CN111650542A - Detection device and method for preventing slow fusing of generator set terminal voltage transformer fuse - Google Patents
Detection device and method for preventing slow fusing of generator set terminal voltage transformer fuse Download PDFInfo
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/74—Testing of fuses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a slow-fusing prevention detection device for a generator-end voltage transformer fuse, wherein an analog-to-digital (AD) conversion module consists of an analog quantity switching module and an AD converter, the acquisition module is used for respectively acquiring three-phase voltage signals of the generator-end voltage transformer, the output end of the acquisition module is connected with the signal input end of the analog quantity switching module, the analog quantity switching module is used for converting the voltage signals through the AD converter and then inputting the converted voltage signals into a single chip microcomputer, and the signal output end of the single chip microcomputer is in electric signal connection with an output relay. Compared with the prior art, the method can monitor the working state of the fuse of the terminal voltage transformer in real time, can quickly and accurately position the fault under the fault condition, saves time for fault processing of operators, and effectively ensures the operation safety of equipment. Meanwhile, signals of the device directly come from the secondary side of the voltage transformer at the outlet of the unit, and the device state analysis and diagnosis are carried out after logical operation and judgment, so that the fault judgment is quick and accurate, and the alarm function is reliable.
Description
Technical Field
The invention relates to the industry of large-scale power plants, in particular to a slow-fusing prevention detection device and method for a generator set terminal voltage transformer fuse.
Background
Terminal voltage transformer function
A large-scale generator set is provided with a generator terminal voltage transformer for monitoring the voltage of a generator stator, and 3 groups of voltage transformers are arranged at a general generator terminal and are named as 1YH, 2YH and 3YH respectively.
The terminal voltage transformer is mainly used for the following systems:
1. a speed regulator system: the system provides a terminal voltage (residual voltage) signal for a speed regulator system, is used for measuring the residual voltage frequency of the speed regulator, and provides a stable unit frequency signal source for the functions of starting and stopping the speed regulator system, regulating the frequency, shedding the load, regulating the primary frequency and the like.
2. An excitation system: the voltage signal source is used for providing a terminal voltage signal for an excitation system, and is used for excitation, inversion, AVR control, PSS control and the like of the excitation system.
3. The generator protection is a voltage signal source for protecting the generator from loss of excitation, loss of step, overvoltage, fixed value grounding, error power-on and the like.
4. The measurement system comprises: the voltage signal source is provided for a computer monitoring system, a unit electric energy acquisition system, a synchronous device, a PMU, a fault recording system and other measurement systems and instruments.
(II) terminal high-voltage fuse function
1. In order to ensure the safety of the terminal voltage transformer and the related secondary circuit, a high-voltage fuse is usually arranged between the terminal voltage transformer and the primary equipment, so that the high-voltage fuse can be quickly fused when the primary equipment is in short circuit and grounded, and the related circuit and the voltage transformer are protected.
2. The high-voltage fuse is also called high-sectionalized capacity fuse, and has the characteristics of large current breaking capacity and obvious current limiting effect, and most of melts of the high-voltage fuse are wound on a ceramic seven-star column framework for supporting. Two end points of the melt wound on the ceramic seven-star column framework are welded on the end cover, then the melt is arranged in the insulating shell and welded with the inner cap, the outer cap is tightly matched with the inner cap through extrusion, and the outer surface of the outer cap is plated with silver or tin to prevent atmospheric corrosion.
3. The action of the high-voltage fuse is realized by fusing of a melt (fuse wire), and the action current and the action time of the high-voltage fuse have obvious characteristics in seconds, namely, the fusing time is long when the overload current is small, and the fusing time is short when the overload current is large.
(III) consequences of slow or instantaneous blow-out of high-voltage fuses
1. When the high-voltage fuse is slowly fused (the transition process of the high-voltage fuse from a normal state to a fused state) or instantly fused, the secondary voltage of the connected terminal voltage transformer is obviously reduced, but the fused state of the fuse has great influence on the connected secondary equipment.
2. The speed regulator system leads to voltage signal acquisition abnormity because of fusing of a fuse of a terminal voltage transformer, the frequency of the speed regulator system fluctuates, the primary frequency modulation function of the unit is affected, the unit can not accurately follow the system action, and the unit can be twitched in severe cases.
