CN114093144A - Switch cabinet temperature early warning method and system - Google Patents
Switch cabinet temperature early warning method and system Download PDFInfo
- Publication number
- CN114093144A CN114093144A CN202111266108.1A CN202111266108A CN114093144A CN 114093144 A CN114093144 A CN 114093144A CN 202111266108 A CN202111266108 A CN 202111266108A CN 114093144 A CN114093144 A CN 114093144A
- Authority
- CN
- China
- Prior art keywords
- temperature
- early warning
- key part
- value
- threshold value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
- G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
- G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/30—Cabinet-type casings; Parts thereof or accessories therefor
Abstract
The invention relates to a temperature early warning method and a temperature early warning system for a switch cabinet, which are used for collecting the temperature of each key part and the ambient temperature; processing data to obtain temperature range values and temperature rise index function values of all key parts; when the temperature of each key part reaches or exceeds a temperature alarm threshold value or the temperature of each key part does not reach the alarm threshold value, but the temperature degree value and the temperature rise index function value of at least one key part both reach or exceed the corresponding threshold value, a red early warning signal is sent out; and when the temperature of each key part does not reach the temperature alarm threshold value, but one of the temperature degree value and the temperature rise index function value of at least one key part reaches or exceeds the corresponding threshold value, a yellow early warning signal is sent out. The comprehensive research and judgment are carried out based on the temperature data of the key parts and the environment, so that the operation and maintenance level can be improved, and the maintenance accuracy can be improved.
Description
Technical Field
The invention relates to the technical field of power monitoring, in particular to a temperature early warning method and system for a switch cabinet.
Background
The switch cabinet can cause the potential safety hazard in the operation process because of the heating and partial discharge of the contact, bus connection, cable connection and other parts of the switch in the long-term operation. These data, especially temperature data, need to be monitored in real time and judged whether to analyze and send out the early warning, otherwise difficult in time overhaul before the trouble takes place.
The early warning is only carried out based on the temperature data, the consideration is not comprehensive, and the consideration of temperature rise is lacked. Only the temperature condition of the key part is considered, and accurate early warning cannot be achieved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a switch cabinet temperature early warning method and system, which are used for comprehensively studying and judging temperature data based on key parts and environment, so that the operation and maintenance level can be improved, and the maintenance accuracy can be improved.
In order to achieve the purpose, the invention provides a switch cabinet temperature early warning method, which comprises the following steps:
collecting the temperature of each key part and the ambient temperature;
processing data to obtain temperature range values and temperature rise index function values of all key parts;
when the temperature of each key part reaches or exceeds a temperature alarm threshold value or the temperature of each key part does not reach the alarm threshold value, but the temperature degree value and the temperature rise index function value of at least one key part both reach or exceed the corresponding threshold value, a red early warning signal is sent out;
and when the temperature of each key part does not reach the temperature alarm threshold value, but one of the temperature degree value and the temperature rise index function value of at least one key part reaches or exceeds the corresponding threshold value, a yellow early warning signal is sent out.
Furthermore, the key parts comprise a bus, a moving contact and a static contact of the circuit breaker and a cable plug.
Further, the temperature degree value U1(t) and temperature rise index function value U2(t) is:
wherein Fg(t) temperature of critical part at time t, Fh(t) is the ambient temperature at time t.
Further, 1 day and 24 points of sampling data are taken, and the interval is 1 hour.
Further, when the temperature of each key part does not reach the temperature alarm threshold value and one of the temperature degree value and the temperature rise index function value of each key part does not reach the corresponding threshold value, no early warning signal is sent out.
Further, the temperature alarm threshold is 120 ℃, and the corresponding thresholds of the temperature range value of the key part and the temperature rise index function value are both 0.7.
Further, a red early warning signal is sent out, the power supply of the switch cabinet is stopped, and emergency maintenance is carried out; and a yellow early warning signal is sent out, the power supply of the switch cabinet is not required to be stopped immediately, and maintenance is arranged.
Another aspect provides a switch cabinet temperature early warning system, including:
the acquisition module acquires the temperature of each key part and the ambient temperature;
the data processing module is used for processing data to obtain a temperature degree value and a temperature rise index function value of each key part;
the early warning module is used for sending a red early warning signal when the temperature of each key part reaches or exceeds a temperature alarm threshold value or the temperature of each key part does not reach the alarm threshold value, but the temperature degree value and the temperature rise index function value of at least one key part both reach or exceed the corresponding threshold values; and when the temperature of each key part does not reach the temperature alarm threshold value, but one of the temperature degree value and the temperature rise index function value of at least one key part reaches or exceeds the corresponding threshold value, a yellow early warning signal is sent out.
