CN110824999B - Power grid flash alarm device and alarm method thereof - Google Patents
Power grid flash alarm device and alarm method thereof Download PDFInfo
- Publication number
- CN110824999B CN110824999B CN201911200445.3A CN201911200445A CN110824999B CN 110824999 B CN110824999 B CN 110824999B CN 201911200445 A CN201911200445 A CN 201911200445A CN 110824999 B CN110824999 B CN 110824999B
- Authority
- CN
- China
- Prior art keywords
- signal relay
- alarm
- relay
- solid
- signal
- 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.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0428—Safety, monitoring
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24024—Safety, surveillance
Abstract
The invention discloses a power grid flash alarm device and an alarm method thereof, the device comprises a primary circuit and a secondary circuit, the primary circuit comprises a solid state relay, a voltage transformation module and a first signal relay, the solid state relay is connected with an alternating current commercial power and forms a loop with a primary coil of the voltage transformation module, the first signal relay is connected in series with a normally open point of the solid state relay and forms a loop with a secondary coil of the voltage transformation module, the solid state relay is used for controlling the closing or the breaking of the normally open point of the solid state relay, the secondary circuit comprises a battery, an alarm switch, a reset switch, a normally closed point of a first signal relay and a second signal relay, the battery, the alarm switch, the reset switch, the normally closed point of the first signal relay and the second signal relay are sequentially connected in series to form a loop, the secondary circuit further comprises an alarm, and the alarm is connected with the second signal relay in parallel.
Description
Technical Field
The invention relates to the field of operation of property facilities, in particular to a power grid flash alarm device and an alarm method thereof.
Background
The faults of the power transmission line belong to most transient faults, which account for more than 80-90% of the total fault frequency, most transient faults are caused by insulator surface flashover caused by lightning, line-to-branch discharge, line collision caused by strong wind, bird damage, branch falling on a lead, insulator surface pollution and the like, and after the faults are disconnected by a relay protection action, fault points are dissociated, electric arcs are extinguished, the insulation strength is recovered, and the faults are automatically eliminated. At the moment, if the breaker of the power transmission line is closed, power supply can be recovered, so that the power failure time is reduced, and the power supply reliability is improved.
After the overhead line fault is cleared, closing the circuit breaker in a short time, namely reclosing and reclosing; reclosing is one of the self-recovery power supply methods commonly employed in operation, since in practice most overhead line faults are transient or temporary. The shortest allowable interval time of reclosing is 0.15-0.5 seconds.
In the management of the commercial office project in the property, a proprietor has a plurality of important electric equipment facilities, such as monitoring, a data machine room, important loads which cannot be powered off and the like, a power grid is flashed for a few tenths of a second in the middle of the equipment, a power supply is automatically cut off, a program is automatically returned, the equipment does not work, and the time is long, so that the great economic and reputation loss is caused to the proprietor.
In order to avoid the influence of the power grid flash on the owner equipment, some owners solve the problem by additionally installing a UPS (uninterruptible power supply), but the UPS only can play a role in maintaining power supply for a short time, the owners cannot timely receive the fault record of the flash, and the UPS needs to occupy a large space, so that the cost is high, and the owners cannot detect the influence of the power grid flash on the equipment in real time.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a power grid flash alarm device and a power grid flash alarm method.
In order to achieve the purpose, the invention adopts the following technical scheme: a power grid flash alarm device comprises a primary circuit and a secondary circuit, wherein the primary circuit comprises a solid-state relay, a voltage transformation module and a first signal relay, the solid-state relay is connected with an alternating current mains supply and forms a loop with a primary coil of the voltage transformation module, the first signal relay is connected with a normally open point of the solid-state relay in series and forms a loop with a secondary coil of the voltage transformation module, the solid-state relay is used for controlling the normally open point of the solid-state relay to be closed or disconnected, the secondary circuit comprises a battery, an alarm switch, a reset switch, a normally closed point of a first signal relay and a second signal relay, the battery, the alarm switch, the reset switch, the normally closed point of the first signal relay and the second signal relay are sequentially connected in series to form a loop, and the secondary circuit further comprises an alarm, the alarm is connected with the second signal relay in parallel, a normally open point of the second signal relay is connected with a normally closed point of the first signal relay in parallel, the first signal relay is used for controlling the closing or opening of a normally closed point of the first signal relay, and the second signal relay is used for controlling the closing or opening of a normally open point of the second signal relay.
