CN114336542A - Generator for accurate partitioning of thermal power plant and auxiliary power grounding protection method - Google Patents
Generator for accurate partitioning of thermal power plant and auxiliary power grounding protection method Download PDFInfo
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- CN114336542A CN114336542A CN202111459419.XA CN202111459419A CN114336542A CN 114336542 A CN114336542 A CN 114336542A CN 202111459419 A CN202111459419 A CN 202111459419A CN 114336542 A CN114336542 A CN 114336542A
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Abstract
The invention discloses a generator for accurate partitioning of a thermal power plant and a ground protection method for service power, which are used for distinguishing the generator and the in-area and out-area ground faults of each service branch, and are combined with flexible CT, PT, generator-transformer group protection and a small-current wiring line selection device to form a set of innovative whole-plant ground protection scheme, so that any one ground fault point of the whole plant can be reliably judged, the power failure range is reduced through accurate protection action, and the reliable continuous operation of the generator and the service power is ensured. The generator for the accurate partition of the thermal power plant and the ground protection method for the service power provided by the invention improve the power supply reliability of the service power system of the thermal power plant, thereby improving the reliability of heat supply, reducing the major loss of a heat user caused by heat supply interruption and improving the economic benefit of the thermal power plant.
Description
Technical Field
The invention relates to a generator for accurate partitioning of a thermal power plant and a ground protection method for service power, belonging to the technical field of power generation and electricity in the power industry.
Background
The grounding modes of the generator mainly include 3 types: the generator neutral point is not grounded, the generator neutral point is grounded through a high resistor, and the generator neutral point is grounded through an arc suppression coil. The high pressure station service power system ground connection mode of thermal power factory mainly has 3: not grounded, grounded through high resistance, and grounded through low resistance.
The neutral point ungrounded system is allowed to operate for a period of time when the capacitance current to the ground is small, the power supply reliability is guaranteed, but once the capacitance current exceeds an allowed value, an electric arc cannot be automatically extinguished, and the risk of electric arc grounding overvoltage and burning of equipment and cables exists. The neutral point can directly eliminate the defect of a neutral point ungrounded system through a low-resistance grounded system, realize sensitive and selective grounding protection and reduce the danger of arc grounding overvoltage. The neutral point can limit the earth fault current within a certain level through a high-resistance earthing system, and can also restrain transient overvoltage. However, the high-resistance grounding system still fails to solve the problem of self-extinguishing of the arc when the single-phase grounding is performed. In an industrial power system, a large number of cables are arranged, once the cables are grounded in a single phase, electric arcs cannot be extinguished in time, and serious consequences can be caused. The neutral point is through arc suppression coil ground system, and this kind of ground connection mode utilizes arc suppression coil's inductive current to compensate the electric capacity current, and fault current when making single-phase ground is very little, and electric arc can extinguish by oneself, can not harm equipment, also can take the trouble to operate for a period, and the power supply reliability is higher.
The traditional small-sized units at home and abroad mostly adopt the non-grounding operation mode of a neutral point of a generator and a non-grounding operation mode of a service system. The large and medium-sized units mostly adopt a mode of grounding a generator neutral point through a grounding transformer in foreign countries, the hydraulic generators mostly adopt a mode of grounding the generator neutral point through an arc suppression coil in the former years in China, and the mode of grounding the generator neutral point through the grounding transformer in recent years is gradually transited to a mode of grounding the generator neutral point through the grounding transformer in high resistance. The industrial power of large and medium-sized units is mostly grounded through low resistance.
