CN110364990A - Nuclear power station injection type power generator stator grounding insulation measurement precision regulation method - Google Patents
Nuclear power station injection type power generator stator grounding insulation measurement precision regulation method Download PDFInfo
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- CN110364990A CN110364990A CN201910481753.1A CN201910481753A CN110364990A CN 110364990 A CN110364990 A CN 110364990A CN 201910481753 A CN201910481753 A CN 201910481753A CN 110364990 A CN110364990 A CN 110364990A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- 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
- H02H3/006—Calibration or setting of parameters
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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
Abstract
The invention belongs to generator of nuclear power station and its auxiliary system technical fields; more particularly to nuclear power station injection type power generator stator grounding insulation measurement precision regulation method, comprising the following steps: inject low frequency signal source in injection type power generator stator ground fault protection system；According to the low frequency signal source in injection mode and the electric parameter of related component in the injection type power generator stator ground fault protection system, the equivalent equivalent circuit for obtaining the injection type power generator stator ground fault protection system in the injection type power generator stator ground fault protection system；Modeling Calculation is carried out according to the equivalent circuit, obtains the relational expression of the measurement of ground insulation resistance and its precision adjustment of the injection type power generator stator ground fault protection system；According to the relational expression, relevant parameter in protective device is adjusted, so that the calculated value for reducing the insulation resistance and the protective device are to the error between the measured value of the insulation resistance.
Description
Technical field
The invention belongs to generator of nuclear power station and its auxiliary system technical field more particularly to nuclear power station injection type power generators
Stator ground fault protection measuring accuracy method of adjustment.
Background technique
Generator stator winding single-phase earthing is generator one of the most common type failure, is alternate or turn-to-turn short circuit elder generation
Million, perfect stator single phase ground fault protection plays significant role to the safe operation of generator.With the increase of generator capacity,
Since stator winding direct-to-ground capacitance increases the application with novel cooling technology, the harm of grounding of stator winding failure is more serious,
A possibility that ground fault, also further increases.Therefore, large and medium generator installs 100% stator ground fault protection ten without dead zone
Divide necessity.
Additional 20Hz injected type stator ground protection is unrelated with the ground fault position of generator unit stator winding, and can reflect
The decline situation of stator winding insulation, there is more application in Generator Set.
Currently, frequently encountering insulation measurement inaccuracy or essence when protective device is put into operation for the first time with routine test
The not high situation of exactness needs to adjust every compensating parameter repeatedly, and can follow without rule, these situations annoying life always
Produce field maintenance technical staff；And insulation measurement accuracy is not high, parameter matches random method, it would be possible to
Lead to the false alarm of protective device or do not alarm, loses the real-time monitoring effect to generator stator insulator, increase simultaneously
Maintenance technician's extensive work.
Therefore, there is a problem of that insulation measurement inaccuracy or accuracy be not high in traditional technical solution.
Summary of the invention
The purpose of the present invention is to provide nuclear power station injection type power generator stator grounding insulation measurement precision adjustment sides
Method, it is intended to solve the problems, such as that the inaccuracy of insulation measurement present in traditional technical solution or accuracy be not high.
The embodiment of the invention provides nuclear power station injection type power generator stator grounding insulation measurement precision regulation method,
The following steps are included:
Low frequency signal source is injected in injection type power generator stator ground fault protection system；
According to injection mode of the low frequency signal source in the injection type power generator stator ground fault protection system and institute
The electric parameter of related component in injection type power generator stator ground fault protection system is stated, it is equivalent to obtain the injection type power generator
The equivalent circuit of stator ground fault protection system；
Modeling Calculation is carried out according to the equivalent circuit, obtains connecing for the injection type power generator stator ground fault protection system
The relational expression of the measurement of ground insulation resistance resistance value and its precision adjustment；
According to the relational expression, relevant parameter in protective device is adjusted, to reduce the reason of the insulation resistance
By calculated value and the protective device to the error between the measured value of the insulation resistance.
Relevant parameter in the protective device is adjusted in one of the embodiments, and includes:
When generator outlet breaker is in gate-dividing state, make institute by adjusting the angle compensation parameter of the protective device
State the angle value of protective device close to the low frequency signal source electric current leading voltage angle value.
