CN110927621A - Grounding detection positioning system for closed friction electric track of conveying chain - Google Patents
Grounding detection positioning system for closed friction electric track of conveying chain Download PDFInfo
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- CN110927621A CN110927621A CN201911100648.5A CN201911100648A CN110927621A CN 110927621 A CN110927621 A CN 110927621A CN 201911100648 A CN201911100648 A CN 201911100648A CN 110927621 A CN110927621 A CN 110927621A
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- 238000001514 detection method Methods 0.000 title claims abstract description 41
- 230000016507 interphase Effects 0.000 claims abstract description 31
- 238000012544 monitoring process Methods 0.000 claims abstract description 22
- 238000009413 insulation Methods 0.000 claims abstract description 11
- 230000003993 interaction Effects 0.000 claims description 3
- 230000008054 signal transmission Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 9
- 230000007547 defect Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
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Abstract
The invention discloses a grounding detection positioning system of a transportation chain closed friction electric track, which comprises a three-phase bus, a bus voltage acquisition unit, a detection voltage acquisition unit, a main control unit and a monitoring unit of a friction electric track power supply system; the bus voltage acquisition unit and the detection voltage acquisition unit respectively acquire voltage signals of a three-phase bus and a ground circuit, and the main control unit carries out insulation monitoring, single-phase grounding point positioning calculation and interphase short circuit point positioning calculation on the ground circuit according to the voltage signals acquired by the bus voltage acquisition unit and the detection voltage acquisition unit; the monitoring unit displays the acquired voltage signals in real time, and the single-phase grounding point position and the interphase short-circuit point position of the electric road are visually displayed according to the specific number of the electric road. The system overcomes the defect of ground fault maintenance of the traditional power supply system of the motorcycle track, realizes the positioning of the ground point and the interphase short-circuit point under the condition that the motorcycle track is not disassembled, effectively improves the maintenance operation efficiency, and ensures the high-efficiency and reliable operation of equipment.
Description
Technical Field
The invention relates to the technical field of automatic control of electrical equipment, in particular to a grounding detection positioning system for a closed friction track of a conveying chain.
Background
The transportation chain seals the friction electric track to realize that the hot-rolled coil is transported from the hot-rolling production line to the cold-rolling production line, the friction electric track is generally longer (about 1000 meters), supplies power by sections, and consists of a plurality of (258) friction electric tracks. The power supply mode is usually an ungrounded system, the continuity of operation is favorably ensured, the power supply of the power generation system is realized through an isolation transformer, and the whole power supply system of the power generation system is connected into a whole at a power generation system rail bus bar, namely all the multi-path power supply switches are connected in parallel for operation.
Because the triboelectric circuit adopts a closed form, the equipment spot inspection can only see the outer devices such as the shell, the hanging part and the like, and the internal structure can not be observed at all. The maintenance and inspection of the internal structure can only be implemented by means of periodic items when the equipment is stopped and overhauled.
Because the power supply system of the power transmission line is an ungrounded system, the power transmission line can still maintain operation when single-phase grounding occurs, and the equipment can not find out faults which occur by point inspection. When an interphase short circuit occurs, the grounding point is completely sealed inside the friction electric channel, and the grounding point can be found to remove the fault only by sectionally disassembling the whole friction electric channel during treatment, sectionally and gradually measuring the insulation state, and gradually approaching the fault point, so that the overhauling workload is large, the troubleshooting is long, the overhauling operation efficiency is low, and the normal operation of the equipment is seriously influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a grounding detection and positioning system for a closed friction electric track of a transport chain, which overcomes the defect of grounding fault maintenance of a traditional friction electric track power supply system, realizes the positioning of a grounding point and an interphase short-circuit point under the condition that a friction electric track is not disassembled, effectively improves the maintenance operation efficiency, and ensures the efficient and reliable operation of equipment.
