CN214750659U - Whole machine insulation monitoring device for port crane - Google Patents
Whole machine insulation monitoring device for port crane Download PDFInfo
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- CN214750659U CN214750659U CN202120167999.4U CN202120167999U CN214750659U CN 214750659 U CN214750659 U CN 214750659U CN 202120167999 U CN202120167999 U CN 202120167999U CN 214750659 U CN214750659 U CN 214750659U
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Abstract
The utility model belongs to the technical field of insulation monitoring, a complete machine insulation monitoring device for port crane is disclosed for to port crane, for example bank bridge, tyre crane, rail crane, door machine, stacker-reclaimer, shipment machine, the on-line monitoring of the high-low voltage insulation state of equipment such as ship unloaders. The main control cabinet is connected with a plurality of low-voltage insulation monitoring points through connecting lines, the high-voltage insulation monitoring device is provided with a cable trench monitoring cabinet, a slip ring monitoring switching cabinet and a transformer monitoring cabinet, the cable trench monitoring cabinet is installed in a cable pit, the slip ring monitoring cabinet and the slip ring monitoring switching cabinet are installed on a slip ring box platform, and the transformer monitoring cabinet is installed in a transformer room. The utility model discloses combine low pressure insulation monitoring function and high-voltage insulation monitoring function, lead to and fix a position the insulation fault point rapidly before equipment component insulation damages even damages, change before equipment trouble or burnout, accidents such as shut down, electric fire, bodily injury that avoid insulation fault to cause.
Description
Technical Field
The utility model belongs to the technical field of insulation monitoring, especially, relate to an insulating monitoring device of complete machine for port crane.
Background
In the port industry, the hidden danger of electrical accidents mainly comprises: electric shock accidents, electrical fires, lightning accidents, fault outages. The electric shock accident can cause serious personal injury, the electric fire can cause serious equipment damage, and the two can be caused by insulation faults to a great extent under the condition of non-illegal operation.
In the insulation structure of high voltage power cables, air gaps and harmful impurities are often present due to difficulties in processing or impurities in raw materials, or gaps are present between the insulation and the semiconductive shield or the semiconductive body protrudes towards the insulation layer due to process reasons, and Partial Discharges (PD) are highly likely to occur at the tips of these air gaps and impurities, while various insulation defects may also occur during installation and operation of the power cable, resulting in partial discharges.
The high-voltage power cable joint is a weak link in a power cable system and is easy to break down. Therefore, the method has important significance for monitoring the local discharge of the cable joint on site and realizing the safe operation of a power system. If partial discharge exists for a long time, insulation deterioration and even breakdown can be caused under certain conditions. The crane equipment is monitored by partial discharge, so that the insulation condition of the equipment can be known, a plurality of problems related to manufacturing and installation can be found in time, and the reason and the severity of the insulation fault can be determined.
At present, in the actual maintenance of a port crane, the monitoring of the insulation state still stays on the off-line detection level of the equipment for inspection by using handheld equipment after the equipment is stopped. And the online insulation monitoring device in the market is not suitable for the working condition of the port crane.
When the cable is aged or damaged, discharge current is generated, the current tends to increase along with time, a human body can sense the current at 10mA, personal injury can be caused at 30mA, and an electrical fire can be possibly caused at 100 mA. Early minute discharge currents do not cause significant failure, but left alone will eventually lead to an electric shock accident or an electrical fire.
Even if no serious accident is caused, the insulation fault can cause the equipment to stop or the power supply is interrupted enough, and the stable state of the normal operation of the equipment is influenced.
Through the above analysis, the problems and defects of the prior art are as follows:
(1) the off-line detection cannot prevent the insulation fault in time, and the maintenance workload is large
(2) On-line insulation detection system not adapted to current port crane equipment working condition
(3) The insulation state of the low-voltage equipment and the high-voltage equipment cannot be managed comprehensively
The difficulty in solving the above problems and defects is:
(1) the port crane has various types of equipment, complicated on-board electrical equipment, multiple key parts and various power supply forms, and the insulation monitoring of the equipment is difficult to integrate.