The further technical scheme is as follows: the transformation module is a 5V direct current transformer.
The further technical scheme is as follows: the specific model of the direct current transformer is HLK-PM 01.
The further technical scheme is as follows: the specific model of the solid-state relay is TSR-50 DA.
The further technical scheme is as follows: the specific models of the first signal relay and the second signal relay are AGN200S4 HZ.
The further technical scheme is as follows: the battery is a 1.5V direct current battery.
The further technical scheme is as follows: the specific model of the alarm is YS-BJ 02.
An alarming method of a power grid flash alarm device is based on any one of the above mentioned devices, and includes the following steps:
the primary circuit detects whether alternating current commercial power is input;
if no alternating current commercial power is input, the solid-state relay is disconnected after power failure, and the normally-open point of the solid-state relay is disconnected;
the first signal relay is disconnected when power is lost, and a normally closed point of the first signal relay is closed;
the second signal relay is switched on, the alarm gives an alarm, and meanwhile, the normally open point of the second signal relay is self-locked;
the alarm continues to give an alarm until the reset switch is manually turned off.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a power grid flash alarm device and an alarm method thereof, and the power grid flash alarm device realizes continuous alarm of a buzzer by matching a solid-state relay with a signal relay for self-locking. And when the power grid flash-off happens, the alarm is continuously given out until a person on duty closes the alarm, and the flash-off of more than 0.02 second can be captured. The alarm is realized by matching the solid-state relay with the signal relay, the characteristic of a novel non-contact switch consisting of the solid-state relay without solid-state electronic elements is utilized, and the aim of connecting and disconnecting the circuit in a non-contact and non-spark manner and high-speed response manner is fulfilled by utilizing the switching characteristics of the electronic elements (such as switching triodes, bidirectional thyristors and other semiconductor devices). The utility model has the advantages of realize that the very first time can discover to report when the flash event appears, in time handle, reduce the influence of electric power flash event to property and customer, and whole electric wire netting flash alarm device occupation space is little, with low costs, facilitate promotion.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more apparent, the following detailed description will be given of preferred embodiments.
Drawings
Fig. 1 is a circuit diagram of a power grid flash alarm device.
Fig. 2 is a flow chart of an alarming method of the power grid flash alarm device.
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 detail with reference to the accompanying drawings and the detailed description.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only 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 considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be connected or detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by one skilled in the art.
As shown in fig. 1, a power grid flash alarm device includes a primary circuit 10 and a secondary circuit 20, the primary circuit 10 includes a solid state relay SSR1, a voltage transformation module and a first signal relay KA1, the solid state relay SSR1 is connected with an ac mains supply and forms a loop with a primary coil of the voltage transformation module, the first signal relay KA1 is connected in series with a normally open point SSR1 'of the solid state relay SSR1 and forms a loop with a secondary coil of the voltage transformation module, the solid state relay SSR1 is used for controlling the closing or opening of the normally open point SSR 1' of the solid state relay SSR1, the secondary circuit 20 includes a battery, an alarm switch S1, a reset switch SB1, a normally closed point KA1 'of the first signal relay KA1 and a second signal relay KA2, the battery, the alarm switch S1, the reset switch SB1, the normally closed point KA 1' of the first signal relay 1 and the second signal relay 2 are connected in series in turn to form a loop, the secondary circuit 20 further, the alarm H1 is connected in parallel with the second signal relay KA2, a normally open point KA2 'of the second signal relay KA2 is connected in parallel with a normally closed point KA 1' of the first signal relay KA1, the first signal relay KA1 is used for controlling the closing or opening of the normally closed point KA1 'of the first signal relay KA1, and the second signal relay KA2 is used for controlling the closing or opening of the normally open point KA 2' of the second signal relay KA 2. When the power grid flash alarm device is connected with a power grid through a common socket to normally supply power, the coil of the solid-state relay SSR1 is attracted, the normally open point SSR1 'of the solid-state relay SSR1 is switched on, the coil of the first signal relay KA1 powered by the voltage transformation module is attracted, the normally closed point KA 1' of