CN116632789A - Comprehensive online monitoring, analyzing and protecting method and system for switch cabinet - Google Patents
Comprehensive online monitoring, analyzing and protecting method and system for switch cabinet Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 181
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for switches
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Abstract
The invention discloses a comprehensive online monitoring, analyzing and protecting method and system for a switch cabinet, and belongs to the technical field of power equipment monitoring. Comprising the following steps: preconfiguring control modulenA plurality of monitoring modules; self-checking based on the control module and selecting in a state of successful self-checkingmMonitoring modules and willmThe individual monitoring modules are defined as monitoring modulesΨ (n→m) The method comprises the steps of carrying out a first treatment on the surface of the Acquisition monitoring moduleΨ (n→m) Each monitoring module in the system correspondingly monitors the obtained current dataζ 1 ，ζ 2 ，...，ζ m The method comprises the steps of carrying out a first treatment on the surface of the Will beζ 1 ，ζ 2 ，...，ζ m Comparing the judgment conditions corresponding to the judgment conditions: and if all the current data meet the judging conditions, judging that the fault exists. The invention monitors the current, temperature, arc light and other aspects of the switch cabinet; through algorithm, defect recognition is achievedOtherwise, early warning is carried out in advance, and the failure omission ratio is reduced.
Description
Technical Field
The invention belongs to the technical field of power equipment monitoring, and particularly relates to a comprehensive online monitoring, analyzing and protecting method and system for a switch cabinet.
Background
Petrochemical company occurrencePTThe explosion of the cabinet causes the power failure of a certain section of bus, and the main reasons of the accidents are thatPTThere are manufacturing quality defects and the lack of corresponding trend change monitoring leads to an enlargement of the hidden trouble into equipment failure. Also a petrochemical company generates 35kVAnd the three-phase short circuit fault of the incoming line cabinet causes the accident that the low voltage is in power grid interference. The main reason of the accident is that the management and monitoring of the running state of the incoming line cabinet are lack, so that the potential insulation hazard of the switch cabinet cannot be found in time, and the three-phase short circuit fault is developed.
The above cases reflect that the traditional electric equipment operation maintenance-manual periodic inspection mode cannot adapt to the development of enterprises, and mainly highlight the following problems:
(1) For sudden and repeated electrical equipment faults, the problem can not be found in time by manual inspection, defect elimination treatment can not be effectively performed in time, and the situation of missing leak detection can occur.
(2) The manual inspection is discontinuous in equipment running state data acquisition, and effective electric state data trend cannot be established.
(3) The manual regular electrified detection can have a large number of artificial subjective factors, different operation modes of different personnel can generate different detection results for the same equipment, and the distortion of equipment state analysis is caused.
Disclosure of Invention
The invention aims to: in order to solve the problems, the invention provides a comprehensive online monitoring, analyzing and protecting method and system for a switch cabinet.
The technical scheme is as follows: a comprehensive online monitoring, analyzing and protecting method for a switch cabinet comprises the following steps:
preconfigured control modules and connections theretonThe monitoring modules at least comprise the following working states: input monitoring stateφ x And exit the monitoring stateφ y ；
Based on the control module, self-checking data are obtained, and whether the self-checking data meet self-checking standards is judged: if yes, judging that the operation is in a normal operation state, and sending out a first display signal at a preset frequency; otherwise, judging the abnormal operation state and sending out a second display signal;
in the normal operation state, all monitoring modules are selected based on requirementsmEach monitoring module and is endowed with new definition as the monitoring moduleΨ (n→m) The method comprises the steps of carrying out a first treatment on the surface of the Monitoring moduleΨ (n→m) The working state of each monitoring module in the system is set as followsφ x ；
Real-time acquisition monitoring moduleΨ (n→m) Each monitoring module in the system correspondingly monitors the obtained current dataζ 1 ，ζ 2 ，...，ζ m The method comprises the steps of carrying out a first treatment on the surface of the Will respectivelyζ 1 ，ζ 2 ，...，ζ m Analyzing the corresponding judgment conditions to obtain an analysis result: if all the current data meet the judging conditions, judging that no fault exists; otherwise, judging that the fault exists, sending out a corresponding instruction, and recording the sending time point of the corresponding instruction;
and generating a fault information set in order of time points based on the current data which does not meet the judging conditions, the corresponding monitoring module and the sending time points of the corresponding instructions.