In order to solve the technical problem, the grounding detection positioning system of the closed friction electric track of the conveying chain comprises a three-phase bus of a friction electric track power supply system, a bus voltage acquisition unit, a detection voltage acquisition unit, a main control unit and a monitoring unit;
the bus voltage acquisition unit is used for respectively acquiring phase voltages of the three-phase bus, when single-phase grounding occurs, the voltage of a grounding phase is close to zero, and the voltage of a non-grounding phase is changed from the phase voltages to line voltages;
the detection voltage acquisition unit is used for respectively acquiring the phase-to-phase voltage and the single-phase voltage-to-ground voltage of the friction circuit powered by the three-phase bus, and converting acquired signals into analog quantity signals of 4-20 mA through a transmitter;
the bus voltage acquisition unit and the detection voltage acquisition unit acquire signals and transmit the signals to the main control unit, and the main control unit carries out insulation monitoring, single-phase grounding point positioning calculation and interphase short circuit point positioning calculation on a single phase in a friction circuit according to the signals acquired by the bus voltage acquisition unit and the detection voltage acquisition unit;
the signal transmission of master control unit to the monitoring unit, the monitoring unit is man-machine interaction interface to the voltage signal that real-time display bus voltage acquisition unit and detection voltage acquisition unit gathered, according to the concrete serial number of electric road, the single-phase earth point position and the alternate short circuit point position of electric road of rubbing are directly perceived to be displayed.
Further, when the main control unit carries out insulation monitoring on a single phase in a friction circuit, whether the voltage of the single phase is close to zero or not is judged, whether the voltage of the other phase is changed from the phase voltage to the line voltage or not is judged, and if yes, the single phase is diagnosed as being grounded; when single-phase grounding detection is carried out, a power switch at the upper stage of the friction track is switched off, a direct current source is applied to the end point of the grounding phase and any ungrounded phase, and the grounding point is positioned at the position LGroundAccording to the calculation of the formula (1),
Lground＝L0×(2UGround/UPhase (C)) (1)
Wherein L is0Is the total length of the electric path, UGroundTo ground phase, UPhase (C)The phase-to-phase voltage is the voltage between the grounding phase and any ungrounded phase;
when interphase short circuit detection is carried out, the upper-level power switch of the triboelectric path is switched off, a direct current source is applied to any short circuit phase and ungrounded phase end point, and the interphase short circuit point is positioned at the L positionShort lengthAccording to the calculation of the formula (2),
Lshort length＝L0×(2UShort length/UIs not) (2)
Wherein, UIs notFor inter-phase voltage of non-short-circuited two phases of the circuit, UShort lengthIs the interphase voltage of two phases of the short circuit of the friction circuit.
The grounding detection positioning system for the closed friction electric track of the transport chain adopts the technical scheme, namely a three-phase bus, a bus voltage acquisition unit, a detection voltage acquisition unit, a main control unit and a monitoring unit of a friction electric track power supply system of the system; the bus voltage acquisition unit and the detection voltage acquisition unit respectively acquire voltage signals of a three-phase bus and a ground circuit, and the main control unit carries out insulation monitoring, single-phase grounding point positioning calculation and interphase short circuit point positioning calculation on the ground circuit according to the voltage signals acquired by the bus voltage acquisition unit and the detection voltage acquisition unit; the monitoring unit displays the acquired voltage signals in real time, and the single-phase grounding point position and the interphase short-circuit point position of the electric road are visually displayed according to the specific number of the electric road. The system overcomes the defect of ground fault maintenance of the traditional power supply system of the motorcycle track, realizes the positioning of the ground point and the interphase short-circuit point under the condition that the motorcycle track is not disassembled, effectively improves the maintenance operation efficiency, and ensures the high-efficiency and reliable operation of equipment.
Drawings
The invention is described in further detail below with reference to the following figures and embodiments:
fig. 1 is a schematic diagram of a grounding detection positioning system of a closed friction electric track of a transmission chain.