3. The excitation system cannot accurately track the terminal voltage due to the fact that a fuse of a terminal voltage transformer of the excitation system is fused, and the unit is possibly forced to be excited by mistake.
4. The generator protection device may cause misoperation on protection which requires a voltage signal as a judgment condition due to fusing of a fuse of a terminal voltage transformer; the abnormal voltage signal of the synchronous device can cause the abnormal grid connection of the unit, and when the voltage of the electric energy collection is abnormal, huge economic loss is directly brought to the electric energy collection of the power plant.
At present, the working conditions of fuses of most power plant unit outlet voltage transformers can only be judged by comprehensively comparing and carrying out field measurement on equipment such as a fault recording device, a protection device and an excitation system of a secondary voltage acquisition system, which is very troublesome, and the fault positioning time is greatly increased. Therefore, a device for rapidly detecting whether a high-voltage fuse of a terminal voltage transformer is fused or not or whether the high-voltage fuse is fused or not is needed, and when the fuse is about to be fused or is instantly fused, an operator can be immediately reminded to perform equipment inspection and processing.
Disclosure of Invention
The invention aims to provide a detection device which solves the problems and is specially used for detecting the slow-fusing prevention of a generator unit terminal voltage transformer fuse.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a generating set terminal voltage transformer fuse prevents slow melting detection device, includes collection module, power conditioning module, AD analog to digital conversion module, singlechip and the relay of opening, AD analog to digital conversion module comprises analog quantity switching module and AD converter, collection module gathers terminal voltage transformer three-phase voltage signal respectively, collection module's output and analog quantity switching module's signal input part are connected, analog quantity switching module inputs the singlechip with voltage signal after AD converter conversion, the signal output part and the relay electric signal connection of opening of singlechip, power conditioning module is connected with the monolithic is electromechanical.
Preferably, the acquisition module adopts a 9-path voltage acquisition circuit.
Preferably, the analog quantity switching module adopts 8-way input CD4051BM96 AI.
4 preferably, the model of the single chip microcomputer is STC15F60S 2.
Preferably, the open relay is composed of a solid-state relay, and the signal is sent out after the operation result of the single chip microcomputer is acted through a normally open node of the solid-state relay.
Preferably, the power conditioning module supplies power to the single chip microcomputer, and the power conditioning module rectifies the input AC220V voltage into direct current after passing through an isolation transformer, and converts the direct current into +/-5V power supply voltage after voltage reduction and filtering.
A detection method for preventing slow fusing of a generator-end voltage transformer fuse comprises the steps that phase voltage signals of 1YH, 2YH and 3YH of the generator-end voltage transformer are respectively collected through a collection module, a single chip microcomputer respectively compares and calculates three-phase voltages Ua, Ub and Uc of each YH, logic configuration is carried out, whether the fuse is slow fusing or fusing is judged, then an alarm signal is sent out through an outgoing relay, and the alarm signal is sent to a monitoring system.
Preferably, the logic judgment method for slow fusing or fusing of the single-phase fuse is carried out,
a. firstly, converting the collected secondary phase voltage signal of the generator-end voltage transformer into a per-unit value;
b. judging a low-voltage transformer through a voltage 'two-out-of-three' judgment logic of a terminal voltage transformer;
c. simultaneously reducing the three-phase voltage of the same YH to judge that the unit excitation system is withdrawn, and locking to alarm;
d. judging whether a single-phase ground fault occurs or not by using the change conditions of the same phase voltage of 1YH, 2YH and 3YH, and locking to alarm;
e. in order to prevent the fusing logic misjudgment of the single-phase fuse caused by the simultaneous fusing of the two phase fuses, the normal criterion of the other two phase fuses is added in the single-phase fusing judgment;
d. the delay function is added to the above judgment logics.
Preferably, the logic judgment method for simultaneously and slowly melting or fusing the two-phase fuses is carried out,
a. firstly, converting the collected secondary phase voltage signal of the generator-end voltage transformer into a per-unit value;
b. and judging the low-voltage transformer through the judgment logic of 'three-out-of-two' of the voltages of the three voltage transformers at the terminal.