In a further embodiment, the current data includes the following types: current data, illumination data, temperature data, and partial discharge data;
correspondingly, the determination conditions include the following types: a determination condition regarding current data, a determination condition regarding illumination data, a determination condition regarding temperature data, and a determination condition of partial discharge data.
In a further embodiment, when the current data is current data, the corresponding analysis result acquisition flow is as follows:
the current data at least comprises the following data:、/>、/>will->、/>、/>Corresponds to and decides->、/>、/>Comparative analysis was performed with the following analysis results:
；
wherein ,is overcurrentISegment, overcurrentIISegment, overcurrentIIIMonitoring three-phase current in the segment; />Respectively correspond to overcurrentISegment, overcurrentIISegments, or overflowIIIThe length of the segment is defined by,irespectively correspond toaThe phase of the liquid phase is selected,bphase, orcA phase;
；
wherein ,is the current of the three-phase load;
；
wherein ,is the current zero sequence current value.
In a further embodiment, when the current data is illumination data, the corresponding analysis result acquisition flow is as follows:
the illumination data comprises the current illuminanceWill->And illuminance constant->Comparative analysis was performed with the following analysis results:
。
in a further embodiment, when the current data is temperature data, the corresponding analysis result acquisition flow is as follows:
the temperature data comprises the current temperature valueWill->Is>Comparative analysis was performed with the following analysis results:
。
in a further embodiment, when the current data is partial discharge data, the corresponding analysis result acquisition flow is as follows:
the partial discharge data comprises a preset number of timesDAll partial discharge data in alternating current periodThe method comprises the steps of carrying out a first treatment on the surface of the If all partial discharge dataAre all greater than threshold->Indicating that a fault exists; otherwise, no fault is indicated.
In a further embodiment, determining whether the self-test data meets the self-test criteria comprises the steps of:
the self-checking data obtained at least comprisesCPUThe self-checking data comprises self-checking data of a memory, a power supply, an input loop and an output loop;
if it isCPUThe self-checking data of the memory, the power supply, the input loop and the output loop all meet the self-checking conditions corresponding to the self-checking data, and the self-checking data meet the self-checking standard; and otherwise, the self-checking data does not accord with the self-checking standard.
In a further embodiment, when there is a fault, the following steps are performed:
when judging that the fault exists, sending out a tripping or alarming instruction, and recording the sending time point of the tripping or alarming instructionThe method comprises the steps of carrying out a first treatment on the surface of the Based on the current data which does not meet the judging condition, and a monitoring module and a +.>Generating a fault information set in order of time points; and based on the fault information set, performing corresponding maintenance.
In another technical scheme, a system for comprehensively and online monitoring, analyzing and protecting a switch cabinet is provided, which is used for realizing the method for comprehensively and online monitoring, analyzing and protecting the switch cabinet, and the system comprises:
a first module for pre-configuring the control module and the connection theretonThe monitoring modules at least comprise the following working states: input monitoring stateφ x And exit the monitoring stateφ y ；
The second module is used for acquiring self-checking data based on the control module and judging whether the self-checking data accords with the self-checking standard or not: if yes, judging that the operation is in a normal operation state, and sending out a first display signal at a preset frequency; otherwise, judging the abnormal operation state and sending out a second display signal;
a third module for selecting from all monitoring modules based on requirements under normal operation statemEach monitoring module and is endowed with new definition as the monitoring moduleΨ (n→m) The method comprises the steps of carrying out a first treatment on the surface of the Monitoring moduleΨ (n→m) The working state of each monitoring module in the system is set as followsφ x ；
A fourth module for acquiring the monitoring module in real timeΨ (n→m) Each monitoring module in the system correspondingly monitors the obtained current dataζ 1 ，ζ 2 ，...，ζ m The method comprises the steps of carrying out a first treatment on the surface of the Dividing intoWill be respectivelyζ 1 ，ζ 2 ，...，ζ m Analyzing the corresponding judgment conditions to obtain an analysis result: if all the current data meet the judging conditions, judging that no fault exists; otherwise, judging that the fault exists, sending out a corresponding instruction, and recording the sending time point of the corresponding instruction;
and a fifth module, configured to generate a fault information set in order of time points based on the current data that does not meet the determination condition and the corresponding monitoring module and the issue time point of the corresponding instruction.
