CN105044528A - Nuclear power plant generator injection type stator grounding protection dynamic test method and device - Google Patents
Nuclear power plant generator injection type stator grounding protection dynamic test method and device Download PDFInfo
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Abstract
The invention discloses a nuclear power plant generator injection type stator grounding protection dynamic test method and device. With the method and device adopted, the technical problem of high risk of an existing conventional dynamic test can be solved. The dynamic test method includes the following steps that: S1, a stator grounding protection device exits under control so as to be not used; S2, a resistance value-adjustable test resistor is connected between the neutral point of the stator winding of a generator and ground before excitation boosting when the generator is a no-load state, and the grounding of the stator winding is simulated; S3, the stator grounding protection device is put into use under control, and excitation boosting achieves preset voltage under control, and maintains stable operation; and S4, measuring resistor sampling testing is carried out through the stator grounding protection device, and the protection parameters of the stator grounding protection device can be adjusted based on sampling testing results, and therefore, sampling accuracy can assuredly satisfy preset requirements, and detection and correction of the protective performance of the stator grounding protection device can be realized. With the method and device adopted, test risks such as electric shock of testers, false grounding of operating equipment and inaccurate measurement of the test resistor can be avoided.
Description
Technical field
The present invention relates to nuclear power plant's generator protection for earthing technical field, particularly relate to a kind of nuclear power plant generator injected type stator ground protection dynamic test method and device.
Background technology
Generator is the important standby power supply apparatus of nuclear power plant, and nuclear power plant's generator protection for earthing mode has multiple, and wherein, generator injected type stator ground protection is a kind of protected mode that nuclear power plant commonly uses.Due to when generator unit stator winding does not have ground connection, generator unit stator winding is pure capacitive reactance over the ground, and when generator stator winding single-phase earthing, generator unit stator winding is not pure capacitive reactance over the ground and there is the resistance to earth of a certain size (as 0 ~ 10k).
Nuclear power plant's generator injected type stator ground protection, based on this principle, injects low-frequency power by generator neutral point grounding transformer to generator unit stator winding, utilizes node-pair method accurately to calculate generator unit stator winding earth impedance; When generator generation stator single-phase grounding fault, the voltage and current angle of Injection Signal can change, and according to generator unit stator winding capacitance to earth, calculates stator winding resistance to earth, judges whether generator grounding of stator winding fault occurs.
There is certain error in generator stationary state (being namely in zero rotary regimes) and equipment capacitive reactance under dynamically (being namely in rated speed, excitation drops into state), measuring resistance (resistance to earth namely measured); namely may occur that the unequal or difference of the actual resistance to earth of the resistance to earth of generator injected type stator ground protection measurement device and generator unit stator winding exceedes reasonable error scope, and cannot judge whether generator grounding of stator winding fault occurs exactly.Therefore, need to detect generator injected type stator ground protection parameter and correct, the actual resistance to earth difference of the resistance to earth measured to make it and generator unit stator winding belongs to reasonable error, to guarantee the reliability of injected type stator ground protection.
In actual applications, in order to ensure the reliability of injected type stator ground protection, except needs carry out stator ground fault protection test under generator stationary state, also need to carry out the error measure that generator dynamically descends actual stake resistance and measuring resistance, Measurement accuracy generator unit stator winding and associated devices (generator, neutral grounded transformer, exciting transformer, Generator end PT etc.) capacitance to earth, consider to reduce the measuring error under two kinds of operating modes (i.e. generator static and generator is dynamic), stator winding insulation situation is reacted more accurately to make protective device, guarantee to protect reliable input.Wherein, generator dynamically under stator ground fault protection test difficulty larger.
At present; the conventional dynamic test method of nuclear power plant's generator injected type stator ground protection is: first; generator zero load is boosted to 40% rated voltage; in generator neutral point grounding transformer high-pressure side; manually high-power resistor box is accessed between generator unit stator winding and ground by testing crew; the resistance of adjusting resistance case is to setting valve again, simulation generator stator winding single-phase earthing fault alarm, tripping operation, thus carries out stator ground fault protection demonstration test.
By analysis, above-mentioned conventional dynamic test method has some limitations in operating process at the scene, and the impact person, device security, be mainly manifested in the following aspects:
(1) this test need be carried out after generator boosting, need testing crew hand-held insulation rod access generator high-tension apparatus, though insulation rod can ensure that human body does not contact high pressure, but have that insulation rod damages, maloperation makes high-tension apparatus touch grounding shell, insulation rod contact unreliablely makes the fortuitous events such as contact resistance increase, when these fortuitous events occur, testing crew electric shock, operational outfit misconnection ground, test resistance can be caused to measure inaccurate equivalent risk, and empirical risk is higher;
(2) need testing crew manual adjusting resistance case resistance, increase testing crew electric shock risk;
(3) test resistance is connected in generator unit stator winding, if there is real earth fault in generator unit stator winding in process of the test, generator unit stator winding two points ground fault will be there is, main electrical equipment and testing equipment can be damaged, and do not adopt an effective measure in prior art and avoid this type of situation to occur;
(4) because injected type stator ground protection Tuning curve is nonlinearities change, conventional test is only carried out reporting to the police, the demonstration test of trip rating, and measuring resistance sampled point is less, truly can not reflect protection error change situation.
Summary of the invention
The present invention is directed to the nuclear power plant's generator unit stator winding earth existed in prior art and protect the technical matters that conventional dynamic test risk is high; provide a kind of nuclear power plant generator injected type stator ground protection dynamic test method and device, achieve and avoid or reduce the technique effect that testing crew gets an electric shock, operational outfit misconnection ground, test resistance measure the empirical risk such as inaccurate.