(2) High voltage insulation detection is different from low voltage insulation detection, and is integrated into a system, so that the detection information is difficult to be integrated together.
(3) The harbour environment is bad, and it is difficult to develop products with environmental suitability.
The significance of solving the problems and the defects is as follows:
the state of the equipment is analyzed through online real-time detection and monitoring of the wires and cables of the whole machine, the insulation state of the electrical equipment and judgment of the insulation value, maintenance suggestions are given in time, maintenance is planned in advance, and the failure rate of the equipment is reduced. Meanwhile, people are prevented from being injured by electric shock, personal safety is guaranteed, and electric fire is prevented.
SUMMERY OF THE UTILITY MODEL
Problem to prior art existence, the utility model provides an insulating monitoring device of complete machine for harbour crane.
The utility model discloses a realize like this, an insulating monitoring device of complete machine for harbour crane is provided with:
a low voltage insulation monitoring device and a high voltage insulation monitoring device;
the low-voltage insulation monitoring device is provided with a main control cabinet 5 installed in an electric room 11 as shown in an accessory figure 1, the main control cabinet 5 is connected with a plurality of low-voltage insulation monitoring points 9 through a connecting circuit 14, the high-voltage insulation monitoring device is provided with a cable trench monitoring cabinet 6, a slip ring monitoring cabinet 7 and a transformer monitoring cabinet 8, the cable trench monitoring cabinet 6 is installed in a cable pit 2, the slip ring monitoring cabinet 7 is installed on a slip ring box platform 3, and the transformer monitoring cabinet 8 is installed in a transformer room 4.
Further, the cable trench monitoring cabinet 6, the slip ring monitoring cabinet 7 and the transformer monitoring cabinet 8 are respectively connected with the main control cabinet 5 through a connecting line 13 for data transmission and power supply. A high-frequency current sensor is arranged in the cable trench junction box 10 and is communicated with the cable trench monitoring cabinet 6 through a special cable 15, similarly, a high-frequency current sensor is arranged in the slip ring box 11 and is communicated with the slip ring monitoring cabinet 7 through the special cable 15, and a high-frequency current sensor is arranged in the transformer box 12 and is communicated with the transformer monitoring cabinet 8 through the special cable 15.
Further, the low-voltage insulation detection part in the whole machine insulation monitoring device for the port crane is characterized in that as shown in an accessory figure 2, a phase line and a ground line of a detected device 17 are directly connected into an insulation detection module 20 through a detection cable 14. The contactor 19 and the fuse 18 are connected between the low-voltage insulation monitoring module 20 and the detected device 17, and are used for protecting the electrical safety of the detected loop. The data detected by the low voltage insulation monitoring module 20 is transmitted to the control module 21, and the contactor 19 is controlled by the controller 21.
Further, a high-voltage insulation detection part used in the whole machine insulation monitoring device of the port crane, as shown in an accessory figure 3, a high-frequency current sensor 22 is clamped on an outer layer grounding wire 23 of a detected cable 24, an acquired signal is transmitted back to an acquisition module in a cable trench monitoring cabinet 6 through a sensor special cable 15, the acquisition module is transmitted back to a main control cabinet 5 through a communication optical cable 13 in a coiled cable, only a high-voltage power supply is arranged in a cable trench, and a low-voltage control power supply is inconvenient to lay, so that 2 CT electricity-taking sensors 25 are clamped on the high-voltage cable 24, and electric energy is acquired through the electromagnetic induction principle and stored for use.
As shown in fig. 4, the slip ring monitoring cabinet 7 can be laid with communication and power supply cables, so that cable winding optical fibers and a CT power taking module 25 are not required.
