CN113270849A - Low-voltage protection calibration device and calibration method - Google Patents
Low-voltage protection calibration device and calibration method Download PDFInfo
- Publication number
- CN113270849A CN113270849A CN202110539481.3A CN202110539481A CN113270849A CN 113270849 A CN113270849 A CN 113270849A CN 202110539481 A CN202110539481 A CN 202110539481A CN 113270849 A CN113270849 A CN 113270849A
- Authority
- CN
- China
- Prior art keywords
- protection
- current
- voltage
- motor
- low
- 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.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0822—Integrated protection, motor control centres
Landscapes
- Engineering & Computer Science (AREA)
- Artificial Intelligence (AREA)
- Evolutionary Computation (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of Electric Motors In General (AREA)
- Protection Of Generators And Motors (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention relates to the technical field of electrical control, in particular to a low-voltage protection calibration device and a calibration method. The low-voltage protection checking device comprises a current transformer, a voltage module, a power supply module, a DI/DO control panel, an AO output unit, a central processing unit, a communication unit, a display module and a data line; the central processing unit is used for verifying protection actions by writing protection parameters of the low-voltage protection device in a two-way communication mode through the communication unit, so that the motor is perfectly protected. The checking device can provide signal acquisition and signal output of the low-voltage protection device, can solve the problems that the input and output functions cannot be freely set in the product design in the prior art by utilizing the advantages of the communication between the C language logic address and background software, and the like, and meanwhile, the control software-single chip microcomputer realizes the intelligentization of the control function of the single chip microcomputer through the two-way communication of the communication interface.
Description
Technical Field
The invention relates to the technical field of electrical control, in particular to a low-voltage protection calibration device and a calibration method.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The comprehensive protection of the motor is an important protection technology, and a low-voltage protection method as one of the carriers of the comprehensive protection technology is widely used in various devices with motors to prevent the motors from burning out, electric leakage, fire and personal casualties. The traditional motor protector has overvoltage, undervoltage, overcurrent and open-phase protection, system parameters (primary current, rated power and the like), protection parameters (overcurrent protection, unbalanced protection, undervoltage protection, overvoltage protection, underpower protection, external fault, overload protection, locked rotor protection, grounding protection and the like) and other data need to be set through a display operation panel when power transmission debugging test and field motor protection parameter setting are carried out, the protection parameters corresponding to different motor powers are different, the parameter setting is more (generally more than 15 items are needed), login needs to be carried out through passwords through the panel setting, various parameters are set in sequence, the motor protector is heavy and complex, and the efficiency is lower.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a low-voltage protection calibration device and a calibration method, the calibration device can provide signal acquisition and signal output of the low-voltage protection device, the problems that the input and output functions cannot be freely set in the product design in the prior art and the like can be solved by utilizing the communication advantages of a C language logic address and background software, and meanwhile, the control software-single chip microcomputer realizes the intellectualization of the control function of the single chip microcomputer through the two-way communication of a communication interface.
In order to achieve the above object, a first aspect of the present invention provides a low voltage protection verification apparatus, which includes a current transformer, a voltage module, a power supply module, a DI/DO control board, an AO output unit, a central processing unit, a communication unit, a display module, and a data line.
The central processing unit is used for verifying protection actions by writing protection parameters of the low-voltage protection device in a two-way communication mode through the communication unit, so that the motor is perfectly protected.
The second aspect of the present invention provides a method for verifying low voltage protection, which comprises the following specific steps:
(1) by adopting the low-voltage protection calibration device, current and voltage signals are collected from the input end of the motor through the current transformer and the voltage module in the body;
(2) setting protection parameters of a low-voltage protection device to a central processing unit, performing two-way communication through a communication unit, writing the protection parameters, and realizing real-time detection on three-phase current, three-phase voltage, leakage current and the state of a contactor of the motor through various logics, judgment and calculation in the central processing unit;
(3) and the result obtained by the central processing unit is output through the AO output unit, so that various motor protections are realized.