The beneficial effects are that: by arranging a plurality of monitoring modules, such as an overcurrent three-section monitoring module, an overload monitoring module, a zero-sequence overcurrent monitoring module, an arc light monitoring module, a wireless temperature measuring monitoring module, a partial discharge monitoring module, a smoke sensing module and an infrared temperature measuring module; and acquiring current data, illumination data, temperature data, partial discharge data and the like of the monitored object, monitoring the monitored object, immediately judging that a fault exists at a corresponding monitoring position once the acquired data does not accord with a preset value, and then tripping or alarming to realize multi-face monitoring.
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FIG. 1 is a flow chart of a method of the present invention.
Detailed Description
Example 1
The embodiment provides a comprehensive online monitoring, analyzing and protecting method (hereinafter referred to as the method) for a switch cabinet, and the method is realized based on an online power monitoring and protecting device which monitors a medium-voltage switch cabinet. The device consists of a current voltage unit, an arc light unit,CTThe wireless temperature unit, the smoke sensing unit, the partial discharge unit, the infrared imaging and shooting unit and the control unit are connected with the control unit in a communication way and can be used for 110kVAnd various industrial and mining enterprises and power industries of the following voltage classes. The following developments illustrate the method:
a comprehensive online monitoring, analyzing and protecting method for a switch cabinet comprises the following steps:
S100. preconfigured control modules and connections theretonThe monitoring modules at least comprise the following working states: input monitoring stateφ x And exit the monitoring stateφ y 。
For the omnibearing monitoring of the medium-voltage switch cabinet, a control module and a control system are arrangednA plurality of monitoring modules, whereinnThe individual monitoring modules include at least: the device comprises an overcurrent three-section monitoring module, an overload monitoring module, a zero sequence overcurrent monitoring module, an arc light monitoring module, a wireless temperature measuring monitoring module, a partial discharge monitoring module, a smoke sensing module and an infrared temperature measuring module. In the present embodiment, the state of monitoring is put intoφ x The monitoring module is put into use. Exit the monitoring stateφ y The monitoring module is withdrawn, which means that the monitoring module does not participate in monitoring.
S200. Based on the control module, self-checking data are obtained, and whether the self-checking data meet self-checking standards is judged: if yes, judging that the operation is in a normal operation state, and sending out a first display signal at a preset frequency; otherwise, the abnormal operation state is judged, and a second display signal is sent out.
Before monitoring, the device is arranged in the control moduleCPUEach main component needs self-checking to obtain corresponding self-checking data, and if the self-checking data accords with the self-checking standard, the device is representedCPUAnd each main component is in a normal operation device, and sends out a first display signal at a preset frequency, for example, an operation indicator lamp is set, a green light of the operation indicator lamp flashes 1 time per second, and a fault lamp is set, so that the fault lamp is not lighted. If the self-checking data does not accord with the self-checking standard, the abnormal operation state is judged, and a second display signal is sent out, if the flicker frequency of the operation indicator lamp is not fixed, the fault lamp is lighted to light a red lamp. If the device is in an abnormal operation state, the components of the device need to be overhauled.
S300. In the normal operation state, all monitoring modules are selected based on requirementsmEach monitoring module and is endowed with new definition as the monitoring moduleΨ (n→m) The method comprises the steps of carrying out a first treatment on the surface of the Monitoring moduleΨ (n→m) The working state of each monitoring module in (a)State is set asφ x 。
The device described aboveCPUUnder the normal running state of all main components, based on the actual requirements of the monitoring of the medium-voltage switch cabinet, if several aspects in the medium-voltage switch cabinet are monitored, the components are assembledΨ={ψ 1 ,ψ 2 ,...,ψ n Selection ofmAnd a monitoring module, wherein,m≤n. Monitoring moduleΨ (n→m) The operating state of each of the monitoring modules is set to be put into service (i.e., transition from the exit state to the put-into-service state). The monitoring module put into use detects and acquires the data corresponding to the monitoring in real time and transmits the data to the monitoring moduleCPUIs a kind of medium.
S400. Real-time acquisition monitoring moduleΨ (n→m) Each monitoring module in the system correspondingly monitors the obtained current dataζ 1 ，ζ 2 ，...，ζ m The method comprises the steps of carrying out a first treatment on the surface of the Will respectivelyζ 1 ，ζ 2 ，...，ζ m Analyzing the corresponding judgment conditions to obtain an analysis result: if all the current data meet the judging conditions, judging that no fault exists; otherwise, judging that the fault exists, sending out a corresponding instruction, and recording the sending time point of the corresponding instruction.
