CN113030782A - Secondary cable shielding layer grounding state monitoring device and system - Google Patents
Secondary cable shielding layer grounding state monitoring device and system Download PDFInfo
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- CN113030782A CN113030782A CN202110423888.XA CN202110423888A CN113030782A CN 113030782 A CN113030782 A CN 113030782A CN 202110423888 A CN202110423888 A CN 202110423888A CN 113030782 A CN113030782 A CN 113030782A
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Abstract
The embodiment of the invention discloses a secondary cable shielding layer grounding state monitoring device and a system, wherein the secondary cable shielding layer grounding state monitoring device comprises: the adjusting module is used for adjusting the monitoring parameter threshold; the alternating current module is provided with a monitoring terminal, and the monitoring terminal is used for connecting the secondary cable shielding layer and monitoring an electric signal of the secondary cable shielding layer; the control module is electrically connected with the adjusting module and the alternating current module and used for receiving the electric signal sent by the alternating current module and generating an alarm signal when the value of the electric signal is determined to be greater than the monitoring parameter threshold value according to the monitoring parameter threshold value; and the alarm module comprises a first alarm connecting point which is electrically connected with the control module and is used for receiving the alarm signal sent by the control module and closing and triggering alarm when receiving the alarm signal. The device and the system for monitoring the grounding state of the secondary cable shielding layer provided by the embodiment of the invention can improve the reliability of monitoring the grounding state of the secondary cable shielding layer.
Description
Technical Field
The embodiment of the invention relates to a grounding monitoring technology, in particular to a device and a system for monitoring the grounding state of a secondary cable shielding layer.
Background
With the expansion of the scale of the power grid, the number of transformer substations is gradually increased, and a large amount of secondary cable laying, stripping and grounding work is involved in the construction process. In order to realize good anti-interference measures of the secondary cable, a current, voltage and signal contact leading-in wire, a protection and control secondary circuit for microcomputer protection adopts a shielding cable, for the secondary cable with a single shielding layer, two ends of the shielding layer are grounded, for the secondary cable with double shielding layers, two ends of an outer shielding layer are grounded, and an inner shielding layer is grounded at one point indoors. The grounding points are all reliably connected to the secondary grounding copper bar network for grounding, and meanwhile, the grounding state of the cable shielding layer needs to be reliably monitored.
At present, the existing monitoring mode for the grounding state of the secondary cable shielding layer generally needs manual assistance, and workers or acceptance personnel cannot complete or even lack the acceptance method for the grounding quality of the shielding layer, so that the problems of large workload, low efficiency and the like exist, automatic monitoring cannot be realized, and the reliability of monitoring the grounding state of the cable shielding layer is influenced.
Disclosure of Invention
The embodiment of the invention provides a grounding state monitoring device and system for a secondary cable shielding layer, which are used for improving the reliability of grounding state monitoring of the secondary cable shielding layer.
In a first aspect, an embodiment of the present invention provides a device for monitoring a grounding state of a shielding layer of a secondary cable, including:
the adjusting module is used for adjusting the monitoring parameter threshold;
the alternating current module is provided with a monitoring terminal, and the monitoring terminal is used for connecting the secondary cable shielding layer and monitoring an electric signal of the secondary cable shielding layer;
the control module is electrically connected with the adjusting module and the alternating current module and used for receiving the electric signal sent by the alternating current module and generating an alarm signal when the value of the electric signal is determined to be greater than the monitoring parameter threshold value according to the monitoring parameter threshold value;
and the alarm module comprises a first alarm connecting point which is electrically connected with the control module and is used for receiving the alarm signal sent by the control module and closing and triggering alarm when receiving the alarm signal.
Optionally, the monitoring parameter threshold includes a voltage threshold and a current threshold of the secondary cable shielding layer, and the electrical signal includes a voltage and a ground circulating current;
the number of the monitoring terminals is multiple, and the alternating current module comprises a current acquisition unit and a plurality of voltage acquisition units; the current acquisition unit is electrically connected with one monitoring terminal and is used for acquiring the grounding circulation of the secondary cable shielding layer; a plurality of voltage acquisition units are connected with a plurality of monitoring terminal one-to-one electricity, and voltage acquisition module is used for gathering secondary cable shielding layer's voltage.
