CN111525511A - Generator and protection parameter setting method of circuit thereof - Google Patents
Generator and protection parameter setting method of circuit thereof Download PDFInfo
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- CN111525511A CN111525511A CN202010485192.5A CN202010485192A CN111525511A CN 111525511 A CN111525511 A CN 111525511A CN 202010485192 A CN202010485192 A CN 202010485192A CN 111525511 A CN111525511 A CN 111525511A
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- overcurrent protection
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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
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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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
Abstract
The application discloses a generator and a protection parameter setting method of a circuit thereof, which comprises the following steps: determining a set value and action time of the timing limit overcurrent protection at the side of the generator body according to the maximum allowable load current of the generator; respectively determining a set value and action time of direction overcurrent protection at the generator line side according to the set value and action time of timing limit overcurrent protection at the generator body side; the set value and the action time of the direction overcurrent protection at the generator line side are greater than those of the timing limit overcurrent protection at the generator body side; and respectively inputting each set value and the action time into the corresponding protection device. The method can avoid the condition that the superior line protection acts first to cause override trip when the generator is in overload operation. The application also discloses a generator and a protection parameter setting device, equipment and a computer readable storage medium of the generator circuit, and the generator and the protection parameter setting device and equipment have the technical effects.
Description
Technical Field
The application relates to the technical field of generators, in particular to a generator and a protection parameter setting method of a circuit thereof; the protection parameter setting device and equipment for the generator and the circuit thereof and a computer readable storage medium are also provided.
Background
According to the design specifications of relay protection and automatic devices of GB-T50062-2008 power devices, an interphase short-circuit protection device is arranged on a 3-10 kV line, and the following regulations are met: the double-side power supply circuit can be provided with directional or non-directional current quick-break and overcurrent protection. When the requirements of selectivity, sensitivity or quickness cannot be met by adopting directional or non-directional current quick-break and over-current protection, the optical fiber longitudinal differential protection is adopted as main protection, and the directional or non-directional over-current protection is arranged as backup protection. Overload protection should be installed to 3 ~ 10kV cable run. The protection means are preferably time-limited to act on the signal and may act as a trip when the safety of the device is compromised. According to the electric power design manual of iron and steel enterprises, over 1000kW of generators are provided with overcurrent protection of compound voltage starting, and the action current of a current element is set according to the rated current of the generator. Meanwhile, the overload protection of the stator winding is required to be arranged, and the stator winding acts on a signal in a time-limited mode.
The method is suitable for the specifications and the like, and at present, aiming at relay protection at the line side of a 25MW dry quenching generator and a 13MW TRT generator set, the method is provided with optical fiber longitudinal differential protection as main protection besides single-phase grounding protection, and is also provided with time-limited quick-break and overcurrent protection with direction as backup protection.
However, in recent years, the dry quenching generator and the TRT generator often have a trip in a grade-override manner, which is disadvantageous for quick fault judgment and processing. After each accident, the generator body, the cable lines and other equipment need to be comprehensively checked, the cable lines usually have no fault, and finally found fault points are all in a generator excitation system, such as exciter faults, excitation regulator faults and the like. When the generator is switched into phase operation after loss of magnetism, the later operation is unstable, the direction overcurrent protection of a generator grid-connected line finally caused by the sharp fluctuation of current and voltage acts first, and then the composite voltage overcurrent protection action of the generator body trips. Therefore, the method can not meet the requirement of selectivity in the relay protection quadruple, and brings inconvenience for troubleshooting, manpower waste, influence on quick recovery and increase of loss of generated energy.
In view of this, how to avoid the situation that the superior line protection first acts and the override trip occurs when the generator is running under overload has become a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide a generator and a protection parameter setting method of a circuit thereof, which can avoid the condition that the protection of a superior circuit acts first to cause override tripping when the generator is in overload operation. Another object of the present application is to provide a protection parameter setting device, an apparatus and a computer readable storage medium for a generator and a line thereof, all having the above technical effects.
In order to solve the technical problem, the application provides a method for setting protection parameters of a generator and a circuit thereof, which comprises the following steps:
determining a set value and action time of the timing limit overcurrent protection at the side of the generator body according to the maximum allowable load current of the generator;
respectively determining a set value and action time of direction overcurrent protection at the generator line side according to the set value and action time of the timing limit overcurrent protection at the generator body side; the set value of the direction overcurrent protection at the generator line side is greater than the set value of the timing limit overcurrent protection at the generator body side, and the action time of the direction overcurrent protection at the generator line side is greater than the action time of the timing limit overcurrent protection at the generator body side;
and respectively inputting the set value and the action time of the over-current protection of the timing limit measured by the generator body, and the set value and the action time of the over-current protection of the generator line side direction into the protection device measured by the generator body and the protection device of the generator line side.