The current data monitored by each of the usage monitoring modules is set as:ζ 1 ，ζ 2 ，...，ζ m the method comprises the steps of carrying out a first treatment on the surface of the Since each monitoring module monitors different objects, the evaluation criteria of the current data are also different. Respectively one by one the current dataζ 1 ，ζ 2 ，...，ζ m Comparing with the corresponding judging conditions to obtain a comparison result, wherein the comparison result comprisesmAnd each. If it ismThe comparison results all show that the current data all meet the judgment conditions, and then the monitored medium-voltage switch cabinet is judged to be fault-free; otherwise, if one or more comparison results do not meet the judgment conditions, judging that the monitored medium-voltage switch cabinet has faults, sending corresponding instructions such as tripping or alarming, and recording the corresponding instructionsA point in time at which the response instruction was issued.
S500. And generating a fault information set in order of time points based on the current data which does not meet the judging conditions, the corresponding monitoring module and the sending time points of the corresponding instructions.
When a fault exists, the following steps are performed: when judging that the fault exists, sending out a tripping or alarming instruction, and recording the sending time point of the tripping or alarming instructionThe method comprises the steps of carrying out a first treatment on the surface of the Based on the current data which does not meet the judging condition, and a monitoring module and a +.>Generating a fault information set in order of time points; and based on the fault information set, performing corresponding maintenance.
In other words, for the current data which does not meet the judgment condition, the corresponding monitoring module is determined. Generating a fault information set in order of time points by the current and corresponding monitoring modules which do not meet the judging conditions and the time points of the sending of the response instructions. The information contained in the fault information set represents the approximate time point of the fault of the medium-voltage switch cabinet, the position of the fault and the data of the fault, and the later maintenance is convenient based on the information.
S201. The step of judging whether the self-checking data accords with the self-checking standard comprises the following steps:
the self-checking data obtained at least comprisesCPUThe self-checking data comprises self-checking data of a memory, a power supply, an input loop and an output loop; if it isCPUThe self-checking data of the memory, the power supply, the input loop and the output loop all meet the self-checking conditions corresponding to the self-checking data, and the self-checking data meet the self-checking standard; and otherwise, the self-checking data does not accord with the self-checking standard.
CPUThe self-test data of the memory, the power supply, the input circuit and the output circuit and the self-test conditions corresponding to the self-test data are judged as follows:
(1) Device and method for controlling the sameCPUThe self-checking data of the instruction function self-checking data and the interrupt system self-checking data are included in the self-checking data of the instruction function self-checking data: combining the operation instruction, the transmission instruction, the jump instruction and the logic instruction into an instruction block with an operation function, and judging by utilizing the result of the instruction blockCPUIf the result is correct, then the instruction function of (2) indicatesCPUIf the instruction function of (2) is normal, otherwise, the instruction function of (2) indicates abnormal operation; generating an interrupt signal by external hardware according toCPUChecking whether the system is operating normally or not in response to the interrupt, ifCPUAnd responding to the interrupt, indicating that the interrupt system operates normally, otherwise, indicating that the interrupt system operates abnormally.
(2) Memory self-test data: selecting a predetermined check mode, inputting the value into the memory in the predetermined check mode, reading, and observing whether the data change, thereby judging that the data is foundRAMThere may be faults.
(3) Power self-test data: by judging the analog signals and the analog-to-digital conversion results connected with the remaining two input ends of the multi-way switch, whether the power supply, the analog-to-digital converter, the multi-way switch and the like work normally or not can be determined.
(4) Inputting loop self-checking data: the method comprises the steps of sequentially carrying out analog-to-digital conversion on a tested alternating current signal twice in a sampling period, and if the results of the analog-to-digital conversion are consistent or the errors are within an allowable range, indicating that the holding function of the sampling holder is normal.
(5) Outputting loop self-checking data: a duplex outlet channel is typically used to send out the trip signal. And detecting single channel damage by using an exclusive OR logic structure by utilizing the non-corresponding relation of the two channels.
The above-mentioned monitoring objects of each monitoring module are different, and the obtained current data and the corresponding judging conditions are also different. Therefore, the process of discriminating the current data in each monitoring module is described in detail below.
The current data includes the following types: current data, illumination data, temperature data, and partial discharge data; correspondingly, the determination conditions include the following types: a determination condition regarding current data, a determination condition regarding illumination data, a determination condition regarding temperature data, and a determination condition of partial discharge data.
