CN106168638A - A kind of method utilizing protective relaying device to realize high-voltage parallel capacitor on-line monitoring - Google Patents
A kind of method utilizing protective relaying device to realize high-voltage parallel capacitor on-line monitoring Download PDFInfo
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- CN106168638A CN106168638A CN201610777347.6A CN201610777347A CN106168638A CN 106168638 A CN106168638 A CN 106168638A CN 201610777347 A CN201610777347 A CN 201610777347A CN 106168638 A CN106168638 A CN 106168638A
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- G—PHYSICS
- 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
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Abstract
The present invention relates to a kind of method utilizing protective relaying device to realize high-voltage parallel capacitor on-line monitoring, belong to power system high-voltage parallel capacitor operational monitoring and relay protection field.Technical scheme is: 1. utilize the original function of protective relaying device to measure electric current and the voltage of high-voltage parallel capacitor in real time；2. protective relaying device performs original relay protection function；3. utilize and measure the electric current arrived and the capacitance of voltage calculating high-voltage parallel capacitor；4. according to calculated capacitance value, by comparing with default setting valve, it is determined that the health status of high-voltage parallel capacitor.The present invention does not increase any external attached device; high-voltage parallel capacitor on-line monitoring function and protective relaying device share hardware and software platform; it is capable of calculating in real time the capacitance of high-voltage parallel capacitor; the health status of Real-Time Evaluation high-voltage parallel capacitor, can promote the technical merit of high-voltage parallel capacitor on-line monitoring effectively.
Description
Technical field
The present invention relates to a kind of method utilizing protective relaying device to realize high-voltage parallel capacitor on-line monitoring, for right
High-voltage parallel capacitor carries out on-line monitoring, belongs to power system high-voltage parallel capacitor operational monitoring and relay protection field.
Background technology
High-voltage parallel capacitor is as a kind of important reactive power source, for improving NETWORK STRUCTURE PRESERVING POWER SYSTEM, improves electric energy matter
Amount has important effect.High-voltage parallel capacitor is mainly made up of capacitance core and shell.Capacitance core is pressed rule by dozens of element
Fixed series and parallel mode forms a complete entirety, and shell is welded into by sheet metal is curved, and two ends are equipped with propping up of installing for handling
Frame, equipped with the binding post with collar supports on cap.The outer iknsulating liquid being full of function admirable of son is decored in shell.
High-voltage parallel capacitor runs in rated condition for a long time, and its health status is had bright by the factor such as harmonic wave, overvoltage
Aobvious infringement.Simultaneously along with the use of Powerless voltage automatic control system, the switching of high-voltage parallel capacitor is the most frequent.Badly
Running environment cause high-voltage parallel capacitor fault rate higher.Owing to high-voltage parallel capacitor is typically located in transformator low
Pressure side bus, is equivalent to transformator mesolow terminal short-circuit, greater impact can be caused to affect transformator, be unfavorable for during its fault
The safe operation of transformator.Therefore in real time, the health status of accurate assurance high-voltage parallel capacitor, it is to avoid accident has non-
The most urgent necessity.
The fault of high-voltage parallel capacitor be usually abnormal, the fault of Individual elements from internal connection in series-parallel element start by
Step develops.When inside high-voltage parallel capacitor, single element occurs exception, fault, the change of its external electrical tolerance is the most not
Greatly, the voltage that simply its internal other healthy element bears can increase.Along with the growth of the time of operation, other health
Connection in series-parallel element may occur exception and fault successively due to the impact of bad service condition, finally causes high-voltage parallel capacitor
Fault.
The detection method of the most conventional high-voltage parallel capacitor mainly has infrared diagnostics and capacitance test.Infrared measurement of temperature
Diagnosis cannot the internal flaw of effective discovering device.Capacitance detection belongs to the test that periodically has a power failure.Its test environment and equipment
Actual motion condition is variant, it is impossible to accurately reflect potential internal flaw.The test interval cycle is longer simultaneously, it is impossible to slap in real time
Hold high-voltage parallel capacitor health status.
