CN108565835A - Generator relay protecting method and circuit - Google Patents
Generator relay protecting method and circuit Download PDFInfo
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- CN108565835A CN108565835A CN201810369248.3A CN201810369248A CN108565835A CN 108565835 A CN108565835 A CN 108565835A CN 201810369248 A CN201810369248 A CN 201810369248A CN 108565835 A CN108565835 A CN 108565835A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
- H02H7/062—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors for parallel connected generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Generators And Motors (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
A kind of generator relay protecting method of offer of the embodiment of the present invention and device, are applied in the scene that more generator parallels are run in data center, and the neutral grounding mode of the more generators is through low resistance single-point grounding, and this method includes：Obtain generator neutral point side electric current；And obtain generator outlet side electric current；And according to neutral point side electric current, the action current of outgoing line side electric current and differential current relay, determine whether generator occurs the failure in protection domain.Wherein, neutral point side electric current is the transformed electric current of current transformer through generator neutral point side, and outgoing line side electric current is the transformed electric current of current transformer through generator outlet side.
Description
Technical field
The present embodiments relate to technical field of generators more particularly to a kind of generator relay protecting methods and circuit.
Background technology
Diesel-driven generator is more and more extensive in the use of data center, and the generator system of data center is usually used
More diesel-driven generators and the mode of machine operation, in the case of simultaneously machine operation, the neutral point of diesel-driven generator can be earth-free,
It can also be through low resistance grounding.
Currently, method of the diesel-driven generator through low resistance grounding includes being connect through low resistance multipoint earthing and through low resistance single-point
Ground.Refer to the neutral point of every generator in more generators respectively through low resistance grounding through low resistance multipoint earthing；Through
Low resistance single-point grounding refers to only having a generator through low resistance grounding in more generators, other generators do not connect
Ground.By taking two diesel-driven generators and machine operation as an example, if (a) in Fig. 1 is the schematic diagram through low resistance multipoint earthing, such as Fig. 1
In (b) be the schematic diagram through low resistance single-point grounding.The case where for neutral point through low resistance single-point grounding, diesel-driven generator
Relay protection use overcurrent protection method, specifically, flowing into a certain electric current relay (is properly termed as electric current relay 1, often
Platform generator corresponds to an electric current relay, and 1 corresponding generator of electric current relay is known as generator 1) electric current be generator
The electric current of outgoing line side, when action current of the electric current more than electric current relay 1 for flowing into electric current relay 1, and in default time delay
When arrival, action current of the electric current still above electric current relay 1 of electric current relay 1 is flowed into, electric current relay 1 determines the hair
Motor 1 breaks down, and electric current relay 1, which can trigger, cuts off the generator 1.
However in the above method, due to data center other alternator failures when may also can lead to generator 1
The electric current (the i.e. above-mentioned electric current for flowing into electric current relay 1) of outgoing line side become larger, cause to judge generator 1 by accident and break down, therefore,
According to the electric current of generator outlet side, possibly it can not accurately determine whether generator breaks down.
Invention content
A kind of generator relay protecting method of the application offer and circuit can more quickly and accurately determine generation event
The generator of barrier, and cut off fault generator.
In order to achieve the above objectives, the application adopts the following technical scheme that：
In a first aspect, providing a kind of generator relay protecting method, it is applied to more generator parallel fortune in data center
In capable scene, the neutral grounding mode of the more generators is through low resistance single-point grounding, and this method includes：Obtain power generation
Machine neutral point side electric current；And obtain generator outlet side electric current；And according to neutral point side electric current, outgoing line side electric current and difference
The action current of streaming current relay, determines whether generator occurs the failure in protection domain, wherein neutral point side electric current is
The transformed electric current of current transformer through generator neutral point side, outgoing line side electric current are the Current Mutual Inductance through generator outlet side
The transformed electric current of device.
Generator relay protecting method provided by the present application, due to can according to neutral point side electric current, outgoing line side electric current with
And the action current of differential current relay, determine whether generator occurs the failure in protection domain, for occurring to protect model
The generator of failure in enclosing is cut off, and the generator for the failure in protection domain does not occur, which is reliably failure to actuate, (to be sent out
Motor continues to run), it so, it is possible to accurately determine the generator to break down, and cut off fault generator.
Further, since simultaneously the neutral grounding mode of more generators of machine operation is through low resistance in data center
Single-point grounding, compared with the earthing mode of generator multipoint earthing, using single-point contact earthing mode when, generator occur therefore
Fault current when barrier is smaller, can be reduced to a certain extent to the other equipment or distribution line in generator system
Impact.
In the first optional realization method of first aspect, the action current of above-mentioned differential current relay meets：
Idz＞ Ibpmax, and Idz≥K×IN, wherein IdzFor the action current of differential current relay, IbpmaxFor maximum
Out-of-balance current, K are safety factor, INFor the rated current of generator.
In the application, the action current of differential current relay is more than maximum imbalance current, can be to avoid due to load
Neutral point side current transformer is different from outgoing line side current transformer characteristic when variation or external area error, leads to difference current relay
Device malfunctions, and the action current of differential current relay is more than or equal to K times of rated current, can be to avoid due to two
When the electric current that primary current circuit breaking is formed flows into differential current relay, differential current relay is caused to malfunction.
