CN112103914A - Protection method and device for low-voltage IT power supply system - Google Patents
Protection method and device for low-voltage IT power supply system Download PDFInfo
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- CN112103914A CN112103914A CN202011237961.6A CN202011237961A CN112103914A CN 112103914 A CN112103914 A CN 112103914A CN 202011237961 A CN202011237961 A CN 202011237961A CN 112103914 A CN112103914 A CN 112103914A
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- power supply
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- 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
- H02H3/26—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 responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—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 responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
Abstract
The invention discloses a protection method and a device for a low-voltage IT power supply system. In the application, the processors judge that the required continuous preset time is different, and the preset time corresponding to each processor connected in series from the load side to the power side is increased in sequence, so that only the protection switch which is larger than the leakage current threshold value and closest to the load side is controlled to be switched off, and the functions of controlling the protection switch to be switched off in a grading manner and controlling the protection switch close to the power side not to be switched off easily are realized. In addition, based on the mode, the leakage current preset value can be set to be smaller than the safety threshold value, and the possibility of safety accidents is reduced.
Description
Technical Field
The invention relates to the field of power supply, in particular to a protection method and a protection device for a low-voltage IT power supply system.
Background
When a single-phase grounding occurs in a low-voltage power supply system in the prior art, leakage current can be generated, and the safety of the system is threatened by the leakage current. Specifically, the power transmission line from the power supply side to the load side is sequentially connected in series with the protection switches at different levels, for example, the primary protection switch is a protection switch close to the load side and is disposed at a specific socket of a certain house, the secondary protection switch is a main switch in the house, and the tertiary protection switch is a protection switch close to the power supply side and is a main switch of a floor where the house is located. Each protection switch corresponds to a detection module and a processor, wherein the detection module detects the total leakage current of a three-phase wire and a zero line of a power output line where the corresponding protection switch is located, the processor judges whether the total leakage current detected by the detection module is larger than a preset leakage current value corresponding to the protection switch or not, and if yes, the corresponding protection switch is controlled to be switched off to ensure the safety of the system. In order to prevent the protection switches close to the power supply from being easily turned off, the operating current values (i.e., the leakage current preset values) of the protection switches in the direction from the load side to the power supply side are sequentially increased. For example, the operating current value of the primary switch is 20mA, the operating current value of the secondary protection switch is 100mA, and the operating current value of the tertiary protection switch is 200 mA. Therefore, in the prior art, in order to prevent the protection switch close to the power supply from being easily turned off, different action current values are set to control the protection switch to be turned off in a grading manner, but the action current value of the high-grade protection switch is larger and far larger than a safety threshold value, so that a safety accident (for example, a fire disaster or a threat to human safety) is easily caused.
Disclosure of Invention
The invention aims to provide a protection method and a protection device for a low-voltage IT power supply system, which realize the function of controlling a protection switch to be switched off in a grading way and preventing the protection switch close to a power supply side from being switched off easily. In addition, based on the mode, the leakage current preset value can be set to be smaller than the safety threshold value, and the possibility of safety accidents is reduced.
In order to solve the above technical problem, the present invention provides a protection method for a low-voltage IT power supply system, where the low-voltage IT power supply system includes protection switches of different levels connected in series in sequence on a transmission line from a power supply side to a load side, and each protection switch corresponds to a detection module and a processor, and the protection method is applied to each processor, and includes:
acquiring the sum of leakage currents of a three-phase lead and a zero line of a power output line at a corresponding protection switch, which is detected by a detection module corresponding to the detection module;
judging whether the sum of the leakage currents is continuously larger than a leakage current preset value within a preset time corresponding to the sum of the leakage currents;
if yes, controlling the protection switch corresponding to the protection switch to be disconnected;
if not, controlling the protection switch corresponding to the protection switch to be closed;
and the preset time corresponding to each processor along the direction from the load side to the power supply side is sequentially increased.
