1、STDDBSI BS EN b052Li-ENGL 1993 Lb2Libb9 0785401 79b W BRITISH STANDARD Direct-current resistive volt ratio boxes The European Standard EN 60524 : 1993, with the incorporation of its amendment A2 : 1997, has the status of a British Sandard ICs 17.220.20 5s EN i0524 : 1993 ncorpornting ,men - a.c. or
2、impulsive (caused by, for example, auxiliary equipment). 3. Classification VRBs specified in this standard are classified according to their acciiracy classes as defined in Sub-clause 2.23 as: a) 0.0001,0.0002,0.0005,0.001,0.002, 0.005, 0.01, 0.02,0.05, 0.1 b) 1 PPM, 2 PPM, 5 PPM, 10 PPM, 20 PPM, 50
3、 PPM, 100 PPM, 200 PPM, 500 PPM, 1 000 PPM* The class index of a VRB may be expressed either in percent using a) or in ppM using 6) or both. 4. Limits of intrinsic error VRBs shall comply with the relevant limits of intrinsic error specified for their respective accuracy classes for the duration of
4、one year from the date of certification associated with delivery or another date to be agreed upon by the manufacturer or responsible supplier and the user, provided that the conditions of use, transport and storage specified by the manufacturer are complied with. Norc. - For VRBs, stability of rati
5、o with regard to time is an essential characteristic. Here, it is specified only for the duration of one year, but experience has shown that the rate of change of ratio due to ageing effects decreases with time. 4.1 Perniissibic lnits of intrinsic error given in Table I relating to its accuracy clas
6、s. When a VRB is under the reference conditions given in Table II, the intrinsic error shall not exceed the value IEC page 1 I 4 STDiBSI BS EN bU529-ENGL 1773 E Lb29bbS 0785907 T87 BS 5765 : 1979 O.O1 0.0002 0.0005 0.001 Class index 0.002 0.005 0.01 0.02 0.05 1 0.1 Unless otherwise specificrl, all s
7、electable voltage ratios shall have the same class index. 4.3 D.C. parasitic voltages When a VRB is used at any rated voltage, the error caused by the d.c. parasitic voltage shall not exceed a value corresponding to 0.2 times the class index provided that it is operated in accordance with the manufa
8、cturers instructions. Nore. - When the nature of the test is appropriate, the effect of a d.c. parasitic voltage may be reduced by reversing the polarity of the input voltage and by taking the average of the two measured values. Reference conditions unless otherwise indicated by the manufacturer Inf
9、luence quantity Ambient temperature 20 “C 8) Relative humidity 40% to 60% 5. Condiions for the determination of intrinsic errors Class index ?h 1 PPM 0.0001,. .0.001 1.10 0.002 . 0.01 0.02 . 0.1 200 .lo00 20 .loo 5.1 The reference conditions relative to each of the influence quantities are shown in
10、Table II. 5.2 Before any measurement, sufficient time shall elapse for the VRB to reach a stable state and to be in equilibrium with the reference values of the influence quantities. TABLE II -r- - Common mode voltage 1 % of the maximum Zcro 0.m1. . .0.1 1.1OOo spcced d.c. common mo b) typc referenc
11、e given by the manufacturer or responsible supplier; O BSI 07-1 999 7 IEC page 17) STD-BSI BS EN b0524-ENGL 1993 Lb24bb7 0785qL2 571 EN60624:1993 c) serial number; d) class index (indias); e) nominal voltag ratio); f) reference value and nominal range of use for temperature if different from those g
12、iven in Tables II and III; g) rated voltagc(s) (,); h) nominal range) of usc for voltage if different from that in Table 1iJ; i) resistance in the following form: - for VRBs of tk type shown in Figure la, the nominal resistance across the output terminals divided - for VRBs of the type shown in Figu
13、re lb, the nominal resistance moss the input terminals; by the nominal output voltage (e.g. I o00 fim; - when tk VRB is not of the form given by Figure ia or Figure Ib (e.g. a VRB having a leakage cumnt circuit), all the relevant resistance values (or resistana/nominal voltage values) shall be state
