CN210835199U - PT disconnection fault detection unit of automatic excitation device - Google Patents
PT disconnection fault detection unit of automatic excitation device Download PDFInfo
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- CN210835199U CN210835199U CN201921533480.2U CN201921533480U CN210835199U CN 210835199 U CN210835199 U CN 210835199U CN 201921533480 U CN201921533480 U CN 201921533480U CN 210835199 U CN210835199 U CN 210835199U
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Abstract
The utility model provides an automatic exciting arrangement's PT disconnection fault detection unit, is including exciting with terminal voltage transformer, instrument voltage transformer and terminal current transformer, exciting with terminal voltage transformer be connected with AD conversion module through first adapter transformer, AD conversion module link to each other with microcontroller, instrument voltage transformer pass through third adapter transformer and connect microcontroller, terminal current transformer pass through second adapter transformer with AD conversion module link to each other. The utility model discloses regard as supplementary criterion with synchronous generator's electric current, adopt the method of mutually judging between two sets of voltage transformer voltages of synchronous generator and single-phase voltage transformer voltage, judgement voltage transformer disconnection trouble that can be accurate.
Description
Technical Field
The utility model belongs to the technical field of synchronous generator automatic excitation control device's detection and control technique and specifically relates to an automatic excitation device's PT disconnection fault detection unit.
Background
In modern power systems, fast automatic excitation systems of synchronous generator excitation systems have become widely used. The automatic excitation system has rapidity and stability, can timely react to fluctuation and faults in the system, eliminates fault points, maintains the stability of system voltage, maintains the load stability of the generator, has the protection functions of over-excitation limitation, low-excitation limitation and the like, and can also protect a synchronous generator system. The automatic excitation device takes the generator terminal voltage of the generator as a control object, and adjusts the output of the excitation device according to the change of the generator terminal voltage, so as to control the stability of the generator terminal voltage and the load stability of the generator, and the generator terminal voltage is also the judgment basis of various excitation protection functions. The terminal voltage measured value of the automatic excitation device comes from the excitation PT and the instrument PT, namely a voltage transformer, at the generator terminal, and fuses are arranged on the primary sides of the excitation PT and the instrument PT, and if the primary fuse of the PT fuses or a secondary measurement loop is broken, the fault is called PT disconnection. When PT disconnection occurs, the measured value of the terminal voltage of the automatic excitation device is lower than the actual value of the terminal voltage, so that the generator is forced to be in fault by mistake, and further the system is in overvoltage or overload fault. Because the measurement of the PT at the generator end is very important for an automatic excitation system, the automatic excitation device is designed with a PT disconnection detection function, and processing is carried out when a PT measurement loop fails so as to prevent a generator set from generating a fault of false forced excitation.
The PT disconnection detection function in the existing automatic excitation system generally adopts a method of comparing and judging two PT measurement values with each other, wherein one is an excitation PT measurement value, and the other is a meter PT measurement value or an excitation secondary voltage measurement value. The reliability of the excitation system is also improved along with the improvement of the reliability requirement of the power system on the system, and the detection of the PT disconnection fault and the fault control method adopted in the existing excitation system have certain limitations.
Therefore, in order to overcome the above drawbacks of the conventional devices, it is necessary to design an automatic excitation device PT disconnection fault detection unit that uses a method for mutual judgment between two groups of PT voltages and a single-phase PT voltage of a synchronous generator using a current of the generator as an auxiliary criterion.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide one kind and detect the automatic excitation device PT disconnection fault detection unit that judges each other between two sets of PT voltages of synchronous generator and single-phase PT voltage as supplementary criterion with the electric current of generator.
The utility model provides a its technical problem take following technical scheme to realize:
the utility model provides an automatic exciting arrangement's PT disconnection fault detection unit, includes to excite and uses terminal voltage transformer and instrument voltage transformer, excitation be connected with AD conversion module through first adaptation transformer with terminal voltage transformer, AD conversion module link to each other with microcontroller, instrument voltage transformer connect through third adaptation transformer microcontroller.
