CN106771758B - Positioning device and method for faults in control loop of electrical switch cabinet - Google Patents
Positioning device and method for faults in control loop of electrical switch cabinet Download PDFInfo
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- CN106771758B CN106771758B CN201611255913.3A CN201611255913A CN106771758B CN 106771758 B CN106771758 B CN 106771758B CN 201611255913 A CN201611255913 A CN 201611255913A CN 106771758 B CN106771758 B CN 106771758B
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses a fault positioning device and a fault positioning method in a control loop of an electrical switch cabinet, wherein the fault positioning device comprises one or more positioning units; each positioning unit comprises a first buck rectifying module, an NOT gate, an AND gate, a trigger and a fault alarm unit; in each positioning unit, the input end of a first buck rectifying module is connected with one fault detection point of an electrical switch cabinet control loop, the output end of the first buck rectifying module is connected with the input end of a NOT gate, the output end of the NOT gate is connected with one input end of the AND gate, the other input end of the AND gate is connected with the response signal feedback end of the electrical equipment through a second buck rectifying module, the output end of the AND gate is connected with one input end of a trigger, the other input end of the trigger is connected with a reset circuit, the output end of the trigger is connected with a fault alarm unit, and the fault alarm unit is controlled to alarm through outputting high level or low level; the invention can rapidly and accurately locate the faults in the control loop of the electrical switch cabinet.
Description
Technical Field
The invention relates to the technical field of electrical engineering, in particular to a fault positioning device and method in a control loop of an electrical switch cabinet.
Background
An electrical switch cabinet is a common electrical device and is widely applied to the electrical field. The electrical switch cabinet is the equipment with the largest quantity, the most frequent operation and the highest failure rate in the transformer substation, and the failure of the control loop of the electrical switch cabinet accounts for more than 99% of the whole switch cabinet.
The start and stop of an electrical switch cabinet in a cement plant are controlled by a DCS (Distributed Control System ) in a field and central control two-place control mode. The control loop of the electrical switch cabinet adopts AC220V voltage, and the main contactor is driven to be closed or opened by electric elements such as a motor protector, a field switch, an interlocking switch, a fuse, a thermal relay and the like, so that the purpose of controlling the starting and stopping of equipment is achieved. The electrical components are arranged on the site, the switch cabinet and the DCS cabinet and the like, and are interlocked through cable connection, if one of the components or one cable fails, equipment is jumped and stopped, but faults are difficult to judge rapidly, so that the maintenance difficulty is high, and the working efficiency of a cement plant is greatly influenced.
For example, when a bucket lift of a cement grinding roller press of a cement plant suddenly stops without accident in the normal operation process, a cement grinding system is stopped, a central control DCS displays that the site is not ready, and the machine can be started after reset. At this time, the fault of the manual analysis may be a malfunction of a fuse, a thermal relay, an intermediate relay fault, a field switch, a speed measurement switch and the like in the switch cabinet, and may be caused by poor line contact. If a specific fault point is to be analyzed, the switch cabinet needs to be thoroughly checked manually, all line connection terminals are checked and fastened, and all elements which possibly cause faults are replaced. By the fault judging mode, a large amount of manpower and material resources are spent, and the working efficiency of cement is greatly reduced. In addition, in the case of poor contact or unstable contact of some electrical elements or circuits, signals can fluctuate, and maintenance personnel can hardly accurately and rapidly judge fault points by adopting a universal meter and an electroscope; and maintenance personnel hold the universal meter and test pencil apart from the electrified position of 220V only about 20 centimetres, have great potential safety hazard.
Disclosure of Invention
The first object of the present invention is to overcome the drawbacks and disadvantages of the prior art, and to provide a positioning device for a fault in a control circuit of an electrical switchgear, which can quickly and accurately position the fault in the control circuit of the electrical switchgear, and reduce the maintenance difficulty of the control circuit of the electrical switchgear.
The second object of the invention is to provide a fault positioning method in the control loop of the electrical switch cabinet based on the positioning device.
The third object of the invention is to provide a positioning device for faults in the control circuit of the electrical switch cabinet, which can also quickly and accurately position the faults in the control circuit of the electrical switch cabinet, thereby reducing the maintenance difficulty of the control circuit of the electrical switch cabinet.
A fourth object of the present invention is to improve a method for locating faults in a control loop of an electrical switchgear, which is implemented by a locating device according to the third object.
The first object of the invention is achieved by the following technical scheme: a fault positioning device in a control loop of an electrical switch cabinet consists of one or more positioning units;
each positioning unit comprises a first buck rectifying module, an NOT gate, an AND gate, a trigger and a fault alarm unit;
In each positioning unit, the input end of a first buck rectifier module is connected with one fault detection point of an electrical switch cabinet control loop, the output end of the first buck rectifier module is connected with the input end of an NOT gate, the output end of the NOT gate is connected with one of the input ends of the AND gate, the other input end of the AND gate is connected with the output end of a second buck rectifier module, the input end of the second buck rectifier module is connected with an electrical equipment response signal feedback end, the output end of the AND gate is connected with one input end of a trigger, the zero setting input end of the trigger is connected with a reset circuit, and the reset circuit resets the trigger; the output end of the trigger is connected with the fault alarm unit, and the fault alarm unit is controlled to alarm through the output high level.
Preferably, the fault alarm unit comprises a contactor and a light emitting diode, two wiring terminals of a group of coils of the contactor are respectively correspondingly connected with the output end of the trigger and the ground, and the working state of the contactor is controlled through the output of the trigger; the direct current power supply is connected with a pair of contacts of the contactor in series and the rear of the light-emitting diode is grounded; the on-off of the light emitting diode is controlled by the working state of the contactor.
