CN115663775A - Three-phase sequence intelligent monitoring protection device - Google Patents
Three-phase sequence intelligent monitoring protection device Download PDFInfo
- Publication number
- CN115663775A CN115663775A CN202211321620.6A CN202211321620A CN115663775A CN 115663775 A CN115663775 A CN 115663775A CN 202211321620 A CN202211321620 A CN 202211321620A CN 115663775 A CN115663775 A CN 115663775A
- Authority
- CN
- China
- Prior art keywords
- phase
- module
- power supply
- cpu control
- control module
- 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
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention belongs to the technical field of power system protection, and aims to provide a three-phase sequence intelligent monitoring protection device which is mainly used for protecting a three-phase load connected with a three-phase power supply. The three-phase sequence intelligent monitoring protection device comprises: the phase sequence detection module, the over-under voltage detection module, the over-current detection module, the phase failure detection module, the electric leakage detection module, the CPU control module, the liquid crystal display module, the sound-light alarm module, the work indication module, the relay execution module and the local power supply module. When the three-phase power supply generates a reverse sequence, the CPU control module controls the selective attraction of an internal relay of the relay execution module to automatically adjust a three-phase sequence so as to protect the safety of the three-phase load connected with the three-phase power supply. In addition, the invention can effectively realize over-under voltage protection, over-current protection, open-phase protection and leakage protection of the three-phase load by setting the organic combination of the modules, and has higher digitalization and intelligentization level.
Description
Technical Field
The invention relates to the technical field of power system equipment and power system protection, in particular to a three-phase sequence intelligent monitoring protection device.
Background
With the progress of society and the continuous improvement of the living standard of people, the requirements of users on the safety and reliability of power supply are higher and higher. Especially, three-phase loads are mostly operated in an industrial control system, and for some special electromechanical devices, such as an elevator, a central air conditioner, a traveling crane, a liquid cooling unit, a three-phase motor and the like, the phase sequence of a three-phase power supply of a user side can be accurately judged so as to ensure the normal operation of the three-phase power load, and once the phase sequence is reversely connected, accidents or equipment damage can be easily caused.
The phase sequence protector in the market at present can only monitor and protect the reverse sequence or monitor and protect the reverse sequence and the over-under voltage at the same time, and a phase sequence protector which can also protect the phase loss, the electric leakage and the over-current is not available, in particular to a three-phase sequence protector which can accurately detect the three-phase sequence and automatically adjust the three-phase sequence. Even if the protection function can be realized by matching with devices such as a circuit breaker, a relay, a contactor and the like, the purpose of intelligent protection cannot be achieved. The defects are as follows: firstly, once a phase sequence error occurs, the equipment cannot normally operate, maintenance personnel must arrive at a field for overhauling, and the equipment can recover to normally work. Even if a reasonable and effective technology (patent 1 201620251724.8, patent 2 201922085309.6) is adopted to solve the problem of phase sequence automatic adjustment, the function is single, and the type of reverse sequence cannot be judged, such as phase sequence BAC, phase sequence CBA or phase sequence ACB. Secondly, it is impossible to detect what kind of phase is lacking, for example, lacking a phase, lacking B phase, lacking C phase, or lacking two phases, which causes a certain difficulty in maintenance. And thirdly, the phase sequence of the three-phase power supply cannot be accurately adjusted after being detected.
In order to solve the above problems, the three-phase power system can better achieve reliable operation, save cost, and perform real-time monitoring and protection on the phase sequence, phase loss, over-under voltage, over-current, and leakage of the three-phase power source, an intelligent monitoring and protection device for the three-phase sequence is specially designed to alleviate the above technical problems to be solved urgently.
It is noted that this section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
The invention content is as follows:
in order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
the utility model provides a three-phase sequence intelligent monitoring protection device, is applied to the three-phase power supply who is connected with three-phase load, mainly is used for protecting the three-phase load who is connected with three-phase power supply. The three-phase sequence intelligent monitoring protection device comprises: the phase sequence detection module, the over-under voltage detection module, the over-current detection module, the phase failure detection module, the electric leakage detection module, the CPU control module, the liquid crystal display module, the sound-light alarm module, the work indication module, the relay execution module and the local power supply module.
