CN109298275B - Monitoring system and device for monitoring lightning arrester and monitoring power quality - Google Patents
Monitoring system and device for monitoring lightning arrester and monitoring power quality Download PDFInfo
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- CN109298275B CN109298275B CN201811222796.XA CN201811222796A CN109298275B CN 109298275 B CN109298275 B CN 109298275B CN 201811222796 A CN201811222796 A CN 201811222796A CN 109298275 B CN109298275 B CN 109298275B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 89
- 238000012806 monitoring device Methods 0.000 claims description 46
- 239000013307 optical fiber Substances 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 9
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 238000012952 Resampling Methods 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000005070 sampling Methods 0.000 description 15
- 230000006872 improvement Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- 208000033999 Device damage Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to a monitoring system and a device for monitoring an arrester and monitoring electric energy quality. According to the system, the calculation of the electric energy quality and the calculation of the monitoring parameters of the lightning arrester can be completed only by arranging one set of system voltage acquisition device, namely the voltage transformer, so that the information sharing degree is increased, and the system cost and the maintenance cost are reduced.
Description
Technical Field
The invention belongs to the technical field of intelligent substations, and particularly relates to a monitoring system and a monitoring device which are compatible with lightning arrester monitoring and electric energy quality monitoring.
Background
Along with the popularization and application of the intelligent transformer substation, a large number of lightning arrester online monitoring devices are installed in the transformer substation so as to perform online monitoring on the leakage current, the resistive current and the action times of the lightning arrester. Meanwhile, with the increasing requirements of power grids and power consumers on the quality of electric energy, the intelligent substation pays attention to the online monitoring of the quality of the electric energy.
At present, the on-line monitoring of the power quality and the on-line monitoring of the lightning arrester are two independent devices. The electric energy quality on-line monitoring device carries out analysis and calculation by acquiring the current and voltage of the system so as to complete the real-time monitoring of the electric energy quality. The lightning arrester on-line monitoring device carries out analysis and calculation by acquiring system voltage and lightning arrester leakage current to realize real-time monitoring of the working condition of the lightning arrester. The two types of online monitoring devices are independently implemented, and a mode that analog quantity is directly connected into the monitoring devices is adopted. According to the scheme, a large number of cables need to be laid independently in the intelligent substation for analog long-distance transmission, so that the device is easily subjected to field electromagnetic interference, data distortion and device damage are caused; and the voltage information of the system is sampled for many times, the repeated sampling is caused by low information sharing degree, and the independent system increases excessive management and maintenance cost.
Disclosure of Invention
The invention aims to provide a monitoring system and a monitoring device which are compatible with lightning arrester monitoring and electric energy quality monitoring, and aims to solve the problems that the information sharing degree is low, and the management and maintenance cost is excessively increased when an online lightning arrester monitoring device and an intelligent electric energy online monitoring device are independently arranged.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the invention discloses a monitoring system for monitoring a lightning arrester and monitoring power quality, which comprises at least one power quality combiner, wherein each power quality combiner corresponds to a line interval, and each power quality combiner acquires system current through a corresponding current transformer and system voltage through a corresponding voltage transformer; the electric energy quality combiner outputs SV messages to a digital interface of the monitoring device; the leakage current monitoring device is characterized by also comprising a leakage current acquisition module, wherein the leakage current acquisition module is provided with an optical fiber output end, and the optical fiber output end is connected to an optical fiber interface of the monitoring device through an optical fiber; the monitoring device includes a processor and a memory, the processor for executing instructions stored in the memory to implement the method of:
the method comprises the steps of receiving an SV message sent by a power quality combiner and an optical fiber data message sent by a leakage current acquisition module; analyzing the SV message to obtain system voltage and system current; analyzing the optical fiber data message to obtain the leakage current of the lightning arrester; calculating to obtain power quality monitoring parameters according to the system voltage and the system current; and synchronizing the system voltage and the leakage current of the lightning arrester, and calculating to obtain the monitoring parameters of the lightning arrester according to the synchronized system voltage and the leakage current of the lightning arrester.
The monitoring device for monitoring the lightning arrester and monitoring the power quality comprises a digital interface for receiving SV messages and an optical fiber interface for receiving optical fiber data messages; further comprising a processor and a memory, the processor for executing instructions stored in the memory to implement the method of:
the method comprises the steps of receiving an SV message sent by a power quality combiner and an optical fiber data message sent by a leakage current acquisition module; analyzing the SV message to obtain system voltage and system current; analyzing the optical fiber data message to obtain the leakage current of the lightning arrester; calculating to obtain power quality monitoring parameters according to the system voltage and the system current; and synchronizing the system voltage and the leakage current of the lightning arrester, and calculating to obtain the monitoring parameters of the lightning arrester according to the synchronized system voltage and the leakage current of the lightning arrester.