As shown in the attached fig. 5, the transformer is sometimes divided into two devices: a main electrical transformer 12A, and an auxiliary electrical transformer 12B. The transformer monitoring cabinet 8 can be provided with two sets of acquisition modules for simultaneously acquiring monitoring data of two sets of sensors 22.
Combine foretell all technical scheme, the utility model discloses the advantage that possesses and positive effect are:
the utility model discloses combined low pressure insulation monitoring function and high-voltage insulation monitoring function, can fix a position the insulation fault point rapidly before equipment component insulation damages even damages through low pressure insulation monitoring device, change before equipment trouble or burnout, the shut down of avoiding insulation fault to cause.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
Fig. 1 is a schematic structural view of a complete machine insulation monitoring device for a port crane provided by an embodiment of the present invention.
Fig. 2 is a schematic diagram of a circuit connection principle of a low-voltage insulation detection loop of a complete machine insulation monitoring device for a port crane provided by the embodiment of the present invention.
Fig. 3 is a schematic diagram of a circuit connection of the cable pit monitoring cabinet provided by the embodiment of the utility model.
Fig. 4 is a schematic diagram of a circuit connection of the slip ring monitoring cabinet according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a circuit connection of the transformer monitoring cabinet provided by the embodiment of the present invention.
Fig. 6 is a schematic diagram of monitoring high voltage insulation according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of low-voltage insulation monitoring provided by the embodiment of the present invention.
In fig. 1-6: 1. an electric room; 2. a cable pit; 3. a slip ring box platform; 4. a transformer room; 5. a master control cabinet; 6. a cable trench monitoring cabinet; 7. a slip ring monitoring cabinet; 8. a transformer monitoring cabinet; 9. low-voltage insulation monitoring points; 10. a cable trench junction box; 11. a slip ring box; 12. a transformer tank; 12A main electrical transformer; 12B, an auxiliary electric transformer; 13. connecting a line; 14. detecting the cable; 15. a dedicated cable; 16. a first high-frequency current sensor; 17. a device to be tested; 18. a fuse; 19. a contactor; 20. an insulation detection module; 21. a controller; 22. a second high-frequency current sensor; 23. an outer layer ground wire; 24. a detected cable; 25. a CT power taking module; 26. a third high frequency current sensor.
Fig. 7 is a schematic diagram of low-voltage insulation monitoring provided by the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
To the problem that prior art exists, the utility model provides an insulating monitoring device of complete machine for harbour hoist, it is right to combine the figure below the utility model discloses do detailed description.
As shown in the accessory figure 1, the low-voltage insulation monitoring device is provided with a main control cabinet 5 installed in an electric room 11, the main control cabinet 5 is connected with a plurality of low-voltage insulation monitoring points 9 through a connecting line 14, the high-voltage insulation monitoring device is provided with a cable trench monitoring cabinet 6, a slip ring monitoring cabinet 7 and a transformer monitoring cabinet 8, the cable trench monitoring cabinet 6 is installed in a cable pit 2, the slip ring monitoring cabinet 7 is installed on a slip ring box platform 3, and the transformer monitoring cabinet 8 is installed in a transformer room 4.
The whole machine insulation monitoring device for the port crane is characterized in that the cable trench monitoring cabinet 6, the slip ring monitoring cabinet 7 and the transformer monitoring cabinet 8 are respectively connected with the main control cabinet 5 through connecting lines 13 to carry out data transmission and power supply. The cable trench connection box 10 is provided with a third high-frequency current sensor 26 which is communicated with the cable trench monitoring cabinet 6 through a special cable 15, similarly, the slip ring box 11 is provided with a first high-frequency current sensor 16 which is communicated with the slip ring monitoring cabinet 7 through the special cable 15, and the transformer box 12 is provided with a second high-frequency current sensor 22 which is communicated with the transformer monitoring cabinet 8 through the special cable 15.