Detailed Description
Embodiment example as shown in fig. 1, the grounding detection positioning system for the closed friction track of the transportation chain comprises a three-phase bus 2 of a power supply system of a friction track 1, a bus voltage acquisition unit U1, a detection voltage acquisition unit U2, a main control unit U3 and a monitoring unit U4;
the bus voltage acquisition unit U1 respectively acquires phase voltages of the three-phase bus 2, when single-phase grounding occurs, the voltage of a grounding phase is close to zero, and the voltage of a non-grounding phase is changed from the phase voltages to line voltages;
the detection voltage acquisition unit U2 is used for respectively acquiring the phase-to-phase voltage and the single-phase voltage-to-ground of the power-supplied friction circuit 1 of the three-phase bus 2, and converting acquired signals into analog quantity signals of 4-20 mA through a transmitter;
signals collected by the bus voltage collecting unit U1 and the detection voltage collecting unit U2 are transmitted to the main control unit U3, and the main control unit U3 carries out insulation monitoring, single-phase grounding point positioning calculation and interphase short circuit point positioning calculation on a single phase in the friction electric channel 1 according to the signals collected by the bus voltage collecting unit U1 and the detection voltage collecting unit U2;
the signal transmission of main control unit U3 extremely the monitor unit U4, monitor unit U4 is human-computer interaction interface, and shows in real time the voltage signal that bus voltage acquisition unit U1 and detection voltage acquisition unit U2 gathered, according to the concrete serial number of electric road 1, the single-phase earth point position and the alternate short circuit point position of electric road 1 are rubbed in the visual display.
Preferably, when the main control unit U3 performs insulation monitoring on a single phase in the power transmission line 1, it is determined whether the voltage of the single phase is close to zero, and whether the voltage of the remaining phase is changed from the phase voltage to the line voltage, if yes, it is diagnosed that the single phase is grounded; if the grounding phase is A phase, the grounding phase is grounded to the voltage UA0Zero, B is in voltage U relative to groundB0Changing from 220V to 380V, C is relatively earthed voltage UC0The voltage is changed from 220V to 380V, so that the single-phase grounding phase can be positioned through voltage change;
when single-phase grounding detection is carried out, a power switch at the upper stage of the friction track is switched off, a direct current source is applied to the end point of the grounding phase and any ungrounded phase, and the grounding point is positioned at the position LGroundAccording to the calculation of the formula (1),
Lground＝L0×(2UGround/UPhase (C)) (1)
Wherein L is0Is the total length of the electric path, UGroundTo ground phase, UPhase (C)The phase-to-phase voltage is the voltage between the grounding phase and any ungrounded phase;
in practical detection, assuming that a triboelectric circuit C is connected with the ground, ends B1 and C1 of B, C phases are taken as test ends, ends B2 and C2 of the other phases are shorted by a short-circuit switch 3, direct current sources are applied to ends B1 and C1, and the phase-to-phase voltage U B, C is measuredBCC voltage to ground UC0The total length of the track 1 of the motorcycle track is L0，
The position of the grounding point LGround(starting from point C1):
Lground＝L0×(2UC0/UBC)
When interphase short circuit detection is carried out, the upper-level power switch of the triboelectric path is switched off, a direct current source is applied to any short circuit phase and ungrounded phase end point, and the interphase short circuit point is positioned at the L positionShort lengthAccording to the calculation of the formula (2),
Lshort length＝L0×(2UShort length/UIs not) (2)
Wherein, UIs notFor inter-phase voltage of non-short-circuited two phases of the circuit, UShort lengthIs the interphase voltage of two phases of the short circuit of the friction circuit.
In practical detection, assuming that interphase short circuit of a triboelectric path B, C occurs, one end A1 and B1 of A, B phases are taken as test ends, the ends A2 and B2 of the other phases are short-circuited by using a short-circuit switch 4, direct current sources are applied to the ends A1 and B1, and interphase voltage U of B, C is measuredBCAnd A, B interphase voltage UABThe total length of the track of the railway is L0，
Position L of short-circuit pointShort length(starting from point C1):
Lshort length＝Lo×(2UBC/UAB)
The system is suitable for accurate positioning of grounding and interphase short-circuit faults of a closed friction circuit of a transport chain, the friction circuit rail grounding phase is determined through insulation detection, under the condition that the friction circuit rail is not disassembled, three-phase bus voltage and friction circuit voltage are collected aiming at two conditions of single-phase grounding and interphase short-circuit, a main control unit realizes the functions of three-phase bus insulation monitoring, single-phase grounding point positioning calculation, interphase short-circuit point positioning calculation and the like, and a monitoring unit realizes friction circuit grounding state, friction circuit grounding point positioning and interphase short-circuit point positioning display.
