CN101846715A - Low-current ground fault line selection device and multi-platform combined line selection method - Google Patents

Low-current ground fault line selection device and multi-platform combined line selection method Download PDF

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Publication number
CN101846715A
CN101846715A CN200910113939A CN200910113939A CN101846715A CN 101846715 A CN101846715 A CN 101846715A CN 200910113939 A CN200910113939 A CN 200910113939A CN 200910113939 A CN200910113939 A CN 200910113939A CN 101846715 A CN101846715 A CN 101846715A
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CN
China
Prior art keywords
circuit
line selection
low
ground fault
current ground
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Pending
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CN200910113939A
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Chinese (zh)
Inventor
刘海峰
曾宇
杨露
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Beihai Yh Tech Jibao Electric Co Ltd
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Beihai Yh Tech Jibao Electric Co Ltd
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Priority to CN200910113939A priority Critical patent/CN101846715A/en
Publication of CN101846715A publication Critical patent/CN101846715A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a low-current ground fault line selection device, which is characterized by comprising a PT/CT circuit, a filter circuit, an operational amplifier circuit, an A/D converting circuit, an FPGA data acquisition circuit, a microprocessor circuit and an output circuit connected with an electric network. The low-current ground fault line selection device breaks through the traditional line selection method, adopts a strong hardware platform and an advanced software algorithm to realize single-phase ground fault line selection of a low-current ground line selection system, and has the advantages of being high in line selection accuracy, being sensitive in reaction to transient fault or intermittent arc grounding, being not influenced by a grounding mode of an electric network system, and the like.

Description

A kind of low-current ground fault line selection device and multi-platform combined line selection method
One. technical field
The present invention relates to the comprehensive automation of electric power system system, particularly a kind of low-current ground fault line selection device and the multi-platform combined line selection method thereof in 35kV and following grade electrical network.
Two. background technology
China 66kV and following low and medium voltage distribution network neutral point generally adopt the non-effective earthing mode, electrical network generation singlephase earth fault does not cause damage to equipment immediately under this mode, can not cause circuit breaker trip, therefore rules allow to continue operation 1~2 hour, but single-phase earthing must manage to find the trouble spot and be eliminated, otherwise, it constitutes a threat to for the safety of electrical equipment, very easily develops into other accidents.
Development of modern industry is more and more higher to electricity consumption reliability and security requirement, and large-scale industrial enterprise such as at present a lot of transformer stations, generating plant, power station and chemical industry, metallurgy, coal, railway all have been equipped with Small Electric Current Earthing And Routing Device.But along with power load increases, circuit outlet number is more and more, and the route selection ability of existing small current earthing wire-selecting product more and more can not meet the demands of production and living, and is mainly reflected in:
1) device selects number of lines to satisfy the demands
Because industrial or agricultural rapid development of economy, power consumption rises rapidly, and the power transmission line way at power transmission and transformation station is also rising year by year, and a lot of little electric current line selection apparatus are still according to early stage line size design, power transmission and transformation station for surpassing certain outlet number just can't meet the demands.
2) the device hardware performance determines that its route selection is limited in one's ability
Though microelectric technique is in very fast development, the processing power of chip is significantly improving, and still, unitary device is when handling the small current earthing wire-selecting data at the more power transmission and transformation station of outlet circuit, its sampling system, data handling system still can't meet the demands, and performance is extremely limited.
3) line selection apparatus can't adapt to the power transmission and transformation changes of operating modes automatically
Single line selection apparatus is when handling the small current earthing wire-selecting data, its account form all designs according to certain method of operation at power transmission and transformation station in advance, when the power transmission and transformation station method of operation changes, must go artificially line selection apparatus is adjusted, make it adapt to the new method of operation, in case some new method of operation has exceeded the route selection ability of device, device can't carry out route selection.
Past for solving because of the device route selection problem of bringing limited in one's ability, often limits outlet and returns number in operation of power transmission and transformation station and upgrading process, simplify the method for operation, this will strengthen the cost of investment at power transmission and transformation station, reduce the dirigibility of operation, influence the power transmission and transformation station and move safely and reliably.
Problems such as the design is in conjunction with the engineering application experience, and is limited in one's ability at the route selection that domestic existing small current earthing wire-selecting product exists, that adaptivity is poor, extendability is bad have proposed many table apparatus associating selection methods.