The input ends of the phase sequence detection modules are connected with the three-phase power supply respectively, and the output ends of the phase sequence detection modules are connected with the I/O input ports of the CPU control module respectively; the input ends of the over-under voltage detection modules are connected with the three-phase power supply respectively, and the output ends of the over-under voltage detection modules are connected with the I/O input ports of the CPU control module respectively; the input ends of the overcurrent modules are connected with the three-phase power supply respectively, and the output ends of the overcurrent modules are connected with the I/O input port of the CPU control module; the input ends of the open-phase detection modules are connected with the three-phase power supply respectively, and the output ends of the open-phase detection modules are connected with the I/O input ports of the CPU control module respectively; the input end of the electric leakage detection module is connected with the three-phase power supply, and the output end of the electric leakage detection module is connected with the I/O input port of the CPU control module; the input end of the liquid crystal display module is connected with the I/O output port of the CPU control module; the input end of the sound-light alarm module is connected with the I/O output port of the CPU control module; the input end of the work indication module is connected with the I/O output port of the CPU control module; the input ends of the relay execution modules are connected with the three-phase power supply respectively, the output ends of the relay execution modules are connected with the three-phase load respectively, and the control ends of the relay execution modules are connected with the I/O output ports of the CPU control module respectively.
In a preferred embodiment of the present invention, in the above three-phase sequence intelligent monitoring protection device, four signal input ends of the phase sequence detection module are respectively connected to the first phase, the second phase, the third phase and the neutral line N of the three-phase power supply, three signal output ends are respectively connected to the I/O input port of the CPU control module, the phase sequence detection module detects a phase sequence signal obtained by detecting the phase sequence of the three-phase power supply as a sampling signal, the CPU control module determines whether the phase sequence of the three-phase power supply is inverted according to the sampling signal and a preset phase sequence corresponding relationship, and controls the relay execution module to adjust a connection manner between the three-phase power supply and the three-phase load when the phase sequence is inverted, so that power supplied to the three-phase load is always in a positive sequence state.
In a preferred embodiment of the present invention, in the above three-phase sequence intelligent monitoring protection device, four input terminals of the phase sequence detection module are respectively connected to the a phase, the B phase, the C phase and the neutral line N of the three-phase power supply, three signal output ports are respectively named as PS0, PS1 and PS2, and each signal line has two states, i.e., 0 or 1. In the working process, the CPU control module can judge whether the three-phase power supply is in a reverse order according to the state changes of the three signal wires PS0, PS1 and PS 2. The state table of its implementation is as follows:
in a preferred embodiment of the present invention, in the above three-phase sequence intelligent monitoring protection device, four input terminals of the over-under voltage module are respectively named as UA1, UB1, UC1, and N, and three output terminals are respectively named as UA2, UB2, and UC2. In the working process, the CPU control module judges whether the three-phase power supply is in an overvoltage, undervoltage or normal working voltage range by detecting the voltage changes of three signal lines UA2, UB2 and UC2. The specific judgment is as follows: when a signal voltage in UA2, UB2 and UC2 is greater than a first preset value, determining that the signal voltage is an overvoltage; when one signal voltage in UA2, UB2 and UC2 is smaller than a second preset value, determining that the signal voltage is under-voltage; and when the CPU control module detects that one signal in UA2, UB2 and UC2 is overvoltage and/or undervoltage, the CPU control module controls the relay execution module to disconnect the connection between the three-phase power supply and the three-phase load.
In addition, an overvoltage recovery value and an undervoltage recovery value are further arranged inside the CPU control module, and when the CPU control module detects that the overvoltage signal and/or the undervoltage signal are recovered to the recovery value range, the connection between the three-phase power supply and the three-phase load is automatically communicated after 3 seconds.
In a preferred embodiment of the present invention, in the three-phase-sequence intelligent monitoring protection device, three signal input terminals of the over-current module are named as IA1, IB1, IC1, and N, respectively, and three signal output terminals are named as IA2, IB2, and IC2, respectively. The CPU control module judges the current state of the three-phase power supply by detecting the current changes of three signal lines IA2, IB2 and IC2 in the working process, and when the CPU control module detects that the current state of one signal of IA2, IB2 and IC2 is larger than a preset value range, namely the current is judged to be over-current, the CPU control module controls the relay execution module to disconnect the three-phase power supply and the three-phase load.
In addition, an overcurrent return value is further arranged inside the CPU control module, and when the CPU control module detects that the overcurrent returns to the preset value range, the connection between the three-phase power supply and the three-phase load is automatically communicated after 3 seconds.
It should be reminded that the current preset value range and the waiting time of 3 seconds are not fixed and can be set by a program according to the actual work.
In a preferred embodiment of the present invention, in the three-phase sequence intelligent monitoring protection device, four signal input ends of the open-phase detection module are respectively connected to the a-phase, the B-phase, the C-phase and the neutral line N of the three-phase power supply, three signal output ends are respectively named as PA0, PA1 and PA2, and each signal line has two states of 0 or 1. In the working process, the CPU control module may determine whether the three-phase power supply is open-phase according to changes in states of three signal lines PA0, PA1, and PA2, and if it is determined that the three-phase power supply is open-phase, control the relay execution module to disconnect the connection between the three-phase power supply and the three-phase load. The state table of its implementation is as follows:
in a preferred embodiment of the present invention, in the above three-phase-sequence intelligent monitoring protection device, the leakage detecting module is composed of a separate electronic component, and when the leakage is detected, the connection between the three-phase power supply and the three-phase load is disconnected.
