CN110336278A - Parallel operation of transformers method based on electric current relay - Google Patents
Parallel operation of transformers method based on electric current relay Download PDFInfo
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- CN110336278A CN110336278A CN201910626154.4A CN201910626154A CN110336278A CN 110336278 A CN110336278 A CN 110336278A CN 201910626154 A CN201910626154 A CN 201910626154A CN 110336278 A CN110336278 A CN 110336278A
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- 238000005286 illumination Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 238000004804 winding Methods 0.000 abstract description 20
- 238000004364 calculation method Methods 0.000 description 2
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- H02J3/005—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P13/00—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output
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Abstract
The embodiment of the present invention discloses the parallel operation of transformers method based on electric current relay, breaker is connected between several segments bus, it is connected with a transformer between high voltage power supply bus and each section of bus, meets that voltage rating is equal, no-load voltage ratio is approximately uniform, voltage ratio is identical, short-circuit impedance per unit value is approximately equal approximately uniform with short-circuit impedance angle between several transformers simultaneously；Error is no more than ± 0.5% between several transformer voltage ratios；Several Transformer Short Circuit Impedance per unit values and short-circuit impedance angle error are no more than ± 10%.When the first transformer current is more than the 5% of setting value, normally opened turn of circuit breaker Q F2 normally closed second transformer energization puts into operation, and when the first transformer current drops to setting value, circuit breaker Q F2 resets, and the second transformer is out of service.This invention ensures that not having circulation when no-load transformer in winding, guarantees that sharing of load is directly proportional to capacity, improve power supply reliability, reduce spare capacity, improve operational efficiency.
Description
Technical field
The present embodiments relate to power supply technique fields, and in particular to a kind of transformer based on electric current relay is transported side by side
Row method.
Background technique
Currently, parallel operation of transformers is the bus that the first winding of two or more transformers is connected in parallel on to same voltage
On, secondary winding is connected in parallel on the bus of another voltage and runs.When a transformer breaks down, other changes of paired running
Depressor can still continue to run, to guarantee the electricity consumption of responsible consumer；Or it can be first in parallel spare when transformer needs to overhaul
Transformer, then the transformer interruption maintenance that will be overhauled, not only can guarantee the scheduled overhaul of transformer, but also can guarantee cut-off in not
Electricity improves the reliability of power supply.Further, since power load seasonality is very strong, it can be by part transformation in load light season
Device is out of service, can both reduce the no-load loss of transformer, improve efficiency, and can reduce idle exciting current, improves electricity
The power factor of net improves the economy of system.
Transformers connected in parallel in prior art, when unloaded, there are circulation between each Circuit Fault on Secondary Transformer in parallel；It is negative
When load, each transformer in parallel can not reasonable load sharing by measure, each Circuit Fault on Secondary Transformer electric current in parallel there are phase difference,
Cause Operation of Electric Systems power supply reliability poor, there are extra spare capacity, transformer station high-voltage side bus low efficiencys.
Summary of the invention
For this purpose, the embodiment of the present invention provides a kind of parallel operation of transformers method based on electric current relay, change ensure that
Circulation is not had when depressor zero load in winding, guarantees that sharing of load is directly proportional to capacity, improves power supply reliability, reduce spare appearance
Amount improves operational efficiency.
To achieve the goals above, the embodiment of the present invention provides the following technical solutions: the transformer based on electric current relay
Paired running method, including high voltage power supply bus further include several segments bus, and breaker, institute are connected between several segments bus
It states and is connected with a transformer between high voltage power supply bus and each section of bus, meet simultaneously between several transformers
Voltage rating is equal, no-load voltage ratio is approximately uniform, voltage ratio is identical, short-circuit impedance per unit value is approximately equal and short-circuit impedance angle
It is approximately uniform；
Error is no more than ± 0.5% between several transformer voltage ratios；Several Transformer Short Circuit Impedance per unit values
It is no more than ± 10% with short-circuit impedance angle error.
As the preferred embodiment of the parallel operation of transformers method based on electric current relay, one section of bus and two are included at least
Section bus, is connected with the first transformer between the high voltage power supply bus and one section of bus, the high voltage power supply bus with
The second transformer is connected between two sections of buses, first transformer and the second transformer meet voltage rating phase simultaneously
Deng, no-load voltage ratio is approximately uniform, voltage ratio is identical, short-circuit impedance per unit value is approximately equal approximately uniform with short-circuit impedance angle；
Error is no more than ± 0.5% between first transformer and the no-load voltage ratio of the second transformer；First transformer
It is no more than ± 10% with the short-circuit impedance per unit value of the second transformer, short-circuit impedance angle error.
As the preferred embodiment of the parallel operation of transformers method based on electric current relay, first transformer with it is described
It is connected with circuit breaker Q F1 between one section of bus, is connected with circuit breaker Q F2 between second transformer and two sections of buses,
Circuit breaker Q F3 is connected between one section of bus and two sections of buses；
When first transformer current is more than the 5% of setting value, normally opened turn of circuit breaker Q F2 normally closed second transformer is logical
Electricity puts into operation, and when the first transformer current drops to setting value, circuit breaker Q F2 resets, and the second transformer is out of service.
As the preferred embodiment of the parallel operation of transformers method based on electric current relay, if every section of bus bar configuration has
Dry electric current relay, each electric current relay are connected with load.
As the preferred embodiment of the parallel operation of transformers method based on electric current relay, the approximately uniform transformer of no-load voltage ratio
Parallel running, the payload size that each transformer is shared are inversely proportional with short-circuit impedance per unit value, Transformer Short Circuit Impedance mark
The load that value undertakes greatly is small, and the small load undertaken of Transformer Short Circuit Impedance per unit value is big.
As the preferred embodiment of the parallel operation of transformers method based on electric current relay, short-circuit impedance per unit value is identical
Transformer, load factor is identical and reaches fully loaded simultaneously.
As the preferred embodiment of the parallel operation of transformers method based on electric current relay, when the short circuit resistance of two transformers
Whens anti-per unit value is not equal, the big Transformer Short Circuit Impedance per unit value of capacity is less than the small Transformer Short Circuit Impedance per unit value of capacity.
As the preferred embodiment of the parallel operation of transformers method based on electric current relay, the identical transformation in short-circuit impedance angle
The load current phase of device parallel running, each transformer is identical.
As the preferred embodiment of the parallel operation of transformers method based on electric current relay, the connection set of the transformer
Label includes Yyn0, Yd11, YNd11, YNy0 and Yy0；
Mixing of the other transformer of Yyn0 group in three-phase four-wire system distribution system, supplying electricity to power and illumination is negative
It carries；
The other transformer of Yd11 group is in route of the low pressure higher than 0.4kV；
In the high-tension line that the other transformer of YNd11 group need to be grounded for the neutral point of 110kV or more；
In the system that the other transformer of YNy0 group need to be grounded for primary side；
The other transformer of Yy0 group is used to supply electricity in the route of three-phase line load.
As the preferred embodiment of the parallel operation of transformers method based on electric current relay, the high voltage power supply bus is used
10kv power supply line.
The embodiment of the present invention, which has the advantages that, is connected with a transformation between high voltage power supply bus and each section of bus
Device, meets that voltage rating is equal, no-load voltage ratio is approximately uniform, voltage ratio is identical, short-circuit impedance between several transformers simultaneously
Per unit value is approximately equal approximately uniform with short-circuit impedance angle.Since the wiring group of transformer is identical, the no-load voltage ratio of transformer is approximate
Identical (difference for allowing to have ± 0.5%) does not have circulation in winding when no-load transformer；The short-circuit per unit value of transformer, resistance
Anti- angle is equal (difference for allowing to have ± 10%), guarantees that sharing of load is directly proportional to capacity.This invention ensures that no-load transformer
When winding in do not have circulation, guarantee that sharing of load is directly proportional to capacity, improve power supply reliability, reduce spare capacity, raising
Operational efficiency.
Detailed description of the invention
It, below will be to embodiment party in order to illustrate more clearly of embodiments of the present invention or technical solution in the prior art
Formula or attached drawing needed to be used in the description of the prior art are briefly described.It should be evident that the accompanying drawings in the following description is only
It is merely exemplary, it for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer, which is extended, obtains other implementation attached drawings.
Fig. 1 is the parallel operation of transformers schematic diagram based on electric current relay provided in the embodiment of the present invention.
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book is understood other advantages and efficacy of the present invention easily, it is clear that described embodiment is the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
Those skilled in the art know that it is Power System Analysis and engineering that per unit value, which is one kind of relative unit,
Common numeric indicia method in calculating indicates that the relative value of each physical quantity and parameter, unit are pu (it is also assumed that its is immeasurable
Guiding principle).In power system computation, per unit value is also widely used.Per unit value be for a certain a reference value, it is same to have
Name value, when a reference value selection is different, per unit value is also different.Per unit value=famous value/a reference value, such as in short circuit current meter
In calculation, a reference capacity (Sjz) and reference voltage (Ujz) are selected, parameters in short circuit calculation are converted to and the ginseng
The ratio (ratio relative to datum quantity) of several datum quantities, referred to as per unit value.
Those skilled in the art know that connection set refers between first and second winding line voltage of three-phase transformer
Angle is indicated with clock method.Three-Phase Transformer winding has three kinds of connecting methods such as star-like connection, triangle junction and zigzag connection.
Capitalization A, B, C are commonly used in winding coupling indicates high-voltage winding head end, indicates its end with X, Y, Z；With lowercase a,
B, c indicates low pressure winding head end, and x, y, z indicates its end, indicates neutral point with o.New standard is to star-like, triangle and indentation
It is coupled, high-voltage winding is indicated with symbol Y, D, Z respectively；Centering pressure and low pressure winding are indicated with y, d, z respectively.There is neutral point to draw
It is indicated respectively with YN, ZN and yn, zn when out.Single-circuit transformer have that voltage rating is low in two windings of common portion one symbol
Number a is indicated.Transformer by high pressure, it is middle pressure and low pressure winding be coupled sequence combine be exactly winding joint group.Such as: it is high
Pressure is Y, and low pressure is yn connection, then winding coupling group is Yyn.In addition clock method indicates that high and low pressure side phasor relation is exactly to be coupled
Group.
Those skilled in the art know, the three-phase transformer that Yy is coupled, share Yy0, Yy4, Yy8, Yy6, Yy10,
Six kinds of connection sets of Yy2, marked as even number；The three-phase transformer that Yd is coupled shares Yd1, Yd5, Yd9, Yd7, Yd11, Yd3 six
Kind connection set, marked as odd number.In order to avoid the confusion in manufacture and use, national Specification is to three-phase double winding electric power
Only five kinds of Yyn0, Yd11, YNd11, YNy0 and Yy0 of transformer regulation.
It should be further noted that " approximately uniform " in the present embodiment refers in the error range allowed,
For example no-load voltage ratio is approximately uniform, as long as error is no more than ± 0.5% between transformer voltage ratio.
Referring to Fig. 1, a kind of parallel operation of transformers method based on electric current relay, including one section 1, two section of bus are provided
Bus 2 and high voltage power supply bus 3, the high voltage power supply bus 3 use 10kv power supply line.The high voltage power supply bus 3 with it is described
It is connected with the first transformer 4 between one section of bus 1, is connected with second between the high voltage power supply bus 3 and two sections of buses 2
Transformer 5, first transformer 4 and the second transformer 5 meet that voltage rating is equal, no-load voltage ratio is approximately uniform, joint group simultaneously
Other label is identical, short-circuit impedance per unit value is approximately equal approximately uniform with short-circuit impedance angle；First transformer 4 and second becomes
Error is no more than ± 0.5% between the no-load voltage ratio of depressor 5；The short-circuit impedance mark of first transformer 4 and the second transformer 5
Value, short-circuit impedance angle error are no more than ± 10%.