Three. summary of the invention
The objective of the invention is to design a kind of low-current ground fault line selection device and use many these device associating route selections, to overcome the shortcoming that route selection is limited in one's ability, adaptivity is poor, extendability is bad that separate unit small current earthing wire-selecting product exists.
The objective of the invention is to reach like this: a kind of low-current ground fault line selection device the invention is characterized in: the PT/CT circuit with the voltage transformer (VT) summation current transformer more than a road that joins with electrical network, the filtering circuit that links to each other with voltage transformer (VT) summation current transformer PT/CT circuit and discharge circuit more than one tunnel, the discharge circuit that links to each other with the A/D change-over circuit with filtering circuit more than one tunnel, the A/D change-over circuit that links to each other with the FPGA data acquisition circuit with discharge circuit, the FPGA data acquisition circuit that links to each other with microcontroller circuit with the A/D change-over circuit, with FPGA data acquisition circuit and the microcontroller circuit that links to each other of outlet circuit, the outlet circuit that links to each other with microcontroller circuit, power circuit for each circuit working.
A kind of low-current ground fault line selection device multi-platform combined line selection method, it is characterized in that: adopt Ethernet to connect between many low-current ground fault line selection devices by hub-and-spoke configuration, carry out communication by certain stipulations between the device, by be provided with wherein one as main frame, all the other are as slave, each low-current ground fault line selection device data is gathered voluntarily, the fault initiating element of each low-current ground fault line selection device all picks up from same residual voltage, after breaking down, all devices will start simultaneously, slave sends fault data to main frame by Ethernet, is focused on by main frame.
The main frame route selection software flow of low-current ground fault line selection device multi-platform combined line selection method is: the main frame task resolution is task 1 and task 2, task 1 main responsible analog acquisition and differentiation start, its workflow is: analog acquisition, to whether differentiating fault initiating? be to finish after then entering failure wave-recording; Fault initiating does not then enter the calculating residual voltage, differentiate residual voltage again greater than definite value? be to finish after the fault initiating sign is set; Otherwise finish; The task 2 main selection earth fault lines of being responsible for, is its workflow: whether differentiate fault initiating? otherwise task 2 begins the place and continues the circulation differentiation, be that fault starts then to the slave inquiry whether fault is arranged to main frame, slave have fault then main frame send the transmission request of data to slave, receive from machine data to main frame, search the fault initiating point again, advancing route selection again calculates, message is handled and alarm again, finish behind the clear again fault initiating sign, the slave non-fault then directly enters searches the fault initiating point, advances route selection again and calculates, message is handled and alarm again, finishes behind the clear again fault initiating sign.
The slave route selection software flow of low-current ground fault line selection device multi-platform combined line selection method is: be decomposed into task 1 and task 2, the main frame task resolution is task 1 and task 2, task 1 main responsible analog acquisition and differentiation start, its workflow is: analog acquisition, to whether differentiating fault initiating? be to finish after then entering failure wave-recording; Fault initiating does not then enter the calculating residual voltage, differentiate residual voltage again greater than definite value? be to finish after the fault initiating sign is set; Otherwise finish; The main sampled datas of being responsible for transmitting fault moment of task 2 to main frame, is its workflow: whether differentiate fault initiating? do not get back to task 2 and begin place's continuation circulation differentiation; That fault starts then to enter and receives the host query order? be then to send data to main frame, clear again fault initiating sign finishes again, does not receive the host query order and enters then clearly that the fault initiating sign finishes again.
Described low-current ground fault line selection device is characterized by: described discharge circuit adopts integrated circuit OPA2227U.
Described low-current ground fault line selection device is characterized by: it is 16 that described A/D change-over circuit adopts precision, and sampling rate is 250kSPS (kSPS: analog-digital conversion ic thousand signal per seconds).
Described low-current ground fault line selection device is characterized by: described FPGA data acquisition circuit adopts field programmable gate array IC EPIC3T144C8.
Described low-current ground fault line selection device is characterized by: described microcontroller circuit adopts high performance 32 micro-control units of Motorola, and arithmetic capability surpasses 63MIPS (MIPS: 1,000,000 grades the machine language instruction number that per second is handled).
Described low-current ground fault line selection device is characterized by: described outlet circuit adopts field programmable gate array IC EPM7064SLC84-10.
