CN103683216A - Busbar differential protection method - Google Patents
Busbar differential protection method Download PDFInfo
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- CN103683216A CN103683216A CN201310603647.9A CN201310603647A CN103683216A CN 103683216 A CN103683216 A CN 103683216A CN 201310603647 A CN201310603647 A CN 201310603647A CN 103683216 A CN103683216 A CN 103683216A
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- incoming line
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Abstract
The invention relates to a busbar differential protection method. The busbar differential protection method is implemented by the aid of a current differential element, a current transformer saturation judgment element, a voltage latching element and a current latching element. The current latching element comprises a power incoming-line current latching element and a power incoming-line current sudden change latching element. The busbar differential protection method has the advantages that owing to stable and reliable currents acquired at power incoming lines and the busbar differential protection latching elements capable of accurately reflecting whether failures occur at the rears of incoming line switches or not, a current condition of insufficient malfunction prevention measures can be modified, and accordingly busbar systems with voltage levels lower than 35kV can be safely and reliably utilized under the busbar differential protection effect.
Description
Technical field
The present invention relates to a kind of differential protection method for bus.
Background technology
Bus current differential protection due to its sensitivity and accurately cog region internal fault become the principal mode of current bus protection; But with applied environments such as one-end substation low-pressure side bus or Auxiliary System in Power Plant buses because outlet is numerous, complicated, the frequent operation of bus protection wiring, easily cause protection misoperation.
Existing some subject matters be: on due to bus, all intervals all will cause wiring complicated electric current and disconnecting link position signalling access protective device, particularly on low-voltage bus bar because outgoing line interval is numerous, and often operation, misoperation causes protecting the probability of misoperation very large; For not misoperation of differential protection in the situation that outlet switch maintenance mistiming seals in protective device by test current, generally need to be disconnecting link position contact or maintenance pressing plate access protective device, and position contact is insecure in low-pressure system, so malfunction is very risky; Because load fluctuation can cause voltage blocking open, so voltage blocking can not prevent the misoperation under some complicated site environment.
Summary of the invention
The object of this invention is to provide a kind of differential protection method for bus, in order to solve original differential protection, can not well avoid misoperation problem.
For achieving the above object, the solution of the present invention comprises:
A differential protection method for bus, comprises the steps:
1) original differential protection condition: current differential protection starting component, the saturated discriminating element of current transformer, voltage blocking element are carried out corresponding judgement;
2) electric current at the electric power incoming line place that protective device utilization gathers, judges whether electric power incoming line electric current surpasses the first setting value I
s1, judge whether electric power incoming line jump-value of current surpasses the second setting value I
s2, when electric power incoming line electric current surpasses the first setting value or electric power incoming line jump-value of current and surpasses the second setting value, current interlock element is open.
3) meet original differential protection condition, and in the situation of above-mentioned current interlock element opening, sending trip signal.
Judge whether electric power incoming line electric current surpasses the first setting value I
s1adopt: I
d>I
s1
Wherein: I
dfor electric power incoming line latching current,
for current each electric power incoming line electric current; I
s1for inlet wire current locking setting value, I
s1the adjust maximum supply current of when escaping all load outlet normal power supplies on bus electric power incoming line.
Judge whether electric power incoming line jump-value of current surpasses the second setting value I
s2adopt: I
d>I
rand △ I
d>I
s2(equation 2)
When this equation is mainly used in little load or no-load running and when busbar short-circuit fault point has transition resistance, open bus differential protecting outlet.
Wherein: I
dfor electric power incoming line latching current,
for current each electric power incoming line current vector; I
rbe the electric power incoming line latching current of 2 weeks wavefront,
for the current vector of electric power incoming line at 2 weeks wavefront; △ I
dfor electric power incoming line Sudden Changing Rate latching current,
i
s2for electric power incoming line Sudden Changing Rate current interlock definite value, I
s2the impulse current of when escaping outlet and the close a floodgate maximum of adjusting.