In a preferred embodiment of the present invention, in the above three-phase sequence intelligent monitoring protection device, the liquid crystal display module is configured to receive and display a phase sequence state, a voltage state, a current state, a phase-missing state, and a leakage state of a three-phase power source sent by the CPU control module.
In a preferred embodiment of the present invention, in the above three-phase sequence intelligent monitoring protection device, the sound and light alarm module is composed of a separate electronic component, and when detecting over-under voltage, over-current, reverse sequence and phase loss, a sound and light alarm is given out to prompt the staff to perform further processing. It should be noted that the sound and light alarm module is further provided with a manual cutting alarm button, so that a worker can conveniently cut off the alarm manually after knowing the alarm state, and noise pollution caused by the sound and light alarm module is avoided.
In a preferred embodiment of the present invention, in the three-phase sequence intelligent monitoring protection device, the working indication module includes a plurality of indicator lights, each of the indicator lights is connected to the CPU control module, and the phase sequence detection module, the over-under voltage detection module, the over-current detection module, the open-phase detection module, and the leakage detection module correspond to at least one indicator light respectively.
In a preferred embodiment of the present invention, in the above three-phase-sequence intelligent monitoring protection device, the relay execution module includes four relays, which are named as a first relay, a second relay, a third relay, and a fourth relay. When the phase sequence detection module detects that the phase sequence of the three-phase power supply is a positive sequence, the CPU control module controls a first relay of the relay execution module to attract; when the phase sequence detection module detects that the phase sequence of the three-phase power supply is in a reverse sequence state A, C and B, the CPU control module controls a second relay of the relay execution module to suck so as to automatically adjust the phase sequence; when the phase sequence detection module detects that the phase sequence of the three-phase power supply is in a reverse sequence state C, A and B, the CPU control module controls a third relay of the relay execution module to suck so as to automatically adjust the phase sequence; and when the phase sequence detection module detects that the phase sequence of the three-phase power supply is in a reverse sequence state B, A and C, the CPU control module controls a fourth relay of the relay execution module to suck so as to automatically adjust the phase sequence. It should be noted that the first relay, the second relay, the third relay and the fourth relay of the relay execution module are already interlocked internally through the auxiliary normally closed contact, so as to effectively avoid the inter-phase short circuit that may be caused.
In a preferred embodiment of the present invention, in the above three-phase sequence intelligent monitoring protection device, the CPU control module adopts a single chip microcomputer of an embedded chip STM 32.
The invention can achieve the following beneficial effects:
(1) The invention provides a three-phase sequence intelligent monitoring protection device, which not only comprehensively improves the scientific level of a low-voltage power system protection device, but also lays a foundation for the development of functions of digitalization, intellectualization and the like of a phase sequence protector, and has wide practicability for the industry of low-voltage power system protectors.
(2) The invention provides a three-phase sequence intelligent monitoring protection device which is strong in anti-interference performance, reliable in work, low in cost and convenient to use.
(3) The three-phase sequence intelligent monitoring protection device provided by the invention has the functions of over-voltage and under-voltage protection, over-current protection, reverse sequence protection, open-phase protection and electric leakage protection. The phase sequence detection module, the over-under voltage detection module, the over-current detection module, the phase-missing detection module, the electric leakage detection module, the relay execution module, the sound-light alarm module and the work indication module are arranged, so that when the CPU control module can obtain a phase sequence state according to the phase sequence detected by the phase sequence detection module, a voltage state according to the voltage detected by the over-under voltage detection module, a current state according to the current detected by the over-current detection module, a three-phase state according to the three phases detected by the phase-missing detection module and a residual current state according to the residual current detected by the electric leakage detection module are abnormal, the relay execution module is controlled to disconnect the connection between the three-phase power supply and the three-phase load, the alarm module is controlled to send out an alarm signal, and the collected information is sent to the liquid crystal display module to be displayed.
(4) The invention provides a three-phase sequence intelligent monitoring protection device which can accurately detect the change of a three-phase sequence, a CPU control module controls a switch corresponding to a relay execution module to be closed according to the detected phase sequence state, so that the automatic correction of the phase sequence is realized, the interlocking is realized by utilizing auxiliary contacts of a relay, the short circuit is prevented from occurring during the error correction of the phase sequence, no external equipment is required to be added, and the three-phase sequence intelligent monitoring protection device is high in digitization and intelligence.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Description of the drawings:
in order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention, and for those skilled in the art, other related drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a structural block diagram of a three-phase sequence intelligent monitoring protection device provided in an embodiment of the present invention.
