JP3876966B2 - Substation facility remote monitoring system and remote monitoring method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a remote monitoring system and a remote monitoring method for a substation facility.
[0002]
[Prior art]
Substations can be classified into continuous monitoring control substations, remote constant monitoring control substations, intermittent monitoring control substations, remote intermittent monitoring control substations, and simple monitoring power plants according to the operation method.
[0003]
Recently, substations constructed overseas have received various measurements over the Internet, evaluated them, and monitored various facilities. That is, predictive maintenance or remaining life evaluation is performed by external diagnosis via the Internet.
[0004]
Japanese Patent Application Laid-Open No. 8-154134 describes an equipment monitoring information automatic communication device.
[0005]
[Problems to be solved by the invention]
For substations in remote locations such as overseas, receiving all the measured information via the Internet and conducting monitoring work increases the communication cost as data increases. However, monitoring with a small amount of data is problematic in terms of monitoring accuracy.
[0006]
In view of this point, the present invention divides the data required for substation monitoring into two types, and divides it into data that is always required and data that is required to be input at any time, and performs on-call for 24 hours. It is an object of the present invention to provide a monitoring system and a monitoring method that can make trend management inexpensive, quick, and fast by unifying information.
[0007]
[Means for Solving the Problems]
In the present invention, data for performing partial discharge monitoring and circuit breaker characteristic monitoring is received at least as always required data and other data as required data as needed.
[0008]
Specifically, the present invention provides the following apparatuses and methods.
[0009]
The present invention provides a remote monitoring system for performing predictive maintenance or remaining life assessment by external diagnosis for various substation facilities at a remote location, and detects at least a current input and a switching command input to a circuit breaker. The detection value is immediately transmitted to the monitoring device of the monitoring center via the communication network (1) such as the Internet, the first detection value, the second detection value by the partial discharge measurement of the substation facilities, and others. A database is constructed by accumulating various information including measured values in the substation server, and the monitoring device inputs the first detected value and the first input through the communication network (2) such as a telephone line or a dedicated line as needed. Provided is a remote monitoring system for substation equipment that performs circuit breaker characteristic monitoring, partial discharge monitoring, trend diagnosis of various substation equipment and remaining life evaluation based on the detected value of 2.
[0010]
Partial discharge measurement of substation equipment includes partial discharge measurement of cables connected to circuit breakers. The former includes partial discharge measurement of the transformer.
[0011]
The present invention relates to a remote monitoring method for performing predictive maintenance or remaining life evaluation by external diagnosis for various substation facilities in a remote location, and shows a first current input and a switching input detected at least for a circuit breaker. Is immediately received via the communication network (1), and various information including the second detection value by the partial discharge measurement accumulated in the substation server and other measurement values are transmitted via the communication network (2). Received from time to time, using various information including the first detection value, the second detection value, and other measurement values, circuit breaker characteristics monitoring, partial discharge monitoring, substation equipment trend diagnosis and remaining life evaluation Provide a remote monitoring method for substation equipment.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0013]
FIG. 1 is a block diagram according to an embodiment of the present invention. In the figure, a substation 1 in a remote place such as overseas and a monitoring center 2 in a country are a communication network (1) 3 and a communication network (2) 4. It is tied with. The communication network (1) 3 and the communication network (2) 4 may be the same. One may be a communication network such as the Internet, and the other may be a communication network using a telephone line or a dedicated device.
[0014]
As is well known, the substation 1 includes a transformer unit, a bus unit, and a line unit. The transformer unit is configured by arranging various facilities such as a transformer, an oil / gas bushing, a current transformer, and a circuit breaker. The bus unit is composed of various equipment such as a three-phase main type main bus and disconnector, and the line unit is a current transformer, circuit breaker, disconnector, current transformer, instrument transformer, gas bushing, and lightning arrester. Various facilities such as are arranged.
[0015]
For the circuit breaker characteristic monitoring, it will be described later as current input 5, switching command input (first detection value) 6 and information accompanying it (included in various input / output information 7). a contact point, b contact the contact (contact, contact) information, blocking sound information is an important factor. These pieces of information are collected in the data collection 10 together with the data of the partial discharge measurement 8 and other measurement 9 data. These data are immediately transmitted to the monitoring device 11 of the monitoring center 2 via the communication network (1) 3. From the monitoring side, it will be received.
[0016]
As described above, the partial discharge measurement 8 is performed on the substation facilities, and the measurement value (second detection value) is collected from time to time in the data collection device 10 together with the measurement value of the other measurement 9. The data is stored in the substation server 12 and used as the database 13.
[0017]
Further, the current input 5, the opening / closing command input, the contact information as the information associated therewith, the shut-off sound information, and various input / output information are stored in the database 13.
[0018]
The monitoring device 11 is connected to a monitoring server 15, and the monitoring server 15 has a database 16.
[0019]
The monitoring device 11 performs various types of monitoring, that is, characteristic monitoring 17 using data transmitted from the data collection device 10 via the communication network (1) 3. Among these monitoring are partial discharge monitoring and circuit breaker characteristic monitoring. Various evaluations 18 are performed from the characteristic monitor 17, various trends 19 are calculated, and a screen display 20 is displayed.
[0020]
FIG. 2 shows a typical internal structure of a 550 kVGIS (gas insulated switchgear) (main busbar three-phase collective example). In this figure, three-phase collective main buses 21 and 22 are disposed on both sides, and vertical circuit breakers 25, 26, and 27 are disposed on both sides via disconnectors 23 and 24, respectively. Between the circuit breakers 26 and 27, disconnectors 28 and 29, instrument transformers 30 and 31, and power cables 32, 33 and 34 including a cable head are arranged.
[0021]
In such a structure, for example, a CT sensor 41 for detecting current input to the circuit breaker 26, a TC sensor 42 for detecting open command input, and a CC sensor 43 for detecting contact contact are provided in the circuit breaker 26. In addition, partial discharge sensors CH1 to CH3 and CH4 to CH6 for detecting partial discharge from the power cable are provided.
[0022]
Signals detected by the CT sensor 41, the TC sensor 42, the CC sensor 43, and the partial discharge sensors CH1 to 3 and CH4 to 6 are collected in the data collection devices 10a and 10b (the data collection device 10 in FIG. 1).
[0023]
FIG. 3 shows a circuit diagram of a circuit breaker in which a resistor circuit is connected in parallel with the main circuit. A main interrupting part a51 (a contact) for the purpose of interrupting current flowing mainly in the main circuit, connected to the main circuit part, and a resistor 53 and a resistance interrupting part b52 (b contact) in parallel with the main interrupting part a51 This is a circuit configuration in which series bodies are connected. In this circuit breaking operation, first, the main breaking part 51 commutates the breaking current to the circuit of the resistor 53, and then the breaking current limited by the resistor 53 is cut off by the resistance breaking part 52, thereby completing the breaking. Since the resistor is inserted into the circuit during the interruption, the overvoltage generated at the interruption is suppressed. On the other hand, in the closing operation, the main blocking unit 51 and the resistance blocking unit 52 are switched on almost simultaneously. When it is necessary to suppress the overvoltage at the time of turning on, the resistance blocking unit 52 may be turned on before the main blocking unit 1.
[0024]
The CC sensor 43 detects the completion of blocking, that is, the contact status. The partial discharge measurement is to measure the partial discharge at the time of alternating current application, and to arrange and detect the number of partial discharge pulses exceeding a certain amount of discharge charge generated within a certain time by voltage and time.
[0025]
In addition to conducting periodic insulation diagnosis, the line with special laying conditions such as land subsidence, one line for customer supply, and a line with a lot of accident hysteresis are also individually and as needed. The main insulation monitoring methods other than partial discharge measurement are as follows.
[0026]
(1) DC leakage current measurement Apply a constant DC voltage between the conductor and sheath of the cable, sort out the magnitude, change, three-phase imbalance, etc. of the leakage current by time, and examine the insulation state from the shape and value.
[0027]
(2) Insulating oil survey Collect the insulating oil of the cable and measure the dielectric properties, gas content, etc., and examine the degree of deterioration.
[0028]
(3) Measurement by radiography Using X-rays or γ-rays, the abnormal state of the internal structure of the cable or connection is examined.
[0029]
(4) Insulating gas survey Collect the insulating gas from the gas-insulated cable, measure moisture, insulation resistance, etc., and examine the degree of insulation deterioration.
[0030]
Examples of external diagnostic techniques include oil-in-gas distribution in transformers, GIS corona / ultrasound, and X-ray diagnosis. These are used for management during equipment installation, inspection, or as countermeasures for similar equipment. In order to perform efficient and effective maintenance, the equipment status is continuously and quantitatively monitored and monitored.
[0031]
The OS functions that support tuning include the following.
[0032]
(A) Performance data collection tool This tool collects various types of performance data on a system that is actually in operation. By referring to this measurement report, whether the required performance has been achieved, system resources are insufficient. Check if it is not.
[0033]
There are two methods for collecting performance data: a hardware monitor and a software monitor.
[0034]
(B) Performance Prediction Tool A tool for predicting system performance by simulation, and evaluates the performance of a new system before configuring or changing the system.
[0035]
(C) Automatic tuning Tuning dynamically performed by the OS during system operation is employed.
[0036]
The monitoring output function of the monitoring device 11 is as follows. However, these contents are well-known matters.
[0037]
(1) Operation / display / record output function: Operation status monitoring / status change monitoring, abnormal fault monitoring, automatic scan monitoring, demand monitoring, selected digital measurement / display, CRT display, CRT hard copy, daily / monthly / annual report creation Table, abnormality / failure / operation record, operation record, automatic meter reading / use charge billing, operation guide display.
[0038]
(2) Automatic control output function: Automatic schedule start / stop, power failure / recovery processing, number control (transformer / condenser, refrigerator / cooling tower, boiler, pump, blower, etc.), load limit control (power / region) (When heat source demand is exceeded, private power generation, etc.), disaster prevention equipment control, optimal / predictive control (cold / hot water heat storage, outside air intake, automatic setting of optimum values for various set values, automatic start / stop time automatic setting, etc.).
[0039]
The monitoring center 2 immediately receives the detected first detection value indicating at least the current input and switching input to the circuit breaker via the communication network (1), and stores the first detection value in the database 13 of the substation server 12 Various information including the second detection value by the discharge measurement and other measurement values are received at any time via the communication network (2), and various information including the first detection value, the second detection value, and other measurement values. Is used to monitor circuit breaker characteristics, monitor partial discharge, and perform trend diagnosis and remaining life evaluation of substation equipment. The received information is stored in the database 16 of its own monitoring server 15.
[0040]
FIG. 4 shows the partial discharge monitoring status and the status evaluated based on the monitoring data. Discharge pulses are measured by the CH1, CH2, and CH3 sensors and displayed on the screen, and the partial discharge status at 300 MHz and 900 to 1500 MHz is grasped as shown in the evaluation diagram.
[0041]
FIG. 5 shows the situation evaluated based on the circuit breaker specific monitoring situation and the monitoring data. The CT sensor, TC sensor, and CC sensor detect the current value, switching command input, contact status, and interruption sound, and display them on the screen. The evaluation results shown in the evaluation diagram are displayed on the screen. The contact deterioration state is estimated from the current at the time of interruption, the mechanical part abnormality is detected from the transition of the contact opening point, the contact state Time 1 and Time 2 of the contacts a and b are detected, and the circuit breaker operation is performed by checking the waveform of the interruption sound Detects slack and wear of machine springs.
[0042]
FIG. 6 is a screen display of the cutoff characteristic with the monitoring status as a time axis as a trend. The difference is compared with the previous database.
[0043]
The partial discharge monitoring and the circuit breaker characteristic monitoring are always important, and the current input 5, the switching command input 6, and the contact status information are immediately received by the monitoring center 2, and the monitoring status, its evaluation, and the train are displayed on the screen.
[0044]
As for other information, the database 13 is visited from time to time. Necessary data is transferred to the database 16 to be monitored data, evaluation and trend analysis are performed, and the result is displayed on the screen.
[0045]
FIG. 7 shows a typical partial discharge pattern. In the figure, the frequency spectrum and phase spectrum when there is a protrusion on the conductor, when there is a free foreign object, when there is a foreign object in the spacer, when there is a void in the spacer, and when there is communication by a mobile phone, are shown. Further, by monitoring the phase spectrum, it is possible to distinguish the protrusions on the conductor, the presence of free foreign matter, the presence of foreign matter on the spacer, the presence of voids in the spacer, or the communication sound from the mobile phone.
[0046]
【The invention's effect】
As described above, according to the present invention, the data required for substation monitoring is divided into two types, divided into data that is always required and data that is required to be input at any time, and 24 hours on-call is performed. As a result, information can be unified, and trend management can be performed at low cost, and at high speed and speed.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a detailed view of a partial facility of the substation shown in the block diagram.
FIG. 3 is a contact circuit diagram.
FIG. 4 is a diagram illustrating an example of a monitoring situation.
FIG. 5 is a diagram illustrating an example of a monitoring situation.
FIG. 6 is a trend diagram based on monitoring data.
FIG. 7 is a typical partial discharge pattern diagram.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Substation, 2 ... Monitoring center, 3 ... Telephone network (1), 4 ... Telephone network (2), 5 ... Current input, 6 ... Opening / closing command input, 7 ... Various input / output information, 8 ... Partial discharge measurement, 9 ... Other measurements 10, 10a, 10b ... Data collection device, 11 ... Monitoring device, 12 ... Substation server, 13 ... Database, 15 ... Monitoring server, 16 ... Database, 17 ... Characteristic monitoring, 18 ... Evaluation, 19 ... trends.

Claims (3)

In a remote monitoring system for predictive maintenance or remaining life assessment by external diagnosis of various substation equipment at remote locations,
Current input for at least breaker, transmitting a first detection value by detecting the switching command input immediately the monitoring center monitoring device via the communications network (1),
A first detection value, accumulates a second detection value due to partial discharge measurements various facilities of the substation, and the contact of the blocking portion of the circuit breaker (contacts) information and blocking sound information to the substation server Build a database,
The monitoring device includes a first detection value, a second detection value input as needed via the communication network (2), and information including the contact information and interruption sound information. A remote monitoring system for substation facilities, which performs trend diagnosis and remaining life evaluation of various facilities in substations. In a remote monitoring method for predictive maintenance or remaining life assessment by external diagnosis of various substation equipment in remote locations,
The detected first value indicating at least current input and switching input to the circuit breaker is immediately received via the communication network (1),
Receiving the second detection value by the partial discharge measurement accumulated in the substation server, the information including the contact information of the circuit breaker of the circuit breaker and the sound insulation information via the communication network (2) at any time;
Using the first detection value, the measurement value including the second detection value, and the contact information and the interrupting sound, circuit breaker characteristic monitoring, partial discharge monitoring, and substation equipment trend diagnosis and remaining life evaluation are performed. A method for remotely monitoring a substation facility.   3. The remote monitoring method for substation equipment according to claim 1, wherein frequency spectrum and phase spectrum measurement are used for partial discharge measurement.

Images