CN204905848U - DC traction substation overload protection device - Google Patents

DC traction substation overload protection device Download PDF

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Publication number
CN204905848U
CN204905848U CN201520601423.9U CN201520601423U CN204905848U CN 204905848 U CN204905848 U CN 204905848U CN 201520601423 U CN201520601423 U CN 201520601423U CN 204905848 U CN204905848 U CN 204905848U
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switch
current
transformer
feeder
voltage
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李群湛
刘炜
杨乃琪
邓琴
刘承志
李亚楠
黄小红
孟军
仇龙刚
罗成
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Southwest Jiaotong University
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Southwest Jiaotong University
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Abstract

The utility model provides a DC traction substation overload protection device belongs to electrified track traffic power supply technical field. It can solve short problem of direct current switch life -span effectively, and has discernment, differentiation permanent fault and transient fault's function. The utility model relates to a current DC traction substation three -phase inlet wire K's alternating current switch QFJ, dc bus B's voltage transformer YH, a direct current feeder K1's a direct current switch QFZ1 and a current transformer LH1, two K2's of direct current feeder two QFZ2 of direct current switch and two LH2 of current transformer, voltage transformer YH's a measuring junction and current transformer LH1, two LH2's of current transformer measuring junction are connected to overload protection device RP's input, and alternating current switch QFJ's a control end and direct current switch QFZ1, two QFZ2's of direct current switch control end are connected to overload protection device RP's output. Mainly used DC traction substation relay protection.

Description

A kind of DC traction substation protective relaying device
Technical field
The utility model belongs to electrified track traffic power supply technique field, particularly relates to the Protection Technology of direct-current traction power supply electric substation and contact line.
Background technology
The function of DC traction substation is that the AC power of utility network is obtained direct current to supply train through rectification, is used for the urban track traffic such as subway, light rail.Usually, DC traction substation comprises two-way independently (middle pressure) three-phase alternating-current supply and two 12 pulse waves arranged side by side (can equivalence become 24 pulse waves) traction rectifier unit, and wherein traction rectifier unit is made up of traction transformer and diode rectifier and annex.DC traction substation confesses direct current to Traction networks.Traction networks is made up of contact line (or conductor rail) and rail.DC traction substation and Traction networks form DC traction power-supply system.DC traction power-supply system is in operation and various fault may occur; wherein the most common and the most dangerous fault is exactly various types of short troubles; the minimum short circuit current that causes of the resistance of general Traction networks is very big; if can not Timeliness coverage and excision short trouble; it is very harmful, take on find and excision fault task be protective relaying device.Therefore protective relaying device be safety of urban transit run indispensable.
It is more complicated that DC switch technology compares alternating-current switch, and manufacture difficulty is larger, and cost is higher, and the life-span is shorter.Usually, alternating-current switch cut-offs the separating brake number of times of separating brake number of times (electrical endurance) much larger than DC switch of rated short circuit current, if alternating-current switch is 50 times, DC switch is 20 times, and alternating-current switch cut-offs the separating brake number of times (electrical endurance) of rated current also much larger than DC switch, if alternating-current switch is 20000 times, DC switch is 3000 times.Therefore, change a useful life shorter DC switch and excise the traditional method of short trouble, Appropriate application life-span longer alternating-current switch is proposed and the method matched with DC switch is very important to excise fault, the method also has identification, distinguishes the New function of permanent fault and instantaneous (impermanent) fault, thus reduce blindness, unnecessary reclosing, extend switch life, reduce equipment electrical impact, greatly improve power supply reliability.
Utility model content
The purpose of this utility model is to provide a kind of DC traction substation protective relaying device, and it can solve DC switch life-span shorter problem effectively, meanwhile, also has identification, distinguishes the function of permanent fault and instantaneous (impermanent) fault.
The purpose of this utility model is achieved through the following technical solutions: a kind of DC traction substation protective relaying device, relates to the alternating-current switch QFJ of DC traction substation three-phase inlet wire K, the voltage transformer YH of DC bus B, DC feeder one K 1dC switch one QFZ 1and current transformer one LH 1, DC feeder two K 2dC switch two QFZ 2and current transformer two LH 2; The input of protective relaying device RP connects measuring junction summation current transformer one LH of voltage transformer YH 1, current transformer two LH 2measuring junction, the output of protective relaying device RP connects control end and DC switch one QFZ of alternating-current switch QFJ 1, DC switch two QFZ 2control end.
Operation principle of the present utility model is:
When DC bus-bar voltage is reduced to a certain degree, as lower than rated voltage 60% time, train quits work (its electric current is 0), thinks that system is short-circuited fault.After short circuit occurs, short dot and near the electric current that measures be fault current, and flow to short dot, therefore short trouble and type thereof can judge according to the flow direction of the height of voltage and electric current; Conveniently, Calibrated current instrument transformer one LH 1dC feeder one K measured 1be greater than 0 and flow into the value of symbol p of the electric current of DC bus B 1=1, and be greater than 0 and flow out the value of symbol p of the electric current of DC bus B 1=-1, equal the value of symbol p of the electric current of 0 1=0, equally, Calibrated current instrument transformer two LH 2dC feeder two K measured 2be greater than 0 and flow into the value of symbol p of the electric current of DC bus B 2=1, and be greater than 0 and flow out the value of symbol p of the electric current of DC bus B 2=-1, equal the value of symbol p of the electric current of 0 2=0.So, at described DC traction substation, DC bus B and DC feeder one K can be judged by the combination of the value of symbol of the height of the voltage of DC bus B and electric current 1, DC feeder two K 2fault type and formulate guard method; that is: when the voltage that the voltage transformer YH of DC bus B measures is lower than set point (as 60% of rated voltage); protective relaying device RP output command makes its direct separating brake to alternating-current switch QFJ control end, and before remembering alternating-current switch QFJ separating brake, the voltage of the DC bus B that voltage transformer YH measures is U q, after alternating-current switch QFJ separating brake, the voltage of the DC bus B that voltage transformer YH measures is U hif, voltage U hhigher than voltage U q, then protective relaying device RP is judged to be instantaneity short trouble, and thinks that fault disappears, and then make it close a floodgate by the control end of alternating-current switch QFJ, System recover normally runs; If voltage U hbe equal to or less than voltage U q, then protective relaying device RP is judged to be permanent short trouble, point three kinds of situations.