Furthermore, the key parts comprise a bus, a moving contact and a static contact of the circuit breaker and a cable plug.
Further, the temperature degree value U1(t) and temperature rise index function value U2(t) is:
wherein Fg(t) temperature of critical part at time t, Fh(t) is the ambient temperature at time t.
The technical scheme of the invention has the following beneficial technical effects:
(1) the comprehensive research and judgment are carried out based on the temperature data of the key parts and the environment, so that the operation and maintenance level can be improved, and the maintenance accuracy can be improved.
(2) The temperature warning method and the system have the advantages that temperature and temperature rise are considered during temperature warning, so that on one hand, the condition of low temperature and high temperature rise can be avoided, and on the other hand, excessive warning under the condition of high temperature and low temperature rise can be avoided.
Drawings
FIG. 1 is a schematic diagram of an early warning principle;
FIG. 2 is a schematic diagram of the early warning logic;
fig. 3 is a schematic diagram of the early warning system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The temperature of the bus bar, the upper and lower contacts, the connector, and other parts is directly related to the power flowing through the parts, such as the connection state, the contact state, the aging state, and the like of the interface. It is because of this direct relationship that temperature is an important parameter characterizing the operating conditions of the switchgear. With reference to fig. 1, the present invention comprehensively evaluates and performs a graded pre-warning based on the temperature data of the key parts and the environment.
The provided early warning method for the temperature of the switch cabinet comprises the following steps:
(1) the temperature of each critical part and the ambient temperature are collected.
The key parts include but are not limited to a bus, a moving contact and a static contact of a breaker and a cable plug, and are the parts with the highest temperature in the switch cabinet.
(2) And (4) processing data to obtain the temperature degree value and the temperature rise index function value of each key part.
When whether the switch cabinet needs to be overhauled or not is judged, the temperature of the key part and the ambient temperature in the cabinet are comprehensively considered, and a temperature index function and an index function mainly considering temperature rise data are respectively established to quantify the temperature of the key part and the temperature rise degree, as shown in a formula (1).
In the formula: u shape1(t) is characterized by a degree value of temperature at the time t, the variation range is 0-1, and U2(t) the index function value of temperature rise data is mainly considered at the moment t, the variation range is 0-1, the closer to 1, the higher the expression degree is, and when the temperature of a key part exceeds 120 ℃, early warning is needed no matter how much the temperature rises. Fh(t) ambient temperature at time t, Fg(t) is the temperature at the joint at time t;and t is 1,2, 24, namely 1 day of 24-point sampling data is taken. And taking 0.7 as an early warning threshold value.
(3) And (4) judging: when the temperature of each key part reaches or exceeds a temperature alarm threshold value or the temperature of each key part does not reach the alarm threshold value, but the temperature degree value and the temperature rise index function value of at least one key part both reach or exceed the corresponding threshold value, a red early warning signal is sent out; when the temperature of each key part does not reach the temperature alarm threshold value, but one of the temperature degree value and the temperature rise index function value of at least one key part reaches or exceeds the corresponding threshold value, a yellow early warning signal is sent out; and when the temperature of each key part does not reach the temperature alarm threshold value and one of the temperature degree value and the temperature rise index function value of each key part does not reach the corresponding threshold value, not sending out an early warning signal.
The early warning decision logic is shown in fig. 2. Temperature rise is also considered to the temperature when carrying out the temperature early warning, so on the one hand can avoid not early warning under the high temperature rise condition of low temperature, on the other hand can avoid the excessive early warning of the low temperature rise condition of high temperature. Therefore, the index function U is established only considering absolute temperature data1(t) adding an index function U mainly considering temperature rise data2(t) to jointly judge whether to warn, as shown in the logic figure 2: 1) when the temperature of the key part exceeds 120 ℃, U1(t)、U2(t) sending out a red early warning no matter whether the value exceeds 0.7 or not; 2) when the temperature of the key part is lower than 120 ℃, U1(t)、U2(t) when the values exceed 0.7, a red early warning is sent out; 3) when the temperature of the key part is lower than 120 ℃, U1(t)、U2(t) if one of the values is greater than 0.7, a yellow early warning is given; 4) when the temperature of the key part is lower than 120 ℃, U1(t)、U2The (t) value is not more than 0.7, and no early warning is given.