Optionally, the method further includes:
the overvoltage indicator lamp is electrically connected with the control module, and the control module is used for controlling the overvoltage indicator lamp to be turned on when the voltage is greater than the voltage threshold;
and the control module is used for controlling the overcurrent indicating lamp to be lightened when the grounding circulating current is greater than the current threshold value.
Optionally, the secondary cable shielding layer is electrically connected with the ground copper bar, the ground copper bar is electrically connected with the secondary ground grid, and the current collection unit is used for collecting current between the ground copper bar and the secondary ground grid.
Optionally, the secondary cable shielding layer includes two shielding layers, and the voltage acquisition unit is electrically connected with the outer shielding layer.
Optionally, the first warning contact includes a switch, a control end of the switch is electrically connected to the control module, a first end of the switch is electrically connected to the power supply, and a second end of the switch is electrically connected to the warning device.
Optionally, the alarm module further includes a second alarm contact electrically connected to the control module, and the control module is configured to control the second alarm contact to be closed when the device is not operating normally.
Optionally, the device further comprises an operation state indicator light, the operation state indicator light is electrically connected with the control module, and the control module is used for controlling the operation state indicator light to be turned on when the device operates normally.
In a second aspect, an embodiment of the present invention further provides a system for monitoring the grounding state of a secondary cable shielding layer, including an upper computer and a plurality of devices for monitoring the grounding state of the secondary cable shielding layer according to the first aspect, where the devices for monitoring the grounding state of the secondary cable shielding layer are in communication connection with the upper computer.
Optionally, the host computer includes monitoring host and protocol converter, and secondary cable shielding layer ground state monitoring devices passes through protocol converter and monitoring host communication connection.
The device and the system for monitoring the grounding state of the shielding layer of the secondary cable comprise an adjusting module, an alternating current module, a control module and an alarm module, wherein the adjusting module is used for adjusting a monitoring parameter threshold; the alternating current module is provided with a monitoring terminal, and the monitoring terminal is used for connecting the secondary cable shielding layer and monitoring an electric signal of the secondary cable shielding layer; the control module is electrically connected with the adjusting module and the alternating current module and is used for receiving the electric signal sent by the alternating current module and generating an alarm signal when the value of the electric signal is determined to be greater than the monitoring parameter threshold value according to the monitoring parameter threshold value; the alarm module comprises a first alarm connecting point which is electrically connected with the control module and is used for receiving an alarm signal sent by the control module and closing and triggering an alarm when receiving the alarm signal. Compared with the existing monitoring mode needing manual assistance, the secondary cable shielding layer grounding state monitoring device and system provided by the embodiment have the advantages that the control module receives an electric signal sent by the alternating current module, and according to the monitoring parameter threshold, an alarm signal is generated when the value of the electric signal is determined to be larger than the monitoring parameter threshold, the first alarm contact receives the alarm signal sent by the control module, and the alarm is closed and triggered when the alarm signal is received, so that the possible problem of the grounding state of the secondary cable shielding layer is prompted, the automatic monitoring of the grounding state of the secondary cable shielding layer is realized, the manual assistance is not needed, and the reliability of the monitoring of the grounding state of the secondary cable shielding layer is improved.
Drawings
Fig. 1 is a block diagram of a ground state monitoring device of a secondary cable shielding layer according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a secondary cable shielding layer ground state monitoring device according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a panel according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a system for monitoring grounding states of shielding layers of a secondary cable according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a block diagram of a grounding state monitoring device for a secondary cable shielding layer according to an embodiment of the present invention, where the embodiment is applicable to monitoring a grounding state of a secondary cable shielding layer, and the grounding state monitoring device for a secondary cable shielding layer includes: the device comprises an adjusting module 10, an alternating current module 20, a control module 30 and an alarm module 40.