S401. When the current data is current data, the corresponding analysis result acquisition flow is as follows:
the current data at least comprises the following data:、/>、/>will->、/>、/>Corresponds to and decides->、/>、/>Comparative analysis was performed with the following analysis results:
（1）；
wherein ,is overcurrentISegment, overcurrentIISegment, overcurrentIIIMonitoring three-phase current in the segment; />The values of 1, 2, 3,1, 2 and 3 are respectively corresponding to overcurrentISegment, overcurrentIISegment, overcurrentIIIThe length of the segment is defined by,ivalue takinga、b、c，a、b、cRespectively correspond toaThe phase of the liquid phase is selected,bthe phase of the liquid phase is selected,cand (3) phase (C).
The concrete explanation is as follows: when monitoring moduleΨ (n→m) The method comprises an overcurrent three-section monitoring module, namely, when the overcurrent three-section monitoring module is adopted for monitoring, the current data obtained by monitoring the overcurrent three-section monitoring module is obtained。/>Comprises the following steps:I a 1 ，I b 1 ，I c 1 ，I a 2 ，I b 2 ，I c 2 ，I a 3 ，I b 3 ，I c 3 。/>comprises the following steps:O 1 ，O 2 ，O 3 . The analytical comparison results are as follows:
overcurrent flowIReal-time monitoring of three-phase current in a segment:I a 1 ，I b 1 ，I c 1 will beI a 1 ，I b 1 ，I c 1 Respectively and constant valueO 1 Comparing to obtain a comparison result; if it isI a 1 ，I b 1 ，I c 1 Any phase current is larger than a fixed valueO 1 And judging that the fault exists, and issuing a tripping instruction after delay. Wherein the constant valueO 1 Is 6-8 times of the rated value of the current.
Overcurrent flowIIReal-time monitoring of the time of the segmentFront three-phase current:I a 2 ，I b 2 ，I c 2 and willI a 2 ，I b 2 ，I c 2 Respectively and constant valueO 2 Comparing to obtain a comparison result; if it isI a 2 ，I b 2 ，I c 2 Any phase current is larger than a fixed valueO 2 And judging that the fault exists, and issuing a tripping instruction after delay. Wherein the constant valueO 2 Is 2-3 times of the rated value of the current.
Overcurrent flowIIIReal-time monitoring of three-phase current in a segment:I a 3 ，I b 3 ，I c 3 and willI a 3 ，I b 3 ，I c 3 Respectively and constant valueO 3 Comparing to obtain a comparison result; if it isI a 3 ，I b 3 ，I c 3 Any phase current is larger than a fixed valueO 3 And judging that the fault exists, and issuing a tripping instruction after delay. Wherein the constant valueO 3 Is 1.5 times the current rating.
The three-section overcurrent protection is that the current is quick-break, the time-limited current is quick-break and the overcurrent protection are both protection which react to the increase of the current to act, and the three-section overcurrent protection and the current quick-break and the overcurrent protection are mutually matched to form a whole set of protection. The three sections differ mainly in the selection principle of the starting current. Wherein the quick break and time-limited quick break protection is set according to the maximum short-circuit current which avoids a certain point, and the overcurrent protection is set according to the maximum load current which avoids a certain point.
（2）； wherein ,/>Is the current of the three-phase load.
The concrete explanation is as follows: when monitoring moduleΨ (n→m) The overload monitoring module is used for acquiring current data obtained by monitoring the overload monitoring module when the overload monitoring module is used for monitoring。/>Comprises the following steps:I a f ，I b f ，I c f . The analytical comparison results are as follows:
the overload monitoring module monitors current three-phase load current in real time:I a f ，I b f ，I c f and willI a f ，I b f ，I c f And overload current constantO f Comparing to obtain a comparison result; if it isI a f ，I b f ，I c f Any phase load current is larger than overload current fixed valueO f And judging that the fault exists, and issuing a tripping instruction or an alarm instruction through delay. Wherein the overload current is constantO f Is 0.8 to 1.2 times of the rated value of the current.
Three-phase overload current protection refers to the thermal capacity of the device itself, i.e. overload protection.
（3）； wherein ,/>Is the current zero sequence current value.