Preferably, a logic judgment method for simultaneously and slowly melting or fusing three-phase fuses is carried out,
a. firstly, converting the collected secondary phase voltage signal of the generator-end voltage transformer into a per-unit value;
b. and judging the low-voltage transformer through the judgment logic of 'three-out-of-two' of the voltages of the three voltage transformers at the terminal.
Compared with the prior art, the invention has the advantages that: the invention can monitor the working state of the fuse of the terminal voltage transformer in real time in the operation process of the large-scale generator set, quickly and accurately locate the fault under the fault condition, save time for fault processing of operators, avoid fault expansion and effectively ensure the operation safety of equipment. Meanwhile, signals of the device directly originate from the secondary side of the voltage transformer at the outlet of the unit, and the device state analysis and diagnosis are carried out after logical operation and judgment, so that the fault judgment is quick and accurate, the alarm function is reliable, and the device has high popularization.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a schematic circuit diagram of the inventive open relay;
fig. 3 is a schematic circuit diagram of the power conditioning module of the present invention.
Detailed Description
The present invention will be further explained below.
Example (b): referring to fig. 1, a detection device for preventing slow fuse of a generator set terminal voltage transformer fuse comprises an acquisition module, a power conditioning module, an AD analog-to-digital conversion module, a single chip microcomputer and a switch-out relay, wherein the AD analog-to-digital conversion module is composed of an analog quantity switching module and an AD converter, the acquisition module acquires three-phase voltage signals of the generator terminal voltage transformer respectively, the output end of the acquisition module is connected with the signal input end of the analog quantity switching module, the analog quantity switching module converts the voltage signals into the single chip microcomputer through the AD converter, the signal output end of the single chip microcomputer is in electrical signal connection with the switch-out relay, and the power conditioning module is electrically connected with the single chip microcomputer.
The working process is as follows: the acquisition module is used for acquiring phase voltage signals of terminal voltage transformers 1YH, 2YH and 3YH respectively, introducing the acquired signals into the analog quantity switching module, selecting and switching lines by the analog quantity switching module, converting corresponding voltage signals into analog quantity data by an AD converter, inputting the analog quantity data into the single chip microcomputer, performing slow-melting prevention detection by the single chip microcomputer, and outputting and alarming detection results by an output relay.
The acquisition module adopts 9 way voltage acquisition circuits, the analog quantity switching module adopts 8 ways of CD4051BM96AI analog quantity switching module of input to form with the AD converter cooperation and uses, converts the terminal voltage analog signal into digital signal and supplies the singlechip program to gather the operation. Because the 9-path acquisition is adopted, the analog quantity switching module with 8-path input is not enough, and two analog quantity switching modules are connected in series for use in view of cost.
The single chip microcomputer is used as a hardware operation core component of the slow-melting prevention detection device, the model is STC15F60S2, collected digital quantity signals of terminal phase voltages are converted into analog quantity data again, and the slow-melting prevention detection function is completed through set program calculation logic. .
The opening relay, namely the DO opening part, is composed of a solid-state relay, and a signal is sent out for alarming after the operation result of the single chip microcomputer acts through a normally open node of the solid-state relay, and a specific circuit schematic diagram is shown in figure 2.
The power supply conditioning module supplies power to the single chip microcomputer, the power supply conditioning module rectifies input AC220V voltage into direct current after passing through an isolation transformer, and converts the direct current into +/-5V power supply voltage after voltage reduction and filtering, and a specific circuit schematic diagram is shown in FIG. 3.
On the basis of primary voltage acquisition equipment and secondary signal acquisition of the conventional generator set of the power plant, the operation condition of the fuse of the generator-side voltage transformer is accurately judged by acquiring the conventional generator-side three-phase voltage signals and performing program logic operation. The scheme does not change the primary equipment structure of the power plant, is convenient to wire, convenient to install, simple in implementation mode, simple in program logic scheme and low in capital and labor cost investment. The fuse running state real-time online monitoring and fault diagnosis alarm of the terminal outlet voltage transformer of the large generator set are realized, the fuse real-time monitoring function of the terminal voltage transformer is effectively realized, the fault is quickly and accurately positioned under the condition of equipment fault, the time is saved for fault treatment of operators, and the fault expansion is avoided.
