CN1949616A - Over-voltage protection technique for generator set of power station - Google Patents
Over-voltage protection technique for generator set of power station Download PDFInfo
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- CN1949616A CN1949616A CN 200610021931 CN200610021931A CN1949616A CN 1949616 A CN1949616 A CN 1949616A CN 200610021931 CN200610021931 CN 200610021931 CN 200610021931 A CN200610021931 A CN 200610021931A CN 1949616 A CN1949616 A CN 1949616A
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Abstract
The invention discloses an overvoltage protection technique of electric generating set in power station, on the condition of connecting transformer and outdoor distribution equipment by cable, installing resistor on neutral wire of the generator; on the condition of connecting the transformer and outdoor distribution equipment by air wire jumper, separately installing arresters on the high voltage and low voltage sides of the transformer, and installing additional capacitor on the output line from the generator to the transformer. And it has strong relativity, simple structure, good protection effect, high cost, high reliability, etc.
Description
Technical field
The present invention relates to a kind of power equipment overcurrent protection technology, in particular for the over-voltage protection technique of plant generator unit.
Background technology
Cable connects under the situation of transformer and outdoor distribution equipment, its power equipment only need prevent to produce internal overvoltage, because be flushed to the wave amplitude and the steepness of the lightning wave on the transformer by cable very little, and connect with aerial jumper under the situation of the transformer of unit and outdoor distribution equipment, must prevent to produce internal overvoltage and thunder and lightning and produce overvoltage.Because when the electric current that surpasses 5A sintering generator magnetic circuit plate gradually during long duration of action repeatedly; destroy the temperature regime of stator bore hole; cause stator insulation to be scrapped; so building-out capacitor electric current in the time of must and sending signal when the startup of generator protection for earthing device; yet the necessity of building-out capacitor electric current is little on all units; can cause system complex like this, cost is too high, and reliability is not high.
Summary of the invention
In order to solve the deficiency that the protection effect is undesirable, circuit arrangement is complicated, cost is too high, reliability is not high of the overcurrent protection device that has the power station generator unit now; a kind of over-voltage protection technique of plant generator unit is provided, effectively prevents the influence of overvoltage generating set.
For solving the problems of the technologies described above; basic ideas of the present invention are; at first find the bearing capacity of the parts that dielectric strength is minimum in the generator system, strengthen overvoltage protection targetedly, thereby the overvoltage protection performance of entire system is got a promotion it according to experimental result.Experimental result shows; the stator of generator; the power transformer low-voltage coil; house transformator; in the critical components such as voltage transformer; permission insulation voltage with generator unit stator is minimum; testing then with the overvoltage of calculating single-phase arcing ground generation is using cable to be connected under the situation of transformer and outdoor distribution equipment; and at the probability that uses aerial jumper to connect the overvoltage allowed band that exceeds generator unit stator under the situation of the transformer of unit and outdoor distribution equipment whether greater than the safety value of setting 0.05, thereby established theoretical foundation and true foundation be provided for the design of the overcurrent protection technology of generator unit.
The technical scheme that the present invention is adopted for its technical problem of solution is using cable to connect under the situation of transformer and outdoor distribution equipment, to insert single-phase electric arc grounding resistor, the other end ground connection of single-phase electric arc grounding resistor on the center line of generator; Under the situation of transformer that uses aerial jumper connection unit and outdoor distribution equipment, insert lightning arrester respectively in hot side of power transformation device and step-down side, the other end ground connection of lightning arrester connects people's additional capacitor at generator, additional capacitor other end ground connection simultaneously to the outlet line of transformer.
Using cable to connect under the situation of transformer and outdoor distribution equipment; a plurality of local faults that produce adopt single-phase electric arc grounding resistors are installed on the center line of generator when preventing unidirectional arcing ground; and measure the safety value 0.05 that the probability that makes the overvoltage that makes single-phase arcing ground produce in this way exceed the overvoltage allowed band of generator unit stator is lower than regulation, satisfy the overcurrent protection requirement of generator unit.Using cable to connect under the situation of transformer and outdoor distribution equipment, for generator stator insulator, overvoltage is safe, only single-phase electric arc grounding resistor need be installed on the center line of generator, its resistance value depends on the size of unit earthing device capacitance, for 15.75 kilovolts unit, resistor should absorb the energy of 10 kJ (kilojoule)s.