The concrete explanation is as follows: when monitoring moduleΨ (n→m) The zero sequence overcurrent monitoring module is adopted to monitor, namely, when the zero sequence overcurrent monitoring module is adopted to monitor, the current data obtained by monitoring the zero sequence overcurrent monitoring module is obtained. The analytical comparison results are as follows:
real-time current zero sequence current value monitored by zero sequence overcurrent monitoring moduleAnd let it be equal to zero sequence overcurrent constant value +.>Comparing to obtain a comparison result; if the current zero sequence current value is larger than the zero sequence overcurrent constant value, judging that a fault exists, and issuing a tripping instruction or an alarm instruction through delay. Wherein zero sequence overcurrent constant value->Is 1.5 to 2A。
The zero sequence current protection means that a special zero sequence current transformer is adopted on the cable circuit to realize grounding protection. The neutral point direct grounding system generates grounding short circuit, generates large zero sequence current, forms protection by utilizing zero sequence current components, and can be used as main grounding short circuit protection. The zero sequence overcurrent protection does not reflect the short circuit of the three phases and the two phases, and no zero sequence component is generated during normal operation and system oscillation, so that the zero sequence overcurrent protection has better sensitivity.
S402. When the current data is illumination data, the corresponding analysis result acquisition flow is as follows:
the illumination data comprises the current illuminanceWill->And illuminance constant->Comparative analysis was performed with the following analysis results:
。
the concrete explanation is as follows: monitoring moduleΨ (n→m) The method comprises the steps of acquiring current data obtained by monitoring an arc light monitoring module, wherein the current data is illumination data.
Current illuminance monitored by arc light monitoring module in real timeAnd illuminance constant->Comparing to obtain a comparison result; if the current illuminance +>Is greater than the illuminance constant value->If the fault exists, a tripping instruction is sent out, otherwise, no fault is judged. Wherein the illuminance is constant->7500 to 8000 lux.
The arc light monitoring module adopts three cable type arc light sensors to monitor and is arranged on a division plate or a frame of the switch cabinet. Arc protection tripping mode: in addition to the above-described judgment modes, there is one judgment mode of: arc + current.
When the arc light unit transmits an optical signal (more than preset illuminance) from the arc light sensor to the main control unit, and the current reaches a starting value at the same time, the arc light protection action trips. The two arc protections are selected based on the actual application scenario.
S403. When the current data is temperature data, the corresponding analysis result acquisition flow is as follows:
the temperature data comprises the current temperature valueWill->Is>Comparative analysis was performed with the following analysis results:
。
the concrete explanation is as follows: monitoring moduleΨ (n→m) The system comprises a wireless temperature measurement monitoring module, wherein the current data obtained by monitoring the wireless temperature measurement monitoring module is obtained, and the current data comprises a current temperature value。
The current temperature value monitored by the wireless temperature measurement monitoring module in real timeIs>Comparing to obtain a comparison result; if the current temperature value->Greater than a temperature constant->Judging that a fault exists, and sending out a tripping instruction or an alarm instruction; otherwise, it is determined that there is no fault. Wherein the temperature is set at->75 to 80℃。
The wireless temperature monitoring unit has extremely high reliability and safety. By usingCTPassive wireless temperature sensor capable ofThe high-voltage power supply is directly arranged at electric joints where high temperature is easy to generate, such as each high-voltage switch contact, a bus connector, a cable lap joint, a transformer and the like, and can be used for measuring the real-time operating temperature data of high-voltage equipment.
The device can monitor 12 paths of wireless temperature signals, and 4 groups are formed; the three-phase power supply is characterized by comprising a cable head 3 point, a circuit breaker upper contact 3 point, a circuit breaker lower contact 3 point and an upper busbar 3 point, which are customized by a user according to the installation position. 4. And the temperature of one sensor in any group reaches a set value, and the device acts (trips or alarms) after time delay.
S404. When the current data is partial discharge data, the corresponding analysis result acquisition flow is as follows:
the partial discharge data comprises a preset number of timesDAll partial discharge data in alternating current periodThe method comprises the steps of carrying out a first treatment on the surface of the If all partial discharge dataAre all greater than threshold->Indicating that a fault exists; otherwise, no fault is indicated.
