{"id":434073,"date":"2024-10-20T07:42:10","date_gmt":"2024-10-20T07:42:10","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-iec-61400-21-22023\/"},"modified":"2024-10-26T14:37:12","modified_gmt":"2024-10-26T14:37:12","slug":"bs-en-iec-61400-21-22023","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-iec-61400-21-22023\/","title":{"rendered":"BS EN IEC 61400-21-2:2023"},"content":{"rendered":"

IEC 61400-21-2 – Wind energy generation systems – Measurement and assessment of electrical characteristics – Wind power plants – has the following scope: IEC 61400-21-2 defines and specifies the quantities that shall be determined to characterize the electrical characteristics of grid-connected power plants (PP). IEC 61400-21-2 defines the measurement and test procedures for quantifying the electrical characteristics as basis for the verification of compliance of PP, including: – Power quality aspects – Steady state operation – Dynamic response (undervoltage and overvoltage fault ride-through) – Disconnection from grid (Grid protection) – Control performance IEC 61400-21-2 defines a uniform functionality test and measurement procedure for the power plant controller (PPC), as a basis for the unit test of the power plant controller. IEC 61400-21-2 defines the procedures for assessing compliance with electrical connection requirements, including the aggregation methods for power quality aspects such as voltage variations, flicker, harmonics and interharmonics. IEC 61400-21-2 defines the procedures for measurement and fault recording for the verification of power plant electrical simulation models in relation to undervoltage and overvoltage ride through events. These measurement procedures are valid for power plants, including the power plant controller and other connected equipment, necessary for the operation of the Power Plant. The measurement procedures are valid for any size of power plant connected to the point of connection (POC) at one connection point. The procedures for assessing and verifying the compliance with grid connection requirements are valid for power plants in power systems with fixed frequency and a sufficient short-circuit power. Out of the scope of this standard are: – Multi park control, i.e. cluster management of several power plants (PP) or several connection points – Compliance test and performance requirements, including pass or fail criteria – Specific component test and validation of the PP equipment (switchgear, cables, transformers, etc.), which are covered by other IEC standards – Wind power plant model validation, as defined in the IEC 61400-27-2 – Load flow calculation methods and load flow study guidelines – Test and measurement of the communication interface and system of the PP as defined in the IEC 61400-25 series NOTE For the purposes of this document, the following terms for system voltage apply, based on IEC 60038 Low voltage (LV) refers to 100 V < Un \u2264 1 kV; Medium voltage (MV) refers 106 to 1 kV < Un \u2264 35 kV; High voltage (HV) refers to 35 kV < Un \u2264 230 kV; Extra high voltage (EHV) refers to Un > 230 kV<\/p>\n

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2<\/td>\nundefined <\/td>\n<\/tr>\n
5<\/td>\nAnnex ZA (normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n
7<\/td>\nEnglish
CONTENTS <\/td>\n<\/tr>\n
14<\/td>\nFOREWORD <\/td>\n<\/tr>\n
16<\/td>\nINTRODUCTION <\/td>\n<\/tr>\n
18<\/td>\n1 Scope <\/td>\n<\/tr>\n
19<\/td>\n2 Normative references <\/td>\n<\/tr>\n
20<\/td>\n3 Terms and definitions <\/td>\n<\/tr>\n
24<\/td>\nFigures
Figure 1 \u2013 Example of step response <\/td>\n<\/tr>\n
30<\/td>\n4 Symbols and abbreviated terms
4.1 Symbols <\/td>\n<\/tr>\n
32<\/td>\n4.2 Abbreviated terms
5 Power plant specifications <\/td>\n<\/tr>\n
34<\/td>\n6 Overall test and documentation requirements
6.1 General
Figure 2 \u2013 Example of a PP setup <\/td>\n<\/tr>\n
35<\/td>\nTables
Table 1 \u2013 Overview of measurements and their requirements <\/td>\n<\/tr>\n