Relevant parameter in the protective device is adjusted in one of the embodiments, further include:
The series resistance compensation parameter of the protective device is adjusted to generator stator single-phase earthing fault transition resistance
Value, to compensate the secondary resistance value of the protective device.
Relevant parameter in the protective device is adjusted in one of the embodiments, further include:
The angle compensation parameter and series resistance compensation parameter of the protective device are all made of the generator outlet open circuit
Device is in measured data when gate-dividing state, and parallel resistance compensating parameter is set as infinitely great, then closes the generator
Outlet breaker reads the secondary resistance parameter of the protective device at this time, and its is inverted as the protective device
Shunt admittance parameter value.
In one of the embodiments, in the injection type power generator stator ground fault protection system related component it is electrical
Parameter includes the short-circuit impedance of generator neutral point grounding transformer and its contact electricity of leakage reactance, low-frequency voltage current measurement circuit
Resistance and cable resistance, the equivalent impedance of HV Auxiliary Transformer neutral grounded transformer and generator unit stator winding are electric over the ground
Hold.
In one of the embodiments, during the Modeling Calculation, generator unit stator winding capacitance to earth pair is disregarded
The influence of the relational expression.
The relational expression in one of the embodiments, are as follows:
Wherein, V64sFor low frequency injecting voltage；I64sFor low frequency Injection Current；Rs is that generator neutral point ground connection becomes road etc. again
Imitate series resistance；Rp is that the change neutral ground of high factory becomes road equivalent parallel resistance again；θ is voltage and electric current folder before phase compensation
Angle；For phase compensation angle；1/Rp corresponds to the parallel resistance compensating parameter in the protective device；Rs corresponds to the protective device
In series resistance compensation parameter；Angle compensation parameter in the corresponding protective device；Rf, which is that generator unit stator is single-phase, to be connect
Earth fault transition resistance, the ground insulation resistance of the as described injection type power generator stator ground fault protection system.
The injection type power generator stator ground fault protection system includes adjustable rheostat, hair in one of the embodiments,
Generator neutral point ground connection becomes secondary load resistance, divider, generator neutral point grounding transformer, current measurement Current Mutual Inductance
Device, bandpass filter, low-frequency signal injection source and protective device；Generator neutral point ground terminal respectively with the adjustable rheostat
First end, the generator neutral point grounding transformer armature winding first end connection；Described adjustable rheostatic
Two ends, the generator neutral point grounding transformer the second end of armature winding be grounded；The generator neutral point ground connection
The first end of the secondary windings of transformer is grounded the first end, described for becoming secondary load resistance with the generator neutral point respectively
The first end of divider, the connection of the second end of the bandpass filter；The first end of the bandpass filter and the low frequency are believed
Number injection source first end connection；The second end in the low-frequency signal injection source becomes two with generator neutral point ground connection respectively
The second end of secondary load resistance, the second end of the divider, the generator neutral point grounding transformer secondary windings
Second end connection, and be grounded；The second end and sliding end of the divider are defeated as the low-frequency voltage acquisition of the protective device
Enter end；The current transformer is used to acquire low-frequency current and it is transferred to the low-frequency current acquisition input of the protective device
End.
The equivalent circuit includes generator stator single-phase earthing fault transition resistance, height in one of the embodiments,
Factory becomes neutral ground and becomes that road equivalent parallel resistance, to become road equivalent series resistance, generator again fixed for generator neutral point ground connection again
Sub- winding equivalent capacitive reactance and phase compensation block over the ground；The first end of low frequency injecting voltage respectively with the generator unit stator list
Phase ground fault transition resistance, the high factory become neutral ground and become the first end of road equivalent parallel resistance, the generator again
Stator winding over the ground equivalent capacitive reactance first end connection；The input of the second end of low frequency injecting voltage and the phase compensation block
End connection；The output end of the phase compensation block becomes road equivalent series resistance again with generator neutral point ground connection respectively
Second end, the generator unit stator winding over the ground equivalent capacitive reactance second end connection；The generator neutral point ground connection becomes road again
The first end of equivalent series resistance becomes neutral point with the generator stator single-phase earthing fault transition resistance, high factory respectively and connects
Ground becomes the second end connection of road equivalent parallel resistance again.
