CN201307755Y - Equipment for identifying fault types in multiphase power transmission system and multiphase power transmission system - Google Patents
Equipment for identifying fault types in multiphase power transmission system and multiphase power transmission system Download PDFInfo
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- CN201307755Y CN201307755Y CNU2008201269316U CN200820126931U CN201307755Y CN 201307755 Y CN201307755 Y CN 201307755Y CN U2008201269316 U CNU2008201269316 U CN U2008201269316U CN 200820126931 U CN200820126931 U CN 200820126931U CN 201307755 Y CN201307755 Y CN 201307755Y
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Abstract
The utility model discloses equipment for identifying fault types in a multiphase power transmission system and the multiphase power transmission system, wherein for each phase of at least one phase in the multiphase power transmission system, a power injection unit of the equipment comprises a relay which is provided with a first switch as a normally-open switch and a second switch as a normally-closed switch, and a power supply of which one end is grounded via a resistor, while the other end is connected to a power transmission conductor of corresponding phase via the first switch of the relay and a high voltage resistant switch, wherein the high voltage resistant switch is grounded via the second switch of the relay; the relay is set into a mode that the second switch is cut off and the first switch is closed after multiphase tripping occurs; and the high voltage resistant switch is closed after the multiphase tripping occurs so as to inject the power from the power supply into the multiphase power transmission system.
Description
Technical field
The utility model relates to the high voltage power transmission field, particularly the equipment of identification of defective type and heterogeneous transmission system in heterogeneous transmission system.
Background technology
In the three-phase power transmission system, cause the fault of transmission line tripping operation to have two types, i.e. permanent fault and transient fault.Automatic reclosing is to improve transmission system operation stability and successional effective ways.Yet when fault is permanent fault, the reclosing of transmission line will make transmission system and primary equipment suffer the impact of double fault in the short period of time, thereby the performance of equipment and system stable constituted bigger threat.Therefore, distinguish transmission line transient fault and permanent fault so that prevent that the reclosing under the permanent fault from being very important.
At present, in the research of the adaptive reclose of transmission line, substantially all be based on the electromagnetic coupled of non-fault phase circuit, carry out the identification of fault type with different electric characteristics under the transient fault two states by analyzing permanent fault to the tripping operation circuit.But under the situation of transmission line three-phase tripping operation, three power transmission conductors are not charged, both do not had the coupling that perfects relative fault phase, do not have secondary arc current yet.That is to say that do not exist any electric characteristic amount on the three phase line this moment, thereby cause to carry out fault identification based on himself electric parameters.
In addition, proposed also in the prior art that the characteristic information by an electric arc of analysis of failure carries out fault type recognition under the situation that the three-phase tripping operation takes place, but these class methods are subject to the accuracy of fault electric arc model, and its reliability and sensitivity can't be guaranteed.
In view of said circumstances, inventor of the present utility model has disclosed one piece of paper in 2007 annual meetings of CSEE, wherein discloses a kind of simple and reliable fault identification scheme based on the injection power supply.Particularly, as shown in Figure 1, take place external power source S to be incorporated in the transmission line of transmission system by the ground connection disconnecting link K that closes after the three-phase tripping operation in transmission system, coming the identification circuit fault by the electric current on the measurement transmission line then is transient fault or permanent fault.
Though disclose in above-mentioned paper based on the fault identification scheme of injecting power supply, it does not disclose a kind of practical way external power source safety is incorporated in the transmission system.For example, if power supply is incorporated in the transmission system as shown in Figure 1, then this power supply is probably damaged by the high-tension electricity that leaks via ground connection disconnecting link K once in a while in the transmission system.Therefore, the physical security that how to guarantee the power supply introduced also is to need an importance paying close attention to.
The utility model content
Provided hereinafter about brief overview of the present utility model, so that basic comprehension about some aspect of the present utility model is provided.But, should be appreciated that this general introduction is not about exhaustive general introduction of the present utility model.It is not that intention is used for determining key part of the present utility model or pith, neither be intended to be used for limiting scope of the present utility model.Its purpose only is to provide about some notion of the present utility model with the form of simplifying, with this as the preorder in greater detail that provides after a while.
