CN110702246A - Method and system for monitoring connection state of main loop of switch cabinet - Google Patents
Method and system for monitoring connection state of main loop of switch cabinet Download PDFInfo
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- CN110702246A CN110702246A CN201911008983.2A CN201911008983A CN110702246A CN 110702246 A CN110702246 A CN 110702246A CN 201911008983 A CN201911008983 A CN 201911008983A CN 110702246 A CN110702246 A CN 110702246A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K3/00—Thermometers giving results other than momentary value of temperature
- G01K3/08—Thermometers giving results other than momentary value of temperature giving differences of values; giving differentiated values
- G01K3/14—Thermometers giving results other than momentary value of temperature giving differences of values; giving differentiated values in respect of space
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Abstract
The invention relates to the technical field of switch cabinet safety, in particular to a method and a system for monitoring the connection state of a main loop of a switch cabinet. The invention discloses a method and a system for monitoring the connection state of a main loop of a switch cabinet, wherein the method for monitoring the connection state of the main loop of the switch cabinet comprises the following steps: s1, acquiring the temperature of each connection point to be monitored of each phase main loop in the switch cabinet in real time; s2, calculating the temperature difference delta T between the connection points at the same positions of any two-phase main loop; s3, comparing each temperature difference value delta T with a threshold value, and alarming if one temperature difference value delta T exceeds the threshold value. The method can accurately monitor the reliability of the connection of the main loop without considering the actual current of the loop, improves the safety and reliability of the switch cabinet, and has simple algorithm and easy realization.
Description
Technical Field
The invention belongs to the technical field of switch cabinet safety, and particularly relates to a method and a system for monitoring the connection state of a main loop of a switch cabinet.
Background
Each tie point reliable connection of major loop of middling pressure switchgear is the basis of equipment safe operation, when the tie point because various reasons do not have reliable connection, contact resistance can corresponding improvement, the aggravation that generates heat leads to the inside temperature of equipment to improve, the insulating part is ageing with higher speed, cause major accident, so, all increase temperature measuring device at each tie point of major loop on the existing market, reflect major loop connection state through the temperature of each tie point of monitoring major loop, the concrete way is: the actually monitored temperature of each connection point of the main loop is respectively and independently compared with the highest set value of the equipment temperature (currently, the temperature in the industry is set to be 105 ℃), and if the temperature exceeds the highest set value of the equipment temperature, an alarm signal is provided.
However, in most applications, the real load current of the loop generally only reaches 20-30% of the rated current of the device, and in such applications, even when a certain connection point of the main loop is not particularly reliable, such as loose, the heating of the loop is still limited, and the monitored temperature does not reach 105 degrees, so that the fault cannot be identified for alarming, and the safety and reliability are low.
Disclosure of Invention
The present invention is directed to a method and a system for monitoring a connection status of a main circuit of a switch cabinet, so as to solve the above-mentioned problems.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for monitoring the connection state of a main loop of a switch cabinet comprises the following steps:
s1, acquiring the temperature of each connection point to be monitored of each phase main loop in the switch cabinet in real time;
s2, calculating the temperature difference delta T between the connection points at the same positions of any two-phase main loop;
s3, comparing each temperature difference value delta T with a threshold value, and alarming if one temperature difference value delta T exceeds the threshold value.
Further, step S4 is included, in which the temperature of each connection point to be monitored is displayed according to the time variation curve.
Further, step S1 is specifically: and collecting the temperature of each connection point to be monitored of the A/B/C three-phase main loop in the switch cabinet.
Further, in step S1, each connection point to be monitored includes a main bus connection point, a switch cabinet upper static contact connection point, a switch cabinet lower static contact connection point, and a cable overlapping row connection point.
Further, in step S1, the temperature of each connection point to be monitored of each phase main loop in the switch cabinet is collected by using a wireless temperature sensor.
Further, the threshold is 10 ℃.