For the power plant service power, the grounding operation mode through the arc suppression coil is adopted, DL/T5153-. Along with the reliability requirement of external heat supply of the small backpressure unit is higher and higher, the reliability requirement of the service power of the power plant is also improved. The traditional small-sized straight condensing unit usually adopts a generator straight wiring scheme because the scale of a plant power system is small, and a generator neutral point adopts an ungrounded mode. After 21 st century, the capacity of backpressure unit set is small, the boiler capacity is large, and the scale of service system is large in the novel coal-fired thermal power plant. When a direct wiring scheme of the generator is selected, when the single-phase-to-ground capacitance current of the system is larger than 10A, if the service electric energy is ensured to continue to operate when single-phase grounding occurs, the generator and the service electric energy need to adopt a grounding scheme through an arc suppression coil. The adoption of arc suppression coil compensation after single-phase grounding does not allow long-term operation, and how to judge the position of the grounding point timely and accurately to remove faults is very important.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the invention provides a generator for accurate partitioning of a thermal power plant and a ground protection method for service power, which are used for distinguishing the generator and the in-area and out-area ground faults of each service branch, and a set of innovative ground protection scheme for the whole plant is formed by combining flexible CT, PT, generator and transformer group protection and a small-current wiring line selection device, so that any ground fault point of the whole plant can be reliably judged, the power failure range is reduced through accurate protection action, and the reliable continuous operation of the generator and the service power is ensured.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a generator and station service ground protection method for accurate subregion of steam power plant, includes generator, generator offside branch, station bus, station feeder, the generator end is provided with CT1, PT1, circuit breaker CB1, generator offside bus sets up between generator and main transformer, generator offside branch is connected with station bus through the reactor, be connected with station feeder on the station bus, be provided with PT2 between circuit breaker CB1 and the main transformer, be provided with CT2, circuit breaker CB2 on the inlet wire of station bus, be provided with circuit breaker CB3 on the station feeder, including following step:
when a grounding fault occurs at the K1 position in the generator, and under the working condition that the neutral point of the generator and the neutral point of the generator normally operate through the arc suppression coil, the single-phase grounding capacitance current of the fault point is smaller than the allowable value of the generator, and a fundamental wave zero sequence voltage stator grounding protection alarm locked in the zero sequence current direction is used for alarming. When the generator normally operates and the neutral point of the generator is in the maintenance working condition through the arc suppression coil, the single-phase grounding capacitance current of the fault point exceeds the allowable value of the generator, the fundamental wave zero sequence voltage stator locked in the zero sequence current direction is subjected to grounding protection, and the generator outlet circuit breaker CB1 is tripped, the magnetism is removed, the valve is closed, and the generator is shut down.
When a ground fault occurs at the position of a factory feeder K4 and under the working condition that a generator and a generator neutral point normally operate through an arc suppression coil, the single-phase grounding capacitance current of the fault point is smaller than an allowable value, and a small-current grounding line selection device gives an alarm. When the generator normally operates, the neutral point of the generator is in a maintenance working condition through the arc suppression coil, or the generator quits operation due to faults or maintenance, the low-current grounding line selection device protects the action to jump the fault feeder outlet circuit breaker CB 3.
When the station bus K3 has ground fault, and the generator neutral point are operated normally via the arc suppression coil, the single-phase ground capacitance current of the fault point is smaller than the allowable value, and the small current grounding line selection device gives an alarm. When the generator normally operates and the neutral point of the generator is in an overhauling working condition through an arc suppression coil, or the generator quits operating due to faults or overhauling, the low-current grounding line selection device protects the outlet circuit breaker CB2 on the lower side of the action jump reactor and needs to lock service power switching, and the action protection time needs to be kept away from the feeder line grounding protection action time of a service branch.
When a grounding fault occurs at the branch K2 outside the generator area, and under the working condition that the neutral point of the generator and the neutral point of the generator normally operate through the arc suppression coil, the single-phase grounding capacitance current of the fault point is smaller than an allowable value, and the main transformer low-voltage side zero-sequence voltage protection gives an alarm through time delay. When the generator normally operates, the neutral point of the generator is in a maintenance working condition through the arc suppression coil, or the generator quits operation due to failure or maintenance, the single-phase grounding capacitance current flowing through the generator does not exceed the allowable value of the generator, but the single-phase grounding capacitance current of the fault point exceeds the allowable value of the high-voltage service grounding current. The zero sequence voltage protection at the low-voltage side of the main transformer acts on full stop, the circuit breaker CB1 and the circuit breaker CB2 are tripped, the service switching is started, and the protection action time needs to be avoided from the service branch grounding protection action time and the selective generator stator grounding protection action time.
Preferably, the CT1, PT1 and PT2 adopt flexible optical CT and PT.
Preferably, the action delay time of the fundamental zero-sequence voltage stator ground protection is set to t1, and t1=1 s.