The purpose of this utility model provide a kind of in heterogeneous transmission system the equipment of identification of defective type, wherein can safely power supply be incorporated in this transmission system.
According to one side of the present utility model, provide a kind of in n phase transmission system the equipment of identification of defective type, wherein n is the integer greater than 1, this equipment comprises: power supply injects the unit, be configured in n phase transmission system to take place electrical power is injected in the n phase transmission system after n trips mutually owing to fault; Current measuring unit is configured to measure the electric current in the n phase transmission system when power supply injects the unit electrical power is injected into n phase transmission system; And fault type judgement unit, being configured to differentiate fault according to the current measurement result of current measuring unit is permanent fault or transient fault, wherein, at least one each phase in mutually for n phase transmission system, power supply injects the unit and comprises: relay, and it has as first switch of normal open switch with as the second switch of normally closed switch; Power supply, the one end is via resistance-grounded system, and its other end is connected to corresponding power transmission conductor mutually via first switch of relay with high pressure resistant switch, wherein high pressure resistant switch is also via the second switch ground connection of relay, wherein said relay is configured to disconnect second switch and closed first switch after generation n trips mutually, and described high pressure resistant switch is configured to after generation n trips mutually closed, thereby will be injected into from the electrical power of power supply in the n phase transmission system.
According on the other hand of the present utility model, provide a kind of heterogeneous transmission system that comprises aforesaid equipment.
According to the technical solution of the utility model, in transmission system, do not take place under the situation of three-phase tripping operation, since first switch of relay be disconnect and its second switch is closed, therefore the high-tension electricity that leaks via high pressure resistant switch once in a while when transmission system is worked can lead to ground via the second switch of relay, and can power supply not caused damage, thereby guaranteed the fail safe of power supply.
Description of drawings
With reference to below in conjunction with the explanation of accompanying drawing, can understand above and other purpose of the present utility model, characteristics and advantage more easily to the utility model embodiment.In the accompanying drawings, technical characterictic or parts identical or correspondence will adopt identical or corresponding Reference numeral to represent.
Fig. 1 shows the single-phase wiring circuit diagram of power supply based on the fault identification scheme of injecting power supply of prior art.
Fig. 2 shows the block diagram of the equipment of identification of defective type in the three-phase power transmission system according to the utility model embodiment.
Fig. 3 shows the single-phase wiring circuit diagram that injects the unit according to the power supply of the utility model embodiment.
Fig. 4 shows the exemplary power wiring circuit diagram at the three-phase in the three-phase power transmission system according to the utility model embodiment.
Fig. 5 shows according to the exemplary circuit state diagram under the phase A-C earth fault of the utility model embodiment.
Embodiment
Embodiment of the present utility model is described with reference to the accompanying drawings.Should be noted that for clarity sake, omitted in the drawing and description and the utility model parts irrelevant, that those of ordinary skills are known and the expression and the description of processing.
To be that example describes embodiment of the present utility model with the three-phase power transmission system below.But apparently, those skilled in the art can easily expand to the utility model n phase transmission system (n is the integer greater than 1) after describing below having read.
Fig. 2 shows the block diagram of the equipment 200 of identification of defective type in the three-phase power transmission system according to the utility model embodiment.As shown in Figure 2, this equipment comprises that power supply injects unit 210, current measuring unit 220 and fault type judgement unit 230.
In this equipment 200, power supply injects unit 210 and is configured to after the three-phase tripping operation takes place owing to fault in the three-phase power transmission system electrical power is injected in the three-phase power transmission system.Current measuring unit 220 is configured to measure the electric current in the three-phase power transmission system when power supply injects unit 210 electrical power is injected into the three-phase power transmission system.It is permanent fault or transient fault that fault type judgement unit 230 is configured to differentiate fault according to the current measurement result of current measuring unit 220.Particularly, when measuring electric current greater than predetermined threshold, it is permanent fault that fault type judgement unit 230 is differentiated fault, and when the measurement electric current was less than or equal to predetermined threshold, it was transient faults that fault type judgement unit 230 is differentiated faults.