On the one hand, embodiments provide a kind of nuclear power plant generator injected type stator ground protection dynamic test method, described dynamic test method comprises the following steps:
S1, control nuclear power plant generator injected type stator ground protection device exit use;
S2, when described generator is in light condition, and before described generator excitation boosting, between described generator unit stator winding neutral point and ground, access the adjustable test resistance of resistance, by the resistance of Adjustment Tests resistance, simulate described generator unit stator winding earth;
S3, control described injected type stator ground protection device and come into operation, control described generator excitation and boost to predeterminated voltage, and keep described generator stable operation; Wherein, described predeterminated voltage is lower than the rated voltage of described generator;
S4, to be carried out measuring resistance sampling test by described injected type stator ground protection device; and the Protection parameters of described injected type stator ground protection device is adjusted based on sampling test result; to guarantee that sampling precision meets preset requirement, thus the detection realized the protective value of described injected type stator ground protection device and correction.
Optionally, described step S4 specifically comprises sub-step:
S41, to be carried out measuring resistance sampling test by described injected type stator ground protection device, the stake resistance of described stator winding is sampled, to obtain sampling resistor value;
S42, resistance based on described sampling resistor value and described test resistance; adjust the Protection parameters of described injected type stator ground protection device; to guarantee that sampling precision meets preset requirement, thus the detection realized the protective value of described injected type stator ground protection device and correction.
Optionally, described step S3 specifically comprises sub-step:
S31, control described injected type stator ground protection device and come into operation, and check that whether the stake resistance sampling functions of described injected type stator ground protection device is normal;
S32, when the stake resistance sampling functions of described injected type stator ground protection device is normal, controls described generator excitation and boost to described predeterminated voltage, and keep described generator stable operation.
Optionally, before described step S2, described dynamic test method also comprises:
The excitation system controlling described generator comes into operation; and control described generator zero load and boost to rated voltage; and check the stake resistance sampling functions of described injected type stator ground protection device and warning function whether normal; when check result shows the stake resistance sampling functions of described injected type stator ground protection device and warning function is all normal, control described generator inversion field suppression.
Optionally, after described step S4, described dynamic test method also comprises step:
S5, control described generator inversion field suppression, and control described injected type stator ground protection device and exit use, and successively adjust the resistance of described test resistance degressively, and after each adjustment, re-start described measuring resistance sampling test.
Optionally, described dynamic test method also comprises step:
Before described generator excitation boosting; revise the protection definite value of the first-harmonic stator ground fault protection device of described generator, to guarantee during generator injected type stator ground protection dynamic test, and when Stator ground fault appears in main electrical equipment; timely excision fault, protection main electrical equipment safety.
Optionally, before described step S2, described dynamic test method also comprises:
Based on generator neutral point residual voltage; the minimum value of analogue ground resistance; the scope of generator first-harmonic stator ground fault protection unit protection stator winding; and the safety factor of described injected type stator ground protection device; calculate the rated current of test resistance, and based on described rated current Selection experiment resistance.
Optionally, described test resistance is the form formation of multiple fixed resistance value resistant series combination; Wherein, the form by adjusting described tandem compound adjusts the resistance of described test resistance.
Optionally, before described step S2, described dynamic test method also comprises: between described test resistance and described generator unit stator winding neutral point, series connection insurance fuse, with there is real grounding of stator winding fault at described generator and the electric current flowing through described test resistance is greater than the fusing current of described fuse time, the stake resistance of the described stator winding of excision fast.
On the other hand, the embodiment of the present invention additionally provides a kind of nuclear power plant generator injected type stator ground protection dynamic testing equipment, comprising:
First control module, exit use for controlling nuclear power plant's generator injected type stator ground protection device, the excitation system simultaneously controlling described generator comes into operation;
Analogue ground module, for when described generator is in light condition, and before the boosting of described generator excitation, between described generator unit stator winding neutral point and ground, access the adjustable test resistance of resistance, by the resistance of Adjustment Tests resistance, simulate described generator unit stator winding earth;
Second control module, coming into operation for controlling described injected type stator ground protection device, controlling described generator excitation and boosting to predeterminated voltage, and keeping described generator stable operation; Wherein, described predeterminated voltage is lower than the rated voltage of described generator;
Measuring resistance sampling test module; for being carried out measuring resistance sampling test by described injected type stator ground protection device; and the Protection parameters of described injected type stator ground protection device is adjusted based on sampling test result; to guarantee that sampling precision meets preset requirement, thus the detection realized the protective value of described injected type stator ground protection device and correction.
Optionally, described measuring resistance sampling test module comprises:
Sampling resistor value acquiring unit, for being carried out measuring resistance sampling test by described injected type stator ground protection device, is sampled to the stake resistance of described stator winding, to obtain sampling resistor value;
Protection parameters adjustment unit; for the resistance based on described sampling resistor value and described test resistance; adjust the Protection parameters of described injected type stator ground protection device; to guarantee that sampling precision meets preset requirement, thus the detection realized the protective value of described injected type stator ground protection device and correction.
Optionally, described second control module comprises:
Protective device input control unit, comes into operation for controlling described injected type stator ground protection device, and checks that whether the stake resistance sampling functions of described injected type stator ground protection device is normal;
Boosting rectifier control unit, for when the stake resistance sampling functions of described injected type stator ground protection device is normal, controls described generator excitation and boosts to described predeterminated voltage, and keep described generator stable operation.