Preferably, the preset time corresponding to each processor along the direction from the load side to the power side increases in sequence, and includes:
and the difference between preset time corresponding to any two adjacent processors in the processors from the load side to the power side is n seconds, and the preset time corresponding to the processor closest to the power side is greater than the preset time corresponding to the processor closest to the load side.
Preferably, the method further comprises the following steps:
reading gear information adjusted by a gear adjusting module;
adjusting the preset time based on the gear information.
Preferably, the method further comprises the following steps:
receiving a closing instruction sent by an upper computer;
and controlling the corresponding protection switch to be closed based on the closing instruction.
Preferably, the method further comprises the following steps:
receiving a disconnection instruction sent by an upper computer;
and controlling the corresponding protection switch to be switched off based on the switching-off instruction.
Preferably, the method further comprises the following steps:
and sending the corresponding on or off state of the protection switch to an upper computer.
Preferably, the preset time is greater than zero.
Preferably, before determining whether the sum of the leakage currents is continuously greater than the preset leakage current value within the preset time corresponding to the sum of the leakage currents, the method further includes:
judging whether the sum of the leakage currents is larger than a safety threshold value or not; the safety threshold value is greater than the leakage current preset value;
if yes, controlling the corresponding protection switch to be switched off in a time delay way according to the national standard; the national standard delay time is less than the preset time;
if not, the step of judging whether the sum of the leakage currents is continuously larger than the preset value of the leakage currents within the corresponding preset time is carried out.
The invention also provides a protection device for the low-voltage IT power supply system, which comprises:
a memory for storing a computer program;
a processor for implementing the protection method when executing the computer program.
The application also provides a low pressure IT power supply system, include the not different rank's that establish ties in proper order protection switch, and every on the transmission line from power supply side to load side protection switch corresponds a detection module, still includes:
the protection device for the low-voltage IT power supply system corresponds to each protection switch.
The invention discloses a protection method and a device for a low-voltage IT power supply system. In the application, the processors judge that the required continuous preset time is different, and the preset time corresponding to each processor connected in series from the load side to the power side is increased in sequence, so that only the protection switch which is larger than the leakage current threshold value and closest to the load side is controlled to be switched off, and the functions of controlling the protection switch to be switched off in a grading manner and controlling the protection switch close to the power side not to be switched off easily are realized. In addition, based on the mode, the leakage current preset value can be set to be smaller than the safety threshold value, and the possibility of safety accidents is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flowchart of a protection method for a low-voltage IT power supply system according to the present invention;
fig. 2 is a block diagram of a protection device for a low-voltage IT power supply system according to the present invention.
Detailed Description
The core of the invention is to provide a protection method and a device for a low-voltage IT power supply system, which realize the function of controlling the protection switch to be switched off in a grading way and preventing the protection switch close to the power supply side from being switched off easily. In addition, based on the mode, the leakage current preset value can be set to be smaller than the safety threshold value, and the possibility of safety accidents is reduced.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
Referring to fig. 1, fig. 1 is a flowchart of a protection method for a low-voltage IT power supply system according to the present invention, where the low-voltage IT power supply system includes protection switches of different levels serially connected in sequence on a transmission line from a power supply side to a load side, and each protection switch corresponds to a detection module and a processor, and the protection method is applied to each processor, and includes:
s11: acquiring the sum of leakage currents of a three-phase lead and a zero line of a power output line at a corresponding protection switch, which is detected by a detection module corresponding to the detection module;
s12: judging whether the sum of the leakage currents is continuously larger than a leakage current preset value within a preset time corresponding to the sum of the leakage currents;
s13: if yes, controlling the protection switch corresponding to the protection switch to be disconnected;
s14: if not, controlling the protection switch corresponding to the protection switch to be closed;
and the preset time corresponding to each processor along the direction from the load side to the power supply side is sequentially increased.
