CN102709903A - Method for improving security of high voltage direct current power supply system - Google Patents
Method for improving security of high voltage direct current power supply system Download PDFInfo
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- CN102709903A CN102709903A CN2012101674873A CN201210167487A CN102709903A CN 102709903 A CN102709903 A CN 102709903A CN 2012101674873 A CN2012101674873 A CN 2012101674873A CN 201210167487 A CN201210167487 A CN 201210167487A CN 102709903 A CN102709903 A CN 102709903A
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Abstract
The invention relates to a security structure of a high voltage direct current power supply system, belonging to the information application field. A high voltage combining point is arranged in a multi-way direct current power-supply system; a parallel power supply mechanism is brought in; a transfer passage is provided for fault current; when a partial line breakage event happens in a multi-way high voltage power supply line prior to the combining point, the current on the broken line is transferred to a line at a normal state; the breaking process is finally accomplished under the condition that the current and the voltage at the breakage are both smaller than an arcing threshold value; the condition for generating the electric arc without the high voltage combing point is eliminated; the arcless breakage is realized; electric fire hazards and electrical injury events are prevented from happening; and with the adoption of the security structure, an effective security protection is provided for partial line breakage events prior to the high voltage combining point in the multi-way power supply system. The security structure is mainly applicable for a high voltage direct current power supply system in the information application field.
Description
Technical field the present invention relates to a kind of frame mode of information application HVDC electric power system.
Both at home and abroad to information equipments such as computers, the direct current supply technical development of dc voltage value in the 200--400V scope is very fast at present for background technology, and with respect to traditional 48V communication DC electric power system, this is a kind of high voltage supply technology.China's communications industry standard " the 240V DC power-supply system is used in YD/T 2378--2011 communication " is in formal enforcement on February 1st, 2012; But there is potential safety hazard in the electric power system that the sector standard provides; Promptly in case when circuit disconnected event such as mistake disjunction connector, fuse takes place under line broken circuit fault or the energising situation; Very easily produce direct-current arc, direct-current arc is difficult for extinguishing, and causes electrical fire or electric injury accident easily.Just because of there is such potential safety hazard, limited the large-scale promotion application of HVDC power supply technique at message area.
Summary of the invention task of the present invention provides a kind of framework method of multichannel HVDC electric power system safeguard construction; The multi-channel DC electric power system that makes up by this method is a kind of tolerant system, and the part circuit disconnected event consequence that takes place in the protection zone is limited in the safe range.
A kind of multichannel HVDC electric power system is formed by DC power supply, two-way or multichannel HVDC supply line, isolating diode and DC load tissue more than the two-way; High pressing road point (hereinafter to be referred as closing the road point) is set in the multi-channel DC electric power system, closes road point from this and be DC load power supply, the foundation of closing road point; Introduced parallel operation mechanism; For fault current provides transfering channel, when the multichannel high voltage supply circuit generation part circuit disconnected event of closing before the point of road, the electric current on the open-circuit line is to the normal condition line transitions; The disconnection process is all to accomplish under the situation less than starting the arc threshold values at fracture voltage, electric current, can not produce electric arc; The simple fail safe of considering part circuit disconnection process, the direct short circuit of multichannel homopolarity can form and close the road point, and for taking into account the power supply reliability under the part line short fault, multichannel HVDC supply line forms behind isolating diode respectively and closes the road point; Closing the road point should be near the load end setting, and it is big more the closer to the load protection scope to close the road point, closes the road point and is arranged on load inside and then can realizes whole process protection; When the actual implementation DC power-supply system, close road point multiple-way supply circuit before and should adopt different routes, prevent multichannel disconnection generation simultaneously.
Because the present invention is provided with high pressing road point in the multi-channel DC electric power system; Introduced parallel operation mechanism; For fault current provides transfering channel; The part circuit disconnection process before the point of road of closing is finally to accomplish under all less than the situation of starting the arc threshold values at fracture voltage, electric current, has eliminated the condition that produces electric arc when not having high pressing road point, has realized no arc disconnection; Avoided the generation of electrical fire and electric injury accident, so the present invention provides effective safeguard protection to the part circuit disconnected event before the high pressing road point of multiple-way feed system.
Hereinafter combines accompanying drawing and embodiment that the present invention is further described.