One or more technical schemes of the invention have the following beneficial effects:
(1) the checking device provides signal acquisition and signal output of low-voltage protection, and can solve the problems that the input and output functions cannot be freely set in the product design in the prior art by utilizing the advantages of communication between the C language logic address and background software;
(2) the control software-single chip microcomputer is in two-way communication through the communication interface, so that the intellectualization of the control function is realized;
(3) the protection parameters of the low-voltage protection device are set for the central processing unit, and the protection parameters are written through bidirectional communication of the communication interface, so that the number of setting items of the parameters is greatly reduced, and the method has the obvious advantages of simplicity in operation, reliability in operation, convenience in programming and high verification efficiency.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of a low voltage protection verification apparatus according to the present invention;
fig. 2 is a logic block diagram of a verification method for low voltage protection provided by the present invention.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced in the background art, in the prior art, when a power transmission debugging test and field motor protection parameter setting are performed on a conventional motor protector, data such as system parameters and protection parameters need to be set through a display operation panel, and the protection parameters corresponding to different motor powers are different, so that the parameter setting is more. In order to solve the technical problems, the invention provides a low-voltage protection checking device which comprises a current transformer, a voltage module, a power supply module, a DI/DO control board, an AO output unit, a central processing unit, a communication unit, a display module and a data line.
And the central processing unit is used for verifying the protection action by writing the protection parameters of the low-voltage protection device in the communication unit through bidirectional communication so as to perfect protection of the motor.
The central processing unit is used as a core component of the control body, and the secondary current induced by the through cable is mainly sent to the central processing unit through a mutual inductor arranged in the body to provide a current signal; the actual voltage of access is converted into a voltage signal that can be received by the central processing unit through the voltage module in the body, and the real-time detection of the three-phase current, the three-phase voltage, the leakage current and the state of the contactor of the motor is realized through various logics, judgment and calculation in the central processing unit, so that the perfect protection of the motor is realized, all protection functions are mutually independent, multiple protection functions can be triggered simultaneously, and the protection function which firstly achieves a tripping condition sends a tripping command.
A power supply module: providing device power supplies of all control boards; under the condition that voltage fluctuation or voltage interference occurs to mains supply voltage, the anti-interference function of the low-voltage protector device is realized by changing the capacity and the size of key components such as an upper capacitor and a transformer of a power module circuit board, the low-voltage protector device can normally work, and the duration time is 4 s.
A communication unit: the method is used for establishing communication connection with various upper computer software.
DI/DO control Panel: 8-path DI and 5-path DO, which receive and output various different switching value signals, and the functions are designed arbitrarily and programmable.
An AO output unit: and one path of 4-20mA signal is output, so that a stable 4-20mA signal can be provided for upper computers such as DCS (distributed control system) and the like, and the real-time running current value of the motor is visually displayed and detected.
A display module: the 122 x 32 lattice liquid crystal is used as a display screen, and can display real-time data of motor operation, operation state and information of equipment parameters.
Data line: the main use is connected control body and display module, can make things convenient for artificial observation and control on data, state, signal transmission and the communication to display module of control body.
In one or more embodiments of the invention, the communication unit is a 485 communication unit.
The second aspect of the present invention provides a method for verifying low voltage protection, which comprises the following specific steps:
(1) by adopting the low-voltage protection calibration device, current and voltage signals are collected from the input end of the motor through the current transformer and the voltage module in the body;
(2) setting protection parameters of a low-voltage protection device to a central processing unit, performing two-way communication through a communication unit, writing the protection parameters, and realizing real-time detection on three-phase current, three-phase voltage, leakage current and the state of a contactor of the motor through various logics, judgment and calculation in the central processing unit;
(3) and the result obtained by the central processing unit is output through the AO output unit, so that various motor protections are realized.
In one or more embodiments of the invention, the low voltage protection comprises: overload protection, overcurrent protection, open-phase unbalance protection, locked rotor protection and acceleration overtime protection.