36<\/td>\n6.2 Test conditions, monitoring and reporting requirements <\/td>\n<\/tr>\n
38<\/td>\n6.3 Test conditions in the case of external influences
6.4 Test and measurement equipment
6.4.1 General
6.4.2 Voltage, current and power calculations
6.4.3 Measurement equipment <\/td>\n<\/tr>\n
39<\/td>\n6.4.4 Existing measurement equipment for power control tests
6.4.5 Optional measurements
6.5 Functional and performance test <\/td>\n<\/tr>\n
40<\/td>\n6.6 Power plant controller
6.6.1 General
6.6.2 Definition and requirements
Figure 3 \u2013 General structure of a PPC for reactive power control within a power plant <\/td>\n<\/tr>\n
41<\/td>\n6.6.3 Measurement points
Figure 4 \u2013 General structure of a PPC for active power control within a power plant
Figure 5 \u2013 Illustration of the PPC as a black box with in- and outputs <\/td>\n<\/tr>\n
42<\/td>\n6.6.4 Measurement data
6.6.5 Test setup
Figure 6 \u2013 Illustration of the PPC with the internal system data <\/td>\n<\/tr>\n
43<\/td>\n6.6.6 Documentation
Figure 7 \u2013 Illustration of a complete test setup
Table 2 \u2013 Description and general requirements of the HIL test functional <\/td>\n<\/tr>\n
44<\/td>\n7 Measurement and test of electrical characteristics
7.1 General
7.2 Power quality aspects
7.2.1 General
7.2.2 Flicker during continuous operation <\/td>\n<\/tr>\n
45<\/td>\n7.2.3 Rapid voltage changes due to switching operations <\/td>\n<\/tr>\n
46<\/td>\n7.2.4 Harmonics <\/td>\n<\/tr>\n
48<\/td>\n7.3 Steady state operation
7.3.1 General
7.3.2 Unbalance <\/td>\n<\/tr>\n
49<\/td>\n7.4 Dynamic performance
7.4.1 Undervoltage and overvoltage ride-through (UVRT and OVRT) capability
7.4.2 Test setup and test conditions
7.4.3 Test and measurement procedure <\/td>\n<\/tr>\n
50<\/td>\nTable 3 \u2013 List of recorded signals
Table 4 \u2013 List of electrical signals to be monitored for the evaluation of events <\/td>\n<\/tr>\n
51<\/td>\n7.4.4 Documentation <\/td>\n<\/tr>\n
52<\/td>\n7.5 Disconnection from grid
7.5.1 Grid protection
Figure 8 \u2013 Example of time series for the active and reactive current measured (M) and simulated (S) active and reactive current [1] <\/td>\n<\/tr>\n
53<\/td>\n7.5.2 Requirements of test devices
7.5.3 Grid protection test \u2013 PP level
Table 5 \u2013 Maximum measurement uncertainties for the grid simulator <\/td>\n<\/tr>\n
54<\/td>\n7.5.4 Grid protection test \u2013 PGU level
7.5.5 RoCoF
8 Control performance
8.1 General
8.2 Performance test
8.2.1 General <\/td>\n<\/tr>\n
55<\/td>\n8.2.2 Active power control tests
Table 6 \u2013 List of signals during test <\/td>\n<\/tr>\n
56<\/td>\nFigure 9 \u2013 Adjustment of active power reference value
Figure 10 \u2013 Example of active power response step <\/td>\n<\/tr>\n
57<\/td>\n8.2.3 Controlled shutdown
Table 7 \u2013 Accuracy of the active power control values
Table 8 \u2013 Results from the active power dynamic response test <\/td>\n<\/tr>\n
58<\/td>\nTable 9 \u2013 Example of list of signals during test <\/td>\n<\/tr>\n
59<\/td>\n8.2.4 Synthetic inertia response
Figure 11 \u2013 Example of controlled shutdown
Table 10 \u2013 Results of the emergency shutdown test <\/td>\n<\/tr>\n
60<\/td>\nTable 11 \u2013 List of signals during test <\/td>\n<\/tr>\n
61<\/td>\nFigure 12 \u2013 Synthetic inertia \u2013 example response and definitions <\/td>\n<\/tr>\n
62<\/td>\n8.2.5 Reactive power control
Table 12 \u2013 Synthetic inertia settings
Table 13 \u2013 Synthetic inertia test results <\/td>\n<\/tr>\n
63<\/td>\nTable 14 \u2013 List of signals during test <\/td>\n<\/tr>\n
64<\/td>\nFigure 13 \u2013 Test for static error
Figure 14 \u2013 Example of test of dynamic response <\/td>\n<\/tr>\n
65<\/td>\n8.2.6 Reactive power capability
Table 15 \u2013 Test for static error
Table 16 \u2013 Test for dynamic response <\/td>\n<\/tr>\n
66<\/td>\nTable 17 \u2013 List of signals during test <\/td>\n<\/tr>\n
67<\/td>\nFigure 15 \u2013 Example of test of reactive power capability QP-chart