The adjusting module 10 is configured to adjust a monitoring parameter threshold; the alternating current module 20 is provided with a monitoring terminal 21, and the monitoring terminal 21 is used for connecting a secondary cable shielding layer and monitoring an electric signal of the secondary cable shielding layer; the control module 30 is electrically connected with the adjusting module 10 and the alternating current module 20, and is configured to receive the electrical signal sent by the alternating current module 20, and generate an alarm signal when determining that the value of the electrical signal is greater than the monitoring parameter threshold according to the monitoring parameter threshold; the alarm module 40 includes a first alarm contact 41, the first alarm contact 41 is electrically connected to the control module 30, and the first alarm contact 41 is configured to receive an alarm signal sent by the control module 30 and close and trigger an alarm when receiving the alarm signal.
In particular, the monitoring parameter threshold may comprise a voltage threshold of the secondary cable shielding layer. When the grounding state of the secondary cable shielding layer needs to be monitored by using the secondary cable shielding layer grounding state monitoring device, the monitoring terminal 21 arranged on the alternating current module 20 can be connected to the secondary cable shielding layer, the monitoring terminal 21 monitors the electric signal of the secondary cable shielding layer, such as a voltage signal, the alternating current module 20 can transmit the electric signal monitored by the monitoring terminal 21 to the control module 30, and the adjusting module 10 can transmit the adjusted monitoring parameter threshold value to the control module 30. The control module 30 may determine that an alarm signal is generated when the value of the electrical signal is greater than the monitoring parameter threshold according to the monitoring parameter threshold, and send the generated alarm signal to the first alarm contact 41 of the alarm module 40, and the first alarm contact 41 is closed and triggers an alarm when receiving the alarm signal, thereby achieving the purpose of prompting that the value of the electrical signal of the secondary cable shielding layer is too high and the grounding state of the secondary cable shielding layer is possibly abnormal, i.e. monitoring the grounding state of the secondary cable shielding layer is achieved, and thus timely reminding corresponding staff when the grounding state of the secondary cable shielding layer is abnormal, so that the staff can take measures in time.
The device for monitoring the grounding state of the secondary cable shielding layer comprises an adjusting module, an alternating current module, a control module and an alarm module, wherein the adjusting module is used for adjusting a monitoring parameter threshold; the alternating current module is provided with a monitoring terminal, and the monitoring terminal is used for connecting the secondary cable shielding layer and monitoring an electric signal of the secondary cable shielding layer; the control module is electrically connected with the adjusting module and the alternating current module and is used for receiving the electric signal sent by the alternating current module and generating an alarm signal when the value of the electric signal is determined to be greater than the monitoring parameter threshold value according to the monitoring parameter threshold value; the alarm module comprises a first alarm connecting point which is electrically connected with the control module and is used for receiving an alarm signal sent by the control module and closing and triggering an alarm when receiving the alarm signal. Compared with the existing monitoring mode needing manual assistance, the secondary cable shielding layer grounding state monitoring device provided by the embodiment has the advantages that the control module receives an electric signal sent by the alternating current module, and generates an alarm signal when the value of the electric signal is determined to be greater than the monitoring parameter threshold according to the monitoring parameter threshold, the first alarm contact receives the alarm signal sent by the control module, and the alarm contact is closed and triggers to alarm when the alarm signal is received, so that the possible problem of the grounding state of the secondary cable shielding layer is prompted, the automatic monitoring of the grounding state of the secondary cable shielding layer is realized, manual assistance is not needed, and the reliability of the grounding state monitoring of the secondary cable shielding layer is improved.
Example two
Fig. 2 is a schematic structural diagram of a secondary cable shielding layer ground state monitoring apparatus according to a second embodiment of the present invention, where this embodiment is based on the first embodiment, optionally, the monitoring parameter threshold includes a voltage threshold and a current threshold of the secondary cable shielding layer, and the electrical signal includes voltage and ground circulating current; the number of the monitoring terminals 21 is multiple, and the alternating current module 20 comprises a current acquisition unit 22 and a plurality of voltage acquisition units 23; the current acquisition unit 22 is electrically connected with one monitoring terminal 21, and the current acquisition unit 21 is used for acquiring the grounding circulation of the secondary cable shielding layer; the plurality of voltage acquisition units 23 are electrically connected to the plurality of monitoring terminals 21 in a one-to-one correspondence, and the voltage acquisition module 23 is configured to acquire the voltage of the secondary cable shielding layer 100.