In second of optional realization method of first aspect, it is above-mentioned according to neutral point side electric current, outgoing line side electric current with
And the action current of differential current relay, determine that the method whether generator occurs the failure in protection domain may include：
According to neutral point side electric current and outgoing line side electric current, the input current of differential current relay is determined；In the side of neutral point side electric current
To with outgoing line side sense of current on the contrary, and differential current relay input current value be more than or equal to difference current
When the value of the action current of relay, determine that the failure in protection domain occurs for generator；Neutral point side sense of current with
Outgoing line side sense of current is identical, and the value of the input current of differential current relay is less than the action of differential current relay
When the value of electric current, determine that the failure in protection domain does not occur for generator.
It is above-mentioned according to neutral point side electric current, the action current of outgoing line side electric current and differential current relay in the application
Generator can be determined either with or without the failure occurred in protection domain, when the failure in protection domain occurs for generator, just meeting
The relay switch for triggering differential current relay is closed, and is cut off the generator to break down to trigger, is not sent out in generator
When giving birth to the failure in protection domain, differential current relay is failure to actuate, which continues normal operation.
In the third optional realization method of first aspect, above-mentioned neutral point side electric current and outgoing line side electric current wrap respectively
Three-phase current is included, every phase current of the three-phase current corresponds to a differential current relay respectively, above-mentioned according to neutral point side electricity
The action current of stream, outgoing line side electric current and differential current relay, determines whether generator occurs the failure in protection domain
Method may include：According to every phase current of every phase current of neutral point side and outgoing line side, the difference current of each is determined
The input current of relay；In neutral point side sense of current and outgoing line side sense of current on the contrary, and with three-phase current pair
It is poor that the value of the input current of at least one of three differential current relays answered differential current relay is more than or equal to
When the value of the action current of streaming current relay, determine that the failure in protection domain occurs for generator；In neutral point side electric current
Direction and outgoing line side sense of current are on the contrary, and the input current of three differential current relays corresponding with three-phase current
When value is respectively less than the value of the action current of differential current relay, determine that the failure in protection domain does not occur for generator.
In the 4th kind of optional realization method of first aspect, the failure packet in protection domain does not occur for above-mentioned generator
Include the failure outside generator normal operation or generator generation protection domain.
In the application, the failure outside protection domain, difference current relay occurs in generator normal operation or generator
The input current of device is respectively less than the action current of the differential current relay, therefore differential current relay does not act, should
Generator continues normal operation.
Second aspect, the application provide a kind of generator relay protection circuit, are applied to more generators in data center
And in the scene of machine operation, the neutral grounding mode of the more generators is to generate electricity for one through low resistance single-point grounding
Machine, the generator relay protection circuit include neutral point side current transformer, outgoing line side current transformer and difference current after
Electric appliance, wherein neutral point side current transformer and outgoing line side current transformer respectively include three-phase windings, the three-phase windings it is every
Phase winding corresponds to a differential current relay, one end of each phase winding of the neutral point side current transformer and power generation respectively
The neutral point side of machine connects, and one end of each phase winding of the outgoing line side current transformer and the outgoing line side of generator connect, should
The other end of the other end of each phase winding of neutral point side current transformer and each phase winding of outgoing line side current transformer
It is respectively connected to the input terminal of corresponding differential current relay.
The neutral point side current transformer, for obtaining neutral point side electric current；The outgoing line side current transformer, for obtaining
Outgoing line side electric current；The differential current relay, for according to neutral point side electric current, outgoing line side electric current and differential current relay
Action current, determine whether generator occurs the failure in protection domain.
Generator relay protection circuit provided by the present application is applied to the more generator parallels operation in data center
In scene, and the neutral grounding mode of more generators is the neutral point side of generator and to go out through low resistance single-point grounding
Line side is respectively connected with current transformer, so as to according to neutral point side electric current, outgoing line side electric current and differential current relay
Action current, determine whether generator occurs the failure in protection domain, compared with overcurrent protection in the prior art, due to
It can determine whether generator is sent out according to neutral point side electric current, the action current of outgoing line side electric current and differential current relay
Failure in raw protection domain, the generator for the failure in protection domain occurs are cut off, for not occurring to protect model
The generator of failure in enclosing reliably is failure to actuate, and so, it is possible to accurately determine the generator to break down, and cuts off failure hair
Motor.
Further, generator relay protection circuit provided by the present application is determining in generator generation protection domain
When failure, the generator of failure, compared with overcurrent protection in the prior art, hair provided by the present application can be cut off no-delayly
Motor relay protection circuit is more sensitive to the failure within the scope of generator protection, can quickly determine the power generation broken down
Machine.
In the first optional realization method of second aspect, the action current of above-mentioned differential current relay meets：
Idz＞ Ibpmax, and Idz≥K×IN, wherein IdzFor the action current of differential current relay, IbpmaxFor maximum
Out-of-balance current, K are safety factor, INFor the rated current of generator.
