CN212808564U - Ring main unit on-line monitoring device - Google Patents
Ring main unit on-line monitoring device Download PDFInfo
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- CN212808564U CN212808564U CN202021099133.6U CN202021099133U CN212808564U CN 212808564 U CN212808564 U CN 212808564U CN 202021099133 U CN202021099133 U CN 202021099133U CN 212808564 U CN212808564 U CN 212808564U
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 19
- 238000012544 monitoring process Methods 0.000 claims abstract description 41
- 238000004891 communication Methods 0.000 claims abstract description 16
- 230000009977 dual effect Effects 0.000 claims abstract description 3
- 238000012423 maintenance Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 5
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- 238000000034 method Methods 0.000 abstract description 6
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- 238000004804 winding Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
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Abstract
本实用新型公开了一种用于智能电网在线监测领域的环网柜在线监测装置，包括依次连接的供电装置、监测仪表和电流采集装置和温度采集装置，测温装置其一端采用接触式绑扎的方式固定在故障率发生较高的电缆肘头处，另一端与监测仪表相连。电流采集装置为三相一体电流互感器，一端采用圆形卡口式结构安装在环网柜电缆接头处，另一端与监测仪表相连。供电装置设计采用内置电源和通过电流互感器取电的双供电结构。监测仪表包括分别与所述监测仪表的主控单元连接的电流指示单元、温度指示单元、开关状态指示单元、故障指示单元、数据记录单元、通讯单元和下载单元。本实用新型能够对环网柜进行在线监测和智能预警。
The utility model discloses an on-line monitoring device for a ring network cabinet used in the field of on-line monitoring of a smart grid, comprising a power supply device, a monitoring instrument, a current acquisition device and a temperature acquisition device which are connected in sequence, and one end of the temperature measuring device adopts a contact-type binding device. The method is fixed at the elbow of the cable where the failure rate is high, and the other end is connected to the monitoring instrument. The current acquisition device is a three-phase integrated current transformer, one end of which is installed at the cable joint of the ring network cabinet with a circular bayonet structure, and the other end is connected to the monitoring instrument. The power supply device is designed with a built-in power supply and a dual power supply structure with current transformers. The monitoring instrument includes a current indicating unit, a temperature indicating unit, a switch state indicating unit, a fault indicating unit, a data recording unit, a communication unit and a downloading unit respectively connected with the main control unit of the monitoring instrument. The utility model can carry out on-line monitoring and intelligent early warning for the ring network cabinet.
Description
Technical Field
The utility model relates to a looped netowrk cabinet on-line monitoring device for smart power grids on-line monitoring field.
Background
The Ring Main Unit (Ring Main Unit) is used as an important power supply device in an urban power distribution network, is widely applied to distribution stations and box-type substations of load centers such as urban residential areas, building commercial areas, large-scale public facilities, enterprise industrial parks and the like, and has very important significance for improving the power supply reliability and the user satisfaction degree of the urban power distribution network in safe and stable operation.
The common ring main unit is an electrical device which is formed by installing a load switch, a high-voltage fuse and other electrical equipment in a metal or nonmetal insulating cabinet body or forming an assembled interval ring main power supply unit. When the ring main unit operates normally, the load switch and the fuse form a combined electrical appliance, and load current, overload current and the like can be cut off. However, in operation, the ring main units can have various faults due to various reasons, so that most of the ring main units are provided with monitoring devices capable of monitoring electrical and non-electrical quantity information such as load current, temperature of important parts, environment temperature and humidity during operation, and the like, and can help workers to perform daily operation maintenance and fault emergency repair analysis to a certain extent.
However, the ring main units in transport at present have the following problems due to different manufacturers and structures: (1) various instruments, sensors and state indicating devices on the instrument room panel have single functions, are disordered in installation and arrangement, and are disorderly wired in the cabinet; (2) the existing monitoring device of the ring main unit cannot realize on-line monitoring and has no pre-alarm function of abnormal operation state, and operation and maintenance personnel cannot find and avoid the fault of the ring main unit at the first time; (3) when the ring main unit breaks down, the operation history state before the failure time point has no statistic and query functions, and the analysis and follow-up prevention of the accident are influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough of prior art, provide a looped netowrk cabinet on-line monitoring device, can carry out on-line monitoring and intelligent early warning to the looped netowrk cabinet.
One technical scheme for achieving the above purpose is as follows: an online monitoring device of a ring main unit comprises a power supply device, a monitor meter and a current collecting device which are connected in sequence;
also comprises a temperature acquisition device, one end of the temperature acquisition device is fixed at the elbow head of the cable with higher failure rate in a contact binding mode, the other end of the temperature acquisition device is connected with a monitoring instrument,
the current collecting device is a three-phase integrated current transformer, one end of the current collecting device is arranged at a cable joint of the ring main unit by adopting a circular bayonet structure, and the other end of the current collecting device is connected with a monitoring instrument;
the power supply device is designed to adopt a dual power supply structure with a built-in power supply and power taking through a current transformer, the current transformer is arranged on a cable of the ring main unit and is used for continuously supplying power to the monitoring instrument, and when the ring main unit is stopped and loses an external power supply, the system jumps to a built-in battery to supply power to the monitoring instrument;
the monitoring instrument comprises a current indicating unit, a temperature indicating unit, a switch state indicating unit, a fault indicating unit, a data recording unit, a communication unit and a downloading unit which are respectively connected with a main control unit of the monitoring instrument.