the first signal relay KA1 is switched off, the buzzer does not alarm, and the battery does not output current; when the power grid is in flash interruption, the coil of the solid-state relay SSR1 loses power, the normally-closed point KA1 'of the first signal relay KA1 is closed, the second signal relay KA2 powered by the battery is conducted, the buzzer gives an alarm, and meanwhile the normally-open point KA 2' of the second signal relay KA2 is self-locked, so that the alarm can be continuously given out even after the power grid is powered on until the artificial reset switch SB1 is reached. The SSR1 is a contactless electronic switch with an isolation function, and has no mechanical contact part in the switching process, so that the SSR1 has the same functions as an electromagnetic relay, and also has the characteristics of logic circuit compatibility, vibration and mechanical impact resistance, no limit on the installation position, good moisture, mildew and corrosion resistance, excellent explosion and ozone pollution prevention performance, small input power, high sensitivity, small control power, good electromagnetic compatibility, low noise, high working frequency and the like. Can act within 0.02 second and completely meet the requirement. The reclosing speed of the power grid is generally 0.3-0.5 second, and in order to acquire an instantaneous power-off signal, the buzzer continuously alarms by adopting a solid state relay SSR1 in cooperation with a signal relay for self-locking. And when the power grid flash occurs, the alarm is continuously given out until a watch keeper turns off the alarm H1. Flash over 0.02 seconds can be captured. The solid-state relay SSR1 is matched with a signal relay to realize alarming, the characteristic of a novel non-contact switch consisting of the solid-state relay SSR1 without solid-state electronic elements is utilized, and the purposes of non-contact and non-spark, high-speed response on-off and circuit disconnection are achieved by utilizing the switching characteristics of the electronic elements (such as switching triodes, bidirectional thyristors and other semiconductor devices). The utility model has the advantages of realize that the very first time can discover to report when the flash event appears, in time handle, reduce the influence of electric power flash event to property and customer, and whole electric wire netting flash alarm device occupation space is little, with low costs, facilitate promotion.
Specifically, the transformation module is a 5V direct current transformer.
Specifically, the specific model of the direct current transformer is HLK-PM 01.
Specifically, the specific model of the solid-state relay SSR1 is TSR-50 DA.
Specifically, the specific models of the first signal relay KA1 and the second signal relay KA2 are AGN200S4 HZ.
Specifically, the battery is a 1.5V dc battery.
Specifically, the specific model of the alarm H1 is YS-BJ 02.
Specifically, the power grid flash alarm device can be used for expanding short message reminding based on GPRS and is connected with a photosensitive printer to realize an alarm recording function. And the telephone reminding and other customization functions are realized, and the telephone of the relevant responsible person is automatically dialed immediately when the flash break occurs, so that the unattended function is realized.
As shown in fig. 2, an alarm method of a power grid flash alarm device is based on the power grid flash alarm device shown in fig. 1, and includes the following steps:
the first-stage circuit 10 detects whether an alternating current commercial power is input;
if no alternating current commercial power is input, the SSR1 is powered off and disconnected, and a normally open point SSR 1' of the SSR1 is disconnected;
the first signal relay KA1 is disconnected after power loss, and a normally closed point KA 1' of the first signal relay KA1 is closed;
the second signal relay KA2 is switched on, the alarm H1 gives an alarm, and meanwhile the normally open point KA 2' of the second signal relay KA2 is self-locked;
the alarm H1 continues to alarm until the reset switch SB1 is manually opened. The alarm method realizes alarm by matching the solid state relay SSR1 with the signal relay, utilizes the characteristic of a novel contactless switch consisting of the solid state relay SSR1 without solid state electronic elements, and achieves the purposes of contactless and sparkless high-speed response on-off circuit by utilizing the switching characteristics of the electronic elements (such as switching triodes, bidirectional thyristors and other semiconductor devices). The utility model has the advantages of realize that the very first time can discover to report when the flash event appears, in time handle, reduce the influence of electric power flash event to property and customer, and whole electric wire netting flash alarm device occupation space is little, with low costs, facilitate promotion.
Specifically, if the primary circuit 10 detects that an alternating current mains supply is input, the coil of the first signal relay KA1 powered by the voltage transformation module is attracted, the normally-closed point KA 1' of the first signal relay KA1 is disconnected, the buzzer does not give an alarm, and the battery does not output current.
