CN102426328B - Capacitive equipment insulation state real-time on-line monitoring method - Google Patents

Abstract

The invention discloses a capacitive equipment insulation state real-time on-line monitoring method. On the basis that various types of capacitive equipment are monitored online, data acquired by an on-site on-line monitoring terminal is accurately analyzed and treated through upper-computer expert software, each parameter reflecting the equipment state is displayed visually on an expert software picture in the modes of diagrams, data and curves, alarms are sent out to operators on duty in three modes in time when an equipment failure is detected, and the instantaneity, the accuracy, the stability, the reliability and the timeliness of on-line monitoring are improved. The problems of large labor intensity, long test cycle, poor defect detection timeliness, influence on power supply reliability and the like are avoided, and power failure, power supply abnormalities and other phenomena caused by capacitive equipment insulation in a transformer substation are reduced.

Description

A kind of capacitive equipment state of insulation realtime on-line monitoring method

Technical field

The invention belongs to capacitive equipment on-line monitoring technique field, be specifically related to a kind of capacitive equipment state of insulation realtime on-line monitoring method.

Background technology

Capacitive equipment mainly comprises current transformer (TA), coupling condenser (OY), capacitance type potential transformer (CVT), lightning arresters etc. are all important power transmission and transforming equipments, in transformer station, ratio is very large, in transformer station, occupy very important status, can whether its state of insulation is well directly connected to whole transformer station normally be moved, and even goes back the safety of entail dangers to miscellaneous equipment and the person.The repair based on condition of component that adopted in recent years progressively makes up the deficiency of preventative maintenance, jointly improves power system device inspection and maintenance.Repair based on condition of component can be saved a large amount of manpower and materials, extension device serviceable life, increases power transmission and transformation reliability.But the early stage actual safe operation monitoring system operational effect putting into operation is unsatisfactory, do not obtain economic benefit and the social benefit of expection.According to document, add up, in 157 on-line monitoring systems of whole nation investigation, that can normally move only accounts for 15%, can not normally use or in paralyzed state account for 51%, can not accurately reflect the real-time state of insulation of field apparatus, especially can not to on-the-spot on-line monitoring terminal institute image data, carry out the real-time state of insulation that accurate analysis carrys out judgment device by expert software, more state intuitively can not be presented in expert software interface, and to operator on duty, send warning in time when fault being detected.

Summary of the invention

The object of this invention is to provide a kind of capacitive equipment state of insulation realtime on-line monitoring method, can carry out on-line monitoring to capacitance type equipment insulation state, the labour intensity of having avoided repair based on condition of component in the past to bring is large, test period length, defect detection poor in timeliness, affect the problem of power supply reliability, has reduced the phenomenon of the power failure causing because of capacitance type equipment insulation in transformer station, abnormal electrical power supply.

The technical solution adopted in the present invention is, a kind of capacitive equipment state of insulation realtime on-line monitoring method is specifically implemented according to following steps:

Step 1: data acquisition;

Step 2: Data Analysis;

Step 3: report to the police.

Feature of the present invention is also,

Step 1 data acquisition wherein, specifically according to following steps, implement: self-checking circuit detects whole hardware state, detection signal is the sinusoidal signal by the 50Hz of power frequency component generation module generation, in detection, finish and confirm after hardware normal operation, signal selection module is closed testing circuit, select secondary end shield leakage current collection path, leakage current collection module is sent to programmable amplifier by image data and amplifies, at GPS, synchronously trigger under the excitation of pulse per second (PPS), all acquisition terminals carry out A/D conversion to signal simultaneously, digital signal after conversion is sent in the high-speed RAM of kernel processor chip FPGA inside, by NIOSII microprocessor by device numbering, device type, sampling interval, sampling time, on-the-spot humiture, mains frequency, amplifier multiple, and the secondary end shield leakage current data information after digitized processing being stored in high-speed RAM is packed, then by GPRS wireless module, be uploaded to host computer.

Step 2 Data Analysis wherein, specifically according to following steps, implement:

Step a: the Voltage Peak peak value that calculates image data according to following formula:

$U_{\mathrm{real}}=\frac{U_{\mathrm{peak}+}-U_{\mathrm{peak}-}}{2^{16}\×K_{\mathrm{mag}}}\×10,$

U wherein _peak+, U _peak-for the positive negative peak of the sampled data after quick FFT, K _magfor signal amplification factor;

Step b: the size of calculating leakage current according to following formula:

$I=\frac{U_{\mathrm{real}}\×100}{\sqrt{2}},$

U wherein _realfor Voltage Peak peak value;

Step c: according to the following formula, calculate equivalent capacitance in conjunction with leakage current, mains frequency:

$C=\frac{I}{2\mathrm{\πf}\×U}\×{10}^6,$

Wherein U is busbar voltage, the frequency that f is leakage current;

Steps d: draw relative dielectric loss by method relatively according to the following formula:

T wherein _sfor the count cycle of counter, the cycle that T is line voltage, n is for calculating umber of pulse.

Step 3 is wherein reported to the police, and specifically according to following steps, implements: when the value of the relative dielectric loss monitoring is greater than total threshold value 0.5, by SMS, Modem sends SMS to operator on duty.

Step 3 is wherein reported to the police, and specifically according to following steps, implements: in expert software data sheet interface, the data that fault detected are highlighted in red mode.

Step 3 is wherein reported to the police, and specifically according to following steps, implements: use alarm lamp, and when receiving the bright and sounding of failure message Times warning lamp.

The invention has the beneficial effects as follows, all kinds capacitive apparatus is carried out on the basis of on-line monitoring, by host computer expert software, on-the-spot on-line monitoring terminal institute image data is carried out to accurate analysis and processing, the parameters of reflection equipment state is intuitively presented on expert software picture with chart, data, curve form, and to operator on duty, in three kinds of modes, send warning in time when equipment failure being detected, improved real-time, accuracy, stability and the reliability of on-line monitoring and ageing.

Accompanying drawing explanation

Fig. 1 is monitoring terminal data acquisition block diagram in the inventive method.

Embodiment

Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.

Capacitive equipment state of insulation realtime on-line monitoring method of the present invention, specifically according to following steps, implement:

Step 1: owing to reflecting that a major parameter of capacitance type equipment insulation performance is dielectric dissipation factor, and in this method, use relatively method to calculate dielectric dissipation factor, this calculating need to be sampled the secondary end shield electric current of several capacitive equipments, then by host computer, image data is carried out to computational analysis.

Data acquisition block diagram is as Fig. 1, in order to guarantee the stable of system, safety, the hardware realization of the method comprises self-checking circuit whole hardware state is detected, and detection signal is the sinusoidal signal by the 50Hz of power frequency component generation module generation, in detection, finish and confirm after hardware normal operation, signal selection module is closed testing circuit, select secondary end shield leakage current collection path, leakage current collection module is sent to programmable amplifier by image data and carries out suitable amplification, object is in order to guarantee the safety of A/D modular converter, at GPS, synchronously trigger under the excitation of pulse per second (PPS), all acquisition terminals carry out A/D conversion to signal simultaneously, digital signal after conversion is sent in the high-speed RAM of kernel processor chip FPGA inside, device numbering in the method being realized by NIOSII microprocessor, device type, sampling interval, sampling time, on-the-spot humiture, mains frequency, amplifier multiple, and the secondary end shield leakage current data information after digitized processing being stored in high-speed RAM is packed, then by GPRS wireless module, be uploaded to host computer.

Step 2: first host computer expert resolves according to design agreement the packet being sent by acquisition terminal equipment receiving, analytic parameter comprises device numbering, device type, sampling interval, sampling time, scene temperature, on-the-spot humidity, mains frequency, amplifier multiple and leakage current data.Parameters before mains frequency is mainly used as acquisition terminal sign, setting and environmental monitoring, and the parameters starting backward from mains frequency obtains reflecting several important parameters of equipment main performance through following calculation step, comprise leakage current, equivalent capacitance, relatively dielectric loss.

Calculation step:

Step a: the Voltage Peak peak value that calculates image data according to formula (1).

$U_{\mathrm{real}}=\frac{U_{\mathrm{peak}+}-U_{\mathrm{peak}-}}{2^{16}\×K_{\mathrm{mag}}}\×10\left(V\right)---\left(1\right)$

U wherein _peak+, U _peak-for the positive negative peak of the sampled data after quick FFT, K _magfor signal amplification factor.

Step b: the size of calculating leakage current according to (2).

$I=\frac{U_{\mathrm{real}}\×100}{\sqrt{2}}\left(\mathrm{mA}\right)---\left(2\right)$

U wherein _realthe Voltage Peak peak value calculating for formula (1).

Step c: according to formula (3), calculate equivalent capacitance in conjunction with leakage current, mains frequency.

$C=\frac{I}{2\mathrm{\πf}\×U}\×{10}^6\left(\mathrm{pF}\right)---\left(3\right)$

Wherein U is busbar voltage, the frequency that f is leakage current.

Steps d: draw relative dielectric loss by method relatively according to formula (4).

T wherein _sfor the count cycle of counter, the cycle that T is line voltage, n is for calculating umber of pulse.

By above operation, parameters has all become parameters that can actual reflection field apparatus, and is presented at accordingly and take Visual C++ as developing instrument, in the host computer expert software interface that the SQL Server 2000 of take is data access medium.

Step 3: be the fault that guarantees to reflect that in time Site Detection arrives, designed three kinds of warning implementations, be respectively short message of mobile telephone for alarm, expert software reports to the police at main interface, and onsite alarming lamp.

When the value of the relative dielectric loss monitoring is greater than total threshold value 0.5, the type of alarm of SMS is for to send SMS by SMS Modem to operator on duty; The data that in expert software type of alarm Shi expert software data sheet interface, this group detected to fault be take red mode and are highlighted (normal Show Color is black); Onsite alarming lamp mode is for being used alarm lamp, and when receiving, this failure message Times warning lamp is bright, and this alarm lamp has alarm vocal function in addition.

Because system is supported Real-time Collection, so maintainer can be at any time (before on-the-spot on-line monitoring terminal institute acquisition interval five minutes) carries out acquisition operations equipment is carried out to Real-time Collection in host computer expert software, the real-time state of insulation of understanding equipment, has increased the reliability of equipment on-line monitoring.

By the present invention at transformer station's installation and operation, through operation result, show: the present invention can be good at the state of insulation of the reflection capacitance type equipment of monitoring, and when breaking down, monitored equipment can to operator on duty, send warning in three kinds of modes, in addition, this invention can be assisted computational analysis to some major parameters of this capacitance type equipment (as leakage current, equivalent capacitance, mains frequency), makes the on-line monitoring method of this state of insulation have more meaning.

As shown in table 1, this service data is the data of 13 on May 2nd, 0 o'clock 1 May 2 in 2011, from these data, can find out, this relative dielectric loss is basicly stable in 0.03% left and right, and leakage current is stabilized in 15mA left and right, equivalent capacitance is stabilized in 430pF left and right, system frequency is stabilized in about 50Hz, small with desirable electrical network frequency phase-difference, and by these data, to compare difference little with patrolling and examining surveyed data, within tolerance interval, the validity of this invention to state of insulation on-line monitoring is described.

Table 1 online monitoring data

Claims (4)

1. a capacitive equipment state of insulation realtime on-line monitoring method, is characterized in that, specifically according to following steps, implements:

Step 1: data acquisition, specifically according to following steps, implement: self-checking circuit detects whole hardware state, detection signal is the sinusoidal signal by the 50Hz of power frequency component generation module generation, in detection, finish and confirm after hardware normal operation, signal selection module is closed testing circuit, select secondary end shield leakage current collection path, secondary end shield leakage current collection path is sent to programmable amplifier by image data and amplifies, at GPS, synchronously trigger under the excitation of pulse per second (PPS), acquisition terminal carries out A/D conversion to signal simultaneously, digital signal after conversion is sent in the high-speed RAM of kernel processor chip FPGA inside, by NIOS II microprocessor by device numbering, device type, sampling interval, sampling time, on-the-spot humiture, mains frequency, amplifier multiple, and the secondary end shield leakage current data information after digitized processing being stored in high-speed RAM is packed, then by GPRS wireless module, be uploaded to host computer,

Step 2: Data Analysis, specifically according to following steps, implement:

Step a: the Voltage Peak peak value that calculates image data according to following formula:

$U_{\mathrm{real}}=\frac{U_{\mathrm{peak}+}-U_{\mathrm{peak}-}}{2^{16}\×K_{\mathrm{mag}}}\×10,$

U wherein _peak+, U _peak-for the positive negative peak of the sampled data after quick FFT, K _magfor signal amplification factor;

Step b: the size of calculating leakage current according to following formula:

$I=\frac{U_{\mathrm{real}}\×100}{\sqrt{2}},$

U wherein _realfor Voltage Peak peak value;

Step c: according to the following formula, calculate equivalent capacitance in conjunction with leakage current, mains frequency:

$C=\frac{I}{2\mathrm{\πf}\×U}\×{10}^6,$

Wherein U is busbar voltage, the frequency that f is leakage current;

Steps d: draw relative dielectric loss by method relatively according to the following formula:

T wherein _sfor the count cycle of counter, the cycle that T is line voltage, n is for calculating umber of pulse;

Step 3: report to the police.

2. capacitive equipment state of insulation realtime on-line monitoring method according to claim 1, it is characterized in that, described step 3 is reported to the police, specifically according to following steps, implement: when the value of the relative dielectric loss monitoring is greater than total threshold value 0.5, by SMS, Modem sends SMS to operator on duty.

3. capacitive equipment state of insulation realtime on-line monitoring method according to claim 1, it is characterized in that, described step 3 is reported to the police, and specifically according to following steps, implements: in expert software data sheet interface, the data that fault detected are highlighted in red mode.

4. capacitive equipment state of insulation realtime on-line monitoring method according to claim 1, is characterized in that, described step 3 is reported to the police, and specifically according to following steps, implements: use alarm lamp, and when receiving the bright and sounding of failure message Times warning lamp.

Images