Preferably, the reset circuit comprises a reset switch, an electrolytic capacitor and a resistor, wherein the zero setting input end of the trigger is grounded through the resistor, the zero setting input end of the trigger is connected with a direct current power supply through the reset switch and the electrolytic capacitor which are connected in parallel, and the reset switch resets the trigger to zero;
The trigger is an RS trigger or a JK trigger;
in each positioning unit, a first photoelectric coupler is connected between the first buck rectifying module and the NOT gate input end, and a second photoelectric coupler is connected between the second buck rectifying module and the AND gate input end;
when the number of the positioning units is multiple, the second buck rectification modules connected with the input ends of the AND gates of the positioning units are identical, and the reset circuits connected with the triggers of the positioning units are identical.
The second object of the invention is achieved by the following technical scheme: the method for realizing the positioning of the fault in the control loop of the electrical switch cabinet based on the positioning device of the fault in the control loop of the electrical switch cabinet in the first object is characterized by comprising the following steps:
s1, resetting a trigger in a positioning unit, so that a low level is output after the trigger is reset; then, connecting the input end of a first buck rectifying module of the positioning unit to a fault detection point of an electrical switch cabinet control loop, and connecting the input end of a second buck rectifying module of the positioning unit to an electrical equipment response signal feedback end;
s2, after the electric equipment is started, the signal output by the response signal feedback end of the electric equipment is subjected to voltage reduction and rectification by the second voltage reduction rectification module, and then high level is output to the input end of the AND gate, and the positioning unit is started to start working;
S3, when a fault detection point of an electrical switch cabinet control loop connected with the input end of the first buck rectifying module in the positioning unit does not have a fault, the voltage input by the input end of the first buck rectifying module is input to the NOT gate after buck rectification, the NOT gate receives high-level signals output by the output ends of the first buck rectifying module and the second buck rectifying module and then outputs low level to the AND gate, at the moment, the output end of the AND gate outputs low level to the trigger to be placed at an input end, the output state of the trigger is kept unchanged, so that the low level is output to the fault alarm unit, and the fault alarm unit does not work;
s4, when a fault detection point of an electrical switch cabinet control loop connected with the input end of the first buck rectifying module in the positioning unit fails, the input end of the first buck rectifying module is not provided with voltage signal input, at the moment, a NOT gate connected with the output end of the first buck rectifying module outputs a high-level signal to an AND gate, at the moment, the output end of the AND gate outputs a high level to a trigger setting input end, and the trigger output is setting one, so that the high level is output to a fault alarm unit, the fault alarm unit is controlled to alarm, and the fault detection point of the electrical switch cabinet control loop connected with the input end of the first buck rectifying module of the positioning unit is prompted to fail.
Preferably, the fault alarm unit comprises a contactor and a light emitting diode, two wiring terminals of a group of coils of the contactor are respectively correspondingly connected with the output end of the trigger and the ground, and the direct current power supply is connected with a pair of contacts of the contactor and the light emitting diode in series and then grounded;
in the step S3, when the output end of the trigger outputs a low level, a group of coils of the contactor connected with the trigger are not electrified, the contactor is not operated at this time, a pair of contacts connected with the light emitting diode in the contactor are in an on state, and the light emitting diode is not on;
in the step S4, when the output end of the trigger outputs a high level, a group of coils of the contactor connected with the trigger are electrified, the contactor works at the moment, a pair of contacts connected with the light emitting diode in the contactor are in a closed state, and the light emitting diode is lightened; and prompting a fault detection point of an electrical switch cabinet control loop connected with the input end of the first step-down rectifying module of the positioning unit to generate a fault.
The third object of the invention is achieved by the following technical scheme: a fault positioning device in a control loop of an electrical switch cabinet consists of one or more positioning units;
each positioning unit comprises a first buck rectifying module, an NOT gate, an AND gate, a trigger and a fault alarm unit;
In each positioning unit, the input end of the first buck rectifying module is connected with one fault detection point of the control loop of the electrical switch cabinet, the output end of the first buck rectifying module is connected with the input end of the NOT gate, and the output end of the NOT gate is connected with one of the input ends of the AND gate; the other input end of the AND gate is connected with the output end of the second buck rectifying module, the input end of the second buck rectifying module is connected with the feedback end of the response signal of the electrical equipment, the output end of the AND gate is connected with the zero setting input end of the trigger, the one setting input end of the trigger is connected with the reset circuit, and the reset circuit resets the trigger; the output end of the trigger is connected with the fault alarm unit, and the fault alarm unit is controlled to alarm through the output low level.
Preferably, the fault alarm unit comprises a contactor and a light emitting diode, two wiring terminals of a group of coils of the contactor are respectively correspondingly connected with the output end of the trigger and the power supply, and the working state of the contactor is controlled through the output of the trigger; the direct current power supply is connected with a pair of contacts of the contactor and the light-emitting diode in series and then grounded, and the on-off of the light-emitting diode is controlled through the working state of the contactor.
Preferably, the reset circuit comprises a reset switch, an electrolytic capacitor and a resistor, wherein one input end of the trigger is grounded through the resistor, the other input end of the trigger is connected with a direct current power supply through the reset switch and the electrolytic capacitor which are connected in parallel, and the reset switch resets the trigger;
The trigger is an RS trigger or a JK trigger; in each positioning unit, a first photoelectric coupler is connected between the first buck rectifying module and the NOT gate input end, and a second photoelectric coupler is connected between the second buck rectifying module and the AND gate input end;
when the number of the positioning units is multiple, the second buck rectification modules connected with the input ends of the AND gates of the positioning units are identical, and the reset circuits connected with the triggers of the positioning units are identical.
