CN110596512A - Large-scale transformer differential protection polarity verification method and device and computer equipment - Google Patents
Large-scale transformer differential protection polarity verification method and device and computer equipment Download PDFInfo
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Abstract
The application relates to a large transformer differential protection polarity verification method and device and computer equipment. The method comprises the steps of acquiring the differential current of a large transformer in the starting process of the large motor; the large motor is connected to the low-voltage side of the large transformer; the method comprises the steps of determining that the differential protection polarity of the large transformer is correct if the differential current meets a preset polarity condition, obtaining the differential current of the large transformer in the starting process of the large motor by using the starting current of the large motor as the load current for the differential protection polarity check of the large transformer, judging that the differential protection polarity of the large transformer is correct when the differential current meets the preset polarity condition, and meeting the requirement of the protection polarity check of the large transformer of a newly-built power plant, so that the large transformer can reach the operation condition when being put into operation.
Description
Technical Field
The application relates to the technical field of debugging of large transformers in power plants, in particular to a method and a device for verifying differential protection polarity of a large transformer and computer equipment.
Background
The large transformer is an important device in a power plant and is a hub device for connecting the power plant and a power grid. The electric quantity generated by the power plant must be transmitted to the power grid through the step-up transformer, and conversely, the electric quantity of the power grid must be provided to the factory power supply of the power plant through the step-down transformer. And the factory power supply of the power plant is a precondition for starting debugging and partial commissioning of each auxiliary system during the new construction period of the power plant. According to the requirements related to the power grid, before the transformer connected with the power grid is put into operation formally, the transformer must complete a load test so as to ensure that the main protection differential protection of the transformer can act reliably and correctly. The load current of the transformer is used for detecting the polarity direction of the differential protection of the transformer, whether the technical requirements of the microcomputer protection device of the transformer are met or not is a necessary condition for the transformer to be put into operation. However, in the implementation process, the inventor finds that at least the following problems exist in the conventional technology: the traditional technology can not meet the test requirements of a newly built power plant.
Disclosure of Invention
In view of the above, it is necessary to provide a method, an apparatus and a computer device for verifying the polarity of the differential protection of the large transformer, which can meet the testing requirements of the newly built power plant.
A large transformer differential protection polarity verification method comprises the following steps:
acquiring the differential current of a large transformer in the starting process of the large motor; the large motor is connected to the low-voltage side of the large transformer;
if the differential current meets the preset polarity condition, the differential protection polarity of the large-scale transformer is confirmed to be correct; the preset polarity condition is obtained based on the technical requirements of microcomputer protection.
In one embodiment, the step of obtaining the differential current of the large transformer during the starting process of the large motor further comprises the steps of:
respectively collecting high-voltage side secondary current and low-voltage side secondary current of a large transformer;
and obtaining the differential current of the large transformer according to the high-voltage side secondary current and the low-voltage side secondary current.
In one embodiment, in the step of respectively collecting the high-voltage side secondary current and the low-voltage side secondary current of the large transformer:
the high-voltage side current transformer of the large transformer is connected through a wave recorder to collect high-voltage side secondary current;
and the low-voltage side current transformer is connected with the large transformer through the wave recorder to collect the secondary current of the low-voltage side.
In one embodiment, the predetermined polarity condition is that the differential current is zero, and the polarities of the high-side secondary current and the low-side secondary current in the differential current are the same or opposite.
In one embodiment, the preset polarity condition is that the amplitude and phase of the high-side secondary current and the low-side secondary current in the differential current at the same time coincide with the actual current of the large-scale transformer, and the polarity of the high-side secondary current and the polarity of the low-side secondary current in the differential current are the same or opposite.
A large transformer differential protection polarity verification device comprises:
the data acquisition module is used for acquiring the differential current of the large transformer in the starting process of the large motor; the large motor is connected to the low-voltage side of the large transformer;
and the condition confirmation module is used for confirming that the differential protection polarity of the large transformer is correct if the differential current meets the preset polarity condition.