In order to prevent the protection switch close to the power supply side from being easily disconnected, that is, the important protection switch from being easily disconnected in the prior art, when the sum of leakage currents of a three-phase wire and a zero line on a power output line from the load side to the power supply side is larger than a preset leakage current value, the action current values (that is, preset leakage current values) of the protection switches along the direction from the load side to the power supply side are sequentially increased. However, the operating current value of the high-level protection switch is large and much larger than the safety threshold, and a safety accident (for example, a fire or a threat to human safety) is easily generated.
Based on this, the present application first obtains the total leakage current of the three-phase wires and the zero line of the power output line from the corresponding protection switch detected by the detection module, then judges whether the total leakage current is continuously greater than the preset leakage current value within the preset time corresponding to the detection module, if so, controls the corresponding protection switch to be opened to protect the safety of the system, if not, controls the corresponding protection switch to be kept closed, in the present application, the preset time corresponding to each processor along the direction from the load side to the power side is sequentially increased, so that the preset time corresponding to the processor closest to the load side is the shortest, when the leakage current is detected, the processor closest to the load side first controls the corresponding protection switch to be opened, after the protection switch closest to the load side is opened, the detection module except the processor closest to the load side cannot detect the leakage current, that is the processor closest to the load side does not continuously detect the leakage current within the preset time, the corresponding protection switch does not have to be opened. According to the method and the device, the processors corresponding to the protection switches of different levels are set to have different preset times, so that the protection switches are disconnected in a grading manner, the important protection switches are not disconnected easily, and the reliability of power supply is ensured. In addition, based on the mode, the leakage current preset values corresponding to the processors are the same, and the leakage current preset values can be set to be smaller than the safety threshold, so that the action currents of the protection switches, namely the sum of the leakage currents is smaller, and the possibility of safety accidents is reduced.
Specifically, for example, three stages of protection switches, namely, a primary protection switch, a secondary protection switch and a tertiary protection switch, are arranged from the load side to the power side, and the preset time corresponding to the respective processors is sequentially 1 second, 2 seconds and 3 seconds, when the power line at the primary protection switch is grounded in a single phase, the detection module corresponding to the primary protection switch detects the sum of leakage current and the corresponding processor judges that the sum of leakage current is greater than the preset value of leakage current, the detection modules corresponding to the secondary protection switch and the tertiary protection switch respectively detect the same sum of leakage current, at this time, the processor corresponding to the primary protection switch controls the primary protection switch to be turned off after 1 second, the processor corresponding to the secondary protection switch does not reach the preset time (i.e., 2 seconds), the primary protection switch is turned off, and after 1 second, the detection modules corresponding to the secondary protection switch and the tertiary protection switch do not detect the sum of leakage current, that is, the corresponding processor does not continuously detect that the sum of the leakage currents is larger than the preset value of the leakage current within 3 seconds after 2 seconds, and the function that the protection switch close to the power supply side is not easily disconnected is achieved.
In addition, the low-voltage power supply system is an IT system, if single-phase or zero-line grounding occurs at the moment, the sum of generated leakage currents is about several milliamperes to dozens of milliamperes, the sum of the generated leakage currents is relatively small, although safety problems such as human body electric shock cannot occur, certain potential safety hazards also exist, the preset value of the leakage currents can be set to be a specific value between 0.5mA and 5mA at the moment, and therefore when the detection module detects a small sum of the leakage currents, the corresponding protection switches can be controlled to be switched off to eliminate the potential safety hazards, and the application range of the IT system is expanded. In addition, in consideration of the fact that important switches are not easy to trip, the preset time corresponding to the processor corresponding to the high-level protection switch may be set to be longer (e.g., 0.5 hour to 2 hours), and the preset time corresponding to the processor corresponding to the highest-level protection switch may be set to be permanent.
In summary, in the present application, the processors determine that the required duration of the preset time is different, and the preset time corresponding to each processor connected in series from the load side to the power side is sequentially increased, so that only the protection switch whose total leakage current is greater than the leakage current threshold and closest to the load side is controlled to be turned off, thereby implementing the function of controlling the protection switch to be turned off in stages and the protection switch close to the power side not to be turned off easily. In addition, based on the mode, the leakage current preset value can be set to be smaller than the safety threshold value, and the possibility of safety accidents is reduced.