The overload protection reflects the average heating condition of stator and rotor windings, prevents the motor from overheating, and mainly protects the overload and asymmetric overload of the motor.
The open-phase unbalance protection refers to when the motor is in open phase or three-phase unbalance.
The locked rotor protection is a special protection for the motor, and is suitable for the protection of the motor with great fault current, such as the motor shaft is blocked (commonly called as a band-type brake) due to overlarge load or self mechanical reasons.
In one or more embodiments of the present invention, when the motor is in overload protection and is in overload fault operation, the measurement and control device calculates the heat capacity I2t of the motor according to the heating characteristic of the motor, so as to protect the motor, and the delay characteristic is as follows:
where N is I/Ir1, K is the curve rate, and t is the actual action time. I is the actual current and Ir1 is the motor rated current.
Wherein, N is I/Ir1
t actual action time.
The overload characteristic is shown in the following overload action characteristic schedule.
The heat capacity of the measuring and controlling device to the motor is calculated by percentage, and the maximum value is 100 percent.
In one or more embodiments of the present invention, when the open-phase unbalance protection is performed, the unbalance rate is calculated as follows:
when Iav > Ir 1:
when Iav < Ir1
The motor I runs current, Iav is the average effective value of three-phase current, and Ir1 is the full load current of the motor;
to avoid an accidental situation, the action characteristics are set as follows: when the operation unbalance rate < action set value 0.95 does not act, the operation unbalance rate > action set value 1.0 acts;
the delay characteristic is as follows: and the action is carried out after the time delay set by the fixed time delay.
In one or more embodiments of the present invention, when performing overcurrent protection, the overcurrent protection is a timer protection:
to avoid an accidental situation, the action characteristics are set as follows: when the three-phase current average value is less than the overcurrent set value 0.95, the three-phase current is not operated; when the three-phase current average value is larger than the overcurrent set value 1.0, the operation is carried out;
the delay characteristic is as follows: and the action is carried out after the time delay set by the fixed time delay.
In one or more embodiments of the invention, when locked-rotor protection is carried out, when the fault current is greater than the set allowable breaking current, the protection device does not trip, only alarms, and breaks the current after the current falls below the allowable breaking current;
to avoid an accidental situation, the action characteristics are set as follows: the three-phase current is not operated when the maximum value of the three-phase current is less than the locked rotation set value 0.95, and is operated when the maximum value of the three-phase current is greater than the locked rotation set value 1.0;
the delay characteristic is as follows: and the action is carried out after the time delay set by the fixed time delay.
In one or more embodiments of the present invention, when the acceleration timeout protection is performed, if the current does not fall to the rated current (below the full load current) within a predetermined time after the start command is received, the vehicle is considered to be accelerated timeout and immediately stops, thereby protecting the safety of the motor device.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
Example 1
Overload protection: the overload protection reflects the average heating condition of the stator and rotor windings and prevents the motor from overheating. Mainly protecting the overload and asymmetric overload of the motor.
The following parameters are set for overload protection:
example 2
Open-phase unbalance protection: when the motor is in phase loss or three-phase imbalance, if the imbalance rate reaches a protection set value, the measurement and control device sends a command of stopping or alarming.
The following parameters are set:
| |
5％～60％+OFF |
| Time of action | 0.1～50S |
| Unbalanced mode of motion | Trip/alarm |
The operation characteristics include that the operation unbalance rate < operation set value 0.95 does not operate, and the operation unbalance rate > operation set value 1.0 operates.
The delay characteristic is a fixed time limit and acts after the delay time set by the fixed delay.
Example 3
Overcurrent protection: the overcurrent protection is a timer protection.
The following parameters are set
| Action value setting range | (100％～1000％)Ir1+OFF |
| Delay time setting range | 0.5～50S |
| Execution mode | Trip/alarm |
The action characteristic is that the three-phase current average value is less than the overcurrent set value 0.95, and the three-phase current does not act;
when the three-phase current average value is larger than the overcurrent set value 1.0, the operation is carried out;
the delay characteristic is a fixed time limit and acts after the delay time set by the fixed delay.