It is verified by field test and engineer application, the embodiment of the present invention is possessed beneficial to effect compared with the existing technology
Fruit: the embodiment of the present invention protects wiring in kind to take out mathematical model from generator stator ground, and divides mathematical model
Analysis and transformation, are improved the relational expression of insulation measurement precision, by adjusting the relevant parameter in relational expression, effectively improve
The accuracy of protective grounding resistance measurement；Meanwhile the efficiency of protective grounding resistance measurement is improved, so that in measurement process
Parameter configuration and adjustment are more regular；The raising of protective grounding resistance measurement accuracy of the embodiment of the present invention directly improves power generation
The sensitivity and reliability of machine stator ground fault alarm.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the injection type power generator stator grounding insulation measurement precision regulation method process of the embodiment of the present invention
Figure；
Fig. 2 is the circuit diagram of the injection type power generator stator ground fault protection system of the embodiment of the present invention；
Fig. 3 is the equivalent circuit schematic diagram of injection type power generator stator ground fault protection system shown in Fig. 2；
Fig. 4 is the Curve of the Measuring Error figure of the embodiment of the present invention；
Fig. 5 is the theoretical value and actual comparison curve graph of the insulation resistance when embodiment of the present invention be in gate-dividing state；
Fig. 6 is the theoretical value and actual comparison curve graph of the insulation resistance when embodiment of the present invention be in "on" position.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
In embodiments of the present invention, injection type power generator stator ground fault protection measuring accuracy method of adjustment is from generator
Stator ground fault protection material object wiring, takes out mathematical model, and mathematical model is analyzed and converted, by adjusting compensation ginseng
Number, thus the accuracy for improving protective grounding resistance measurement realized；Meanwhile improving the effect of protective grounding resistance measurement
Rate, so that parameter configuration and adjustment are more regular in measurement process；Protective grounding resistance measurement accuracy of the embodiment of the present invention
Raising, directly improve generator stator ground fault alarm sensitivity and reliability.
In order to illustrate technical solutions according to the invention, it is described in detail below by specific embodiment.
Fig. 1 shows injection type power generator stator grounding insulation measurement precision provided in an embodiment of the present invention adjustment side
Method, details are as follows:
In one embodiment, injection type power generator stator grounding insulation measurement precision regulation method includes following step
It is rapid:
Step S11 injects low frequency signal source in injection type power generator stator ground fault protection system.In the embodiment of the present invention
It using 20Hz signal source as low frequency signal source, illustrates, but is not limited to 20Hz signal source.
Step S12, according to injection of the low frequency signal source in the injection type power generator stator ground fault protection system
The electric parameter of mode and related component in the injection type power generator stator ground fault protection system, it is equivalent to obtain the injection
The equivalent circuit of formula generator stator ground protection system.The injection mode can be from the opening three of generator terminal voltage mutual inductor
Angle winding is injected or can also be injected from neutral grounded transformer secondary side, and used in the embodiment of the present invention is set generator
Neutral point is used through single-phase earthing transformer (low-pressure side connecting resistance) earthing mode, and 20Hz signal is negative from grounding transformer secondary side
The injection of resistance both ends is carried, as shown in Figure 2:
Wherein, V shown in Fig. 264sFor 20Hz injecting voltage；I64sFor 20Hz electric current；G1 is generator unit stator winding；
GCB is generator outlet breaker；TS is HV Auxiliary Transformer；VT1 is generator neutral point grounding transformer；VT2 is height
Press house transformer neutral grounded transformer；RL1 is that generator neutral point ground connection becomes secondary load resistance；RL2 is high pressure factory
With transformer neutral point grounding transformer secondary load resistance；G2 is that 20Hz signal injects source；BP is bandpass filter；CT is
20Hz current measurement Current Transformer；Rd is divider；P345 is protective device；Rx is adjustable rheostat.