Optionally, described dynamic testing equipment also comprises:
Protective device functional check module; excitation system for controlling described generator comes into operation; and control described generator zero load and boost to rated voltage; and check the stake resistance sampling functions of described injected type stator ground protection device and warning function whether normal; when check result shows the stake resistance sampling functions of described injected type stator ground protection device and warning function is all normal, control described generator inversion field suppression.
Optionally, described dynamic testing equipment also comprises:
3rd control module; after carrying out measuring resistance sampling test at described measuring resistance sampling test module by described injected type stator ground protection device; control described generator inversion field suppression; and control described injected type stator ground protection device and exit use; and successively adjust the resistance of described test resistance degressively; and after each adjustment, re-start described measuring resistance sampling test.
Optionally, described dynamic testing equipment also comprises:
Protection fixed value modification module; for before described generator excitation boosting; revise the protection definite value of the first-harmonic stator ground fault protection device of described generator; to guarantee during generator injected type stator ground protection dynamic test; and when there is Stator ground fault in main electrical equipment; timely excision fault, protection main electrical equipment safety.
Optionally, described dynamic testing equipment also comprises:
Test resistance selects module; for before generator unit stator winding earth described in described analogue ground module simulation; based on generator neutral point residual voltage; the minimum value of analogue ground resistance; the scope of generator first-harmonic stator ground fault protection unit protection stator winding; and the safety factor of described injected type stator ground protection device, calculate the rated current of test resistance, and based on described rated current Selection experiment resistance.
Optionally, described test resistance is the form formation of multiple fixed resistance value resistant series combination; Wherein, the form by adjusting described tandem compound adjusts the resistance of described test resistance.
Optionally, described dynamic testing equipment also comprises:
Fuse protected module; for before generator unit stator winding earth described in described analogue ground module simulation; between described test resistance and described generator unit stator winding neutral point; series connection insurance fuse; with there is real grounding of stator winding fault at described generator and the electric current flowing through described test resistance is greater than the fusing current of described fuse time, the stake resistance of the described stator winding of excision fast.
One or more technical scheme provided by the invention, at least has following technique effect or advantage:
Due in the present invention, when carrying out nuclear power plant's generator injected type stator ground protection dynamic test, first, control generator injected type stator ground protection device and exit use; Then, when described generator is in light condition, and before the boosting of described generator excitation, between described generator unit stator winding neutral point and ground, access the adjustable test resistance of resistance, by the resistance of Adjustment Tests resistance, simulate described generator unit stator winding earth; Afterwards, control described injected type stator ground protection device and come into operation, control described generator excitation and boost to predeterminated voltage lower than rated voltage, and keep described generator stable operation; Finally; measuring resistance sampling test is carried out by described injected type stator ground protection device; and the Protection parameters of described injected type stator ground protection device is adjusted based on sampling test result; to guarantee that sampling precision meets preset requirement, thus the detection realized the protective value of described injected type stator ground protection device and correction.That is, start with from the access way of test resistance, under the prerequisite taking into full account testing crew safety, by changing test resistance access way, namely at generator light condition, access test resistance before excitation boosting, simulation generator stator ground, and then carry out excitation boosting, carry out the protection test of injected type stator ground protection device, efficiently solve prior art center power generator grounding of stator winding and protect the technical matters that conventional dynamic test risk is high, achieve and avoid or reduce testing crew electric shock, operational outfit misconnection ground, test resistance measures the inaccurate technique effect waiting empirical risk.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The first nuclear power plant's generator injected type stator ground protection dynamic test method process flow diagram that Fig. 1 provides for the embodiment of the present invention;
The second nuclear power plant generator injected type stator ground protection dynamic test method process flow diagram that Fig. 2 provides for the embodiment of the present invention;
The third nuclear power plant's generator injected type stator ground protection dynamic test method process flow diagram that Fig. 3 provides for the embodiment of the present invention;
The 4th kind of nuclear power plant's generator injected type stator ground protection dynamic test method process flow diagram that Fig. 4 provides for the embodiment of the present invention;
Multiple fixed resistance value resistant series unitized construction schematic diagram that Fig. 5 provides for the embodiment of the present invention;
The first nuclear power plant's generator injected type stator ground protection dynamic testing equipment structural representation that Fig. 6 A provides for the embodiment of the present invention;
The second nuclear power plant generator injected type stator ground protection dynamic testing equipment structural representation that Fig. 6 B provides for the embodiment of the present invention.
Embodiment
The embodiment of the present invention is by providing a kind of nuclear power plant generator injected type stator ground protection dynamic test method; solve nuclear power plant's generator unit stator winding earth and protect the technical matters that conventional dynamic test risk is high, achieve and avoid or reduce the technique effect that testing crew gets an electric shock, operational outfit misconnection ground, test resistance measure the empirical risk such as inaccurate.
The technical scheme of the embodiment of the present invention is for solving the problems of the technologies described above, and general thought is as follows:
Embodiments provide a kind of nuclear power plant generator injected type stator ground protection dynamic test method, described dynamic test method comprises the following steps: S1, control nuclear power plant generator injected type stator ground protection device exit use; S2, when described generator is in light condition, and before described generator excitation boosting, between described generator unit stator winding neutral point and ground, access the adjustable test resistance of resistance, by the resistance of Adjustment Tests resistance, simulate described generator unit stator winding earth; S3, control described injected type stator ground protection device and come into operation, control described generator excitation and boost to predeterminated voltage, and keep described generator stable operation; Wherein, described predeterminated voltage is lower than the rated voltage of described generator; S4, to be carried out measuring resistance sampling test by described injected type stator ground protection device; and the Protection parameters of described injected type stator ground protection device is adjusted based on sampling test result; to guarantee that sampling precision meets preset requirement, thus the detection realized the protective value of described injected type stator ground protection device and correction.