Wherein, a monitoring terminal 21 can be connected with the shielding layer of a secondary cable, and a plurality of monitoring terminals 21 can monitor the shielding layer of a plurality of secondary cables, and a plurality of voltage acquisition units 23 can acquire the voltage of the shielding layer of a plurality of secondary cables to monitor the grounding state of the shielding layer 100 of a plurality of secondary cables. The current collection unit 21 may transmit the collected ground circulating current of the secondary cable shielding layer 100 to the control module 30, and the voltage collection module 23 may transmit the collected voltage of the secondary cable shielding layer 100 to the control module 30. The control module 30 determines that the grounding loop current is greater than the current threshold and/or the voltage is greater than the voltage threshold according to the voltage threshold and the current threshold, and generates an alarm signal, so that the monitoring of the grounding state of the secondary cable shielding layer 100 can be realized according to the grounding loop current and the voltage of the secondary cable shielding layer 100.
Optionally, the apparatus further includes an overvoltage indicator lamp 50 and an overcurrent indicator lamp 60, the overvoltage indicator lamp 50 is electrically connected to the control module 30, and the control module 30 is configured to control the overvoltage indicator lamp 50 to be turned on when the voltage is greater than the voltage threshold; the over-current indicator lamp 60 is electrically connected with the control module 30, and the control module 30 is configured to control the over-current indicator lamp 60 to light up when the ground circulating current is greater than the current threshold.
Specifically, when the control module 30 determines that the voltage of the secondary cable shielding layer 100 is greater than the voltage threshold according to the voltage threshold of the secondary cable shielding layer 100, the overvoltage indicator 50 is controlled to be turned on to indicate that the voltage of the secondary cable shielding layer 100 is overvoltage. When the control module 30 determines that the grounding loop current of the secondary cable shielding layer 100 is greater than the current threshold value according to the current threshold value, the overcurrent indicator lamp 60 is controlled to be turned on to indicate that the grounding loop current of the secondary cable shielding layer 100 is too large.
Optionally, the secondary cable shielding layer 100 is electrically connected to the ground copper bar 200, the ground copper bar 200 is electrically connected to the secondary ground grid 300, and the current collecting unit 22 is configured to collect a current between the ground copper bar 200 and the secondary ground grid 300.
The current between the ground copper bar 200 and the secondary ground grid 300 is the ground circulation of the secondary cable shielding layer 100, one ground copper bar 200 is connected with the shielding layers of the plurality of secondary cables, the ground circulation of the shielding layers of the plurality of secondary cables connected with the ground copper bar 200 is the current between the ground copper bar 200 and the secondary ground grid 300, and the current between the ground copper bar 200 and the secondary ground grid 300 collected by the current collection unit 22 is the ground circulation of the shielding layers of the plurality of secondary cables connected with the ground copper bar 200. In this way, each secondary cable connected to the ground copper bar 200 is prevented from being electrically connected to the current collection unit 22, so that current collection is simpler and more convenient.
Optionally, the secondary cable shielding layer 100 includes two shielding layers, and the voltage collecting unit 23 is electrically connected to the outer shielding layer.
The secondary cable shielding layer 100 includes an outer shielding layer and an inner shielding layer, the voltage collecting unit 23 is electrically connected to the outer shielding layer, and the voltage collecting unit 23 collects voltage of the outer shielding layer. For the secondary cable with double shielding layers, two ends of the outer shielding layer are grounded, the inner shielding layer is preferably grounded at one point indoors, and compared with the secondary cable with a single shielding layer, the secondary cable with double shielding layers has a better shielding effect.
Optionally, the first alarm contact 41 includes a switch 42, a control terminal of the switch 42 is electrically connected to the control module 30, a first terminal of the switch 42 is electrically connected to the power source 70, and a second terminal of the switch 42 is electrically connected to the alarm 80.
Specifically, the control module 30 may control the on/off of the switch 42, for example, the control module 30 generates an alarm signal, when the alarm signal is transmitted to the switch 42, the switch 42 is turned on, and after the switch 42 is turned on, the power supply 70 and the alarm 80 are connected to trigger the alarm 80 to give an alarm, for example, the alarm 80 sends a buzzer sound or a voice prompt sound that the grounding state is abnormal, so as to prompt the related personnel that the grounding state of the secondary cable shielding layer 100 is abnormal.