The concrete explanation is as follows: monitoring moduleΨ (n→m) The system comprises a partial discharge monitoring module, a partial discharge detection module and a control module, wherein the partial discharge detection module acquires preset timesDAll partial discharge data in alternating current period 。
In order to prevent false alarm of partial discharge, the partial discharge is always present because the problem is irreversible once the switching device is insulated, and a time parameter is added to the partial discharge alarm processing parameter, namely, a continuous 30 (in the embodimentD30, but not limited to 30) each of the partial discharge values is greater than the alarm threshold value (threshold value)) Time of dayAn alarm signal is generated, threshold +.>：-45 ~ - 40dbm。
The partial discharge monitoring module can realize partial discharge phenomena of the contact point part of the electrical equipment caused by factors such as material aging, poor contact, current overload and the like, and assist in eliminating hidden trouble. The partial discharge phenomenon is monitored by a partial discharge sensor and is arranged at the position of a cable chamber of a switch cabinet, etc. where the partial discharge phenomenon is easy to occur.
Example 2
The embodiment provides a comprehensive online monitoring, analyzing and protecting system for a switch cabinet, which is used for realizing the comprehensive online monitoring, analyzing and protecting method for the switch cabinet in the embodiment 1, and comprises the following steps:
a first module for pre-configuring the control module and the connection theretonThe monitoring modules at least comprise the following working states: input monitoring stateφ x And exit the monitoring stateφ y ；
The second module is used for acquiring self-checking data based on the control module and judging whether the self-checking data accords with the self-checking standard or not: if yes, judging that the operation is in a normal operation state, and sending out a first display signal at a preset frequency; otherwise, judging the abnormal operation state and sending out a second display signal;
a third module for selecting from all monitoring modules based on requirements under normal operation statemEach monitoring module and is endowed with new definition as the monitoring moduleΨ (n→m) The method comprises the steps of carrying out a first treatment on the surface of the Monitoring moduleΨ (n→m) The working state of each monitoring module in the system is set as followsφ x ；
A fourth module for acquiring the monitoring module in real timeΨ (n→m) Each monitoring module in the system correspondingly monitors the obtained current dataζ 1 ，ζ 2 ，...，ζ m The method comprises the steps of carrying out a first treatment on the surface of the Will respectivelyζ 1 ，ζ 2 ，...，ζ m Corresponding to itAnalyzing the judging conditions to obtain an analysis result: if all the current data meet the judging conditions, judging that no fault exists; otherwise, judging that the fault exists, sending out a corresponding instruction, and recording the sending time point of the corresponding instruction;
and a fifth module, configured to generate a fault information set in order of time points based on the current data that does not meet the determination condition and the corresponding monitoring module and the issue time point of the corresponding instruction.
Claims (9)
1. The comprehensive online monitoring, analyzing and protecting method for the switch cabinet is characterized by comprising the following steps of:
preconfigured control modules and connections theretonThe monitoring modules at least comprise the following working states: input monitoring stateφ x And exit the monitoring stateφ y ；
Based on the control module, self-checking data are obtained, and whether the self-checking data meet self-checking standards is judged: if yes, judging that the operation is in a normal operation state, and sending out a first display signal at a preset frequency; otherwise, judging the abnormal operation state and sending out a second display signal;
in the normal operation state, all monitoring modules are selected based on requirementsmEach monitoring module and is endowed with new definition as the monitoring moduleΨ (n→m) The method comprises the steps of carrying out a first treatment on the surface of the Monitoring moduleΨ (n→m) The working state of each monitoring module in the system is set as followsφ x ；
Real-time acquisition monitoring moduleΨ (n→m) Each monitoring module in the system correspondingly monitors the obtained current dataζ 1 ，ζ 2 ，...，ζ m The method comprises the steps of carrying out a first treatment on the surface of the Will respectivelyζ 1 ，ζ 2 ，...，ζ m Analyzing the corresponding judgment conditions to obtain an analysis result: if all the current data meet the judging conditions, judging that no fault exists; otherwise, judging that the fault exists, sending out a corresponding instruction, and recording the sending time point of the corresponding instruction;
and generating a fault information set in order of time points based on the current data which does not meet the judging conditions, the corresponding monitoring module and the sending time points of the corresponding instructions.
2. The method for comprehensive on-line monitoring, analysis and protection of a switchgear according to claim 1, wherein the current data comprises the following types: current data, illumination data, temperature data, and partial discharge data;
correspondingly, the determination conditions include the following types: a determination condition regarding current data, a determination condition regarding illumination data, a determination condition regarding temperature data, and a determination condition of partial discharge data.