The low-voltage insulation detection part used in the whole machine insulation monitoring device of the port crane is shown in an accessory figure 2, and phase lines and ground lines of a detected device 17 are directly connected into an insulation detection module 20 through a detection cable 14. The contactor 19 and the fuse 18 are connected between the low-voltage insulation monitoring module 20 and the detected device 17, and are used for protecting the electrical safety of the detected loop. The data detected by the low voltage insulation monitoring module 20 is transmitted to the control module 21, and the contactor 19 is controlled by the controller 21.
The high-voltage insulation detection part used in the whole machine insulation monitoring device of the port crane is characterized in that as shown in an accessory figure 3, a high-frequency current sensor 22 is clamped on an outer layer grounding wire 23 of a detected cable 24, an acquired signal is transmitted back to an acquisition module in a cable trench monitoring cabinet 6 through a special sensor cable 15, the acquisition module is transmitted back to a main control cabinet 5 through a communication optical cable 13 in a coiled cable, only a high-voltage power supply is arranged in a cable trench, and a low-voltage control power supply is inconvenient to lay, so that 2 CT electricity-taking sensors 25 are clamped on the high-voltage cable 24, and electric energy is acquired through the principle of electromagnetic induction and stored for use.
As shown in fig. 4, the slip ring monitoring cabinet 7 can be laid with communication and power supply cables, so that cable winding optical fibers and a CT power taking module 25 are not required.
As shown in the attached fig. 5, the transformer is sometimes divided into two devices: a main electrical transformer 12A, and an auxiliary electrical transformer 12B. The transformer monitoring cabinet 8 can be provided with two sets of acquisition modules for simultaneously acquiring monitoring data of two sets of sensors 22.
The low-voltage insulation monitoring in the low-voltage insulation detection loop is in a contact type for insulation monitoring, in order to ensure the safety of the original loop, a contactor and a fuse are added between the detection module and the detected equipment, and the voltage-resistant grade can reach 1000V. When the system reports 'fuse fault' or 'contactor/relay fault', the hardware equipment of the detection loop corresponding to the monitoring point is checked in sequence.
The utility model discloses a theory of operation is:
the high-voltage insulation detection adopts a method of detecting ultrahigh-frequency pulse current by a high-frequency current sensor to carry out partial discharge measurement. For most high voltage cable devices 24, distributed capacitance exists on the high and low voltage sides or on the ground, and when a discharge occurs in a high field intensity region, the discharge will couple to the ground and enter the ground through the ground line. The high-frequency current sensor is clamped on a grounding wire, a pulse current signal generated by partial discharge of the high-frequency current sensor is monitored, a frequency band is selected and the bandwidth is controlled through a partial discharge monitoring host, an interference signal is removed, and then effective partial discharge information of the detected equipment is obtained after filtering, amplification and analog-to-digital conversion.
The low-voltage insulation detection adopts a low-frequency injection method: a low-frequency alternating current signal is injected between a power grid and a ground pole through the insulation detection module 20, the low-frequency signal can automatically adapt to the sizes of a system leakage capacitor and an insulation resistor, and low-frequency leakage current is measured through the insulation transformer, so that an insulation value is calculated.
The utility model discloses when using, after the start power transmission, at first detect each monitoring point, data acquisition and data analysis through the insulating detection device of low pressure and the insulating detection device of high pressure, finally obtain the insulating state of each point. This trouble can be detected to corresponding monitoring facilities, if certain monitoring point insulating fault takes place, the insulating resistance that its detected is less than a certain value (settlement response value), and insulating monitoring facilities will send an alarm information, and this system can set up tertiary insulating warning: early warning, early warning and alarming.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be covered within the protection scope of the present invention by those skilled in the art within the technical scope of the present invention.