Optionally, the alarm module 40 further includes a second alarm contact 43, the second alarm contact 43 is electrically connected to the control module 30, and the control module 30 is configured to control the second alarm contact 43 to close when the apparatus is not operating normally.
Specifically, control module 30 can monitor the running state of secondary cable shielding layer ground state monitoring devices, and control module 30 controls the second to report an emergency and ask for help or increased vigilance contact 43 closure and trigger and report an emergency and ask for help or increased vigilance when the device is in abnormal operation to the suggestion staff device is in abnormal operation state, and the staff of being convenient for in time takes corresponding measure to secondary cable shielding layer ground state monitoring devices.
Optionally, the apparatus further includes an operation status indicator lamp 81, the operation status indicator lamp 81 is electrically connected to the control module 30, and the control module 30 is configured to control the operation status indicator lamp 81 to be turned on when the apparatus operates normally.
Specifically, control module 30 can monitor the running state of secondary cable shielding layer ground state monitoring devices, and control module 30 is when the device normal operating, and steerable running state pilot lamp 81 lights to the suggestion device is in normal operating state, and the running state of secondary cable shielding layer ground state monitoring devices is known directly perceivedly to the corresponding personnel of being convenient for.
In an implementation manner, the secondary cable shielding layer ground state monitoring device further includes a panel 90, fig. 3 is a schematic structural diagram of a panel provided in the second embodiment of the present invention, and with reference to fig. 2 and fig. 3, exemplarily, a key 91 and a display module 92 are disposed on the panel 90, the key 91 is electrically connected to the adjustment module 10, the display module 92 is electrically connected to the control module 30, and the overvoltage indicator lamp 50, the overcurrent indicator lamp 60, and the operation state indicator lamp 81 are disposed on the panel. The control module 30 may send the received voltage, the ground circulation current and the monitoring parameter threshold to the display module 92, and the display module 92 displays each data sent by the control module 30, so that related personnel can visually observe the data through the display module 92. In addition, the device also comprises a 485 communication module, a power panel, a control panel, an alternating current panel 1 and an alternating current panel 2 (not shown in the figure), if the power supply 70 is electrically connected with the switch 42, the control module 30 and the like through terminals on the power panel, the power supply can output +5V and + -12V voltage to an internal DC/DC converter (not shown in the figure) through an anti-interference box of the power supply module 70 and a backboard power switch. The control module 30 is electrically connected to other modules through terminals on the control board, the monitoring terminals 21 are terminals of the ac board 1 and/or terminals of the ac board 2, and if the number of voltage collecting terminals on one ac board does not reach the number of secondary cables to be monitored when the ground state of the shielding layers of a plurality of secondary cables needs to be monitored, the terminals on two ac boards are required to be electrically connected to the shielding layers 100 of the secondary cables as the monitoring terminals 21. The arrangement of the terminals is shown in the following table.
TABLE 1 terminal arrangement table
The terminal 301 of the ac board 1 is used as the monitoring terminal 21, and can monitor the ground circulating current I of the secondary cable shielding layer 100, the terminals 303 and 312 and the terminals 401 and 413 are used as the monitoring terminals 21, and can monitor the potentials U1-U24 of the 24 secondary cable shielding layers 100. The current collecting unit 22 can monitor the grounding circulation of the secondary cable shielding layer by collecting the current of the current transformer 210 installed on the grounding line between the grounding copper bar 200 and the secondary grounding grid 300, and the voltage collecting unit 23 can monitor the potential of the secondary cable shielding layer 100 by connecting the monitoring terminal 21 of the shielding layer of the secondary cable.