Further, in step S3, each temperature difference Δ T is compared with a threshold, and if a temperature difference Δ T exceeds the threshold, an audio alarm and/or a light alarm is/are performed.
The invention also discloses a monitoring system of the connection state of the main loop of the switch cabinet, which comprises a temperature sensor, a main control module and an alarm device;
the temperature sensor is used for acquiring the temperature of each connection point to be monitored of each phase main loop in the switch cabinet in real time and transmitting the temperature to the main control module,
the main control module is used for calculating the temperature difference delta T between the connection points at the same positions of any two phases of main circuits; and comparing each temperature difference value delta T with a threshold value, and controlling an alarm device to give an alarm if one temperature difference value delta T exceeds the threshold value.
Further, the temperature sensor is a wireless temperature sensor.
Further, the alarm device is a sound alarm device and/or a light alarm device.
The invention has the beneficial technical effects that:
the temperature difference of the connection points at the same positions of any two phases is used as a judgment basis, so that the reliability of the connection of the main loop can be accurately monitored without being influenced by the actual current of the loop, the safety and the reliability of the switch cabinet are improved, and the algorithm is simple and easy to realize.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method of monitoring in accordance with an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a monitoring system according to an embodiment of the present invention.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The invention will now be further described with reference to the accompanying drawings and detailed description.
As shown in fig. 1, a method for monitoring a connection state of a main circuit of a switch cabinet includes the following steps:
and S1, acquiring the temperature of each connection point to be monitored of each phase main loop in the switch cabinet in real time.
Specifically, in the present embodiment, the switch cabinet is a medium voltage switch cabinet, but the present invention is not limited thereto, and any other switch cabinet that needs to perform monitoring of the connection state of the main circuit is applicable.
In this embodiment, the switch cabinet has an a/B/C three-phase main circuit, and therefore step S1 specifically includes: the temperature of each connection point to be monitored of an A/B/C three-phase main loop in the switch cabinet is collected in real time. Of course, in other embodiments, the switch cabinet may have two phases, four phases, etc.
In this embodiment, each connection point to be monitored includes a main bus connection point, a switch cabinet upper static contact connection point, a switch cabinet lower static contact connection point, and a cable overlapping row connection point, but not limited thereto, and in other embodiments, the connection point to be monitored may be selected according to an actual situation, which can be easily implemented by a person skilled in the art and is not described in detail.
In this embodiment, it is preferable to use a wireless temperature sensor to collect the temperature of each connection point to be monitored of the a/B/C three-phase main circuit in the switch cabinet, and the wireless temperature sensor is used to cause little interference to the switch cabinet and is easy to install.
And S2, calculating the temperature difference delta T between the connection points at the same positions of any two-phase main loop.
Taking the connection point of the main bus as an example, the temperature collected by the connection point of the main bus of the phase A is set to be Ta, the temperature collected by the connection point of the main bus of the phase B is set to be Tb, and the temperature collected by the connection point of the main bus of the phase C is set to be Tc, so that the delta T comprises Ta-Tb, Tb-Tc and Ta-Tc.
The calculation for other connection points is similar and will not be described in detail.
S3, comparing each temperature difference value delta T with a threshold value, and alarming if one temperature difference value delta T exceeds the threshold value.
Namely, as long as any temperature difference value delta T exceeds a threshold value, an alarm is given, and a manager is reminded that the connection of the main loop is unreliable, so that the processing can be performed in time, and the safety and the reliability of the switch cabinet are improved.
The temperature difference delta T is used as a judgment basis, so that the influence of the actual current of the loop can be avoided, and the connection reliability of the main loop can be monitored more accurately and effectively.
In the specific embodiment, the threshold is preferably 10 ℃, when the threshold is obtained by summarizing and processing data in temperature rise test reports of switch equipment of different manufacturers and different specifications through creative work, and by adopting the threshold, the monitoring is more accurate and the reliability is higher.