Further describe the specific implementation that power supply injects unit 210 below with reference to Fig. 3.Fig. 3 shows the single-phase wiring circuit diagram that injects unit 210 according to the power supply of the utility model embodiment.As shown in Figure 3, at least one each phase in quite in the three-phase power transmission system, power supply injects unit 210 and comprises: relay J, and it has normal open switch J1 and normally closed switch J2; And power supply S, the one end is via resistor R ground connection, and its other end via the switch J1 of relay J and high pressure resistant K switch (here, high pressure resistant switch refers to the high-tension electricity that can tolerate transmission line in the transmission system and the switch that can be directly connected to transmission line, its cost is higher usually) be connected to the power transmission conductor of corresponding phase, wherein high pressure resistant K switch is also via the switch J2 ground connection of relay J.
Preferably, in order to reduce implementation cost, high pressure resistant K switch can adopt existing ground connection disconnecting link in the transmission system.
In transmission system, do not take place under the situation of three-phase tripping operation, since the switch J1 of relay J be disconnect and its switch J2 is closed, therefore the high-tension electricity that leaks via high pressure resistant K switch once in a while when transmission system is worked can lead to ground via the switch J2 of relay J, and can power supply S not caused damage, thereby guaranteed the fail safe of power supply S.In addition, adopt under the situation of existing ground connection disconnecting link in the transmission system in high pressure resistant K switch, because via the switch J2 ground connection of relay J, therefore high pressure resistant K switch still not can be used as the use as usual of ground connection disconnecting link when the three-phase tripping operation took place in transmission system high pressure resistant K switch.
In transmission system because after the tripping operation of fault generation three-phase, preferably, in order to wait pending fault secondary arc to extinguish, in transmission system, take place to have pass by a period of time after the three-phase tripping operation, disconnect the switch J2 of relay J, and the switch J1 of closing relay J and high pressure resistant K switch so that power supply S is connected to the power transmission conductor of transmission system, thereby will be injected in the transmission system from the electrical power of power supply S.
Based on different considerations, power supply S can be AC power or DC power supply.For example, consider that transmission line resistance is very little than its reactance, therefore recommend to adopt DC power supply, and, then should adopt AC power if need carry out accurate fault location.
Fig. 4 shows the exemplary power wiring circuit diagram at the three-phase in the three-phase power transmission system according to the utility model embodiment.In the figure, for the sake of brevity, omitted relevant relay.As example, as shown in Figure 4, phase A and C have inserted power supply Sa and Sc respectively.Preferably, consider feasibility and reliability, power supply Sa can be configured to have identical frequency and different voltage magnitudes with Sc, and for example, the voltage magnitude Ua of power supply Sa is the twice of the voltage magnitude Uc of power supply Sc.Apparently, top wiring configuration only is exemplary, rather than restrictive.Those skilled in the art can easily otherwise carry out power supply wiring, for example, can insert power supply or the like respectively at three-phase.
At power supply S is under the situation of AC power, and the equipment 200 among Fig. 2 can also comprise the failure location unit (not shown), and it is configured to carry out fault location according to power source voltage of being injected and measurement electric current when fault is permanent fault by differentiation.Particularly, failure location unit is according to the power source voltage of being injected and measure electric current and calculate line impedance between power supply decanting point and the fault point, thus accurate fault location point.
Be that example is to how the fault location point is illustrated with the power supply wiring allocation plan of Fig. 4 with A-C earth fault mutually below.In the three-phase power transmission system owing to phase A-C indirectly fault take place after the three-phase tripping operation, K switch a and Kc closure, like this, corresponding circuit state figure as shown in Figure 5.For transient fault, this circuit disconnects, thereby can not survey electric current basically on the line.And for permanent fault, because two power supply Sa and the voltage of Sc and the resistance of resistor R a and Rc presets, and the electric current on power transmission conductor A and the C can record, and therefore can estimate the fault point by following formula:
Wherein, Z
LBe the impedance of the circuit L from the power supply decanting point to the fault point, Ua and Uc are respectively the voltage of power supply Sa and Sc, and Ia and Ic are respectively the power transmission conductor A that records and the electric current on the C, and R is the resistance of resistor R a and Rc.