Preferably, the protection action time delay of the low-current wiring selection device is set to be t2, and t2=2 s.
Preferably, the action delay of the outlet circuit breaker CB2 at the lower side of the low-current grounding line selection device protection action tripping reactor is set to be t3= t2+0.5s, and t3=2.5 s.
Preferably, the main transformer low-voltage side zero sequence voltage protection acts on full stop, a circuit breaker CB1 and a circuit breaker CB2 are tripped, and the action delay of starting the service power switching is set to be t4= t3+0.5 and t4=3 s.
Has the advantages that: the invention provides a protection design scheme for single-phase grounding protection of a generator and service power in a mode of grounding through an arc suppression coil. Through the design subregion, accurate difference generator district inside and outside ground fault, the ground fault of station service inlet wire, generating line and feeder department, with the accurate excision of trouble, reduce the fault range to combine automation equipment's such as fast switching cooperation action, guaranteed the continuous operation of station service.
The invention can improve the power supply reliability of the plant power system of the heat supply power plant, thereby improving the reliability of heat supply, reducing the major loss of heat users caused by heat supply interruption and also improving the economic benefit of the heat power plant.
Drawings
Fig. 1 is a primary wiring diagram of the present invention in the running mode of generator and station service, main transformer and station service.
Fig. 2 is a primary wiring diagram of the present invention in the standby mode of operation.
Fig. 3 is a schematic circuit diagram of an application scenario of the method of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
A primary wiring of an internal thermal power plant in a certain industrial park of Shandong smoke platform is shown in a figure 1-2, a 50MW back-extraction steam turbine generator unit is subjected to voltage boosting and changing by 10/110kV, a 110kV cable line is conveyed to a 110kV bus section of an existing 110kV total substation in an industrial park, a station-used starting standby power supply is provided with a 35/10kV high-voltage starting/standby transformer, and a 35kV cable line is led from a 35kV bus section of the industrial park substation.
Primary system configuration aspect: in order to provide the reliability of the service power and not influence the stable operation of the service power when the generator breaks down, a generator outlet circuit breaker is arranged between the generator and the main transformer. Because the capacity of the boiler for supplying heat to the outside of the thermal power plant is large, the scale of the auxiliary power system is large, the total capacitor current of the auxiliary power system is 28A through calculation, and the capacitor current of the equipment such as a generator is added, so that the capacitor current of the whole system is about 32A. According to the standard and the information of the generator factory, the maximum allowable grounding current of the generator is 3A, so that only the arc suppression coil can be grounded or grounded in a high resistance mode. Because the heat supply reliability requirement of the thermal power plant is high, the neutral point of the generator of the thermal power plant is provided with the arc suppression coil which is grounded. Each boiler is provided with 2 sections of 10kV high-voltage station buses, no high-voltage station transformer is arranged, high-voltage station current-limiting reactors are respectively arranged in high-voltage station branches for limiting short-circuit current, and the high-voltage station power supply branches are connected to the low-voltage side of a main transformer. The high-voltage starting/standby low-voltage side equipment is provided with a 10kV standby section to provide a whole-plant starting standby power supply.
In the aspect of secondary system configuration, independent voltage transformers PT are arranged at the end of a generator, on the low-voltage side of a main transformer and on a 10kV bus section, flexible optical CTs are arranged at the outlet of the generator, and zero sequence CTs are arranged on each incoming line and each feeder line of the 10kV bus section. A generator protection device and a main transformer protection device which are independent of each other are arranged for protecting the generator and the main transformer, the flexible optical CT1 and the PT1 are connected into the generator protection device, and the PT2 is connected into the main transformer protection device. Each section of 10kV station bus is provided with a set of low-current grounding line selection device for grounding protection of station power, and the incoming line loop zero-sequence CT2, each feeder line loop zero-sequence CT3 and each section of station bus PT3 are connected to the low-current grounding line selection device. Each section of 10kV station bus is provided with a set of microcomputer type station power supply fast switching device for switching station power accidents.
A protection that is used for generator neutral point to pass through arc suppression coil ground connection mode's thermal power plant generally needs to realize following operating mode:
(1) the generator and the neutral point of the generator normally run through the arc suppression coil, the generator provides a power supply for plant power, and the thermal power plant normally supplies heat and generates electricity.
