CN102565612B - Substation bus fault and insulation automatic detecting device - Google Patents
Substation bus fault and insulation automatic detecting device Download PDFInfo
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- CN102565612B CN102565612B CN201110448899.XA CN201110448899A CN102565612B CN 102565612 B CN102565612 B CN 102565612B CN 201110448899 A CN201110448899 A CN 201110448899A CN 102565612 B CN102565612 B CN 102565612B
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Abstract
The invention belongs to the technical field of electric power systems, which particularly relates to a substation bus fault and insulation automatic detecting device, particularly, the device is a power network automation device for rapidly detecting bus or line state and controlling a manual closing device or an automatic reclosing device before power transmission or fault power failure of a substation bus or line with 10 kilovolt and above voltage classes. The substation bus fault and insulation automatic detecting device is formed by connecting an input port circuit of a mainframe single-chip microcomputer plate arranged in a mainframe box with a high-frequency current detecting unit, a high-frequency signal source, a power-frequency current detecting unit, a power-frequency voltage detecting unit and a power-frequency voltage signal source respectively. The device can automatically detect and judge the operating condition of the substation bus or line, make a right conclusion whether power can be transmitted before manual power transmission of power equipment and give a command of allowing closing or automatic reclosing. The device can rapidly restore power supply after fault, reduces electrical equipment damage and economic loss, guarantees the safe operation of a power network and fills domestic gaps in fields of power network relay protection and automation.
Description
Technical field
The invention belongs to the technical field of electric system, relating in particular to a kind of substation bus fault and insulation automatic detecting device, is specifically fast detecting bus or line status control closing by hand or the power network automation equipment of auto recloser before 10 kilovolts and above substation bus bar or circuit power transmission or after fault outage.
Background technology
At present bus or the circuit of 10 kilovolts and above transformer station at home, there is short circuit, breaks or have the dangerous situations such as ground wire in can not be automatic accurate before power transmission judge whether.There is no automatically to detect bus or circuit high-tension apparatus fault and insulation and control the equipment that high-voltage switch gear closes a floodgate.Can only be whether in shape by the definition apparatus of artificial subjectivity.Once occur forgetting dismounting ground wire or have short circuit or the situation of broken string under, because of error in judgement combined floodgate power transmission, cause high voltage electric equipment to damage, system is impacted, and expands power failure range, when serious, can disintegrate the serious accident of electrical network.
Although and in 35 kilovolts and above transformer station, mostly installed busbar protective device, when there is bus-bar fault, after bus protection action tripping operation, bus has a power failure, cannot judge fast fault is transient fault or permanent short trouble.If trial line charging by force, may cause high voltage electric equipment to damage or expansion accident scope, result in greater loss.And artificial judgment fault needs could recover for a long time power transmission.
Summary of the invention
The present invention is directed to above-mentioned problems of the prior art, a kind of substation bus fault and insulation automatic detecting device are provided.Object is to realize automatically detecting and judge substation bus bar or circuit operating mode, and after fault fast recovery of power supply, reduce electrical equipment and damage and reduce economic loss, assurance electric power netting safe running.