The red early warning indicates that the switch cabinet is seriously abnormal and needs emergency maintenance or even replacement of parts; the yellow warning is less abnormal than the red warning, but needs to be checked and maintained as soon as possible.
On the other hand, a switch cabinet temperature early warning system is provided, as shown in fig. 3, and includes an acquisition module, a data processing module and an early warning module.
And the acquisition module acquires the temperature and the ambient temperature of each key part. The key parts comprise a bus, a breaker moving contact and a breaker static contact and a cable plug.
And the data processing module is used for processing data to obtain the temperature degree value and the temperature rise index function value of each key part.
Degree of temperature value U1(t) and temperature rise index function value U2(t) is:
wherein Fg(t) temperature of critical part at time t, Fh(t) is the ambient temperature at time t.
The early warning module is used for sending a red early warning signal when the temperature of each key part reaches or exceeds a temperature alarm threshold value or the temperature of each key part does not reach the alarm threshold value, but the temperature degree value and the temperature rise index function value of at least one key part both reach or exceed the corresponding threshold values; and when the temperature of each key part does not reach the temperature alarm threshold value, but one of the temperature degree value and the temperature rise index function value of at least one key part reaches or exceeds the corresponding threshold value, a yellow early warning signal is sent out.
In summary, according to the switch cabinet temperature early warning method and system provided by the invention, the temperature of each key part and the ambient temperature are collected; processing data to obtain temperature range values and temperature rise index function values of all key parts; when the temperature of each key part reaches or exceeds a temperature alarm threshold value or the temperature of each key part does not reach the alarm threshold value, but the temperature degree value and the temperature rise index function value of at least one key part both reach or exceed the corresponding threshold value, a red early warning signal is sent out; and when the temperature of each key part does not reach the temperature alarm threshold value, but one of the temperature degree value and the temperature rise index function value of at least one key part reaches or exceeds the corresponding threshold value, a yellow early warning signal is sent out. The comprehensive research and judgment are carried out based on the temperature data of the key parts and the environment, so that the operation and maintenance level can be improved, and the maintenance accuracy can be improved.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A temperature early warning method for a switch cabinet is characterized by comprising the following steps:
collecting the temperature of each key part and the ambient temperature;
processing data to obtain temperature range values and temperature rise index function values of all key parts;
when the temperature of each key part reaches or exceeds a temperature alarm threshold value or the temperature of each key part does not reach the alarm threshold value, but the temperature degree value and the temperature rise index function value of at least one key part both reach or exceed the corresponding threshold value, a red early warning signal is sent out;
and when the temperature of each key part does not reach the temperature alarm threshold value, but one of the temperature degree value and the temperature rise index function value of at least one key part reaches or exceeds the corresponding threshold value, a yellow early warning signal is sent out.
2. The switch cabinet temperature early warning method according to claim 1, wherein the key parts comprise a bus, a moving contact and a static contact of a breaker and a cable plug.
3. The switch cabinet temperature early warning method according to claim 1 or 2, characterized in that the temperature degree value U is1(t) and temperature rise index function value U2(t) is:
wherein Fg(t) temperature of critical part at time t, Fh(t) is the ambient temperature at time t.
4. The switch cabinet temperature early warning method according to claim 3, wherein t is 1, 2.. 24, and 24-point sampling data are taken for 1 day at intervals of 1 hour.
5. The switch cabinet temperature early warning method according to claim 3, wherein when the temperature of each key part does not reach the temperature alarm threshold value and one of the temperature degree value and the temperature rise index function value of each key part does not reach the corresponding threshold value, no early warning signal is sent out.
6. The switch cabinet temperature early warning method according to claim 3, wherein the temperature alarm threshold is 120 ℃, and the corresponding thresholds of the temperature degree value and the temperature rise index function value of the key part are both 0.7.
7. The switch cabinet temperature early warning method according to claim 1 or 2, characterized in that a red early warning signal is sent out, the power supply of the switch cabinet is stopped, and emergency maintenance is carried out; and a yellow early warning signal is sent out, the power supply of the switch cabinet is not required to be stopped immediately, and maintenance is arranged.