The injection type power generator stator ground fault protection system includes adjustable rheostat Rx, generator neutral point ground connection change two
Secondary load resistance RL1, divider Rd, generator neutral point grounding transformer VT1,20Hz current measurement Current Transformer CT,
Bandpass filter BP, 20Hz signal injects source G2 and protective device P345；Generator neutral point ground terminal respectively with it is described adjustable
The first end of rheostat Rx, the generator neutral point grounding transformer VT1 armature winding first end connection；It is described adjustable
The second end of rheostat Rx, the second end of armature winding of the generator neutral point grounding transformer VT1 are grounded；The hair
The first end of the secondary windings of generator neutral point grounding transformer VT1 is grounded with the generator neutral point respectively becomes secondary load
The first end of resistance RL1, the first end of the divider Rd, the connection of the second end of the bandpass filter BP；The band logical filter
The first end of wave device BP is connect with the first end of 20Hz signal injection source G2；The second end of the 20Hz signal injection source G2
It is grounded respectively with the generator neutral point and becomes the second end of the secondary load resistance RL1, second end of the divider Rd, described
The second end of the secondary windings of generator neutral point grounding transformer VT1 connects, and is grounded；The second end of the divider Rd and
20Hz voltage acquisition input terminal of the sliding end as the protective device P345；The Current Transmit is for acquiring 20Hz electricity
Flow and be transferred to it 20Hz current acquisition input terminal of protective device P345.
Its working principle is that: injected type stator ground protection is outer between the stator winding neutral point and the earth of generator
Add the ac voltage signal source of a low frequency (such as 20Hz).When normal operation, electric current is not generated or generates the capacitance current of very little.
When ground fault occurs for stator winding, closed circuit is formed by ground resistance, generates the fault current of 20Hz.This measurement
The method of ground fault is unrelated with the position of stator winding faults point.Generator is static and operational process in there is protection to make
With high sensitivity can continuously monitor stator winding insulation in generator situation of change simultaneously.
Step S13 carries out Modeling Calculation according to the equivalent circuit, obtains the injection type power generator stator ground fault protection
The ground insulation resistance of system measures and its first relational expression of precision adjustment, as follows:
Wherein, V64sFor low frequency injecting voltage；I64sFor low frequency Injection Current；Rs is that generator neutral point ground connection becomes road etc. again
Imitate series resistance；Rp is that the change neutral ground of high factory becomes road equivalent parallel resistance again；θ is voltage and electric current folder before phase compensation
Angle；For phase compensation angle.
For the ease of the influence of parameters all insulation measurement precision in analysis mode (one), equation is carried out to formula (one)
Transformation obtains the second relational expression, as follows:
Wherein, 1/Rp corresponds to the parallel resistance compensating parameter in the protective device；Rs is corresponded in the protective device
Series resistance compensation parameter；Angle compensation parameter in the corresponding protective device；Rf is the event of generator unit stator single-phase earthing
Hinder transition resistance.
Based on the second relational expression it is found that in the case where 20Hz Injection Signal is constant, protective device calculates gained Rf value, with
Rp、Rs、Parameter has direct proportionate relationship.Therefore, Rp, Rs,It is the key parameter for determining protective device Rf accuracy.Suitably
The above parameter is adjusted, more accurate generator unit stator winding resistivity measurements, i.e. insulating resistance value over the ground is can get, makes to protect
It is sensitiveer and reliable.
In formula (one), formula (two), 1/Rp corresponds to the parallel resistance compensating parameter 64S in P345 protective device
Parallel G；Rs corresponds to series resistance compensation parameter 64S Series R；Corresponding angle compensating parameter 64S Angle
Comp。
Protective device by survey and adjustment 1/Rp, Rs,Etc. compensating parameters obtain accurate grounding resistance.
Step S14 is adjusted relevant parameter in protective device according to the relational expression, to reduce the insulation
The calculated value of resistance and the protective device are to the error between the measured value of the insulation resistance.
It is to consider to inject during it is equivalent circuit that the injection type power generator stator ground fault protection is system converting
In formula generator stator ground protection system on the basis of the electric parameter of related component, the equivalent circuit that equivalent-simplification goes out,
The electric parameter of these related components includes the short-circuit impedance and its leakage reactance, low frequency of generator neutral point grounding transformer VT1
The contact resistance and cable resistance in voltage and current measurement circuit, HV Auxiliary Transformer neutral grounded transformer VT2 it is equivalent
Impedance and generator unit stator winding-to-earth capacity.