Further, the fault indication unit comprises a load current abnormity alarm subunit, a short circuit fault alarm subunit, a ground fault alarm subunit and a temperature abnormity alarm subunit.
Furthermore, the communication unit communicates with a distribution network measurement and control terminal (DTU) in an RS485 communication mode, communicates with a host of a remote operation and maintenance monitoring center or communicates with a mobile phone terminal of an operation and maintenance person through a wireless private network or GPRS.
Further, the download unit is externally connected by adopting a USB structure.
The utility model discloses a looped netowrk cabinet on-line monitoring device can carry out integrated monitoring and demonstration to electric and non-electric volume such as load current, fault current, cable joint temperature, environment humiture under the looped netowrk cabinet running state, has functions such as the discernment of running state anomaly and trouble, judgement, warning in advance. The device can record information such as current, temperature and humidity under the operation state of the ring main unit and support local downloading, and meanwhile, a communication interface is reserved in the device, so that remote signaling and remote measuring are realized, advanced and comprehensive technical means are provided for daily operation and fault analysis of the ring main unit, and the operation reliability of the ring main unit is further improved.
Drawings
Fig. 1 is a schematic structural view of an online monitoring device for a ring main unit according to the present invention;
fig. 2 is a schematic structural diagram of a monitoring instrument of the ring main unit online monitoring device of the present invention;
fig. 3 is the utility model discloses a looped netowrk cabinet on-line monitoring device's panel schematic diagram.
Detailed Description
In order to better understand the technical solution of the present invention, the following detailed description is made by specific embodiments:
referring to fig. 1, the utility model discloses a looped netowrk cabinet on-line monitoring device, including power supply unit 1, monitoring instrument 2, current collection device 3 and temperature collection device 4. The current collecting device 3 is designed into a three-phase integrated current transformer, so that the field installation links can be reduced, the skill requirements on field installation workers are reduced, and the safety and reliability are improved. The secondary rated current of the current transformer is 5A, the accuracy level is 0.5, and one end of the current transformer is arranged at the cable joint of the ring main unit by adopting a circular bayonet structure; the other end is connected with a monitoring instrument, so that the monitoring of the load current and the fault current can be realized. The temperature acquisition device 4 adopts a thermocouple sensor with stable performance, wide temperature measurement range and long signal transmission distance, the measurement range is-25 ℃ to 100 ℃, and the accuracy grade is +/-0.1 ℃. One end of the cable elbow is fixed at the cable elbow head with higher failure rate in a contact binding mode, and the other end of the cable elbow head is connected with the monitoring instrument 2, so that the real-time monitoring of the operating temperature of the cable head of the ring main unit can be realized. The power supply device adopts a double power supply mode of a built-in power supply and power taking through a current transformer. The current transformer is installed on a cable of the ring main unit, and the secondary winding adopts a special winding process, so that continuous working current is guaranteed to be provided for the monitoring instrument. When the ring main unit is shut down and loses an external power supply, the built-in battery can supply power for the device and enter a dormant state, if abnormity or fault occurs, the device can be awakened, fault information is recorded and actively transmitted to a background monitoring center, and then the device enters the dormant state; when power is again applied, the device will display an exception or fault message. The problems of insufficient battery endurance, manual regular inspection and maintenance and the like of the ring main unit monitoring instrument are avoided.
Please refer to fig. 2. The monitoring instrument 2 comprises a current indicating unit 22, a temperature indicating unit 23, a switch state indicating unit 24, a fault indicating unit 25, a data recording unit 26, a communication unit 27 and a downloading unit 28 which are respectively connected with a main control unit 21 of the monitoring instrument.
The current indicating unit 22 is used for displaying current signals acquired by the current acquisition device in the operation process of the ring main unit in a digital form through AD conversion, and can monitor A, B, C three-phase current; A. c phase current and zero sequence current; A. b, C three-phase current and zero-sequence current.
The temperature indicating unit 23 is used for displaying the temperature signal acquired by the temperature acquisition device 4 in a digital form through AD conversion, and can monitor A, B, C the temperature of the three-phase cable head, the single-phase abnormal temperature and the interphase abnormal temperature.
The switch state 24 indicating unit is used for displaying the on and off states of the load switch, judging the switch state in real time, and respectively representing the on state or the off state of the load switch by displaying 'on' or 'off'.