8. The utility model provides a cubical switchboard temperature early warning system which characterized in that includes:
the acquisition module acquires the temperature of each key part and the ambient temperature;
the data processing module is used for processing data to obtain a temperature degree value and a temperature rise index function value of each key part;
the early warning module is used for sending a red early warning signal when the temperature of each key part reaches or exceeds a temperature alarm threshold value or the temperature of each key part does not reach the alarm threshold value, but the temperature degree value and the temperature rise index function value of at least one key part both reach or exceed the corresponding threshold values; and when the temperature of each key part does not reach the temperature alarm threshold value, but one of the temperature degree value and the temperature rise index function value of at least one key part reaches or exceeds the corresponding threshold value, a yellow early warning signal is sent out.
9. The switch cabinet temperature early warning system of claim 8, wherein the key parts comprise a bus, a moving contact and a static contact of a circuit breaker and a cable plug.
10. The temperature early warning system of switch cabinet according to claim 8 or 9, characterized in that the temperature degree value U is1(t) and temperature rise index function value U2(t) is:
wherein Fg(t) temperature of critical part at time t, Fh(t) is the ambient temperature at time t.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111266108.1A CN114093144B (en) | 2021-10-28 | 2021-10-28 | Switch cabinet temperature early warning method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111266108.1A CN114093144B (en) | 2021-10-28 | 2021-10-28 | Switch cabinet temperature early warning method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114093144A true CN114093144A (en) | 2022-02-25 |
| CN114093144B CN114093144B (en) | 2023-09-08 |
Family
ID=80298103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111266108.1A Active CN114093144B (en) | 2021-10-28 | 2021-10-28 | Switch cabinet temperature early warning method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114093144B (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1442938A (en) * | 2003-04-14 | 2003-09-17 | 李彤 | Method of on line prealarming when temperature of plug in switch cabinet is abnormal |
| CN1687724A (en) * | 2005-06-10 | 2005-10-26 | 清华大学 | Method for monitoring and evaluating safe operation of cable and device thereof |
| US20070045286A1 (en) * | 2005-08-12 | 2007-03-01 | Takafumi Mizuno | Switching power supply and method for stopping supply of electricity when switching power supply exceeds rated capacity |
| US20110164387A1 (en) * | 2010-01-05 | 2011-07-07 | Huaizhong Yan | Switch cabinet connection and combination apparatus and method of manufacturing the same |
| CN202710196U (en) * | 2012-08-07 | 2013-01-30 | 深圳供电局有限公司 | Heating temperature difference warning device for closed switch cabinet |
| CN107342576A (en) * | 2017-06-05 | 2017-11-10 | 江苏尚坤电力安装有限公司 | A kind of high-tension switch cabinet on-line monitoring and early warning guard method and its system |
| 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 |
| CN109473878A (en) * | 2018-10-26 | 2019-03-15 | 国电南京自动化股份有限公司 | A kind of In-Line Temperature Measure System of locomotive power supply dc switch cabinet body |
| CN109781266A (en) * | 2019-01-31 | 2019-05-21 | 福州大学 | A kind of the heating power distribution and overheating warning system of Substation Electric Equipment key position |
| CN110794253A (en) * | 2020-01-02 | 2020-02-14 | 珠海万力达电气自动化有限公司 | Switch cabinet health state evaluation method and device |
| CN110969796A (en) * | 2019-12-06 | 2020-04-07 | 无锡圣敏传感科技股份有限公司 | Fire alarm method and fire detector |
| CN111486991A (en) * | 2020-05-09 | 2020-08-04 | 国家电网有限公司 | Overheating risk early warning device and early warning method for 10kV high-voltage switch cabinet |
| CN113432854A (en) * | 2021-06-21 | 2021-09-24 | 云南电网有限责任公司保山供电局 | High-voltage switch cabinet tulip contact state monitoring method, system, equipment and medium |
-
2021
- 2021-10-28 CN CN202111266108.1A patent/CN114093144B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1442938A (en) * | 2003-04-14 | 2003-09-17 | 李彤 | Method of on line prealarming when temperature of plug in switch cabinet is abnormal |