Example 4
Locked rotor protection: the locked rotor protection is a special protection for the motor, and is suitable for the protection of the motor with great fault current, such as the motor shaft being blocked (commonly called as a band-type brake) due to overlarge load or self mechanical reasons.
When the fault current is larger than the set allowable breaking current, the protection device does not trip and only alarms until the current falls below the allowable breaking current and then is broken.
The following parameters are set:
| action value setting range | 100% Ir 1-allowable breaking Current + OFF |
| Delay time setting range | 0.5～50S |
| Protection action mode | Trip/alarm |
The action characteristic is that the three-phase current does not act when the maximum value of the three-phase current is less than the locked-rotor set value 0.95;
when the maximum value of the three-phase current is greater than a locked rotor set value 1.0, the action is carried out;
delay characteristics: and (4) timing, and acting after the delay time set by the fixed delay.
Example 5
Starting acceleration timeout protection: after receiving the starting command, if the current does not drop to the rated current (below the full load current) within the specified time, the acceleration is considered to be overtime, and the vehicle is immediately stopped, so that the safety of the motor equipment is protected.
As shown in fig. 1, when the motor direct start mode is performed, the motor start/stop control and the protector failure reset can be realized by the switching values DI1 to DI 8. During operation, voltage signals (namely UA/UB/UC of a terminal) collected from the input end of the motor and current signals of a built-in mutual inductor of a CT connected in a loop are transmitted to a central processing unit of an M16C singlechip to carry out data analysis and calculation, the fault type of the motor is judged, and corresponding relay output is made according to user set parameters, so that various protections to the motor are realized. All protection functions can be set, started or closed through control software according to the actual parameter conditions of the field load, and protection parameters can be adjusted.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a calibration equipment of low pressure protection which characterized in that: the device comprises a current transformer, a voltage module, a power supply module, a DI/DO control panel, an AO output unit, a central processing unit, a communication unit, a display module and a data line;
a current transformer: sending the secondary current induced by the feed-through cable to a central processing unit to provide a current signal;
a voltage module: converting the accessed actual voltage into a voltage signal which can be received by the central processing unit;
a communication unit: the system is used for establishing communication connection with various upper computer software;
the central processing unit writes protection parameters of the low-voltage protection device through two-way communication of the communication unit, verifies protection actions and carries out perfect protection on the motor;
DI/DO control Panel: receiving and outputting various different switching value signals;
an AO output unit: providing a stable current signal for an upper computer, and visually displaying the real-time running current value of the detected motor;
a display module: displaying real-time data of the operation of the motor, the operation state and information of equipment parameters;
data line: the intelligent power supply mainly plays a role in connection, and transmits and communicates data, states and signals of a current transformer, a voltage module, a power supply module, a DI/DO control panel, an AO output unit, a central processing unit and a communication unit to a display module;
a power supply module: a power supply is provided.
2. The low voltage protection verification device of claim 1, wherein: the communication unit is a 485 communication unit.
3. A low-voltage protection verification method is characterized in that: the low-voltage protection verifying device of claim 1 or 2 is adopted, and comprises the following specific steps:
(1) collecting current and voltage signals from the input end of the motor through a current transformer and a voltage module in the body;
(2) setting protection parameters of a low-voltage protection device to a central processing unit, performing two-way communication through a communication unit, writing the protection parameters, and realizing real-time detection on three-phase current, three-phase voltage, leakage current and the state of a contactor of the motor through various logics, judgment and calculation in the central processing unit;
(3) and the result obtained by the central processing unit is output through the AO output unit, so that various motor protections are realized.
4. The method for verifying low voltage protection according to claim 3, wherein: the low-voltage protection device comprises the following protection items: overload protection, overcurrent protection, open-phase unbalance protection, locked rotor protection and acceleration overtime protection.
5. The method for verifying low voltage protection according to claim 4, wherein: when overload protection is carried out, when the motor runs in overload fault, the measuring and controlling device calculates the heat capacity of the motor according to the heating characteristic of the motor, and the motor is protected.