14、d; I j) test deleted k) where relevant, refenncc position and nominal range of use for position; f) where relevant, essmtial parameters of thc auxiliary quipment; m) circuit diagram, values of components and list of replaceable parts; n) reference valut (range) and nominal range of ust for other inf
15、luem quantitics (secf) and k) if diffutnt from those given in Tables II and III; tj overvoltage category; 1 s) pollution degree. 8.1.2 If a certificate is supplied by agrement betwren the manufacturer or responsible supplk and the user, it shall contain tht foiiowing information: o) ccrtified voltag
16、e ratio) together with their uncertainties; p) date of certification; q) designation of certifying authority. 8.2 Markiqgs, Synrbolr ad their locations The markings and symbols shall be legible and indelible. Ihc symbols spdikd in Table V ahall k used. 8.2.1 The following information shall be marked
17、 on a nameplate or on the case: a), b), c); d) using symbols E-1 or E-6; , 4,f),g), Ir), i); k) using symbols D-t to D-6. r) using the symbol according to IEC 61010-1, amendment 2, subclause 5-15 r) pollution degree according to iEC 61010.1. In addition, tbc following markings shall bc made: “Volt r
18、atio box” or this term in another language. Where relevant. symbol F-33, showing that some other essential information is given in a separate document. I If the reference value or the reference range is marked, it shall be identified by underlining. IIFP MIC 141 a 8 BSI 07-1999 STD-BSI BS EN hO524-E
19、NGL 1993 IEl lb24bb7 0785413 408 m EN60524:1993 8.2.2 The following terminals shall be identified by marking adjacent to the terminal: - input and output terminals (using the rated voltage(s); - terminals for condon to auxiliary quipment (type of supply and rad voltage); - earth terminal, if any (us
20、ing symbol F-31); - terminal(s) of the leakage current screen (circuit), if any, - terminal of the electrostatic screen, if any. 8.2.3 The ohcr information may be given eithcr on the nameplate or on the case or in a separate: document. 8.3 Donunmrotion 8.3.1 Documentation shall state: - nctho of put
21、ting into operation; - procedures for csablirhing cornpliutce with tk performance requirements of this stan-, - ncammeaded routine maintiinanCe. if relevant. 8.3.2 Docmitation shail also state: 4, b), cl, i), k), U, m), n). 8.3.3 Tk rtibtc rrferred to in Suklausc 8.1.2, when supplied, shall state: a
22、). b). c). 0). PI. 4)- 8.4 xawpies of the markings of a VRB 8.4.1 VRB of the type shown in Figure la. vdt ritio box N. N. No. 12345 0.02 (or a10 ppM) 1900 V/lS V/iS V: 1.5 V Typ A. B. C. D. A .1.0 .1.4) &# is . Zo:.ZT la#i/V I a .no .lW CAT U PD1 - In this example, the markings provide the following
23、 information: i) Volt ratio box, type A.B.C.D., serial number 12345, manufactured by N.N. 2) ihc class index is 0.02 or 200 ppM. 3) “he nominal voltage ratios arc 1 , 100 and 10. 4) The reference values and nominal ranges of use for voltage are: when the ratio is loo0 100 10 the rated voltage (U,) i
24、s 15OOV 150 v I5 V and ihe nominal range of use is from 6OOV 6OV 6V to 21mv 210 v 21 v. O BSI 07-1 999 9 IEC page 2 1 5) Because the nominal range of use for temperature is different from that given in Table III, its values and the derence temperature have to bt marked even though the reference temp
25、erature is hc same as that gim in Table II. 6) “1 o00 n/V“ implies that the nsisanct across the output terminals is I Mo R. Similarly, the resistana across the 1 S V input terminals is I .5 MQ. 7) The position symbol (Symbol D-4) indicates that the reference position is with the supporting surface v
26、ertical, with a nominal range of use of 10“ about the vertical. 8) The overvoltage category is II. 9) The pollution degree is 1. I 8.4.2 VRB of thc typt shown in Figure 1 b. Volt ritio box Typc X. Y. 2. No. 67.89 0.1 (or 1 o00 ppM) io0Ov:Iv/2vI5v A CAT Ii PD1 In this example, the markings provide th