Take the present invention's effect in the electric system Microcomputer Protection of above measure remarkable, not limited by the outlet circuit, solved unitary device route selection problem limited in one's ability, and variation that can the adaptive system method of operation.Flexible configuration can self application power transmission and transformation changes of operating modes.
The invention will be further described in conjunction with the accompanying drawings and embodiments more below.
Four. description of drawings
Accompanying drawing 1 is the circuit block diagram of the present invention (embodiment);
Accompanying drawing 2 is sampling system part electrical schematic diagrams of the present invention (embodiment);
Accompanying drawing 3 is sampling system part electrical schematic diagrams of the present invention (embodiment);
Accompanying drawing 4 is cpu system part electrical schematic diagrams of the present invention (embodiment);
Accompanying drawing 5 is cpu system part electrical schematic diagrams of the present invention (embodiment);
Accompanying drawing 6 is cpu system part electrical schematic diagrams of the present invention (embodiment);
Accompanying drawing 7 is cpu system part electrical schematic diagrams of the present invention (embodiment);
Accompanying drawing 8 is cpu system part electrical schematic diagrams of the present invention (embodiment);
Accompanying drawing 9 is cpu system part electrical schematic diagrams of the present invention (embodiment);
Accompanying drawing 10 is cpu system part electrical schematic diagrams of the present invention (embodiment);
Accompanying drawing 11 is many low-current ground fault line selection device wiring schematic diagrams of the present invention (embodiment);
Accompanying drawing 12 is data exchange ways figure between principal and subordinate's machine of the present invention (embodiment);
Accompanying drawing 13 is main frame route selection software flow patterns of the present invention (embodiment);
Accompanying drawing 14 is slave route selection software flow patterns of the present invention (embodiment).
Five. embodiment
Accompanying drawing 1 has provided the circuit block diagram of the embodiment of the invention, and the present invention has the PT/CT circuit of the voltage transformer (VT) summation current transformer more than a road that joins with electrical network, the filtering circuit that links to each other with voltage transformer (VT) summation current transformer PT/CT circuit and discharge circuit more than one tunnel, the discharge circuit that links to each other with the A/D change-over circuit with filtering circuit more than one tunnel, the A/D change-over circuit that links to each other with the FPGA data acquisition circuit with discharge circuit, the FPGA data acquisition circuit that links to each other with microcontroller circuit with the A/D change-over circuit, with FPGA data acquisition circuit and the microcontroller circuit that links to each other of outlet circuit, the outlet circuit that links to each other with microcontroller circuit.
Accompanying drawing 2~3 has provided the sampling system part electrical schematic diagram of this bright embodiment.Accompanying drawing 4~10 has provided the cpu system part electrical schematic diagram of the embodiment of the invention.Referring to above accompanying drawing with can finish the manufacturing of hardware of the present invention in conjunction with following material list.
19 inches 4U cabinets of device employing standard, the back of the body is inserted the formula structure.Each plug-in unit strong and weak electricity loop isolates fully, has reduced the coupling of external electromagnetic interference signal in weak-feedback side of transmission line, has strengthened the antijamming capability of device.Device is a core processor with high performance 32 micro-control units of Motorola, is equipped with powerful peripherals, has extremely strong data processing and information storage capability.Inner structure adopts plug-in type, and each plug-in unit designs according to function, mainly comprises: power insert, CPU card, AC sampling plug-in unit, remote control plug-in unit etc.