The fault indication unit 25 comprises a load current abnormity alarm subunit, a short circuit fault alarm subunit, a ground fault alarm subunit and a temperature abnormity alarm subunit, when the fault occurs, the field monitoring instrument can send out an alarm signal, and simultaneously can send out an abnormity alarm signal to the background and the mobile terminal. The load current alarm subunit adopts a current threshold value setting and judging method, and when the load current in the operation of the ring main unit approaches or exceeds a preset maximum working current value, the load current alarm subunit sends out a pre-alarm signal; the short-circuit fault alarm subunit adopts a short-circuit waveform judging method, when a current value is larger than a short-circuit current threshold value and a sudden current maintains delta T time (20ms is less than or equal to delta T is less than or equal to 3s) when a sudden change of a certain phase current in the operation of the ring main unit is detected, the current value is instantly reduced by within 5A, the short-circuit fault is judged, and a short-circuit fault alarm signal is sent; the ground fault alarm subunit adopts a time delay method, when the fact that zero-phase current is increased to a ground current threshold value and delta T time (delta T is larger than or equal to 200ms) is maintained in the operation of the ring main unit is detected, the ring main unit is judged to be a ground fault, and a ground fault alarm signal is sent; when the temperature sensor monitors that the operating temperature of the cable exceeds a set value or the phase temperature difference exceeds 20 ℃, the temperature abnormity alarm subunit displays temperature abnormity through the LED flickering indicator lamp and sends out a pre-alarm signal.
The data recording unit 26 includes a current information recording subunit, a temperature information recording subunit, a short-circuit fault recording subunit, and a ground fault recording subunit, and is a nonvolatile memory. The current information recording subunit records the current at the integral point of the day and the highest current of the day, and records the current at the integral point of the day and the highest current of the day for 90 days in total. The temperature information recording subunit records the current day integral point temperature and the current day maximum temperature, and records the 90 day integral point temperature and the day maximum temperature in total. The short-circuit fault recording subunit records the short-circuit fault time of 30 times and historical short-circuit fault time. The ground fault recording subunit records the 30 nearby ground fault times and the historical ground fault time.
The communication unit 27 mainly adopts an RS485 or wireless transmission communication mode to transmit the monitoring information of each ring main unit to the information generator, and the information generator is communicated with a distribution network measurement and control terminal (DTU) through the RS485 communication mode. The distribution network measurement and control terminal communicates with a host of a remote operation and maintenance monitoring center through a special scheduling channel network or communicates with a mobile phone terminal of an operation and maintenance worker through a wireless special network or GPRS (general packet radio service), and monitoring data are transmitted to background monitoring software, so that a ring main unit operation and fault state monitoring system is established. The communication protocol adopts a 101 balance transmission mode, and the fault information is actively reported.
The downloading unit 28 supports the USB disk to download the data in the data recording unit through the USB interface, and can be downloaded into an execute form for viewing at the computer.
The utility model discloses a looped netowrk cabinet on-line monitoring device's panel schematic diagram is shown in figure 3. The monitor surface plate comprises a display screen 51, a key 52, a short circuit alarm lamp, a grounding alarm lamp, a temperature alarm lamp, a charged indication phase checking hole, an antenna port 53 for communication, a data downloading USB interface 54 and the like. The display screen of the monitoring instrument in the running state of the ring main unit has real-time display, parameter setting, equipment setting and information management for operation and maintenance personnel to inquire and operate. The operation keys include an up key, a down key, a cancel key, a confirm key, a reset/test key, and the like. The short circuit alarm lamp comprises an A-phase short circuit alarm lamp L1, a B-phase short circuit alarm lamp L2, a C-phase short circuit alarm lamp L3, an O-phase grounding alarm lamp L0 and a temperature alarm lamp LT.
The utility model discloses a looped netowrk cabinet on-line monitoring device can carry out integrated monitoring and demonstration to electric and non-electric volume such as load current, fault current, cable joint temperature, environment humiture under the looped netowrk cabinet running state, has functions such as the discernment of running state anomaly and trouble, judgement, warning in advance. The product has characteristics such as safe, convenient, high-efficient, general, can effectively promote looped netowrk cabinet fortune dimension efficiency, realizes the lean fortune of looped netowrk cabinet dimension, reduces fortune dimension cost and trouble and salvagees the power off time simultaneously, brings good economic benefits for the electric wire netting fortune dimension.
It will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as limitations of the present invention, and that changes and modifications to the above described embodiments will fall within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (4)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021099133.6U CN212808564U (en) | 2020-06-15 | 2020-06-15 | Ring main unit on-line monitoring device |
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| CN202021099133.6U CN212808564U (en) | 2020-06-15 | 2020-06-15 | Ring main unit on-line monitoring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111624512A (en) * | 2020-06-15 | 2020-09-04 | 国网上海市电力公司 | Ring main unit on-line monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111624512A (en) * | 2020-06-15 | 2020-09-04 | 国网上海市电力公司 | Ring main unit on-line monitoring device |
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