Visible, in embodiments of the present invention, start with from the access way of test resistance, under the prerequisite taking into full account testing crew safety, by changing test resistance access way, namely at generator light condition, access test resistance before excitation boosting, simulation generator stator ground, and then carry out excitation boosting, carry out the protection test of injected type stator ground protection device, efficiently solve prior art center power generator grounding of stator winding and protect the technical matters that conventional dynamic test risk is high, achieve and avoid or reduce testing crew electric shock, operational outfit misconnection ground, test resistance measures the inaccurate technique effect waiting empirical risk.
In order to better understand technique scheme, below in conjunction with Figure of description and concrete embodiment, technique scheme is described in detail, the specific features being to be understood that in the embodiment of the present invention and embodiment is the detailed description to technical scheme, instead of the restriction to technical scheme, when not conflicting, the technical characteristic in the embodiment of the present invention and embodiment can combine mutually.
In a kind of embodiment of the application, propose a kind of nuclear power plant generator injected type stator ground protection dynamic test method, which show a kind of test resistance secure accessing scheme, please refer to Fig. 1, described dynamic test method comprises the following steps:
S1, control nuclear power plant generator injected type stator ground protection device exit use;
S2, when described generator is in light condition, and before described generator excitation boosting, between described generator unit stator winding neutral point and ground, access the adjustable test resistance of resistance, by the resistance of Adjustment Tests resistance, simulate described generator unit stator winding earth;
S3, control described injected type stator ground protection device and come into operation, control described generator excitation and boost to predeterminated voltage, and keep described generator stable operation; Wherein, described predeterminated voltage is lower than the rated voltage (Ue) of described generator, and if value is 40%Ue, according to the different model of generator, its rated voltage is different, is not specifically limited here;
S4, to be carried out measuring resistance sampling test by described injected type stator ground protection device; and the Protection parameters of described injected type stator ground protection device is adjusted based on sampling test result; to guarantee that sampling precision meets preset requirement, thus the detection realized the protective value of described injected type stator ground protection device and correction.
In specific implementation process, in order to ensure in the normal situation of the various functions of generator injected type stator ground protection device, carry out generator injected type stator ground protection dynamic test, after execution above-mentioned steps S1, and before execution above-mentioned steps S2, described dynamic test method also comprises: the excitation system controlling described generator comes into operation, and control described generator zero load and boost to rated voltage, and check the stake resistance sampling functions of described injected type stator ground protection device and warning function whether normal, when check result shows the stake resistance sampling functions of described injected type stator ground protection device and warning function is all normal, control described generator inversion field suppression.Certainly; while whether the described injected type stator ground protection device of inspection is abnormal; also can detect miscellaneous equipment (as generator neutral point grounding transformer, exciting transformer, Generator end PT etc.) has without exception; when described injected type stator ground protection device and miscellaneous equipment are all normal; inversion field suppression; and perform step S2, when described injected type stator ground protection device or miscellaneous equipment exception, then need warping apparatus adjustment or keep in repair to normal.
For above-mentioned steps S2: specifically, before generator rated speed is run and before the boosting of generator excited system excitation, preparation test resistance, adopts two sufficient lengths and is not less than 16mm
2high-tension shielding cable, one end of test resistance is connected to generator unit stator winding neutral point place by a wherein high-tension shielding cable, and the other end of test resistance is by wherein another root high-tension shielding cable grounding.The resistance of Adjustment Tests resistance, simulates described generator unit stator winding earth.
In specific implementation process, in order to guarantee that carry out generator injected type stator ground protection dynamic test, please refer to Fig. 2, above-mentioned steps S3 comprises sub-step in the normally functioning situation of the resistance sampling of generator injected type stator ground protection device further:
S31, control described injected type stator ground protection device and come into operation, and check that whether the stake resistance sampling functions of described injected type stator ground protection device is normal;
S32, when the stake resistance sampling functions of described injected type stator ground protection device is normal, controls described generator excitation and boost to described predeterminated voltage (i.e. 40%Ue), and keep described generator stable operation.
Further, please refer to Fig. 3, described step S4 comprises sub-step:
S41, to be carried out measuring resistance sampling test by described injected type stator ground protection device, the stake resistance of described stator winding is sampled, to obtain sampling resistor value;
S42, resistance based on described sampling resistor value and described test resistance; adjust the Protection parameters of described injected type stator ground protection device; to guarantee that sampling precision meets preset requirement, thus the detection realized the protective value of described injected type stator ground protection device and correction.
Specifically, the resistance of described test resistance is known, after sampling obtains described sampling resistor value, the resistance of described test resistance and the difference of described sampling resistor value can be calculated, this difference be not more than preset value (as described in test resistance resistance 5%) time, determine that described sampling precision meets preset requirement; Relative; when this difference is greater than this preset value; guarantee that sampling precision does not meet preset requirement; now need to adjust described injected type stator ground protection device Protection parameters (as described in the parameter such as related resistors, reactance of injected type stator ground protection device), be not more than described preset value with the difference of the resistance making described sampling resistor value and described test resistance.
In specific implementation process; in order to by test of many times, repeatedly adjust Protection parameters; so that the sampling precision of described injected type stator ground protection device is adjusted to optimum level; please refer to Fig. 4; after described step S4; described dynamic test method also comprises step: S5, control described generator inversion field suppression; and control described injected type stator ground protection device and exit use; and successively adjust the resistance of described test resistance degressively; and after each adjustment, re-start described measuring resistance sampling test.Wherein, after carrying out measuring resistance sampling test each time, all according to parameters such as measurement result Reasonable adjustment resistance, reactance, guarantee that test findings meets the demands.