(2) The generator normally operates, the neutral point of the generator is in the maintenance working condition through the arc suppression coil, the generator provides a power supply for plant power, and the thermal power plant normally supplies heat and generates electricity.
(3) The generator stops running due to faults or maintenance, a main transformer provides a power supply for plant power, and the thermal power plant normally supplies heat but does not generate electricity.
And under the working condition (1), when the single-phase earth fault occurs, the device can continue to operate with the fault. However, because the neutral point of the generator is put into the generator through the arc suppression coil, when a single-phase ground fault occurs, the arc suppression coil generates inductive current under the action of zero-sequence voltage, and the inductive current compensates the capacitive current of the single-phase ground to limit the single-phase ground current within the allowable value of the single-phase ground fault current of the stator winding of the generator. Because the single-phase grounding current after compensation is within 3A, a flexible optical CT with high sensitivity is arranged at the generator end, and the accuracy of the zero-sequence current is ensured. Meanwhile, a small-current grounding line selection device adopting a plurality of methods such as comprehensive transient phase comparison method line selection, transient power direction method line selection, transient phase comparison amplitude method line selection and the like is selected, single-phase grounding line selection of an arc suppression coil grounding system can be accurately judged, and line selection accuracy is guaranteed.
1) The flexible optical CT and PT are arranged at the outlet of the generator and are matched with a generator protection device to distinguish the external grounding fault in the generator area.
2) The high-voltage station power supply incoming cabinet and each feeder line cabinet are internally provided with a through zero sequence CT, a PT is arranged at a high-voltage station power bus, and the PT is matched with a small-current grounding line selection device to distinguish where a feeder line grounding fault or a bus grounding fault occurs.
3) Through the time delay setting matching of the main transformer protection device, the generator protection device and the low-current grounding line selection device, the grounding fault occurring in the interval from the outlet of the starting motor to the service power incoming line cabinet is identified.
When the arc suppression coil is put into operation, only an alarm is given when a ground fault occurs, and the fault is removed manually; when the arc suppression coil is out of operation, the ground fault occurs and needs to be protected to trip, and the service switching is started or locked according to the fault condition. The distinguishing of the states of the arc suppression coil in and out is realized by sending the auxiliary contact position of the arc suppression coil isolating switch to a generator protection device, a small current grounding line selection device and a main transformer protection device, and program logics are modified according to the requirements by research personnel of manufacturers of the generator protection device, the small current grounding line selection device and the main transformer protection device.
Now, combining the working conditions (1), (2) and (3) with fig. 3, the protection logic coordination scheme of the present invention is implemented as follows:
1) when a ground fault occurs at the K1 inside the generator, the zero sequence voltage of the generator terminal PT1 and the zero sequence current of the flexible optical CT1 at the generator outlet are collected through a generator protection device. When the working condition (1) is adopted, the single-phase grounding capacitance current of the fault point is smaller than the allowable value of the generator, the grounding protection of the fundamental wave zero sequence voltage stator locked by the zero sequence current direction gives an alarm, and the fault can be eliminated manually. When the working condition (2) is adopted, the single-phase grounding capacitance current of the fault point exceeds the allowable value of the generator, and the fundamental wave zero sequence voltage stator grounding protection tripping generator outlet circuit breaker CB1, which is locked by the zero sequence current direction, is used for carrying out demagnetization, closing a valve, stopping the generator and the like. The action delay time of the fundamental zero sequence voltage stator grounding protection can be set to t1, and t1=1s is recommended. The generator protection device program needs to be developed: the generator protection is added with a selective stator grounding protection function based on flexible optical CT, wherein the zero sequence voltage is taken from PT1 in figure 1, and the zero sequence current is taken from CT1 (flexible optical CT). It should be noted that at this time, the high-voltage power supply for the plant is obtained by the main transformer, so that shutdown is not required, and reliability of heat supply of the thermal power plant is ensured.
