IEC 61869-11:2017 pdf download

IEC 61869-11:2017 pdf download.Instrument transformers – Part 11: Additional requirements for low-power passive voltage transformers
1 Scope
This part of IEC 61 869 is a product standard and covers only additional requirements for low- power passive voltage transformers (passive LPVT). The product standard for low-power passive voltage transformers is composed of IEC 61 869-1 , along with IEC 61 869-6 and this document with specific requirements. This document is applicable to newly manufactured low-power passive voltage transformers with analogue output having rated frequencies from 1 5 Hz to 1 00 Hz for use with electrical measuring instruments or electrical protective devices. This document covers low-power passive voltage transformers used for measurement or protection and low-power passive voltage transformers used for both measurement and protection. Low-power passive voltage transformers have analogue output only (for digital output or for technology using any kind of active electronic components refer to future IEC 61 869-7 2 ). Such low-power passive voltage transformers can include the secondary signal cable (transmitting cable). The secondary voltage of the low-power passive voltage transformer is proportional to the primary voltage. Derivative output signals are not within the scope of this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. Clause 2 of IEC 61 869-6:201 6 is applicable with the following additions: IEC 61 869-6:201 6, Instrument transformers – Part 6: Additional general requirements for low- power instrument transformers
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61 869-1 and IEC 61 869-6 apply with the following additions and modifications:3.1 .1 1 01 voltage divider device comprising resistors, inductors, capacitors (or a combination of these components) such that, between two points of the device, a desired fraction of the voltage applied to the device as whole can be obtained [SOURCE: IEC 60050-31 2:2001 , 31 2-02-32, modified – transformer deleted] 3.1 .1 1 02 high-voltage resistor R 1 resistor connected between the high-voltage terminal and the intermediate-voltage secondary terminal of a voltage divider 3.1 .1 1 03 high- voltage capacitor C 1 capacitor connected between the high-voltage terminal and the intermediate-voltage secondary terminal of a voltage divider [SOURCE: IEC 60050-436:1 990, 436-02-1 2] 3.1 .1 1 04 low- voltage resistor R 2 resistive part of an R- or RC-divider between the secondary terminals 3.1 .1 1 05 low-voltage capacitor C 2 capacitive part of a C- or RC-divider between the secondary terminals 3.1 .1 1 06 voltage limitation device device connected in parallel to the secondary terminals to limit overvoltage
5 Ratings
5.3 Rated insulation levels and voltages 5.3.5 Insulation requirements for secondary terminals Subclause 5.3.5 of IEC 61 869-6:201 6 is applicable with the following addition: For rated secondary voltage > 1 0 V the test voltage is 3 kV regardless of the cable length. 5.3.601 Rated auxiliary power supply voltage (U ar ) Not applicable. 5.5 Rated output 5.5.601 Rated burden (R br ) Subclause 5.5.601 of IEC 61 869-6:201 6 is applicable with the following addition: The cable included in the LPVT shall not be changed/modified in order to preserve the specified characteristics of the device. 5.5.602 Standard values for rated delay time (t dr ) Not applicable. 5.6 Rated accuracy class 5.6.1 1 01 Accuracy based on the rated transformation ratio and rated phase offset Ratio error ε is calculated according to the formula in Note 1 1 01 of definition 3.4.3. No correction for individual characteristics of the passive LPVT is done. 5.6.1 1 02 Accuracy based on individual corrected transformation ratio and corrected phase offset As alternative to the accuracy based on the rated transformation ratio and rated phase offset, for passive LPVT the compliance to the accuracy class can be based on the individual corrected transformation ratio or individual ratio correction factor and the individual corrected phase offset or individual phase offset correction. Corrected ratio error ε cor U is calculated according to the formula in Note 1 of definition 3.4.1 1 05. The correction factor CF U shall be in the range of 0,900 to 1 ,1 00 and specified with the suitable accuracy and number of decimals according to the relevant accuracy class (with a minimal resolution of 0,001 ).