In a word, above-mentioned before the boosting of nuclear power plant genset access test resistance, achieve the Secure isolation of testing crew and high voltage alive equipment, avoid the empirical risks such as testing crew electric shock, maloperation, very big raising experimental safe coefficient; And sampled by test resistance multimetering, improve protection reliability.
Generator stator ground protective device is except injected type stator ground protection device, also comprise first-harmonic stator ground fault protection device (or other), in the another kind of embodiment of the application, in order at duration of test, when there is Stator ground fault in main electrical equipment, timely excision is to prevent failure propagation, avoid occurring that testing equipment fault is damaged simultaneously, above-mentioned dynamic test method also comprises: before described generator excitation boosting, revise the protection definite value of the first-harmonic stator ground fault protection device of described generator, to guarantee during generator injected type stator ground protection dynamic test, and when there is Stator ground fault in main electrical equipment, timely excision fault, protection main electrical equipment safety.
Concrete, first-harmonic stator ground fault protection device protects main electrical equipment safety according to protection definite value inventory, and such as, generator first-harmonic stator ground fault protection fixed value adjusting is: zero-sequence fundamental voltage definite value is 5V, zero-sequence fundamental voltage high-set setting is 11.5V, and zero-sequence fundamental voltage protection time delay is 0.5s, wherein, first-harmonic stator ground fault protection device utilizes 5V zero-sequence fundamental voltage definite value and 11.5V zero-sequence fundamental voltage high-set setting, as the standard detecting generator voltage quality of balance, when first-harmonic stator ground fault protection device detects generator stator ground fault, starting protection is carried out with the operating time of protection of 0.5s, in the present embodiment, before generator excitation boosting, generator first-harmonic stator ground fault protection is revised as minimum value 0s by 0.5s actuation time, if there is generator stator ground fault in process of the test, tripping field switch immediately, inversion field suppression, guarantee gen-set safety.
Access test resistance before adopting generator boosting, in process of the test, the long-time connecting system of test resistance, comparatively large on the impact of main electrical equipment and test resistance, in order to avoid reducing testing equipment infringement, choose reasonable test resistance is very necessary.Namely before described step S2; described dynamic test method also comprises: based on generator neutral point residual voltage; the minimum value of analogue ground resistance; the scope of generator first-harmonic stator ground fault protection unit protection stator winding; and the safety factor of described injected type stator ground protection device; calculate the rated current of test resistance, and based on described rated current Selection experiment resistance.
Concrete, in process of the test, flow through the electric current I of test resistance
ras shown in formula (1):
Wherein, U
n0for generator neutral point residual voltage, R
efor test resistance.In specific implementation process, need to get generator neutral point residual voltage maximal value U
n0maxwith test resistance minimum value R
emincalculate the maximum current I flowing through test resistance
rmax, get
R
Emin＝R
zd：
For certain nuclear power plant's generator 's parameter, generator outlet voltage is 24kV electric pressure, and test access minimum resistance is 0.5k Ω, considers that in process of the test, the most serious stator winding faults situation occurs generator, i.e. Generator end generation stator single-phase grounding fault, U
n0maxvalue
r
zdvalue 0.3k Ω, according to formula (2), then the known maximum current flowing through test resistance is:
Consider generator first-harmonic stator ground fault protection protection stator winding 85% scope (as have in 100 stator winding 85 protected); injected type stator ground protection has been coordinated to test; therefore; (metering surplus is considered by generator unit stator winding 20%; the value that choosing is herein greater than 15%) scope is as grounding of stator winding calculation of fault; getting COEFFICIENT K is 0.2, calculates test resistance rated current I
0.2:
I
0.2=KI
rmax=0.2I
rmax=0.2 × 8.31A=1.62A formula (4)
Consider test resistance ability to bear and relaying configuration in short-term, get safety factor K
kELbe 1.2, then the rated current I of known Selection experiment resistance
efor:
I
e=1.2I
0.2=1.2 × 1.62=1.944A formula (5)
Therefore, according to theory calculate, selection rated current is that the resistance of 2A carries out injected type stator ground protection dynamic test; Consider that test resistance needs, in access generator primary equipment, to calculate by the single-phase rated voltage of generator, selection electric pressure is the Wound-rotor type resistance of 20kV.
For the test resistance case adopted in process of the test in prior art, its current capacity cannot reach 2A, therefore measuring resistance sampled point is few, in the application's scheme, in order to increase measuring resistance sampling number and facilitate site test, by being formed described test resistance with the form of multiple fixed resistance value resistant series combination, and by adjusting the form of described tandem compound, adjustment is connected on the quantity of the fixed resistance value resistance between generator windings neutral point and ground, to adjust the resistance of described test resistance; Wherein, the resistance of described multiple fixed resistance value resistance can not be identical.Concrete, according to injected type stator ground protection feature, the accurate sample range of protector measuring resistance is 0 ~ 15k Ω; the fixed resistance of different resistance such as buying 0.5k Ω, 1k Ω, 2k Ω etc.; according to test needs, series wiring combination before test, stake resistance resistance requirement during satisfied test.As shown in Figure 5, for one multiple fixed resistance value resistant series combination schematic diagram, multiple fixed resistance value resistance 51 connects according to certain connection mode, and arrange on the line of every two resistance coupling 52, need the joint selecting to be applicable to be connected with generator windings neutral point and ground to facilitate testing crew according to test resistance resistance.Wherein, the wiring of multiple fixed resistance value resistant series can meet test 0.5 ~ 15k Ω sampling resistor size requirements.