The technical scheme that the present invention realizes invention is as follows:
Substation bus fault and insulation automatic detecting device, it comprises main frame, it is characterized in that: the input port circuit of the host SCM plate arranging in mainframe box is connected with high-frequency current detecting unit, high-frequency signal source, power current detecting unit, power-frequency voltage detecting unit and power-frequency voltage signal source respectively; When the output terminal of voltage commutation circuit is normal, access power-frequency voltage detecting unit, the input end of voltage commutation circuit connects voltage transformer secondary side terminal, and the output terminal of voltage commutation circuit is also connected with power-frequency voltage signal source; The interface circuit of host SCM plate is connected with LCD panel and keypad; The switching value circuit of host SCM plate is connected with control locking combined floodgate relay circuit plate, signal and switching value input and output loop respectively; Host SCM plate is also connected with RS485 communication interface loop;
Host SCM plate control voltage commutation circuit, if substation bus bar or circuit have electricity, detects and is shown to network operation voltage by host SCM plate; If substation bus bar or circuit are without electric fault, the output terminal of host SCM plate control voltage commutation circuit disconnects power-frequency voltage detecting unit, and access power-frequency voltage signal source, sends power-frequency voltage test signal to voltage transformer (VT); Host SCM plate receives the signal of power current detecting unit, and whether are failure judgement or state of insulation;
[0006host SCM plate sends high-frequency signal by high-frequency signal source first backward A phase high-frequency transformer B1, B phase high-frequency transformer B2, C phase high-frequency transformer B3 chronologically, and high-frequency signal uploads to A and is coupled capacitor C1 to the high pressure A of transformer station phase bus MXA; High-frequency signal uploads to B and is coupled capacitor C2 to the high pressure B of transformer station phase bus MXB; High-frequency signal uploads to C and is coupled capacitor C3 to the high pressure C of transformer station phase bus MXC; By A phase sleeve pipe HF current transformer LHA2, B phase sleeve pipe HF current transformer LHB2, C phase sleeve pipe HF current transformer LHC2, high-frequency current signal is received to high-frequency signal source again, with host SCM plate, whether received each phase high-frequency signal and judged each phase bus-bar fault classification;
If main frame does not detect high-frequency current signal from high-frequency current detecting unit, prove that bus does not have short circuit and earth fault; Host SCM plate sends power frequency small voltage signal by power-frequency voltage signal source to A phase voltage mutual inductor YHA, B phase voltage mutual inductor YHB, C phase voltage mutual inductor YHC respectively chronologically, then by detecting the size of power current detecting unit three-phase current numerical value, judges the insulation situation of three-phase bus.
The cardinal rule of China's relay protection of power system is:
1) overhead transmission line relay protection band reclosing device, cable line is not with reclosing;
2) bus protection is not with reclosing;
3) tranformer protection is not with reclosing.
The present invention is substation bus fault and insulation automatic detecting device, is for fast detecting bus or line status before 10 kilovolts and above substation bus bar or circuit power transmission or after fault outage and controls closing by hand or the power network automation equipment of auto recloser.Object is automatically to detect and judge substation bus bar or circuit operating mode, before power equipment is prepared manual power transmission, for dispatching of power netwoks or operation personnel provide the present situation of this equipment, provide correct conclusion that can power transmission and send and allow to close a floodgate or the order of automatic reclosing.Fast recovery of power supply after fault, reduces electrical equipment and damages and reduce economic loss, guarantees electric power netting safe running.The present invention has realized fast detecting and has judged that substation bus bar is nominal situation or malfunction, has filled up the blank of domestic electric grid relay protection and automatic field.The enforcement of the technology of the present invention, will have far-reaching social benefit and huge economic benefit.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: the high pressure A of transformer station phase bus MXA, the high pressure B of transformer station phase bus MXB, the high pressure C of transformer station phase bus MXC, the A capacitor C1 that is coupled, the B capacitor C2 that is coupled, the C capacitor C3 that is coupled, A phase high-frequency transformer B1, B phase high-frequency transformer B2, C phase high-frequency transformer B3, the A frequently current transformer LHA1 of plumber that is nested, the B frequently current transformer LHB1 of plumber that is nested, the C frequently current transformer LHC1 of plumber that is nested, A phase sleeve pipe HF current transformer LHA2, B phase sleeve pipe HF current transformer LHB2, C phase sleeve pipe HF current transformer LHC2, A phase voltage mutual inductor YHA, B phase voltage mutual inductor YHB, C phase voltage mutual inductor YHC,
Cabinet 1, host SCM plate 2, high-frequency current detecting unit 3, high-frequency signal source 4, power current detecting unit 5, power-frequency voltage detecting unit 6, power-frequency voltage signal source 7, voltage commutation circuit 8, LCD panel 9, keypad 10, controls locking combined floodgate relay circuit plate 11, signal and switching value input and output loop 12, RS485 communication interface loop 13.
Below in conjunction with the drawings and specific embodiments, the present invention is described in more detail.
Embodiment
The present invention is a kind of substation bus fault and insulation automatic detecting device, and as shown in Figure 1, it is to consist of the following components:
It comprises main frame: in cabinet 1, be provided with host SCM plate 2; High-frequency signal source 4; High-frequency current signal detecting unit; Power-frequency voltage detecting signal unit; Power current detecting signal unit; Liquid crystal display; Interface circuit; Signal and switching value input and output loop; Locking closing circuit.