Along with the development of technology, the method occurring in that high-voltage parallel capacitor on-line monitoring.High by Real-time measuring and analyzing
Pressure shnt capacitor capacitance, in order to grasp high-voltage parallel capacitor health status, and send out at shnt capacitor inner member
Raw abnormal, fault, but when shnt capacitor entirety does not breaks down, send alarm in time, prevent from being finally evolved into shnt capacitor
Fault, it is to avoid high-voltage parallel capacitor equipment itself damages, reduces and impacts power system and miscellaneous equipment.Its realization side
Method is usually installs core through type current transformer, in order to measure the electric current flowing through capacitor on capacitor connecting sleeve.At height
Voltage transformer or discharge coil are installed, in order to measure the voltage of capacitor two interpolar between the terminal of pressure shnt capacitor the two poles of the earth.Electricity
Pressure and electric current pass to calculation control unit by the way of wired or wireless.Calculation control unit utilize measure gained voltage and
Electric current calculates capacitance, and is estimated high-voltage parallel capacitor health status according to electric capacitance change situation.This side
Method primary disadvantage is that and adds other adnexaes at shunt reactor body.Adnexa operates in the adverse circumstances of high field intensity, high temperature
In easily break down, the maintenance that the equipment that increases is overall, and Electric Field Distribution can be caused change, to high-voltage parallel capacitor
The properly functioning of body brings adverse effect.Still an alternative is that and utilize the high-voltage parallel measured in power scheduling SCACD system
Condenser current, voltage data, calculate high-voltage parallel capacitor capacitance, thus judge its health status.The master of this method
Wanting shortcoming is that the data in power scheduling SCACD system are not real time datas, there is also and asks electric current, voltage sample not same period etc.
Topic.
High-voltage parallel capacitor protective relaying device, is when high-voltage parallel capacitor there occurs that fault jeopardizes power system peace
During row for the national games, it is possible to send warning signal in time to operator, or directly send tripping operation to the chopper controlled
Order a kind of automatization measure to terminate the development of these events and equipment.Existing high-voltage parallel capacitor relay protection fills
Put, be all to utilize the current transformer installed to measure the electric current flowing through high-voltage parallel capacitor in real time, utilize and be arranged on bus
Voltage transformer or being connected in parallel on the discharge coil of high-voltage parallel capacitor two interpolar measures high-voltage parallel capacitor two in real time
The voltage of interpolar.The feature that when utilizing high-voltage parallel capacitor fault, electric current, voltage can change, surpasses by comparing electric current
Cross setting valve or differential pressure, method that unbalance voltage exceedes setting valve, it is judged that high-voltage parallel capacitor breaks down, thus to
The chopper controlled sends trip signal excision fault.The high-voltage parallel capacitor protective relaying device used the most both at home and abroad
The most do not possesses the function of on-line monitoring.
Summary of the invention
It is an object of the invention to not increase any external attached device, in high-voltage parallel capacitor protective relaying device,
Increase high-voltage parallel capacitor on-line monitoring related circuit plate and software function, utilize the original current/voltage of protective relaying device
Input circuit, measures electric current and voltage data in real time, carries out capacitance and calculate in real time, and the state completing high-voltage parallel capacitor is commented
Estimate, complete relevant information by the communication function of protective relaying device itself and regulate and control system to monitoring system of electric substation and dispatching terminal
The transmission of system.Thus realize simple, efficient, perfect high-voltage parallel capacitor on-line monitoring function, find high-voltage parallel in time
Capacitor faults trend, solves to there are the problems referred to above in background technology.
The present invention seeks to be realized by techniques below scheme:
A kind of method utilizing protective relaying device to realize high-voltage parallel capacitor on-line monitoring, comprises the steps of: 1. utilize
The original function of protective relaying device, measures electric current and the voltage of high-voltage parallel capacitor in real time；2. protective relaying device performs
Original relay protection function；3. utilize and measure the electric current and voltage arrived, calculate the capacitance of high-voltage parallel capacitor；4. according to meter
The capacitance value obtained, by comparing with default setting valve, it is determined that the health status of high-voltage parallel capacitor；5. will be relevant
Judge conclusion, shown by the human-computer interaction module of protective relaying device, and by the communication function of protective relaying device, upload
To monitoring system and regulator control system.
The described original function utilizing protective relaying device, refers to that the realization of on-line monitoring functional module is based on original
Protective relaying device hardware and software platform, do not increase hardware device, do not increase external circuit, do not increase auxiliary device；Survey in real time
The electric current of amount high-voltage parallel capacitor and voltage, refer to voltage current transducer, the A/D utilizing protective relaying device itself to have
Conversion element, sampling element, CPU element, it is achieved high-voltage parallel capacitor electric current and the Real-time Collection of voltage and calculating.
Described according to calculated capacitance value, by comparing with default setting valve, it is determined that high-voltage parallel electric capacity
The health status of device, refers to set the capacitance setting valve of high-voltage parallel capacitor and deviation allowable value in advance, and capacitance is preset
Setting valve uses electric capacitance measurement value when having a power failure test, deviation allowable value to match also with the certainty of measurement of protective relaying device
Retain suitable nargin；Deviation between capacitance value and the capacitance setting valve calculating gained is less than deviation allowable value
Time, it is determined that high-voltage parallel capacitor health status is normal；Between capacitance value and the capacitance setting valve calculating gained
When deviation exceedes deviation allowable value, it is determined that high-voltage parallel capacitor health status occurs abnormal.