On the basis of the above-described embodiment:
as a preferred embodiment, the sequentially increasing of the preset time for each processor in the direction from the load side to the power supply side includes:
the preset time difference between any two adjacent processors in each processor along the direction from the load side to the power supply side is n seconds, and the preset time corresponding to the processor closest to the power supply side is greater than the preset time corresponding to the processor closest to the load side.
Specifically, the difference between the preset time corresponding to any two processors in the present application is n seconds, and the preset time corresponding to each processor in the direction from the load side to the power side increases in sequence, that is, the preset time corresponding to the processor closest to the power side in the two processors is greater than the preset time corresponding to the processor closest to the load side. In addition, n is not less than 0.2, n is 0.5 in this embodiment, and may be other values, which is not limited in this application.
As a preferred embodiment, the method further comprises the following steps:
reading gear information adjusted by a gear adjusting module;
and adjusting the preset time based on the gear information.
Specifically, the preset time in the application is determined by the gear adjusting module, each processor corresponds to one gear adjusting module, the gear adjusting module adjusts the preset time corresponding to the corresponding processor, each processor reads the gear information adjusted by the corresponding gear adjusting module, and then each processor adjusts the preset time based on the gear adjustment.
The gear adjusting module may be, but not limited to, a rotary encoder switch, and may also be other modules having a gear adjusting function, and the application is not limited herein.
As a preferred embodiment, the method further comprises the following steps:
receiving a closing instruction sent by an upper computer;
and controlling the corresponding protection switch to be closed based on the closing instruction.
The protection switch that the treater control corresponds breaks down after, after the staff troubleshooting, makes things convenient for the staff online control to close, and the treater of this application still establishes to be connected with the host computer through communication module, and when the protection switch need be closed, the host computer sends the closure instruction to the treater that corresponds, and the treater is closed based on the protection switch that the closure instruction control corresponds.
As a preferred embodiment, the method further comprises the following steps:
receiving a disconnection instruction sent by an upper computer;
and controlling the corresponding protection switch to be switched off based on the switching-off instruction.
Considering that there may be a situation that a certain switch needs to be turned off, such as adjustment of a power transmission line or turning off of a protection switch according to the actual situation of the current electrical load, the processor in the present application is further configured to receive a turn-off instruction sent by the upper computer, and when the protection switch needs to be controlled to be turned off, send the turn-off instruction to the corresponding processor, and the processor controls the corresponding protection switch to be turned off.
As a preferred embodiment, the method further comprises the following steps:
and sending the on or off state of the corresponding protection switch to an upper computer.
In order that the staff can timely know the switch or the closed state of each protection switch, the processor in the application is also used for collecting the state of the corresponding protection switch and sending the state to the upper computer, and the upper computer can be a human-computer interface or other upper computers capable of monitoring.
In addition, when the processor controls the corresponding protection switch to be switched off, alarm information can be sent to the upper computer, so that a worker can know the state of the protection switch in time and process the state in time, the alarm information can be sound alarm and/or light alarm, and can also be alarm information in other forms, and the application is not limited in particular.
As a preferred embodiment, the preset time is greater than zero.
Specifically, when the low voltage power supply system is the IT system, when single-phase ground connection or zero line ground connection appear, the leakage current sum of production is several milliamperes to tens of milliamperes, can not cause human electric shock or ground connection to strike an arc, can not arouse human organ injury usually yet, consider that the leakage current sum that probably the people accidentally contacts and lead to appearing, the people has the touching inductance of tingling this moment, can throw away rapidly usually, if when presetting the time and being 0 this moment, then the frequent disconnection's of protection switch phenomenon can appear. Therefore, the preset time is set to be greater than 0, that is, the preset time corresponding to the processor closest to the load side is greater than 0. In this embodiment, the preset time is set to a specific value between 5 seconds and 15 seconds, that is, when the time of the total leakage current is smaller than the specific value, it is determined that the protection switch is touched by mistake, the corresponding protection switch is kept closed, and when the time of the total leakage current is larger than the specific value, the processor controls the corresponding protection switch to be turned off. It can be seen that the present application avoids frequent opening and closing of the protection switch in this manner.