Optionally, determining a set value of the timing-limited overcurrent protection on the generator body side according to the maximum allowable load current of the generator includes:
and multiplying the maximum allowable load current of the generator by a preset first reliable coefficient to obtain a set value of the timing-limited overcurrent protection of the generator body side.
Optionally, determining a set value of direction overcurrent protection on the generator line side according to the set value of timing-limited overcurrent protection on the generator body side includes:
and multiplying the set value of the timing-limited overcurrent protection at the side of the generator body by a preset second reliable coefficient to obtain the set value of the directional overcurrent protection at the side of the generator line.
Optionally, a value interval of the first reliability coefficient is 1 to 1.05, and a value interval of the second reliability coefficient is 1.1 to 1.2.
Optionally, the determining the action time of the direction overcurrent protection on the generator line side according to the action time of the timing limit overcurrent protection on the generator body side includes:
and summing the action time of the timing limit overcurrent protection at the side of the generator body with a preset time step difference to obtain the action time of the directional overcurrent protection at the side of the generator line.
Optionally, the time step difference is 0.3 seconds.
Optionally, the value of the action time of the timing-limited overcurrent protection on the generator body side ranges from 0.3 to 0.5 second.
In order to solve the above technical problem, the present application further provides a protection parameter setting device for a generator and a circuit thereof, including:
the first determining module is used for determining a set value and action time of the timing limit overcurrent protection at the side of the generator body according to the maximum allowable load current of the generator;
the second determining module is used for respectively determining the set value and the action time of the direction overcurrent protection at the generator line side according to the set value and the action time of the timing limit overcurrent protection at the generator body side; the set value of the direction overcurrent protection at the generator line side is greater than the set value of the timing limit overcurrent protection at the generator body side, and the action time of the direction overcurrent protection at the generator line side is greater than the action time of the timing limit overcurrent protection at the generator body side;
and the input module is used for respectively inputting the set value and the action time of the over-current protection of the timing limit measured by the generator body, the set value and the action time of the over-current protection of the generator line side direction into the protection device measured by the generator body and the protection device of the generator line side.
In order to solve the above technical problem, the present application further provides a protection parameter setting device for a generator and a line thereof, including:
a memory for storing a computer program;
a processor for implementing the steps of the method for setting the protection parameters of the generator and the line thereof when the computer program is executed.
In order to solve the above technical problem, the present application further provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when being executed by a processor, implements the steps of the protection parameter tuning method for a generator and a line thereof as described above.
The protection parameter setting method for the generator and the circuit thereof comprises the following steps: determining a set value and action time of the timing limit overcurrent protection at the side of the generator body according to the maximum allowable load current of the generator; respectively determining a set value and action time of direction overcurrent protection at the generator line side according to the set value and action time of the timing limit overcurrent protection at the generator body side; the set value of the direction overcurrent protection at the generator line side is greater than the set value of the timing limit overcurrent protection at the generator body side, and the action time of the direction overcurrent protection at the generator line side is greater than the action time of the timing limit overcurrent protection at the generator body side; and respectively inputting the set value and the action time of the over-current protection of the timing limit measured by the generator body, and the set value and the action time of the over-current protection of the generator line side direction into the protection device measured by the generator body and the protection device of the generator line side.
Therefore, the generator and the method for setting the protection parameters of the line thereof provided by the application are characterized in that the generator body side is additionally provided with the timing limit overcurrent protection, the set value and the action time of the direction overcurrent protection of the generator line side are related to the set value and the action time of the timing limit overcurrent protection of the generator body side, the set value of the direction overcurrent protection of the generator line side is greater than the set value of the timing limit overcurrent protection of the generator body side, the action time of the direction overcurrent protection of the generator line side is greater than the action time of the timing limit overcurrent protection of the generator body side, therefore, when the current is abnormal and reaches the set value of the timing limit overcurrent protection of the generator body side at first, the generator body side acts, even if the current is abnormal, the set value of the timing limit overcurrent protection of the generator body side and the set value of the direction overcurrent protection of the generator line, however, because the action time of the generator line side directional overcurrent protection is longer than the action time of the generator body side timing limit overcurrent protection, under the condition, the generator body side acts firstly, and the generator line side override action, namely the override tripping condition of the upper-level line protection, can not occur, so that the condition that the override tripping occurs because the upper-level line protection acts firstly when the generator is in overload operation can be effectively avoided, the fault is conveniently and quickly searched and processed, the generator operation is recovered early, and the power generation amount loss is reduced.