6. The method for verifying low voltage protection according to claim 4, wherein: and carrying out open-phase unbalance protection by calculating the unbalance rate.
7. The method for verifying low voltage protection according to claim 6, wherein: to avoid an accidental situation, the action characteristics are set as follows: when the operation unbalance rate < action set value 0.95 does not act, the operation unbalance rate > action set value 1.0 acts;
the delay characteristic is as follows: and the action is carried out after the time delay set by the fixed time delay.
8. The method for verifying low voltage protection according to claim 4, wherein: when overcurrent protection is carried out, the overcurrent protection is fixed time limit protection;
to avoid an accidental situation, the action characteristics are set as follows: when the three-phase current average value is less than the overcurrent set value 0.95, the three-phase current is not operated; when the three-phase current average value is larger than the overcurrent set value 1.0, the operation is carried out;
the delay characteristic is as follows: and the action is carried out after the time delay set by the fixed time delay.
9. The method for verifying low voltage protection according to claim 4, wherein: when locked-rotor protection is carried out, when the fault current is greater than the set allowable breaking current, the protection device does not trip, only alarms, and breaks the current after the current falls below the allowable breaking current;
to avoid an accidental situation, the action characteristics are set as follows: the three-phase current is not operated when the maximum value of the three-phase current is less than the locked rotation set value 0.95, and is operated when the maximum value of the three-phase current is greater than the locked rotation set value 1.0;
the delay characteristic is as follows: and the action is carried out after the time delay set by the fixed time delay.
10. The method for verifying low voltage protection according to claim 4, wherein: when the acceleration overtime protection is started, after a starting command is received, the current does not drop to the rated current within a specified time, namely below the full load current, the acceleration overtime is considered, the vehicle is stopped immediately, and the safety of the motor equipment is protected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110539481.3A CN113270849A (en) | 2021-05-18 | 2021-05-18 | Low-voltage protection calibration device and calibration method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110539481.3A CN113270849A (en) | 2021-05-18 | 2021-05-18 | Low-voltage protection calibration device and calibration method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113270849A true CN113270849A (en) | 2021-08-17 |
Family
ID=77231447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110539481.3A Pending CN113270849A (en) | 2021-05-18 | 2021-05-18 | Low-voltage protection calibration device and calibration method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113270849A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922504A (en) * | 2021-10-13 | 2022-01-11 | 深圳市永旭电气技术有限公司 | Method, system, equipment and storage medium for online intelligent monitoring and protection of alternating current load |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101207280A (en) * | 2007-11-30 | 2008-06-25 | 上海市电力公司超高压输变电公司 | Method and device of intelligent calibration for power system relay protection |
| CN201118207Y (en) * | 2007-11-02 | 2008-09-17 | 北京北斗银河科技有限公司 | Split type low-voltage motor protector |
| CN101752909A (en) * | 2010-01-15 | 2010-06-23 | 河南电力试验研究院 | Remote checking method of operation circuit |
| CN103558466A (en) * | 2013-10-29 | 2014-02-05 | 国家电网公司 | Method for on-line whole group logic calibration of 10kV protecting device |
| CN103762559A (en) * | 2013-12-31 | 2014-04-30 | 安徽鑫龙电器股份有限公司 | Low-voltage line protective device and control method thereof |
| CN105353249A (en) * | 2015-11-20 | 2016-02-24 | 国网上海市电力公司 | Automatic relay protection verification system and automatic relay protection verification method |
| CN106571618A (en) * | 2016-08-31 | 2017-04-19 | 鲁西工业装备有限公司 | High-sensitivity low-voltage motor automatic protection device and method |