Fig. 2 is a protection schematic diagram of a three-phase sequence intelligent monitoring protection device according to an embodiment of the present invention.
Fig. 3 is an application schematic diagram of a three-phase sequence intelligent monitoring protection device provided by an embodiment of the present invention.
Fig. 4 is a pin diagram of a relay execution module according to an embodiment of the present invention.
Fig. 5 is a schematic application diagram of a relay execution module according to an embodiment of the present invention.
Fig. 6 is an application schematic diagram of a relay execution module according to an embodiment of the present invention.
Fig. 7 is a pin diagram of a CPU control module according to an embodiment of the present invention.
Icon: 100-three-phase sequence intelligent monitoring protection device; 110-phase sequence detection module; 120-over under voltage detection module; 130-overcurrent detection module; 140-phase loss detection module; 150-leakage detection module; 160-CPU control module; 170-liquid crystal display module; 180-acousto-optic alarm module; 190-a work indication module; 200-a relay execution module; 210-a local power supply module; 300-three phase power supply; 400-three phase load.
The specific implementation mode is as follows:
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 embodiments of the present invention, but not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the 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. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the following, a detailed description of a specific embodiment of the present invention will be given with reference to fig. 1 and examples, but the present invention is not limited to the following examples.
In the present invention, for convenience of description, a description of the relative position relationship of each component in a three-phase sequence intelligent monitoring protection device is described according to the layout mode of fig. 1, for example: the positional relationship of up, down, left, right, etc. is determined in accordance with the layout direction of fig. 1 of the specification.
Referring to fig. 1, 2 and 3, the present invention provides an intelligent monitoring and protecting device 100 for three-phase sequence, which is applied to a three-phase power supply 300 connected to a three-phase load 400, wherein when the three-phase power supply 300 has a reverse sequence, a CPU control module 160 controls selective actuation of an internal relay of a relay execution module 200 to automatically adjust the three-phase sequence to protect the three-phase load 400 connected to the three-phase power supply 300.
The three-phase sequence intelligent monitoring protection device comprises: the phase sequence detection module 110, the over-under voltage detection module 120, the over-current detection module 130, the open-phase detection module 140, the electric leakage detection module 150, the CPU control module 160, the liquid crystal display module 170, the audible and visual alarm module 180, the work indication module 190, the relay execution module 200, and the local power supply module 210.
The input ends of the phase sequence detection module 110 are connected to the three-phase power supply 300, and the output ends are connected to the I/O input ports of the CPU control module 160; the input ends of the over/under voltage detection module 120 are connected to the three-phase power supply 300, and the output ends are connected to the I/O input ports of the CPU control module 160; the input end of the over-current module 130 is connected to each of the three-phase power supplies 300, and the output end is connected to the I/O input port of the CPU control module 160; the input ends of the open-phase detection module 140 are connected to the three-phase power supply 300, and the output ends are connected to the I/O input ports of the CPU control module 160; the input end of the leakage detection module 150 is connected to the three-phase power supply 300, and the output end is connected to the I/O input port of the CPU control module 160; the input end of the liquid crystal display module 170 is connected to the I/O output port of the CPU control module 160; the input end of the sound and light alarm module 180 is connected with the I/O output port of the CPU control module 160; the input end of the work indication module 190 is connected with the I/O output port of the CPU control module 160; the relay execution module 200 has a plurality of input terminals respectively connected to the three-phase power supply 300, a plurality of output terminals respectively connected to the three-phase load 400, and a plurality of control terminals respectively connected to the I/O output ports of the CPU control module 160.
In a preferred embodiment of the present invention, in the above-mentioned three-phase sequence intelligent monitoring protection device 100, four signal input ends of the phase sequence detection module 110 are respectively connected to the first phase, the second phase, the third phase and the neutral line N of the three-phase power supply 300, three signal output ends are respectively connected to the I/O input port of the CPU control module 160, the phase sequence signal obtained by detecting the phase sequence of the three-phase power supply 300 by the phase sequence detection module 110 is a sampling signal, the CPU control module 160 determines whether the phase sequence of the three-phase power supply 300 is in a reverse sequence according to the sampling signal and a preset phase sequence corresponding relationship, and controls the relay execution module 200 to adjust a connection manner between the three-phase power supply 300 and the three-phase load 400 in the reverse sequence, so that power supplied to the three-phase load 400 is always in a positive sequence state.