In this embodiment, a sound alarm and/or a light alarm may be used to remind the manager that the connection of the main circuit is not reliable, but the present invention is not limited thereto.
Further, the present embodiment further includes step S4, displaying a temperature variation curve of each connection point to be monitored with time, so that a manager can view a variation state of each connection point to be monitored.
The following will be explained with specific examples:
in a switch cabinet with rated current 1250A, a temperature sensor is arranged at a connection point of a static contact on an A/B/C three-phase to carry out temperature monitoring; in a certain time period, the temperatures of the connection points of the three-phase static contacts obtained by monitoring are respectively 35 ℃, 50 ℃ and 38 ℃, and then the temperature difference value Δ T between the connection points of any two-phase static contacts is respectively as follows: 15 ℃, 12 ℃ and 3 ℃, wherein the temperature of 15 ℃ and 12 ℃ exceed a set threshold (10 ℃), and the equipment sends an alarm signal.
The invention also discloses a monitoring system of the connection state of the main circuit of the switch cabinet, which comprises a temperature sensor 1, a main control module 2 and an alarm device 3, wherein the temperature sensor 1 is used for acquiring the temperature of each connection point to be monitored of each phase of main circuit in the switch cabinet in real time and transmitting the temperature to the main control module; the control module 2 is used for calculating the temperature difference delta T between the connection points at the same position of any two-phase main loop; and comparing each temperature difference value delta T with a threshold value, and controlling an alarm device to give an alarm if one temperature difference value delta T exceeds the threshold value.
In this embodiment, the temperature sensor 1 is preferably a wireless temperature sensor, and the wireless temperature sensor is adopted, so that the interference to the switch cabinet is small, and the installation is easy.
In this embodiment, the switch cabinet has an a/B/C three-phase main circuit, and the temperature sensors 1 are respectively installed on a main bus of the a/B/C three-phase main circuit, an upper fixed contact of the switch cabinet, a lower fixed contact of the switch cabinet, and a branch row of the cable room to collect temperatures.
In this embodiment, the alarm device 3 may be a sound alarm device and/or a light alarm device. The sound alarm device can be realized by a buzzer, and the light alarm device can be realized by an LED lamp.
The temperature difference of the connection points at the same positions of any two phases is used as a judgment basis, so that the reliability of the connection of the main loop can be accurately monitored without being influenced by the actual current of the loop, the safety and the reliability of the switch cabinet are improved, and the algorithm is simple and easy to realize.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method for monitoring the connection state of a main loop of a switch cabinet is characterized by comprising the following steps:
s1, acquiring the temperature of each connection point to be monitored of each phase main loop in the switch cabinet in real time;
s2, calculating the temperature difference delta T between the connection points at the same positions of any two-phase main loop;
s3, comparing each temperature difference value delta T with a threshold value, and alarming if one temperature difference value delta T exceeds the threshold value.
2. The method for monitoring the connection status of the main circuit of the switch cabinet according to claim 1, further comprising a step S4 of displaying the temperature variation curve of each connection point to be monitored along with time.
3. The method for monitoring the connection state of the main circuit of the switch cabinet according to claim 1 or 2, wherein the step S1 is specifically as follows: and collecting the temperature of each connection point to be monitored of the A/B/C three-phase main loop in the switch cabinet.
4. The method for monitoring the connection state of the main loop of the switch cabinet according to claim 1 or 2, wherein in step S1, each connection point to be monitored comprises a main bus connection point, a switch cabinet upper static contact connection point, a switch cabinet lower static contact connection point and a cable overlapping row connection point.
5. The method for monitoring the connection state of the main circuit of the switch cabinet according to claim 1 or 2, wherein in step S1, the temperature of each connection point to be monitored of each phase main circuit in the switch cabinet is acquired by using a wireless temperature sensor.
6. The method for monitoring the connection state of the main circuit of the switch cabinet according to claim 1 or 2, wherein: the threshold is 10 ℃.