The generator and the protection parameter setting device, the equipment and the computer readable storage medium of the circuit of the generator have the technical effects.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the prior art and the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for setting protection parameters of a generator and a line thereof according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a protection parameter setting device for a generator and a line thereof according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a protection parameter setting device for a generator and a line thereof according to an embodiment of the present application.
Detailed Description
The core of the application is to provide a generator and a protection parameter setting method of a circuit thereof, which can avoid the condition that the superior circuit protection acts first to cause override tripping when the generator is in overload operation. The other core of the application is to provide a generator and a protection parameter setting device, equipment and a computer readable storage medium of a circuit thereof, which all have the technical effects.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic diagram of a method for setting protection parameters of a generator and a line thereof according to an embodiment of the present application, and referring to fig. 1, the method mainly includes:
s101: determining a set value and action time of the timing limit overcurrent protection at the side of the generator body according to the maximum allowable load current of the generator;
specifically, on the basis of overload protection and composite voltage overcurrent protection of the generator body side, timing limit overcurrent protection is additionally arranged on the generator body side. Specifically, comparing a primary value of a composite voltage overcurrent protection constant value of a 25MW dry quenching generator body with a primary value of an overcurrent protection constant value of a superior line direction; comparing the 13MWTRT generator body composite voltage overcurrent protection constant value primary value and the upper line direction overcurrent protection constant value primary value, it can be found that no matter the 25MW dry quenching generator or the 13MWTRT generator is compared, although the upper constant value is larger than the lower constant value, the difference between the upper constant value and the lower constant value is not large, the action time delay of the upper stage and the lower stage is large, the time delay of the upper stage is shorter than that of the lower stage, namely the action time of the upper stage is shorter than that of the lower stage, and if the current reaches the upper constant value and the lower constant value at the same time, the upper overcurrent protection acts first. If the time delay is selectively adjusted, the time delay of the upper stage is adjusted to a larger value, and the requirement of protecting the speed and the mobility during the fault can not be met.
At present, the direction overcurrent protection at the generator line side is set at a time of setting the direction overcurrent protection by avoiding the line calculation load current, and the composite voltage overcurrent protection at the generator body side is set at a time of avoiding the generator rated current. The primary intention is to realize the switching of the composite voltage overcurrent protection action of the generator body when the generator is overloaded through the direction element, however, the direction overcurrent protection direction element on the generator line side does not meet the condition to refuse the action, and when the current and voltage conditions are met, the composite voltage overcurrent protection of the lower stage and the direction overcurrent protection of the upper stage can act.
In addition, when overload and overcurrent occur, the composite voltage overcurrent protection of the generator body can act, the upper-level direction overcurrent protection does not act because the condition of the directional element is not satisfied, but after the generator is in a phase-in running state, for the PSL646 protection device, because the directional element of the PSL646 protection device adopts a 90-degree wiring mode, the directional element protection action angle area is-30-90 degrees, and the generator load current in the phase-in running state is in the action area of the PSL646 protection device direction overcurrent protection. In addition, the difference of the setting of the fixed values of the upper and lower current protection is not large, the time delay of the upper current protection is short, and as long as the current and voltage conditions are met, the lower composite voltage overcurrent protection and the upper directional overcurrent protection can act, so that the condition that the directional overcurrent protection of a grid-connected line of the generator acts first after the generator operates in a phase is caused.
In view of this, the present application adds a timing-limited overcurrent protection related to the maximum allowable load current of the generator on the generator body side, and associates the set value and the operating time of the overcurrent protection on the generator line side with the set value and the operating time of the timing-limited overcurrent protection on the generator body side, so that when the current satisfies the condition, the generator body side first operates, and performs the trip processing after delaying the corresponding operating time.
Step 101 is to adjust the timing over-current protection at the generator body side and determine the set value and the action time of the timing over-current protection at the generator body side. Wherein, the generator allows the maximum load current, and the set value of the timing limit overcurrent protection on the side of the generator body is determined, which comprises the following steps: and multiplying the maximum load current allowed by the generator by a preset first reliable coefficient to obtain a set value of the timing limit overcurrent protection at the side of the generator body.