In one embodiment, the data acquisition module comprises:
the current acquisition unit is used for respectively acquiring the high-voltage side secondary current and the low-voltage side secondary current of the large transformer;
and the differential current acquisition unit is used for acquiring the differential current of the large-scale transformer according to the high-voltage side secondary current and the low-voltage side secondary current.
In one embodiment, the current collection unit includes:
the high-voltage side secondary current acquisition unit is used for connecting a high-voltage side current transformer of the large transformer through a wave recorder and acquiring high-voltage side secondary current;
and the low-voltage side secondary current acquisition unit is used for connecting a low-voltage side current transformer of the large transformer through the wave recorder and acquiring low-voltage side secondary current.
A microcomputer protection device, comprising a processor; the switching value input/output circuit is connected with the processor, and the processor is used for realizing the steps of the method.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method.
One of the above technical solutions has the following advantages and beneficial effects:
acquiring differential current of a large transformer in the starting process of a large motor connected to the low-voltage side of the large transformer; the method comprises the steps of determining that the differential protection polarity of the large transformer is correct if the differential current meets a preset polarity condition, obtaining the differential current of the large transformer in the starting process of the large motor by using the starting current of the large motor as the load current for the differential protection polarity check of the large transformer, judging that the differential protection polarity of the large transformer is correct when the differential current meets the preset polarity condition, and meeting the requirement of the protection polarity check of the large transformer of a newly-built power plant, so that the large transformer can reach the operation condition when being put into operation.
Drawings
FIG. 1 is a schematic flow chart illustrating a method for verifying differential protection polarity of a large transformer according to an embodiment;
FIG. 2 is a flow chart illustrating the step of obtaining differential current in one embodiment;
FIG. 3 is a schematic diagram of a test structure in one embodiment;
FIG. 4 is a schematic diagram of a current waveform in one embodiment;
FIG. 5 is a block diagram of an exemplary embodiment of a large transformer differential protection polarity verification apparatus;
FIG. 6 is a diagram illustrating the internal structure of the microprocessor protection device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In order to solve the problem that the conventional technology cannot meet the test requirements of a newly-built power plant, in one embodiment, as shown in fig. 1, a method for verifying the polarity of differential protection of a large transformer is provided, which includes the following steps:
step S110, acquiring differential current of a large transformer in the starting process of a large motor; the large motor is connected to the low voltage side of the large transformer.
It should be noted that before the large transformer is put into operation, the differential protection polarity of the large transformer needs to be verified, but in a newly-built power plant, the protection polarity verification cannot be completed because the low-voltage side of the large transformer does not have a large enough load power supply, and the renting of the load power supply to perform a load test on the large transformer generally consumes hundreds of thousands or even millions of test costs, which brings huge economic pressure to the power plant. In order to solve the problems, the application provides a method for verifying the differential protection polarity of the large transformer, which can meet the requirements of a newly-built power plant, is simple and economic, and has great significance for simplifying the verification of the large transformer and reducing the cost of inspection.
The differential protection (provided by microcomputer protection equipment) is the main protection in various protections of the large transformer, and can reflect the internal phase short circuit, the high-low voltage side single-phase grounding short circuit and the turn-to-turn short circuit fault of the large transformer.
The large motor can normally operate, and at the moment of starting the large motor (the starting time of the large motor is generally 10 seconds), the starting current of the large motor is generally 4 to 7 times of the rated current and is enough to be used as the load current for verifying the protection polarity of the large transformer. In one example, during the large motor start-up, in the step of obtaining the differential current of the large transformer: the differential current of the large transformer is obtained within 10 seconds after the large motor is powered on. Large motors may be, but are not limited to: permanent magnet synchronous motors, reluctance synchronous motors and hysteresis synchronous motors.
In one example, as shown in fig. 2, the step of obtaining the differential current of the large transformer during the large motor starting process further includes the steps of:
and step S210, respectively collecting the high-voltage side secondary current and the low-voltage side secondary current of the large transformer.