Correspondingly, for all kinds of heterogeneous fault in the transmission system, corresponding computing formula is as follows:
1. phase A-C earth fault or phase A-C fault
2. phase A-B earth fault or phase A-B fault
3. phase B-C earth fault or phase B-C fault
4. three-phase earth fault or three-phase fault
For this fault, can user's formula (1), (2) or (3) easily calculate fault distance.
As from the foregoing, utilize the technical solution of the utility model, can carry out fault location efficiently and accurately.
Preferred implementation of the present utility model has more than been described.Those of ordinary skill in the art knows that protection range of the present utility model is not limited to detail disclosed herein, and can be encompassed in various variations and equivalents in the spirit scope of the present utility model.
Claims (8)
1. the equipment of an identification of defective type in n phase transmission system, wherein n is the integer greater than 1, this equipment comprises:
Power supply injects the unit, is configured in n phase transmission system to take place owing to fault electrical power is injected in the n phase transmission system after n trips mutually;
Current measuring unit is configured to measure the electric current in the n phase transmission system when power supply injects the unit electrical power is injected into n phase transmission system; And
The fault type judgement unit, being configured to differentiate fault according to the current measurement result of current measuring unit is permanent fault or transient fault,
It is characterized in that at least one each phase in mutually of n phase transmission system, power supply injects the unit and comprises:
Relay, it has as first switch of normal open switch with as the second switch of normally closed switch; And
Power supply, one end be via resistance-grounded system, and its other end is connected to corresponding power transmission conductor mutually via first switch of relay with high pressure resistant switch, and wherein high pressure resistant switch is also via the second switch ground connection of relay,
Its repeat circuit is configured to disconnect second switch and closed first switch after tripping mutually in that n takes place, and described high pressure resistant switch be configured to take place n trip mutually after closure, thereby will be injected into from the electrical power of power supply in the n phase transmission system.
2. equipment as claimed in claim 1 is characterized in that by the high pressure resistant switch of closure power supply being connected to n phase transmission system in that a period of time takes place to have pass by after n trips mutually.
3. equipment as claimed in claim 1 is characterized in that high pressure resistant switch comprises existing ground connection disconnecting link in the n phase transmission system.
4. equipment as claimed in claim 1, it is characterized in that taken place to have pass by after n trips mutually a period of time by disconnecting relay second switch and first switch of closing relay power supply is connected to n phase transmission system.
5. equipment as claimed in claim 1 is characterized in that power supply comprises DC power supply.
6. equipment as claimed in claim 1 is characterized in that power supply comprises AC power.
7. equipment as claimed in claim 6 is characterized in that also comprising failure location unit, and it is configured to when fault is confirmed as permanent fault, carries out fault location based on power source voltage and measurement electric current.
8. a heterogeneous transmission system comprises as each the described equipment in the claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201269316U CN201307755Y (en) | 2008-06-24 | 2008-06-24 | Equipment for identifying fault types in multiphase power transmission system and multiphase power transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201269316U CN201307755Y (en) | 2008-06-24 | 2008-06-24 | Equipment for identifying fault types in multiphase power transmission system and multiphase power transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201307755Y true CN201307755Y (en) | 2009-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201269316U Expired - Lifetime CN201307755Y (en) | 2008-06-24 | 2008-06-24 | Equipment for identifying fault types in multiphase power transmission system and multiphase power transmission system |
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| CN (1) | CN201307755Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111123031A (en) * | 2019-12-18 | 2020-05-08 | 国网湖北省电力有限公司宜昌供电公司 | Fault detection method, low-voltage energy storage pre-operation set device, controller and system |
-
2008
- 2008-06-24 CN CNU2008201269316U patent/CN201307755Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111123031A (en) * | 2019-12-18 | 2020-05-08 | 国网湖北省电力有限公司宜昌供电公司 | Fault detection method, low-voltage energy storage pre-operation set device, controller and system |
| CN111123031B (en) * | 2019-12-18 | 2022-04-29 | 国网湖北省电力有限公司宜昌供电公司 | Fault detection method, low-voltage energy storage pre-operation set device, controller and system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090909 |