Specifically, the maximum allowable load current (including the power generation and phase advance running states, according to the overload and static stability capability of the generator) of the generator is set according to the formula Iop1＝K1×IfObtaining a set value of the timing limit overcurrent protection at the side of the generator body, wherein Iop1The set value of the overcurrent protection is defined at fixed time; i isfMaximum load current allowed for the generator, K1The first reliability factor is 1-1.05, and in one embodiment.
In addition, in a specific embodiment, the value of the action time of the timing limit overcurrent protection on the generator body side ranges from 0.3 to 0.5 seconds.
It can be understood that the values of the first reliability coefficient and the action time of the timing-limited overcurrent protection on the generator body side are only a specific embodiment provided by the application, and are not limited only, and the first reliability coefficient and the action time of the timing-limited overcurrent protection on the generator body side can be set differently according to actual situations.
In addition, the overload protection on the side of the generator body can be set according to the rated power of the generator, which is 1-1.2 times, and the overcurrent constant value of the composite voltage overcurrent protection on the side of the generator body can be set according to the rated current of the generator.
S102: respectively determining a set value and action time of direction overcurrent protection at the generator line side according to the set value and action time of timing limit overcurrent protection at the generator body side; the set value of the direction overcurrent protection at the generator line side is greater than the set value of the timing limit overcurrent protection at the generator body side, and the action time of the direction overcurrent protection at the generator line side is greater than the action time of the timing limit overcurrent protection at the generator body side;
specifically, the step aims to adjust the direction overcurrent protection of the generator line side, specifically, the set value of the generator line side direction overcurrent protection is determined according to the set value of the timing limit overcurrent protection of the generator body side, and the action time of the generator line side direction overcurrent protection is determined according to the action time of the timing limit overcurrent protection of the generator body side. And the over-current protection set value in the generator line side direction is greater than the timing limit over-current protection set value in the generator body side, and the action time of the over-current protection in the generator line side direction is greater than the action time of the timing limit over-current protection in the generator body side.
In a specific embodiment, the determining the set value of generator line side direction overcurrent protection according to the set value of timing limit overcurrent protection at the generator body side includes: and multiplying the set value of the timing limit overcurrent protection at the side of the generator body by a preset second reliable coefficient to obtain the set value of the generator line side direction overcurrent protection.
Specifically, the setting is carried out in cooperation with the timing limit overcurrent protection at the side of the generator body, specifically according to a formula Iop2＝K2×Iop1And obtaining a set value of the overcurrent protection in the direction of the generator line side. In the formula Iop1The set value of the overcurrent protection is defined at fixed time; i isop2Set value, K, for generator line side direction overcurrent protection2The second reliability factor is 1.1-1.2, and in one embodiment.
In one specific embodiment, the determining an operation time of the generator line side direction overcurrent protection based on a timing limit operation time of the generator body side overcurrent protection includes: and summing the action time of the timing limit overcurrent protection at the side of the generator body with a preset time step difference to obtain the action time of the overcurrent protection at the side of the generator line.
Specifically, in this embodiment, the action time of the generator body-side timing-limited overcurrent protection and the action time of the generator line-side direction overcurrent protection differ by a time step difference, and the action time of the generator line-side direction overcurrent protection is obtained specifically according to t' ═ t + Δ t. Where t' is the operation time of the generator line side overcurrent protection, t is the operation time of the generator body side timing limit overcurrent protection, Δ t is the time step difference, and in a specific embodiment the time step difference is 0.3 seconds.
Similarly, the values of the second reliability coefficient and the time level difference are only a specific implementation manner provided by the present application, and are not limited uniquely, and the second reliability coefficient and the time level difference may be set adaptively according to actual situations.
In addition, the generator line side also comprises an optical fiber differential setting and a direction time limit quick-break setting.
Differential setting of optical fibers: avoidance of normal line imbalance current setting, Iop3＝Kk×Ibp. In the formula Iop3For setting the differential phase-splitting current of the optical fiberkFor reliable coefficient, take 1.5-2, IbpIs the unbalanced current of the normal line.