If the A. combination { p of now value of symbol 1, p 2}={-1,1}, then protective relaying device RP judges DC feeder one K 1(and contact line) fault, output command is to DC switch one QFZ then 1control end make its separating brake, excision fault DC feeder one K 1(and contact line), then make the alternating-current switch QFJ of separating brake close a floodgate, recover DC feeder two K 2the normal power supply of (and contact line);
If the B. combination { p of now value of symbol 1, p 2}={ 1 ,-1}, then protective relaying device RP judges DC feeder two K 2(and contact line) fault, output command is to DC switch two QFZ then 2control end make its separating brake, excision fault DC feeder two K 2(and contact line), then make the alternating-current switch QFJ of separating brake close a floodgate, recover DC feeder one K 1the normal power supply of (and contact line);
If the C. combination { p of now value of symbol 1, p 2}={ 1,0} or { 0,1} or { 1,1}, then protective relaying device RP judges DC bus B fault, and output command is to DC switch one QFZ then 1with DC switch two QFZ 2control end make its respectively separating brake, the DC bus B of excision fault.
Alternating-current switch QFJ, DC switch one QFZ 1, DC switch two QFZ 2divide-shut brake information also by Real-time Feedback to protective relaying device RP.
Exceed above-mentioned A, B, C tri-kinds of situations, and the voltage U of DC bus B that after alternating-current switch QFJ separating brake, voltage transformer YH measures hstill the voltage U of the DC bus B that voltage transformer YH measures before being equal to or less than alternating-current switch QFJ separating brake q, be then judged to be that contiguous electric substation there occurs permanent short trouble, then by the electric substation of closing on protective relaying device according to upper identical guard method process.
Theory analysis and calculating show: the voltage measured as the voltage transformer YH of DC bus B is lower than set point (as 60% of rated voltage); and after protective relaying device RP makes the alternating-current switch QFJ separating brake of three-phase inlet wire K; because the electrical distance of power supply to short dot increases; the short circuit current of DC side can reduce by 50% to 80%; therefore; more be conducive to DC switch and excise permanent short trouble, reduce its life loss.
In like manner can process multiple line track, two traction rectifier units (traction transformer and diode rectifier) arranged side by side, the DC bus of traction substation of two DC bus and the short trouble of DC feeder and contact line thereof.
In addition, for improving performance further, the longitudinal difference protection that low-voltage can also be adopted to start to the contact line between two adjacent DC traction substations.
Compared with prior art, the beneficial effects of the utility model are:
One, the utility model can distinguish permanent short trouble and instantaneity short trouble not increasing in other special equipment situations, avoid blindness, unnecessary reclosing and the switch life loss caused and reclosing process thereof to the impact of electric equipment, greatly improve system reliability.
Two, the utility model make use of the feature that alternating-current switch electrical endurance is long and DC switch electrical endurance is short better; propose and preferential use alternating-current switch and to match the relay protective plan of the various short trouble of incompatible excision with DC switch, reliable, economic, practical.
Three, the utility model can save direct current service entrance switch, is conducive to the structure simplifying DC traction substation, investment reduction.
Four, the utility model is implemented conveniently, to be both convenient to new line construction, is also convenient to the transformation of old line.
Accompanying drawing explanation
Fig. 1 is traction substation structure and the fault schematic diagram of the utility model embodiment
Fig. 2 is the traction substation protective relaying device syndeton schematic diagram of the utility model embodiment
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model will be further described.
Fig. 1 illustrates, the DC traction substation structure of the utility model embodiment and fault schematic diagram, and in figure, DC traction substation comprises three-phase inlet wire K and alternating-current switch QFJ, traction transformer TT, diode rectifier UT, DC bus B, DC feeder one K 1and DC switch one QFZ 1, DC feeder two K 2and DC switch two QFZ 2; The voltage transformer YH wherein measuring DC bus B voltage is parallel on DC bus B, measures DC feeder one K 1current transformer one LH of electric current 1be arranged on DC switch one QFZ 1in, measure DC feeder two K 2current transformer two LH of electric current 2be arranged on DC switch two QFZ 2in, for clarity, all do not draw in the drawings; In addition, by DC feeder one K 1electric current be designated as I 1, by DC feeder two K 2electric current be designated as I 2; DC feeder two K is depicted in figure 2and contact line short trouble situation, DC feeder one K 1as the same with DC bus B short trouble.
Fig. 2 is the DC traction substation protective relaying device syndeton schematic diagram of the utility model embodiment.In DC traction substation, the input of protective relaying device RP connects measuring junction summation current transformer one LH of voltage transformer YH 1, current transformer two LH 2measuring junction, namely protective relaying device RP obtains the voltage of DC bus B by the measuring junction of voltage transformer YH, by current transformer LH 1measuring junction obtain DC feeder one K 1electric current I 1, by current transformer LH 2measuring junction obtain DC feeder two K 2electric current I 2; The output of protective relaying device RP connects control end and DC switch one QFZ of alternating-current switch QFJ 1, DC switch two QFZ 2control end, perform separating brake and close a floodgate order, meanwhile, alternating-current switch QFJ, DC switch one QFZ 1, DC switch one QFZ 1by its divide-shut brake information feed back to protective relaying device RP.