Figure 16 \u2013 Example of reactive power capability UP-chartcorresponding to the QP-chart <\/td>\n<\/tr>\n
68<\/td>\n8.3 Functionality tests
8.3.1 General
8.3.2 Active power ramp rate limitation test
Table 18 \u2013 Example of reactive power capability QP-chart
Table 19 \u2013 List of signals during test <\/td>\n<\/tr>\n
69<\/td>\nFigure 17 \u2013 Example of available active power and activepower in ramp rate limitation mode <\/td>\n<\/tr>\n
70<\/td>\n8.3.3 Priority of setpoints
Table 20 \u2013 Active power ramp rate calculation <\/td>\n<\/tr>\n
71<\/td>\nFigure 18 \u2013 Example of active power setpoint prioritization test
Table 21 \u2013 List of signals during test <\/td>\n<\/tr>\n
72<\/td>\n8.3.4 Frequency control
Table 22 \u2013 Test results priority of setpoints <\/td>\n<\/tr>\n
73<\/td>\nTable 23 \u2013 List of signals during test <\/td>\n<\/tr>\n
74<\/td>\nFigure 19 \u2013 PPC measured frequency feedback is replaced by a simulated frequency <\/td>\n<\/tr>\n
75<\/td>\nFigure 20 \u2013 Example of an active power control function P = f(f), with the different measurement points and related steps of frequency <\/td>\n<\/tr>\n
77<\/td>\n8.3.5 Reactive power ramp rate limitation
Table 24 \u2013 Example of test sequence for the frequency dependent active power function <\/td>\n<\/tr>\n
78<\/td>\nTable 25 \u2013 List of signals during test <\/td>\n<\/tr>\n
79<\/td>\nTable 26 \u2013 Test procedure reactive power ramp rate limitation test <\/td>\n<\/tr>\n
80<\/td>\nFigure 21 \u2013 Example of reactive power ramp rate limitation test
Table 27 \u2013 Reactive power ramp rate calculation <\/td>\n<\/tr>\n
81<\/td>\n8.3.6 Voltage control Q(U)-characteristic
Figure 22 \u2013 Example of the Q(U) characteristic with a 4 % slope <\/td>\n<\/tr>\n
82<\/td>\nTable 28 \u2013 List of signals during test <\/td>\n<\/tr>\n
83<\/td>\n8.3.7 Power factor control
Table 29 \u2013 Voltage control Q(U) \u2013 slope test <\/td>\n<\/tr>\n
84<\/td>\nTable 30 \u2013 List of signals during test <\/td>\n<\/tr>\n
85<\/td>\nTable 31 \u2013 Example of power factor control test <\/td>\n<\/tr>\n
86<\/td>\n8.3.8 Communication error\/fallback scenarios
Figure 23 \u2013 Example of possible PP communication faults <\/td>\n<\/tr>\n
87<\/td>\nTable 32 \u2013 List of signals during test <\/td>\n<\/tr>\n
88<\/td>\nFigure 24 \u2013 Example of graph for communication error test
Table 33 \u2013 Example of communication error test \u2013 Failure on external interface
Table 34 \u2013 Example of failure of PPC or communication between PPC and PGUs <\/td>\n<\/tr>\n
89<\/td>\n9 Assessment of power quality of power plants (PP)
9.1 General
9.2 Voltage fluctuations
9.2.1 Voltage change
Table 35 \u2013 Example of failure of grid data measurement <\/td>\n<\/tr>\n
90<\/td>\n9.2.2 Flicker in continuous operation <\/td>\n<\/tr>\n
91<\/td>\n9.2.3 Voltage change and flicker during switching operations <\/td>\n<\/tr>\n
92<\/td>\n9.3 Current harmonics, interharmonics and higher frequency components <\/td>\n<\/tr>\n
93<\/td>\nTable 36 \u2013 Specification of exponents according to IEC TR 61000-3-6 <\/td>\n<\/tr>\n
94<\/td>\nAnnex A (informative)Report template
A.1 Overview
A.2 Power plant specification and test conditions
Table A.1 \u2013 General and nominal data <\/td>\n<\/tr>\n
95<\/td>\nA.3 Power plant controller
Table A.2 \u2013 General power plant capabilities and control functions
Table A.3 \u2013 General test and report information
Table A.4 \u2013 General test conditions and grid data <\/td>\n<\/tr>\n
96<\/td>\nA.4 Power quality aspects
Figure A.1 \u2013 Figure 25 \u2013 Voltage flicker Pst versus active power for normal operation
Table A.5 \u2013 General test conditions and test setup
Table A.6 \u2013 Flicker values <\/td>\n<\/tr>\n
97<\/td>\nFigure A.2 \u2013 Voltage flicker Pst for background level
Figure A.3 \u2013 Time series of three-phase voltages as RMS of PP starting
Figure A.4 \u2013 Time series of three-phase currents as RMS of PP starting
Figure A.5 \u2013 Time series of active and reactive power of PP starting