The current transformer at the high-voltage side of the large transformer is connected through a wave recorder to collect secondary current at the high-voltage side; and the low-voltage side current transformer is connected with the large transformer through the wave recorder to collect the secondary current of the low-voltage side. The high-voltage side and the low-voltage side of the large transformer are respectively provided with a current transformer, the secondary side currents of the current transformers are respectively recorded by a wave recorder, and the secondary currents of the high-voltage side and the low-voltage side of the large transformer are recorded by the wave recorder.
Step S220, obtaining a differential current of the large transformer according to the high-voltage side secondary current and the low-voltage side secondary current.
It should be noted that the difference between the high-voltage side secondary current and the low-voltage side secondary current is the differential current of the large-scale transformer.
Step S120, if the differential current meets a preset polarity condition, the differential protection polarity of the large-scale transformer is confirmed to be correct; the preset polarity condition is obtained based on the technical requirements of microcomputer protection.
In one example, the predetermined polarity condition is that the differential current is zero, and the polarities of the high-voltage side secondary current and the low-voltage side secondary current in the differential current are the same or opposite.
In yet another example, the preset polarity condition is that the magnitude and phase of the high-side secondary current and the low-side secondary current in the differential current coincide with the actual current of the large-sized transformer at the same time, and the polarity of the high-side secondary current and the polarity of the low-side secondary current in the differential current are the same or opposite.
In order to further understand the method steps of the present application, specific applications are now described as examples:
parameters of the large-scale transformer: capacity of 58000kVA (kilovolt ampere); the voltage transformation ratio is 220/6.6kV (kilovolt); group Y, yn 0; the transformation ratio of the high-voltage side current transformer is 600/1; the low-side current transformer transformation ratio is 4000/1.
Load 6kV circulating water motor parameters: the capacity is 3800kW (kilowatt); rated current 457A (amperes).
The method for verifying the differential protection polarity of the large transformer comprises the following steps in practical application:
the large transformer is in test operation, and the high side and the low side of the large transformer are in no-load test operation normally;
the method comprises the following steps that (1) a 6kV bus at the low voltage side of a large transformer is run in a test mode, and the 6kV bus at the low voltage side of the transformer of a power plant is run in a no-load test mode normally;
a current transformer is connected to the high-voltage side and the low-voltage side of the large-scale transformer to form a differential protection secondary current loop, and a wave recorder is connected to the phase line A, the phase line B, the phase line C and the phase line N respectively.
Starting a 6kV circulating water motor, and acquiring a load current of a transformer by using a starting current of the 6kV circulating water motor;
starting a 6kV circulating water motor, and recording the high-voltage side secondary current and the low-voltage side secondary current of the large transformer by using a wave recorder to complete the differential protection polarity check of the transformer;
the detailed analysis process is as follows:
the main purpose of the large transformer load test is to check the correctness of the differential protection polarity of the large transformer. The large transformer needs a larger load current (the secondary current of the high-voltage side of the transformer needs to be more than or equal to 0.02A), the accurate differential current waveform can be recorded by the wave recorder, and the specific current amplitude and phase of the differential current can be detected and displayed by the microcomputer protection equipmentAnd the like. The on-load test capacity of the transformer is about
Starting the load and starting current of a 6kV circulating water motor, and calculating I according to 4 times of rated current of the motorqConverted into the high-voltage secondary circuit load current I of the large-sized transformer 6 × 1828 ÷ 220 ÷ 600 ≈ 0.08A>0.02A, the starting time of the motor is less than 10S (seconds), and the load requirement of the transformer is met.
Assuming that the technical requirements of the microcomputer protection device of the transformer are that the polar ends of the current transformers on the high-voltage side and the low-voltage side of the transformer face the bus side, the terminals with the same polarity are connected, and a current relay is connected between the two connecting wires in series (as shown in fig. 3).
And if the differential current of the microcomputer protection device of the large transformer is judged to be zero and the braking current of the microcomputer protection device of the large transformer meets the technical requirements of microcomputer protection according to the secondary current of the high-voltage side and the secondary current of the low-voltage side, the polarity of the differential protection of the large transformer is correct.