Contact net system is short-circuited after fault, and short dot and neighbouring voltage thereof reduce greatly, and train quits work (its electric current is 0), and the electric current of short dot and neighbouring branch road thereof is fault current, and flows to short dot; Protective relaying device RP Calibrated current instrument transformer one LH 1dC feeder one K measured 1be greater than 0 and flow into the value of symbol p of the electric current of DC bus B 1=1, and be greater than 0 and flow out the value of symbol p of the electric current of DC bus B 1=-1, equal the value of symbol p of the electric current of 0 1=0, equally, Calibrated current instrument transformer two LH 2dC feeder two K measured 2be greater than 0 and flow into the value of symbol p of the electric current of DC bus B 2=1, and be greater than 0 and flow out the value of symbol p of the electric current of DC bus B 2=-1, equal the value of symbol p of the electric current of 0 2=0; So protective relaying device RP can judge DC bus B and DC feeder one K by the combination of the value of symbol of the height of the voltage of DC bus B and electric current 1, DC feeder two K 2fault type and guard method: when the voltage that the voltage transformer YH of DC bus B measures is lower than set point (as 60% of rated voltage); protective relaying device RP output command makes its direct separating brake to alternating-current switch QFJ control end, and before remembering alternating-current switch QFJ separating brake, the voltage of the DC bus B that voltage transformer YH measures is U q, after alternating-current switch QFJ separating brake, the voltage of the DC bus B that voltage transformer YH measures is U hif, voltage U hhigher than voltage U q, then protective relaying device RP is judged to be instantaneity short trouble, and thinks that fault disappears, and output command makes it close a floodgate to the control end of alternating-current switch QFJ then, and System recover normally runs; If voltage U hbe equal to or less than voltage U q, then protective relaying device RP is judged to be permanent short trouble, point three kinds of situations.
If the A. combination { p of now value of symbol 1, p 2}={-1,1}, then protective relaying device RP judges DC feeder one K 1(and contact line) fault, output command is to DC switch one QFZ then 1control end make its separating brake, excision fault DC feeder one K 1(and contact line), then make the alternating-current switch QFJ of separating brake close a floodgate, recover DC feeder two K 2the normal power supply of (and contact line);
If the B. combination { p of now value of symbol 1, p 2}={ 1 ,-1}, then protective relaying device RP judges DC feeder two K 2(and contact line) fault, output command is to DC switch two QFZ then 2control end make its separating brake, excision fault DC feeder two K 2(and contact line), then make the alternating-current switch QFJ of separating brake close a floodgate, recover DC feeder one K 1the normal power supply of (and contact line);
If the C. combination { p of now value of symbol 1, p 2}={ 1,0} or { 0,1} or { 1,1}, then protective relaying device RP judges DC bus B fault, and output command is to DC switch one QFZ then 1with DC switch two QFZ 2control end make its respectively separating brake, the DC bus B of excision fault.
Alternating-current switch QFJ, DC switch one QFZ 1, DC switch two QFZ 2divide-shut brake information also by Real-time Feedback to protective relaying device RP.
Exceed above-mentioned A, B, C tri-kinds of situations, and the voltage U of DC bus B that after alternating-current switch QFJ separating brake, voltage transformer YH measures hstill the voltage U of the DC bus B that voltage transformer YH measures before being equal to or less than alternating-current switch QFJ separating brake q, be then judged to be that contiguous electric substation there occurs permanent short trouble, then by the electric substation of closing on protective relaying device according to upper identical guard method process.
Theory analysis and calculating show: the voltage measured as the voltage transformer YH of DC bus B is after lower than set point (as 60% of rated voltage), protective relaying device RP makes the alternating-current switch QFJ separating brake of three-phase inlet wire K; because the electrical distance of power supply to short dot increases; the short circuit current of DC side can reduce by 50% to 80%; therefore; more be conducive to DC switch and excise permanent short trouble, reduce its life loss.
In like manner can process multiple line track, two traction rectifier units (traction transformer and diode rectifier) arranged side by side, the DC bus of traction substation of two DC bus and the short trouble of DC feeder and contact line thereof.
In addition, can match, to improve performance further by the longitudinal difference protection that starts of the low-voltage of contact line between DC traction substation adjacent with two.

Claims (1)

1. a DC traction substation protective relaying device, relates to the alternating-current switch QFJ of DC traction substation three-phase inlet wire K, the voltage transformer YH of DC bus B, DC feeder one K 1dC switch one QFZ 1and current transformer one LH 1, DC feeder two K 2dC switch two QFZ 2and current transformer two LH 2; It is characterized in that: the input of protective relaying device RP connects measuring junction summation current transformer one LH of voltage transformer YH 1, current transformer two LH 2measuring junction, the output of protective relaying device RP connects control end and DC switch one QFZ of alternating-current switch QFJ 1, DC switch two QFZ 2control end.
CN201520601423.9U 2015-08-11 2015-08-11 DC traction substation overload protection device Active CN204905848U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520601423.9U CN204905848U (en) 2015-08-11 2015-08-11 DC traction substation overload protection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201520601423.9U CN204905848U (en) 2015-08-11 2015-08-11 DC traction substation overload protection device

Publications (1)

Publication Number Publication Date
CN204905848U true CN204905848U (en) 2015-12-23

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Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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