In second of optional realization method of second aspect, above-mentioned differential current relay is specifically used in
Property point side electric current and outgoing line side electric current, determine the input current of differential current relay；Neutral point side sense of current with go out
Line side sense of current on the contrary, and the input current of differential current relay value be more than or equal to differential current relay
Action current value when, determine generator occur protection domain in failure；In neutral point side sense of current and outgoing line side
Sense of current is identical, and the value of the input current of differential current relay is less than the action current of differential current relay
When value, determine that the failure in protection domain does not occur for generator.
In the third optional realization method of second aspect, the failure packet in protection domain does not occur for above-mentioned generator
Include the failure outside generator normal operation or generator generation protection domain.
Description for the technique effect of the various optional realization methods of second aspect, may refer to for first aspect
Various optional realization methods technique effect description, details are not described herein again.
Description of the drawings
Fig. 1 is that a kind of generator neutral point provided in an embodiment of the present invention is grounded schematic diagram；
Fig. 2 is a kind of generator relay protection circuit schematic diagram one provided in an embodiment of the present invention；
Fig. 3 is a kind of generator relay protection circuit schematic diagram two provided in an embodiment of the present invention；
Fig. 4 is a kind of generator relay protection circuit schematic diagram three provided in an embodiment of the present invention；
Fig. 5 is a kind of generator relay protection circuit schematic diagram four provided in an embodiment of the present invention；
Fig. 6 is a kind of generator relay protection circuit schematic diagram five provided in an embodiment of the present invention；
Fig. 7 is a kind of generator relay protection circuit schematic diagram six provided in an embodiment of the present invention；
Fig. 8 is a kind of generator relay protecting method schematic diagram one provided in an embodiment of the present invention；
Fig. 9 is a kind of generator relay protecting method schematic diagram two provided in an embodiment of the present invention；
Figure 10 is a kind of generator relay protecting method schematic diagram three provided in an embodiment of the present invention；
Figure 11 is a kind of generator relay protecting method schematic diagram four provided in an embodiment of the present invention；
Figure 12 is a kind of generator relay protecting method schematic diagram five provided in an embodiment of the present invention；
Figure 13 is a kind of generator relay protecting method schematic diagram six provided in an embodiment of the present invention；
Figure 14 is a kind of generator relay protecting method schematic diagram seven provided in an embodiment of the present invention.
Specific implementation mode
In embodiments of the present invention, " illustrative " or " such as " etc. words for indicate make example, illustration or explanation.This
Be described as in inventive embodiments " illustrative " or " such as " any embodiment or design scheme be not necessarily to be construed as comparing
Other embodiments or design scheme more preferably or more advantage.Specifically, use " illustrative " or " such as " etc. words purport
Related notion is being presented in specific ways.
In the description of the embodiment of the present invention, unless otherwise indicated, the meaning of " plurality " is refer to two or more.Example
Such as, multiple processing units refer to two or more processing units；Multiple systems refer to two or more systems.
Some concepts involved in generator relay protecting method and circuit provided first inventive embodiments solve
Release explanation.
Protection domain internal fault：When the relay protection set of generator is made as differential protection, as shown in Fig. 2, generator goes out
Line side and neutral point side are connected separately with current transformer, between outgoing line side current transformer and neutral point side current transformer
Part is known as in protection domain (with 1 example of region in Fig. 2), between outgoing line side current transformer and neutral point side current transformer
Circuit on device fails when, it is believed that generator occur protection domain in failure.
The outer failure of protection domain：In above-mentioned Fig. 2, part except region 1 (including other in the circuit of the generator are set
Other generators in standby either distribution line or data center) it is known as outside protection domain, it breaks down outside protection domain
When, it is believed that the failure outside protection domain occurs for the generator.
Based on background technology there are the problem of, the embodiment of the present invention provides a kind of generator relay protecting method and circuit,
In the scene run applied to more generator parallels in data center, the neutral grounding mode of the more generators is through small
Resistance single-point grounding (i.e. neutral grounding mode described in (b) in Fig. 1), for each generator, using differential guarantor
Protection mechanism (i.e. the outgoing line side of generator and neutral point side are respectively connected with current transformer) passes through the neutral point side electricity of generator
Stream, the outgoing line side electric current of generator and the action current of differential current relay, determine whether generator occurs protection domain
Interior failure can more quickly and accurately determine the generator to break down.
Generator relay protecting method and circuit provided in an embodiment of the present invention can be applied to the middle pressure in data center
Diesel-driven generator can also be applied to other generators, the embodiment of the present invention such as middle pressure gas electricity generator and be not especially limited.It needs
It is noted that in more in data center the neutral grounding mode of pressure diesel-driven generator be through low resistance single-point grounding,
Below by taking the middle pressure diesel-driven generator of data center as an example, generator relay protection side provided in an embodiment of the present invention is discussed in detail
Method and circuit.
The embodiment of the present invention provides a kind of generator relay protection circuit, which can be applied in data
In the scene of more generator parallels operation in the heart, as shown in figure 3, with a generator in simultaneously more generators of machine operation
For, which includes neutral point side current transformer 10, outgoing line side current transformer 11 and differential
Electric current relay 12 (in Fig. 3, differential current relay 12 includes 12a, 12b and 12c), wherein neutral point side current transformer
10 and outgoing line side current transformer 11 respectively include three-phase windings, every phase winding of three-phase windings corresponds to a difference current respectively
Relay (be respectively 12a, 12b and 12c), in one end and generator of each phase winding of neutral point side current transformer 10
Property the connection of point side, the outgoing line side of one end of each phase winding of outgoing line side current transformer 11 and generator connects, and neutral
The other end of the other end and each phase winding of outgoing line side current transformer 11 of each phase winding of point side current transformer 10
It is respectively connected to the input terminal of corresponding differential current relay.
