JPS6074917A - Information processor for protecting and controlling system of electric station - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to protection and control systems for power plants, substations, and switchyard rain electricity stations. In control systems, information processing is used to efficiently and functionally interface digital protection relays and control systems with current transformers, voltage conditioners, and various electric devices (breakers, disconnectors, etc.). It concerns the Pli device. [Technical background of the invention and its melting point] Conventional protection and control systems for electrical stations are all processed using analog information, with the exception of some protection relay devices.

For example, current information such as tI is routed through the current transformer's 2/KLg circuit and introduced into the interview, protection relay, and control system, and no special data processing is required, and insulation is also provided separately, such as with protection relay devices. We are taking measures where necessary. On the other hand, device control commands output from the protection/control system are also performed by electrical transfer by connecting control cables to each first independently.

Therefore, there is no information processing device (!) in conventional systems.

However, in recent years, with the digitization of protection and control systems at electrical stations, voltages that were previously processed using analog
The amount of current is converted into digital information and sent to the optical fiber A4-
Digital transmission through the Internet has led to the use of digital hush relays and digital control systems. In this case, the optimal information format for each type of protection relay (power transmission line protection relay, transformer 4 protection relay, busbar protection relay, etc.) and control system is different, so it is necessary to convert it into digital data suitable for each. .

On the other hand, these protection relays and ffl! Equipment control commands (cutoff, input commands, etc.) sent by the system are also transmitted digitally via optical fibers, etc., so it is impossible to pass the information to the equipment in its original form, and contact information is It is necessary to replace it with the interface ``T''.

It is true that the hardware configuration of the data processing and other interfacing parts is
SI etc) must be used, and therefore noise or surges from the primary system (such as SI etc.) must be used.
As a countermeasure against opening/closing surges of T-path devices entering via control cables, etc., it is necessary to take measures to ensure that no light is transmitted.

[Purpose of the invention]

The present invention is to adjust and provide suitable upstream digital data to each of the four protection and control systems, and to interface equipment control commands output from each protection and control system in a form suitable for each equipment. Further, it is an object of the present invention to provide an information processing device for a protection/control system of an electrical station whose main function is to provide insulation from the primary circuit.

[Summary of the invention]

In order to achieve the above object, the present invention provides a digital protection and control system for electric power stations that insulates power system voltage, current, power equipment switching information, etc. necessary for protection and control functions, and provides a digital protection relay. The digital data is adjusted and provided in the optimal form as input information to the control system, and information such as equipment control commands output from the same control system is adjusted and provided under conditions suitable for controlling each power equipment. Features an interface.

``Embodiments of the Invention'' The present invention will be described below with reference to the drawings. FIG. The system is drawn as a block diagram based on the single-line diagram.

In the figure, eBl is the breaker for the transmission line 1L, CB2 is the breaker for the transformer puncture Tr, and CB3) is the breaker for the transmission line 2L.
CB4 indicates a bus tie breaker. Also, LS (llh circuit unit), FD (voltage transformer) C
T (current transformer) etc. are also the above-mentioned breaker (2 standards. 1 to 4 are each power transmission line LL, 2L and transformer) q Tr + = corresponding information processing device according to the present invention, 5 Toba power transmission line LL 8 is a digital control system for measuring and controlling each device, 9 is a protective digital relay for the transformer Tr, and 10 is the information processing unit f! of the present invention. A digital transmission medium that connects the J8 device, each digital relay, and a digital control system, and is composed of optical fibers.

Figure 1 is an example of an all-digital protection/control system configuration, and there are other systems that can be considered.

Further, in FIG. 1, the information processing devices 1 to 4 are connected to each digital relay and control system in a radial manner.

(the part indicated by 10), but this can also be a loop connection.

As can be seen from the figure, all upstream information such as current, voltage information, and device information, and downstream information such as device control commands from protection relays and control systems are passed through the information processing devices 1 to 4 of the present invention.

Figure 2 also shows information processing equipment, current transformers, voltage transformers, -
The details of the interaction between upstream information such as next equipment (CB, LS, etc.), pallet (auxiliary contact information indicating the opening/closing status of equipment) and downlink information such as equipment control commands (shutoff/on) are shown using a power transmission line IL as an example. It is a figure shown for.

In the figure, ■ indicates an information processing device of the present invention, 5 indicates a digital relay for power transmission line IL protection, 7 indicates a digital relay for busbar protection, and 8 indicates a digital control device.

11 is a voltage sword, 12A is a control command (turning on, cutting off) to the grounding device ESI, 12B is pallet information for knowing the status of the grounding device ESI, L3A, 13B,
14A, 14B, 16A, 16B, 1
&A.

The same applies to 18B, 19A, and 19B, and 15.
17 is a current input.

Especially voltage input 11. Regarding the current inputs 15 and 17, the input to this device l is analog information, and this may be replaced with analog/digital within this device, or each input 11
, 15.17 may already be digitized. On the other hand, 2OA indicates digital data converted into information suitable for the digital power transmission line protection relay 5 by this device f1, and 20B indicates equipment control commands (trip commands r, (etc.) output from the same relay 5. .These data 2
The OA, 20B is transmitted via a transmission medium such as an optical fiber.

Similarly, 2LA indicates digital data converted into information suitable for the busbar protection digital relay 7 by this device 1, and 21B indicates a control command output from the relay 7. Further, the data 22A and 22B are also information exchanged between the device 1 and the control system 8, and are the same as described above.

In this way, DT transformer, voltage transformer information, and each bar equipment information are converted into digital data suitable for each relay system and control system as upstream information, while each relay and 1b
Furthermore, FIG. 3 is a diagram showing an example of the configuration of digital data as an example of converting upstream information.

In the figure, SF is a 14β frame, which is composed of IO words, and each word is composed of, for example, 12 data bits. SY is the synchronization signal word, and the following 1□
~Eng. is each phase current information, ■6 to ■.

is each phase tow pressure information, ON10FF is breaker CDI information, next 0N10FF is disconnector LSl' clearing information, and X is other information.

The figure is just an example to show the concept.

In this way, the shape suitable for each system (for example, in this example, current,
Three-phase instantaneous value data of voltage and breaker (, '81, ##
One of the important functions of this information processing device is to convert the information into state data (of the LSI).

Next, details 24 of an example of the configuration of the information processing device of the present invention will be described.
11 is shown in FIG. 4 for the power transmission line LL.

In FIG.
PS),) Lip coil (TC), Closing coil (CC)
) etc. will be inherited. Therefore, this is a region where noise surges can enter. On the other hand, IB is a part that is connected face-to-face with the primary device indicated by IA, and is separated and insulated via an optical or isolation transformer to prevent noise surges from entering. This is one of the important functions. As a result, sufficient measures can be taken against external noise and surges to the part where a large number of electric/nics elements are present.

(However, it is natural to take other shield measures into consideration.) 5 is the power transmission line protection digital relay shown above, 8 is the digital control system, and the bus bar protection relay is omitted.

23 is a control power supply that is normally a DC 110 for controlling the connection of next-generation weapons, etc., and acquiring equipment information (pallets, etc.).
V (P is its positive electrode) is used. 24A to 24C are X for optically interfacing the device's palette I.
The optical-to-optical converters 25A to 25C are the optical-to-electrical converters 26A for converting the same information back into electrical signals.

26B is an analog-to-digital converter that converts the voltage and current introduced through the isolation transformer into analog and digital data, and 27A is a parallel-to-serial converter (that converts various information into optimal data required by the power transmission line protection relay). (Digital data as shown in Figure 3 above is created in this part), 32A is an electric-to-optical converter for transmitting the same information to the relay by light, and 32B is for converting the optical information output from the relay into an electrical signal. The optical-to-electrical converter 27B is a serial-to-parallel converter that converts the same digital serial data into appropriate parallel information, and 29A and 29B optically convert the information (control command) obtained from the serial-to-parallel converter 27B. A command is given to the optical trigger thyristor shown at 34. Here, 34 is shown as an optical trigger thyristor, but it may also be configured with an auxiliary relay or the like.

In addition, upstream and downstream information is configured for the control system 8 as in the case of the transmission line protection relay 5, but
The functions of each part are exactly the same, so explanations will be omitted.

In this way, by providing an information processing device with the configuration shown in FIG. 4, substation digital cold storage! li'l?
The 1l11 system can be used efficiently and without causing unnecessary damage to hardware such as electronic elements.

Note that FIG. 4 merely shows the configuration of one embodiment of the present invention.
The NL of the present invention is as follows: (1) Adjust the optimal digital data as input information to the digital protection/control system.

(11) Interface equipment control commands, etc. output from the digital protection/city control system with primary equipment.

) Insulate the electronics section necessary for data conversion, etc., to protect it from noise surges that enter from the connection cable with the burial vessel.

Any configuration may be used as long as the above conditions are met.1.Also, the preferred location for installing the rinsing information processing device of the present invention is a location adjacent to the next appliance, but for example, a centrally controlled location. It can also be installed somewhat far away, such as in a room.

〔Effect of the invention〕

According to the present invention as described above, an information processing system for a protection and control system of a power station is capable of adjusting various IT information of a power system and a power system constituting the power system into an optimal form of digital data. Can house devices.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing an example of the entire all-digital capture and control system for a substation including the information processing device of the present invention, and FIG. 2 is a conceptual diagram showing input/output information to the information processing device. Figure 3 is a diagram showing an example of the arrangement, and Figure 4 is a diagram showing an example of digital data conveniently used for the &KW relay.
FIG. 1 is a detailed diagram of an example of the configuration of an information processing device of the present invention. 1.2, 3.4... Information processing device 5.6.7.9... Digital relay 8... Digital control system 10... Digital transmission medium CB... Disconnection LS... Between songs 6 instruments P D j
&If 'jL formation Z) CT - transformer P S
...Pallet switch CC...Shiya...1 input coil TC...Trip coil agent for circuit breaker Patent attorney Nori Kei Yu (and 1 other person) Figure 1

Claims (1)

[Claims] In digitalized electric power station protection and control systems, the voltage, current, and switching information of power equipment required for protection and control functions are insulated, and the information is input to digital protection relays and control systems. n1AI for the optimal form of digital communication! On the other hand, the same work ~ ・Protection of an electrical plant characterized by interfacing information such as equipment control commands output from a control system under conditions suitable for controlling each power equipment face-to-face. - Information processing equipment for control systems.