In addition, in specific implementation process, before described step S2, described dynamic test method also comprises: between described test resistance and described generator unit stator winding neutral point, series connection insurance fuse, with there is real grounding of stator winding fault at described generator and the electric current flowing through described test resistance is greater than the fusing current of described fuse time, the stake resistance of the described stator winding of excision fast, prevent from damaging described test resistance, and proterctive equipment safety; Wherein, can choose and allow the maximum current that passes through to be the insurance fuse of 2A.
Generally speaking, the application's scheme is started with from test resistance access way, proposes the generator injected type stator ground protection dynamic test method that a kind of nuclear power plant is novel, has higher security, operability:
(1) access test resistance before generator boosting, avoids the operation that testing crew directly accesses test resistance, simulation generator unit stator winding earth fault in the charged situation of generator primary equipment, drastically increases personnel, device security;
(2) choose reasonable test resistance, with the required test resistance of multiple fixed resistance value resistant series combinations, flexible operation, does not need to carry out test resistance regulation & test wiring change online, improves experimental safe;
(3) supportive test resistance multimetering, optimizes Protection parameters, improves protection reliability;
(4) adopt multiple protection cooperation measure, guarantee main electrical equipment and testing equipment safety, reduce experimental safe risk to greatest extent.
It is to be noted; the debugging field of generator injected type stator ground protection dynamic test during this testing program can be applicable to nuclear power plant's complete start-up test; also can be applicable to the maintenance demonstration test of generator injected type stator ground protection dynamic test between nuclear power plant's overhaul time, also can be applicable to the generator injected type stator ground protection dynamic test between the startup of the conventional power plant such as Large-scale fire-electricity unit or Hydropower Unit, overhaul time.This test method has been successfully applied in some nuclear power plant's major overhaul test, achieve good test effect, ensure that generator and power transmission protection system (GPA, GeneratorandPowerTransmissionProtection) the reliable input protected, be in particular in: avoid testing crew and access test resistance when a high voltage alive equipment, greatly improve experimental safe coefficient; New test method takes multinomial safeguard measure, guarantees main electrical equipment safe operation, avoids destructive test equipment; Improving resistance access by adopting, selecting the measures such as resistance; carrying out generator dynamically descends the multimetering of grounding of stator winding resistance to sample; under analysis generator different conditions; the variation tendency of injected type stator ground protection resistance; and generator speed, voltage on the impact of stake resistance, for follow-up unit operation, maintenance, fault analysis provide the most full and accurate reference frame.After this, this testing program also will be applied in more stator ground fault protection dynamic test.
Based on same inventive concept, please refer to Fig. 6 A, the embodiment of the present invention additionally provides a kind of nuclear power plant generator injected type stator ground protection dynamic testing equipment, comprising:
First control module 61, exit use for controlling nuclear power plant's generator injected type stator ground protection device, the excitation system simultaneously controlling described generator comes into operation;
Analogue ground module 62, for when described generator is in light condition, and before the boosting of described generator excitation, between described generator unit stator winding neutral point and ground, access the adjustable test resistance of resistance, by the resistance of Adjustment Tests resistance, simulate described generator unit stator winding earth;
Second control module 63, coming into operation for controlling described injected type stator ground protection device, controlling described generator excitation and boosting to predeterminated voltage, and keeping described generator stable operation; Wherein, described predeterminated voltage is lower than the rated voltage of described generator;
Measuring resistance sampling test module 64; for being carried out measuring resistance sampling test by described injected type stator ground protection device; and the Protection parameters of described injected type stator ground protection device is adjusted based on sampling test result; to guarantee that sampling precision meets preset requirement, thus the detection realized the protective value of described injected type stator ground protection device and correction.
Concrete, please refer to Fig. 6 B, described measuring resistance sampling test module 64 comprises:
Sampling resistor value acquiring unit 641, for being carried out measuring resistance sampling test by described injected type stator ground protection device, is sampled to the stake resistance of described stator winding, to obtain sampling resistor value;
Protection parameters adjustment unit 642; for the resistance based on described sampling resistor value and described test resistance; adjust the Protection parameters of described injected type stator ground protection device; to guarantee that sampling precision meets preset requirement, thus the detection realized the protective value of described injected type stator ground protection device and correction.
In specific implementation process, please refer to Fig. 6 B, described second control module 63 comprises:
Protective device input control unit 631, comes into operation for controlling described injected type stator ground protection device, and checks that whether the stake resistance sampling functions of described injected type stator ground protection device is normal;
Boosting rectifier control unit 632, for when the stake resistance sampling functions of described injected type stator ground protection device is normal, controls described generator excitation and boosts to described predeterminated voltage, and keep described generator stable operation.
In specific implementation process, please refer to Fig. 6 B, described dynamic testing equipment also comprises:
Protective device functional check module 65; before simulating described generator unit stator winding earth in described analogue ground module 62; the excitation system controlling described generator comes into operation; and control described generator zero load and boost to rated voltage; and check the stake resistance sampling functions of described injected type stator ground protection device and warning function whether normal; when check result shows the stake resistance sampling functions of described injected type stator ground protection device and warning function is all normal, control described generator inversion field suppression.
In specific implementation process, please refer to Fig. 6 B, described dynamic testing equipment also comprises:
3rd control module 66; after carrying out measuring resistance sampling test at described measuring resistance sampling test module 64 by described injected type stator ground protection device; control described generator inversion field suppression; and control described injected type stator ground protection device and exit use; and successively adjust the resistance of described test resistance degressively; and after each adjustment, re-start described measuring resistance sampling test.