The positive effect of the present invention is: one proposed by the invention utilizes protective relaying device to realize high-voltage parallel electric capacity
The method of device on-line monitoring, does not increase any external attached device, high-voltage parallel capacitor on-line monitoring function and relay protection
Device shares hardware and software platform, it is possible to realize calculating in real time the capacitance of high-voltage parallel capacitor, Real-Time Evaluation high-voltage parallel electricity
The health status of container, whether on cost, the most all has obvious advantage than prior art, can be effectively
Promote the technical merit of high-voltage parallel capacitor on-line monitoring.
Accompanying drawing explanation
Fig. 1 is that the embodiment of the present invention utilizes protective relaying device to realize the function signal of high-voltage parallel capacitor on-line monitoring
Figure；
In figure: protective relaying device 1, electric current, voltage acquisition computing module 2, relay protection function module 3, on-line monitoring function
Module 4, human-computer interaction module 5, communication module 6, voltage transformer 7, discharge coil 8, current transformer 9, monitoring system and tune
Ore-controlling Role 10；
Fig. 2 is a kind of high-voltage parallel capacitor mode of connection schematic diagram, and voltage takes from discharge coil；
In figure: discharge coil 8, current transformer 9, high-voltage parallel capacitor 11, current-limiting reactor 12；
Fig. 3 is a kind of high-voltage parallel capacitor mode of connection schematic diagram, and voltage takes from voltage transformer；
In figure: voltage transformer 7, current transformer 9, high-voltage parallel capacitor 11, current-limiting reactor 12.
Detailed description of the invention
Below in conjunction with accompanying drawing, by embodiment, the invention will be further described.
The first step, voltage transformer 7 or discharge coil 8 gather and output voltage analog quantity U is to protective relaying device 1.Electricity
Current transformer 9 gathers and exports current-mode analog quantity I to protective relaying device 1.
Second step, protective relaying device 1 utilizes electric current, voltage acquisition computing module 2, is calculated high-voltage parallel capacitor
Electric current, voltage measuring value.
3rd step protective relaying device 1, performs original relay protection function by relay protection function module 3.
4th step, protective relaying device 1, by on-line monitoring functional module 4, utilize the high-voltage parallel electricity that second step obtains
Condenser current, voltage measuring value calculate the capacitance of shnt capacitor.
For the mode of connection shown in accompanying drawing 2, its voltage takes from discharge coil 8.The formula that capacitance calculates is shown in formula (1),
In formula, f is frequency, and I is electric current, and U is voltage.
For the mode of connection shown in accompanying drawing 3, its voltage takes from voltage transformer 7.Capacitance computing formula is shown in formula (2),
In formula, f is frequency, and I is electric current, and U is voltage, and L is current-limiting reactor inductance.
5th step, on-line monitoring functional module 4 according to calculated capacitance value, by with default setting valve ratio
Relatively, it is determined that the health status of high-voltage parallel capacitor.In on-line monitoring functional module 4, preset in advance high-voltage parallel capacitor
Capacitance setting valve and tolerance value.Capacitance is preset setting valve and is typically used electric capacitance measurement value when having a power failure test, partially
Difference permissible value need to consider the certainty of measurement factor of protective relaying device and retain adequate allowance.When the capacitance calculating gained
When deviation between numerical value and capacitance setting valve is less than deviation allowable value, it is determined that high-voltage parallel capacitor health status is normal.
When deviation between capacitance value and the capacitance setting valve calculating gained is more than deviation allowable value, it is determined that high-voltage parallel electricity
Container health status is abnormal.
6th step, the high-voltage parallel capacitor health status that on-line monitoring functional module 4 draws, pass through protective relaying device
Human-computer interaction module 5 show, and deliver to monitoring system and regulator control system by the communication module 6 of protective relaying device
10.Being then return to the first step, in the case of not having external interrupt, the first step is carried out to the 6th step circulation.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope that the invention discloses, the change that can readily occur in or replacement,
All should contain within protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is as the criterion.
Claims (5)
1. one kind utilizes the method that protective relaying device realizes high-voltage parallel capacitor on-line monitoring, it is characterised in that comprise as follows
Step: 1. utilize the original function of protective relaying device (1), measures electric current and the voltage of high-voltage parallel capacitor (11) in real time；
2. protective relaying device performs original relay protection function；3. utilize and measure the electric current and voltage arrived, calculate high-voltage parallel electric capacity
The capacitance of device；4. according to calculated capacitance value, by comparing with default setting valve, it is determined that high-voltage parallel capacitor
Health status；5. by correlated judgment conclusion, shown by the human-computer interaction module of protective relaying device, and pass through relay protection
The communication function of device, is uploaded to monitoring system and regulator control system (10).
2. according to a kind of side utilizing protective relaying device to realize high-voltage parallel capacitor on-line monitoring described in claim (1)
Method, it is characterised in that: the described original function utilizing protective relaying device, refer to the realization of on-line monitoring functional module (4)
It is based on original protective relaying device hardware and software platform, does not increase hardware device, do not increase external circuit, do not increase attached setting
Standby；Measure electric current and the voltage of high-voltage parallel capacitor in real time, refer to the voltage x current utilizing protective relaying device itself to have
Changer, A/D conversion element, sampling element, CPU element, it is achieved high-voltage parallel capacitor electric current and the Real-time Collection of voltage
And calculating.
The most according to claim 1 and 2 a kind of protective relaying device is utilized to realize high-voltage parallel capacitor on-line monitoring
Method, it is characterised in that: described according to calculated capacitance value, by comparing with default setting valve, it is determined that high pressure
The health status of shnt capacitor, refers to set the capacitance setting valve of high-voltage parallel capacitor and deviation allowable value in advance, electricity
Capacity is preset setting valve and is used the certainty of measurement of electric capacitance measurement value when having a power failure test, deviation allowable value and protective relaying device
Match and retain suitable nargin；Deviation between capacitance value and the capacitance setting valve calculating gained is less than deviation
During permissible value, it is determined that high-voltage parallel capacitor health status is normal；When the capacitance value and the capacitance setting valve that calculate gained
Between deviation when exceeding deviation allowable value, it is determined that high-voltage parallel capacitor health status occurs abnormal.
The most according to claim 1 and 2 a kind of protective relaying device is utilized to realize high-voltage parallel capacitor on-line monitoring
Method, it is characterised in that: described utilization measures the electric current arrived and the capacitance of voltage calculating high-voltage parallel capacitor, is i.e. adapted to
Voltage takes from the situation of discharge coil (8), and being also adapted to discharge coil does not provide voltage to need to obtain from voltage transformer (7)
The situation of voltage, is i.e. adapted to the situation without current-limiting reactor (12), is also adapted to the situation of current-limiting reactor.
The most according to claim 1 and 2 a kind of protective relaying device is utilized to realize high-voltage parallel capacitor on-line monitoring
Method, it is characterised in that: described by correlated judgment conclusion, shown by the human-computer interaction module (5) of protective relaying device, and lead to
The communication function crossing protective relaying device is uploaded to monitoring system and regulator control system (10), refers to showing on the spot of on-line monitoring result
Show and be uploaded to the functional realiey of monitoring system and regulator control system, be complete based on the original communication function of protective relaying device
Become, both need not increase equipment, it is not required that increase communication port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610777347.6A CN106168638B (en) | 2016-08-31 | 2016-08-31 | Method for realizing online monitoring of high-voltage parallel capacitor by using relay protection device |
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|---|---|---|---|
| CN201610777347.6A CN106168638B (en) | 2016-08-31 | 2016-08-31 | Method for realizing online monitoring of high-voltage parallel capacitor by using relay protection device |
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| CN106168638B CN106168638B (en) | 2022-11-22 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107464692A (en) * | 2017-08-03 | 2017-12-12 | 无锡市电力滤波有限公司 | A kind of protective relaying device and its method of dry-type high-voltage self-healing type parallel condenser |
| 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 |
| CN109884436A (en) * | 2019-03-19 | 2019-06-14 | 国网山东省电力公司淄博供电公司 | Power capacitor complexes on-line monitoring method |
| 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 |
| CN111033280A (en) * | 2017-08-30 | 2020-04-17 | 三菱电机株式会社 | Capacitor capacity measuring device and power equipment |
| CN111579876A (en) * | 2019-02-18 | 2020-08-25 | 英捷力电机股份有限公司 | Capacitance value monitoring method for capacitor of power system |
| CN115343565A (en) * | 2022-10-19 | 2022-11-15 | 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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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107464692A (en) * | 2017-08-03 | 2017-12-12 | 无锡市电力滤波有限公司 | A kind of protective relaying device and its method of dry-type high-voltage self-healing type parallel condenser |
| 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 |
| CN111033280A (en) * | 2017-08-30 | 2020-04-17 | 三菱电机株式会社 | Capacitor capacity measuring device and power equipment |
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| 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 |
| CN111579876A (en) * | 2019-02-18 | 2020-08-25 | 英捷力电机股份有限公司 | Capacitance value monitoring method for capacitor of power system |
| CN109884436A (en) * | 2019-03-19 | 2019-06-14 | 国网山东省电力公司淄博供电公司 | Power capacitor complexes on-line monitoring method |
| 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 |
| CN115343565A (en) * | 2022-10-19 | 2022-11-15 | 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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