7. The method for monitoring the connection state of the main circuit of the switch cabinet according to claim 1 or 2, wherein: in step S3, each temperature difference Δ T is compared with a threshold, and if a temperature difference Δ T exceeds the threshold, an audible alarm and/or a light alarm is/are performed.
8. The utility model provides a monitoring system of cubical switchboard major loop connection state which characterized in that: the temperature sensor, the main control module and the alarm device are included;
the temperature sensor is used for acquiring the temperature of each connection point to be monitored of each phase main loop in the switch cabinet in real time and transmitting the temperature to the main control module,
the main control module is used for calculating the temperature difference delta T between the connection points at the same positions of any two phases of main circuits; and comparing each temperature difference value delta T with a threshold value, and controlling an alarm device to give an alarm if one temperature difference value delta T exceeds the threshold value.
9. The monitoring system for the connection state of the main circuit of the switch cabinet according to claim 8, wherein: the temperature sensor is a wireless temperature sensor.
10. The monitoring system for the connection state of the main circuit of the switch cabinet according to claim 8, wherein: the alarm device is a sound alarm device and/or a light alarm device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911008983.2A CN110702246A (en) | 2019-10-23 | 2019-10-23 | Method and system for monitoring connection state of main loop of switch cabinet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911008983.2A CN110702246A (en) | 2019-10-23 | 2019-10-23 | Method and system for monitoring connection state of main loop of switch cabinet |
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| CN110702246A true CN110702246A (en) | 2020-01-17 |
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| CN201911008983.2A Pending CN110702246A (en) | 2019-10-23 | 2019-10-23 | Method and system for monitoring connection state of main loop of switch cabinet |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113156304A (en) * | 2020-10-16 | 2021-07-23 | 国电泉州热电有限公司 | Switch equipment detection method and device |
| CN113686463A (en) * | 2021-09-06 | 2021-11-23 | 广东电网有限责任公司 | Temperature monitoring device and method and power distribution equipment |
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| CN202350949U (en) * | 2011-12-13 | 2012-07-25 | 陕西同力电气有限公司 | Switch cabinet fiber grating temperature measuring system |
| CN102829885A (en) * | 2012-08-14 | 2012-12-19 | 广东电网公司佛山供电局 | Method for detecting and judging overheating fault of bus joint of gas insulation switch device |
| CN204758748U (en) * | 2015-07-27 | 2015-11-11 | 北京恒源力创电力技术有限公司 | Cubical switchboard intelligent integrated monitoring devices |
| CN109406004A (en) * | 2018-09-18 | 2019-03-01 | 广东电网有限责任公司惠州供电局 | A kind of switchgear temperature rise analytical method |
| CN110265974A (en) * | 2019-06-29 | 2019-09-20 | 潍柴动力股份有限公司 | Temperature checking method and device |
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2019
- 2019-10-23 CN CN201911008983.2A patent/CN110702246A/en active Pending
Patent Citations (5)
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| CN202350949U (en) * | 2011-12-13 | 2012-07-25 | 陕西同力电气有限公司 | Switch cabinet fiber grating temperature measuring system |
| CN102829885A (en) * | 2012-08-14 | 2012-12-19 | 广东电网公司佛山供电局 | Method for detecting and judging overheating fault of bus joint of gas insulation switch device |
| CN204758748U (en) * | 2015-07-27 | 2015-11-11 | 北京恒源力创电力技术有限公司 | Cubical switchboard intelligent integrated monitoring devices |
| CN109406004A (en) * | 2018-09-18 | 2019-03-01 | 广东电网有限责任公司惠州供电局 | A kind of switchgear temperature rise analytical method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113156304A (en) * | 2020-10-16 | 2021-07-23 | 国电泉州热电有限公司 | Switch equipment detection method and device |
| CN113686463A (en) * | 2021-09-06 | 2021-11-23 | 广东电网有限责任公司 | Temperature monitoring device and method and power distribution equipment |
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Application publication date: 20200117 |