| CN106781915A (en) * | 2017-01-05 | 2017-05-31 | 国家电网公司 | A kind of communication simulation plastic casing breaker device |
| CN109346389A (en) * | 2018-10-22 | 2019-02-15 | 浙江正泰电器股份有限公司 | The electronic breaker and Protection parameters custom-built system of customizable Protection parameters |
-
2021
- 2021-05-18 CN CN202110539481.3A patent/CN113270849A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201118207Y (en) * | 2007-11-02 | 2008-09-17 | 北京北斗银河科技有限公司 | Split type low-voltage motor protector |
| CN101207280A (en) * | 2007-11-30 | 2008-06-25 | 上海市电力公司超高压输变电公司 | Method and device of intelligent calibration for power system relay protection |
| CN101752909A (en) * | 2010-01-15 | 2010-06-23 | 河南电力试验研究院 | Remote checking method of operation circuit |
| CN103558466A (en) * | 2013-10-29 | 2014-02-05 | 国家电网公司 | Method for on-line whole group logic calibration of 10kV protecting device |
| CN103762559A (en) * | 2013-12-31 | 2014-04-30 | 安徽鑫龙电器股份有限公司 | Low-voltage line protective device and control method thereof |
| CN105353249A (en) * | 2015-11-20 | 2016-02-24 | 国网上海市电力公司 | Automatic relay protection verification system and automatic relay protection verification method |
| CN106571618A (en) * | 2016-08-31 | 2017-04-19 | 鲁西工业装备有限公司 | High-sensitivity low-voltage motor automatic protection device and method |
| CN106781915A (en) * | 2017-01-05 | 2017-05-31 | 国家电网公司 | A kind of communication simulation plastic casing breaker device |
| CN109346389A (en) * | 2018-10-22 | 2019-02-15 | 浙江正泰电器股份有限公司 | The electronic breaker and Protection parameters custom-built system of customizable Protection parameters |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922504A (en) * | 2021-10-13 | 2022-01-11 | 深圳市永旭电气技术有限公司 | Method, system, equipment and storage medium for online intelligent monitoring and protection of alternating current load |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2263925C2 (en) | Method and device for detecting short-circuit ground and calculating its resistance | |
| US5442335A (en) | Controller for controlling operation of at least one electrical load operating on an AC supply, and a method thereof | |
| US9000611B2 (en) | Protection techniques for an electric power system | |
| CN102340127B (en) | Digitalized comprehensive motor protector | |
| CN102263645B (en) | Power management method and power management system for communication equipment | |
| CN109428315B (en) | Self-adaptive protection method, device and system | |
| CN104638768A (en) | Intelligent power distribution security control terminal based on residential electricity consumption | |
| CN106849033B (en) | A kind of optimization method of inverter zero sequence overvoltage protection logic | |
| CN112491040B (en) | Automatic switching device for backup power line of superconducting cable and operation method thereof | |
| CN110617362A (en) | Method for detecting state of electric valve | |
| CN102332702B (en) | Intelligent real-time on-line displaying and controlling leakage protector and control method thereof | |
| CN113270849A (en) | Low-voltage protection calibration device and calibration method | |
| US20030009302A1 (en) | Method and apparatus for multi-function generator protective relay system | |
| Naik et al. | Programmable protective device for LV distribution system protection | |
| CN203589836U (en) | Intelligent control apparatus of starting signal for diesel generating set | |
| CN103869202A (en) | Transformer high-tension side phase-failure detection method and system | |
| US20090257156A1 (en) | Method of setting a ground fault trip function for a trip unit and a trip unit having a defined trip function for ground fault protection | |
| KR20180096357A (en) | IoT-based Smart Distribution Panelboard Control Apparatus for Mobile Communication | |
| KR101227537B1 (en) | Cabinet panel of built-in neutral line repair function | |
| CN103378581A (en) | AFCI comprehensive protecting device | |
| CN216215916U (en) | Power consumption protector for three-phase balance immersion electric shock prevention | |
| CN203423479U (en) | Miniature low-voltage motor integrated protection device | |
| CN102097983A (en) | Network type all-digital motor soft starter | |
| CN212343309U (en) | Motor protector based on network communication function | |
| KR20160046566A (en) | Method for controlling inverter |
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 |