Fig. 1 has the single supply double-circuit DC power-supply system structure principle chart that closes road point.
Fig. 2 is that the single channel one pole breaks off equivalent circuit diagram in Fig. 1 electric power system.
Fig. 3 is the bipolar disconnection equivalent circuit diagram of single channel in Fig. 1 electric power system.
Embodiment Fig. 1 has provided has the structural principle that closes road point single supply double-circuit DC power-supply system.DC power supply E is same load L power supply through circuit 1, circuit 2, and circuit 1, circuit 2 positive poles are put anodal M through forming high pressing road behind isolating diode D1, the D2 respectively, and the double-circuit negative pole closes road point negative pole N through forming behind isolating diode D3, the D4 respectively.The effect of diode is to isolate the single channel short trouble; Short-circuit protection is not discussed among the present invention; For narrating conveniently isolating diode is regarded as short circuit; The direct short circuit of double-circuit homopolarity forms and closes the road point, and isolating diode normally acts on situation but conclusion stands good, and normally acts on situation so the present invention is applicable to isolating diode fully.
If the circuit 1 that closes before the point of road at the A point single channel, one pole disconnected event takes place, specifically divide following two kinds of situation:
(1) conductor breaks off process
Get one section small intercept dA at fracture A two ends, resistance R a that must this intercept by Ohm's law is:
Ra＝ρ×dA÷S
Electricalresistivity, length d A are constant in the following formula, so resistance R a and sectional area S are inversely proportional to.Because intercept dA is enough little, the initial value of resistance R a is very little; The physical process of the stressed disconnection of conductor, be sectional area S by the change procedure of initial value to null value, resistance R a progressively becomes greatly, breaks off moment, sectional area S is zero, and resistance R a be an infinity.
(2) the disconnection process of connector, fuse, switch etc.
Such disconnection process, also be contact resistance by other initial value of milliohm level to infinitely-great change procedure.
This shows that no matter the disconnection process of which kind of character is seen from the resistance angle, can simulate to the series connection variable resistor that infinity changes by very little initial value with one at fracture.If incorporate initial value the line resistance of homologous lines highway section into, then this variable resistor changes to infinitely-great rule by zero.Set up the Resistance model for prediction of disconnection process, we can calculate fracture electric current, the voltage of disconnection process.
Being without loss of generality, is convenience of calculation hereinafter, establishes the resistance that closes road point each line segment of two-way high voltage supply circuit before and is R1, and the resistance of whole single path line segment is R2, and the electric current in the circuit 1 is I1, and the electric current in the circuit 2 is I2, and load current is I.
If the circuit 1 of system before closing road point in anodal A point single channel, one pole disconnected event takes place among Fig. 1, Fig. 2 is an equivalent circuit diagram.Set up following current formula by Fig. 2:
I1×(R1+Ra)＝I2×R1
I1＝I2×R1÷(R1+Ra)
Under the initial condition, Ra=0, I1o=I2o
Information equipment is constant power load basically; In the finite time section of the process of disconnection; Total load current I=I1+I2=2I2o can think unconverted constant; Because it is big that fracture resistance R a progressively becomes in the disconnection process, so I1 progressively diminishes, I2 progressively becomes greatly, the current step on the open-circuit line 1 shifts to the circuit 2 of normal condition; Can think fully on the engineering and break off moment, resistance R a is enough big, and I1 is zero.
Can get thus: disconnection this fracture electric current of moment is less than the striking current threshold values.
Industry standard " the 240V DC power-supply system is used in YD/T 2378--2011 communication " has stipulated that the maximum line drop in road can not can calculate fracture voltage by Fig. 2 greater than 12V completely:
Circuit 1 anodal one pole breaks off, and all load current is transferred to circuit 2 positive poles, and fracture bears and closes the circuit 2 electrode line pressure drops before of road point, and this line pressure is reduced to: I2 * R1=2 * I2o * R1
The single line pressure drop is: I * R2
Double-circuit negative pole state is normal, and circuit 2 pressure drops of getting in the parallel branch are:
0.5I×R1＝I2o×R1
More than three parts constitute road pressure drop completely, then following formula:
2×I2o×R1+I×R2+I2o×R1≤12
3×I2o×R1≤12-I×R2
Fracture voltage=2 * I2o * R1≤9 volt
Calculating can get: this fracture voltage is less than the arcing voltage threshold values.