In a preferred embodiment of the present invention, in the above-mentioned three-phase sequence intelligent monitoring and protecting device 100, four input terminals of the phase sequence detecting module 110 are respectively connected to the a-phase, B-phase, C-phase and neutral line N of the three-phase power supply 300, three signal output ports are respectively named as PS0, PS1 and PS2, and are connected to the I/O input terminal of the CPU control module 160, and each signal line has two states of 0 or 1. In the process of operation, the CPU control module 160 may determine whether the three-phase power supply 300 is in the reverse order according to the state changes of the three signal lines PS0, PS1, and PS 2. The state table of the implementation is as follows:
in a preferred embodiment of the present invention, in the three-phase sequence intelligent monitoring protection device 100, four input terminals of the over-voltage/under-voltage module 120 are respectively named as UA1, UB1, UC1, and N, and three output terminals are respectively named as UA2, UB2, and UC2, and are connected to an I/O input terminal of the CPU control module 160, and in a working process, the CPU control module 160 determines whether the three-phase power supply 300 is in an over-voltage, under-voltage, or normal working voltage range by detecting changes in line voltages of three signal lines UA2, UB2, and UC2. The specific judgment is as follows: when one signal voltage in UA2, UB2 and UC2 is greater than a first preset value, judging that the signal voltage is overvoltage; when a signal voltage in UA2, UB2 and UC2 is smaller than a second preset value, judging that the signal voltage is under-voltage; when the CPU control module 160 detects that one of UA2, UB2, and UC2 has an over-voltage signal and/or an under-voltage signal, the relay execution module 200 is controlled to disconnect the three-phase power supply 300 and the three-phase load 400.
In addition, an overvoltage recovery value and an undervoltage recovery value are further set inside the CPU control module 160, and when the CPU control module 160 detects that the overvoltage signal and/or the undervoltage signal are recovered within the range of the overvoltage recovery value and/or the undervoltage recovery value, the connection between the three-phase power supply 300 and the three-phase load 400 is automatically connected after waiting 3 seconds.
In a preferred embodiment of the present invention, in the three-phase-sequence intelligent monitoring and protecting device 100, three signal input terminals of the over-current module 130 are respectively named as IA1, IB1, IC1, and N, and three signal output terminals are respectively named as IA2, IB2, and IC2, and are connected to an I/O input terminal of the CPU control module 160, during operation, the CPU control module 160 determines a current state of the three-phase power supply 300 by detecting a change in current of three signal lines IA2, IB2, and IC2, and when the CPU control module 160 detects that one signal current state of IA2, IB2, and IC2 is greater than a preset value range, that is, it determines that the current is over-current, the relay execution module 200 is controlled to disconnect the connection between the three-phase power supply 300 and the three-phase load 400.
In addition, an overcurrent recovery value is further set inside the CPU control module 160, and when the CPU control module 160 detects that the overcurrent is recovered to the preset value range, the connection between the three-phase power supply 300 and the three-phase load 400 is automatically connected after waiting 3 seconds.
It should be reminded that the current preset value range and the waiting time for 3 seconds are not fixed and can be set by a program according to actual work.
In a preferred embodiment of the present invention, in the three-phase sequence intelligent monitoring protection device 100, four signal input ends of the open-phase detection module 140 are respectively connected to the a-phase, the B-phase, the C-phase and the neutral line N of the three-phase power supply 300, three signal output ends are respectively named as PA0, PA1 and PA2, and are connected to the I/O input end of the CPU control module 160, and each signal line has two states of 0 or 1. In the working process, the CPU control module 160 may determine whether the three-phase power supply 300 is open-phase according to the state changes of the three signal lines PA0, PA1, and PA2, and if it is determined that the three-phase power supply 300 is open-phase, control the relay execution module 200 to disconnect the three-phase power supply 300 from the three-phase load 400. The state table of its implementation is as follows:
in the above-mentioned three-phase-sequence intelligent monitoring and protection device 100, the leakage detecting module 150 is composed of a separate electronic component, and when the leakage is detected, the connection between the three-phase power source 300 and the three-phase load 400 is disconnected.
In a preferred embodiment of the present invention, in the three-phase sequence intelligent monitoring protection device 100, the liquid crystal display module 170 is configured to receive and display the phase sequence state, the voltage state, the current state, the phase failure state and the leakage state of the three-phase power source 300 sent by the CPU control module 160.
In the preferred embodiment of the present invention, in the above-mentioned three-phase sequence intelligent monitoring and protecting device 100, the sound and light alarm module 180 is composed of separate electronic components, and when detecting an over-voltage, an over-current, a reverse sequence and a phase loss, a sound and light alarm is given out to prompt the staff to perform further processing. It should be noted that the sound and light alarm module 180 is further provided with a manual cutting alarm button, so that a worker can manually cut an alarm after knowing an alarm state, and noise pollution caused by the sound and light alarm module 180 is avoided.