The equivalent circuit include generator stator single-phase earthing fault transition resistance Rf, high factory become neutral ground become again
Road equivalent parallel resistance Rp, to become road equivalent series resistance Rs, generator unit stator winding again equivalent over the ground for generator neutral point ground connection
Capacitive reactance Xcg and phase compensation block；The first end of the 20Hz injecting voltage is former with the generator unit stator single-phase earthing respectively
Barrier transition resistance Rf, the high factory become neutral ground and become the first end of road equivalent parallel resistance Rp, the generator unit stator again
Winding over the ground equivalent capacitive reactance Xcg first end connection；The second end of the 20Hz injecting voltage and the phase compensation block
Input terminal connection；The output end of the phase compensation block becomes road equivalent series electricity again with generator neutral point ground connection respectively
Hinder the second end connection of the second end of Rs, the generator unit stator winding equivalent capacitive reactance Xcg over the ground；The generator neutral point connects
Ground become again the first end of road equivalent series resistance Rs respectively with the generator stator single-phase earthing fault transition resistance Rf, height
Factory becomes the second end connection that neutral ground becomes road equivalent parallel resistance Rp again.
Wherein, Xcg is the equivalent capacitive reactance over the ground of generator unit stator winding；Rs is that generator neutral point ground connection becomes road equivalent string again
Join resistance；Rp is that the change neutral ground of high factory becomes road equivalent parallel resistance again；Rf is generator stator single-phase earthing fault transition
Resistance (i.e. the measurement resistance of protective device).
Square related due to measurement resistance Rf and Injection Signal frequency, the frequency of Injection Signal is lower, generator unit stator
Influence of the winding-to-earth capacity Cg to Rf is smaller；Therefore, generator unit stator winding is disregarded in the Modeling Calculation of this paper to hold over the ground
Anti- Xcg.
It next will be according to the above method, when being in switching on and off different conditions to generator outlet breaker GCB respectively
Parameter configuration and the adjustment of the accuracy of Rf provide embodiment and illustrate and provide experimental data to be proved, and Details as Follows:
1, compensating parameter setting and Adjustment Tests when generator outlet breaker GCB separating brake.
It is zero by the angle compensation parameter of protective device and series resistance compensation parameter initial setting up, parallel resistance compensation
Parameter is initially set to infinity.
1.1, angle compensation parameterMeasurement and setting.
As shown in Fig. 2, accessing adjustable resistor Rx, analogue ground resistance in generator neutral point grounding transformer primary side
For infinitely great (disconnecting Rx), the angle of check protection device measurement is 64S I Angle.Under such operating condition, 20Hz measures circuit
On impedance be generator unit stator winding-to-earth capacity, be capacitive load, ideally 20Hz electric current answers+90 ° of leading voltage.
Due to being influenced by other equipment on circuit and current transformer measurement error, 64SIAngle is not usually+90 °.Therefore,
It needs by adjusting parameterBy 64SIAngle compensation to close to+90 °.For example, measurement angle is+97 °, then -7 ° are set as；
Measurement angle is 87 °, then is set as+3 °.
In short, when generator outlet breaker is in gate-dividing state, by adjusting the angle compensation of the protective device
Parameter makes the angle value of the protective device close to the angle value of the electric current leading voltage of the low frequency signal source.
1.2, the measurement and setting of series resistance compensation parameter Rs.
Analogue ground resistance is zero ohms (Rx resistance value is adjusted to 0 Ω in Fig. 2), the secondary resistance value of check protection device measurement
64SR Secondary.Ideally, the secondary resistance value that protective device measures at this time should be 0 Ω.But under such operating condition,
Impedance on 20Hz measurement circuit practical further comprises generator neutral point grounding transformer leakage reactance, short-circuit impedance and return cable
The resistance such as wiring, measured value are not 0 Ω.In order to make protective device to generator unit stator winding, resistance measurement is more accurate over the ground,
The influence of this sections in series impedance need to be eliminated when calculating.It therefore, just need to be by the way that parameter Rs be arranged by 64SR Secondary
It compensates close to 0.For example, Rs is set as 10 Ω if Rf is 10 Ω.