In figure 3, the three-phase windings of neutral point side current transformer 10 are denoted as A1, B1 and C1 respectively, and outgoing line side electric current is mutual
The three-phase windings of sensor 11 are denoted as A2, B2 and C2 respectively.Every phase winding of three-phase windings corresponds to a difference current relay respectively
Device, i.e. winding A1, winding A2 correspond to differential current relay 12a, and winding B1, winding B2 correspond to differential current relay 12b, around
Group C1, winding C2 correspond to differential current relay 12c.Specifically, the neutrality of one end (being denoted as the ends p1) and generator of winding A1
The connection of point side, the input terminal x1 of the other end (being denoted as the ends q1) the connection differential current relay 12a of winding A1, similarly, winding B1
The ends p1 and the neutral point side of generator connect, the ends q1 of winding B1 are connected to the input terminal x2 of differential current relay 12b, around
The ends p1 of group C1 and the neutral point side of generator connect, and the ends q1 of winding C1 are connected to the input terminal of differential current relay 12c
x3；One end (being denoted as the ends p2) of winding A2 is connect with the outgoing line side of generator, and the other end (being denoted as the ends the q2) connection of winding A2 is poor
The input terminal x1 of streaming current relay 12a, similarly, the ends p2 of winding B2 and the outgoing line side of generator are connected, the ends q2 of winding B2
It is connected to the input terminal x2 of differential current relay 12b, the ends p2 of winding C2 and the outgoing line side of generator connect, the q2 of winding C2
End is connected to the input terminal x3 of differential current relay 12c, and the connection relation of all parts is referring specifically to Fig. 3.
Above-mentioned neutral point side current transformer 10, for obtaining neutral point side electric current.
In the embodiment of the present invention, neutral point side current transformer can be converted to the neutral point side primary current of generator
Secondary current, wherein primary current is more than secondary current.It, will be after the conversion of neutral point side current transformer in following embodiment
Electric current (i.e. secondary current) be known as neutral point side electric current.
It should be noted that since neutral point side current transformer includes three-phase windings, neutral point side electric current includes
The direction of three-phase current, the three-phase current is identical, and the size of the three-phase current can be identical or different.
Above-mentioned outgoing line side current transformer 11, for obtaining outgoing line side electric current.
In the embodiment of the present invention, outgoing line side current transformer can be converted to the outgoing line side primary current of generator secondary
Electric current, wherein primary current is more than secondary current.It, will be through the transformed electric current of outgoing line side current transformer in following embodiment
(i.e. secondary current) is known as outgoing line side electric current.
It is similar to above-mentioned neutral point side current transformer, since outgoing line side current transformer also includes three-phase windings, outlet
Side electric current includes three-phase current, and the direction of the three-phase current is identical, and the size of the three-phase current can be identical or different.
Above-mentioned differential current relay 12, for according to neutral point side electric current, outgoing line side electric current and difference current relay
The action current of device, determines whether generator occurs the failure in protection domain.
Wherein, the action current of differential current relay meets：Idz＞ Ibpmax, and Idz≥K×IN, wherein IdzFor difference
The action current of streaming current relay, IbpmaxFor maximum imbalance current, K is safety factor, INFor the rated current of generator.
Specifically, above-mentioned IdzMay include Idz_a、Idz_bAnd Idz_c, these three electric currents are respectively differential current relay
The respective action current of 12a, 12b, 12c, similarly IbpmaxCan also include Ibpmax_a、Ibpmax_bAnd Ibpmax_c, these three electric currents
The respectively corresponding maximum imbalance currents of differential current relay 12a, 12b, 12c.
In the embodiment of the present invention, the action current of differential current relay is more than maximum imbalance current, can to avoid by
When the out-of-balance current that neutral point side current transformer and outgoing line side current transformer are formed inputs differential current relay, lead
Differential current relay malfunction is caused, and the action current of differential current relay is more than or equal to K times of rated current,
When can flow into differential current relay to avoid the electric current formed due to secondary current circuit breaking, lead to differential current relay
Malfunction.
Optionally, in the embodiment of the present invention, the value of the action current of differential current relay can be K × Ibpmax, K is can
By coefficient (such as the value of K can be 1.3), the action current of differential current relay may be that other meet actual use
The value of demand, the embodiment of the present invention are not especially limited.
Optionally, differential current relay 12 are specifically used for, according to neutral point side electric current and outgoing line side electric current, determining differential
The input current of electric current relay；In neutral point side sense of current and outgoing line side sense of current on the contrary, and difference current
When the value of the input current of relay is more than or equal to the value of the action current of differential current relay, generator is determined
Failure in protection domain；It is identical as outgoing line side sense of current in neutral point side sense of current, and difference current relay
When the value of the input current of device is less than the value of the action current of differential current relay, determine that generator does not occur in protection domain
Failure.