A be coupled capacitor C1, B be coupled capacitor C2, C be coupled capacitor C3, A phase high-frequency transformer B1, B phase high-frequency transformer B2, C phase high-frequency transformer B3, A phase sleeve pipe HF current transformer LHA2, B phase sleeve pipe HF current transformer LHB2, C phase sleeve pipe HF current transformer LHC2, A frequently current transformer LHA1, B plumber current transformer LHB1, the C plumber current transformer LHC1 frequently that is nested frequently that is nested of plumber that is nested, voltage transformer secondary and tertiary voltage A phase voltage mutual inductor YHA and B phase voltage mutual inductor YHB.
The input port circuit of the mainframe box 1 inner host SCM plate 2 arranging is connected with high-frequency current detecting unit 3, high-frequency signal source 4, power current detecting unit 5 and power-frequency voltage detecting unit 6 respectively; When the output terminal of voltage commutation circuit 8 is normal, access power-frequency voltage detecting unit 6, the input end of voltage commutation circuit 8 connects voltage transformer secondary side terminal, and the output terminal of voltage commutation circuit 8 is also connected with power-frequency voltage signal source 7; The interface circuit of host SCM plate 2 is connected with LCD panel 9 and keypad 10.The switching value circuit of host SCM plate 2 is connected with control locking combined floodgate relay circuit plate 11, signal and switching value input and output loop 12 respectively; Host SCM plate 2 is also connected with RS485 communication interface loop 13.
During concrete enforcement, be coupled one end of capacitor C1 of A is connected with the high pressure A of transformer station phase bus MXA, and be coupled terminal 1 of the other end and A phase high-frequency transformer B1 of capacitor C1 of A is connected; Terminal of A phase high-frequency transformer B1 2 is through A phase sleeve pipe HF current transformer LHA2 interstitial hole ground connection.The secondary line of A phase high-frequency transformer B1 is connected with the high-frequency signal source 4 in mainframe box 1; The secondary line of A phase sleeve pipe HF current transformer LHA2 is connected with the high-frequency current detecting unit 3 in main frame.
Be coupled one end of capacitor C2 of B is connected with the high pressure B of transformer station phase bus MXB, B be coupled capacitor C2 the other end through B be nested plumber frequently current transformer LHB1 interstitial hole be connected with terminal 1 of B phase high-frequency transformer B2; Terminal of B phase high-frequency transformer B2 2 is through B phase sleeve pipe HF current transformer LHB2 interstitial hole ground connection.B be nested plumber frequently the secondary line of current transformer LHB1 be connected with the power current detecting unit 5 in mainframe box 1; The secondary line of B phase high-frequency transformer B2 is connected with the high-frequency signal source 4 in mainframe box 1; The secondary line of B phase sleeve pipe HF current transformer LHB2 is connected with the high-frequency current detecting unit 3 in mainframe box 1.
Be coupled one end of capacitor C3 of C is connected with the high pressure C of transformer station phase bus MXC, C be coupled capacitor C3 the other end through C be nested plumber frequently current transformer LHC1 interstitial hole be connected with terminal 1 of C phase high-frequency transformer B3; Terminal of C phase high-frequency transformer B3 2 is through C phase sleeve pipe HF current transformer LHC2 interstitial hole ground connection.C be nested plumber frequently the secondary line of current transformer LHC1 be connected with the power current detecting unit 5 in mainframe box 1; The secondary line of C phase high-frequency transformer B3 is connected with the high-frequency signal source 4 in main frame; The secondary line of C phase sleeve pipe HF current transformer LHC2 is connected with the high-frequency current detecting unit 3 in main frame.
[0019]one end of the primary line of A phase voltage mutual inductor YHA is connected with the high pressure A of transformer station phase bus MXA, the other end ground connection of the primary line of A phase voltage mutual inductor YHA.The UA secondary voltage line of A phase voltage mutual inductor YHA is connected with the power-frequency voltage detecting unit 6 in mainframe box 1; The UA secondary voltage line of A phase voltage mutual inductor YHA through A be nested plumber frequently current transformer LHA1 interstitial hole be connected with the power current detecting unit 5 in main frame.