In a preferred embodiment of the present invention, in the three-phase sequence intelligent monitoring protection device 100, the working indication module 190 includes a plurality of indicator lights, each of the indicator lights is connected to the CPU control module 160, and the phase sequence detection module 110, the over-under voltage detection module 120, the over-current detection module 130, the open-phase detection module 140, and the leakage detection module 150 respectively correspond to at least one indicator light.
Referring to fig. 4, 5 and 6, in the above-mentioned three-phase sequence intelligent monitoring and protecting apparatus 100, in a preferred embodiment of the present invention, the relay execution module 200 includes four relays, which are respectively named as a first relay KM1, a second relay KM2, a third relay KM3 and a fourth relay KM4. When the phase sequence detection module 110 detects that the phase sequence of the three-phase power supply 300 is a positive sequence, the CPU control module 160 controls the first relay KM1 of the relay execution module 200 to pull in; when the phase sequence detection module 110 detects that the phase sequence of the three-phase power supply 300 is in the reverse sequence states a, C and B, the CPU control module 160 controls the second relay KM2 of the relay execution module 200 to pull in, so as to automatically adjust the phase sequence; when the phase sequence detection module 110 detects that the phase sequence of the three-phase power supply 300 is in the reverse sequence states C, a and B, the CPU control module 160 controls the third relay KM3 of the relay execution module 200 to pull in, so as to automatically adjust the phase sequence; when the phase sequence detection module 110 detects that the phase sequence of the three-phase power supply 300 is in the reverse sequence states B, a, and C, the CPU control module 160 controls the fourth relay KM4 of the relay execution module 200 to pull in, so as to automatically adjust the phase sequence. It should be noted that the first relay KM1, the second relay KM2, the third relay KM3, and the fourth relay KM4 of the relay execution module 200 are already interlocked through an auxiliary normally closed contact inside, so as to effectively avoid a possible inter-phase short circuit.
Referring to fig. 7, in the preferred embodiment of the present invention, in the three-phase sequence intelligent monitoring and protecting device 100, the CPU control module 160 is an integrated circuit chip with signal processing capability. May be a general purpose Processor including a Central Processing Unit (CPU), a Network Processor (NP), and the like. But may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The general purpose processor may be a microprocessor, any conventional processor, etc. In this embodiment, the CPU control module 160 is a single chip microcomputer. Specifically, the CPU control module 160 is a single chip microcomputer using an embedded chip STM 32.
The system is characterized in that:
it is to be noted that the term "comprises," "comprising," or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, 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, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a" \8230; "does not exclude the presence of additional like elements in a process, article, or device that comprises the element.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a three-phase sequence intelligent monitoring protection device, is applied to the three-phase power supply who is connected with three-phase load, mainly is used for protecting the three-phase load who is connected with three-phase power supply. The three-phase sequence intelligent monitoring protection device comprises: the phase sequence detection module, the over-under voltage detection module, the over-current detection module, the phase failure detection module, the electric leakage detection module, the CPU control module, the liquid crystal display module, the sound-light alarm module, the work indication module, the relay execution module and the local power supply module. The input ends of the phase sequence detection modules are connected with the three-phase power supply respectively, and the output ends of the phase sequence detection modules are connected with the I/O input ports of the CPU control module respectively; the input ends of the over-under voltage detection modules are connected with the three-phase power supply respectively, and the output ends of the over-under voltage detection modules are connected with the I/O input ports of the CPU control module respectively; the input ends of the overcurrent modules are connected with the three-phase power supply respectively, and the output ends of the overcurrent modules are connected with the I/O input port of the CPU control module; the input ends of the open-phase detection modules are connected with the three-phase power supply respectively, and the output ends of the open-phase detection modules are connected with the I/O input ports of the CPU control module respectively; the input end of the electric leakage detection module is connected with the three-phase power supply, and the output end of the electric leakage detection module is connected with the I/O input port of the CPU control module; the input end of the liquid crystal display module is connected with the I/O output port of the CPU control module; the input end of the sound-light alarm module is connected with the I/O output port of the CPU control module; the input end of the work indication module is connected with the I/O output port of the CPU control module; the input ends of the relay execution modules are connected with the three-phase power supply respectively, the output ends of the relay execution modules are connected with the three-phase load respectively, and the control ends of the relay execution modules are connected with the I/O output ports of the CPU control module respectively.