As a preferred embodiment, before determining whether the sum of the leakage currents is continuously greater than the preset leakage current value within the preset time corresponding to the sum of the leakage currents, the method further includes:
judging whether the sum of the leakage currents is greater than a safety threshold value; the safety threshold is greater than the leakage current preset value;
if yes, controlling the corresponding protection switch to be switched off in a time delay way according to the national standard; the national standard delay time is less than the preset time;
if not, the step of judging whether the sum of the leakage currents is continuously larger than the preset value of the leakage currents within the corresponding preset time is carried out.
The situation that the sum of leakage currents is larger than the leakage current preset value and larger than a safety threshold value, so that a human body is electrically shocked or a fire disaster is caused is considered. Based on this, before judging whether the leakage current sum is continuously greater than the leakage current preset value within the self-corresponding preset time, the method first judges whether the leakage current sum is greater than a safety threshold value, if so, controls the corresponding protection switch to be turned off in a delayed manner according to the national standard, and if not, enters the step of judging whether the leakage current sum is continuously greater than the leakage current preset value within the self-corresponding preset time. The safety threshold value is larger than the leakage current preset value, and the national standard delay is smaller than the preset time.
Specifically, the safety threshold in this embodiment is 30mA, and the national standard time is 0.1 second, that is, when the detection module detects that the total leakage current is greater than 30mA, the corresponding processor controls the corresponding protection switch to be turned off in a delayed manner for 0.1 second.
The condition that the sum of the leakage currents is larger than the leakage current preset value may be that the power supply line is too long and the distributed capacitance compensation fails, or two phases in three phases in the IT system or a single phase and a zero line in the IT system are grounded simultaneously, or may be a single phase ground in the TT system or the TN system, including a metal ground and a lower resistance ground, which may cause the sum of the leakage currents to be larger than the safety threshold, and which is the specific condition, is not described herein again. Normally, the sum of leakage currents of the IT system does not exceed 1000mA, but when the electric shock current of a human body reaches more than 100mA, electric shock casualties can be generated when the time exceeds 1 second. The sum of leakage currents that may cause a fire is generally 1A or more.
Referring to fig. 2, fig. 2 is a block diagram of a protection device for a low-voltage IT power supply system according to the present invention.
A protection device for a low voltage IT power supply system, comprising:
a memory 1 for storing a computer program;
the processor 2 is configured to implement the protection method when executing the computer program.
The application also provides a protection device for the low-voltage IT power supply system, and the protection device has the same beneficial effects as the protection method for the low-voltage IT power supply system described in the method embodiment, and the description of the protection device is omitted here.
The utility model provides a low pressure IT power supply system, includes the protection switch of different grades that connects in series in proper order on the transmission line from the power supply side to the load side, and every protection switch corresponds a detection module, still includes:
the protection device for the low-voltage IT power supply system corresponds to each protection switch.
The application also provides a low-voltage IT power supply system, the number of the protection switches is not particularly limited in the application, the number of the protection switches is set according to actual needs, the IT system has high power supply reliability, and the IT power supply system is usually applied to occasions such as coal mines, hospitals, ships or high-speed rails. The low-voltage IT power supply system provided by the application has the same beneficial effects as the protection method for the low-voltage IT power supply system described in the method embodiment, and the description of the application is omitted.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A protection method for a low-voltage IT power supply system, wherein the low-voltage IT power supply system comprises protection switches of different levels which are sequentially connected in series on a transmission line from a power supply side to a load side, each protection switch corresponds to a detection module and a processor, and the protection method is applied to each processor and is characterized by comprising the following steps of:
acquiring the sum of leakage currents of a three-phase lead and a zero line of a power output line at a corresponding protection switch, which is detected by a detection module corresponding to the detection module;
judging whether the sum of the leakage currents is continuously larger than a leakage current preset value within a preset time corresponding to the sum of the leakage currents;
if yes, controlling the protection switch corresponding to the protection switch to be disconnected;
if not, controlling the protection switch corresponding to the protection switch to be closed;
and the preset time corresponding to each processor along the direction from the load side to the power supply side is sequentially increased.