2) When the ground fault occurs at the service feeder K4, the voltage of the service bus PT3 and the zero sequence current of the CT2 and each feeder CT3 are collected by the small-current ground line selection device. At the moment, the zero sequence current value of the CT3 is the largest (when the arc suppression coil is switched in, the current transient amplitude is the largest and the transient phase is different from a non-fault circuit; when the arc suppression coil is not switched in, the current steady-state amplitude is the largest), when the working condition (1) is met, the single-phase grounding capacitance current of the fault point is smaller than the allowable value, the small-current grounding line selection device gives an alarm, and the fault can be eliminated manually. And when working conditions (2) and (3) are met, the low-current grounding line selection device protects the action to jump the fault feeder outlet circuit breaker CB 3. The protection action delay of the low-current wiring selection device can be set to t2, and t2=2s is recommended. It should be noted that only one power supply loop is affected at this time, so that the normal operation of the boiler can be ensured, and the reliability of heat supply of the thermal power plant can be ensured.
3) When the ground fault occurs at the position of the service bus K3, the voltage of the service bus PT3 and the zero sequence current of the CT2 and each feeder line CT3 are collected by the small-current ground line selection device. At the moment, all the polarities of the zero-sequence CT points to the circuit through the bus, when the working condition (1) is met, the single-phase grounding capacitance current of the fault point is smaller than an allowable value, the small-current grounding line selection device gives an alarm, and the fault can be eliminated manually. Under the working conditions (2) and (3), the low-current grounding line selection device protects the outlet circuit breaker CB2 on the lower side of the jump reactor, and meanwhile, service switching needs to be locked, and the protection action time needs to be kept away from the feeder line grounding protection action time of a service branch. The step difference is taken to be 0.5s, and it is recommended that the setting t3= t2+0.5=2+0.5=2.5 s. It should be noted that the boiler may not be stopped after the fault is removed, and if the boiler is configured with two sets of auxiliary machines, the boiler may not be stopped, so as to ensure the reliability of heat supply of the thermal power plant.
4) When a ground fault occurs at K2 outside a generator area, a main transformer protection device acquires the zero sequence voltage of a main transformer low-voltage side PT 2. When the working condition (1) is adopted, the single-phase grounding capacitance current of the fault point is smaller than an allowable value, the zero sequence voltage protection of the low-voltage side (not passing direction) of the main transformer is subjected to time delay alarm, and the fault can be eliminated manually. And when the working conditions (2) and (3) are met, the single-phase grounding capacitance current flowing through the generator is provided for the generator, the single-phase grounding capacitance current does not exceed the allowable value of the generator, but the single-phase grounding capacitance current of a fault point exceeds the allowable value of the high-voltage service grounding current. The method comprises the steps that the zero sequence voltage protection action of the low-voltage side (without direction) of a main transformer is stopped completely, CB1 and CB2 are skipped, service power switching is started simultaneously, service branch grounding protection action time and selective generator stator grounding protection action time need to be avoided in the protection action time, and t4= t3+0.5=3s is recommended to be taken in the protection action time. The main transformer protection device program needs to be developed: the transformer protection is added with a main transformer low-voltage side zero-sequence voltage protection function, which can act on tripping complete stop, wherein the zero-sequence voltage is taken from PT2 in figure 1. It should be noted that at this time, the high-voltage power supply for the plant is obtained from the startup and standby mode through the action of the fast switching device, so that the shutdown is not stopped, and the reliability of heat supply of the thermal power plant is ensured.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (6)
1. The utility model provides a generator and station service ground protection method for accurate subregion of steam power plant, includes generator, generator offside branch, station bus, station feeder, the generator end is provided with CT1, PT1, circuit breaker CB1, generator offside bus sets up between generator and main transformer, generator offside branch is connected with station bus through the reactor, be connected with station feeder on the station bus, be provided with PT2 between circuit breaker CB1 and the main transformer, be provided with CT2, circuit breaker CB2 on the inlet wire of station bus, be provided with circuit breaker CB3 on the station feeder, its characterized in that: the method comprises the following steps:
when a grounding fault occurs at the K1 position in the generator, under the working condition that the neutral point of the generator and the neutral point of the generator normally operate through an arc suppression coil, the single-phase grounding capacitance current of the fault point is smaller than the allowable value of the generator, and a fundamental wave zero sequence voltage stator grounding protection alarm locked in the zero sequence current direction is used for alarming; when the generator normally operates and the neutral point of the generator is in a maintenance working condition through an arc suppression coil, the single-phase grounding capacitance current of a fault point exceeds the allowable value of the generator, fundamental wave zero sequence voltage stator grounding protection is locked by the zero sequence current direction, and a generator outlet circuit breaker CB1 is tripped, the magnetism is removed, a valve is closed, and the generator is shut down;
when a ground fault occurs at a station feeder K4, and under the working condition that a generator and a generator neutral point normally operate through an arc suppression coil, the single-phase grounding capacitance current of the fault point is smaller than an allowable value, and a small-current grounding line selection device gives an alarm; when the generator normally operates, the neutral point of the generator is in a maintenance working condition through an arc suppression coil, or the generator quits operation due to failure or maintenance, the low-current grounding route selection device protects the action to jump the fault feeder outlet circuit breaker CB 3;
when a ground fault occurs at a station bus K3, and under the working condition that a generator and a generator neutral point normally operate through an arc suppression coil, the single-phase grounding capacitance current of a fault point is smaller than an allowable value, and a small-current grounding line selection device gives an alarm; when the generator normally operates and the neutral point of the generator is in an overhauling working condition through an arc suppression coil, or the generator quits operating due to faults or overhauling, the low-current grounding line selection device protects an outlet circuit breaker CB2 on the lower side of the action jump reactor, and meanwhile, service power switching needs to be locked, and the action protection time needs to be avoided by the feeder line grounding protection action time of a service branch;
when a grounding fault occurs at a branch K2 outside a generator area, under the working condition that a neutral point of a generator and a generator normally operate through an arc suppression coil, the single-phase grounding capacitance current of the fault point is smaller than an allowable value, and a main transformer low-voltage side zero-sequence voltage protection is subjected to delayed alarm; when the generator normally operates, the neutral point of the generator is in a maintenance working condition through the arc suppression coil, or the generator stops operating due to failure or maintenance, the single-phase grounding capacitance current flowing through the generator does not exceed the allowable value of the generator, but the single-phase grounding capacitance current of the fault point exceeds the allowable value of the high-voltage service grounding current; the zero sequence voltage protection at the low-voltage side of the main transformer acts on full stop, the circuit breaker CB1 and the circuit breaker CB2 are tripped, the service switching is started, and the protection action time needs to be avoided from the service branch grounding protection action time and the selective generator stator grounding protection action time.
2. The generator for accurate partitioning of thermal power plant and the ground protection method for service power according to claim 1, wherein: the CT1, PT1 and PT2 adopt flexible optical CT and PT.
3. The generator for accurate partitioning of thermal power plant and the ground protection method for service power according to claim 1, wherein: the action delay time of the fundamental zero sequence voltage stator grounding protection is set to be t1, and t1=1 s.
4. The generator for accurate partitioning of thermal power plant and the ground protection method for service power according to claim 1, wherein: the protection action time delay of the low-current wiring selection device is set to be t2, and t2=2 s.
5. The generator for accurate partitioning of thermal power plant and the ground protection method for service power according to claim 1, wherein: the action delay of an outlet circuit breaker CB2 at the lower side of a low-current grounding line selection device protective action jump reactor is set to be t3= t2+0.5s, and t3=2.5 s.
6. The generator for accurate partitioning of thermal power plant and the ground protection method for service power according to claim 1, wherein: the main transformer low-voltage side zero sequence voltage protection acts on full stop, a circuit breaker CB1 and a circuit breaker CB2 are jumped, and the action delay of starting the service power switching is set to t4= t3+0.5 and t4=3 s.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115764837A (en) * | 2022-10-21 | 2023-03-07 | 国网四川省电力公司电力科学研究院 | Fault line selection analysis method and device based on subnet segmentation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115764837A (en) * | 2022-10-21 | 2023-03-07 | 国网四川省电力公司电力科学研究院 | Fault line selection analysis method and device based on subnet segmentation |
| CN115764837B (en) * | 2022-10-21 | 2023-12-26 | 国网四川省电力公司电力科学研究院 | Fault line selection analysis method and device based on subnet segmentation |
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