If single channel, bipolar disconnected event take place the circuit 1 of system before closing road point among Fig. 1, with A, B mark, Fig. 3 is an equivalent circuit diagram to fracture respectively.
The fracture electric current calculates again, and we still can access, and the fracture current step becomes zero, the fracture electric current is less than the result of striking current threshold values.
Circuit 1 bipolar disconnection, bipolar whole load currents are transferred to circuit 2, and fracture bears circuit 2 corresponding line segment pressure drops.Set up following all fronts road drop formula by Fig. 3:
I2×R1+I×R2+I2×R1≤12
Calculating can get fracture voltage=I2 * R1≤6 volt
This fracture voltage is less than the arcing voltage threshold values.
It is thus clear that the single channel one pole that no matter closes before the point of road still be bipolar disconnection process, all be fracture voltage, electric current all less than the situation of starting the arc threshold values under finally completion, can not produce electric arc.
The circuit test has confirmed above conclusion.
Convenient among the present invention for narration, be example with single supply double-circuit DC power-supply system, but conclusion is applicable to any multi-line DC power-supply system that comprises duplicate supply double-circuit system fully, so the present invention is applicable to multi-line DC power-supply system arbitrarily fully.
Claims (5)
1. the framework method of a multichannel HVDC electric power system safeguard construction: form by DC power supply, two-way or the multichannel HVDC supply line more than the two-way and DC load tissue, it is characterized in that:
High pressing road point is set in the multi-channel DC electric power system; The foundation of high pressing road point has been introduced parallel operation mechanism, for fault current provides transfering channel; When the multichannel high voltage supply circuit generation part circuit disconnected event before the high pressing road point; Electric current on the open-circuit line is to the normal condition line transitions, and the disconnection process is all to accomplish under the situation less than starting the arc threshold values at fracture voltage, electric current, can not produce electric arc.
2. multichannel HVDC electric power system according to claim 1 is characterized in that:
High pressing road point is big more the closer to the load protection scope, and high pressing road point should be near the load end setting.
3. multichannel HVDC electric power system according to claim 2 is characterized in that:
High pressing road point is arranged on load inside and can realizes whole process protection.
4. multichannel HVDC electric power system according to claim 3 is characterized in that:
Multiple-way supply circuit before the high pressing road point should adopt different routes, prevents multichannel disconnection generation simultaneously.
5. multichannel HVDC electric power system according to claim 4 is characterized in that:
Multichannel HVDC supply line has formed high pressing road point respectively behind isolating diode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101674873A CN102709903A (en) | 2012-05-28 | 2012-05-28 | Method for improving security of high voltage direct current power supply system |
| CN2012103259413A CN102801153A (en) | 2012-05-28 | 2012-09-06 | Method for improving safety of direct current power supply system |
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| CN2012101674873A CN102709903A (en) | 2012-05-28 | 2012-05-28 | Method for improving security of high voltage direct current power supply system |
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| CN2012101674873A Pending CN102709903A (en) | 2012-05-28 | 2012-05-28 | Method for improving security of high voltage direct current power supply system |
| CN2012103259413A Pending CN102801153A (en) | 2012-05-28 | 2012-09-06 | Method for improving safety of direct current power supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166056A (en) * | 2014-07-17 | 2014-11-26 | 公安部四川消防研究所 | Electrical fire hazard apparatus for direct-current power supply electric line and realization method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201063549Y (en) * | 2007-04-25 | 2008-05-21 | 三垦力达电气(江阴)有限公司 | DC power supply redundant apparatus of high voltage frequency converter |
| CN101753048A (en) * | 2008-12-19 | 2010-06-23 | 方大集团股份有限公司 | Control power supply for subway safety door system |
| CN201726132U (en) * | 2010-07-16 | 2011-01-26 | 许继集团有限公司 | Double-power direct-current power supply system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166056A (en) * | 2014-07-17 | 2014-11-26 | 公安部四川消防研究所 | Electrical fire hazard apparatus for direct-current power supply electric line and realization method thereof |
| CN104166056B (en) * | 2014-07-17 | 2018-12-28 | 公安部四川消防研究所 | A kind of electrical fire risk device of DC power supply electricity consumption route and implementation method |
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