2. The protection method for the low-voltage IT power supply system according to claim 1, wherein the preset time corresponding to each processor in the direction from the load side to the power side is sequentially increased, comprising:
and the difference between preset time corresponding to any two adjacent processors in the processors from the load side to the power side is n seconds, and the preset time corresponding to the processor closest to the power side is greater than the preset time corresponding to the processor closest to the load side.
3. The protection method for a low voltage IT power supply system according to claim 1, further comprising:
reading gear information adjusted by a gear adjusting module;
adjusting the preset time based on the gear information.
4. The protection method for a low voltage IT power supply system according to claim 1, further comprising:
receiving a closing instruction sent by an upper computer;
and controlling the corresponding protection switch to be closed based on the closing instruction.
5. The protection method for a low voltage IT power supply system according to claim 1, further comprising:
receiving a disconnection instruction sent by an upper computer;
and controlling the corresponding protection switch to be switched off based on the switching-off instruction.
6. The protection method for a low voltage IT power supply system according to claim 1, further comprising:
and sending the corresponding on or off state of the protection switch to an upper computer.
7. The protection method for a low-voltage IT power supply system according to claim 1, characterized in that said preset time is greater than zero.
8. The protection method for the low-voltage IT power supply system according to any of the claims 1-7, further comprising, before determining whether the sum of the leakage currents is continuously greater than the preset value of the leakage current within a corresponding preset time, the method further comprising:
judging whether the sum of the leakage currents is larger than a safety threshold value or not; the safety threshold value is greater than the leakage current preset value;
if yes, controlling the corresponding protection switch to be switched off in a time delay manner according to the national standard; the national standard delay time is less than the preset time;
if not, the step of judging whether the sum of the leakage currents is continuously larger than the preset value of the leakage currents within the corresponding preset time is carried out.
9. A protection device for a low-voltage IT power supply system, comprising:
a memory for storing a computer program;
a processor for implementing the protection method of any one of claims 1 to 8 when executing the computer program.
10. The utility model provides a low pressure IT power supply system, includes the protection switch of different grades that connects in series in proper order on the transmission line from the power supply side to the load side, and every the protection switch corresponds a detection module, ITs characterized in that still includes:
a protection device for a low voltage IT power supply system according to claim 9 corresponding to each of said protection switches.
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Cited By (1)
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| CN114442515A (en) * | 2021-10-14 | 2022-05-06 | 创泽智能机器人集团股份有限公司 | Power supply control device of robot |
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| CN107769156A (en) * | 2016-08-18 | 2018-03-06 | 中国电力科学研究院 | A kind of method of achievable equipment safety adaptive guard action |
| CN207530532U (en) * | 2017-09-21 | 2018-06-22 | 贵州开磷集团股份有限公司 | Classification timesharing limit RCD circuits in a kind of IT nets |
| CN208656407U (en) * | 2018-05-14 | 2019-03-26 | 国电龙源电气有限公司 | The protection system for preventing mediate contact from getting an electric shock |
| CN109818423A (en) * | 2019-04-08 | 2019-05-28 | 国网福建省电力有限公司 | A kind of intelligent O&M distribution system based on management mode of taking the initiative in offering a hand |
| CN111525496A (en) * | 2020-06-04 | 2020-08-11 | 广东电网有限责任公司 | Method for carrying out graded leakage protection on residential area |
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| CN114442515A (en) * | 2021-10-14 | 2022-05-06 | 创泽智能机器人集团股份有限公司 | Power supply control device of robot |
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