Direction time-limiting quick-break: setting two-phase short circuit at the tail end of the line according to the flexibility of the minimum operation mode of the system, wherein the action delay is 0.1-0.3 s, Iop4＝Ik2/Km. In the formula Iop4For a direction-limited quick-break setting, Ik2For two-phase short-circuit current at the tail end of a generator circuit in the minimum operation mode of the system, KmTaking the sensitivity coefficient as 1.3-1.5.
S103: the set value and the action time of the overcurrent protection and the set value and the action time of the overcurrent protection in the direction of the generator line side are respectively input into the protection device measured by the generator body and the protection device at the generator line side.
Specifically, after steps S101 and S102 are completed, the generator body-side timing is further set to limit the set value and the operating time of the overcurrent protection, and the set value and the operating time of the overcurrent protection are input to the generator body-side protection device, and the generator line-side direction set value and the operating time are input to the generator line-side protection device. And then the protection device on the generator body side and the protection device on the generator line side execute corresponding protection actions according to the respective input set value and action time.
Take protection and adjustment of a grid-connected line of a 13MW TRT generator as an example.
Generator parameters: p is 13000kW,
Ue＝10.5kV，Ie841A, transformation ratio 1500/5, direct axis super transient reactance X ″dAt a value of 0.176 per unit, the generator should be able to withstand 1.5 times the overload current for 30 seconds without damage. System parameters: the system side impedance (per-unit value) at the tail end of the TRT generator grid-connected line in the minimum operation mode is 1.1335, and the system side impedance (per-unit value) at the tail end of the TRT generator grid-connected line in the maximum operation mode is 0.5603. When two phases at the tail end of a generator grid-connected line are short-circuited in the minimum operation mode of the system, the short-circuit current provided by the system side is 4852A (the secondary value is 16.17A); when two phases at the near end of the generator are short-circuited in the minimum operation mode of the system, the short-circuit current provided by the system side is 2211A (the secondary value is 7.37A).
Protection setting of a generator body:
overload protection: setting according to 1-1.2 times of rated current of the generator, and taking 3.1A and 9S for transmitting.
Compound voltage overcurrent protection: setting according to the rated current of the generator to be avoided, taking 50V, 9V, 3.6A and 1.5S, and tripping.
And (4) timing limit overcurrent protection: setting according to maximum allowable current of generator under control, Iop1＝K1×If＝1×IfTake 4.2A, 0.3S, trip.
And (3) protection setting of the generator line side:
optical fiber differential: avoiding normal line imbalance current setting (I)bpThe rated current of the generator can be taken as 30 percent and is 0.84A), I)op3＝Kk×Ibp1.68A, 1.7A.
Direction time-limiting quick-break: setting according to the sensitivity of two-phase short circuit at the tail end of the line in the minimum operation mode of the system, Iop4＝Ik2/Km16.17/1.5 ═ 10.78A, 10.8A, 0.1S.
Directional overcurrent: setting by matching with generator body timing limit over-current protection, Iop2＝K2×Iop1＝1.1×4.2＝4.6A，t′＝t+Δt＝0.6s。
The whole is shown in table 1:
TABLE 1
In summary, the generator and the method for setting protection parameters of the line thereof provided by the present application add a timing over-current protection to the generator body side, and associate the set value and the action time of the direction over-current protection of the generator line side with the set value and the action time of the timing over-current protection of the generator body side, and the set value of the direction over-current protection of the generator line side is greater than the set value of the timing over-current protection of the generator body side, and the action time of the direction over-current protection of the generator line side is greater than the action time of the timing over-current protection of the generator body side, so that when the current is abnormal and reaches the set value of the timing over-current protection of the generator body side first, the generator body side acts, even if the current is abnormal and reaches the set value of the timing over-current protection of the generator line side at the same time, however, because the action time of the generator line side directional overcurrent protection is longer than the action time of the generator body side timing limit overcurrent protection, under the condition, the generator body side acts firstly, and the generator line side override action, namely the override tripping condition of the upper-level line protection, can not occur, so that the condition that the override tripping occurs due to the advance action of the upper-level line protection when the generator is in overload operation can be effectively avoided, the fault can be conveniently and quickly searched and processed, the generator operation can be recovered early, and the power generation amount loss is reduced.