If the high-voltage side secondary current waveform and the low-voltage side secondary current waveform of the large transformer are judged according to the high-voltage side secondary current and the low-voltage side secondary current, the amplitude and the phase of the two-side secondary current waveform at the same moment are consistent with the actual current of the transformer, and the polarity of the current transformer is consistent with the technical requirement of microcomputer protection, the differential protection polarity of the large transformer is correct (as shown in fig. 4).
By example, theoretical calculation is carried out, in the process of a large transformer load test, the secondary current value of the high-voltage side is larger than 0.02A in the test process, namely the starting primary current value of the motor at the low-voltage 6kV side of the large transformer is larger than 440A, so that the test requirements can be met, and different types of motors can be selected as transformer load test conditions.
In each embodiment of the large transformer differential protection polarity verification method, the differential current of the large transformer is obtained in the starting process of a large motor connected to the low-voltage side of the large transformer; the method comprises the steps of determining that the differential protection polarity of the large transformer is correct if the differential current meets a preset polarity condition, obtaining the differential current of the large transformer in the starting process of the large motor by using the starting current of the large motor as the load current for the differential protection polarity check of the large transformer, judging that the differential protection polarity of the large transformer is correct when the differential current meets the preset polarity condition, and meeting the requirement of the protection polarity check of the large transformer of a newly-built power plant, so that the large transformer can reach the operation condition when being put into operation.
It should be understood that although the various steps in the flowcharts of fig. 1 and 2 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1 and 2 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 5, there is provided a large transformer differential protection polarity verification apparatus, including:
the data acquisition module 51 is used for acquiring the differential current of the large transformer in the starting process of the large motor; the large motor is connected to the low-voltage side of the large transformer;
and a condition confirmation module 53, configured to confirm that the differential protection polarity of the large transformer is correct if the differential current satisfies the preset polarity condition.
In one embodiment, the data acquisition module comprises:
the current acquisition unit is used for respectively acquiring the high-voltage side secondary current and the low-voltage side secondary current of the large transformer;
and the differential current acquisition unit is used for acquiring the differential current of the large-scale transformer according to the high-voltage side secondary current and the low-voltage side secondary current.
In one embodiment, the current collection unit includes:
the high-voltage side secondary current acquisition unit is used for connecting a high-voltage side current transformer of the large transformer through a wave recorder and acquiring high-voltage side secondary current;
and the low-voltage side secondary current acquisition unit is used for connecting a low-voltage side current transformer of the large transformer through the wave recorder and acquiring low-voltage side secondary current.
For specific limitations of the large transformer differential protection polarity verification apparatus, reference may be made to the above limitations of the large transformer differential protection polarity verification method, and details are not described herein again. All or part of each module in the large-scale transformer differential protection polarity checking device can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, as shown in FIG. 6, there is provided a microcomputer protection device, including a processor 61; the method further comprises a data acquisition circuit 63, a switching value input/output circuit 65 and an interface circuit 67 which are respectively connected with the processor 61, wherein the processor 61 is used for realizing the steps of the large transformer differential protection polarity verification method in each embodiment of the large transformer differential protection polarity verification method.
In one example, a processor implements the steps of:
acquiring the differential current of a large transformer in the starting process of the large motor; the large motor is connected to the low-voltage side of the large transformer;
and if the differential current meets the preset polarity condition, confirming that the differential protection polarity of the large-scale transformer is correct.
In one example, the processor further implements the steps of:
respectively collecting high-voltage side secondary current and low-voltage side secondary current of a large transformer;
and obtaining the differential current of the large transformer according to the high-voltage side secondary current and the low-voltage side secondary current.
In one example, the processor further implements the steps of:
the high-voltage side current transformer of the large transformer is connected through a wave recorder to collect high-voltage side secondary current;
and the low-voltage side current transformer is connected with the large transformer through the wave recorder to collect the secondary current of the low-voltage side.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring the differential current of a large transformer in the starting process of the large motor; the large motor is connected to the low-voltage side of the large transformer;
and if the differential current meets the preset polarity condition, confirming that the differential protection polarity of the large-scale transformer is correct.
