CN103683250A - New type brake resistor fast engaging and removing device - Google Patents
New type brake resistor fast engaging and removing device Download PDFInfo
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- CN103683250A CN103683250A CN201210353509.5A CN201210353509A CN103683250A CN 103683250 A CN103683250 A CN 103683250A CN 201210353509 A CN201210353509 A CN 201210353509A CN 103683250 A CN103683250 A CN 103683250A
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- brake resistor
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- brake resistance
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Abstract
The invention relates to a new type brake resistor fast engaging and removing device, and pertains to the technical field of power electronics. The device can be used in the fast engaging and removing of a brake resistor. In the past, the engaging and removing of the brake resistor is controlled with relay protection so as to be executed by a circuit breaker, the engaging and removing time is several cycles (130-400ms), so the variation of the grid voltage cannot be tracked timely, and the stability effect is not idea. By using the new type brake resistor fast engaging and removing device, the situation can be greatly improved. No mechanical inertia exists on the device, so engaging and removing can be performed fast, and especially in the mechanical oscillation acceleration period, the brake resistor is engaged, and in the deceleration period, the brake resistor is removed, and engaging and removing can be performed repeatedly, and the excessive brake condition will not occur, so the device is a flexible and efficient stabilizing measure, so that the device plays an important role in the safe and stable operation of the grid.
Description
Technical field
The present invention relates to a kind of Novel brake resistance rapid switching device, belong to electric and electronic technical field, can be used for the quick-switching of brake resistance, power network safety operation is played an important role.
Background technology
The load condition of electrical network changes at any time, and the stable of line voltage is the result that generator machinery input power and output of a generator balance each other.In electrical network, be short-circuited, when faulty line is excised in relaying protection then, generator machinery input power has little time reduce and be greater than output of a generator, and generator will be accelerated, and output voltage sharply raises, and line voltage is lost stable.At this moment should add brake resistance, superfluous accelerating power is consumed.In the past, the switching of relay protection and control brake resistance is carried out by circuit breaker, and the switching time is wanted several cycles (130～400ms), can not follow the tracks of in time the variation of line voltage, and stablizing effect is undesirable.
Small hydropower station departs from main electrical network sometimes to power supply (lonely network operation) in the neighbourhood, and the now employing of brake resistance is very important to safe power supply.For example certain factory with power plant for self-supply, often because the tripping operation of large load electric furnace raises suddenly voltage, repeatedly causes the line electricity cable end puncture short that is connected, very large to normal Influence of production.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of Novel brake resistance rapid switching device of switch transformer technique that adopts to address the above problem.Switch transformer technique combines transformer and power electronic device in fact exactly, has formed the electronic power switch module of high pressure resistant, a large electric current, makes it to connect with brake resistance in circuit.
The present invention is achieved by the following technical solutions:
A Novel brake resistance rapid switching device, comprises back-up breaker K1, switch transformer TK, thyristor SCR, isolating switch K2, K3; Isolating switch K2 of upper termination of the former limit of described switch transformer TK winding, the lower termination another isolating switch K3 of the former limit of switch transformer winding; Switch transformer TK pays between the two ends of the every phase simplex winding in limit and is connected to two just antiparallel thyristor SCR; The other end of two isolating switch K2, K3 is connected to respectively two ends of back-up breaker K1.
The control system of described Novel brake resistance rapid switching device adopts programmable controller PLC or industrial computer COM control system, and it and voltage sensor PT form closed-loop control system.
When brake resistance power is larger, can take the method for many auxiliary winding switch transformer to solve, also can take the method for switch transformer module use to solve.
With switch transformer technique, carry out switching brake resistance, situation will be greatly improved.It does not have machinery inertial, can especially can drop into brake resistance in the accelerated period of mechanical oscillation at 10ms with interior quick input excision, in deceleration period excision, also can repeat switching, excessive braking can not occur, and is a kind of flexible and efficient stabilizing measures.
Small hydropower station departs from main electrical network sometimes to power supply (lonely network operation) in the neighbourhood, and the now employing of brake resistance is very important to safe power supply.For example certain factory, often because the tripping operation of large load electric furnace raises suddenly voltage, repeatedly causes the line electricity cable end puncture short that is connected, very large to normal Influence of production, if adopt fast braking resistance surely can effectively be alleviated.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is the main circuit diagram of Novel brake resistance rapid switching device.
Fig. 2 is the Novel brake resistance rapid switching device having adopted by two two winding switch transformer modules are also used, computer control system COM forms.