The invention has the beneficial effects that:
according to the monitoring system and the monitoring device which have both lightning arrester monitoring and power quality monitoring, leakage current of the lightning arrester is collected through the leakage current collecting module, system voltage is collected through the voltage transformer, system current is collected through the current transformer, and the collected information is uniformly transmitted to the monitoring device to calculate power quality and lightning arrester monitoring parameters. The system can complete the calculation of the electric energy quality and the calculation of the monitoring parameters of the lightning arrester by only arranging one set of system voltage acquisition device (namely, a voltage transformer), thereby increasing the information sharing degree and reducing the system cost and the maintenance cost.
As a further improvement of the system and the device, the fiber optic data message is an FT3 message. And the FT3 message is adopted to transmit the leakage current of the lightning arrester to the monitoring device, and the data transmission is reliable.
As a further improvement of the system and the device, when the system voltage and the arrester leakage current are synchronized, the system voltage is resampled by taking the arrester leakage current as a reference, so that the synchronization of the system voltage and the arrester leakage current is realized. Generally, the sampling frequency of the system voltage is higher than that of the lightning arrester leakage current, so that the system voltage is resampled by taking the lightning arrester leakage current as a reference, and the obtained synchronized system voltage and the lightning arrester leakage current are more accurate.
As a further improvement of the system, when two or more electric energy quality mergers exist, the output ends of the electric energy quality mergers are connected with the switch, and the switch is connected with the monitoring device. The data sent by each power quality combiner is forwarded through the switch, so that the number of interfaces of the monitoring device is saved.
As a further improvement of the system, the monitoring device comprises a power supply plug-in, a graphic interface plug-in, a CPU plug-in, a storage plug-in, an FT3 plug-in, an NPI plug-in and an export plug-in; the FT3 plug-in is used for receiving an FT3 message sent by a leakage current acquisition module, the NPI plug-in is used for receiving an SV message sent by a power quality combiner, and the processor and the memory are arranged on the CPU plug-in. The monitoring device of the invention is realized by means of the plug-in form of the existing device, which is more convenient.
As a further improvement of the system, the leakage current collection module is mounted on the arrester ground wire. And the leakage current acquisition module is arranged on the ground wire of the lightning arrester, so that the lightning arrester is safer.
As a further improvement of the device, the device also comprises a power supply plug-in, a graphic interface plug-in, a CPU plug-in, a storage plug-in, an FT3 plug-in, an NPI plug-in and an export plug-in; the FT3 plug-in is used for receiving an FT3 message sent by a leakage current acquisition module, the NPI plug-in is used for receiving an SV message sent by a power quality combiner, and the processor and the memory are arranged on the CPU plug-in. The monitoring device of the invention is realized by means of the plug-in form of the existing device, which is more convenient.
Drawings
FIG. 1 is a schematic view of a monitoring system of the present invention that combines lightning arrester monitoring and power quality monitoring;
FIG. 2 is a schematic illustration of the plug-in arrangement of the monitoring device of the present invention;
FIG. 3 is a data processing flow diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
Compromise monitoring system embodiment of arrester monitoring and power quality monitoring:
as shown in fig. 1, the monitoring system for monitoring both the lightning arrester and the power quality includes a leakage current collecting module, a power quality combiner, a switch, and a monitoring device.
The leakage current collection module is used for collecting leakage current of the lightning arrester, is mounted on a grounding wire of the lightning arrester in a penetrating mode, and is provided with an optical fiber output end which is connected to an optical fiber interface of the monitoring device through an optical fiber. The leakage current acquisition module can perform analog-to-digital conversion on the acquired leakage current of the lightning arrester, frames the corresponding digital quantity signal according to an FT3 message format and transmits the digital quantity signal to the monitoring device in an optical fiber communication mode. Wherein, the sampling frequency of the leakage current collecting module can be set to be 1.2 KHz.
A voltage transformer and a current transformer are arranged in each interval and used for collecting system voltage and system current, meanwhile, an electric energy quality combiner is correspondingly arranged in each interval, the electric energy quality combiner is connected with a system voltage signal from a measuring coil of the voltage transformer, and is connected with a system current signal from a measuring coil of the current transformer. The electric energy quality merger carries out networking according to the voltage grade, and the current and voltage information is transmitted to the switch in an SV message mode and is transmitted to the monitoring device by the switch in a network mode, so that the number of interfaces of the monitoring device is reduced.