3. The method for comprehensively and online monitoring, analyzing and protecting a switch cabinet according to claim 1, wherein when the current data is current data, the corresponding analysis result acquisition flow is as follows:
the current data at least comprises the following data:、/>、/>will->、/>、/>Corresponds to and decides->、/>、/>Comparative analysis was performed with the following analysis results:
；
wherein ,is overcurrentISegment, overcurrentIISegment, overcurrentIIIMonitoring three-phase current in the segment; />Respectively correspond to overcurrentISegment, overcurrentIISegments, or overflowIIIThe length of the segment is defined by,irespectively correspond toaThe phase of the liquid phase is selected,bphase, orcA phase;
；
wherein ,is the current of the three-phase load;
；
wherein ,is the current zero sequence current value.
4. The method for comprehensively and online monitoring, analyzing and protecting a switch cabinet according to claim 1, wherein when the current data is illumination data, the corresponding analysis result acquisition flow is as follows:
the illumination data comprises the current illuminanceWill->And illuminance constant->Comparative analysis was performed with the following analysis results:
。
5. the method for comprehensively and online monitoring, analyzing and protecting a switch cabinet according to claim 1, wherein when the current data is temperature data, the corresponding analysis result acquisition flow is as follows:
the temperature data comprises the current temperature valueWill->Is>Comparative analysis was performed with the following analysis results:
。
6. the method for comprehensively and online monitoring, analyzing and protecting a switch cabinet according to claim 1, wherein when the current data is partial discharge data, the corresponding analysis result acquisition flow is as follows:
the partial discharge data comprises a preset number of timesDCycle of alternating currentAll partial discharge data inThe method comprises the steps of carrying out a first treatment on the surface of the If all partial discharge data->Are all greater than threshold->Indicating that a fault exists; otherwise, no fault is indicated.
7. The method for comprehensive on-line monitoring, analysis and protection of a switchgear according to claim 1, wherein determining whether the self-test data meets the self-test criteria comprises the steps of:
the self-checking data obtained at least comprisesCPUThe self-checking data comprises self-checking data of a memory, a power supply, an input loop and an output loop;
if it isCPUThe self-checking data of the memory, the power supply, the input loop and the output loop all meet the self-checking conditions corresponding to the self-checking data, and the self-checking data meet the self-checking standard; and otherwise, the self-checking data does not accord with the self-checking standard.
8. The method for comprehensive on-line monitoring, analysis and protection of a switchgear according to claim 1, wherein when there is a fault, the following steps are performed:
when judging that the fault exists, sending out a tripping or alarming instruction, and recording the sending time point of the tripping or alarming instructionThe method comprises the steps of carrying out a first treatment on the surface of the Based on the current data which does not meet the judging condition, and a monitoring module and a +.>Generating a fault information set in order of time points; and based on the fault information set, performing corresponding maintenance.
9. A comprehensive on-line monitoring, analyzing and protecting system for a switchgear, for implementing a comprehensive on-line monitoring, analyzing and protecting method for a switchgear according to any one of claims 1 to 8, the system comprising:
a first module for pre-configuring the control module and the connection theretonThe monitoring modules at least comprise the following working states: input monitoring stateφ x And exit the monitoring stateφ y ；
The second module is used for acquiring self-checking data based on the control module and judging whether the self-checking data accords with the self-checking standard or not: if yes, judging that the operation is in a normal operation state, and sending out a first display signal at a preset frequency; otherwise, judging the abnormal operation state and sending out a second display signal;
a third module for selecting from all monitoring modules based on requirements under normal operation statemEach monitoring module and is endowed with new definition as the monitoring moduleΨ (n→m) The method comprises the steps of carrying out a first treatment on the surface of the Monitoring moduleΨ (n→m) The working state of each monitoring module in the system is set as followsφ x ；
A fourth module for acquiring the monitoring module in real timeΨ (n→m) Each monitoring module in the system correspondingly monitors the obtained current dataζ 1 ，ζ 2 ，...，ζ m The method comprises the steps of carrying out a first treatment on the surface of the Will respectivelyζ 1 ，ζ 2 ，...，ζ m Analyzing the corresponding judgment conditions to obtain an analysis result: if all the current data meet the judging conditions, judging that no fault exists; otherwise, judging that the fault exists, sending out a corresponding instruction, and recording the sending time point of the corresponding instruction;
and a fifth module, configured to generate a fault information set in order of time points based on the current data that does not meet the determination condition and the corresponding monitoring module and the issue time point of the corresponding instruction.
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| CN205753370U (en) * | 2016-04-15 | 2016-11-30 | 北京劳动保障职业学院 | A kind of arc light protecting system |
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