The secondary cable shielding layer grounding state monitoring device provided by the embodiment comprises an adjusting module, an alternating current module, a control module, an alarm module, an overvoltage indicator lamp, an overcurrent indicator lamp and a running state indicator lamp, wherein when the control module determines that the voltage of the secondary cable shielding layer is greater than a voltage threshold value, the overvoltage indicator lamp is controlled to be turned on, when the grounding circulating current of the secondary cable shielding layer is determined to be greater than a current threshold value, the overcurrent indicator lamp is controlled to be turned on, and when the device runs normally, the running state indicator lamp is controlled to be turned on. Compared with the existing monitoring mode needing manual assistance, in the ground state monitoring device for the secondary cable shielding layer provided by the embodiment, the control module receives an electric signal sent by the alternating current module, and generates an alarm signal when the value of the electric signal is determined to be greater than the monitoring parameter threshold according to the monitoring parameter threshold, the first alarm contact receives the alarm signal sent by the control module, and closes and triggers an alarm when the alarm signal is received, so that the ground state of the secondary cable shielding layer is prompted to have problems, therefore, the automatic monitoring of the ground state of the secondary cable shielding layer is realized, the manual assistance is not needed, and the ground state monitoring reliability of the secondary cable shielding layer is improved; and the overvoltage indicator lamp is lightened, so that the overvoltage indicator lamp can prompt that the voltage of the secondary cable shielding layer is overvoltage, the overcurrent indicator lamp is lightened, the overlarge grounding circulation of the secondary cable shielding layer can be prompted, the running state indicator lamp is lightened, the device can be prompted to be in a normal running state, and corresponding personnel can conveniently and visually know the running state of the device.
EXAMPLE III
Fig. 4 is a schematic structural diagram of a system for monitoring a grounding state of a shielding layer of a secondary cable according to a third embodiment of the present invention, where the system for monitoring a grounding state of a shielding layer of a secondary cable includes: the monitoring device comprises an upper computer 400 and a plurality of secondary cable shielding layer grounding state monitoring devices 500 according to any embodiment of the invention, wherein the secondary cable shielding layer grounding state monitoring devices 500 are in communication connection with the upper computer 400.
Wherein, secondary cable shield layer ground state monitoring devices 500 can include communication module, and communication module is connected with the control module electricity, and communication module accessible communication bus is like 485 communication bus and host computer 400 communication connection, and secondary cable shield layer ground state monitoring devices 500's control module accessible communication module sends monitoring parameter threshold value and the signal of telecommunication of monitoring etc. to host computer 400, and host computer 400 can monitor the data of receiving.
Optionally, the upper computer 400 includes a monitoring host 410 and a protocol converter 420, and the secondary cable shielding layer ground state monitoring apparatus 500 is in communication connection with the monitoring host 410 through the protocol converter 420.
The protocol converter 420 is mainly used in various automatic network communication occasions to convert communication protocols. Protocol converter 420 can convert the communication protocol of secondary cable shielding layer ground state monitoring devices 500 into the communication protocol that monitoring host 410 can discern, and prior art can be referred to protocol converter 420's specific working process, and no longer repeated here. The monitoring host 410 receives and recognizes the data sent by the secondary cable shielding layer ground state monitoring device 500 through the protocol converter 420 to monitor the received data.
The system for monitoring the grounding state of the secondary cable shielding layer provided by the embodiment of the invention and the device for monitoring the grounding state of the secondary cable shielding layer provided by any embodiment of the invention belong to the same inventive concept, and have corresponding beneficial effects, and detailed technical details in the embodiment are not shown in the device for monitoring the grounding state of the secondary cable shielding layer provided by any embodiment of the invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A secondary cable shielding layer ground connection state monitoring device, its characterized in that includes:
the adjusting module is used for adjusting the monitoring parameter threshold;
the alternating current module is provided with a monitoring terminal, and the monitoring terminal is used for connecting the secondary cable shielding layer and monitoring an electric signal of the secondary cable shielding layer;
the control module is electrically connected with the adjusting module and the alternating current module and used for receiving the electric signal sent by the alternating current module and generating an alarm signal when the value of the electric signal is determined to be greater than the monitoring parameter threshold value according to the monitoring parameter threshold value;
and the alarm module comprises a first alarm connecting point, the first alarm connecting point is electrically connected with the control module, and the first alarm connecting point is used for receiving the alarm signal sent by the control module and closing and triggering an alarm when receiving the alarm signal.