The monitoring device is used for calculating to obtain power quality monitoring parameters according to the system voltage acquired by the voltage transformer and the system current acquired by the current transformer; and the system is also used for synchronizing the leakage current of the lightning arrester acquired by the leakage current acquisition module and the system voltage acquired by the system voltage acquisition module, and calculating to obtain the monitoring parameters of the lightning arrester according to the synchronized leakage current of the lightning arrester and the system voltage. Wherein, the sampling frequency of the power quality combiner is increased from the conventional 4KHz to 12.8 KHz.
The power quality monitoring parameters comprise a voltage effective value, a current effective value, active power, reactive power, apparent power, a power factor, voltage deviation, frequency deviation, three-phase voltage, current unbalance and the like; the lightning arrester monitoring parameters comprise full current, resistive current, action times and the like.
The monitoring device is designed in a plug-in mode, and the schematic diagram of the plug-in arrangement is shown in figure 2. The number 1 is a power supply plug-in, the number 3 is a graphic interface plug-in, the number 6 is a CPU plug-in, the number 7 is a storage plug-in, the number 9 is an FT3 plug-in, the number A is an NPI plug-in, and the number C is an export plug-in. The plug-in unit 9 receives an FT3 message sent by the leakage current acquisition module, the plug-in unit A receives an SV message sent by the power quality combiner, a system voltage signal and a system current signal are obtained from a network, and the plug-in unit 6 is used for analyzing and calculating power quality monitoring parameters and lightning arrester monitoring parameters.
Based on the above system, the whole workflow is explained in detail.
1. The lightning arrester leakage current monitoring method comprises the steps of opening a ground wire of the lightning arrester, connecting a leakage current acquisition module, setting sampling frequency to be 1.2KHz, completing acquisition of leakage current of the lightning arrester by amplifying and performing analog-to-digital conversion on signals, framing the acquired current signals in an FT3 extended frame format, and transmitting the current signals to a monitoring device in an optical fiber communication mode.
2. The sampling frequency of the electric energy quality combiner is increased from conventional 4KHz to 12.8KHz, and a system voltage signal is obtained from a measuring coil of the voltage transformer, and a system current signal is obtained from a measuring coil of the current transformer.
3. And the electric energy quality merger in the transformer substation carries out networking according to the voltage grade, and the current and voltage information is transmitted to the monitoring device in an SV mode.
4. The monitoring device is designed according to the plug-in arrangement described above. The data processing flow is shown in fig. 3. The monitoring device receives SV messages sent by the power quality combiner and FT3 messages sent by the leakage current acquisition module through different communication interfaces at the same time, analyzes the messages, analyzes system voltage and system current from the SV messages, and analyzes leakage current of the lightning arrester from the FT3 messages. And calculating power quality monitoring parameters according to the system voltage and the system current, and meanwhile, resampling the system voltage by taking the leakage current of the lightning arrester as a reference so as to calculate the lightning arrester monitoring parameters and output and store the calculation result. The voltage resampling can be carried out according to the following steps:
1) the calculation of the resistive current of the lightning arrester requires the sampling synchronization of the system voltage and the leakage current of the lightning arrester, and the monitoring system in the embodiment acquires the sampling synchronization time error delta t in the acquisition and transmission processes of the system voltage and the leakage current of the lightning arrester. It should be noted that the sampling synchronization time error Δ t can be obtained through multiple experiments, and the value is stored in the monitoring device for subsequent processing and calculation.
2) Sampling period T of leakage current of lightning arresteriSampling period T of specific system voltageuTherefore, the system voltage is resampled with the lightning arrester leakage current as a reference.
If a periodic lightning arrester leakage current sampling sequence { ij+1,ij+2,…,ij+24Calculating a sample sequence as a resistive current, and taking into account that the sampling synchronization time error Δ t may be greater than 0 or less than 0, the system voltage sampling sequence needs to take a cycle series acquired at the same time and extend half cycle forwards and backwards, i.e., { u }j-127,…,uj+1,…,uj+256,…,uj+256+128Are } with ij+1The position of the corresponding system voltage point is n ═ delta T/TuDue to the fact thatn may not be an integer and the corresponding u is located at uj+1+n,uj+1+n+1In between, the position of the system voltage point corresponding to all the lightning arrester leakage current sampling points can be written as m ═ T (k ═ T)i+Δt)/Tu(k 1, …,24), divide by ij+1Except the corresponding system voltage point, the leakage current points of other arresters can be taken as { u }j+1+m,uj+1+m+1,uj+1+m+2And 4, calculating the difference value of the parabolic lines.
In addition, it should be noted that the configuration number of the power quality combiners is configured according to the specific requirements of the specific engineering, and not every power quality combiner is connected to the system voltage and the system current at the same time, but the form of the power quality combiner is also connected to multiple paths of system currents. In the system scheme of each project, a voltage monitoring channel is configured according to a main wiring diagram, so that the requirement of system voltage monitoring is met, and repeated monitoring is avoided.
Compromise monitoring of arrester and power quality monitoring's monitoring devices embodiment:
the monitoring system in the monitoring system considering both the arrester monitoring and the power quality monitoring is seen as the functions and the structure of the monitoring device considering both the arrester monitoring and the power quality monitoring in the embodiment, and the details are not repeated here.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (8)
1. A monitoring system giving consideration to arrester monitoring and power quality monitoring is characterized by comprising at least one power quality combiner, wherein each power quality combiner corresponds to a line interval, and each power quality combiner acquires system current through a corresponding current transformer and system voltage through a corresponding voltage transformer; the electric energy quality combiner outputs SV messages to a digital interface of the monitoring device;
the leakage current monitoring device is characterized by also comprising a leakage current acquisition module, wherein the leakage current acquisition module is provided with an optical fiber output end, and the optical fiber output end is connected to an optical fiber interface of the monitoring device through an optical fiber;
the monitoring device includes a processor and a memory, the processor for executing instructions stored in the memory to implement the method of:
the method comprises the steps of receiving an SV message sent by a power quality combiner and an optical fiber data message sent by a leakage current acquisition module;
analyzing the SV message to obtain system voltage and system current; analyzing the optical fiber data message to obtain the leakage current of the lightning arrester;
calculating to obtain power quality monitoring parameters according to the system voltage and the system current;
and resampling the system voltage by taking the leakage current of the lightning arrester as a reference, synchronizing the system voltage and the leakage current of the lightning arrester, and calculating to obtain monitoring parameters of the lightning arrester according to the synchronized system voltage and the leakage current of the lightning arrester.
2. The monitoring system for both monitoring lightning arrester and monitoring power quality according to claim 1, wherein the optical fiber data message is an FT3 message.
3. The monitoring system for both monitoring of lightning arrester and monitoring of power quality as claimed in claim 1, wherein when there are two or more power quality combiners, the output terminals of the power quality combiners are connected to the switch, and the switch is connected to the monitoring device.
4. The monitoring system for both lightning arrester monitoring and power quality monitoring according to claim 2, wherein the monitoring device comprises a power supply plug-in, a graphic interface plug-in, a CPU plug-in, a storage plug-in, an FT3 plug-in, an NPI plug-in, and a pull-out plug-in; the FT3 plug-in is used for receiving an FT3 message sent by a leakage current acquisition module, the NPI plug-in is used for receiving an SV message sent by a power quality combiner, and the processor and the memory are arranged on the CPU plug-in.
5. The monitoring system for both monitoring of lightning arrester and monitoring of quality of electric energy as set forth in claim 1, wherein the leakage current collection module is mounted on a lightning arrester ground wire.
6. A monitoring device for monitoring lightning arrester and electric energy quality is characterized by comprising a digital interface for receiving SV messages and an optical fiber interface for receiving optical fiber data messages; further comprising a processor and a memory, the processor for executing instructions stored in the memory to implement the method of:
the method comprises the steps of receiving an SV message sent by a power quality combiner and an optical fiber data message sent by a leakage current acquisition module;
analyzing the SV message to obtain system voltage and system current; analyzing the optical fiber data message to obtain the leakage current of the lightning arrester;
calculating to obtain power quality monitoring parameters according to the system voltage and the system current;
and resampling the system voltage by taking the leakage current of the lightning arrester as a reference, synchronizing the system voltage and the leakage current of the lightning arrester, and calculating to obtain monitoring parameters of the lightning arrester according to the synchronized system voltage and the leakage current of the lightning arrester.
7. The monitoring device for both lightning arrester monitoring and power quality monitoring according to claim 6, wherein the optical fiber data message is an FT3 message.
8. The monitoring device for both lightning arrester monitoring and power quality monitoring according to claim 7, wherein the device further comprises a power supply plug-in, a graphic interface plug-in, a CPU plug-in, a storage plug-in, an FT3 plug-in, an NPI plug-in, and a pull-out plug-in; the FT3 plug-in is used for receiving an FT3 message sent by a leakage current acquisition module, the NPI plug-in is used for receiving an SV message sent by a power quality combiner, and the processor and the memory are arranged on the CPU plug-in.
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