2. The intelligent monitoring and protection device for three-phase sequence as claimed in claim 1, wherein: the signal input end of the phase sequence detection module is four and is respectively connected with a first phase, a second phase, a third phase and a neutral line N of the three-phase power supply, the signal output end of the phase sequence detection module is three and is respectively connected with an I/O input port of the CPU control module, the phase sequence detection module detects that a phase sequence signal obtained by the phase sequence of the three-phase power supply is a sampling signal, the CPU control module judges whether the phase sequence of the three-phase power supply is in a reverse sequence or not according to the sampling signal and a preset phase sequence corresponding relation, and controls the relay execution module to adjust a connection mode between the three-phase power supply and the three-phase load when the phase sequence is in the reverse sequence, so that power supply to the three-phase load is always in a positive sequence state.
3. The intelligent monitoring and protection device for three-phase sequence as claimed in claim 1, wherein: four input ends of the over-under voltage module are respectively named as UA1, UB1, UC1 and N, three output ends are respectively named as UA2, UB2 and UC2, and the over-under voltage module is connected with an I/O input end of the CPU control module. In the working process, the CPU control module judges whether the three-phase power supply is in an overvoltage, undervoltage or normal working voltage range by detecting the voltage changes of three signal lines UA2, UB2 and UC2. The specific judgment is as follows: when a signal voltage in UA2, UB2 and UC2 is greater than a first preset value, determining that the signal voltage is an overvoltage; when a signal voltage in UA2, UB2 and UC2 is smaller than a second preset value, judging that the signal voltage is under-voltage; and when the CPU control module detects that one signal in UA2, UB2 and UC2 is overvoltage and/or undervoltage, the CPU control module controls the relay execution module to disconnect the connection between the three-phase power supply and the three-phase load. In addition, an overvoltage recovery value and an undervoltage recovery value are further arranged inside the CPU control module, and when the CPU control module detects that the overvoltage signal and/or the undervoltage signal are recovered to the recovery value range, the connection between the three-phase power supply and the three-phase load is automatically communicated after 3 seconds.
4. The intelligent monitoring and protection device for three-phase sequence as claimed in claim 1, wherein: three signal input ends of the overcurrent module are named as IA1, IB1, IC1 and N respectively, three signal output ends are named as IA2, IB2 and IC2 respectively and are connected with an I/O input end of the CPU control module. The CPU control module judges the current state of the three-phase power supply by detecting the current changes of three signal lines IA2, IB2 and IC2 in the working process, and when the CPU control module detects that the current state of one signal of IA2, IB2 and IC2 is larger than a preset value range, namely the current is judged to be over-current, the CPU control module controls the relay execution module to disconnect the three-phase power supply and the three-phase load. In addition, an overcurrent return value is further arranged inside the CPU control module, and when the CPU control module detects that the overcurrent returns to the preset value range, the connection between the three-phase power supply and the three-phase load is automatically communicated after 3 seconds.
5. The intelligent monitoring and protection device for three-phase sequence as claimed in claim 1, wherein: the overvoltage recovery value range, the undervoltage recovery value range, the current preset value range and the waiting time of 3 seconds are not fixed and can be set by a program according to actual work.
6. The intelligent monitoring and protection device for three-phase sequence as claimed in claim 1, wherein: the number of the signal input ends of the open-phase detection module is four, the signal input ends are respectively connected with the phase A, the phase B, the phase C and the neutral line N of the three-phase power supply, the number of the signal output ends is three, the three signal output ends are respectively named as PA0, PA1 and PA2, the three signal output ends are connected with the I/O input end of the CPU control module, and each signal line has 0 or 1 state. In the working process, the CPU control module may determine whether the three-phase power supply is open-phase according to changes in states of three signal lines PA0, PA1, and PA2, and if it is determined that the three-phase power supply is open-phase, control the relay execution module to disconnect the connection between the three-phase power supply and the three-phase load.
7. The relay execution module comprises four relays which are named as a first relay, a second relay, a third relay and a fourth relay respectively. When the phase sequence detection module detects that the phase sequence of the three-phase power supply is a positive sequence, the CPU control module controls a first relay of the relay execution module to be closed; when the phase sequence detection module detects that the phase sequence of the three-phase power supply is in a reverse sequence state A, C and B, the CPU control module controls a second relay of the relay execution module to pull in so as to automatically adjust the phase sequence; when the phase sequence detection module detects that the phase sequence of the three-phase power supply is in a reverse sequence state C, A and B, the CPU control module controls a third relay of the relay execution module to pull in so as to automatically adjust the phase sequence; and when the phase sequence detection module detects that the phase sequence of the three-phase power supply is in a reverse sequence state B, A and C, the CPU control module controls the fourth relay of the relay execution module to be closed so as to automatically adjust the phase sequence. It should be noted that the first relay, the second relay, the third relay and the fourth relay of the relay execution module are already interlocked internally through the auxiliary normally closed contact, so as to effectively avoid the inter-phase short circuit that may be caused.