It should be noted that in the embodiment of the present invention, three differential current relays of above-mentioned three-phase windings correspondence, this three
Differential current relay is respectively according to the dynamic of corresponding neutral point side electric current, outgoing line side electric current and differential current relay
Make electric current, determines whether generator occurs the failure in protection domain, it is then respectively true in conjunction with three differential current relays
It is fixed as a result, determining whether generator occurs the failure in protection domain.
Illustratively, in conjunction with Fig. 3, three-phase current that three-phase current that neutral point side electric current includes, outgoing line side electric current include
And the corresponding differential current relay of each phase current is as shown in table 1 below.
Table 1
| Neutral point side electric current i1 | Outgoing line side electric current i2 | Differential current relay |
| i1A | i2A | Differential current relay 12a |
| i1B | i2B | Differential current relay 12b |
| i1C | i2C | Differential current relay 12c |
In table 1, the three-phase current which includes is respectively i1A、i1BAnd i1C, wherein current transformer 10
Winding A1 correspond to i1A, the winding B1 of current transformer 10 corresponds to i1B, the winding C1 of current transformer 10 corresponds to i1C, outgoing line side
The three-phase current that electric current includes is respectively i2A、i2BAnd i2C, wherein the winding A2 of current transformer 11 corresponds to i2A, current transformer
11 winding B2 corresponds to i2B, the winding C2 of current transformer 11 corresponds to i2C。
Illustratively, with i1AAnd i2AFor, differential current relay 12a can be according to i1AAnd i2ADetermine the difference current
The input current i of relay 12aJa, iJa=i1A+i2A, it is assumed that the input current i of differential current relay 12aJaValue be IJa,
The value of the action current of differential current relay 12a is Idz_aIf i1ADirection and i2ADirection on the contrary, and IJa≥Idz_a,
That is the input current of differential current relay 12a has been more than the action current of differential current relay 12a, at this time difference current
Relay 12a determines that the failure in protection domain occurs for generator, and the relay switch of differential current relay 12a is closed.If
i1ADirection and i2ADirection it is identical, and IJa＜ Idz_a, i.e. the input current of differential current relay 12a is less than the difference
The action current of streaming current relay 12a, at this time differential current relay 12a determine that the event in protection domain does not occur for generator
Barrier, the constant (state of the relay switch of differential current relay 12a of state of the relay switch of differential current relay 12a
It is kept open).
As shown in figure 4, in a kind of optional realization method, i1ADirection be from neutral point side current transformer to flow to generator
Direction, i2ADirection be i.e. i when flowing to the direction of generator from outgoing line side current transformer1ADirection and i2ADirection phase
Instead, then for the reference point M in Fig. 4, according to kirchhoff's principle, it is known that the input current i of differential current relay 12aJa's
Value is：
IJa=I1A+I2A
Wherein, IJaFor the input current i of differential current relay 12aJaValue, I1AFor i1AValue, I2AFor i2AValue.
As shown in figure 5, in another optional realization method, i1ADirection be from neutral point side current transformer flow to send out
The direction of motor, i2ADirection be i.e. i when flowing to the direction of outgoing line side current transformer from generator1ADirection and i2ADirection
It is identical, then for the reference point M in Fig. 5, according to kirchhoff's principle, it is known that the input current i of differential current relay 12aJa
Value be：
IJa=I1A-I2A
It should be noted that in the embodiment of the present invention, the spy of neutral point side current transformer and outgoing line side current transformer
When property is identical, I1AWith I2AIt is equal, then flow into the value I of the electric current of differential current relay 12aJaIt is 0, it is determined that generator is not sent out
Failure in raw protection domain；When neutral point side current transformer is identical as the characteristic of outgoing line side current transformer, I1AWith I2AIt can
Can be unequal, there is electric current to flow through differential current relay 12a at this time, this flows through differential current relay 12a and is known as uneven electricity
Stream, since the value of the action current of differential current relay 12a is more than the corresponding maximum uneven electricity of differential current relay 12a
Stream, i.e. Idz_a＞ Ibpmax_a, it is determined that the failure in protection domain does not occur for generator.
Optionally, in the embodiment of the present invention, it includes generator normal operation that the failure in protection domain, which does not occur, for generator
Or the failure outside protection domain occurs for generator.
In the embodiment of the present invention, differential current relay 12b, differential current relay 12c determine whether generator occurs
The method of failure in protection domain determines whether generator occurs the event in protection domain with above-mentioned differential current relay 12a
The method of barrier is similar, determines whether generator is protected for specific differential current relay 12b, differential current relay 12c
The associated description for protecting the failure in range specifically may refer to determine hair for differential current relay 12a in above-described embodiment
Whether motor occurs the description of the failure in protection domain, and details are not described herein again.
Optionally, in conjunction with Fig. 3, as shown in fig. 6, generator relay protection circuit provided in an embodiment of the present invention further includes letter
Number relay 13 jumps degaussing switch 14, TA wire-break relays 15 and disconnection signal relay 16, and TA is the electricity of electric current relay
Gas symbol.Wherein, the output end of differential current relay 12a, 12b and 12c connects with the input terminal of signal relay 13 respectively
It connects；The output end of signal relay 13 is connect with the input terminal for jumping degaussing switch 14；Differential current relay 12a, 12b and
The output end of 12c is connect with the input terminal of TA wire-break relays 15 respectively, the output end ground connection of TA wire-break relays 15, and TA
The outlet of wire-break relay 15 is connect with the input terminal of disconnection signal relay 16, the neutral point of neutral point side current transformer and
The neutral point of outgoing line side current transformer is grounded.
Above-mentioned signal relay 13, at least one of differential current relay 12a, 12b, 12c difference currents
(value of the input current of i.e. at least one differential current relay is more than or equal to corresponding the relay switch closure of relay
The value of the action current of difference current oscillator) when, export fault-signal.Specifically, differential current relay 12a, 12b, 12c
At least one of differential current relay relay switch be closed can the relay switch of trigger signal relay 13 be closed, with defeated
Be out of order signal.
Above-mentioned jump degaussing switch 14, for when the relay switch of signal relay 13 is closed, magnetic switch to be closed to touch
The generator of protection domain internal fault occurs for hair excision, avoids the other equipment in the generator system to data center or matches
Electric line causes to impact and cause secondary failure.
It should be noted that in the embodiment of the present invention, these three are differential by above-mentioned differential current relay 12a, 12b and 12c
When the value of the input current of electric current relay is respectively less than the value of the action current of corresponding differential current relay, it is determined that the hair
Motor is the failure occurred in protection domain, and the state of the relay switch of differential current relay 12a, 12b and 12c is constant (still
It is in an open state), generator continues to run with.
Above-mentioned TA wire-break relays 15, for judging whether Current Transformer Secondary current loop breaks, in relay
The value of the input current of device 15 is more than or equal to the value of the action current of TA wire-break relays 15, determines that secondary current circuit is sent out
Raw broken string；It is less than the value of the action current of the TA wire-break relays 15 in the value of the input current of TA wire-break relays 15, determines
Do not break in secondary current circuit.
Above-mentioned disconnection signal relay 16, for when the relay switch of TA wire-break relays 15 is closed, closing its relay
Switch, and export disconnection signal.
It should be noted that in the embodiment of the present invention, more generator parallels of data center are run, and more power generations
The neutral grounding mode of machine is through low resistance single-point grounding, compared with the earthing mode of generator multipoint earthing, using single-point
When the earthing mode of contact, fault current when alternator failure is smaller, can be reduced to a certain extent to power generation
The impact of other equipment or distribution line in machine system.
It, should if the generator that the generator is grounded in being more and the generator of machine operation by taking a generator as an example
The Neutral Point Through Low Resistance of generator, as shown in fig. 6, the neutral point of the generator is grounded through low resistance R；If the generator
For more and machine operation generators in earth-free generator, as shown in fig. 7, the isolated neutral of the generator.
Further, when being all made of above-mentioned mechanical and electrical protection circuit for more generators of data center, on the one hand, more
When the failure in protection domain occurs for the generator through low resistance grounding in generator, the input current of differential current relay is small
The failure in protection domain occurs in the tolerance electric current of neutral-point grounding resistance cabinet, therefore in the generator through low resistance grounding
When, will not in generator system other equipment or distribution line cause to impact；On the other hand, it is not connect in more generators
When failure in protection domain occurs for the generator on ground, the input current of differential current relay is less than neutral-point grounding resistance cabinet
Tolerance electric current, therefore earth-free generator occur protection domain in failure when, will not be in generator system
Other equipment or distribution line cause to impact.
Generator relay protection circuit provided in an embodiment of the present invention, more generator parallels being applied in data center
In the scene of operation, and the neutral grounding mode of more generators is through low resistance single-point grounding, the neutral point of generator
Side and outgoing line side are respectively connected with current transformer, so as to according to neutral point side electric current, outgoing line side electric current and difference current
The action current of relay, determines whether generator occurs the failure in protection domain, with overcurrent protection phase in the prior art
Than due to that can determine generator according to neutral point side electric current, the action current of outgoing line side electric current and differential current relay
Whether failure protection domain in is occurred, and the generator for the failure in protection domain occurs is cut off, for not occurring
The generator of failure in protection domain is reliably failure to actuate (i.e. generator continues to run), so, it is possible to accurately determine hair
The generator of raw failure, and cut off fault generator.
Further, generator relay protection circuit provided in an embodiment of the present invention is determining generator generation protection model
When enclosing interior failure, the generator of failure can be cut off no-delayly, and compared with overcurrent protection in the prior art, the present invention is real
The generator relay protection circuit for applying example offer is more sensitive to the failure within the scope of generator protection, can quickly determine hair
The generator of raw failure.
The relay protecting method of generator provided in an embodiment of the present invention can be applied to more generators in data center
And in the scene of machine operation, and the neutral grounding mode of more generators is to be generated electricity with more through low resistance single-point grounding
For a generator in machine, the executive agent of the relay protecting method of the generator can be generator relay protection circuit
In after electric control module, in conjunction with Fig. 3, as shown in figure 8, this method may include S101-S103：
S101, generator neutral point side electric current is obtained.
The neutral point side electric current is the transformed electric current of current transformer through generator neutral point side.
S102, generator outlet side electric current is obtained.
The outgoing line side electric current is the transformed electric current of current transformer through generator outlet side.
S103, according to neutral point side electric current, the action current of outgoing line side electric current and differential current relay, determine power generation
Whether machine occurs the failure in protection domain.
Description for the related content of S101-S103, specifically may refer to it is above-mentioned for generator as shown in Figure 3 after
The description of related content in electric protection circuit, details are not described herein again.
Optionally, in conjunction with Fig. 8, as shown in figure 9, above-mentioned S103 can specifically be realized by S1031-S1032：
S1031, according to neutral point side electric current and outgoing line side electric current, determine the input current of differential current relay.
S1032, the value according to the action current of the value and differential current relay of the input current of differential current relay,
Determine whether generator occurs the failure in protection domain.
For the associated description of S1031-S1032, may refer in above-mentioned generator relay protection circuit for differential electricity
The specific descriptions of current relay 12 (including differential current relay 12a, 12b and 12c), details are not described herein again.
Optionally, in the embodiment of the present invention, above-mentioned S1032 can specifically include S1032a or S1032b：
It is as shown in Figure 10, above-mentioned according to neutral point side electric current and outgoing line side electric current in conjunction with Fig. 9, determine difference current relay
After the input current of device, it can execute：
S1032a, neutral point side sense of current and outgoing line side sense of current are on the contrary, and differential current relay
When the value of input current is more than or equal to the value of the action current of differential current relay, determine that protection domain occurs for generator
Interior failure.
It is as shown in figure 11, above-mentioned according to neutral point side electric current and outgoing line side electric current in conjunction with Fig. 9, determine difference current relay
After the input current of device, it can execute：
S1032b, neutral point side sense of current are identical as outgoing line side sense of current, and differential current relay
When the value of input current is less than the value of the action current of differential current relay, determine that the event in protection domain does not occur for generator
Barrier.
In the embodiment of the present invention, in conjunction with Fig. 3, neutral point side electric current and outgoing line side electric current respectively include three-phase current, this three
Every phase current of phase current corresponds to a differential current relay respectively, and in conjunction with Fig. 8, as shown in figure 12, above-mentioned S103 specifically may be used
To be realized by S1033-S1034：
S1033, according to every phase current of neutral point side and every phase current of outgoing line side, determine the difference current of each after
The input current of electric appliance.
S1034, according to the value of the input currents of three differential current relays and three differential current relays respectively
Action current value, determine whether generator occurs the failure in protection domain.
Optionally, in the embodiment of the present invention, above-mentioned S1034 can specifically include S1034a or S1034b：
It is as shown in figure 13, above-mentioned according to neutral point side electric current and outgoing line side electric current in conjunction with Figure 12, determine difference current relay
After the input current of device, it can execute：
S1034a, neutral point side sense of current and outgoing line side sense of current are on the contrary, and corresponding with three-phase current
The value of the input current of at least one of three differential current relays differential current relay is more than or equal to differential electricity
When the value of the action current of current relay, determine that the failure in protection domain occurs for generator；
It is as shown in figure 14, above-mentioned according to neutral point side electric current and outgoing line side electric current in conjunction with Figure 12, determine difference current relay
After the input current of device, it can execute：
S1034b, neutral point side sense of current and outgoing line side sense of current are on the contrary, and corresponding with three-phase current
When the value of the input current of three differential current relays is respectively less than the value of the action current of differential current relay, power generation is determined
Failure in protection domain does not occur for machine.
In the embodiment of the present invention, above-mentioned generator do not occur the failure in protection domain include generator normal operation or
Failure outside protection domain occurs for generator.
It should be noted that generator relay protecting method provided in an embodiment of the present invention can be applied to above-described embodiment
Described in generator relay protection circuit in, for the detailed description of each step of generator relay protecting method, referring to
For the description of the related content of generator relay protection circuit in above-described embodiment, details are not described herein again.
Generator relay protecting method provided in an embodiment of the present invention is applied to more generator parallel fortune in data center
In capable scene, and the neutral grounding mode of more generators is through low resistance single-point grounding, due to can be according to neutrality
The action current of point side electric current, outgoing line side electric current and differential current relay, determines whether generator occurs in protection domain
Failure, cut off for the generator of failure in protection domain occurs, for the failure in protection domain does not occur
Generator is reliably failure to actuate, and so, it is possible to accurately determine the generator to break down, and cut off fault generator.
Further, generator relay protecting method provided in an embodiment of the present invention is determining generator generation protection model
When enclosing interior failure, the generator of failure can be cut off no-delayly, and compared with overcurrent protection in the prior art, the present invention is real
The generator relay protection circuit for applying example offer is more sensitive to the failure within the scope of generator protection, can quickly determine hair
The generator of raw failure.
The above, the only specific implementation mode of the application, but the protection domain of the application is not limited thereto, it is any
Change or replacement in the technical scope that the application discloses, should all cover within the protection domain of the application.Therefore, this Shen
Protection domain please should be based on the protection scope of the described claims.
Claims (9)
1. a kind of generator relay protecting method, which is characterized in that be applied to what more generator parallels in data center were run
In scene, the neutral grounding modes of the more generators be through low resistance single-point grounding, the method includes：
Generator neutral point side electric current is obtained, the neutral point side electric current is the current transformer through the generator neutral point side
Transformed electric current；
Generator outlet side electric current is obtained, the outgoing line side electric current is after the conversion of the current transformer of the generator outlet side
Electric current；
According to the neutral point side electric current, the action current of the outgoing line side electric current and differential current relay, determine described in
Whether generator occurs the failure in protection domain.
2. according to the method described in claim 1, it is characterized in that,
The action current of the differential current relay meets：Idz＞ Ibpmax, and Idz≥K×IN, wherein IdzFor the difference
The action current of streaming current relay, IbpmaxFor maximum imbalance current, K is safety factor, INFor the specified of the generator
Electric current.
3. method according to claim 1 or 2, which is characterized in that described according to the neutral point side electric current, the outlet
The action current of side electric current and differential current relay, determines whether the generator occurs the failure in protection domain, packet
It includes：
According to the neutral point side electric current and the outgoing line side electric current, the input current of differential current relay is determined；
The neutral point side sense of current and the outgoing line side sense of current are on the contrary, and the differential current relay
When the value of input current is more than or equal to the value of the action current of the differential current relay, determine that the generator occurs
Failure in protection domain；
The neutral point side sense of current is identical as the outgoing line side sense of current, and the differential current relay
When the value of input current is less than the value of the action current of the differential current relay, determine that the generator does not occur to protect model
Enclose interior failure.
4. according to the method described in claims 1 to 3 any one, which is characterized in that the neutral point side electric current and it is described go out
Line side electric current respectively includes three-phase current, and every phase current of the three-phase current corresponds to a differential current relay, institute respectively
The action current according to the neutral point side electric current, the outgoing line side electric current and differential current relay is stated, determines the hair
Whether motor occurs the failure in protection domain, including：
According to every phase current of every phase current of the neutral point side and the outgoing line side, the difference current relay of each is determined
The input current of device；
The neutral point side sense of current and the outgoing line side sense of current are on the contrary, and corresponding with the three-phase current
The value of the input current of at least one of three differential current relays differential current relay is more than or equal to differential electricity
When the value of the action current of current relay, determine that the failure in protection domain occurs for the generator；
The neutral point side sense of current and the outgoing line side sense of current are on the contrary, and corresponding with the three-phase current
When the value of the input current of three differential current relays is respectively less than the value of the action current of differential current relay, described in determination
Failure in protection domain does not occur for generator.
5. method according to claim 3 or 4, which is characterized in that
It includes that the generator normal operation or the generator occur that failure in protection domain, which does not occur, for the generator
Failure outside protection domain.
6. a kind of generator relay protection circuit, which is characterized in that be applied to what more generator parallels in data center were run
In scene, the neutral grounding mode of the more generators is through low resistance single-point grounding, the generator relay protection electricity
Road includes neutral point side current transformer, outgoing line side current transformer and differential current relay, wherein the neutral point
Side current transformer and the outgoing line side current transformer respectively include three-phase windings, every phase winding difference of the three-phase windings
A corresponding differential current relay, one end and the generator of each phase winding of the neutral point side current transformer
Neutral point side connects, and one end of each phase winding of the outgoing line side current transformer is connect with the outgoing line side of the generator,
Each phase winding of the other end of each phase winding of the neutral point side current transformer and the outgoing line side current transformer
The other end be respectively connected to the input terminal of corresponding differential current relay；
The neutral point side current transformer, for obtaining neutral point side electric current；
The outgoing line side current transformer, for obtaining outgoing line side electric current；
The differential current relay, for according to the neutral point side electric current, the outgoing line side electric current and the differential electricity
The action current of current relay, determines whether the generator occurs the failure in protection domain.
7. circuit according to claim 6, which is characterized in that
The action current of the differential current relay meets：Idz＞ Ibpmax, and Idz≥K×IN, wherein IdzFor the difference
The action current of streaming current relay, IbpmaxFor maximum imbalance current, K is safety factor, INFor the specified of the generator
Electric current.
8. the circuit described according to claim 6 or 7, which is characterized in that
The differential current relay is specifically used for, according to the neutral point side electric current and the outgoing line side electric current, determining differential
The input current of electric current relay；In the neutral point side sense of current and the outgoing line side sense of current on the contrary, and
The value of the input current of the differential current relay is more than or equal to the value of the action current of the differential current relay
When, determine that the failure in protection domain occurs for the generator；In the neutral point side sense of current and outgoing line side electricity
The direction of stream is identical, and the value of the input current of the differential current relay is less than the action of the differential current relay
When the value of electric current, determine that the failure in protection domain does not occur for the generator.
9. circuit according to claim 8, which is characterized in that
It includes that the generator normal operation or the generator occur that failure in protection domain, which does not occur, for the generator
Failure outside protection domain.
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|---|---|---|---|
| CN201810369248.3A CN108565835A (en) | 2018-04-23 | 2018-04-23 | Generator relay protecting method and circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810369248.3A CN108565835A (en) | 2018-04-23 | 2018-04-23 | Generator relay protecting method and circuit |
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