In one embodiment, the computer program when executed by the processor further performs the steps of:
respectively collecting high-voltage side secondary current and low-voltage side secondary current of a large transformer;
and obtaining the differential current of the large transformer according to the high-voltage side secondary current and the low-voltage side secondary current.
In one embodiment, the computer program when executed by the processor further performs the steps of:
the high-voltage side current transformer of the large transformer is connected through a wave recorder to collect high-voltage side secondary current;
and the low-voltage side current transformer is connected with the large transformer through the wave recorder to collect the secondary current of the low-voltage side.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A large transformer differential protection polarity verification method is characterized by comprising the following steps:
acquiring the differential current of a large transformer in the starting process of the large motor; the large motor is connected to the low-voltage side of the large transformer;
if the differential current meets a preset polarity condition, confirming that the differential protection polarity of the large transformer is correct; the preset polarity condition is obtained based on the technical requirements of microcomputer protection.
2. The large transformer differential protection polarity verification method according to claim 1, wherein in the step of obtaining the differential current of the large transformer during the starting process of the large motor, the method further comprises the steps of:
respectively collecting the high-voltage side secondary current and the low-voltage side secondary current of the large transformer;
and acquiring the differential current of the large transformer according to the high-voltage side secondary current and the low-voltage side secondary current.
3. The differential protection polarity verification method for the large transformer according to claim 2, wherein in the step of respectively collecting the high-voltage side secondary current and the low-voltage side secondary current of the large transformer:
connecting a high-voltage side current transformer of the large transformer through a wave recorder, and collecting the high-voltage side secondary current;
and the low-voltage side current transformer of the large transformer is connected through the wave recorder to collect the low-voltage side secondary current.
4. A large transformer differential protection polarity verification method according to any one of claims 1 to 3,
the preset polarity condition is that the differential current is zero, and the polarity of the high-voltage side secondary current and the polarity of the low-voltage side secondary current in the differential current are the same or opposite.
5. A large transformer differential protection polarity verification method according to any one of claims 1 to 3,
the preset polarity condition is that the amplitude and the phase of the high-voltage side secondary current and the low-voltage side secondary current in the differential current at the same moment are consistent with the actual current of the large-scale transformer, and the polarities of the high-voltage side secondary current and the low-voltage side secondary current in the differential current are the same or opposite.
6. The utility model provides a large-scale transformer differential protection polarity verifying unit which characterized in that includes:
the data acquisition module is used for acquiring the differential current of the large transformer in the starting process of the large motor; the large motor is connected to the low-voltage side of the large transformer;
and the condition confirmation module is used for confirming that the differential protection polarity of the large transformer is correct if the differential current meets a preset polarity condition.
7. The large transformer differential protection polarity verification device according to claim 6, wherein the data acquisition module comprises:
the current acquisition unit is used for respectively acquiring the high-voltage side secondary current and the low-voltage side secondary current of the large transformer;
and the differential current acquisition unit is used for acquiring the differential current of the large transformer according to the high-voltage side secondary current and the low-voltage side secondary current.
8. The differential protection polarity verification device of a large transformer according to claim 7, wherein the current collection unit comprises:
the high-voltage side secondary current acquisition unit is used for connecting a high-voltage side current transformer of the large transformer through a wave recorder and acquiring the high-voltage side secondary current;
and the low-voltage side secondary current acquisition unit is used for connecting the low-voltage side current transformer of the large transformer through the wave recorder and acquiring the low-voltage side secondary current.
9. A microcomputer protection device, comprising a processor; the system further comprises a data acquisition circuit, a switching value input and output loop and an interface circuit which are respectively connected with the processor, wherein the processor is used for realizing the steps of the method of any one of claims 1 to 5.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
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Application publication date: 20191220 |