2. The secondary cable shield ground state monitoring device of claim 1, wherein the monitoring parameter threshold comprises a voltage threshold and a current threshold of the secondary cable shield, the electrical signal comprises voltage and ground circulating current;
the number of the monitoring terminals is multiple, and the alternating current module comprises a current acquisition unit and a plurality of voltage acquisition units; the current acquisition unit is electrically connected with one monitoring terminal and is used for acquiring the grounding circulation of the secondary cable shielding layer; the voltage acquisition units are electrically connected with the monitoring terminals in a one-to-one correspondence mode, and the voltage acquisition module is used for acquiring the voltage of the secondary cable shielding layer.
3. The secondary cable shielding layer ground state monitoring device according to claim 2, further comprising:
the overvoltage indicator lamp is electrically connected with the control module, and the control module is used for controlling the overvoltage indicator lamp to be turned on when the voltage is greater than the voltage threshold value;
the overcurrent indicating lamp is electrically connected with the control module, and the control module is used for controlling the overcurrent indicating lamp to be lightened when the grounding circulating current is greater than the current threshold value.
4. The device for monitoring the grounding state of the secondary cable shielding layer according to claim 2, wherein the secondary cable shielding layer is electrically connected with a grounding copper bar, the grounding copper bar is electrically connected with a secondary grounding grid, and the current collecting unit is used for collecting the current between the grounding copper bar and the secondary grounding grid.
5. The secondary cable shielding layer ground state monitoring device according to claim 2, wherein the secondary cable shielding layer comprises two shielding layers, and the voltage acquisition unit is electrically connected with the outer shielding layer.
6. The secondary cable shield ground state monitoring device of claim 1, wherein the first alarm contact comprises a switch, a control terminal of the switch is electrically connected to the control module, a first terminal of the switch is electrically connected to a power source, and a second terminal of the switch is electrically connected to an alarm.
7. The device for monitoring the grounding state of the secondary cable shielding layer according to claim 1, wherein the alarm module further comprises a second alarm contact, the second alarm contact is electrically connected with the control module, and the control module is used for controlling the second alarm contact to be closed when the device is in abnormal operation.
8. The device for monitoring the grounding state of the secondary cable shielding layer according to claim 1, further comprising an operation state indicator lamp electrically connected with the control module, wherein the control module is used for controlling the operation state indicator lamp to be turned on when the device is in normal operation.
9. A secondary cable shielding layer grounding state monitoring system is characterized by comprising an upper computer and a plurality of secondary cable shielding layer grounding state monitoring devices according to any one of claims 1 to 8, wherein the secondary cable shielding layer grounding state monitoring devices are in communication connection with the upper computer.
10. The system for monitoring the grounding state of the secondary cable shielding layer according to claim 9, wherein the host computer comprises a monitoring host and a protocol converter, and the device for monitoring the grounding state of the secondary cable shielding layer is in communication connection with the monitoring host through the protocol converter.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115267309A (en) * | 2022-06-24 | 2022-11-01 | 新疆协鑫新能源材料科技有限公司 | Cable metal shielding layer voltage background monitoring system |
| CN116125330A (en) * | 2022-11-21 | 2023-05-16 | 国网江苏省电力有限公司南京供电分公司 | Grounding wire current monitoring and early warning method and system for armored shielding secondary cable |
| CN116626363A (en) * | 2023-07-20 | 2023-08-22 | 国网江苏省电力有限公司南京供电分公司 | Method and device for monitoring grounding wire current of armored shielding cable in strong electromagnetic environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115267309A (en) * | 2022-06-24 | 2022-11-01 | 新疆协鑫新能源材料科技有限公司 | Cable metal shielding layer voltage background monitoring system |
| CN116125330A (en) * | 2022-11-21 | 2023-05-16 | 国网江苏省电力有限公司南京供电分公司 | Grounding wire current monitoring and early warning method and system for armored shielding secondary cable |
| CN116626363A (en) * | 2023-07-20 | 2023-08-22 | 国网江苏省电力有限公司南京供电分公司 | Method and device for monitoring grounding wire current of armored shielding cable in strong electromagnetic environment |
| CN116626363B (en) * | 2023-07-20 | 2023-11-17 | 国网江苏省电力有限公司南京供电分公司 | Method and device for monitoring grounding wire current of armored shielding cable in strong electromagnetic environment |
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