The present invention is directed to the low-voltage bus bar running environment complexity at power supply terminal, original bus differential protecting is not enough for the measure that prevents misoperation, and invention utilizes reliable and stable electric power incoming line electric current to improve the method that prevents error action of device performance.
Be 35kV and 10kV side bus and the Auxiliary System in Power Plant bus of common 110kV one-end substation as shown in Figure 1, Figure 2, the feature of this class bus is less electric power incoming line and the bus-bar system of a plurality of load outlets.Investigate this class and be provided with the bus-bar system that sharing of load is object, they have common feature to be exactly that electric power incoming line and interconnection are less and load outlet is a lot, thereby the TA of electric power incoming line place rated current is larger, general 2000A～4000A; The TA at electric power incoming line place is chosen as P level instrument transformer as 5P20 or 5P30; The busbar short-circuit fault current of design is generally below 30000A; Therefore generally can saturated (even if there is not the slight saturated protection identification that yet do not affect) in the TA of electric power incoming line place to this class bus-bar system when bus district internal short-circuit fault; so the TA electric current at electric power incoming line place is reliably, can accurately differentiate after inlet wire TA whether have short trouble.The bus district internal short-circuit of this class bus-bar system must cause the TA of electric power incoming line place electric current to increase; Outgoing line interval misoperation, checking experiment electric current seal in that factor all can not cause the electric power incoming line switch TA of place electric current to increase with disconnecting link position is unreliable etc.
So the electric current at electric power incoming line place as the blocking element of differential protection can be effectively when the fault-free Blocking Differential Protection and open differential protection during in fault, and can effectively avoid misoperation, the connecting point position protection misoperation causing such as unreliable.The present invention is on existing protective device basis, adopts current interlock element and the jump-value of current blocking element at electric power incoming line place to prevent misoperation, and improves the reliability of bus differential protecting action and simplify wiring.For many electric power incoming lines bus wiring system of (and comprising mother segmentation, interconnection), as the mode of connection of accompanying drawing 2, the electric current of current interlock element and jump-value of current blocking element is that the vector sum calculating of a plurality of electric power incoming line electric currents obtains.
Accompanying drawing explanation
Fig. 1 is single bus scheme mode;
Fig. 2 is single mother partition mode of connection;
Fig. 3 is the operational flow diagram of electric power incoming line current interlock element in microcomputer protecting device;
Fig. 4 is bus differential protecting logic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
The present invention is usingd existing microcomputer bus differential protecting device as basis; comprise the traditional saturated discriminating element of current differential protection starting component, current transformer, voltage blocking element; the starting method of these elements and setting method and existing voltage blocking current differential protection method are basic identical; the present invention increases current interlock element on traditional current differential protection basis; current interlock element comprises two parts; first is electric power incoming line current interlock element, and second portion is electric power incoming line jump-value of current blocking element.As shown in Figure 4; original bus differential protecting comprises current differential protection starting component, the saturated discriminating element of current transformer, voltage blocking element; on the basis not changing in original differential protection criterion; set up the current interlock element that utilizes electric power incoming line electric current to carry out locking judgement; electric power incoming line current interlock element and electric power incoming line jump-value of current blocking element are carried out adding with original element and carrying out and computing after exclusive disjunction, latch-up protection tripping operation in this way.For the bus wiring system of many electric power incoming lines, the electric current of current interlock element is obtaining with Current calculation of a plurality of electric power incoming line switches.
Utilize the guard method of this bus differential protecting that adds current interlock as follows:
1) original differential protection condition: current differential protection starting component, the saturated discriminating element of current transformer, voltage blocking element are carried out corresponding judgement;
2) electric current at the electric power incoming line place that protective device utilization collects, judges whether electric power incoming line electric current surpasses the first setting value I
s1, judge whether electric power incoming line jump-value of current surpasses the second setting value I
s2, when electric power incoming line electric current surpasses the first setting value or electric power incoming line jump-value of current and surpasses the second setting value, current interlock element is open.
3) meet original differential protection condition, and in the situation of above-mentioned current interlock element open and protection locking, sending trip signal.