In short, the series resistance compensation parameter of the protective device is adjusted to generator stator single-phase earthing fault mistake
Resistance value is crossed, to compensate the secondary resistance value of the protective device.
1.3, protective device ground resistance measurement accuracy is tested.
By changing the resistance value of Rx in Fig. 2, the different ground resistance situation of simulation generator unit stator winding, check protection dress
The accuracy of the measurement resistance Rf set.It is tested in generator outlet breaker GCB separating brake, without the shadow of shunt conductance 1/Rp
It rings, the second relational expression can be reduced to third relational expression.If measurement error is unsatisfactory for standard requirements during test, according to
Third relational expression is by adjusting series resistance compensation parameter Rs and angle compensation parameterThe measurement resistance of changeable protective device
The accuracy of Rf.Third relational expression is as follows:
It can be obtained from third relational expression, in the case where other parameters are constant, Rf is inversely proportional with Rs, withIt is directly proportional.
Rf and standard value deviation adjust when deviation is larger compared with hour adjustment RsIt can be improved the efficiency of adjustment.With Ling'ao nuclear power plant 2
For the test situation of unit, test of many times is carried out according to the above ground resistance measurement accuracy method of adjustment, has been obtained more smart
True Rf data (table 1), as follows:
1100% stator ground fault protection test data (GCB separating brake of table；Rs=6.5 Ω, 1/Rp=0)
2, the setting of compensating parameter and Adjustment Tests when generator outlet breaker GCB closes a floodgate.
Angle compensationIt is constant with series resistance compensation Rs, it is surveyed using generator outlet breaker GCB in open position
Data, shunt admittance 1/Rp compensation is set as 0 (parallel resistance compensation is set as ∞).
2.1,1/Rp measurement and setting.
Generator outlet breaker GCB is closed, HV Auxiliary Transformer neutral grounded transformer VT2 is accessed into protection dress
Set measurement circuit.Also according to test connection is carried out shown in Fig. 2, analogue ground resistance Rx is infinity, reads protection dress at this time
The secondary resistance value 64SR Secondary of measurement resistance is set, and by the inverted numerical value for calculating shunt admittance of the resistance value,
Then admittance numerical value 1/Rp is arranged in the corresponding definite value column of protective device again.
In short, the angle compensation parameter and series resistance compensation parameter of the protective device are all made of the generator and go out
Mouth breaker is in measured data when gate-dividing state, and parallel resistance compensating parameter is set as infinitely great, then closes described
Generator outlet breaker reads the secondary resistance parameter of the protective device at this time, and its is inverted as the guarantor
The shunt admittance parameter value of protection unit.2.2, protective device ground resistance measurement accuracy is tested.
By changing the resistance value Rx in Fig. 2, to simulate different grounding resistances, thus the measurement power generation of check protection device
Accuracy of the machine stator winding to ground resistance.From the second relational expression it can be concluded that, in the case where other parameters are constant, Rf with
Rs is inversely proportional, withIt is directly proportional with 1/Rp.By adjusting these three compensating parameters, more accurate resistivity measurements can be obtained.
By taking the test situation of No. 2 units of Ling'ao nuclear power plant as an example, repeatedly tried according to the above ground resistance measurement accuracy method of adjustment
It tests, obtains more accurate Rf data, as shown in table 2, Details as Follows:
2100% stator ground fault protection test data of table (GCB closes a floodgate,Rs=6.5 Ω；1/Rp=
14.00ms)
Listed by Tables 1 and 2 on the basis of field experiment data, measurement accuracy error curve diagram shown in Fig. 4 has been made,
It can be seen that leading to using injection type power generator stator ground fault protection measuring accuracy method of adjustment provided by the present invention
It crosses after being adjusted to each compensating parameter, when generator unit stator winding earth resistance is below 30k Ω, the measurement of protective device
The accuracy errors of resistance Rf measure relatively accurate, requirement of the satisfaction scene to measurement resistance Rf accuracy in 15%.