The application also provides a generator and a protection parameter setting device of a circuit thereof, and the device described below can be correspondingly referred to with the method described above. Referring to fig. 2, fig. 2 is a schematic diagram of a protection parameter tuning apparatus for a generator and a line thereof according to an embodiment of the present application, and as shown in fig. 2, the apparatus includes:
the first determining module 10 is used for determining a set value and action time of the timing limit overcurrent protection at the side of the generator body according to the maximum allowable load current of the generator;
the second determining module 20 is configured to determine a set value and an action time of the direction overcurrent protection on the generator line side according to the set value and the action time of the timing-limited overcurrent protection on the generator body side; the set value of the direction overcurrent protection at the generator line side is greater than the set value of the timing limit overcurrent protection at the generator body side, and the action time of the direction overcurrent protection at the generator line side is greater than the action time of the timing limit overcurrent protection at the generator body side;
the input module 30 is configured to input a set value and an action time of the overcurrent protection and a set value and an action time of the overcurrent protection in the generator line side direction, which are measured by the generator body, into the protection device measured by the generator body and the protection device in the generator line side, respectively.
On the basis of the foregoing embodiment, optionally, the first determining module 10 is specifically configured to multiply the maximum allowable load current of the generator by a preset first reliable coefficient to obtain a set value of the timing-limited overcurrent protection on the generator body side.
On the basis of the foregoing embodiment, optionally, the second determining module 20 is specifically configured to multiply the set value of the timing-limited overcurrent protection at the generator body side by a preset second reliable coefficient to obtain a set value of the directional overcurrent protection at the generator line side.
On the basis of the above embodiment, optionally, the value interval of the first reliability coefficient is 1 to 1.05, and the value interval of the second reliability coefficient is 1.1 to 1.2.
On the basis of the foregoing embodiment, optionally, the second determining module 20 is specifically configured to sum the action time of the timing-limited overcurrent protection on the generator body side with a preset time step difference to obtain the action time of the directional overcurrent protection on the generator line side.
On the basis of the above embodiment, the time step difference is optionally 0.3 seconds.
On the basis of the above embodiment, optionally, the value range of the action time of the timing-limited overcurrent protection on the generator body side is 0.3 to 0.5 second.
The application also provides a generator and a protection parameter setting method of the generator and a line thereof, and the device comprises a memory 1 and a processor 2, which are shown in figure 3.
A memory 1 for storing a computer program;
a processor 2 for executing a computer program to implement the steps of:
determining a set value and action time of the timing limit overcurrent protection at the side of the generator body according to the maximum allowable load current of the generator; respectively determining a set value and action time of direction overcurrent protection at the generator line side according to the set value and action time of timing limit overcurrent protection at the generator body side; the set value of the direction overcurrent protection at the generator line side is greater than the set value of the timing limit overcurrent protection at the generator body side, and the action time of the direction overcurrent protection at the generator line side is greater than the action time of the timing limit overcurrent protection at the generator body side; the set value and the action time of the overcurrent protection and the set value and the action time of the overcurrent protection in the direction of the generator line side are respectively input into the protection device measured by the generator body and the protection device at the generator line side.
For the introduction of the device provided in the present application, please refer to the above method embodiment, which is not described herein again.
The present application further provides a computer readable storage medium having a computer program stored thereon, which when executed by a processor, performs the steps of:
determining a set value and action time of the timing limit overcurrent protection at the side of the generator body according to the maximum allowable load current of the generator; respectively determining a set value and action time of direction overcurrent protection at the generator line side according to the set value and action time of timing limit overcurrent protection at the generator body side; the set value of the direction overcurrent protection at the generator line side is greater than the set value of the timing limit overcurrent protection at the generator body side, and the action time of the direction overcurrent protection at the generator line side is greater than the action time of the timing limit overcurrent protection at the generator body side; the set value and the action time of the overcurrent protection and the set value and the action time of the overcurrent protection in the direction of the generator line side are respectively input into the protection device measured by the generator body and the protection device at the generator line side.
The computer-readable storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
For the introduction of the computer-readable storage medium provided in the present application, please refer to the above method embodiments, which are not described herein again.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device, the apparatus and the computer-readable storage medium disclosed by the embodiments correspond to the method disclosed by the embodiments, so that the description is simple, and the relevant points can be referred to the description of the method.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The generator and the method, the device, the equipment and the computer readable storage medium for setting the protection parameters of the line thereof provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
Claims (10)
1. A protection parameter setting method for a generator and a circuit thereof is characterized by comprising the following steps:
determining a set value and action time of the timing limit overcurrent protection at the side of the generator body according to the maximum allowable load current of the generator;
respectively determining a set value and action time of direction overcurrent protection at the generator line side according to the set value and action time of the timing limit overcurrent protection at the generator body side; the set value of the direction overcurrent protection at the generator line side is greater than the set value of the timing limit overcurrent protection at the generator body side, and the action time of the direction overcurrent protection at the generator line side is greater than the action time of the timing limit overcurrent protection at the generator body side;
and respectively inputting the set value and the action time of the over-current protection of the timing limit measured by the generator body, and the set value and the action time of the over-current protection of the generator line side direction into the protection device measured by the generator body and the protection device of the generator line side.