Claims (5)
1. The utility model provides a complete machine insulation monitoring device for harbour hoist which characterized in that, a complete machine insulation monitoring device for harbour hoist is provided with:
a low voltage insulation monitoring device and a high voltage insulation monitoring device;
the low-voltage insulation monitoring device is provided with a main control cabinet installed in an electric room, the main control cabinet is connected with a plurality of low-voltage insulation monitoring points through connecting lines, the high-voltage insulation monitoring device is provided with a cable trench monitoring cabinet, a slip ring monitoring cabinet and a transformer monitoring cabinet, the cable trench monitoring cabinet is installed in a cable pit, the slip ring monitoring cabinet is installed on a slip ring box platform, and the transformer monitoring cabinet is installed in a transformer room.
2. The complete machine insulation monitoring device for the port crane as claimed in claim 1, wherein the cable trench monitoring cabinet, the slip ring monitoring cabinet and the transformer monitoring cabinet are respectively connected with the main control cabinet through connecting lines for data transmission and power supply; the high-frequency current sensor is arranged in the cable trench junction box and communicated with the cable trench monitoring cabinet through a special cable, the high-frequency current sensor is arranged in the slip ring box and communicated with the slip ring monitoring cabinet through a special cable, and the high-frequency current sensor is arranged in the transformer box and communicated with the transformer monitoring cabinet through a special cable.
3. The whole insulation monitoring device for the harbor crane as claimed in claim 1, wherein the low voltage insulation detecting part of the whole insulation monitoring device for the harbor crane directly connects the phase line and the ground line of the detected equipment into the insulation detecting module through the detecting cable; the contactor and the fuse are connected between the low-voltage insulation monitoring module and the detected equipment and are used for protecting the electrical safety of the detected loop; the data transmission that low pressure insulation monitoring module detected to control module, contactor are controlled by the controller.
4. The complete machine insulation monitoring device for the port crane according to claim 1, wherein a high-frequency current sensor is clamped on an outer layer ground wire of a detected cable of the high-voltage insulation detecting part in the complete machine insulation monitoring device for the port crane, the acquired signal is transmitted back to an acquisition module in the cable trench monitoring cabinet through a special cable for the sensor, the acquisition module is transmitted back to the main control cabinet through a communication cable in a coiled cable, a high-voltage power supply is installed in the cable trench, and a CT electricity-taking sensor for obtaining the electric energy through the electromagnetic induction principle is clamped on the high-voltage cable.
5. The complete machine insulation monitoring device for the harbor crane as claimed in claim 1, wherein the transformer comprises a main electric transformer, an auxiliary electric transformer; the transformer monitoring cabinet is provided with two sets of acquisition modules of sensor monitoring data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120167999.4U CN214750659U (en) | 2021-01-21 | 2021-01-21 | Whole machine insulation monitoring device for port crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120167999.4U CN214750659U (en) | 2021-01-21 | 2021-01-21 | Whole machine insulation monitoring device for port crane |
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| Publication Number | Publication Date |
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| CN214750659U true CN214750659U (en) | 2021-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120167999.4U Active CN214750659U (en) | 2021-01-21 | 2021-01-21 | Whole machine insulation monitoring device for port crane |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4431956A1 (en) * | 2023-03-15 | 2024-09-18 | Siemens Aktiengesellschaft | Measurement of a partial discharge of an electrical operating means |
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2021
- 2021-01-21 CN CN202120167999.4U patent/CN214750659U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4431956A1 (en) * | 2023-03-15 | 2024-09-18 | Siemens Aktiengesellschaft | Measurement of a partial discharge of an electrical operating means |
| WO2024189009A1 (en) * | 2023-03-15 | 2024-09-19 | Siemens Aktiengesellschaft | Measurement of a partial discharge of an electrical operating means |
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Effective date of registration: 20221223 Address after: 323300 Longban Mountain Area, Economic Development Zone, Yunfeng Street, Suichang County, Lishui City, Zhejiang Province Patentee after: Zhejiang Zhengao Automobile Technology Co.,Ltd. Address before: 315600 No.221 Beidou North Road, Yuelong street, Ninghai County, Ningbo City, Zhejiang Province Patentee before: Zhengao precision technology (Ningbo) Co.,Ltd. |