Table A.7 \u2013 Rapid voltage changes due to switching operations <\/td>\n<\/tr>\n
98<\/td>\nFigure A.6 \u2013 Time series of three-phase voltages as RMS of PP stopping
Figure A.7 \u2013 Time series of three-phase currents as RMS of PP stopping
Figure A.8 \u2013 Time series of active and reactive power of PP stopping
Table A.8 \u2013 General test information <\/td>\n<\/tr>\n
99<\/td>\nTable A.9 \u2013 99th percentile of 10 min harmonic magnitudes per week <\/td>\n<\/tr>\n
100<\/td>\nTable A.10 \u2013 99th percentile of 10 min harmonic magnitudes per week <\/td>\n<\/tr>\n
102<\/td>\nTable A.11 \u2013 99th percentile of 10 min harmonic magnitudes per week <\/td>\n<\/tr>\n
103<\/td>\nTable A.12 \u2013 95th percentile of 10 min harmonic magnitudes per week <\/td>\n<\/tr>\n
104<\/td>\nTable A.13 \u2013 95th percentile of 10 min harmonic magnitudes per week <\/td>\n<\/tr>\n
106<\/td>\nTable A.14 \u2013 95th percentile of 10 min harmonic magnitudes per week <\/td>\n<\/tr>\n
107<\/td>\nTable A.15 \u2013 99th percentile of 10 min harmonic magnitudes per week <\/td>\n<\/tr>\n
108<\/td>\nTable A.16 \u2013 99th percentile of 10 min harmonic magnitudes per week <\/td>\n<\/tr>\n
110<\/td>\nTable A.17 \u2013 99th percentile of 10 min harmonic magnitudes per week <\/td>\n<\/tr>\n
111<\/td>\nTable A.18 \u2013 95th percentile of 10 min harmonic magnitudes per week <\/td>\n<\/tr>\n
112<\/td>\nTable A.19 \u2013 95th percentile of 10 min harmonic magnitudes per week <\/td>\n<\/tr>\n
113<\/td>\nTable A.20 \u2013 95th percentile of 10 min harmonic magnitudes per week <\/td>\n<\/tr>\n
114<\/td>\nTable A.21 \u2013 99th percentile of 3 s harmonic magnitudes per week <\/td>\n<\/tr>\n
116<\/td>\nTable A.22 \u2013 99th percentile of 3 s harmonic magnitudes per week <\/td>\n<\/tr>\n
117<\/td>\nTable A.23 \u2013 99th percentile of 3 s harmonic magnitudes per week <\/td>\n<\/tr>\n
118<\/td>\nTable A.24 \u2013 99th percentile of 3 s harmonic magnitudes per week <\/td>\n<\/tr>\n
119<\/td>\nTable A.25 \u2013 99th percentile of 3 s harmonic magnitudes per week <\/td>\n<\/tr>\n
121<\/td>\nTable A.26 \u2013 99th percentile of 3 s harmonic magnitudes per week <\/td>\n<\/tr>\n
122<\/td>\nFigure A.9 \u2013 Maximum of the 99th percentiles of integerharmonic currents versus harmonic order
Figure A.10 \u2013 Maximum of the 99th percentiles ofinterharmonic currents versus frequency
Figure A.11 \u2013 Maximum of the 99th percentiles of higherfrequency current components versus frequency
Figure A.12 \u2013 Maximum of the 95th percentiles of integerharmonic currents versus harmonic order <\/td>\n<\/tr>\n
123<\/td>\nFigure A.13 \u2013 Maximum of the 95th percentiles ofinterharmonic currents versus frequency
Figure A.14 \u2013 Maximum of the 95th percentiles of higherfrequency current components versus frequency
Figure A.15 \u2013 Maximum of the 99th percentiles of integerharmonic voltages versus harmonic order
Figure A.16 \u2013 Maximum of the 99th percentiles ofinterharmonic voltages versus frequency <\/td>\n<\/tr>\n
124<\/td>\nFigure A.17 \u2013 Maximum of the 99th percentiles of higherfrequency voltage components versus frequency
Figure A.18 \u2013 Maximum of the 95th percentiles of integerharmonic voltages versus harmonic order
Figure A.19 \u2013 Maximum of the 95th percentiles ofinterharmonic voltages versus frequency
Figure A.20 \u2013 Maximum of the 95th percentiles of higherfrequency voltage components versus frequency <\/td>\n<\/tr>\n
125<\/td>\nA.5 Steady state operation
Figure A.21 \u2013 Current unbalance factor as a function of active power
Figure A.22 \u2013 Voltage unbalance factor as a function of active power
Table A.27 \u2013 Unbalance <\/td>\n<\/tr>\n
126<\/td>\nA.6 Dynamic performance
Figure A.23 \u2013 Time series: Instantaneous three-phase currents and voltages at the POC
Figure A.24 \u2013 Time series: Positive and negative sequence of the active and reactive current
Figure A.25 \u2013 Time series: Positive and negative sequence of the active and reactive power