In specific implementation process, please refer to Fig. 6 B, described dynamic testing equipment also comprises:
Protection fixed value modification module 67; for before described generator excitation boosting; revise the protection definite value of the first-harmonic stator ground fault protection device of described generator; to guarantee during generator injected type stator ground protection dynamic test; and when there is Stator ground fault in main electrical equipment; timely excision fault, protection main electrical equipment safety.
In specific implementation process, please refer to Fig. 6 B, described dynamic testing equipment also comprises:
Test resistance selects module 68; before simulating described generator unit stator winding earth in described analogue ground module 62; based on generator neutral point residual voltage; the minimum value of analogue ground resistance; the scope of generator first-harmonic stator ground fault protection unit protection stator winding; and the safety factor of described injected type stator ground protection device, calculate the rated current of test resistance, and based on described rated current Selection experiment resistance.Concrete, described test resistance is that the form of multiple fixed resistance value resistant series combination is formed; Wherein, the form by adjusting described tandem compound adjusts the resistance of described test resistance.
In specific implementation process, please refer to Fig. 6 B, described dynamic testing equipment also comprises:
Fuse protected module 69; before simulating described generator unit stator winding earth in described analogue ground module 62; between described test resistance and described generator unit stator winding neutral point; series connection insurance fuse; with there is real grounding of stator winding fault at described generator and the electric current flowing through described test resistance is greater than the fusing current of described fuse time, the stake resistance of the described stator winding of excision fast.
According to description above; above-mentioned nuclear power plant generator injected type stator ground protection dynamic testing equipment is used for realizing above-mentioned nuclear power plant generator injected type stator ground protection dynamic test method; so; the course of work of this device is consistent with one or more embodiments of said method, has just repeated no longer one by one at this.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disk memory, CD-ROM, optical memory etc.) of computer usable program code.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (18)
1. nuclear power plant's generator injected type stator ground protection dynamic test method, is characterized in that, described dynamic test method comprises the following steps:
S1, control nuclear power plant generator injected type stator ground protection device exit use;
S2, when described generator is in light condition, and before described generator excitation boosting, between described generator unit stator winding neutral point and ground, access the adjustable test resistance of resistance, by the resistance of Adjustment Tests resistance, simulate described generator unit stator winding earth;
S3, control described injected type stator ground protection device and come into operation, control described generator excitation and boost to predeterminated voltage, and keep described generator stable operation; Wherein, described predeterminated voltage is lower than the rated voltage of described generator;
S4, to be carried out measuring resistance sampling test by described injected type stator ground protection device; and the Protection parameters of described injected type stator ground protection device is adjusted based on sampling test result; to guarantee that sampling precision meets preset requirement, thus the detection realized the protective value of described injected type stator ground protection device and correction.
2. nuclear power plant as claimed in claim 1 generator injected type stator ground protection dynamic test method, it is characterized in that, described step S4 specifically comprises sub-step:
S41, to be carried out measuring resistance sampling test by described injected type stator ground protection device, the stake resistance of described stator winding is sampled, to obtain sampling resistor value;
S42, resistance based on described sampling resistor value and described test resistance; adjust the Protection parameters of described injected type stator ground protection device; to guarantee that sampling precision meets preset requirement, thus the detection realized the protective value of described injected type stator ground protection device and correction.
3. nuclear power plant as claimed in claim 1 generator injected type stator ground protection dynamic test method, it is characterized in that, described step S3 specifically comprises sub-step:
S31, control described injected type stator ground protection device and come into operation, and check that whether the stake resistance sampling functions of described injected type stator ground protection device is normal;
S32, when the stake resistance sampling functions of described injected type stator ground protection device is normal, controls described generator excitation and boost to described predeterminated voltage, and keep described generator stable operation.
4. nuclear power plant as claimed in claim 1 generator injected type stator ground protection dynamic test method, it is characterized in that, before described step S2, described dynamic test method also comprises:
The excitation system controlling described generator comes into operation; and control described generator zero load and boost to rated voltage; and check the stake resistance sampling functions of described injected type stator ground protection device and warning function whether normal; when check result shows the stake resistance sampling functions of described injected type stator ground protection device and warning function is all normal, control described generator inversion field suppression.
5. nuclear power plant as claimed in claim 1 generator injected type stator ground protection dynamic test method, it is characterized in that, after described step S4, described dynamic test method also comprises step:
S5, control described generator inversion field suppression, and control described injected type stator ground protection device and exit use, and successively adjust the resistance of described test resistance degressively, and after each adjustment, re-start described measuring resistance sampling test.
6. nuclear power plant as claimed in claim 1 generator injected type stator ground protection dynamic test method, it is characterized in that, described dynamic test method also comprises step:
Before described generator excitation boosting; revise the protection definite value of the first-harmonic stator ground fault protection device of described generator, to guarantee during generator injected type stator ground protection dynamic test, and when Stator ground fault appears in main electrical equipment; timely excision fault, protection main electrical equipment safety.
7. nuclear power plant as claimed in claim 1 generator injected type stator ground protection dynamic test method, it is characterized in that, before described step S2, described dynamic test method also comprises:
Based on generator neutral point residual voltage; the minimum value of analogue ground resistance; the scope of generator first-harmonic stator ground fault protection unit protection stator winding; and the safety factor of described injected type stator ground protection device; calculate the rated current of test resistance, and based on described rated current Selection experiment resistance.