2. The protection parameter setting method according to claim 1, wherein determining a set value of a timing-limited overcurrent protection on the generator body side according to a maximum load current allowed by the generator comprises:
and multiplying the maximum allowable load current of the generator by a preset first reliable coefficient to obtain a set value of the timing-limited overcurrent protection of the generator body side.
3. The protection parameter setting method according to claim 2, wherein determining the set value of the directional overcurrent protection on the generator line side according to the set value of the timing-limited overcurrent protection on the generator body side comprises:
and multiplying the set value of the timing-limited overcurrent protection at the side of the generator body by a preset second reliable coefficient to obtain the set value of the directional overcurrent protection at the side of the generator line.
4. The protection parameter setting method according to claim 3, wherein a value range of the first reliability coefficient is 1 to 1.05, and a value range of the second reliability coefficient is 1.1 to 1.2.
5. The protection parameter setting method according to claim 4, wherein determining the action time of the directional overcurrent protection on the generator line side according to the action time of the timing limit overcurrent protection on the generator body side comprises:
and summing the action time of the timing limit overcurrent protection at the side of the generator body with a preset time step difference to obtain the action time of the directional overcurrent protection at the side of the generator line.
6. The protection parameter tuning method of claim 5, wherein the time step difference is 0.3 seconds.
7. The protection parameter setting method according to claim 6, wherein a value of the action time of the timing-limited overcurrent protection on the generator body side ranges from 0.3 to 0.5 seconds.
8. The utility model provides a protection parameter setting device of generator and circuit thereof which characterized in that includes:
the first determining module is used for determining a set value and action time of the timing limit overcurrent protection at the side of the generator body according to the maximum allowable load current of the generator;
the second determining module is used for respectively determining the set value and the action time of the direction overcurrent protection at the generator line side according to the set value and the action time of the timing limit overcurrent protection at the generator body side; the set value of the direction overcurrent protection at the generator line side is greater than the set value of the timing limit overcurrent protection at the generator body side, and the action time of the direction overcurrent protection at the generator line side is greater than the action time of the timing limit overcurrent protection at the generator body side;
and the input module is used for respectively inputting the set value and the action time of the over-current protection of the timing limit measured by the generator body, the set value and the action time of the over-current protection of the generator line side direction into the protection device measured by the generator body and the protection device of the generator line side.
9. The utility model provides a protection parameter of generator and circuit sets equipment which characterized in that includes:
a memory for storing a computer program;
a processor for implementing the steps of the method of setting protection parameters of a generator and its line according to any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of setting protection parameters of a generator and its line according to any one of claims 1 to 7.
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| CN101515715A (en) * | 2009-04-03 | 2009-08-26 | 天津大学 | WAN-based method for protecting feeder line containing distributed power |
| US20120075893A1 (en) * | 2010-09-27 | 2012-03-29 | Fuji Electric Co., Ltd. | Inverter device overvoltage protection method |
| CN102882196A (en) * | 2012-10-23 | 2013-01-16 | 江苏省电力公司扬州供电公司 | Fault isolation method for distribution network containing distributed power sources |
| US20130271879A1 (en) * | 2012-04-17 | 2013-10-17 | Siemens Aktiengesellschaft | Fault Protection System For A Power System Of Dynamically Positioned Vessel |
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| CN101515715A (en) * | 2009-04-03 | 2009-08-26 | 天津大学 | WAN-based method for protecting feeder line containing distributed power |
| US20120075893A1 (en) * | 2010-09-27 | 2012-03-29 | Fuji Electric Co., Ltd. | Inverter device overvoltage protection method |
| US20130271879A1 (en) * | 2012-04-17 | 2013-10-17 | Siemens Aktiengesellschaft | Fault Protection System For A Power System Of Dynamically Positioned Vessel |
| CN102882196A (en) * | 2012-10-23 | 2013-01-16 | 江苏省电力公司扬州供电公司 | Fault isolation method for distribution network containing distributed power sources |
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