27、e following information: I) Volt ratio box, type X.Y .Z., serial numkr 6789, manufactured by P.Q. 2) hc dm index is 0.1 or 1 o00 ppM. 3) The nominal voltage ratios are 1 OOO, 500 and 200. 4) Bccausc the reftrcnce voltage and nominal range of use for voltage am not marked, the reqtS of Table III appl
28、y. Thus, the refmncc val= is 1 O00 V and the nominal range of use is from 1 100 V ta 100 V for all fatios. 5) As no reference temperature and nominal range of use for tcmpmture arc shown, thc requirements of Table II ad Table 111 apply, i.e. a reference temperature of 20 “C with a nominal range of u
29、se from IO C to 30 “C. 6) The resitturce across the input terminals is 1 Mn. I 7) overvoltage category is . 8) Aciditid csscntial information is given in a separate document. 9) Tbc absence of a position symbol shows that tht VRB may be used in any position. I 10) The pollution degree is 1. 10 8 BSI
30、 07-1999 STD-BSI BS EN bD52q-ENGL 1993 P9 Lb24bb9 0785q15 260 8 EN 60524 : 1993 No. TABLE V SlmboIs for murking VRBs Thc majority of these symbols have been taken from I EC Publication 5 I, Table XI. 1ian Symbol I No. A-2 A-3 A4 A-5 A4 A-7 A4 A46 A-17 A-I8 Ampem A Milliampere mA Microampere w Kilovo
31、lt kV Volt V Millivolt mV Microvolt vv Kilohertz LHz Hcrtr HZ Megohm MfA Nominal mg of UT -1 . . +1 - -1, o .+lD - D-1 D-2 VRB to k useri with the supporting surface vertical VRB to be uscd with the supporting surface horizontal Itan Symbol D-3 L VRB to be used with the supporting surlice inclined (
32、C.E. ao“) from tbc horizontal plane M Exampk for VRB to be &I)-1 Nominal range of use 80. . .loo I 8.eO.lW DS ElimpkforVBtok I D-6 Exunpk for VRB to be iiwduD-3 Nombui mng of use 4se-. -75 L A-19 I Kilobm I m A-21 I MiIliohm I mn E I I E- 1 Qur index with errors of the fiduchi nlpu arprrucd-.peroniw
33、F (c.g. 0.01) 0.01 C (Sec IE 61010-I) D PaitioBdiiu Ed chra index with erma cxprrrtcd in p p M of the fiducial value kg. 100 PPM) 1 I F GarrJw Ekctrostatic screen F-27 F-3 I Earth terminal F-33 Refer to P separate document A - F-4 I Under consideration n hkag current screen 8 BSI 07- I999 11 BS 5765
34、 : 1979 APPENDIX A DETERMINATION OF THE EFFECT OF COMMON MODE VOLTAGE (see Figure 2) The VRB shall be connected to a source of the rated input voltage applied to the input terminals for the The output terminais are connected to a d.c. potentiometer. The case of the potentiometer and the common termi
35、nals of the potentiometer and the VRB are connected to earth. The case of the VRB (and other parts of it which are normally connected to earth) are isolated from earth and connected to one pole of a source of d.c. common mode voltage. The other terminal of this source is connected to earth. highest
36、range. The leakage current screen (circuit), if any, of the VRB is connected as for normal use. The variation due to common mode voltage is given by the difference between the potentiometer dial setting with the common mode voltage source replaced by a short circuit and the potentiometer dial settin
37、g with the common mode voltage source set to the stated value for both polarities of the common mode voltage source. The variation due to the common mode voltage is the larger of the differences so obtained. Nore. - When the VRB includes auxiliary equipment, the voltage between this equipment and th
38、e enclosure of the VRB has to remain, during the test, the same as in normal operation. This may need special precautions such as an isolating transformer. IEC page 271 12 STD-BSI BS EN b0524-ENGL 1793 PI Lb24bb9 0795437 053 m EN 60524 : 1993 W U 6 W p FIG. 2. - Test circuit for the detmnination of
39、the effect of common mode voltage. O BSI 07-1999 13 BS EN 60524 : 1993 BSI 389 chiswic, High Road London w4 4AL STD-BSI BS EN bOSZY-ENGL 1993 I 1bZYbb 0785Y18 TT P BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK
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