The voltage analog quantity measured by the terminal voltage transformer for excitation is transmitted to the AD conversion module through the transformation of the first adaptive transformer, and the AD conversion module converts the voltage analog quantity into a voltage digital quantity and transmits the voltage digital quantity to the microcontroller for data processing. And voltage signals measured by the voltage transformer for the instrument are directly transmitted to the microcontroller after being transformed by the third adaptive transformer.
Preferably, the PT disconnection fault detection unit of the automatic excitation device further includes a generator-side current transformer, and the generator-side current transformer is connected to the AD conversion module through a second adapter transformer.
The current analog quantity measured by the machine end current transformer is transmitted to the AD conversion module through the transformation of the second adaptive transformer, and the AD conversion module converts the current analog quantity into current digital quantity and transmits the current digital quantity to the microcontroller for data processing.
Preferably, the type of the microcontroller is DSP28335, and the D0-D13 pins of the AD conversion module are connected with the XD0-XD13 pins of the microcontroller through a data bus to establish a data transmission channel.
Preferably, the CS pin of the AD conversion module is further connected to the ADCS pin of the microcontroller, the RD pin of the AD conversion module is connected to the XRD pin of the microcontroller, the WR pin of the AD conversion module is connected to the XWE pin of the microcontroller, the CONVST pin of the AD conversion module is connected to the GPIO pin of the microcontroller, and the EOLC pin of the AD conversion module is connected to the XINT2 pin of the microcontroller.
A chip selection signal path is arranged between a CS pin of the AD conversion module and an ADCS pin of the microcontroller, a reading signal path is arranged between an RD pin and an XRD pin, a writing signal path is arranged between a WR pin and an XWE pin, a starting conversion path is arranged between a CONVST pin and a GPIO pin, and a conversion completion path is arranged between an EOLC pin and a XINT2 pin.
Preferably, a secondary side a of the terminal voltage transformer for excitation is connected to the CH6 pin of the AD conversion module through the first adapter transformer, a secondary side B of the terminal voltage transformer for excitation is connected to the CH5 pin of the AD conversion module through the first adapter transformer, and a secondary side C of the terminal voltage transformer for excitation is connected to the CH4 pin of the AD conversion module through the first adapter transformer.
Preferably, the voltage transformer for the instrument is connected with an ADCINA4 pin of the microcontroller through the third adapter transformer.
Preferably, the ADCREFIN pin of the microcontroller is connected with a reference source, and the reference source is a basic timing signal electronic component.
The reference source is mainly used for providing voltage comparison reference for AD conversion for the microcontroller.
The utility model has the advantages that:
the utility model discloses regard as supplementary criterion with synchronous generator's electric current, adopt the method of mutually judging between two sets of voltage transformer voltages of synchronous generator and single-phase voltage transformer voltage, judgement voltage transformer disconnection trouble that can be accurate. When a group of two groups of voltage transformers break, the two groups of voltage signals can be directly compared to detect the break fault of the voltage transformers, if the other group of voltage transformers break, the three single-phase voltage signals and the three single-phase current signals can be compared to detect the break of the voltage transformers, and meanwhile, the normal excitation function can be ensured when the line breaks.
Drawings
Fig. 1 is a schematic circuit structure diagram of the current measurement of the phase voltage and three-phase CT of the three-phase excitation PT of the present invention;
fig. 2 is a schematic diagram of the circuit structure of the three-phase average voltage measurement of the meter PT of the present invention;
FIG. 3 is a schematic diagram of the circuit logic for PT disconnection detection of the present invention;
fig. 4 is a schematic circuit logic diagram of the PT disconnection fault processing of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The embodiments of the present invention will be described in detail with reference to the accompanying drawings:
as shown in fig. 1 and 2, an automatic exciting arrangement's PT broken string fault detection unit, including for excitation terminal voltage transformer, instrument voltage transformer and terminal current transformer, for excitation terminal voltage transformer be connected with AD conversion module through first adapter transformer, AD conversion module link to each other with microcontroller, instrument voltage transformer connect through third adapter transformer microcontroller, terminal current transformer pass through second adapter transformer with AD conversion module link to each other. The current signal of the synchronous generator measured by the generator-end current transformer is used as an auxiliary criterion, the disconnection fault of the voltage transformer can be accurately judged, and the normal excitation function can be ensured when the line has a fault.
