CN106168638B - Method for realizing online monitoring of high-voltage parallel capacitor by using relay protection device - Google Patents
Method for realizing online monitoring of high-voltage parallel capacitor by using relay protection device Download PDFInfo
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- CN106168638B CN106168638B CN201610777347.6A CN201610777347A CN106168638B CN 106168638 B CN106168638 B CN 106168638B CN 201610777347 A CN201610777347 A CN 201610777347A CN 106168638 B CN106168638 B CN 106168638B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
Abstract
The invention relates to a method for realizing on-line monitoring of a high-voltage parallel capacitor by using a relay protection device, belonging to the field of operation monitoring and relay protection of the high-voltage parallel capacitor of a power system. The technical scheme is as follows: (1) measuring the current and the voltage of the high-voltage parallel capacitor in real time by utilizing the original function of the relay protection device; (2) the relay protection device executes the original relay protection function; (3) calculating the capacitance of the high voltage parallel capacitor using the measured current and voltage; (4) and according to the calculated capacitance value, comparing with a preset setting value to judge the health condition of the high-voltage parallel capacitor. The invention does not add any external accessory device, the online monitoring function of the high-voltage parallel capacitor and the relay protection device share a software and hardware platform, can realize the real-time calculation of the capacitance of the high-voltage parallel capacitor, the real-time evaluation of the health condition of the high-voltage parallel capacitor and can effectively improve the technical level of online monitoring of the high-voltage parallel capacitor.
Description
Technical Field
The invention relates to a method for realizing on-line monitoring of a high-voltage parallel capacitor by using a relay protection device, which is used for on-line monitoring of the high-voltage parallel capacitor and belongs to the field of operation monitoring and relay protection of the high-voltage parallel capacitor of a power system.
Background
The high-voltage parallel capacitor is used as an important reactive power supply and plays an important role in improving the structure of a power system and improving the quality of electric energy. The high-voltage parallel capacitor mainly comprises a capacitor core and a shell. The capacitor core is a complete whole formed by dozens of elements in a specified series and parallel connection mode, the shell is formed by bending and welding thin steel plates, the two ends of the shell are provided with supports for hoisting and mounting, and the shell cover is provided with a connecting terminal supported by a sleeve. The shell is filled with insulating liquid with excellent performance except the core.
The high-voltage parallel capacitor runs in a rated state for a long time, and factors such as harmonic waves, overvoltage and the like obviously damage the health condition of the high-voltage parallel capacitor. Meanwhile, with the use of the reactive voltage automatic control system, the switching of the high-voltage parallel capacitor is more frequent. The high-voltage parallel capacitor has high failure rate due to the severe operating environment. Because the high-voltage parallel capacitor is generally arranged on a low-voltage side bus of the transformer, the fault is equivalent to short circuit of a low-voltage outlet of the transformer, so that the transformer is influenced by large impact, and the safe operation of the transformer is not facilitated. Therefore, the health condition of the high-voltage parallel capacitor is accurately mastered in real time, and the urgent necessity of avoiding accidents is provided.
The failure of the high-voltage parallel capacitor generally evolves from the abnormality, failure, of individual ones of the internal series-parallel elements. When a single element in the high-voltage parallel capacitor is abnormal or failed, the change of the external electrical quantity is not large, and only the voltage born by other healthy elements in the high-voltage parallel capacitor is increased. As the operating time increases, other healthy series-parallel elements may continue to malfunction and fail due to the effects of poor operating conditions, eventually causing failure of the high-voltage parallel capacitor.
The detection method of the high-voltage parallel capacitor commonly used at present mainly comprises infrared diagnosis and capacitance test. The infrared temperature measurement diagnosis cannot effectively find the internal defects of the equipment. The capacitance detection belongs to a periodic power failure test. The test environment is different from the actual operation condition of the equipment, and the potential internal defects cannot be accurately reflected. Meanwhile, the test interval period is long, and the health condition of the high-voltage parallel capacitor cannot be mastered in real time.
