection are usually used to monitor the operating status of power cables.

[0003] Chinese patent CN116500499A discloses a three-core cable fault detection device, system and method, which collect the induced potential of the three-core cable and transmit the induced potential of the three-core cable to a calculation module. The calculation module is used to calculate characteristic parameters according to the induced potential of the three-core cable, and determine the operating status of the three-core cable according to the characteristic parameters and combined with fault judgment criteria, and output the calculation results and the operating status of the three-core cable.

[0004] Chinese patent CN114236315A discloses a submarine cable operation status monitoring device and a monitoring method thereof, which can implement early warning for instantaneous transient grounding faults that occur before the cable is damaged, filter non-fault disturbance signals such as ship passages and switch closing, effectively reduce system false alarms caused by disturbances, improve alarm accuracy, and reduce false alarm rates.

[0005] Chinese patent CN106291235A discloses a method for monitoring the operating status of a railway through-line cable. The method determines whether a high-speed railway through-line cable has a transient transient fault by detecting whether a PT zero-sequence voltage transient signal is generated on the busbar of the high-speed railway through-line cable. The method monitors and records the electromagnetic transient signal generated by the high-speed railway through-line cable and flowing through the metal shielding layer. When the triggering condition is met, the method determines that a transient transient fault has occurred in the railway through-line. The railway through-line cable is given a fault warning and the distance to the fault point is indicated.

[0006] but ， These cable operation status detection schemes do not take temperature conditions into consideration and there are still deficiencies that need to be improved. Summary of the invention

[0007] The purpose of the present invention is to provide an online detection device for cable running status in view of the deficiencies in the prior art.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is: An online detection device for cable operation status, comprising a temperature detection module, an insulation detection module, a data acquisition module, an alarm module and a background monitoring system; The temperature detection module includes several temperature sensor units, and several temperature measurement points are evenly distributed according to the cable length; the insulation detection module includes a low-frequency power supply, which is connected to the power grid through a three-phase reactor and grounded through ground capacitance and insulation resistance to form a low-frequency current loop; The data acquisition module is used for the collection, processing and transmission of temperature parameters and low-frequency current parameters; the background monitoring system receives temperature parameters and low-frequency current parameters, makes a judgment on the cable operation status, and issues instructions to the alarm module based on the judgment results.

[0009] The temperature measurement range of the temperature sensor unit is -20-200°C, and the single temperature measurement time of each temperature measurement point is 10-20s. The temperature sensor unit is integrated with the cable. The temperature sensor unit is connected through the bus M-BUS to transmit the temperature data to the data acquisition module.

[0010] The temperature sensor unit includes a digital temperature sensor, a single-chip microcomputer control system and an M-BUS bus interface.

[0011] The injection frequency of the insulation detection module is 5-20 Hz.

[0012] The method for judging the operating status of the cable is that the temperature data measured by the temperature detection module is greater than the set value T0, or / and the low-frequency current signal measured by the insulation detection module is greater than the set value I0, the background monitoring system sends an open command to the alarm module, and the alarm module starts to sound an alarm; otherwise, the background monitoring system sends a close command to the alarm module, and the alarm module starts to remain closed.

[0013] The present invention has outstanding substantive features and significant progress compared to the prior art. Specifically, the present invention provides an online detection device for the operation status of a cable, which can monitor the operation temperature and insulation status of the cable in real time, and issue an alarm in time when a fault occurs, so as to fully ensure the safety of the cable operation. During the operation of the cable, if the temperature data measured by the temperature detection module is greater than the set value T0, or / and the low-frequency current signal measured by the insulation detection module is greater than the set value I0, the background monitoring system sends an opening instruction to the alarm module, and the alarm module starts to issue an alarm; otherwise, the background monitoring system sends a closing instruction to the alarm module, and the alarm module starts to remain closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the principle of the present invention. DETAILED DESCRIPTION

[0015] The technical solution of the present invention is further described in detail below through specific implementation methods.

[0016] like Figure 1 As shown, an online detection device for cable operation status includes a temperature detection module, an insulation detection module, a data acquisition module, an alarm module and a background monitoring system; specifically, the background monitoring system mainly refers to the system software that uses computers and networks to monitor the cable operation status in real time, mainly including identity authentication, data initialization, data management, online detection management, historical data management, system maintenance management and system help; the alarm module includes an alarm.

[0017] The temperature detection module includes several temperature sensor units, and several temperature measurement points are evenly distributed according to the cable length; the insulation detection module includes a low-frequency power supply, which is connected to the power grid through a three-phase reactor and grounded through ground capacitance and insulation resistance to form a low-frequency current loop; The data acquisition module is used for the collection, processing and transmission of temperature parameters and low-frequency current parameters; the background monitoring system receives temperature parameters and low-frequency current parameters, makes a judgment on the cable operation status, and issues instructions to the alarm module based on the judgment results.

[0018] In one embodiment, the temperature sensor unit has a temperature measurement range of -20-200°C, a single temperature measurement time of each temperature measurement point is 10-20 s, the temperature sensor unit is integrated with the cable, and the temperature sensor unit is connected via a bus M-BUS to transmit temperature data to the data acquisition module. Specifically, M-BUS is a European instrument bus standard.

[0019] In one embodiment, the temperature sensor unit includes a digital temperature sensor, a single chip control system and an M-BUS bus interface.

[0020] In one embodiment, the injection frequency of the insulation detection module is 5-20 Hz to avoid interference of the grid-to-ground capacitance. Preferably, the injection frequency of the insulation detection module is 10 Hz.

[0021] In one of the embodiments, a method for determining the operating status of a cable is that if the temperature data measured by the temperature detection module is greater than a set value T0, or / and the low-frequency current signal measured by the insulation detection module is greater than a set value I0, the background monitoring system sends an on command to the alarm module, and the alarm module starts to sound an alarm; otherwise, the background monitoring system sends a off command to the alarm module, and the alarm module starts to remain off.

[0022] The above embodiments can be combined with each other.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A cable running status online detection device, characterized in that: Including temperature detection module, insulation detection module, data acquisition module, alarm module and background monitoring system; The temperature detection module includes several temperature sensor units, and several temperature measurement points are evenly distributed according to the cable length; the insulation detection module includes a low-frequency power supply, which is connected to the power grid through a three-phase reactor and grounded through ground capacitance and insulation resistance to form a low-frequency current loop; The data acquisition module is used for the collection, processing and transmission of temperature parameters and low-frequency current parameters; the background monitoring system receives temperature parameters and low-frequency current parameters, makes a judgment on the cable operation status, and issues instructions to the alarm module based on the judgment results.

2. The cable operation status online detection device according to claim 1 is characterized in that: The temperature measurement range of the temperature sensor unit is -20-200℃, the single temperature measurement time of each temperature measurement point is 10-20 s, the temperature sensor unit is integrated with the cable, and the temperature sensor unit is connected through the bus M-BUS to transmit the temperature data to the data acquisition module.

3. The cable running status online detection device according to claim 2 is characterized in that: The temperature sensor unit includes a digital temperature sensor, a single-chip microcomputer control system and an M-BUS bus interface.

4. The cable running status online detection device according to claim 3 is characterized in that: The injection frequency of the insulation detection module is 5-20 Hz.

5. The cable running status online detection device according to claim 4 is characterized in that: The method for judging the cable running status is that the temperature data measured by the temperature detection module is greater than the set value T 0, If the low-frequency current signal measured by the insulation detection module is greater than the set value I0, the background monitoring system sends an open command to the alarm module, and the alarm module starts to sound an alarm; otherwise, the background monitoring system sends a close command to the alarm module, and the alarm module starts to remain closed.

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