Above-mentioned current differential protection starting component, the saturated discriminating element of current transformer, voltage blocking element are carried out corresponding judgement and are referred to respectively: current differential protection starting component is to judge in protection zone, whether all inlet wires have troubles inside the sample space feature with the vector sum that goes out line current; The saturated discriminating element of current transformer is to judge that whether current differential protection starting component has current transformer saturated while starting, and avoids bus differential protecting misoperation; Voltage blocking element is to judge when current differential protection starting component starts whether voltage has fault signature equally to avoid bus differential protecting misoperation.These all belong to original differential protection condition, are not described in detail in this.
Provide a kind of concrete current interlock element below, comprise electric power incoming line current interlock element and electric power incoming line jump-value of current blocking element, as shown in Figure 3, concrete Rule of judgment is as follows for judgement flow process:
(1) open-equation of electric power incoming line current interlock is:
I
d>I
s1(equation 1)
This equation is for open bus differential protecting outlet in typical busbar fault situation.
Wherein: I
dfor electric power incoming line latching current,
for current each electric power incoming line electric current; I
s1for inlet wire current locking setting value, I
s1the adjust maximum supply current of when escaping all load outlet normal power supplies on bus electric power incoming line.
(2) open-equation of electric power incoming line jump-value of current locking:
I
d>I
rand △ I
d>I
s2(equation 2)
When this equation is mainly used in little load or no-load running and when busbar short-circuit fault point has transition resistance, open bus differential protecting outlet.
Wherein: I
dfor electric power incoming line latching current,
for current each electric power incoming line current vector; I
rbe the electric power incoming line latching current of 2 weeks wavefront,
for the current vector of electric power incoming line at 2 weeks wavefront; △ I
dfor electric power incoming line Sudden Changing Rate latching current,
i
s2for electric power incoming line Sudden Changing Rate current interlock definite value, I
s2the impulse current of when escaping outlet and the close a floodgate maximum of adjusting.
When just having dropped into, current interlock element do not carry out the computing of Sudden Changing Rate current interlock element; The computing of current interlock element drops into the computing of Sudden Changing Rate circuit interlocking element after dropping into 2 cycles automatically.
It will be apparent to those skilled in the art that choosing of the conditions such as concrete judgement equation, periodicity can the method according to this invention adjust and not exceed the scope of protection of present invention.
Claims (3)
1. a differential protection method for bus, is characterized in that, comprises the steps:
1) original differential protection condition: current differential protection starting component, the saturated discriminating element of current transformer, voltage blocking element are carried out corresponding judgement;
2) be arranged on the current transformer collection electric current at electric power incoming line place, judge whether each electric power incoming line electric current summation surpasses the first setting value I
s1, judge whether jump-value of current surpasses the second setting value I
s2, when corresponding current surpasses the first setting value or the second setting value, the locking of current interlock element open and protection;
3) meet original differential protection condition, and in the situation of above-mentioned current interlock element open and protection locking, sending trip signal.
2. a kind of differential protection method for bus according to claim 1, is characterized in that, describedly judges that whether each electric power incoming line electric current summation surpasses the first setting value I
s1adopt: I
d>I
s1;
Wherein: I
dfor electric power incoming line latching current,
for current each electric power incoming line electric current; I
s1for inlet wire current locking setting value, I
s1the adjust maximum supply current of when escaping all load outlet normal power supplies on bus electric power incoming line.