Table 1PT/CT module material table
Title Specifications and models Quantity
Mutual inductor ??100V/1.2V ??1
Mutual inductor ??5A/1.2V ??11
Table 2 filtering circuit module material table
Title Specifications and models Quantity
Flaky electric capacity ??CC41-0805B103K500NT ??36
Pellet resistance ??R0805-512JT ??24
Table 3 discharge circuit module material table
Title Specifications and models Quantity
Pellet resistance ??R0805-1000JT ??28
Operational amplifier ??OPA2227U ??2
Operational amplifier ??LF347M ??6
Table 4AD modular converter material list
Title Specifications and models Quantity
Integrated circuit ??ADS8364 ??2
Integrated circuit ??LF347M ??8
Sheet tantalum electric capacity ??CA45-35V-2.2uF-B ??1
Sheet tantalum electric capacity ??CA45-16V-47uF-D ??2
Pellet resistance ??R0805-1002FT ??48
Pellet resistance row ??CRN-1608-B4R-103JT ??3
Voltage dependent resistor (VDR) ??FNR-10K-331 ??6
Title Specifications and models Quantity
Safety electric capacity ??CT81-3kV-6800pF ??2
Table 5FPGA data acquisition module material list
Title Specifications and models Quantity
Integrated circuit ?EP1C3T144C8 ??1
Integrated circuit ??AT25040N-10SC-2.7 ??1
Integrated circuit ??EPCS1SI8 ??1
Integrated circuit ??MC74HC08AD ??1
??LDO ??LM1117MPX-ADJ ??1
??LDO ??LT1086CM-3.3 ??1
Integrated circuit ??MC74HC14AD ??1
Integrated circuit ??IDT74ALVC164245PV ??3
Crystal oscillator ??SG-8002CA-PCB-16MHZ ??1
Table 6 microprocessor module material list
Title Specifications and models Quantity
Integrated circuit ??MCF5272VF66 ??1
Integrated circuit ??DS1337S ??1
Integrated circuit ??MAX793TCSE ??1
Integrated circuit ??EPM240T100C5 ??1
Integrated circuit ??HY57V641620HGT-S ??2
Title Specifications and models Quantity
Integrated circuit ??IS62WV25616BLL-55T ??2
Integrated circuit ??AM29LV320DB-90EC ??1
Integrated circuit ??LXT971ALC ??1
Table 7 outlet module material list
Title Specifications and models Quantity
Integrated circuit ??EPM7064SLC84-10 ??1
Integrated circuit ??MC74HC86AD ??1
Integrated circuit ??MC1413BD ??3
Relay ??DK2a-24V ??12
Relay ??DS2Y-S-DC24V ??3
Sheet tantalum electric capacity ??CA45-16V-47uF-D ??2
Single contact pin ??1*2(2.54mm) ??1
Double contact pin ??2*4(2.54mm) ?1
Jumper wire device ??(2S) ?4
The present invention is based on Small Electric Current Earthing And Routing Device and proposed many table apparatus associating selection methods, solved separate unit Small Electric Current Earthing And Routing Device route selection problem limited in one's ability, and variation that can the adaptive system method of operation.It is 44 the tunnel that unitary device has the route selection ability, when the outlet number surpasses 44, needs by increasing Small Electric Current Earthing And Routing Device 1 in actual applications, and the mode that constitutes the associating route selection solves, and the quantity of increase is determined according to actual outlet number.From present China electric system scale, 2~3 table apparatus can meet the demands basically.Therefore, need use device more than 2 or 2 (configuration according to actual needs), Industrial Ethernet switch 3 and some netting twines 2, as shown in figure 11.Adopt 100 m ethernet between device, connect, carry out communication by certain stipulations between the device by hub-and-spoke configuration.By be provided with wherein one all the other are as slave as main frame, each installs data and gathers voluntarily.The fault initiating element of each device all picks up from same residual voltage, and after breaking down, all devices will start simultaneously, and slave sends fault data to main frame by Ethernet, is focused on by main frame.100M Industrial Ethernet switch 3 connect is adopted in communication between the embodiment device that Fig. 1 provides, and can guarantee that average failure-free operation do not interrupt in 50,000 hours, and is stable and reliable for performance; Adopt star-like connected mode, when the unitary device fault withdraws from, do not influence the normal operation of other devices; Network communication speed fully satisfies the requirement of high-speed high capacity exchanges data between device up to 100Mbps.
Accompanying drawing 12 has provided data exchange ways between principal and subordinate's machine of the present invention.Carry out communication according to communication protocol as shown in the figure between principal and subordinate's machine, under the normal operation, main frame regularly sends the question and answer signal to slave, in case break down, slave is replied fault-signal, main frame begins to send out data calling order automatically, and the failure message that slave is gathered is called up, carries out the small current earthing wire-selecting fault distinguishing.
Accompanying drawing 13 has provided the main frame route selection software flow pattern of the embodiment of the invention.The main frame task resolution is task 1 and task 2, and task 1 is main to be responsible for analog acquisition and to differentiate starting, and its workflow is: analog acquisition, to whether differentiating fault initiating? be to finish after then entering failure wave-recording; Fault initiating does not then enter the calculating residual voltage, differentiate residual voltage again greater than definite value? be to finish after the fault initiating sign is set; Otherwise finish; The task 2 main selection earth fault lines of being responsible for, is its workflow: whether differentiate fault initiating? do not get back to task 2 and begin place's continuation circulation differentiation, be that fault starts then to the slave inquiry whether fault is arranged to main frame, slave have fault then main frame send the transmission request of data to slave, receive from machine data to main frame, search the fault initiating point again, advancing route selection again calculates, message is handled and alarm again, finish behind the clear again fault initiating sign, the slave non-fault then directly enters searches the fault initiating point, advances route selection again and calculates, message is handled and alarm again, finishes behind the clear again fault initiating sign.