Furthermore, the model of the microcontroller is DSP28335, and the D0-D13 pins of the AD conversion module are connected with the XD0-XD13 pins of the microcontroller through a data bus to establish a data transmission channel. The CS pin of the AD conversion module is also connected with the ADCS pin of the microcontroller, the RD pin of the AD conversion module is connected with the XRD pin of the microcontroller, the WR pin of the AD conversion module is connected with the XWE pin of the microcontroller, the CONVST pin of the AD conversion module is connected with the GPIO pin of the microcontroller, and the EOLC pin of the AD conversion module is connected with the XINT2 pin of the microcontroller. The AD conversion module adopts conventional electronic devices in the prior art field to realize analog-to-digital conversion of current signals and voltage signals, and converts the voltage value measured by the generator-end voltage transformer for excitation and the analog quantity of the current value measured by the generator-end current transformer into the digital quantity read by the microcontroller.
Furthermore, a chip selection signal path is arranged between a CS pin of the AD conversion module and an ADCS pin of the microcontroller, a reading signal path is arranged between an RD pin and an XRD pin, a writing signal path is arranged between a WR pin and an XWE pin, a starting conversion path is arranged between a CONVST pin and a GPIO pin, and a conversion completion path is arranged between an EOLC pin and a XINT2 pin.
Further, a secondary side A of the terminal voltage transformer for excitation is connected with a CH6 pin of the AD conversion module through the first adapter transformer, a secondary side B of the terminal voltage transformer for excitation is connected with a CH5 pin of the AD conversion module through the first adapter transformer, and a secondary side C of the terminal voltage transformer for excitation is connected with a CH4 pin of the AD conversion module through the first adapter transformer. The voltage transformer for the instrument is connected with an ADCINA4 pin of the microcontroller through the third adapter transformer.
Furthermore, an ADCREFIN pin of the microcontroller is connected with a reference source, the reference source is a basic timing signal electronic element and is used for timing or inputting a pulse signal to the microcontroller, and the reference source adopts the existing electronic device and can achieve the basic timing function.
The secondary side three-phase voltage U measured by the terminal voltage transformer for excitationA、UB、UCReal part of
Imaginary part
Amplitude of voltage
Then calculate the average voltage U of its single phasePT1＝(UA+UB+UC)/3。
The secondary side three-phase current I measured by the machine end current transformerA、IB、ICReal part of
Imaginary part
Amplitude of current
Then calculating the average current I of the single phaseG＝(IA+IB+IC)/3。
As shown in fig. 3, the voltage transformer disconnection detection program is started by a 5 ms timed interrupt, and the measured value of the secondary side voltage of the synchronous generator is compared in the program to detect whether a voltage transformer disconnection fault occurs, and the detection method includes: (1) average voltage U of terminal voltage transformer for excitationPT1Lower than the average voltage U of the voltage transformer for the instrumentPT2When the voltage transformer is disconnected, the voltage transformer for excitation is disconnected; (2) average voltage U of voltage transformer for instrumentPT2Lower than average voltage U of terminal voltage transformer for excitationPT1When the voltage transformer is disconnected, the voltage transformer for excitation is disconnected; and (3) when one phase or two phases of the three-phase voltage of the excitation voltage transformer are low and the corresponding phase current does not have sudden change, the voltage transformer for excitation is disconnected.
In the attached drawings 1-4, excitation PT refers to an excitation terminal voltage transformer, terminal CT refers to a terminal current transformer, and instrument PT refers to an instrument voltage transformer.