3. a kind of differential protection method for bus according to claim 1, is characterized in that, judges whether jump-value of current surpasses the second setting value I
s2adopt: I
d>I
rand △ I
d>I
s2;
When above formula is used for little load or no-load running and when busbar short-circuit fault point has transition resistance, open bus differential protecting outlet; Wherein: I
dfor electric power incoming line latching current,
for current each electric power incoming line current vector; I
rbe the electric power incoming line latching current of 2 weeks wavefront,
for the current vector of electric power incoming line at 2 weeks wavefront; △ I
dfor electric power incoming line Sudden Changing Rate latching current,
i
s2for electric power incoming line Sudden Changing Rate current interlock definite value, I
s2the impulse current of when escaping outlet and the close a floodgate maximum of adjusting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310603647.9A CN103683216B (en) | 2013-11-25 | 2013-11-25 | A kind of differential protection method for bus |
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|---|---|---|---|
| CN201310603647.9A CN103683216B (en) | 2013-11-25 | 2013-11-25 | A kind of differential protection method for bus |
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| CN103683216A true CN103683216A (en) | 2014-03-26 |
| CN103683216B CN103683216B (en) | 2017-03-29 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684823A (en) * | 2016-12-14 | 2017-05-17 | 国网北京市电力公司 | Protection device and method for main wiring of ring-in-ring-out branch transformer |
| CN108199355A (en) * | 2018-02-06 | 2018-06-22 | 国网安徽省电力有限公司 | The method that analysis electric mutual inductor influences system protection with electromagnetic transformer cooperation |
| CN109546630A (en) * | 2018-11-28 | 2019-03-29 | 华电电力科学研究院有限公司 | A kind of 10kV differential protection method for bus based on transformer station process layer networking mode |
| CN112993936A (en) * | 2020-12-14 | 2021-06-18 | 山东鲁圣电气设备有限公司 | Integrated protection method, system, terminal and storage medium for box-type substation |
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| CN101771268A (en) * | 2008-12-29 | 2010-07-07 | 许继电气股份有限公司 | Pilot protection method suitable for T-type wiring transmission line |
| CN101882779A (en) * | 2010-07-21 | 2010-11-10 | 深圳市库马克新技术股份有限公司 | High voltage converter with differential protection |
| CN101958530A (en) * | 2010-10-26 | 2011-01-26 | 湖北白莲河抽水蓄能有限公司 | Main transformer differential protection CT polarity check method of pumped storage power station |
| CN102104246A (en) * | 2011-01-30 | 2011-06-22 | 武汉百叡电力技术有限公司 | Method and device for reducing time limit combination step progression of distribution network relaying protection |
| CN102629755A (en) * | 2012-03-22 | 2012-08-08 | 中国电力科学研究院 | Power transmission line backup protection method based on wide area information |
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2013
- 2013-11-25 CN CN201310603647.9A patent/CN103683216B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101771268A (en) * | 2008-12-29 | 2010-07-07 | 许继电气股份有限公司 | Pilot protection method suitable for T-type wiring transmission line |
| CN101882779A (en) * | 2010-07-21 | 2010-11-10 | 深圳市库马克新技术股份有限公司 | High voltage converter with differential protection |
| CN101958530A (en) * | 2010-10-26 | 2011-01-26 | 湖北白莲河抽水蓄能有限公司 | Main transformer differential protection CT polarity check method of pumped storage power station |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684823A (en) * | 2016-12-14 | 2017-05-17 | 国网北京市电力公司 | Protection device and method for main wiring of ring-in-ring-out branch transformer |
| CN106684823B (en) * | 2016-12-14 | 2019-04-09 | 国网北京市电力公司 | Ring goes out the protection device and method that branch connects transformer main electrical scheme into ring |
| CN108199355A (en) * | 2018-02-06 | 2018-06-22 | 国网安徽省电力有限公司 | The method that analysis electric mutual inductor influences system protection with electromagnetic transformer cooperation |
| CN108199355B (en) * | 2018-02-06 | 2019-04-30 | 国网安徽省电力有限公司 | Analysis electronic mutual inductor and electromagnetic transformer cooperate the method influenced on system protection |
| CN109546630A (en) * | 2018-11-28 | 2019-03-29 | 华电电力科学研究院有限公司 | A kind of 10kV differential protection method for bus based on transformer station process layer networking mode |
| CN112993936A (en) * | 2020-12-14 | 2021-06-18 | 山东鲁圣电气设备有限公司 | Integrated protection method, system, terminal and storage medium for box-type substation |
| CN112993936B (en) * | 2020-12-14 | 2022-08-26 | 山东鲁圣电气设备有限公司 | Integrated protection method, system, terminal and storage medium for box-type substation |
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| CN103683216B (en) | 2017-03-29 |
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