Specifically, being connected with circuit breaker Q F1, second transformation between first transformer 4 and one section of bus 1
It is connected with circuit breaker Q F2 between device 5 and two sections of buses 2, is connected with open circuit between one section of bus 1 and two sections of buses 2
Device QF3.Every section of bus bar configuration has several electric current relays, and each electric current relay is connected with load.When described
When one transformer, 4 electric current is more than the 5% of setting value, normally opened turn of the circuit breaker Q F2 normally closed energization of second transformer 5 puts into operation, when
When first transformer, 4 electric current drops to setting value, circuit breaker Q F2 resets, and the second transformer 5 is out of service.
Specifically, the approximately uniform transformers connected in parallel operation of no-load voltage ratio, the payload size and short circuit that each transformer is shared
Impedance per unit value is inversely proportional, and the load that Transformer Short Circuit Impedance per unit value undertakes greatly is small, and Transformer Short Circuit Impedance per unit value is small to be held
The load of load is big.The identical transformer of short-circuit impedance per unit value, load factor is identical and reaches fully loaded simultaneously.When two transformers
Short-circuit impedance per unit value it is not equal whens, the big Transformer Short Circuit Impedance per unit value of capacity is less than the small Transformer Short Circuit Impedance of capacity
Per unit value.
Specifically, the identical transformers connected in parallel operation in short-circuit impedance angle, the load current phase of each transformer are identical.It is described
The voltage ratio of transformer can be Yyn0, Yd11, YNd11, YNy0 and Yy0.The other transformer of the Yyn0 group is used
In three-phase four-wire system distribution system, the mixed load of power and illumination is supplied electricity to；The other transformer of Yd11 group is used for
In route of the low pressure higher than 0.4kV；The other transformer of YNd11 group is used for the height that the neutral point of 110kV or more need to be grounded
In crimping road；The other transformer of YNy0 group is used in the system that primary side need to be grounded；The other transformer of the Yy0 group is used
In the route for supplying electricity to three-phase line load.
Specifically, the transformer of investment Operation of Electric Systems it may first have to confirm the correct of transformer wiring group itself
Property.And to the separate symbol of voltage of each separate symbol of side voltage of its transformer and each side of electric system, actually it is correspondingly connected with standard
True property is very crucial, it is necessary to the correctness of the wiring group after verifying transformer access electric system repeatedly.Transformer differential is protected
Shield wiring must comply with the principle of Differential Protection Connection, and flows with system operating voltage and load current progress hexagonal figure, difference, is poor
The test etc. of pressure.It removes a hidden danger as possible, affirmative differential protection is all correct in the inside and outside equal wiring of disk, is to ensure that differential guarantor
The smooth key for putting into and correctly running of shield.Movement accuracy is improved with this, is had to safe and stable operation of power system
Highly important meaning.It improves through the invention and has reached unexpected technical effect.High voltage power supply of the embodiment of the present invention is female
It is connected with a transformer between line 3 and each section of bus 1, meets that voltage rating is equal, no-load voltage ratio between several transformers simultaneously
It is approximately uniform, voltage ratio is identical, short-circuit impedance per unit value is approximately equal approximately uniform with short-circuit impedance angle.Due to transformation
The wiring group of device is identical, and the no-load voltage ratio of transformer is approximately uniform (difference for allowing to have ± 0.5%), when no-load transformer in winding
Do not have circulation；Short-circuit per unit value, the impedance angle of transformer are equal (difference for allowing to have ± 10%), guarantee sharing of load and hold
It measures directly proportional.This invention ensures that not having circulation when no-load transformer in winding, guarantees that sharing of load is directly proportional to capacity, mention
High power supply reliability reduces spare capacity, improves operational efficiency.
Although above having used general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention are fallen within the scope of the claimed invention.
Claims (10)
1. the parallel operation of transformers method based on electric current relay, including high voltage power supply bus, which is characterized in that if further including
Section bus is done, breaker is connected between several segments bus, is connected between the high voltage power supply bus and each section of bus
There is a transformer, meets that voltage rating is equal, no-load voltage ratio is approximately uniform, voltage ratio between several transformers simultaneously
It is identical, short-circuit impedance per unit value is approximately equal approximately uniform with short-circuit impedance angle；
Error is no more than ± 0.5% between several transformer voltage ratios；Several Transformer Short Circuit Impedance per unit values and short
The anti-angle error of roadlock is no more than ± 10%.
2. the parallel operation of transformers method according to claim 1 based on electric current relay, which is characterized in that at least wrap
One section of bus and two sections of buses are included, is connected with the first transformer between the high voltage power supply bus and one section of bus, it is described
The second transformer is connected between high voltage power supply bus and two sections of buses, first transformer and the second transformer are simultaneously
Meet that voltage rating is equal, no-load voltage ratio is approximately uniform, voltage ratio is identical, the approximately equal and short-circuit resistance of short-circuit impedance per unit value
Anti- angle is approximately uniform；
Error is no more than ± 0.5% between first transformer and the no-load voltage ratio of the second transformer；First transformer and
The short-circuit impedance per unit value of two transformers, short-circuit impedance angle error are no more than ± 10%.
3. the parallel operation of transformers method according to claim 2 based on electric current relay, which is characterized in that described
It is connected with circuit breaker Q F1 between one transformer and one section of bus, connects between second transformer and two sections of buses
It is connected to circuit breaker Q F2, is connected with circuit breaker Q F3 between one section of bus and two sections of buses；
When first transformer current is more than the 5% of setting value, normally opened turn of circuit breaker Q F2 normally closed second transformer, which is powered, to be thrown
Enter operation, when the first transformer current drops to setting value, circuit breaker Q F2 resets, and the second transformer is out of service.
4. the parallel operation of transformers method according to claim 1 based on electric current relay, which is characterized in that every section of institute
Stating bus bar configuration has several electric current relays, and each electric current relay is connected with load.
5. the parallel operation of transformers method according to claim 1 based on electric current relay, which is characterized in that no-load voltage ratio is close
It is run like identical transformers connected in parallel, the payload size that each transformer is shared is inversely proportional with short-circuit impedance per unit value, transformation
The load that device short-circuit impedance per unit value undertakes greatly is small, and the small load undertaken of Transformer Short Circuit Impedance per unit value is big.
6. the parallel operation of transformers method according to claim 1 based on electric current relay, which is characterized in that short circuit resistance
The identical transformer of anti-per unit value, load factor is identical and reaches fully loaded simultaneously.
7. the parallel operation of transformers method according to claim 1 based on electric current relay, which is characterized in that when two
Whens the short-circuit impedance per unit value of transformer is not equal, it is short that the big Transformer Short Circuit Impedance per unit value of capacity is less than the small transformer of capacity
The anti-per unit value of roadlock.
8. the parallel operation of transformers method according to claim 1 based on electric current relay, which is characterized in that short circuit resistance
The identical transformers connected in parallel operation in anti-angle, the load current phase of each transformer are identical.
9. the parallel operation of transformers method according to claim 1 based on electric current relay, which is characterized in that the change
The voltage ratio of depressor includes Yyn0, Yd11, YNd11, YNy0 and Yy0；
The other transformer of Yyn0 group is for supplying electricity to the mixed load of power and illumination in three-phase four-wire system distribution system；
The other transformer of Yd11 group is in route of the low pressure higher than 0.4kV；
In the high-tension line that the other transformer of YNd11 group need to be grounded for the neutral point of 110kV or more；
In the system that the other transformer of YNy0 group need to be grounded for primary side；
The other transformer of Yy0 group is used to supply electricity in the route of three-phase line load.
10. the parallel operation of transformers method according to claim 1 based on electric current relay, which is characterized in that described
High voltage power supply bus uses 10kv power supply line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910626154.4A CN110336278A (en) | 2019-07-11 | 2019-07-11 | Parallel operation of transformers method based on electric current relay |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910626154.4A CN110336278A (en) | 2019-07-11 | 2019-07-11 | Parallel operation of transformers method based on electric current relay |
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| CN110336278A true CN110336278A (en) | 2019-10-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116581753A (en) * | 2023-05-29 | 2023-08-11 | 国网江苏省电力有限公司电力科学研究院 | Transformer spare part configuration strategy optimization method, device, medium and equipment |
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Application publication date: 20191015 |