The fourth object of the invention is achieved by the following technical scheme: the method for realizing the positioning of the fault in the control loop of the electrical switch cabinet based on the positioning device of the fault in the control loop of the electrical switch cabinet in the second object is characterized by comprising the following steps:
s1, resetting a trigger in a positioning unit, enabling the trigger to output a high level after being reset, connecting the input end of a first buck rectifying module of the positioning unit to a fault detection point of a control loop of an electrical switch cabinet, and connecting the input end of a second buck rectifying module of the positioning unit to a response signal feedback end of electrical equipment;
s2, after the electric equipment is started, the signal output by the response signal feedback end of the electric equipment is subjected to voltage reduction and rectification by the second voltage reduction rectification module, and then high level is output to the input end of the AND gate, and the positioning unit is started to start working;
S3, when a fault detection point of an electrical switch cabinet control loop connected with the input end of the first buck rectifying module in the positioning unit does not have a fault, the voltage input by the input end of the first buck rectifying module is input to the NOT gate after buck rectification, the NOT gate receives high-level signals output by the output ends of the first buck rectifying module and the second buck rectifying module and then outputs low level to the AND gate, and the output end of the AND gate outputs low level to the zero setting input end of the trigger; at the moment, the output state of the trigger is kept unchanged, so that a high level is output to the fault alarm unit, and the fault alarm unit does not work;
s4, when a fault detection point of an electrical switch cabinet control loop connected with the input end of the first buck rectifying module in the positioning unit fails, no voltage signal is input to the input end of the first buck rectifying module, at the moment, a NOT gate connected with the output end of the first buck rectifying module outputs a high-level signal to an AND gate, and the output end of the AND gate outputs a high level to a trigger zero setting end; at the moment, the trigger outputs zero, outputs low level to the fault alarm unit, controls the fault alarm unit to alarm, and prompts the fault detection point of the control loop of the electrical switch cabinet connected with the input end of the first step-down rectifying module of the positioning unit to generate faults.
Preferably, the fault alarm unit comprises a contactor and a light emitting diode, two wiring terminals of a group of coils of the contactor are respectively correspondingly connected with the output end of the trigger and the power supply, and the direct current power supply is connected with a pair of contacts of the contactor and the light emitting diode in series and then grounded;
in the step S3, when the output end of the trigger outputs a high level, a group of coils of the contactor connected with the trigger are not electrified, the contactor is not operated at this time, a pair of contacts connected with the light emitting diode in the contactor are in an on state, and the light emitting diode is not lightened;
in the step S4, when the output end of the trigger outputs a low level, a group of coils of the contactor connected with the trigger are energized, the contactor works at this time, a pair of contacts connected with the light emitting diode in the contactor are in a closed state, and the light emitting diode is lightened; and prompting a fault detection point of an electrical switch cabinet control loop connected with the input end of the first step-down rectifying module of the positioning unit to generate a fault.
Compared with the prior art, the invention has the following advantages and effects:
(1) The positioning unit of the positioning device comprises a first buck rectification module, an NOT gate, an AND gate, a trigger and a fault alarm unit; the input end of the first buck rectifying module is connected with one fault detection point of the control loop of the electrical switch cabinet, the output end of the first buck rectifying module is connected with the input end of the NOT gate, and the output end of the NOT gate is connected with one of the input ends of the AND gate; the other input end of the AND gate is connected with the response signal feedback end of the electrical equipment through the second buck rectifying module, the output end of the AND gate is connected with one input end of the trigger, the other input end of the trigger is connected with the reset circuit, the trigger is reset through the reset circuit, the output end of the trigger is connected with the fault alarm unit, and the fault alarm unit is controlled to alarm through outputting high level or low level. When the fault detection point of the electric switch cabinet control circuit connected with the first step-down rectifying module of the positioning unit fails, the fault alarm unit of the positioning unit carries out alarm work, so that the invention can confirm whether the fault detection point of the electric switch cabinet control circuit connected with the first step-down rectifying module of the positioning unit fails according to whether the fault alarm unit of the positioning unit carries out alarm work or not, and has the advantage of quick and accurate fault confirmation. In addition, the positioning device can comprise a plurality of positioning units, wherein the first voltage reduction rectifying modules of the positioning units are respectively connected to the places where the control loop of the electrical switch cabinet needs to perform fault detection, and when faults occur, the fault alarm units corresponding to the connected positioning units can perform alarm work. The technical problems of low fault detection efficiency, high difficulty and potential safety hazard of the control loop of the electrical switch cabinet in the prior art are solved.
(2) The fault alarm unit in the positioning unit of the positioning device is composed of the contactor and the light-emitting diode, the trigger of the positioning unit drives the light-emitting diode to work by controlling the working state of the contactor, and an operator can intuitively judge whether the fault occurs according to the on-off state of the light-emitting diode.
(3) In the positioning device, when a plurality of positioning units are arranged, the second buck rectifying modules connected with the gate input ends of the positioning units are identical, and the reset circuits connected with the triggers of the positioning units are identical, so that the structure of the positioning device is greatly simplified, and the positioning units of the positioning device can be started and reset simultaneously through the structure, and the operation process is simplified.
Drawings
Fig. 1 is a block diagram of each positioning unit in the positioning device of embodiment 1 of the present invention.
Fig. 2 is a block diagram of a positioning device according to embodiment 1 of the present invention.
Fig. 3 is a schematic diagram of each failure alarm unit corresponding to each positioning unit in the positioning device of embodiment 1 and embodiment 2 in the present invention.
Fig. 4 is a schematic diagram of the control circuit of the electrical switch cabinet of the ordinary motor WE 07.
Fig. 5 is a block diagram of each positioning unit in the positioning device of embodiment 2 of the present invention.
Fig. 6 is a block diagram of a positioning device according to embodiment 2 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Example 1
The embodiment discloses a fault positioning device in a control loop of an electrical switch cabinet, which consists of one or more positioning units;
as shown in fig. 1, each positioning unit comprises a first buck rectification module, an NOT gate, an AND gate, a trigger and a fault alarm unit; in each positioning unit, the input end of the first buck rectifying module is connected with one fault detection point of the control loop of the electrical switch cabinet, the output end of the first buck rectifying module is connected with the input end of the NOT gate, and the output end of the NOT gate is connected with one of the input ends of the AND gate; the other input end of the AND gate is connected with the output end of the second buck rectifying module, the input end of the second buck rectifying module is connected with the response signal feedback end of the electrical equipment, the output end of the AND gate is connected with the setting input end of the trigger, the setting input end of the trigger is respectively connected with a power supply and the ground through a reset circuit, the output end of the trigger is connected with a fault alarm unit, and the fault alarm unit is controlled to alarm through the output high level.