When the system runs in a single-phase grounding mode of a motorcycle track, abnormality can be found in time, early warning is given, planned shutdown maintenance is carried out, and rapid positioning can be achieved under the condition that the track of the motorcycle track is not disassembled; through detection signal acquisition and analysis, the positioning calculation of the inter-phase short circuit grounding point of the circuit is realized, the accurate position of the fault circuit can be displayed in the monitoring unit, the maintenance operation efficiency is effectively improved, and the high-efficiency and reliable operation of the equipment is ensured.
Claims (2)
1. The utility model provides a transportation chain seals orbital ground connection of electric railway and detects positioning system, includes electric railway power supply system's three-phase bus, its characterized in that: the system also comprises a bus voltage acquisition unit, a detection voltage acquisition unit, a main control unit and a monitoring unit;
the bus voltage acquisition unit is used for respectively acquiring phase voltages of the three-phase bus, when single-phase grounding occurs, the voltage of a grounding phase is close to zero, and the voltage of a non-grounding phase is changed from the phase voltages to line voltages;
the detection voltage acquisition unit is used for respectively acquiring the phase-to-phase voltage and the single-phase voltage-to-ground voltage of the friction circuit powered by the three-phase bus, and converting acquired signals into analog quantity signals of 4-20 mA through a transmitter;
the bus voltage acquisition unit and the detection voltage acquisition unit acquire signals and transmit the signals to the main control unit, and the main control unit carries out insulation monitoring, single-phase grounding point positioning calculation and interphase short circuit point positioning calculation on a single phase in a friction circuit according to the signals acquired by the bus voltage acquisition unit and the detection voltage acquisition unit;
the signal transmission of master control unit to the monitoring unit, the monitoring unit is man-machine interaction interface to the voltage signal that real-time display bus voltage acquisition unit and detection voltage acquisition unit gathered, according to the concrete serial number of electric road, the single-phase earth point position and the alternate short circuit point position of electric road of rubbing are directly perceived to be displayed.
2. The grounding detection and positioning system for the closed friction track of the conveying chain according to claim 1, characterized in that: when the main control unit carries out insulation monitoring on a single phase in a friction circuit, whether the voltage of the single phase is close to zero or not is judged, whether the voltage of the other phase is changed from the phase voltage to the line voltage or not is judged, and if yes, the single phase is diagnosed as being grounded; when single-phase grounding detection is carried out, a power switch at the upper stage of the friction track is switched off, a direct current source is applied to the end point of the grounding phase and any ungrounded phase, and the grounding point is positioned at the position LGroundAccording to the calculation of the formula (1),
Lground＝L0×(2UGround/UPhase (C)) (1)
Wherein L is0Is the total length of the electric path, UGroundTo ground phase, UPhase (C)The phase-to-phase voltage is the voltage between the grounding phase and any ungrounded phase;
when interphase short circuit detection is carried out, the upper-level power switch of the triboelectric path is switched off, a direct current source is applied to any short circuit phase and ungrounded phase end point, and the interphase short circuit point is positioned at the L positionShort lengthAccording to the calculation of the formula (2),
Lshort length＝L0×(2UShort length/UIs not) (2)
Wherein, UIs notFor inter-phase voltage of non-short-circuited two phases of the circuit, UShort lengthIs the interphase voltage of two phases of the short circuit of the friction circuit.
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Address after: 3520 Tongji Road, Baoshan District, Shanghai 201900 Patentee after: Baowu equipment Intelligent Technology Co.,Ltd. Country or region after: China Address before: 3520 Tongji Road, Baoshan District, Shanghai 201900 Patentee before: SHANGHAI BAOSTEEL INDUSTRY TECHNOLOGICAL SERVICE Co.,Ltd. Country or region before: China |