Using cable to connect under the situation of transformer and outdoor distribution equipment, by calculating stator insulation for generator, the dangerous property of overvoltage this moment, all not only will consider internal overvoltage, also to consider the overvoltage that thunder and lightning produces, using cable to connect under the situation of transformer and outdoor distribution equipment, connect people's lightning arrester respectively in hot side of power transformation device and step-down side, the other end ground connection of lightning arrester, simultaneously to the outlet line of transformer, insert additional capacitor at generator, additional capacitor other end ground connection.Find to work as the overvoltage that thunder and lightning produces by test, should be equivalent to the electric current that equipment flows through 10 kilo-ampere levels, therefore using cable to connect under the situation of transformer and outdoor distribution equipment, the pressure limiting level of lightning arrester should conform to the electric current of the 10 kilo-ampere utmost points on the power transformation device high voltage limit.
The invention has the advantages that at the superpotential different principles that produce of generator, the technical scheme that is proposed is with strong points, and is simple in structure, protection effect is good, has avoided conventional electric generators over-voltage protection technique system complex, and cost is too high, the shortcoming that reliability is not high.
Description of drawings
Fig. 1 forms structural representation for the generating set overvoltage protection.
Fig. 2 is generator frame internal overvoltage protection structural representation.
Among the figure: 1, generator, 2, circuit breaker, 3, transformer, 4, load, 5, additional capacitor, 6, transformer high-voltage limit lightning arrester, 7, transformer low voltage limit lightning arrester
Embodiment
As shown in Figure 1, generator 1 passes through outlet line, connect transformer 3 high-pressure sides via circuit breaker 2, step-down side connects load, under the situation of transformer that uses aerial jumper connection unit and outdoor distribution equipment, in hot side of power transformation device and step-down side transformer high-voltage limit lightning arrester 6 and transformer low voltage limit lightning arrester 7 are installed respectively, and insert additional capacitor 6 to the hot side outlet line of transformer at generator, additional capacitor 6 other end ground connection, the pressure limiting level of lightning arrester should conform to the electric current of the 10 kilo-ampere utmost points on the power transformation device high voltage limit.
As shown in Figure 2, use cable to connect under the situation of transformer and outdoor distribution equipment, on the center line of generator, insert resistor, the other end ground connection of resistor, the resistance value of the resistor that inserts on the center line of generator depends on the size of unit earthing device capacitance.
Claims (2)
1, the over-voltage protection technique of plant generator unit is characterized in that, using cable to connect under the situation of transformer and outdoor distribution equipment, inserts single-phase electric arc grounding resistor, the other end ground connection of single-phase electric arc grounding resistor on the center line of generator; Under the situation of transformer that uses aerial jumper connection unit and outdoor distribution equipment, insert lightning arrester respectively in hot side of power transformation device and step-down side, the other end ground connection of lightning arrester is inserted additional capacitor at generator, additional capacitor other end ground connection simultaneously to the outlet line of transformer.
2, according to the over-voltage protection technique of the described plant generator unit of claim 1; it is characterized in that; the resistance value of the single-phase electric arc grounding resistor that inserts on the center line of generator depends on the size of unit earthing device capacitance, and its value is 650～6500 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610021931 CN1949616A (en) | 2006-09-25 | 2006-09-25 | Over-voltage protection technique for generator set of power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610021931 CN1949616A (en) | 2006-09-25 | 2006-09-25 | Over-voltage protection technique for generator set of power station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1949616A true CN1949616A (en) | 2007-04-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610021931 Pending CN1949616A (en) | 2006-09-25 | 2006-09-25 | Over-voltage protection technique for generator set of power station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1949616A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108475917A (en) * | 2016-11-25 | 2018-08-31 | 株式会社东芝 | The overvoltage protection of variable-ratio electricity generation system |
-
2006
- 2006-09-25 CN CN 200610021931 patent/CN1949616A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108475917A (en) * | 2016-11-25 | 2018-08-31 | 株式会社东芝 | The overvoltage protection of variable-ratio electricity generation system |
| CN108475917B (en) * | 2016-11-25 | 2019-12-10 | 株式会社东芝 | Overvoltage protection device of variable speed power generation system |
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| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |