17.220.01 电学、磁学综合 标准查询与下载

DIN EN 60909-0 Bb.3:2003 三相交流系统短路电流.按照IEC 60909-0:2002计算短路电流时使用的运算因子

Short-circuit currents in three-phase a.c. systems - Factors for the calculation of short-circuit currents according to IEC 60909-0 (IEC/TR 60909-1:2002)

IEC 60375:2003 关于电路和磁路的规定

Lays down rules for signs and reference directions and reference polarities for electric currents and voltages in electric networks, as well as for the corresponding quantities in magnetic circuits.

Conventions concerning electric and magnetic circuits

VDI/VDE/DGQ/DKD 2622 Blatt 2-2003 电量测量装置的校准 测量不确定度的测定方法

The guideline gives instructions for how to proceed in the calibration of measuring means for electrical quantities, which are frequently used (Part 3 foll.). In Part 1, ist also deals with the bases common to all its parts. In the present Part 2, simplified methods for the determination of the measurement uncertainty in the calibration of measuring means for electrical quantities are described. Part 2 relates to the calculation of the measurement uncertainty in the calibration of a measuring means. For practical purposes, the procedures are represented in a simplified form. They are, however, in conformity with the publications given in the references.

Calibration of measuring means for electrical quantities - Methods for the determination of the measurement uncertainty

UL 61010B-1-2003 电气测量和试验设备.第1部分:一般要求

1．1 Scope This International Standard specifies general safety professional，industrial process，and educational use measu rement and test requirements for electrical equipment intended for including equipment and computing devices for： control， laboratory use； accessories intended for use with the above(e g sample handling equipment This Part 1 of the standard applies to the equipment defined in a)to c)below，when used under the environmental conditions of 1 4 a)Electrical measurement and test equipment This is equipment which by electrical means measu res，indicates or records one or more electrical or non-electrical quantities，also non-measu ring equipment such as signal generators measu rement standards，power supplies，transducers，transmitters，etc NOTE—All indicating and recording electrical measuring instruments(except those excluded in 1．1．2) fall within the scope of this standard unless they are panel meters designed only for building-in to other equipment．Built-in panel meters are considered as components and only need to meet the relevant requirements of IEC 1010，or other standards，as part of the equipment into which they are built b)Electrical control equipment This is equipment which controls one or more output quantities to specific values，with each value determined by manual setting，by local or remote programming，or by one or more input variables c)Electrical laboratory equipment This is equipment which measures，indicates，monitors or analyses substances，or is used to prepare materials This equipment may also be used in areas other than laboratories 1．1DV．1 DE Modification Delete”industrial process”and delete the second and third dashes frOm the fi rst paragraph fUL 61010A-1 and UL 61010C-1 apply)． Copyright．by the UndenrriLers LaboraLories]nc

UL Standard for Safety Electrical Measuring and Test Equipment; Part 1: General Requirements First Edition

DS/EN 60909-0:2003 三相交流系统中的短路电流 第0部分：电流计算

This part of IEC 60909 is applicable to the calculation of short-circuit currents: . in low-voltage three-phase a.c. systems; . in high-voltage three-phase a.c. systems; operating at a nominal frequency of 50 Hz or 60 Hz. Systems at highest voltages of 550 kV and above with long transmission lines need special consideration. This part of IEC 60909 establishes a general, practicable and concise procedure leading to results, which are generally of acceptable accuracy. For this calculation method, an equivalent voltage source at the short-circuit location is introduced. This does not exclude the use of special methods, for example the superposition method, adj

Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents

ANSI/ESD S541-2003 静电放电敏感性物件的防护.包装材料或ESD敏感件

Applies to packaging used to store, transport, and protect ESDS electronic items during all phases of production and distribution. This document does not address protection from EMI/RFI/EMP or protection of volatile materials. ESD protective packaging is a requirement of the overall ESD control program ANSI/ESDS20.20.

Protection of Electrostatic Discharge Susceptible Items - Packaging Materials or ESD Sensitive Items

DIN EN 60909-0 Bb.1:2002 三相交流系统的短路电流.第0部分:短路交流电的计算范例 (IEC/TR 60909-4:2000)

Short-circuit currents in three-phase a.c. systems - Part 0: Examples for the calculation of short-circuit currents (IEC/TR 60909-4:2000)

NF C10-120:2002 三相交流电系统内短路电流.第0部分:电流的计算

Short-circuit currents in three-phase a.c.systems - Part 0 : calculation of currents.

DIN EN 60909-0:2002 三相交流系统的短路电流.第0部分:电流计算 (IEC 60909-0:2001); 德文版本 EN 60909-0:2001

Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents (IEC 60909-0:2001); German version EN 60909-0:2001

KS C 0263-2002(2017) 电阻锗的测试方法

Testing methods of resistivity germanium

KS C 0256-2002(2022) 硅晶体和硅片电阻率的四点探针测试方法

Testing method of resistivity for silicon crystals and silicon wafers with four - point probe

KS C 0263-2002(2022) 锗电阻率测试方法

Testing methods of resistivity germanium

KS C 0256-2002(2017) 具有四点探针的硅晶体和硅晶片的电阻率测试方法

Testing method of resistivity for silicon crystals and silicon wafers with four - point probe

IEC 60909-0:2001/COR1:2002 三相交流系统的短路电流.第0部分:电流计算

This standard is Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents; Corrigendum 1.

Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents

AS/NZS 60990:2002 给水用1/2 In.(12 mm)到2 In.(50 mm)聚乙烯-铝-聚乙烯和交联聚乙烯-铝-交联聚乙烯复合压力管

Defines methods for measuring electric currents flowing through the human body or through the protective conductor. This Standard is identical with, and has been reproduced from, IEC 60990:1999.

Methods of measurement of touch current and protective conductor current

BS EN 60909-0:2001 三相交流系统内短路电流.电流的计算

This part of IEC 60909 is applicable to the calculation of short-circuit currents: · in low-voltage three-phase a.c. systems · in high-voltage three-phase a.c. systems operating at a nominal frequency of 50 Hz or 60 Hz. Systems at highest voltages of 550 kV and above with long transmission lines need special consideration. This part of IEC 60909 establishes a general, practicable and concise procedure leading to results, which are generally of acceptable accuracy. For this calculation method, an equivalent voltage source at the short-circuit location is introduced. This does not exclude the use of special methods, for example the superposition method, adjusted to particular circumstances, if they give at least the same precision. The superposition method gives the short-circuit current related to the one load flow presupposed. This method, therefore, does not necessarily lead to the maximum short-circuit current. This part of IEC 60909 deals with the calculation of short-circuit currents in the case of balanced or unbalanced short circuits. In case of an accidental or intentional conductive path between one line conductor and local earth, the following two cases must be clearly distinguished with regard to their different physical properties and effects (resulting in different requirements for their calculation): · line-to-earth short circuit, occurring in a solidly earthed neutral system or an impedance earthed neutral system; · a single line-to-earth fault, occurring in an isolated neutral earthed system or a resonance earthed neutral system. This fault is beyond the scope of, and is therefore not dealt with in, this standard. For currents during two separate simultaneous single-phase line-to-earth short circuits in an isolated neutral system or a resonance earthed neutral system, see IEC 60909-3. Short-circuit currents and short-circuit impedances may also be determined by system tests, by measurement on a network analyzer, or with a digital computer. In existing low-voltage systems it is possible to determine the short-circuit impedance on the basis of measurements at the location of the prospective short circuit considered. The calculation of the short-circuit impedance is in general based on the rated data of the electrical equipment and the topological arrangement of the system and has the advantage of being possible both for existing systems and for systems at the planning stage. In general, two short-circuit currents, which differ in their magnitude, are to be calculated: · the maximum short-circuit current which determines the capacity or rating of electrical equipment; and · the minimum short-circuit current which can be a basis, for example, for the selection of fuses, for the setting of protective devices, and for checking the run-up of motors. NOTE The current in a three-phase short circuit is assumed to be made simultaneously in all poles. Investigations of non-simultaneous short circuits, which may lead to higher aperiodic components of short-circuit current, are beyond the scope of this standard. This standard does not cover short-circuit currents deliberately created under controlled conditions (short-circuit testing stations). This part of IEC 60909 does not deal with the calculation of short-circuit currents in installations on board ships and aeroplanes.

Short-circuit currents in three-phase a.c. systems - Calculation of currents

IEC 60909-0:2001 三相交流系统短路电流 第0部分：电流计算

This part of IEC 60909 is applicable to the calculation of short-circuit currents: · in low-voltage three-phase a.c. systems · in high-voltage three-phase a.c. systems operating at a nominal frequency of 50 Hz or 60 Hz. Systems at highest voltages of 550 kV and above with long transmission lines need special consideration. This part of IEC 60909 establishes a general, practicable and concise procedure leading to results, which are generally of acceptable accuracy. For this calculation method, an equivalent voltage source at the short-circuit location is introduced. This does not exclude the use of special methods, for example the superposition method, adjusted to particular circumstances, if they give at least the same precision. The superposition method gives the short-circuit current related to the one load flow presupposed. This method, therefore, does not necessarily lead to the maximum short-circuit current. This part of IEC 60909 deals with the calculation of short-circuit currents in the case of balanced or unbalanced short circuits. In case of an accidental or intentional conductive path between one line conductor and local earth, the following two cases must be clearly distinguished with regard to their different physical properties and effects (resulting in different requirements for their calculation): · line-to-earth short circuit, occurring in a solidly earthed neutral system or an impedance earthed neutral system; · a single line-to-earth fault, occurring in an isolated neutral earthed system or a resonance earthed neutral system. This fault is beyond the scope of, and is therefore not dealt with in, this standard. For currents during two separate simultaneous single-phase line-to-earth short circuits in an isolated neutral system or a resonance earthed neutral system, see IEC 60909-3. Short-circuit currents and short-circuit impedances may also be determined by system tests, by measurement on a network analyzer, or with a digital computer. In existing low-voltage systems it is possible to determine the short-circuit impedance on the basis of measurements at the location of the prospective short circuit considered. The calculation of the short-circuit impedance is in general based on the rated data of the electrical equipment and the topological arrangement of the system and has the advantage of being possible both for existing systems and for systems at the planning stage. In general, two short-circuit currents, which differ in their magnitude, are to be calculated: · the maximum short-circuit current which determines the capacity or rating of electrical equipment; and · the minimum short-circuit current which can be a basis, for example, for the selection of fuses, for the setting of protective devices, and for checking the run-up of motors. NOTE The current in a three-phase short circuit is assumed to be made simultaneously in all poles. Investigations of non-simultaneous short circuits, which may lead to higher aperiodic components of short-circuit current, are beyond the scope of this standard. This standard does not cover short-circuit currents deliberately created under controlled conditions (short-circuit testing stations). This part of IEC 60909 does not deal with the calculation of short-circuit currents in installations on board ships and aeroplanes.

Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents

IEC TR 60909-4:2000 三相交流系统中的短路电流 第4部分:短路电流计算举例

This part of IEC 60909 is a technical report intended to give help for the application of IEC 60909-0 for the calculation of short-circuit currents in 50 Hz or 60 Hz three-phase a.c. systems. This technical report does not include additional requirements but gives support for the modelling of electrical equipment in the positive-sequence, the negative-sequence and the zero-sequence system (clause 2) and the practical execution of calculations in a low-voltage system (clause 3), a medium-voltage system with asynchronous motors (clause 4) and a power-station unit with its auxiliary network feeding a large number of medium-voltage asynchronous motors and low-voltage motor groups (clause 5). The three examples given in clauses 3, 4 and 5 are similar to those given in IEC 60909 (1988) but they are revised in accordance with IEC 60909-0, which replaces it. A subclause is added to the example in clause 3 to give a comparison between the results found with the application of the equivalent voltage source at the short-circuit location following the procedure given in IEC 60909-0 on the one hand, and results found with the superposition method on the other hand, taking into account different load-flow conditions before the short circuit. Clause 6 of this technical report gives the circuit diagram and the data of a test network and the results for a calculation carried out in accordance with IEC 60909-0, to offer the possibility for a comparison between the results found with a digital program for the calculation of short-circuit currents and the given results for Ik", ip, Ib, Ik, Ik1" and ip1 in a high-voltage network with power-station units, generators, asynchronous motors and lines in four different voltage levels 380 kV, 110 kV, 30 kV and 10 kV.

Short-circuit currents in three-phase a.c. systems - Part 4: Examples for the calculation of short-circuit currents

BS EN 60059:1999+A1:2009 IEC 标准额定电流

This standard specifies standard current ratings for electrical devices, apparatus, instruments and equipment text deleted. This standard does not apply to current ratings of components and parts used within electrical devices or items of equipment.

IEC standard current ratings

IEC 60059:1999 IEC标准电流额定值

This standard specifies standard current ratings for electrical devices, apparatus, instruments and equipment and should be applied to the designing of utilization systems or equipment as well as to operating characteristics. This standard does not apply to current ratings of components and parts used within electrical devices or items of equipment.

IEC standard current ratings