The fault alarm unit in the embodiment comprises a contactor and a light emitting diode, wherein two wiring terminals of a group of coils of the contactor are respectively and correspondingly connected with the output end of the trigger and the ground, and the working state of the contactor is controlled through the output of the trigger; the direct current power supply is connected with a pair of contacts of the contactor and the light-emitting diode in series and then grounded, and the on-off of the light-emitting diode is controlled through the working state of the contactor.
The reset circuit in the embodiment comprises a reset switch, an electrolytic capacitor and a resistor, wherein the zero input end of the trigger is grounded through the resistor, the zero input end of the trigger is connected with a direct current power supply through the reset switch and the electrolytic capacitor which are connected in parallel, and the reset switch resets the trigger. Before each positioning unit starts positioning operation, the positioning unit is reset firstly, at this time, because the positioning unit is not in a working state, the output of the NOT gate circuit is a low level signal, so that the input end of the trigger is input into a low level, when the reset switch is pressed down in the resetting process, the zero input end of the trigger is input into a high level, at this time, the output end of the trigger is set to zero, the resetting is completed, and when the reset switch is released, the zero input end of the trigger is input into a low level, at this time, the trigger is in a holding state, and the input level of the output end is unchanged and still is a low level.
As shown in fig. 1, the flip-flop in this embodiment is an RS flip-flop, the S end of the RS flip-flop is a set end, and the R end is a zero end, and of course, the flip-flop in this embodiment may be other types of flip-flops, such as a JK flip-flop.
In each positioning unit of the embodiment, a first photoelectric coupler is connected between a first buck rectifying module and an NOT gate input end, and a second photoelectric coupler is connected between a second buck rectifying module and an AND gate input end. The first photoelectric coupler and the second photoelectric coupler are used for realizing isolation of input and output, and interference of high voltage in a control loop of the electric switch cabinet to the positioning unit in the embodiment is reduced.
The embodiment also discloses a method for realizing the positioning of the faults in the control loop of the electrical switch cabinet based on the positioning device of the faults in the control loop of the electrical switch cabinet, which comprises the following steps:
s1, resetting a trigger in a positioning unit, so that a low level is output after the trigger is reset; then, connecting the input end of a first buck rectifying module of the positioning unit to a fault detection point of an electrical switch cabinet control loop, and connecting the input end of a second buck rectifying module of the positioning unit to an electrical equipment response signal feedback end;
S2, after the electric equipment is started, the signal output by the response signal feedback end of the electric equipment is subjected to voltage reduction and rectification by the second voltage reduction rectification module, and then high level is output to the input end of the AND gate, and the positioning unit is started to start working;
s3, when a fault detection point of an electrical switch cabinet control loop connected with the input end of the first buck rectifying module in the positioning unit does not have a fault, the voltage input by the input end of the first buck rectifying module is input to the NOT gate after buck rectification, the NOT gate receives high-level signals output by the output ends of the first buck rectifying module and the second buck rectifying module and then outputs low level to the AND gate, at the moment, the output end of the AND gate outputs low level to the trigger to be placed at an input end, the output state of the trigger is kept unchanged, so that the low level is output to the fault alarm unit, and the fault alarm unit does not work;
s4, when a fault detection point of an electrical switch cabinet control loop connected with the input end of the first buck rectifying module in the positioning unit fails, the input end of the first buck rectifying module is not provided with voltage signal input, at the moment, a NOT gate connected with the output end of the first buck rectifying module outputs a high-level signal to an AND gate, at the moment, the output end of the AND gate outputs a high level to a trigger setting input end, and the trigger output is setting one, so that the high level is output to a fault alarm unit, the fault alarm unit is controlled to alarm, and the fault detection point of the electrical switch cabinet control loop connected with the input end of the first buck rectifying module of the positioning unit is prompted to fail.
In the step S3, when the output end of the trigger outputs a low level, a group of coils of the contactor connected with the trigger are not energized, the contactor is not operated at this time, a pair of contacts connected with the light emitting diode in the contactor are in an on state, and the light emitting diode is not on;
in the step S4, when the output end of the trigger outputs a high level, a group of coils of the contactor connected with the trigger are energized, the contactor works at this time, a pair of contacts connected with the light emitting diode in the contactor are in a closed state, and the light emitting diode is lightened; and prompting a fault detection point of an electrical switch cabinet control loop connected with the input end of the first step-down rectifying module of the positioning unit to generate a fault.
In this embodiment, when the number of the positioning units is plural, the second buck rectification modules connected to the gate input end of each positioning unit are the same, and the reset circuits connected to the flip-flops of each positioning unit are the same.
As shown in fig. 2, the positioning device in this embodiment includes 4 positioning units, which are a first positioning unit, a second positioning unit, a third positioning unit, and a fourth positioning unit, and simultaneous detection of 4 fault points in the electrical switch cabinet control loop can be completed through the 4 positioning units. In this embodiment, the second buck rectification modules connected to the gate input ends of the 4 positioning units are identical, and the reset circuits connected to the flip-flops of the 4 positioning units are identical. As shown in fig. 3, in the contactors Q1, Q2, Q3 and Q4 of the fault alarm unit of the present embodiment 4 positioning units, one of the two contacts of one pair of contacts is connected to a dc power supply, and the other contact is grounded through a light emitting diode. When the coils of the contactors Q1, Q2, Q3 and Q4 are energized, a pair of contacts thereon are closed and the corresponding connected leds are illuminated.
As shown in fig. 4, which is a schematic diagram of an electrical switch cabinet control circuit of a common motor WE07, the and gate input ends of the 4 positioning units in this embodiment are connected to the output end of the same second buck rectifying module, and the input end of the second buck rectifying module is connected to the feedback end of the response signal of the motor WE 07. The input end of the first step-down rectifying module of the first positioning unit is connected to a wire behind a fuse wire of a control loop of the motor WE 07; the input end of the first step-down rectifying module of the second positioning unit is connected with a thermal relay circuit of a control loop of the motor WE 07; the input end of the first step-down rectifying module of the third positioning unit is connected with a field switch circuit of a control loop of the motor WE 07; the input end of the first step-down rectifying module of the fourth positioning unit is connected with a DCS ready signal circuit of a control loop of the motor WE 07.
The positioning unit of the embodiment resets the trigger in the positioning unit before fault detection, and after the resetting is completed, when the motor WE07 is started, the positioning unit starts fault detection. If the fuse is in fault, the input end of the first step-down rectifying module of the first positioning unit inputs low level to the NOT gate, and at the moment, the trigger of the first positioning unit outputs high level to control the fault alarm unit of the first positioning unit to work, namely the fault alarm unit LED1 of the first positioning unit is lightened.
If the thermal relay is in fault, the input end of the first step-down rectifying module of the second positioning unit inputs low level to the NOT gate, and at the moment, the trigger of the second positioning unit outputs high level to control the fault alarming unit of the second positioning unit to work, namely the fault alarming unit LED2 of the second positioning unit is lightened.
If the on-site switch malfunctions or fails to cause a shutdown, the input end of the first buck rectifying module of the third positioning unit inputs a low level to the NOT gate, and at the moment, the trigger of the third positioning unit outputs a high level to control the failure alarm unit of the third positioning unit to work, namely the LED3 of the failure alarm unit of the third positioning unit lightens.
If the DCS is ready for signal loss to cause shutdown, the input end of the first buck rectifying module of the fourth positioning unit inputs low level to the NOT gate, and at the moment, the trigger of the fourth positioning unit outputs high level to control the fault alarm unit of the fourth positioning unit to work, namely the fault alarm unit LED3 of the fourth positioning unit lightens.
Therefore, through the positioning device of the embodiment, an operator can position the fault point in the control loop of the electrical switch cabinet according to the positioning unit where the lightened light-emitting diode is located. The detection and elimination of each point are not needed, and the fault detection efficiency is greatly improved. The positioning device can rapidly and accurately position the faults in the control loop of the electrical switch cabinet, and the maintenance difficulty of the control loop of the electrical switch cabinet is reduced.
Example 2
The embodiment discloses a fault positioning device in a control loop of an electrical switch cabinet, which consists of one or more positioning units;
as shown in fig. 5, each positioning unit in this embodiment includes a first buck rectification module, an inverter, an and gate, a trigger, and a fault alarm unit.
In each positioning unit, the input end of the first buck rectifying module is connected with one fault detection point of the control loop of the electrical switch cabinet, the output end of the first buck rectifying module is connected with the input end of the NOT gate, and the output end of the NOT gate is connected with one of the input ends of the AND gate; the other input end of the AND gate is connected with the output end of the second buck rectifying module, the input end of the second buck rectifying module is connected with the feedback end of the response signal of the electrical equipment, the output end of the AND gate is connected with the zero setting input end of the trigger, and the one setting input end of the trigger is respectively connected with a power supply and the ground through a reset circuit; the output end of the trigger is connected with the fault alarm unit, and the fault alarm unit is controlled to alarm through the output low level.
The fault alarm unit in the embodiment comprises a contactor and a light-emitting diode, wherein two wiring terminals of a group of coils of the contactor are respectively and correspondingly connected with the output end of the trigger and a power supply, and the working state of the contactor is controlled through the output of the trigger; the direct current power supply is connected with a pair of contacts of the contactor and the light-emitting diode in series and then grounded, and the on-off of the light-emitting diode is controlled through the working state of the contactor.
The reset circuit in the embodiment comprises a reset switch, an electrolytic capacitor and a resistor, wherein an input end of the trigger is grounded through the resistor, the input end of the trigger is connected with a direct current power supply through the reset switch and the electrolytic capacitor which are connected in parallel, and the trigger is reset through the reset switch. Before each positioning unit starts positioning operation, the positioning unit is reset firstly, at this time, because the positioning unit is not in a working state, the output of the NOT gate circuit is a low level signal, so that the zero input end of the trigger is input to be low level, when the reset switch is pressed down in the resetting process, the input end of the trigger is input to be high level, at this time, the output end of the trigger is put one, the resetting is completed, and when the reset switch is released, the input end of the trigger is input to be low level, at this time, the trigger is in a holding state, and the input level of the output end is unchanged and still is high level.
As shown in fig. 5, in this embodiment, the flip-flop is an RS flip-flop; the S end of the RS flip-flop is a set end, and the R end is a zero end, which may be other types of flip-flops, such as JK flip-flops, in this embodiment.
In each positioning unit, a first photoelectric coupler is connected between a first buck rectifying module and an NOT gate input end, and a second photoelectric coupler is connected between a second buck rectifying module and an AND gate input end;
The embodiment also discloses a method for realizing the positioning of faults in the control loop of the electrical switch cabinet based on the positioning device, which comprises the following steps:
s1, resetting a trigger in a positioning unit, enabling the trigger to output a high level after being reset, wherein the input end of a first buck rectifying module of the positioning unit is connected with a fault detection point of an electric switch cabinet control loop, and the input end of a second buck rectifying module of the positioning unit is connected with an electric equipment response signal feedback end;
s2, after the electric equipment is started, the signal output by the response signal feedback end of the electric equipment is subjected to voltage reduction and rectification by the second voltage reduction rectification module, and then high level is output to the input end of the AND gate, and the positioning unit is started to start working;
s3, when a fault detection point of an electrical switch cabinet control loop connected with the input end of the first buck rectifying module in the positioning unit does not have a fault, the voltage input by the input end of the first buck rectifying module is input to the NOT gate after buck rectification, the NOT gate receives high-level signals output by the output ends of the first buck rectifying module and the second buck rectifying module and then outputs low level to the AND gate, and the output end of the AND gate outputs low level to the zero setting input end of the trigger; at the moment, the output state of the trigger is kept unchanged, so that a high level is output to the fault alarm unit, and the fault alarm unit does not work;
S4, when a fault detection point of an electrical switch cabinet control loop connected with the input end of the first buck rectifying module in the positioning unit fails, no voltage signal is input to the input end of the first buck rectifying module, at the moment, a NOT gate connected with the output end of the first buck rectifying module outputs a high-level signal to an AND gate, and the output end of the AND gate outputs a high level to a trigger zero setting end; at the moment, the trigger outputs zero, outputs low level to the fault alarm unit, controls the fault alarm unit to alarm, and prompts the fault detection point of the control loop of the electrical switch cabinet connected with the input end of the first step-down rectifying module of the positioning unit to generate faults.
In the step S3, when the output end of the trigger outputs a high level, a group of coils of the contactor connected with the trigger in the fault alarm unit are not electrified, the contactor is not operated at this time, a pair of contacts connected with the light emitting diode in the contactor are in an on state, and the light emitting diode is not on;
in the step S4, when the output end of the trigger outputs a low level, a group of coils of the contactor connected with the trigger in the fault alarm unit are electrified, the contactor works at this time, a pair of contacts connected with the light emitting diode in the contactor are in a closed state, and the light emitting diode is lightened; and prompting a fault detection point of an electrical switch cabinet control loop connected with the input end of the first step-down rectifying module of the positioning unit to generate a fault.
In this embodiment, when the number of the positioning units is plural, the second buck rectification modules connected to the gate input ends of the positioning units are the same, and the reset circuits connected to the flip-flops of the positioning units are the same.
As shown in fig. 6, the positioning device in this embodiment includes 4 positioning units, which are a first positioning unit, a second positioning unit, a third positioning unit, and a fourth positioning unit, and simultaneous detection of 4 fault points in the electrical switch cabinet control loop can be completed through the 4 positioning units. As shown in fig. 3, in the fault alarm unit of the present embodiment 4, one of the two contacts of the pair of contacts Q1, Q2, Q3 and Q4 is connected to a dc power supply, and the other is grounded through a light emitting diode. When the coils of the contactors Q1, Q2, Q3 and Q4 are energized, a pair of contacts thereon are closed and the corresponding connected leds are illuminated.
As shown in fig. 4, which is a schematic diagram of an electrical switch cabinet control circuit of a common motor WE07, the and gate input ends of the 4 positioning units in this embodiment are connected to the output end of the same second buck rectifying module, and the input end of the second buck rectifying module is connected to the feedback end of the response signal of the motor WE 07. The input end of the first step-down rectifying module of the first positioning unit is connected to a wire behind a fuse wire of a control loop of the motor WE 07; the input end of the first step-down rectifying module of the second positioning unit is connected with a thermal relay circuit of a control loop of the motor WE 07; the input end of the first step-down rectifying module of the third positioning unit is connected with a field switch circuit of a control loop of the motor WE 07; the input end of the first step-down rectifying module of the fourth positioning unit is connected with a DCS ready signal circuit of a control loop of the motor WE 07.
The positioning unit of the embodiment resets the trigger in the positioning unit before fault detection, and after the resetting is completed, when the motor WE07 is started, the positioning unit starts fault detection.
If the fuse is in fault, the input end of the first step-down rectifying module of the first positioning unit inputs low level to the NOT gate, and at the moment, the trigger of the first positioning unit outputs low level to control the fault alarm unit of the first positioning unit to work, namely the fault alarm unit LED1 of the first positioning unit is lightened.
If the thermal relay is in fault, the input end of the first step-down rectifying module of the second positioning unit inputs low level to the NOT gate, and at the moment, the trigger of the second positioning unit outputs low level to control the fault alarming unit of the second positioning unit to work, namely the fault alarming unit LED2 of the second positioning unit is lightened.
If the on-site switch malfunctions or fails to cause a shutdown, the input end of the first buck rectifying module of the third positioning unit inputs a low level to the NOT gate, and at the moment, the trigger of the third positioning unit outputs the low level to control the failure alarm unit of the third positioning unit to work, namely the LED3 of the failure alarm unit of the third positioning unit lightens.
If the DCS is ready for signal loss to cause shutdown, the input end of the first buck rectifying module of the fourth positioning unit inputs a low level to the NOT gate, and at the moment, the trigger of the fourth positioning unit outputs the low level to control the fault alarm unit of the fourth positioning unit to work, namely the fault alarm unit LED3 of the fourth positioning unit lightens.
Therefore, through the positioning device of the embodiment, an operator can also position the fault point in the control loop of the electrical switch cabinet according to the positioning unit where the lightened light-emitting diode is positioned. The detection and elimination of each point are not needed, and the fault detection efficiency is greatly improved. The positioning device can rapidly and accurately position the faults in the control loop of the electrical switch cabinet, and the maintenance difficulty of the control loop of the electrical switch cabinet is reduced.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (8)
1. The fault locating method for the control loop of the electrical switch cabinet is characterized in that the locating device consists of one or more locating units;
Each positioning unit comprises a first buck rectifying module, an NOT gate, an AND gate, a trigger and a fault alarm unit;
in each positioning unit, the input end of a first buck rectifier module is connected with one fault detection point of an electrical switch cabinet control loop, the output end of the first buck rectifier module is connected with the input end of an NOT gate, the output end of the NOT gate is connected with one of the input ends of the AND gate, the other input end of the AND gate is connected with the output end of a second buck rectifier module, the input end of the second buck rectifier module is connected with an electrical equipment response signal feedback end, the output end of the AND gate is connected with one input end of a trigger, the zero setting input end of the trigger is connected with a reset circuit, and the reset circuit resets the trigger; the output end of the trigger is connected with the fault alarm unit, and the fault alarm unit is controlled to alarm through the output high level;
the positioning method for the fault in the control loop of the electrical switch cabinet by the positioning device comprises the following steps:
s1, resetting a trigger in a positioning unit, so that a low level is output after the trigger is reset; then, connecting the input end of a first buck rectifying module of the positioning unit to a fault detection point of an electrical switch cabinet control loop, and connecting the input end of a second buck rectifying module of the positioning unit to an electrical equipment response signal feedback end;
S2, after the electric equipment is started, the signal output by the response signal feedback end of the electric equipment is subjected to voltage reduction and rectification by the second voltage reduction rectification module, and then high level is output to the input end of the AND gate, and the positioning unit is started to start working;
s3, when a fault detection point of an electrical switch cabinet control loop connected with the input end of the first buck rectifying module in the positioning unit does not have a fault, the voltage input by the input end of the first buck rectifying module is input to the NOT gate after buck rectification, the NOT gate receives high-level signals output by the output ends of the first buck rectifying module and the second buck rectifying module and then outputs low level to the AND gate, at the moment, the output end of the AND gate outputs low level to the trigger to be placed at an input end, the output state of the trigger is kept unchanged, so that the low level is output to the fault alarm unit, and the fault alarm unit does not work;
s4, when a fault detection point of an electrical switch cabinet control loop connected with the input end of the first buck rectifying module in the positioning unit fails, the input end of the first buck rectifying module is not provided with voltage signal input, at the moment, a NOT gate connected with the output end of the first buck rectifying module outputs a high-level signal to an AND gate, at the moment, the output end of the AND gate outputs a high level to a trigger setting input end, and the trigger output is setting one, so that the high level is output to a fault alarm unit, the fault alarm unit is controlled to alarm, and the fault detection point of the electrical switch cabinet control loop connected with the input end of the first buck rectifying module of the positioning unit is prompted to fail.
2. The method for locating faults in a control loop of an electrical switchgear according to claim 1, wherein the fault alarm unit comprises a contactor and a light emitting diode, two terminals of a set of coils of the contactor are respectively and correspondingly connected with an output end of a trigger and ground, and the working state of the contactor is controlled through the output of the trigger;
the direct current power supply is connected with a pair of contacts of the contactor in series and the rear of the light-emitting diode is grounded; the on-off of the light emitting diode is controlled by the working state of the contactor.
3. The method for locating faults in a control loop of an electrical switch cabinet according to claim 1, wherein the reset circuit comprises a reset switch, an electrolytic capacitor and a resistor, wherein a zero setting input end of the trigger is grounded through the resistor, the zero setting input end of the trigger is connected with a direct current power supply through the reset switch and the electrolytic capacitor which are connected in parallel, and the reset switch resets the trigger;
the trigger is an RS trigger or a JK trigger;
in each positioning unit, a first photoelectric coupler is connected between the first buck rectifying module and the NOT gate input end, and a second photoelectric coupler is connected between the second buck rectifying module and the AND gate input end;
When the number of the positioning units is multiple, the second buck rectification modules connected with the input ends of the AND gates of the positioning units are identical, and the reset circuits connected with the triggers of the positioning units are identical.
4. The method for locating a fault in a control loop of an electrical switchgear according to claim 1, wherein the fault alarm unit comprises a contactor and a light emitting diode, two terminals of a set of coils of the contactor are respectively and correspondingly connected with an output end of a trigger and the ground, and a direct current power supply is connected with a pair of contacts of the contactor and the light emitting diode in series and then grounded;
in the step S3, when the output end of the trigger outputs a low level, a group of coils of the contactor connected with the trigger are not electrified, the contactor is not operated at this time, a pair of contacts connected with the light emitting diode in the contactor are in an on state, and the light emitting diode is not on;
in the step S4, when the output end of the trigger outputs a high level, a group of coils of the contactor connected with the trigger are electrified, the contactor works at the moment, a pair of contacts connected with the light emitting diode in the contactor are in a closed state, and the light emitting diode is lightened; and prompting a fault detection point of an electrical switch cabinet control loop connected with the input end of the first step-down rectifying module of the positioning unit to generate a fault.
5. The fault locating method for the control loop of the electrical switch cabinet is characterized in that the locating device consists of one or more locating units;
each positioning unit comprises a first buck rectifying module, an NOT gate, an AND gate, a trigger and a fault alarm unit;
in each positioning unit, the input end of the first buck rectifying module is connected with one fault detection point of the control loop of the electrical switch cabinet, the output end of the first buck rectifying module is connected with the input end of the NOT gate, and the output end of the NOT gate is connected with one of the input ends of the AND gate; the other input end of the AND gate is connected with the output end of the second buck rectifying module, the input end of the second buck rectifying module is connected with the feedback end of the response signal of the electrical equipment, the output end of the AND gate is connected with the zero setting input end of the trigger, the one setting input end of the trigger is connected with the reset circuit, and the reset circuit resets the trigger; the output end of the trigger is connected with the fault alarm unit, and the fault alarm unit is controlled to alarm through the output low level;
the positioning method for the fault in the control loop of the electrical switch cabinet by the positioning device comprises the following steps:
s1, resetting a trigger in a positioning unit, enabling the trigger to output a high level after being reset, connecting the input end of a first buck rectifying module of the positioning unit to a fault detection point of a control loop of an electrical switch cabinet, and connecting the input end of a second buck rectifying module of the positioning unit to a response signal feedback end of electrical equipment;
S2, after the electric equipment is started, the signal output by the response signal feedback end of the electric equipment is subjected to voltage reduction and rectification by the second voltage reduction rectification module, and then high level is output to the input end of the AND gate, and the positioning unit is started to start working;
s3, when a fault detection point of an electrical switch cabinet control loop connected with the input end of the first buck rectifying module in the positioning unit does not have a fault, the voltage input by the input end of the first buck rectifying module is input to the NOT gate after buck rectification, the NOT gate receives high-level signals output by the output ends of the first buck rectifying module and the second buck rectifying module and then outputs low level to the AND gate, and the output end of the AND gate outputs low level to the zero setting input end of the trigger; at the moment, the output state of the trigger is kept unchanged, so that a high level is output to the fault alarm unit, and the fault alarm unit does not work;
s4, when a fault detection point of an electrical switch cabinet control loop connected with the input end of the first buck rectifying module in the positioning unit fails, no voltage signal is input to the input end of the first buck rectifying module, at the moment, a NOT gate connected with the output end of the first buck rectifying module outputs a high-level signal to an AND gate, and the output end of the AND gate outputs a high level to a trigger zero setting end; at the moment, the trigger outputs zero, outputs low level to the fault alarm unit, controls the fault alarm unit to alarm, and prompts the fault detection point of the control loop of the electrical switch cabinet connected with the input end of the first step-down rectifying module of the positioning unit to generate faults.
6. The method for locating a fault in a control loop of an electrical switchgear according to claim 5, wherein the fault alarm unit comprises a contactor and a light emitting diode, two terminals of a set of coils of the contactor are respectively and correspondingly connected with an output end of a trigger and a power supply, and the working state of the contactor is controlled through the output of the trigger; the direct current power supply is connected with a pair of contacts of the contactor and the light-emitting diode in series and then grounded, and the on-off of the light-emitting diode is controlled through the working state of the contactor.
7. The method for locating a fault in a control loop of an electrical switching cabinet according to claim 5, wherein the reset circuit comprises a reset switch, an electrolytic capacitor and a resistor, wherein an input end of the trigger is grounded through the resistor, the input end of the trigger is connected with a direct current power supply through the reset switch and the electrolytic capacitor which are connected in parallel, and the reset switch resets the trigger;
the trigger is an RS trigger or a JK trigger; in each positioning unit, a first photoelectric coupler is connected between the first buck rectifying module and the NOT gate input end, and a second photoelectric coupler is connected between the second buck rectifying module and the AND gate input end;
When the number of the positioning units is multiple, the second buck rectification modules connected with the input ends of the AND gates of the positioning units are identical, and the reset circuits connected with the triggers of the positioning units are identical.
8. The method for locating a fault in a control loop of an electrical switchgear according to claim 5, wherein the fault alarm unit comprises a contactor and a light emitting diode, two terminals of a set of coils of the contactor are respectively and correspondingly connected with an output end of a trigger and a power supply, and the direct current power supply is connected with a pair of contacts of the contactor and the light emitting diode in series and then grounded;
in the step S3, when the output end of the trigger outputs a high level, a group of coils of the contactor connected with the trigger are not electrified, the contactor is not operated at this time, a pair of contacts connected with the light emitting diode in the contactor are in an on state, and the light emitting diode is not lightened;
in the step S4, when the output end of the trigger outputs a low level, a group of coils of the contactor connected with the trigger are energized, the contactor works at this time, a pair of contacts connected with the light emitting diode in the contactor are in a closed state, and the light emitting diode is lightened; and prompting a fault detection point of an electrical switch cabinet control loop connected with the input end of the first step-down rectifying module of the positioning unit to generate a fault.
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| CN110365328B (en) * | 2018-03-26 | 2023-01-20 | 宝山钢铁股份有限公司 | Alarm logic control circuit under same light word tablet |
| CN108735321A (en) * | 2018-06-22 | 2018-11-02 | 江苏核电有限公司 | A kind of control loop power supply is in alarm device and its verification method |
| CN109491295B (en) * | 2018-12-05 | 2020-06-16 | 岭澳核电有限公司 | Control system |
| CN109510550B (en) * | 2018-12-17 | 2024-01-30 | 安徽海螺集团有限责任公司 | Motor control system of cement kiln flue gas carbon capture system |
| CN111769821A (en) * | 2020-06-30 | 2020-10-13 | 曙光信息产业(北京)有限公司 | Latch alarm circuit and electronic equipment |
| CN111845850B (en) * | 2020-07-28 | 2022-03-29 | 山西世恒铁路技术有限公司 | Subway track monitoring circuit |
| CN114314189B (en) * | 2021-12-30 | 2023-11-03 | 苏州盛虹纤维有限公司 | Control system and control method for windows winding unit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07203029A (en) * | 1993-12-28 | 1995-08-04 | Fujitsu Ltd | Fault monitor system for switchboard |
| CN2713481Y (en) * | 2004-06-30 | 2005-07-27 | 宝山钢铁股份有限公司 | Electric loop contact fault detector |
| CN201780360U (en) * | 2010-08-20 | 2011-03-30 | 镇江华东电力设备制造厂 | Operation loop testing circuit for electric power protecting equipment |
| CN202110240U (en) * | 2011-05-10 | 2012-01-11 | 山东鲁亿通智能电气股份有限公司 | Switch cabinet current fault detection device |
| CN104635194A (en) * | 2013-11-08 | 2015-05-20 | 中国石油天然气股份有限公司 | Online fault monitoring and timing device for three-phase metering circuit |
| CN206281921U (en) * | 2016-12-30 | 2017-06-27 | 华润水泥技术研发有限公司 | The positioner of failure in cabinet control loop |
-
2016
- 2016-12-30 CN CN201611255913.3A patent/CN106771758B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07203029A (en) * | 1993-12-28 | 1995-08-04 | Fujitsu Ltd | Fault monitor system for switchboard |
| CN2713481Y (en) * | 2004-06-30 | 2005-07-27 | 宝山钢铁股份有限公司 | Electric loop contact fault detector |
| CN201780360U (en) * | 2010-08-20 | 2011-03-30 | 镇江华东电力设备制造厂 | Operation loop testing circuit for electric power protecting equipment |
| CN202110240U (en) * | 2011-05-10 | 2012-01-11 | 山东鲁亿通智能电气股份有限公司 | Switch cabinet current fault detection device |
| CN104635194A (en) * | 2013-11-08 | 2015-05-20 | 中国石油天然气股份有限公司 | Online fault monitoring and timing device for three-phase metering circuit |
| CN206281921U (en) * | 2016-12-30 | 2017-06-27 | 华润水泥技术研发有限公司 | The positioner of failure in cabinet control loop |
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