[0020]one end of the primary line of B phase voltage mutual inductor YHB is connected with the high pressure B of transformer station phase bus MXB, the other end ground connection of the primary line of B phase voltage mutual inductor YHB.Through B be nested plumber frequently the UB secondary voltage line of current transformer LHB1 interstitial hole B phase voltage mutual inductor YHB be connected with the power-frequency voltage detecting unit 6 in mainframe box 1; B be nested plumber frequently the secondary line of current transformer LHB1 be connected with the power current detecting unit 5 in main frame.
One end of the primary line of C phase voltage mutual inductor YHC is connected with the high pressure C of transformer station phase bus MXC, the other end ground connection of the primary line of C phase voltage mutual inductor YHC.Through C be nested plumber frequently the UC secondary voltage line of current transformer LHC1 interstitial hole C phase voltage mutual inductor YHC be connected with the power-frequency voltage detecting unit 6 in mainframe box 1; The UC secondary voltage line of C phase voltage mutual inductor YHC is connected with the power current detecting unit 5 in mainframe box 1.
A phase voltage mutual inductor YHA, B phase voltage mutual inductor YHB, the 3U0 of C phase voltage mutual inductor YHC---after the series connection of tertiary voltage line, output two ends are connected with the power-frequency voltage detecting unit 6 in mainframe box 1
.
Principle of work of the present invention is as follows:
When the normal charging operation timer of transformer station detects power-frequency voltage by bus and A phase voltage mutual inductor YHA, B phase voltage mutual inductor YHB, C phase voltage mutual inductor YHC and power-frequency voltage detecting unit 6.9 of device liquid crystal display LCD panel show current busbar voltage.
When bus after transformer station's fault loses voltage, device detects bus no-voltage and by switching value circuit controls locking combined floodgate relay circuit plate 11, detects that all high-voltage switch gears that are connected on bus are all in disconnected position simultaneously, first host SCM plate 2 disconnects power-frequency voltage detecting unit 6 and being connected of host SCM plate 2 by voltage commutation circuit 8, and main frame power-frequency voltage signal source 7 is accessed to voltage transformer (VT).
Then host SCM plate 2 sends high-frequency signal by high-frequency signal source 4 first backward A phase high-frequency transformer B1, B phase high-frequency transformer B2, C phase high-frequency transformer B3 chronologically, and high-frequency signal uploads to A and is coupled capacitor C1 to the high pressure A of transformer station phase bus MXA; High-frequency signal uploads to B and is coupled capacitor C2 to the high pressure B of transformer station phase bus MXB; High-frequency signal uploads to C and is coupled capacitor C3 to the high pressure C of transformer station phase bus MXC; By A phase sleeve pipe HF current transformer LHA2, B phase sleeve pipe HF current transformer LHB2, C phase sleeve pipe HF current transformer LHC2, high-frequency current signal is received to high-frequency signal source 4 again, with host SCM plate 2, whether received each phase high-frequency signal and judged each phase bus-bar fault classification.For example: host SCM plate 2 sends high-frequency signal by high-frequency signal source 4 to A phase high-frequency transformer B1, if, high-frequency current detecting unit 3 detects the high-frequency current signal being received by A phase sleeve pipe HF current transformer LHA2, B phase sleeve pipe HF current transformer LHB2, and bus AB phase short circuit grounding fault has occurred in explanation.
If main frame does not detect high-frequency current signal from high-frequency current detecting unit 3, prove that bus does not have short circuit and earth fault.Main frame sends instruction, voltage commutation circuit 8 actions disconnect power-frequency voltage detecting unit 6 loops, connect power-frequency voltage signal source 7, host SCM plate 2 sends power frequency small voltage signal by power-frequency voltage signal source 7 to A phase voltage mutual inductor YHA, B phase voltage mutual inductor YHB, C phase voltage mutual inductor YHC respectively chronologically, then by detecting the size of power current detecting unit 5 three-phase current numerical value, judges the insulation situation of three-phase bus.
If it is normal not detect short circuit or disconnection fault and dielectric level, to the equipment of preparing power transmission, sends and allow the order of closing a floodgate.