Accompanying drawing 14 has provided the slave route selection software flow pattern of the embodiment of the invention.Be decomposed into task 1 and task 2, the main frame task resolution is task 1 and task 2, and task 1 is main to be responsible for analog acquisition and to differentiate starting, and its workflow is: analog acquisition, to whether differentiating fault initiating? be to finish after then entering failure wave-recording; Fault initiating does not then enter the calculating residual voltage, differentiate residual voltage again greater than definite value? be to finish after the fault initiating sign is set; Otherwise finish; The main sampled datas of being responsible for transmitting fault moment of task 2 to main frame, is its workflow: whether differentiate fault initiating? do not get back to task 2 and begin place's continuation circulation differentiation; That fault starts then to enter and receives the host query order? be then to send data to main frame, clear again fault initiating sign finishes again, does not receive the host query order and enters then clearly that the fault initiating sign finishes again.

Claims (2)

1. a low-current ground fault line selection device the invention is characterized in: the PT/CT circuit with the voltage transformer (VT) summation current transformer more than a road that joins with electrical network, the filtering circuit that links to each other with voltage transformer (VT) summation current transformer PT/CT circuit and discharge circuit more than one tunnel, the discharge circuit that links to each other with the A/D change-over circuit with filtering circuit more than one tunnel, the A/D change-over circuit that links to each other with the FPGA data acquisition circuit with discharge circuit, the FPGA data acquisition circuit that links to each other with microcontroller circuit with the A/D change-over circuit, with FPGA data acquisition circuit and the microcontroller circuit that links to each other of outlet circuit, the outlet circuit that links to each other with microcontroller circuit, power circuit for each circuit working.
2. the multi-platform combined line selection method of low-current ground fault line selection device according to claim 1, it is characterized in that: adopt Ethernet to connect between many low-current ground fault line selection devices by hub-and-spoke configuration, carry out communication by certain stipulations between the device, by be provided with wherein one as main frame, all the other are as slave, each low-current ground fault line selection device data is gathered voluntarily, the fault initiating element of each low-current ground fault line selection device all picks up from same residual voltage, after breaking down, all devices will start simultaneously, slave sends fault data to main frame by Ethernet, is focused on by main frame.
CN200910113939A 2009-03-27 2009-03-27 Low-current ground fault line selection device and multi-platform combined line selection method Pending CN101846715A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102590697A (en) * 2012-03-16 2012-07-18 武汉朗德电气有限公司 Cable on-line monitoring device for wireless transmission
CN102854421A (en) * 2012-09-11 2013-01-02 江苏旭源科技有限公司 Quick judgment method for low voltage ride through of photovoltaic inverter
CN103412238A (en) * 2013-06-28 2013-11-27 广东电网公司茂名供电局 Self-adaptive small current grounding line selection method
CN106451325A (en) * 2016-11-09 2017-02-22 国网天津市电力公司 Protective circuit for microcomputer type relay protection device
CN107356840A (en) * 2017-07-01 2017-11-17 合肥东玖电气有限公司 One kind is used for earth fault Small Electric Current Earthing And Routing Device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102590697A (en) * 2012-03-16 2012-07-18 武汉朗德电气有限公司 Cable on-line monitoring device for wireless transmission
CN102854421A (en) * 2012-09-11 2013-01-02 江苏旭源科技有限公司 Quick judgment method for low voltage ride through of photovoltaic inverter
CN103412238A (en) * 2013-06-28 2013-11-27 广东电网公司茂名供电局 Self-adaptive small current grounding line selection method
CN106451325A (en) * 2016-11-09 2017-02-22 国网天津市电力公司 Protective circuit for microcomputer type relay protection device
CN107356840A (en) * 2017-07-01 2017-11-17 合肥东玖电气有限公司 One kind is used for earth fault Small Electric Current Earthing And Routing Device

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Application publication date: 20100929