A method for detecting slow fusing prevention of a large-scale generator set terminal voltage transformer fuse is characterized in that a set of slow fusing prevention monitoring device is designed and configured, voltage signals of voltages of 1YH, 2YH and 3YH of the generator terminal voltage transformer are respectively collected through a collection module, a single chip microcomputer respectively compares and calculates three-phase voltages Ua, Ub and Uc of each YH, logic configuration is carried out, whether the fuse is in slow fusing or fusing is judged, then an alarm signal is sent out through an outgoing relay, and the alarm signal is sent to a monitoring system. The requirement logic judgment can effectively lock the alarm signal under the abnormal condition that the machine end voltage is influenced by faults such as machine set excitation quit, single-phase grounding and the like.
Table 1 logical variable corresponds to the device number table:
| name of variable | Device | Name of variable | Device | Name of variable | Device |
| Ua1 | 1YH A phase Voltage | Ub1 | 1YH B phase Voltage | Uc1 | 1YH C phase Voltage |
| Ua2 | 2YH A phase Voltage | Ub2 | 2YH B phase Voltage | Uc2 | 2YH C phase Voltage |
| Ua3 | 3YH A phase Voltage | Ub3 | 3YH B phase Voltage | Uc3 | 3YH C phase Voltage |
Firstly, a logic judgment method for slow fusing or fusing of a single-phase fuse is carried out,
a. firstly, converting the collected secondary phase voltage signal of the terminal voltage transformer into per unit values, respectively expressing the per unit values by percentage, improving the accuracy, ensuring that the data sampling is accurate to 0.1 percent,
b. judging a low-voltage transformer through a voltage 'two-out-of-three' judgment logic of a terminal voltage transformer;
c. simultaneously reducing the three-phase voltage of the same YH to judge that the unit excitation system is withdrawn, and locking to alarm;
d. judging whether a single-phase ground fault occurs or not by using the change conditions of the same phase voltage of 1YH, 2YH and 3YH, and locking to alarm;
e. in order to prevent the fusing logic misjudgment of the single-phase fuse caused by the simultaneous fusing of the two phase fuses, the normal criterion of the other two phase fuses is added in the single-phase fusing judgment;
d. the instability of data of the device sampling AD conversion is considered, the anti-jitter function is added, and the delay function is added in the judgment logic.
The specific logic is as follows, taking 1YH as an example:
1YH A phase determination logic:
1YH B phase determination logic:
1YH C phase determination logic:
logic for simultaneous slow fusing or fusing of two-phase fuses
a. Firstly, converting the collected secondary phase voltage signal of the terminal voltage transformer into per unit values, respectively expressing the per unit values by percentage, improving the accuracy, ensuring that the data sampling is accurate to 0.1 percent,
b. and judging the low-voltage transformer through the judgment logic of 'three-out-of-two' of the voltages of the three voltage transformers at the terminal.
The specific logic is as follows, taking 1YH as an example:
1YH AB phase determination logic:
1YH BC phase determination logic:
1YH AC phase determination logic:
logic for the simultaneous slow fusing or blowing of the three-phase fuses,
a. firstly, converting the collected secondary phase voltage signal of the terminal voltage transformer into per unit values, respectively expressing the per unit values by percentage, improving the accuracy, ensuring that the data sampling is accurate to 0.1 percent,
b. and judging the low-voltage transformer through the judgment logic of 'three-out-of-two' of the voltages of the three voltage transformers at the terminal.
The specific logic is as follows, taking 1YH as an example:
the device and the method for detecting slow-fusing prevention of the fuse of the generator-side voltage transformer provided by the invention are described in detail, a specific example is applied in the description to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; while the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a generating set terminal voltage transformer fuse prevents melting detection device slowly which characterized in that: including collection module, power conditioning module, AD analog-to-digital conversion module, singlechip and the relay of opening, AD analog-to-digital conversion module comprises analog quantity switching module and AD converter, collection module gathers terminal voltage transformer three-phase voltage signal respectively, collection module's output is connected with analog quantity switching module's signal input part, analog quantity switching module inputs the singlechip with voltage signal after AD converter conversion, the signal output part of singlechip with open relay electric signal connection, power conditioning module is connected with the monolithic is electromechanical.
2. The slow-fusing prevention detection device for the fuse of the generator set terminal voltage transformer of claim 1, characterized in that: the acquisition module adopts 9 voltage acquisition circuits.
3. The slow-fusing prevention detection device for the fuse of the generator set terminal voltage transformer of claim 1, characterized in that: the analog quantity switching module adopts 8-path input CD4051BM96 AI.
4. The slow-fusing prevention detection device for the fuse of the generator set terminal voltage transformer of claim 1, characterized in that: the model of the single chip microcomputer is STC15F60S 2.
5. The slow-fusing prevention detection device for the fuse of the generator set terminal voltage transformer of claim 1, characterized in that: the open relay is composed of a solid-state relay, and the signal is sent out after the operation result of the single chip microcomputer acts through a normally open node of the solid-state relay.
6. The slow-fusing prevention detection device for the fuse of the generator set terminal voltage transformer of claim 1, characterized in that: the power supply conditioning module supplies power to the single chip microcomputer, and the power supply conditioning module rectifies input AC220V voltage into direct current after passing through an isolation transformer, and converts the direct current into +/-5V power supply voltage after voltage reduction and filtering.
7. The detection method for preventing slow fusing of the fuse of the generator set terminal voltage transformer according to claim 1, is characterized in that: the voltage signals of the voltage transformers 1YH, 2YH and 3YH at the generator end are respectively collected through a collection module, the three-phase voltages Ua, Ub and Uc of each YH are respectively compared and calculated with each other through a single chip microcomputer, logic configuration is carried out, whether the fuse is in slow fusing or fusing is judged, and then an alarm signal is sent to a monitoring system through an outgoing relay.
8. The detection method for preventing slow fusing of the fuse of the generator set terminal voltage transformer of claim 7 is characterized in that: a logic judgment method for slow fusing or fusing of the single-phase fuse is carried out,
a. firstly, converting the collected secondary phase voltage signal of the generator-end voltage transformer into a per-unit value;
b. judging a low-voltage transformer through a voltage 'two-out-of-three' judgment logic of a terminal voltage transformer;
c. simultaneously reducing the three-phase voltage of the same YH to judge that the unit excitation system is withdrawn, and locking to alarm;
d. judging whether a single-phase ground fault occurs or not by using the change conditions of the same phase voltage of 1YH, 2YH and 3YH, and locking to alarm;
e. in order to prevent the fusing logic misjudgment of the single-phase fuse caused by the simultaneous fusing of the two phase fuses, the normal criterion of the other two phase fuses is added in the single-phase fusing judgment;
d. the delay function is added to the above judgment logics.
9. The detection method for preventing slow fusing of the fuse of the generator set terminal voltage transformer of claim 8, is characterized in that: a logic judgment method for simultaneously and slowly fusing or fusing two phase fuses is carried out,
a. firstly, converting the collected secondary phase voltage signal of the generator-end voltage transformer into a per-unit value;
b. and judging the low-voltage transformer through the judgment logic of 'three-out-of-two' of the voltages of the three voltage transformers at the terminal.
10. The detection method for preventing slow fusing of the fuse of the generator set terminal voltage transformer of claim 8, is characterized in that: a logic judgment method for simultaneously slowly melting or fusing three-phase fuses is carried out,
a. firstly, converting the collected secondary phase voltage signal of the generator-end voltage transformer into a per-unit value;
b. and judging the low-voltage transformer through the judgment logic of 'three-out-of-two' of the voltages of the three voltage transformers at the terminal.
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Cited By (2)
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| CN112881906A (en) * | 2021-01-04 | 2021-06-01 | 国家能源集团国源电力有限公司 | Fault judgment method and device and control terminal |
| CN113721181A (en) * | 2021-08-04 | 2021-11-30 | 华能汕头海门发电有限责任公司 | Self-shunt excitation PT slow-fusing fault judgment method |
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Address after: 625300 shangshaba, wusihe Town, Hanyuan County, Ya'an City, Sichuan Province Applicant after: Guoneng Dadu River Pubugou Power Generation Co.,Ltd. Address before: 625300 shangshaba, wusihe Town, Hanyuan County, Ya'an City, Sichuan Province Applicant before: GUODIAN DADU RIVER PUBUGOU POWER GENERATION Co.,Ltd. |
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Application publication date: 20200911 |