8. the nuclear power plant's generator injected type stator ground protection dynamic test method as described in claim as arbitrary in claim 1 ~ 7, is characterized in that, described test resistance is that the form of multiple fixed resistance value resistant series combination is formed; Wherein, the form by adjusting described tandem compound adjusts the resistance of described test resistance.
9. the nuclear power plant's generator injected type stator ground protection dynamic test method as described in claim as arbitrary in claim 1 ~ 7; it is characterized in that; before described step S2; described dynamic test method also comprises: between described test resistance and described generator unit stator winding neutral point; series connection insurance fuse; with there is real grounding of stator winding fault at described generator and the electric current flowing through described test resistance is greater than the fusing current of described fuse time, the stake resistance of the described stator winding of excision fast.
10. nuclear power plant's generator injected type stator ground protection dynamic testing equipment, is characterized in that, comprising:
First control module, exit use for controlling nuclear power plant's generator injected type stator ground protection device, the excitation system simultaneously controlling described generator comes into operation;
Analogue ground module, for when described generator is in light condition, and before the boosting of described generator excitation, between described generator unit stator winding neutral point and ground, access the adjustable test resistance of resistance, by the resistance of Adjustment Tests resistance, simulate described generator unit stator winding earth;
Second control module, coming into operation for controlling described injected type stator ground protection device, controlling described generator excitation and boosting to predeterminated voltage, and keeping described generator stable operation; Wherein, described predeterminated voltage is lower than the rated voltage of described generator;
Measuring resistance sampling test module; for being carried out measuring resistance sampling test by described injected type stator ground protection device; and the Protection parameters of described injected type stator ground protection device is adjusted based on sampling test result; to guarantee that sampling precision meets preset requirement, thus the detection realized the protective value of described injected type stator ground protection device and correction.
11. nuclear power plant as claimed in claim 10 generator injected type stator ground protection dynamic testing equipments, is characterized in that, described measuring resistance sampling test module comprises:
Sampling resistor value acquiring unit, for being carried out measuring resistance sampling test by described injected type stator ground protection device, is sampled to the stake resistance of described stator winding, to obtain sampling resistor value;
Protection parameters adjustment unit; for the resistance based on described sampling resistor value and described test resistance; adjust the Protection parameters of described injected type stator ground protection device; to guarantee that sampling precision meets preset requirement, thus the detection realized the protective value of described injected type stator ground protection device and correction.
12. nuclear power plant as claimed in claim 10 generator injected type stator ground protection dynamic testing equipments, it is characterized in that, described second control module comprises:
Protective device input control unit, comes into operation for controlling described injected type stator ground protection device, and checks that whether the stake resistance sampling functions of described injected type stator ground protection device is normal;
Boosting rectifier control unit, for when the stake resistance sampling functions of described injected type stator ground protection device is normal, controls described generator excitation and boosts to described predeterminated voltage, and keep described generator stable operation.
13. nuclear power plant as claimed in claim 10 generator injected type stator ground protection dynamic testing equipments, it is characterized in that, described dynamic testing equipment also comprises:
Protective device functional check module; for before generator unit stator winding earth described in described analogue ground module simulation; the excitation system controlling described generator comes into operation; and control described generator zero load and boost to rated voltage; and check the stake resistance sampling functions of described injected type stator ground protection device and warning function whether normal; when check result shows the stake resistance sampling functions of described injected type stator ground protection device and warning function is all normal, control described generator inversion field suppression.
14. nuclear power plant as claimed in claim 10 generator injected type stator ground protection dynamic testing equipments, it is characterized in that, described dynamic testing equipment also comprises:
3rd control module; after carrying out measuring resistance sampling test at described measuring resistance sampling test module by described injected type stator ground protection device; control described generator inversion field suppression; and control described injected type stator ground protection device and exit use; and successively adjust the resistance of described test resistance degressively; and after each adjustment, re-start described measuring resistance sampling test.
15. nuclear power plant as claimed in claim 10 generator injected type stator ground protection dynamic testing equipments, it is characterized in that, described dynamic testing equipment also comprises:
Protection fixed value modification module; for before described generator excitation boosting; revise the protection definite value of the first-harmonic stator ground fault protection device of described generator; to guarantee during generator injected type stator ground protection dynamic test; and when there is Stator ground fault in main electrical equipment; timely excision fault, protection main electrical equipment safety.
16. nuclear power plant as claimed in claim 10 generator injected type stator ground protection dynamic testing equipments, it is characterized in that, described dynamic testing equipment also comprises:
Test resistance selects module; for before generator unit stator winding earth described in described analogue ground module simulation; based on generator neutral point residual voltage; the minimum value of analogue ground resistance; the scope of generator first-harmonic stator ground fault protection unit protection stator winding; and the safety factor of described injected type stator ground protection device, calculate the rated current of test resistance, and based on described rated current Selection experiment resistance.
Nuclear power plant's generator injected type stator ground protection dynamic testing equipment as described in 17. claims as arbitrary in claim 10 ~ 16, is characterized in that, described test resistance is that the form of multiple fixed resistance value resistant series combination is formed; Wherein, the form by adjusting described tandem compound adjusts the resistance of described test resistance.
Nuclear power plant's generator injected type stator ground protection dynamic testing equipment as described in 18. claims as arbitrary in claim 10 ~ 16, it is characterized in that, described dynamic testing equipment also comprises:
Fuse protected module; for before generator unit stator winding earth described in described analogue ground module simulation; between described test resistance and described generator unit stator winding neutral point; series connection insurance fuse; with there is real grounding of stator winding fault at described generator and the electric current flowing through described test resistance is greater than the fusing current of described fuse time, the stake resistance of the described stator winding of excision fast.
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