Claims (1)
1. substation bus fault and insulation automatic detecting device, it comprises main frame, it is characterized in that: the input port circuit of the host SCM plate (2) arranging in mainframe box (1) is connected with high-frequency current detecting unit (3), high-frequency signal source (4), power current detecting unit (5), power-frequency voltage detecting unit (6) and power-frequency voltage signal source (7) respectively; When the output terminal of voltage commutation circuit (8) is normal, access power-frequency voltage detecting unit (6), the input end of voltage commutation circuit (8) connects voltage transformer secondary side terminal, and the output terminal of voltage commutation circuit (8) is also connected with power-frequency voltage signal source (7); The interface circuit of host SCM plate (2) is connected with LCD panel (9) and keypad (10); The switching value circuit of host SCM plate (2) is connected with control locking combined floodgate relay circuit plate (11), signal and switching value input and output loop (12) respectively; Host SCM plate (2) is also connected with RS485 communication interface loop (13);
Host SCM plate (2) is controlled voltage commutation circuit (8), if substation bus bar or circuit have electricity, by host SCM plate (2), detects and be shown to network operation voltage; If substation bus bar or circuit are without electric fault, the output terminal that host SCM plate (2) is controlled voltage commutation circuit (8) disconnects power-frequency voltage detecting unit (6), and access power-frequency voltage signal source (7), sends power-frequency voltage test signal to voltage transformer (VT); Host SCM plate (2) receives the signal of power current detecting unit (5), and whether are failure judgement or state of insulation;
Host SCM plate (2) sends high-frequency signal by high-frequency signal source (4) first backward A phase high-frequency transformer B1, B phase high-frequency transformer B2, C phase high-frequency transformer B3 chronologically, and high-frequency signal uploads to A and is coupled capacitor C1 to the high pressure A of transformer station phase bus MXA; High-frequency signal uploads to B and is coupled capacitor C2 to the high pressure B of transformer station phase bus MXB; High-frequency signal uploads to C and is coupled capacitor C3 to the high pressure C of transformer station phase bus MXC; By A phase sleeve pipe HF current transformer LHA2, B phase sleeve pipe HF current transformer LHB2, C phase sleeve pipe HF current transformer LHC2, high-frequency current signal is received to high-frequency signal source (4) again, with host SCM plate (2), whether received each phase high-frequency signal and judged each phase bus-bar fault classification;
If main frame does not detect high-frequency current signal from high-frequency current detecting unit (3), prove that bus does not have short circuit and earth fault; Host SCM plate (2) sends power frequency small voltage signal by power-frequency voltage signal source (7) to A phase voltage mutual inductor YHA, B phase voltage mutual inductor YHB, C phase voltage mutual inductor YHC respectively chronologically, then by detecting the size of power current detecting unit (5) three-phase current numerical value, judges the insulation situation of three-phase bus.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110448899.XA CN102565612B (en) | 2011-12-29 | 2011-12-29 | Substation bus fault and insulation automatic detecting device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110448899.XA CN102565612B (en) | 2011-12-29 | 2011-12-29 | Substation bus fault and insulation automatic detecting device |
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| CN102565612A CN102565612A (en) | 2012-07-11 |
| CN102565612B true CN102565612B (en) | 2014-04-30 |
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| CN102928654A (en) * | 2012-11-11 | 2013-02-13 | 大连东方电器制造有限公司 | input voltage detection device of box-type substation |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101261304A (en) * | 2008-04-25 | 2008-09-10 | 山东大学 | Low current grounding system distribution circuit single-phase earth fault automatic position setting method |
| CN101303387A (en) * | 2008-04-09 | 2008-11-12 | 中国石油化工股份有限公司胜利油田分公司临盘采油厂 | Direct current injection type route selecting positioning system and method thereof |
| CN101435845A (en) * | 2008-12-15 | 2009-05-20 | 辽宁省电力有限公司锦州供电公司 | Small grounding current system double-loop wire single-phase ground fault distance measuring method |
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| JP4662316B2 (en) * | 2007-12-27 | 2011-03-30 | 株式会社安川電機 | AC motor winding switching device and winding switching system thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101303387A (en) * | 2008-04-09 | 2008-11-12 | 中国石油化工股份有限公司胜利油田分公司临盘采油厂 | Direct current injection type route selecting positioning system and method thereof |
| CN101261304A (en) * | 2008-04-25 | 2008-09-10 | 山东大学 | Low current grounding system distribution circuit single-phase earth fault automatic position setting method |
| CN101435845A (en) * | 2008-12-15 | 2009-05-20 | 辽宁省电力有限公司锦州供电公司 | Small grounding current system double-loop wire single-phase ground fault distance measuring method |
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