With the development of the technology, an online monitoring method for the high-voltage parallel capacitor appears. The capacitance of the high-voltage parallel capacitor is measured and analyzed in real time, so that the health state of the high-voltage parallel capacitor can be mastered, abnormality and failure can be caused to internal elements of the parallel capacitor, an alarm can be given in time when the parallel capacitor does not fail, the phenomenon that the parallel capacitor fails to evolve finally is prevented, damage to high-voltage parallel capacitor equipment is avoided, and impact on a power system and other equipment is reduced. This is typically accomplished by mounting a feedthrough current transformer on the capacitor terminal sleeve for measuring the current flowing through the capacitor. A voltage transformer or a discharge coil is arranged between two pole terminals of the high-voltage parallel capacitor and is used for measuring the voltage between the two poles of the capacitor. The voltage and the current are transmitted to the calculation control unit in a wired or wireless mode. The calculation control unit calculates capacitance by using the measured voltage and current, and evaluates the health condition of the high-voltage parallel capacitor according to the capacitance change condition. The main disadvantage of this method is the addition of other accessories to the shunt reactor body. The accessory is easy to break down in the severe environment with high field intensity and high temperature, the overall maintenance amount of the equipment is increased, the distribution change of an electric field can be caused, and the normal operation of the high-voltage parallel capacitor is adversely affected. In another method, the health state of the high-voltage parallel capacitor is judged by calculating the capacitance of the high-voltage parallel capacitor by using the current and voltage data of the high-voltage parallel capacitor measured in the power dispatching SCACD system. The main disadvantage of the method is that the data in the power dispatching SCACD system is not real-time data, and the problems of different sampling periods of current and voltage exist.
A relay protection device for a high-voltage parallel capacitor is an automatic measure and equipment which can send out a warning signal to an operator on duty in time or directly send out a tripping command to a controlled circuit breaker to stop the development of events when the high-voltage parallel capacitor has faults to endanger the safe operation of a power system. In the existing relay protection device for the high-voltage parallel capacitor, the current flowing through the high-voltage parallel capacitor is measured in real time by using an installed current transformer, and the voltage between the two poles of the high-voltage parallel capacitor is measured in real time by using a voltage transformer installed on a bus or a discharge coil connected in parallel between the two poles of the high-voltage parallel capacitor. The characteristic that the current and the voltage quantity change when the high-voltage parallel capacitor fails is utilized, and the method that the comparative current exceeds a setting value or the differential pressure and the unbalanced voltage exceed the setting value is adopted to judge that the high-voltage parallel capacitor fails, so that a tripping command is sent to a controlled breaker to remove the failure. At present, high-voltage parallel capacitor relay protection devices used at home and abroad do not have the function of on-line monitoring.
Disclosure of Invention
The invention aims to add the functions of online monitoring of a corresponding circuit board and software of a high-voltage parallel capacitor in a high-voltage parallel capacitor relay protection device without adding any external auxiliary device, measure current and voltage data in real time by utilizing an original current and voltage input loop of the relay protection device, calculate capacitance in real time, complete state evaluation of the high-voltage parallel capacitor, and complete transmission of relevant information to a transformer substation monitoring system and a dispatching end regulation and control system through the communication function of the relay protection device. Therefore, the on-line monitoring function of the high-voltage parallel capacitor is realized simply, efficiently and perfectly, the fault trend of the high-voltage parallel capacitor is found in time, and the problems in the background art are solved.
The purpose of the invention is realized by the following technical scheme:
a method for realizing on-line monitoring of a high-voltage parallel capacitor by using a relay protection device comprises the following steps: (1) measuring the current and the voltage of the high-voltage parallel capacitor in real time by utilizing the original function of the relay protection device; (2) the relay protection device executes the original relay protection function; (3) calculating the capacitance of the high-voltage parallel capacitor by using the measured current and voltage; (4) according to the calculated capacitance value, the health condition of the high-voltage parallel capacitor is judged by comparing the calculated capacitance value with a preset setting value; (5) and the relevant judgment conclusion is displayed through a human-computer interaction module of the relay protection device and is uploaded to the monitoring system and the regulating and controlling system through the communication function of the relay protection device.
The utilization of the original functions of the relay protection device means that the online monitoring function module is realized based on the original software and hardware platform of the relay protection device, and no hardware equipment, no external loop or accessory equipment is added; the real-time measurement of the current and the voltage of the high-voltage parallel capacitor is realized by utilizing a voltage-current converter, an A/D conversion element, a sampling element and a CPU element which are arranged in a relay protection device.
The method for judging the health condition of the high-voltage parallel capacitor by comparing the calculated capacitance value with a preset setting value means that the capacitance setting value and a deviation allowable value of the high-voltage parallel capacitor are set in advance, the capacitance preset setting value adopts a capacitance measured value in a power failure test, and the deviation allowable value is matched with the measurement precision of a relay protection device and keeps a proper margin; when the deviation between the calculated capacitance value and the capacitance setting value is smaller than a deviation allowable value, judging that the health condition of the high-voltage parallel capacitor is normal; and when the deviation between the calculated capacitance value and the capacitance setting value exceeds a deviation allowable value, judging that the health condition of the high-voltage parallel capacitor is abnormal.
