1、STD-BSI BS EN b1800-2-ENGL L99 S Lb24bb 073bb40 b9i-I II BRITISH STANDARD Adjustable speed electrical power drive systems - Part 2: General requirements - Rating specifications for low voltage adjustable frequency ax, power drive systems The European Standard EN 61800-21998 has the status of a Briti
2、sh Standard ICs 29.200 NO COPYING WTHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 61800-2: 1998 IEC 61800-2: 1998 STD-BSI BS EN bLOO-2-ENGL 1998 Lb2LibbS 073bb4L 520 = Amd. No. Date BS EN 61800-2:1998 Text affected National foreword This British Standard is the English ianguage vers
3、ion of EN 61800-21998. It is identical with IEC 61802: 1998. The UK participation in its preparation was entrusted to Technical Committee PEIs22, Static power convertor equipment, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible internatio Q is th
4、e total r.m.s. value; h is the harmonic order; Qh is trie r.m.s. value of harmonic component of order h; O can represent either current or voltage. For the purpose of this standard and for clarity, limits are referred to the corresponding rated value. Limits for THD and THF are defined by: THD= and
5、THF= QIN QN NOTE I - These definitions are inaccordance with the second edition of IEV 551 and with common practice. The network voltage waveform is much less distorted than the injected current. Therefore, application of both definitions, total harmonic distortion coefficient THD or total harmonic
6、factor THF, to the voltage provides the same result while the difference is significant when current is considered. NOTE 2 - It is important to note that these definitions include interharmonics. When interharmonics are present the wave form is no longer periodical, which can produce more complex ef
7、fects than those produced by harmonics. If interharmonics are negligible, these equations simplify to: THD= JChTP“eh and THF= Jm QIN QN where QN is the rated r.m.s. value of the fundamental; QN is the rated total r.m.s. value. lhe summation is extended to and includes order 40, according to IEC comm
8、on practice. NOTE 3 - For particular use, the highest frequency content of THD (order h from 14 to 40 inclusive) is named partial harmonic distortion coefficient PHD, and the even content (where order h is only even) is named even harmonic distortion coefficient EHD. Applied to current this gives: a
9、nd EHD= IlN Page 16 EN 61800-2:1998 2.4.9 converter input displacement factor cos 1 cosine of the phase displacement angle between the fundamental phase components of the voltage and current on the input a.c. side of the input power converter 2.4.1 O line-side displacement factor cos al cosine of th
10、e phase displacement angle between the fundamental phase components of the voltage and current on the input a.c. side of the CDM 2.4.1 1 input total power factor, AL ratio of the total power input, to the apparent power, as determined at the connection of the CDM to the supply Example: in a three-ph
11、ase system where the voltage is considered sinusoidal. ;iI. = (U, IL1 fi cos pILJ 1 CU, I, J3 ) = (IL1 14,) x cos pIL1 NOTE 1 -The power factor includes the effect of displacement cos(pi and of harmonics by means of the deformation factor v = A I cos rp. NOTE 2 - The definition applies to the conver
12、ter input (subscript V) or to the CDM input line side (subscript L). 2.4.12 d.c. current /, average value of the current in the d.c. link over one full period of the input power system frequency 2.4.1 3 maximum allowable a.c. system, symmetrical short-circuit current Isc maximum allowable symmetrica
13、l short-circuit current (IscM), as specified on the rating plate can be related to the fundamental component of the line-side rated a.c. current (/LN1) by means of the short-circuit ratio (RSC) RCC is the ratio of the short-circuit power of the source to the fundamental apparent power on the line-si
14、de of the converter(s). (See IEC 60146-1-1) The maximum allowable symmetrical short-circuit current (ISCM) is of importance in the definition of the protection of the converter. At the point of common coupling (PCC), the relative short-circuit power shall be considered (see 1.5.35. of IEC 60146-1-1)
15、. This sc has to be limited to the following RSCM: where ILNI is equal to the fundamental content of IL. Page 17 EN 61800-2:1998 2.5 CDM, BDM and converter output parameters Symbols defined in 2.5 are included in table 1. 2.5.1 rated continuous output current IaN total r.m.s. output current which ca
16、n be supplied continuously without exceeding established limitations, under prescribed operating conditions 2.5.2 overload capability Iam maximum output current which can be supplied, for a specified period of time, without exceeding established limitations under prescribed operating conditions 2.5.
17、3 operating frequency range range of fundamental frequency over which the converters output can be controlled 2.5.4 load-side converter a.c. rated voltage U,N1 RMS value of the rated fundamental voltage at the a.c. terminals of the load-side converter NOTE - This is the voltage which appears at the
18、a.c. terminais of the load-side converter and is not necessarily the fundamental voltage of the motor. 2.5.5 base frequency base frequency of an adjustable frequency drive system is the lowest frequency at which it is capable of delivering maximum output power 2.5.6 rated fundamental output current
19、RMS value of the fundamental component of the output current which can be supplied continuously without exceeding established limits 2.5.7 efficiency of power conversion t, t efficiency 170 of the drive system is the ratio of the power delivered by the motor shaft to the total power drawn from the i
20、nput power supply (see feeding line in figure l), and is usually exprssed as a percentage. Efficiency of the CDM (complete drive module) qc is the ratio of the total output power delivered by the CDM to the motor and auxiliaries (motor ventilation fan, etc.) to the total power drawn from the input p
21、ower supply (see feeding line in figure l), and is usually expressed as a percentage 2.5.8 load-side harmonic content this definition is identical to line-side harmonic content (2.4.6) but determined at the output side of the BDM NOTE - Load-side harmonic content is a function of the Converter wavef
22、orm and load reactance. STD-BSI BS EN bLAOO-2-ENGL 1998 Lb24bb9 073bb57 7b0 W Page 18 EN 61800-2:1998 2.5.9 load-side total harmonic distortion THD, the definition of harmonic distortion (2.4.8) can be applied to the output of the BDM yielding THD, NOTE - Load-side voltage total harmonic distortion
23、is expressed as THDU, and load side current total harmonic distortion is expressed as THDI The difference between THD and THF is significant for both voltage and current. 2.5.1 O rated load power factor cosine of the angle between the motor phase voltage and current, at rated load, with sinusoidal v
24、oltage applied 2.5.1 1 load-side displacement factor this definition is identical to line-side displacement factor (2.4.1 O) but determined at the output side of the BDM 2.5.1 2 quasi-square wave stepped waveform as obtained from the difference of two phase-shifted square waves (one square wave per
25、half period) of equal amplitude. The wave form applies to either voltage or current Mar . . . . . Min _._._ I 120“ I SO0 I 120“ I 60“ I IEC 348/98 Figure 4 - Quasi-square wave 2.5.13 stepped wave waveform obtained from the summation of any number of square waves of the same frequency, each displaced
26、 in time from the others 2.6 Converter circuitry and circuit elements 2.6.1 commutating capacitor capacitor which provides commutating energy for circuit-commutated thyristors in a self- commutated converter 2.6.2 commutating inductor inductor having one or more windings which modifies or couples th
27、e transient current produced during commutation 2.6.3 a.c. filter network network designed to reduce the flow of harmonic currents into the associated power system Page 19 EN 61800-2:1998 2.6.4 power factor correction network network designed to improve the power factor of the associated power syste
28、m. This network will frequently also reduce the flow of harmonic currents 2.6.5 d.c. filter capacitor capacitor connected across the rectifier output within a converter to reduce voltage ripple 2.6.6 d.c. filter inductor inductor Connected in series with the output of the rectifier to reduce ripple
29、current 2.6.7 d.c. filter network combination of d.c. filter capacitor and d.c. filter inductor applied to the d.c. link to reduce voltage ripple and input line harmonics 2.7 Induction motor parameters The following parameter definitions are essential to define induction motor operation with an adju
30、stable frequency converter. Symbols defined in 2.7 are included in table 1 2.7.1 rated motor voltage rated a.c. input voltage as specified on the rating plate of the motor. It is the line-to-line, r.m.s. sinusoidal, motor terminal voltage 2.7.2 rated frequency frequency at which rated motor voltage
31、is defined and which appears on the rating plate 2.7.3 rated motor current a.c. r.m.s. current at rated operating conditions as specified on the rating plate 2.7.4 rated power factor power factor under rated conditions of voltage, frequency, and load 2.7.5 per-unit, relative rotor speed difference b
32、etween synchronous speed at the operating frequency (Na) and the actual rotor speed (N), defined as: slip o 2.7.6 rated slip SN motor slip under rated load conditions Page 20 EN 61800-2:1998 2.7.7 base speed No motor synchronous speed at base frequency 2.7.8 maximum operating speed Nm motor speed at
33、 maximum inverter frequency 2.7.9 minimum operating speed Nmin motor speed at minimum inverter frequency 2.7.1 O maximum safe motor speed Nlmix . maximum designed speed of the motor under which no permanent abnormal mechanical deformation or weakness is introduced (see clause 21 of IEC 60034-1) NOTE
34、 - The maximum safe speed of the driven equipment may be more restrictive. 2.7.1 1 equivalent circuit constants: NOTE - For dynamic performance it is necessary to have the equivalent circuit constants of the individual motor. In addition, for field weakened operation, the ratio between pull-out torq
35、ue and rated torque at rated flux needs to be known. See annex A for typical values. 2.7.12 rated voltage to rated frequency ratio UiN/f.N ratio at which rated air-gap flux exists, providing rated torque per ampere 2.7.13 torque pulsation cyclic fluctuation of a steady state motor torque measured as
36、 a peak-to-peak variation 2.8 Control systems 2.8.1 controlled variable system variable in the feedback control of adjustable frequency a.c. drives. Some examples of controlled variables are voltage, stator current, frequency, speed, slip, and torque 2.8.2 service variable specified variable, usuall
37、y related to ambient conditions (e.g. temperature), for which the feedback control system is to correct in attempting to maintain the ideal value of the controlled variable 2.8.3 operating variable specified variable (e.g. load torque for a speed controlled drive), other than those arising from serv
38、ice conditions and drift, for which the feedback control system is to correct in attempting to maintain the ideal value of the controlled variable 2.8.4 feedback control system variables range of service and operating variables covering the total deviations for which the feedback system attempts to
39、correct by means of the controlled variables. The accuracy of this control is then defined as the width of the band of allowable deviation within which the feedback system will regulate the controlled variable Page 21 EN 61800-2:1998 3 Functional features 3.1 Operational CDM shall include specified
40、features which may include, but are not limited to, one or more of the following features. timed acceleration; timed deceleration; jog; adjustable current limit(s); dynamic braking ; reversing; regeneration; line filtering; input/output data processing (analog/digital); automatic restart; boost; d.c
41、. braking; precharge circuit. 3.2 Fault supervision The CDM shall provide specified fault indication. This may consist of a common alarm and/or trip signal provided via dry relay contact) or static relay(s). The fault indication is normally activated by one or more of the CDM faults which may includ
42、e but are not limited to the following: external faults; output power stage fault; instantaneous overcurrent; overtemperature (converter); loss of cooling air; motor overload; auxiliary power supply fault; supply overhnder voltage; supply phase loss; internal control system fault; regulator/power ci
43、rcuit diagnostics. 3.3 Minimum status indication required The CDM shall be equipped with a status indication signal for. “drive on“ (whether rotating or at standstill). The CDM may also be equipped with a status indication signal “drive ready for operation“. 3.4 I/O devices Number and nature of /O s
44、hall be stated by the manufacturer. Any modification shall be agreed upon between the manufacturer and user. NOTE - Inputs and outputs are needed for both variables and parameters. They are provided through analog or digital inputsloutputs using voltage or current. They are communicated through seri
45、al or parallel links according to various communications standards. Both analog and digital variables can be manually set by use of a control panel and can be read on displays. Variables and parameters are treated in the same manner. STD.BS1 BS EN bl-2-ENGL 1998 1b24bb7 073bbb3 191 W Page 22 EN 6180
46、0-2:1998 4 Service conditions 4.1 Installation and operation Unless modified, the equipment which is within the scope of this pari of IEC 61800 shall becapable of operation under the conditions listed in 2.2 and 2.3 of 1EC 60146-1-1 and IEC Guide 106. 4.1.1 Electrical service conditions Unless other
47、wise specified, the CDM or BDM shall be designed to operate under the service conditions specified below. The values specified include the effect of the drive system being considered. EMC requirements for power drive systems are stated in IEC 61800-3. NOTE - The limits specified in 4.1.1.1 to 4.1.1.
48、5 link the EMC standards to existing practice in semiconductor converters given in 2.5.1, 2.5.2, and 2.5.3 of IEC 60146-1-1, and correspond generally to class B. 4.1.1.1 Frequency variations Frequency fiN f 2 % (I 4 % for separated supply network) according to class 3 defined in IEC 61 000-2-4. Rate
49、 of change of frequency I2 % fiN /s. (See also 5.2.3.2 of IEC 61800-3.) 4.1.1.2 Voltage changes Voltage limits for uninterrupted operation PDS rated input voltage * 10 % (at the point of coupling, PC), according to class 2, defined in IEC 61000-2-4 (see also 5.2.2.1 and 5.2.2.2 of IEC 61800-3). NOTE - Short time voltage variation beyond the levels specified, may result in interruption of operation or tripping. If continuous operation is necessary, an agreement is required between the user and the supplier/manufacturer. Voltage limits for rated pe