| CN1687724A (en) * | 2005-06-10 | 2005-10-26 | 清华大学 | Method for monitoring and evaluating safe operation of cable and device thereof |
| US20070045286A1 (en) * | 2005-08-12 | 2007-03-01 | Takafumi Mizuno | Switching power supply and method for stopping supply of electricity when switching power supply exceeds rated capacity |
| US20110164387A1 (en) * | 2010-01-05 | 2011-07-07 | Huaizhong Yan | Switch cabinet connection and combination apparatus and method of manufacturing the same |
| CN202710196U (en) * | 2012-08-07 | 2013-01-30 | 深圳供电局有限公司 | Heating temperature difference warning device for closed switch cabinet |
| CN107342576A (en) * | 2017-06-05 | 2017-11-10 | 江苏尚坤电力安装有限公司 | A kind of high-tension switch cabinet on-line monitoring and early warning guard method and its system |
| 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 |
| CN109473878A (en) * | 2018-10-26 | 2019-03-15 | 国电南京自动化股份有限公司 | A kind of In-Line Temperature Measure System of locomotive power supply dc switch cabinet body |
| CN109781266A (en) * | 2019-01-31 | 2019-05-21 | 福州大学 | A kind of the heating power distribution and overheating warning system of Substation Electric Equipment key position |
| CN110969796A (en) * | 2019-12-06 | 2020-04-07 | 无锡圣敏传感科技股份有限公司 | Fire alarm method and fire detector |
| CN110794253A (en) * | 2020-01-02 | 2020-02-14 | 珠海万力达电气自动化有限公司 | Switch cabinet health state evaluation method and device |
| CN111486991A (en) * | 2020-05-09 | 2020-08-04 | 国家电网有限公司 | Overheating risk early warning device and early warning method for 10kV high-voltage switch cabinet |
| CN113432854A (en) * | 2021-06-21 | 2021-09-24 | 云南电网有限责任公司保山供电局 | High-voltage switch cabinet tulip contact state monitoring method, system, equipment and medium |
Non-Patent Citations (2)
| Title |
|---|
| 张志锋: "基于面阵测温的高压开关柜温度状态监测系统研究", 《电器与能效管理技术》 * |
| 张志锋: "基于面阵测温的高压开关柜温度状态监测系统研究", 《电器与能效管理技术》, 30 March 2021 (2021-03-30) * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114093144B (en) | 2023-09-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103776622B (en) | A kind of Mechanical Failure of HV Circuit Breaker rapid diagnosis system | |
| CN101382572B (en) | Novel detection device for protector for surge | |
| CN110941918A (en) | Intelligent substation fault analysis system | |
| CN110988592A (en) | Electric leakage safety monitoring device and method | |
| CN106443362A (en) | Power distribution network fault detection system | |
| CN202929174U (en) | High voltage circuit breaker on-line monitoring system | |
| CN107328438A (en) | A kind of power transformer runs comprehensive monitor system | |
| CN114485796A (en) | Online state monitoring self-diagnosis system of box-type substation | |
| CN105865532A (en) | Monitoring and alarming system for transformer substation secondary system TMOV lightning arrester main board | |
| CN204214573U (en) | A kind of arc light temperature-detecting device | |
| CN114093144B (en) | Switch cabinet temperature early warning method and system | |
| CN106646116A (en) | Trouble shooting and locating method for power distribution network | |
| CN212844140U (en) | Vacuum degree online intelligent early warning system based on electric field intensity measurement | |
| CN203658326U (en) | Online micro water content and density monitoring device for SF6 gas | |
| CN202076781U (en) | Protector with temperature monitoring | |
| CN205809249U (en) | A kind of circuit breakers monitoring device | |
| CN104578430A (en) | Online monitoring device for circuit breaker operating mechanism | |
| CN201429663Y (en) | On-line detection device for surge protector | |
| CN114638485A (en) | Full-service ubiquitous power Internet of things danger coefficient induction and fault repair system | |
| CN114264902A (en) | Method and system for monitoring working state of lightning protection box, electronic equipment and storage medium | |
| CN211452652U (en) | 10KV middling pressure power cable temperature electric power operation maintenance detection device | |
| CN112751421A (en) | Digital computing enhanced high-reliability low-voltage power distribution safety monitoring system | |
| CN113488966A (en) | Communication power supply module output isolation protection device | |
| CN205940616U (en) | Secondary system TMOV of transformer substation lightning protection device mainboard monitoring alarm device | |
| CN115277079B (en) | Power terminal information attack monitoring method and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |