1、BSI BS*EN*bl33- I 9b 9 lb2Ybb9 0545b3b 3bb BRITISH STANDARD Measuring relays and protection equipment - Protection communication interfacing Part 1. General The European Standard EN 61733-1 : 1996 has the status of a British Standard ICs 29.120.70; 35.200 NO COPYiNG WITHOUT BSI PERMISSION EXCEPT AS
2、PERMIWED BY COPYRIGHT LAM 3s EN i1733-1: 1996 EC 1733-1 : 1995 ES1 BStEN*bL733- II 36 1624669 0545b37 2T2 B$ EN 61733-1 : 19% Amd. No. Date Committees responsible for this British Standard Text affected The preparation of this British Standard was entnisted to Technical Committee PEL b) typical info
3、rmation interchange in an electrical installation; c) needs for communication between digital protection equipment and related monitoring and control devices: d) the transmission media. The main links between other IEC committees and TC 95 are shown in the following block diagram. l Page 4 BSI ES*EM
4、*b1733- 1 96 = 1624669 0545643 5Tb EN 61733-1 : 1996 TC 21 Secondary cells and batteries (Auxiliary supply) : IC* TC 38 Instrument transformers (Tele protection) (SC 65C: Digital communications) A i . . Switchgear and (AC input circuits) (Trip and closing circuits) Figure 1 - Block diagram of main l
5、inks of TC 95 with other IEC committees - Page 6 BSI BS*EN*bL33- L 96 Lb2Ybb 0545644 432 EN 61733-1 : 1996 MEASURING RELAYS AND PROTECTION EQUIPMENT - PROTECTION COMMUNICATION INTER FACING - Part 1: General 1 Scope and object This part of IEC 1733 applies to standardisation of protection communicati
6、on interfacing for digital protection equipment and related control and monitoring devices to be used in the same electrical installation. This standard gives general information about the functional levels in a hierarchical structure and about the typical organisation of devices communicating in an
7、 open system. In this standard, an electrical installation refers to substations for voltage levels above 1 kV and power stations. Communication outside a particular electrical installation (for example communication between a substation and a remote control centre or another substation) is outside
8、the scope of this standard. Communication between dedicated devices provided by the same manufacturer, for example differential protection schemes, is outside the scope of this series of standards. 2 Normative references lhe following normative documents contain provisions which, through reference i
9、n this text, constitute provisions of this part of IEC 1733. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 1733 are encouraged to investigate the possibility of applying the most rec
10、ent editions of the normative documents indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IEC 255, Electrical relays IS0 7498: 1984, Information processing systems - Open Systems Interconnection - Basic Reference Model 3 Definitions For the purpos
11、e of this patt of IEC 1733 the following definitions apply: 3.1 protection communication interfacing: Interfacing that allows the interconnectivity and interoperability between protection, monitoring and control devices, built by different manufacturers installed in the same electrical installation.
12、 BSI BS*EN*bl1733- L qb m Lb24bbq 0545645 379 Page 6 EN 61733-1 : 1996 3.2 communication between them. hierarchical system: System organised in different hierarchical functional levels .with 3.3 interconnectivity: Capability of devices to exchange data (see figure 5). 3.4 information (see figure 5).
13、 interoperability: Capability of different devices to exchange commonly understandable 3.5 interchangeability: Capability of different devices, built by different manufacturers, to be interchanged with one another without modifying the system operating characteristics (see figure 5). 3.6 elements vi
14、a the communication network. communication element: Part of a connected device which communicates with other 3.7 communication interface (physical and logical): Interface of a device, operating in an open system, that allows exchange of information between devices of the same or different functional
15、 levels in a hierarchical system (for example between distributed unit devices and a centralized equipment). 3.8 connector: Coupling device employed to connect the medium of one circuit or communication element with that of another circuit or communication element. 3.9 control element and/or a final
16、 element (transducer, actuator, etc.). device: Physical entity connected to the communication network which may have a 4 Types of information identifiable in an electrical installation Figure 2 shows a typical information flow within a feeder unit. The typical information flow in an electrical insta
17、llation can be grouped into the following six categories: a) position information (for example, position of disconnectors and circuit-breakers); b) commands (for example closing and opening commands of disconnectors and circuit- breakers): c) anomalies and status information (of the different device
18、s of the electrical installation); d) measurands; e) fault information, for example from protection devices; 1) parameter information (settings, etc.). 5 Typical structure of a hierarchical system 5.1 Structure of a hierarchical system Figure 3 shows a typical functional structure of an electrical i
19、nstallation (for example an EHV/HV substation) organised in a hierarchical system. There are three functional levels: BSI BS*EN*bL733- II 96 I1624669 0545646 205 = Page 7 EN 61733-1 : 1996 a) level O: process level this level includes the primary equipment (instrument transformers, circuit breakers,
20、 disconnectors, etc.). b) level 1: unit level this level includes functions directly related to primary equipment, for example: - monitoring and metering; - protection; - automatic reclosing; - control. c) level 2: substation level this level includes common substation functions, for example: - moni
21、toring and metering; - control; - telemetry and telecontrol. 5.2 Information exchange Figure 3 shows a block diagram of a typical EHV/HV substation. The information (analog and/or digital) can be exchanged between devices operating at the same functional level or between devices operating at differe
22、nt functional levels. The communication between devices may be achieved by either conventional point-to-point connections (medium: multicore cable) and/or a communication network. 6 Communication system arrangement of an electrical installation 6.1 De vice communication The secondary equipment of an
23、 electrical installation includes a number of functions. Each device includes at least two important parts, as shown in figure 4: - communication machine; - application machine. The communication machines connect two or more application machines, via an interface and medium, to allow the exchange of
24、 information. In order to allow the above-mentioned exchange of information, the transmission protocol(s) shall be compatible, in all cases where communication between devices of different manufacturers is required. The communication machine as shown in figure 4 usually includes both hardware (commu
25、nication chips, controller, transceivers) and software and is designed by the device manufacturer. The communication sub-system includes the physical medium and the communication machine of communicating devices: this is shown by the dashed zone in figure 4. 6.2 Model of an intelligent device Figure
26、s 5 and 6 show a more detailed representation of intelligent distributed communicating devices. Referring to figure 5 the lower connecting terminals represent the physical connection between the device and the process, for example in the case of a protection equipment the connecting terminals needed
27、 to connect the CTs, VTs and circuit-breaker, etc., via a point-to-point conventional link (cable). In the communicating device (D) the block application machine can be sub-divided into three parts: a) process interface, whose task is the acquisition of analog signals and the analog to digital signa
28、l conversion. The process interface also sends commands to and receives status from the process (for example circuit breaker). The process interface is dependent on the physical connections to the process and on the electrical signal characteristics. The technology used is usually proprietary to the
29、 manufacturer; b) application algorithms, which provide the device function. The application algorithms include the application functions relative to the system concerned. The application algorithms and the processing techniques used are particular characteristics of any device. The method used to i
30、mplement the application algorithms and the technology used are usually proprietary to the manufacturer; c) system interface, which enables the application machine to communicate with the communication machine through its application layer. The format of the data transmitted shall be compatible with
31、 those of the other devices of an open system in order to guarantee interoperability, for example the meaning of a O value shall be clearly attributed to the position open or closed of a contact. The system interface is directly connected to the communication machine (IS0 layer 7: Application). For
32、the communicating device (D) three different compatibility levels exist as follows: 1) interconnectivity: represents the capability of devices to exchange data. The interconnectivity is provided by the communication sub-system; 2) interoperability: represents the capability of devices to co-operate
33、in an application exchanging significant information. This means that each device can associate the same meaning to each of the received and transmitted data. To ensure interoperability, interconnectivity and common definitions of items exchanged are required. 3) interchangeability: enables the exch
34、ange of a device by another without modifying the system functional characteristics. Interchangeability can be ensured if the same functional characteristics required by the specific application are present in devices of different manufacturers. Figure 6 shows a model of an intelligent distributed c
35、ommunicating device which is not directly connected to the process. It exchanges data and commands with lower and higher level devices through two different communication machines. In this model the task assigned to the layer process interface is the same as that assigned to the layer system interfa
36、ce. ES1 BS*EN*b/733- 1 7b Lb24667 0545648 088 Page 9 EN 61733-1 : 1996 The two communication machines (A) and (B) may be different; for this reason in figure 6 two distinct domains of interconnectivity and interoperability relevant to the two communication sub-systems are shown. 6.3 Standard compati
37、bility levels Three standard compatibility levels are envisaged for the future application of communication between pTotection, monitoring and control devices to be used in an open system of an electrical installation: a) interconnectivity; b) interoperability; c) interchangeability. 7 Standard para
38、meters The following subclauses identify parameters for which standards will be specified in subsequent parts of this standard. 7.1 Communication levels Other parts of this standard consider the following communications between protection equipment and related monitoring and control devices of an el
39、ectrical installation operating: a) in level 1 and level 2 (level 1 ($ level 2 devices); b) inside level 1 (level 1 u level 1 devices). The communication between level O and level 1 may also be considered in other parts of this standard in conjunction with the relevant IEC committees. NOTE - lhe com
40、munication between level 2 and level 3 (remote control centre) is outside the scope of TC 95. 7.2 Communication network characteristics The following communication network characteristics will be considered: a) typical number of communicating devices: 50 - 200 - typical number of units (bays) per in
41、stallation: 5- 60 - typical number of communicating devices per unit: 3- 10 b) typical distance among communicating devices: c) transmission media to be considered: less than 1 km - optical fibre; - shielded cable. In addition standardisation of connectors will be considered: d) redundancy requireme
42、nts; e) availability . 7.3 En vironmental conditions The environmental conditions specified in the relevant parts of IEC 255 shall apply to communicating devices. 7.4 Test requirements The tests to be considered are: a) tests on a single communicating device; b) tests on a system including several c
43、ommunicating devices (commissioning tests). 7.5 Message characteristics The message characteristics to be considered include the following: a) transmission of status and measurands; b) time delay requirements; c) data integrity requirements; d) synchronization; e) maximum number of data for a single
44、 message. ES1 BS*EN*61733- 1 96 = 1624669 0545650 3b Page 11 EN 61733-1 : 1996 Monitoring and metering (M Fax: 0181 996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automaticaily receive the latest editions of standards. Buying standards Orders f
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