In conclusion the embodiment of the present invention passes through the analysis to the pouring-in 100% stator ground fault protection schematic diagram of 20Hz, shape
At protection system equivalent circuit diagram, and then the theoretical calculation of protector measuring generator unit stator winding earth resistance is obtained
Formula.The second relational expression and third relationship are obtained after carrying out equation transformation to the first relational expression according to different primary system structures
Formula.
After being compared and analyzed to the test data in Tables 1 and 2, it was therefore concluded that, protective device surveys resistance value
Almost the same with calculated value, data comparison curve is as shown in Figure 5 and Figure 6, which has absolutely proved the equivalent relationship obtained
The fitting of formula Rf value practical to protective device is accurate.
From the second relational expression and third relational expression: in GCB separating brake, the Rf and Rs of protective device are inversely proportional, at
Direct ratio；When GCB closes a floodgate, the Rf and Rs of protective device are inversely proportional, withIt is directly proportional with 1/Rp.Pass through appropriate adjustment protective device
Above 3 compensating parameters, the accuracy of Rf can be improved.
Table 3 is test data when changing 1/Rp value in the case where other parameters are constant.As can be seen from Table 3,1/Rp value
After being fine-tuning to 14.00ms by 14.02ms, whole reduction trend is presented in the Rf of protective device.Other variation tendencies and theory point
Analysis is consistent.
Generator unit stator winding is to ground resistance Rf test data (GCB combined floodgate) k Ω when 3 difference 1/Rp of table
Additional 20Hz injected type stator ground protection is unrelated with the ground fault position of generator unit stator winding, and can reflect
The decline situation of stator winding insulation, there is more application in Generator Set.It puts into operation in protective device and periodically tries for the first time
When testing, the situation of Rf inaccuracy is frequently encountered, according to method described in the embodiment of the present invention, appropriate adjustment compensating parameter can be mentioned
High ground resistance measuring accuracy and protection reliability.
Injection type power generator stator ground fault protection measuring accuracy method of adjustment is big shown in the embodiment of the present invention
It is applied in the 4 unit injection type power generator stator ground fault protection tests in sub- gulf and Ling'ao nuclear power plant, successfully solves scene protection
The problem of measured value inaccuracy；And the method increase 4 machine injection type power generators of Daya Gulf and Ling'ao nuclear power plant to determine for application
Sub- ground protection measuring accuracy improves protection operational reliability, ensures engine health stable operation, is also greatly saved
The workload of production line maintenance technician.This method can apply the electricity of injection type power generator stator ground fault protection at home
Factory promotes and applies.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. nuclear power station injection type power generator stator grounding insulation measurement precision regulation method, which is characterized in that including following
Step:
Low frequency signal source is injected in injection type power generator stator ground fault protection system；
According to injection mode of the low frequency signal source in the injection type power generator stator ground fault protection system and the note
Enter the electric parameter of related component in formula generator stator ground protection system, it is equivalent to obtain the injection type power generator stator
The equivalent circuit of protection system to earth；
Modeling Calculation is carried out according to the equivalent circuit, show that the ground connection of the injection type power generator stator ground fault protection system is exhausted
The relational expression of the measurement of edge resistance and its precision adjustment；
According to the relational expression, relevant parameter in protective device is adjusted, to reduce the theoretical meter of the insulation resistance
Calculation value and the protective device are to the error between the measured value of the insulation resistance.
2. the method according to claim 1, wherein being adjusted packet to relevant parameter in the protective device
It includes:
When generator outlet breaker is in gate-dividing state, make the guarantor by adjusting the angle compensation parameter of the protective device
The angle value of protection unit close to the low frequency signal source electric current leading voltage angle value.
3. according to claim 1 or claim 2, which is characterized in that adjusted to relevant parameter in the protective device
It is whole further include:
The series resistance compensation parameter of the protective device is adjusted to generator stator single-phase earthing fault transition resistance value, with
Compensate the secondary resistance value of the protective device.
4. according to the method described in claim 3, also being wrapped it is characterized in that, being adjusted to relevant parameter in the protective device
It includes:
The angle compensation parameter and series resistance compensation parameter of the protective device are all made of at the generator outlet breaker
Measured data when gate-dividing state, and parallel resistance compensating parameter is set as infinitely great, then close the generator outlet
Breaker, reads the secondary resistance parameter of the protective device at this time, and by its it is inverted as the protective device and
Join admittance parameter value.
5. also being wrapped the method according to claim 1, wherein being adjusted to relevant parameter in the protective device
It includes:
Angle compensation parameter, the series resistance compensation parameter of the protective device are all made of the generator outlet breaker and are in
Measured data when gate-dividing state, and parallel resistance compensating parameter is set as infinitely great, it is disconnected then to close the generator outlet
Road device, reads the secondary resistance parameter of the protective device at this time, and by its inverted parallel connection as the protective device
Admittance parameter value.
6. the method according to claim 1, wherein phase in the injection type power generator stator ground fault protection system
The electric parameter for closing component includes that the short-circuit impedance of generator neutral point grounding transformer and its leakage reactance, low-frequency voltage electric current are surveyed
Measure the contact resistance and cable resistance, the equivalent impedance of HV Auxiliary Transformer neutral grounded transformer and generator in circuit
Stator winding direct-to-ground capacitance.
7. according to the method described in claim 6, it is characterized in that, disregarding generator unit stator during the Modeling Calculation
Influence of the winding capacitance to earth to the relational expression.
8. the method according to claim 1, wherein the relational expression are as follows:
Wherein, V64sFor low frequency injecting voltage；I64sFor low frequency Injection Current；Rs is that generator neutral point ground connection becomes road equivalent string again
Join resistance；Rp is that the change neutral ground of high factory becomes road equivalent parallel resistance again；θ is voltage and electric current angle before phase compensation；
For phase compensation angle；1/Rp corresponds to the parallel resistance compensating parameter in the protective device；Rs is corresponded in the protective device
Series resistance compensation parameter；Angle compensation parameter in the corresponding protective device；Rf is the event of generator unit stator single-phase earthing
Hinder transition resistance, the ground insulation resistance of the as described injection type power generator stator ground fault protection system.
9. the method according to claim 1, wherein the injection type power generator stator ground fault protection system includes
Adjustable rheostat, generator neutral point ground connection become secondary load resistance, divider, generator neutral point grounding transformer, electric current
Verification of Measuring Current Transformer, bandpass filter, low-frequency signal injection source and protective device；Generator neutral point ground terminal respectively with
The adjustable rheostatic first end, the generator neutral point grounding transformer armature winding first end connection；It is described
Adjustable rheostatic second end, the second end of armature winding of the generator neutral point grounding transformer are grounded；The hair
The first end of the secondary windings of generator neutral point grounding transformer is grounded with the generator neutral point respectively becomes secondary load electricity
The first end of resistance, the first end of the divider, the connection of the second end of the bandpass filter；The first of the bandpass filter
End is connect with the first end in the low-frequency signal injection source；The second end in the low-frequency signal injection source respectively with the generator
The second end, the second end of the divider, the generator neutral point that neutral ground becomes secondary load resistance are grounded transformation
The second end of the secondary windings of device connects, and is grounded；The second end and sliding end of the divider are as the protective device
Low-frequency voltage acquires input terminal；The current transformer is for acquiring low-frequency current and it being transferred to the low of the protective device
Frequency current acquisition input terminal.
10. the method according to claim 1, wherein the equivalent circuit includes generator unit stator single-phase earthing
Fault resistance, the change neutral ground of high factory become road equivalent parallel resistance again, generator neutral point ground connection becomes road equivalent string again
Join resistance, generator unit stator winding equivalent capacitive reactance and phase compensation block over the ground；The first end of low frequency injecting voltage respectively with
The generator stator single-phase earthing fault transition resistance, the high factory become that neutral ground becomes road equivalent parallel resistance again
One end, the generator unit stator winding over the ground equivalent capacitive reactance first end connection；The second end of low frequency injecting voltage and the phase
The input terminal connection of position compensating module；The output end of the phase compensation block becomes again with generator neutral point ground connection respectively
The second end of road equivalent series resistance, the generator unit stator winding over the ground equivalent capacitive reactance second end connection；The generator
The first end that neutral ground becomes road equivalent series resistance again is electric with the generator stator single-phase earthing fault transition respectively
Resistance, high factory become the second end connection that neutral ground becomes road equivalent parallel resistance again.
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