Embodiment
Adopt the Novel brake resistance rapid switching device system diagram of switch transformer TK technology as shown in Figure 1: comprise back-up breaker K1, switch transformer TK, thyristor SCR, isolating switch K2 and K3; The upper termination isolating switch K2 of the former limit of described switch transformer TK winding, the lower termination isolating switch K3 of the former limit of switch transformer TK winding; Switch transformer TK pays between the two ends of the every phase simplex winding in limit and is connected to two just antiparallel thyristor SCR; The other end of two isolating switch K2, K3 is connected to respectively two ends of back-up breaker K1; Voltage transformer pt is connected to power circuit.
Conventionally isolating switch K2, K3 are in "on" position, standby opening circuit in off-state, when PLC control system detects voltage rising by voltage transformer pt, make immediately the full conducting of device K1 thyristor SCR, switch transformer TK accesses brake resistance in short circuit operating state, and voltage is fallen after rise.When generator makes to make thyristor SCR cut-off after voltage recovery normally through regulating again, switch transformer TK deactivates.
Fig. 2, for when brake resistance power is larger, takes the method for many auxiliary winding switch transformer module use to solve; Here on/off switch is controlled and is adopted industrial computer COM control system, and its control method is same as described above; Power electronic device adopts full control device IGCT.
Just two kinds of embodiments of this invention of foregoing description, do not illustrate essence of an invention Composition of contents is limited, person of an ordinary skill in the technical field, having read modification or the distortion of after specification, aforesaid embodiment being made, does not deviate from essence of an invention and scope.
Claims (3)
1. a Novel brake resistance rapid switching device, comprises back-up breaker (K1), it is characterized in that, also comprises switch transformer (TK), thyristor (SCR), isolating switch (K2, K3); The upper termination isolating switch (K2) of the former limit of described switch transformer (TK) winding, the lower termination isolating switch (K3) of the former limit of switch transformer (TK) winding; Between the two ends of switch transformer (TK) pair every phase simplex winding in limit, be connected to two just antiparallel thyristors (SCR); The other end of two isolating switches (K2, K3) is connected to respectively two ends of back-up breaker (K1).
2. Novel brake resistance rapid switching device according to claim 1, is characterized in that, its control system adopts programmable controller (PLC) or industrial computer (COM) control system, and it and voltage sensor (PT) form closed-loop control system.
3. Novel brake resistance rapid switching device according to claim 1, is characterized in that, when brake resistance power is larger, can take the method for many auxiliary winding switch transformer to solve, and also can take the method for switch transformer module use to solve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210353509.5A CN103683250A (en) | 2012-09-21 | 2012-09-21 | New type brake resistor fast engaging and removing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210353509.5A CN103683250A (en) | 2012-09-21 | 2012-09-21 | New type brake resistor fast engaging and removing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103683250A true CN103683250A (en) | 2014-03-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210353509.5A Pending CN103683250A (en) | 2012-09-21 | 2012-09-21 | New type brake resistor fast engaging and removing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103683250A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85204302U (en) * | 1985-10-04 | 1986-10-08 | 清华大学 | Stable optimum control device by microcomputer in power system |
| CN101403780A (en) * | 2008-11-13 | 2009-04-08 | 中国电力科学研究院 | Laboratory test device and method for dynamic electric voltage recovery device |
| CN201557074U (en) * | 2009-09-01 | 2010-08-18 | 中国石化股份胜利油田分公司技术检测中心 | Oil extractor motor brake device |
| CN201904660U (en) * | 2010-07-23 | 2011-07-20 | 永济新时速电机电器有限责任公司 | Electric driving system applied to heavy truck |
-
2012
- 2012-09-21 CN CN201210353509.5A patent/CN103683250A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85204302U (en) * | 1985-10-04 | 1986-10-08 | 清华大学 | Stable optimum control device by microcomputer in power system |
| CN101403780A (en) * | 2008-11-13 | 2009-04-08 | 中国电力科学研究院 | Laboratory test device and method for dynamic electric voltage recovery device |
| CN201557074U (en) * | 2009-09-01 | 2010-08-18 | 中国石化股份胜利油田分公司技术检测中心 | Oil extractor motor brake device |
| CN201904660U (en) * | 2010-07-23 | 2011-07-20 | 永济新时速电机电器有限责任公司 | Electric driving system applied to heavy truck |
Non-Patent Citations (2)
| Title |
|---|
| 冯卓利等: "开关变压器技术在水轮发电机自同期并列上的应用", 《电气技术》 * |
| 张雪焱等: "可控制动电阻控制器广域协调优化方法研究", 《电工技术学报》 * |
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Application publication date: 20140326 |