The invention has the positive effects that: the method for realizing the on-line monitoring of the high-voltage parallel capacitor by using the relay protection device does not increase any external accessory device, the on-line monitoring function of the high-voltage parallel capacitor and the relay protection device share a software and hardware platform, the capacitance of the high-voltage parallel capacitor can be calculated in real time, the health condition of the high-voltage parallel capacitor can be evaluated in real time, the method has obvious advantages in cost and function compared with the prior art, and the technical level of the on-line monitoring of the high-voltage parallel capacitor can be effectively improved.
Drawings
FIG. 1 is a functional schematic diagram of an embodiment of the present invention, which uses a relay protection device to implement online monitoring of a high-voltage parallel capacitor;
in the figure: the system comprises a relay protection device 1, a current and voltage acquisition and calculation module 2, a relay protection function module 3, an online monitoring function module 4, a human-computer interaction module 5, a communication module 6, a voltage transformer 7, a discharge coil 8, a current transformer 9, a monitoring system and a regulation and control system 10;
FIG. 2 is a schematic diagram of the wiring of a high voltage parallel capacitor, the voltage being taken from the discharge coil;
in the figure: a discharge coil 8, a current transformer 9, a high-voltage parallel capacitor 11 and a series reactor 12;
FIG. 3 is a schematic diagram of a high voltage shunt capacitor wiring scheme with voltage taken from a voltage transformer;
in the figure: a voltage transformer 7, a current transformer 9, a high-voltage parallel capacitor 11 and a series reactor 12.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings.
In the first step, a voltage transformer 7 or a discharge coil 8 collects and outputs a voltage analog quantity U to the relay protection device 1. The current transformer 9 collects and outputs the current analog quantity I to the relay protection device 1.
And secondly, calculating to obtain the current and voltage measured values of the high-voltage parallel capacitor by the relay protection device 1 by using the current and voltage acquisition and calculation module 2.
And step three, the relay protection device 1 executes the original relay protection function through the relay protection function module 3.
And fourthly, the relay protection device 1 calculates the capacitance of the parallel capacitor by using the current and voltage measured values of the high-voltage parallel capacitor obtained in the second step through the online monitoring function module 4.
For the wiring shown in fig. 2, the voltage is taken from the discharge coil 8. The formula for calculating the capacitance is shown in formula (1), wherein f is frequency, I is current, and U is voltage.
For the wiring scheme shown in fig. 3, the voltage is taken from a voltage transformer 7. The formula for calculating the capacitance is shown in formula (2), wherein f is frequency, I is current, U is voltage, and L is series reactor inductance.
And fifthly, the online monitoring function module 4 judges the health condition of the high-voltage parallel capacitor by comparing the calculated capacitance value with a preset setting value. In the on-line monitoring function module 4, a capacitance setting value and an allowable deviation value of the high-voltage parallel capacitor are preset in advance. The preset capacitance value is generally a capacitance measurement value in a power failure test, and the deviation allowable value needs to comprehensively consider the measurement precision factor of the relay protection device and reserve a proper margin. And when the deviation between the calculated capacitance value and the capacitance setting value is smaller than the deviation allowable value, judging that the health condition of the high-voltage parallel capacitor is normal. And when the deviation between the calculated capacitance value and the capacitance setting value is larger than the deviation allowable value, judging that the health condition of the high-voltage parallel capacitor is abnormal.
And sixthly, the health condition of the high-voltage parallel capacitor obtained by the on-line monitoring functional module 4 is displayed through a human-computer interaction module 5 of the relay protection device and is sent to a monitoring system and a regulation and control system 10 through a communication module 6 of the relay protection device. And then returning to the first step, and circulating the first step to the sixth step under the condition of no external interruption.
While the invention has been described with reference to specific preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (5)
1. A method for realizing on-line monitoring of a high-voltage parallel capacitor by using a relay protection device is characterized by comprising the following steps: (1) the current and the voltage of the high-voltage parallel capacitor (11) are measured in real time by utilizing the original function of the relay protection device (1); (2) the relay protection device executes the original relay protection function; (3) calculating the capacitance of the high-voltage parallel capacitor by using the measured current and voltage; (4) according to the calculated capacitance value, the health condition of the high-voltage parallel capacitor is judged by comparing the calculated capacitance value with a preset setting value; (5) and the related judgment conclusion is displayed through a human-computer interaction module of the relay protection device and is uploaded to a monitoring system and a regulation and control system (10) through the communication function of the relay protection device.
2. The method for realizing the on-line monitoring of the high-voltage parallel capacitor by using the relay protection device according to claim 1, wherein the method comprises the following steps: the utilization of the original functions of the relay protection device means that the online monitoring function module (4) is realized based on the original software and hardware platform of the relay protection device, and no hardware equipment, no external loop or accessory equipment is added; the real-time measurement of the current and the voltage of the high-voltage parallel capacitor is realized by utilizing a voltage-current converter, an A/D conversion element, a sampling element and a CPU element which are arranged in a relay protection device.
3. The method for realizing the on-line monitoring of the high-voltage parallel capacitor by using the relay protection device according to claim 1 or 2, wherein the method comprises the following steps: the method comprises the steps that the health condition of the high-voltage parallel capacitor is judged by comparing a calculated capacitance value with a preset setting value, namely, the capacitance setting value and a deviation allowable value of the high-voltage parallel capacitor are set in advance, the capacitance preset setting value adopts a capacitance measured value in a power failure test, and the deviation allowable value is matched with the measurement precision of a relay protection device and keeps a proper margin; when the deviation between the calculated capacitance value and the capacitance setting value is smaller than a deviation allowable value, judging that the health condition of the high-voltage parallel capacitor is normal; and when the deviation between the calculated capacitance value and the capacitance setting value exceeds a deviation allowable value, judging that the health condition of the high-voltage parallel capacitor is abnormal.
4. The method for realizing the on-line monitoring of the high-voltage parallel capacitor by using the relay protection device according to claim 1 or 2, wherein the method comprises the following steps: the capacitance of the high-voltage parallel capacitor is calculated by using the measured current and voltage, namely the capacitance is suitable for the situation that the voltage is taken from the discharge coil (8), the capacitance is also suitable for the situation that the discharge coil does not provide the voltage and needs to obtain the voltage from the voltage transformer (7), namely the capacitance is suitable for the situation without a series reactor (12), and the capacitance is also suitable for the situation with the series reactor.
5. The method for realizing the on-line monitoring of the high-voltage parallel capacitor by using the relay protection device according to claim 1 or 2, characterized in that: the relevant judgment conclusion is displayed through a human-computer interaction module (5) of the relay protection device and uploaded to a monitoring system and a regulating and controlling system (10) through the communication function of the relay protection device, the in-situ display of the online monitoring result and the uploading of the in-situ display to the monitoring system and the regulating and controlling system are achieved based on the original communication function of the relay protection device, and devices and communication channels do not need to be added.
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| CN106168638B true CN106168638B (en) | 2022-11-22 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107464692B (en) * | 2017-08-03 | 2023-01-17 | 无锡市电力滤波有限公司 | Relay protection device and method for dry-type high-voltage self-healing parallel capacitor |
| WO2019043828A1 (en) * | 2017-08-30 | 2019-03-07 | 三菱電機株式会社 | Capacitor capacitance measurement device and electric power instrument |
| CN108710040A (en) * | 2018-05-28 | 2018-10-26 | 国网河北省电力有限公司衡水供电分公司 | Shunt capacitor is protected and monitoring integration method |
| CN109406883A (en) * | 2018-12-27 | 2019-03-01 | 日新电机（无锡）有限公司 | A kind of Assembled high-voltage shunted capacitor device and power equipment |
| TWI693768B (en) * | 2019-02-18 | 2020-05-11 | 英捷力電機股份有限公司 | Method for monitoring capacitance value of capacitor in power system |
| CN109884436B (en) * | 2019-03-19 | 2021-07-06 | 国网山东省电力公司淄博供电公司 | Online monitoring method for power capacitor complete equipment |
| CN110514994A (en) * | 2019-09-04 | 2019-11-29 | 甘书宇 | A kind of high-voltage AC breaker is restriked the method for on-line monitoring |
| CN115343565B (en) * | 2022-10-19 | 2023-01-24 | 广东电网有限责任公司佛山供电局 | Method and device for evaluating health state of parallel capacitor in real time |
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| SE0004428D0 (en) * | 2000-12-01 | 2000-12-01 | Abb Ab | Protective equipment for a series capacitor plant |
| WO2014090018A1 (en) * | 2012-12-12 | 2014-06-19 | 天津市电力公司 | Iec61850 standard-based intelligent power distribution terminal |
| CN105098725A (en) * | 2014-05-12 | 2015-11-25 | 北京诺德威电力技术开发有限责任公司 | Reactive compensation device protecting method and reactive compensation device protecting system |
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| SE0004428D0 (en) * | 2000-12-01 | 2000-12-01 | Abb Ab | Protective equipment for a series capacitor plant |
| WO2014090018A1 (en) * | 2012-12-12 | 2014-06-19 | 天津市电力公司 | Iec61850 standard-based intelligent power distribution terminal |
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