In specific implementation, as shown in fig. 4, the fault type of the automatic excitation device is judged by calculating the three-phase voltage effective value of the terminal voltage transformer for excitation and comparing the voltage values of each phase, when the voltage transformer for excitation breaks down, the operation mode of the automatic excitation device is switched to a constant excitation current mode, if the standby channel is normal and has no fault, the automatic excitation device is switched to the standby channel to work, and when the voltage transformer for instrument breaks down, the voltage transformer for instrument gives a fault alarm.
The utility model discloses regard as supplementary criterion with synchronous generator's electric current, adopt the method of mutually judging between two sets of voltage transformer voltages of synchronous generator and single-phase voltage transformer voltage, judgement voltage transformer disconnection trouble that can be accurate. When a group of two groups of voltage transformers break, the two groups of voltage signals can be directly compared to detect the break fault of the voltage transformers, if the other group of voltage transformers break, the three single-phase voltage signals and the three single-phase current signals can be compared to detect the break of the voltage transformers, and meanwhile, the normal excitation function can be ensured when the line breaks.
It should be emphasized that the embodiments described herein are illustrative and not restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also falls within the scope of the present invention, in any other embodiments derived by those skilled in the art according to the technical solutions of the present invention.
Claims (7)
1. The utility model provides an automatic exciting arrangement's PT disconnection fault detection unit which characterized in that: including for excitation terminal voltage transformer and instrument voltage transformer, for excitation terminal voltage transformer be connected with AD conversion module through first adapter transformer, AD conversion module link to each other with microcontroller, instrument voltage transformer connect through third adapter transformer microcontroller.
2. The PT disconnection fault detection unit of an automatic excitation device according to claim 1, wherein: the power supply system also comprises a power supply terminal current transformer, wherein the power supply terminal current transformer is connected with the AD conversion module through a second adaptive transformer.
3. The PT disconnection fault detection unit of an automatic excitation device according to claim 1, wherein: the model of the microcontroller is DSP28335, and the D0-D13 pins of the AD conversion module are connected with the XD0-XD13 pins of the microcontroller through a data bus to establish a data transmission channel.
4. The PT disconnection fault detection unit of an automatic excitation device according to claim 3, wherein: the CS pin of the AD conversion module is also connected with the ADCS pin of the microcontroller, the RD pin of the AD conversion module is connected with the XRD pin of the microcontroller, the WR pin of the AD conversion module is connected with the XWE pin of the microcontroller, the CONVST pin of the AD conversion module is connected with the GPIO pin of the microcontroller, and the EOLC pin of the AD conversion module is connected with the XINT2 pin of the microcontroller.
5. The PT disconnection fault detection unit of an automatic excitation device according to claim 1, wherein: the secondary side A of the terminal voltage transformer for excitation is connected with the CH6 pin of the AD conversion module through the first adapter transformer, the secondary side B of the terminal voltage transformer for excitation is connected with the CH5 pin of the AD conversion module through the first adapter transformer, and the secondary side C of the terminal voltage transformer for excitation is connected with the CH4 pin of the AD conversion module through the first adapter transformer.
6. The PT disconnection fault detection unit of an automatic excitation device according to claim 1, wherein: the voltage transformer for the instrument is connected with an ADCINA4 pin of the microcontroller through the third adapter transformer.
7. The PT disconnection fault detection unit of an automatic excitation device according to claim 1, wherein: the ADCREFIN pin of the microcontroller is connected with a reference source, and the reference source is a voltage reference electronic element.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921533480.2U CN210835199U (en) | 2019-09-16 | 2019-09-16 | PT disconnection fault detection unit of automatic excitation device |
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| CN201921533480.2U CN210835199U (en) | 2019-09-16 | 2019-09-16 | PT disconnection fault detection unit of automatic excitation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111650542A (en) * | 2020-07-07 | 2020-09-11 | 国电大渡河瀑布沟发电有限公司 | Detection device and method for preventing slow fusing of generator set terminal voltage transformer fuse |
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2019
- 2019-09-16 CN CN201921533480.2U patent/CN210835199U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111650542A (en) * | 2020-07-07 | 2020-09-11 | 国电大渡河瀑布沟发电有限公司 | Detection device and method for preventing slow fusing of generator set terminal voltage transformer fuse |
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