8. The intelligent monitoring and protecting device for three-phase sequence as claimed in claim 1, characterized in that: the leakage detection module is composed of a separate electronic component, and when leakage is detected, the connection between the three-phase power supply and the three-phase load is disconnected. The liquid crystal display module is used for receiving and displaying the phase sequence state, the voltage state, the current state, the open-phase state and the electric leakage state of the three-phase power supply sent by the CPU control module. The CPU control module adopts a singlechip of an embedded chip STM 32.
9. The intelligent monitoring and protection device for three-phase sequence as claimed in claim 1, wherein: the sound and light alarm module is composed of separated electronic elements, and gives out sound and light alarm when detecting over-under-voltage, over-current, reverse sequence and open phase so as to prompt workers to further process. It should be noted that the sound and light alarm module is further provided with a manual cutting alarm button, so that a worker can conveniently cut off the alarm manually after knowing the alarm state, and noise pollution caused by the sound and light alarm module is avoided. The working indication module comprises a plurality of indicator lamps, each indicator lamp is respectively connected with the CPU control module, and the phase sequence detection module, the over-under voltage detection module, the over-current detection module, the phase failure detection module and the electric leakage detection module are respectively provided with at least one indicator lamp correspondingly.
10. A three-phase sequence intelligent monitoring protection device, characterized by comprising a three-phase power supply and the three-phase sequence intelligent monitoring protection device of any one of claims 1 to 9, wherein the three-phase sequence intelligent monitoring protection device is electrically connected with the three-phase power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211321620.6A CN115663775A (en) | 2022-10-26 | 2022-10-26 | Three-phase sequence intelligent monitoring protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211321620.6A CN115663775A (en) | 2022-10-26 | 2022-10-26 | Three-phase sequence intelligent monitoring protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115663775A true CN115663775A (en) | 2023-01-31 |
Family
ID=84990830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211321620.6A Pending CN115663775A (en) | 2022-10-26 | 2022-10-26 | Three-phase sequence intelligent monitoring protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115663775A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116699474A (en) * | 2023-08-03 | 2023-09-05 | 江苏纳通能源技术有限公司 | Three-phase ammeter phase sequence correction method and three-phase energy storage inverter |
-
2022
- 2022-10-26 CN CN202211321620.6A patent/CN115663775A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116699474A (en) * | 2023-08-03 | 2023-09-05 | 江苏纳通能源技术有限公司 | Three-phase ammeter phase sequence correction method and three-phase energy storage inverter |
| CN116699474B (en) * | 2023-08-03 | 2023-10-27 | 江苏纳通能源技术有限公司 | Three-phase ammeter phase sequence correction method and three-phase energy storage inverter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2022127160A1 (en) | Opening/closing operation apparatus for multiple types of circuit breaker, and fault detection method | |
| CN202395514U (en) | Dual-power switching device | |
| CN115663775A (en) | Three-phase sequence intelligent monitoring protection device | |
| CN104828658A (en) | Control system for construction elevator | |
| CN201360135Y (en) | Intelligent integrated leakage protection device | |
| CN1829035B (en) | Building electric fire hidden trouble alarm power distribution method and its circuit | |
| CN214622949U (en) | Testing arrangement suitable for direct current breaker with electronic control board | |
| CN106972462B (en) | Low-voltage distribution cabinet neutral line breakage protection device | |
| CN210016327U (en) | Monitoring device and monitoring system for automatic switch of distributed power distribution network | |
| CN210536284U (en) | Over-voltage and under-voltage protector for power supply | |
| WO2018107455A1 (en) | Apparatus and method for detecting switch contact state | |
| WO2018000192A1 (en) | Capacitor trip device having automatic power switching and method therefor | |
| CN107370120B (en) | Three-phase power supply protection device and electric power system | |
| CN201386894Y (en) | Startup circuit for emergency DC oil pump in lubricant station | |
| CN201498452U (en) | Plastic shell type circuit breaker | |
| CN2348517Y (en) | Protective device for AC contactor main contact fault | |
| CN2269020Y (en) | Electric power monitor | |
| CN111308145A (en) | Uninterrupted meter changing auxiliary power supply box with error correction protection function | |
| CN201717216U (en) | Residual current circuit breaker integrating reclosing device with casing | |
| CN219678118U (en) | Phase-change self-resetting overvoltage and undervoltage protection switch | |
| CN213072199U (en) | Dual-power automatic transfer switching device | |
| CN213423751U (en) | Safety controller based on circuit breaker electric operating mechanism | |
| CN219417667U (en) | Low-voltage circuit breaker calibration device | |
| CN215263944U (en) | Automatic switcher for power polarity detection | |
| CN203967724U (en) | A kind of power phase automatic correction device |
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 |