Compared with the prior art, the power grid flash alarm device and the alarm method thereof provided by the invention have the advantages that the buzzer continuously alarms by matching the solid-state relay with the signal relay for self-locking. When the power grid flash-off happens, the alarm is continuously given out until the attendant turns off the alarm, and the flash-off of more than 0.02 second can be captured. The alarm is realized by matching the solid-state relay with the signal relay, the characteristic of a novel non-contact switch consisting of the solid-state relay without solid-state electronic elements is utilized, and the aim of connecting and disconnecting the circuit in a non-contact and non-spark manner and high-speed response manner is fulfilled by utilizing the switching characteristics of the electronic elements (such as switching triodes, bidirectional thyristors and other semiconductor devices). The utility model has the advantages of realize that the very first time can discover to report when the flash event appears, in time handle, reduce the influence of electric power flash event to property and customer, and whole electric wire netting flash alarm device occupation space is little, with low costs, facilitate promotion. The technical contents of the present invention are further illustrated by the examples only for the convenience of the reader, but the embodiments of the present invention are not limited thereto, and any technical extension or re-creation based on the present invention is protected by the present invention. The protection scope of the invention is subject to the claims.
Claims (2)
1. A power grid flash alarm device is characterized by comprising a primary circuit and a secondary circuit, wherein the primary circuit comprises a solid-state relay, a voltage transformation module and a first signal relay, the solid-state relay is connected with an alternating current mains supply and forms a loop with a primary coil of the voltage transformation module, the first signal relay is connected with a normally open point of the solid-state relay in series and forms a loop with a secondary coil of the voltage transformation module, the solid-state relay is used for controlling the closing or the breaking of the normally open point of the solid-state relay, the secondary circuit comprises a battery, an alarm switch, a reset switch, a normally closed point of the first signal relay and a second signal relay, the battery, the alarm switch, the reset switch, the normally closed point of the first signal relay and the second signal relay are sequentially connected in series to form a loop, and the secondary circuit further comprises an alarm, the alarm is connected with the second signal relay in parallel, a normally open point of the second signal relay is connected with a normally closed point of the first signal relay in parallel, the first signal relay is used for controlling the closing or opening of a normally closed point of the first signal relay, the second signal relay is used for controlling the closing or opening of a normally open point of the second signal relay, the voltage transformation module is a 5V direct current transformer, the specific model of the direct current transformer is HLK-PM01, the specific model of the solid state relay is TSR-50DA, the specific models of the first signal relay and the second signal relay are AGN200S4HZ, the battery is a 1.5V direct current battery, and the specific model of the alarm is YS-BJ 02.
2. The method for alarming the power grid flash alarm device is based on the power grid flash alarm device of claim 1, and is characterized by comprising the following steps of:
the primary circuit detects whether alternating current commercial power is input;
if no alternating current commercial power is input, the solid-state relay is disconnected after power failure, and the normally-open point of the solid-state relay is disconnected;
the first signal relay is disconnected when power is lost, and a normally closed point of the first signal relay is closed;
the second signal relay is switched on, the alarm gives an alarm, and meanwhile, the normally open point of the second signal relay is self-locked;
the alarm continues to give an alarm until the reset switch is manually turned off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911200445.3A CN110824999B (en) | 2019-11-29 | 2019-11-29 | Power grid flash alarm device and alarm method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911200445.3A CN110824999B (en) | 2019-11-29 | 2019-11-29 | Power grid flash alarm device and alarm method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110824999A CN110824999A (en) | 2020-02-21 |
| CN110824999B true CN110824999B (en) | 2021-07-02 |
Family
ID=69543228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911200445.3A Active CN110824999B (en) | 2019-11-29 | 2019-11-29 | Power grid flash alarm device and alarm method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110824999B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111251892A (en) * | 2020-02-28 | 2020-06-09 | 中车青岛四方车辆研究所有限公司 | Safety loop system and rail train |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4717910A (en) * | 1985-11-12 | 1988-01-05 | Scripps Keith A | Detector and light assembly |
| CN101201378A (en) * | 2007-11-20 | 2008-06-18 | 陕西永辉测控技术有限公司 | Intermittent disconnection testing system for electric contact piece |
| CN203101489U (en) * | 2013-01-10 | 2013-07-31 | 中国石油天然气股份有限公司 | Instantaneous power failure alarm |
| CN203422132U (en) * | 2013-08-22 | 2014-02-05 | 宣化钢铁集团有限责任公司 | Warning device for preventing industrial devices or other facilities from being soaked with water |
| CN203630906U (en) * | 2013-11-28 | 2014-06-04 | 李雷 | Alarm circuit for instantaneous power-down accident of DC 24V signal control circuit |
| CN104267314A (en) * | 2014-10-13 | 2015-01-07 | 青海聚能电力有限公司 | Instant outage alarm |
| CN204142816U (en) * | 2014-08-27 | 2015-02-04 | 彩虹彩色显像管总厂 | A kind of voltage fluctuation warning device |
| CN204719164U (en) * | 2015-05-13 | 2015-10-21 | 上海涵嘉电气设备有限公司 | Electrical network flash warning system |
| CN108873812A (en) * | 2018-06-22 | 2018-11-23 | 西安飞机工业（集团）有限责任公司 | A kind of power supply system flash monitoring method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203217035U (en) * | 2013-04-12 | 2013-09-25 | 核工业理化工程研究院 | Alarm monitoring device for momentary interruption of power supply system |
-
2019
- 2019-11-29 CN CN201911200445.3A patent/CN110824999B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4717910A (en) * | 1985-11-12 | 1988-01-05 | Scripps Keith A | Detector and light assembly |
| CN101201378A (en) * | 2007-11-20 | 2008-06-18 | 陕西永辉测控技术有限公司 | Intermittent disconnection testing system for electric contact piece |
| CN203101489U (en) * | 2013-01-10 | 2013-07-31 | 中国石油天然气股份有限公司 | Instantaneous power failure alarm |
| CN203422132U (en) * | 2013-08-22 | 2014-02-05 | 宣化钢铁集团有限责任公司 | Warning device for preventing industrial devices or other facilities from being soaked with water |
| CN203630906U (en) * | 2013-11-28 | 2014-06-04 | 李雷 | Alarm circuit for instantaneous power-down accident of DC 24V signal control circuit |
| CN204142816U (en) * | 2014-08-27 | 2015-02-04 | 彩虹彩色显像管总厂 | A kind of voltage fluctuation warning device |
| CN104267314A (en) * | 2014-10-13 | 2015-01-07 | 青海聚能电力有限公司 | Instant outage alarm |
| CN204719164U (en) * | 2015-05-13 | 2015-10-21 | 上海涵嘉电气设备有限公司 | Electrical network flash warning system |
| CN108873812A (en) * | 2018-06-22 | 2018-11-23 | 西安飞机工业（集团）有限责任公司 | A kind of power supply system flash monitoring method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110824999A (en) | 2020-02-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102005720B (en) | Neutral line breakage detection protection method and device | |
| CN111060803A (en) | Circuit breaker tripping and closing circuit full-working-condition monitoring circuit | |
| CN110824999B (en) | Power grid flash alarm device and alarm method thereof | |
| CN201094134Y (en) | Residual current operation protector with self-diagnostic function | |
| CN209946326U (en) | Breaker opening electric loop fault monitoring system | |
| CN111555279A (en) | Method for maintaining power utilization continuity based on intelligent unloading of three-level load | |
| CN211579581U (en) | Power-off protection system for motor of compressor of refrigerating unit | |
| CN111458633B (en) | Tripping and closing monitoring circuit and fault alarming method | |
| CN201038735Y (en) | Locking and interlocking device for coal mine main draught fan and down-hole power supply | |
| CN201860175U (en) | Operation controller for field suppression switch | |
| CN210092862U (en) | Temperature detection device capable of automatically cutting off control loop and circuit breaker | |
| CN107026424A (en) | A kind of distribution low-voltage master switch automatic time delay closing device | |
| CN108110726B (en) | Ship shore equipotential protection device | |
| CN208655010U (en) | A kind of remote auto switch | |
| CN207530357U (en) | A kind of track circuit unit and its cabinet | |
| CN212989582U (en) | Primary distribution switchgear operation performance monitoring device | |
| CN213782972U (en) | High-voltage power distribution cabinet opening and closing monitoring circuit and system | |
| CN111585255B (en) | Trip monitoring loop | |
| CN209250341U (en) | A kind of sub-gate circuit and monitoring device with standby | |
| CN108508829A (en) | Crush-cutting machine real time and on line monitoring system is crossed by a kind of small power station based on mobile Internet | |
| CN217741297U (en) | Low-voltage circuit breaker secondary circuit fault detection device | |
| CN219697350U (en) | Low-voltage protection device | |
| CN217590363U (en) | Incoming line spare power automatic switching protection device without contact | |
| CN216356534U (en) | Circuit for preventing tripping of low-voltage frequency converter by using standby power supply | |
| CN213423751U (en) | Safety controller based on circuit breaker electric operating mechanism |
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 |