Table A.28 \u2013 General fault information of undervoltage andovervoltage ride-through (UVRT and OVRT) events\/recorda <\/td>\n<\/tr>\n
127<\/td>\nA.7 Disconnection from grid (grid protection)
A.8 Performance test
A.8.1 General
A.8.2 Static error test
Figure A.26 \u2013 Time series: Positive and negative sequence grid voltage at the POC
Figure A.27 \u2013 Time series of available active power, measured active power output and reference values
Table A.29 \u2013 Accuracy of the active power control values <\/td>\n<\/tr>\n
128<\/td>\nA.8.3 Dynamic response test
A.8.4 Controlled shutdown
Figure A.28 \u2013 Time series of available active power, measured active power output and reference values
Figure A.29 \u2013 Time series of available active power, measured active power output and reference values
Table A.30 \u2013 Accuracy of the active power control values
Table A.31 \u2013 Results of the emergency shutdown test <\/td>\n<\/tr>\n
129<\/td>\nA.8.5 Synthetic inertia response
Figure A.30 \u2013 Time-series of available active power, measured active power and reference value of the grid frequency for (test 1 and test 2) 0,25 \u00d7 Pn < P < 0,5 \u00d7 Pn
Figure A.31 \u2013 Time-series of available active power, measured active power and reference value of the grid frequency for (test 3 and test 4) P > 0,8 \u00d7 Pn
Figure A.32 \u2013 Time-series of available active power, measured active power and reference value of the grid frequency for (test 5 and test 6) v > vn <\/td>\n<\/tr>\n
130<\/td>\nTable A.32 \u2013 Synthetic inertia test results <\/td>\n<\/tr>\n
131<\/td>\nA.8.6 Reactive power control
Figure A.33 \u2013 Time-series of reactive power reference values and measured reactive power and grid voltage during the test of reactive power control
Figure A.34 \u2013 Time-series of reactive power reference values and measured reactive power, grid voltage during the test of reactive power control
Table A.33 \u2013 Test for static error <\/td>\n<\/tr>\n
132<\/td>\nA.8.7 Reactive power capability
Figure A.35 \u2013 Zoom of step response (for all three-step responses) in the time-series of reactive power reference values and measured reactive power, grid voltage during the test of reactive power control
Figure A.36 \u2013 Test of reactive power capability QP-chart
Table A.34 \u2013 Test for dynamic response <\/td>\n<\/tr>\n
133<\/td>\nA.9 Functionality tests
A.9.1 Active power ramp rate limitation test
Figure A.37 \u2013 Reactive power capability UP-chart corresponding to the QP-chart
Figure A.38 \u2013 Time-series of available active power and active power in ramp rate limitation mode \u2013 Slow ramp rate
Table A.35 \u2013 PQ-diagram <\/td>\n<\/tr>\n
134<\/td>\nA.9.2 Priority of setpoints
Figure A.39 \u2013 Time-series of available active power and active power in ramp rate limitation mode \u2013 Fast ramp rate
Figure A.40 \u2013 Time-series of active power setpoints, available power and active power
Table A.36 \u2013 Active power ramp rate calculation \u2013 Slow ramp rate
Table A.37 \u2013 Active power ramp rate calculation \u2013 Fast ramp rate <\/td>\n<\/tr>\n
135<\/td>\nA.9.3 Frequency control
Figure A.41 \u2013 Time-series of active power setpoints, available power and active power
Figure A.42 \u2013 Time-series of simulated frequency
Table A.38 \u2013 Test results priority of setpoints <\/td>\n<\/tr>\n
136<\/td>\nA.9.4 Reactive power ramp rate limitation
Figure A.43 \u2013 Time series of reactive power setpoint, reactive power
Table A.39 \u2013 Frequency dependent active power function results <\/td>\n<\/tr>\n
137<\/td>\nA.9.5 Voltage control Q(U)-characteristic
Figure A.44 \u2013 Time series of voltage \u2013 Reactive power, expectedreactive power for a given slope
Table A.40 \u2013 Reactive power ramp rate calculation <\/td>\n<\/tr>\n
138<\/td>\nA.9.6 Power factor control
Figure A.45 \u2013 Time series of active power, reactive power,power factor and power factor reference
Table A.41 \u2013 Voltage control Q(U) \u2013 slope test <\/td>\n<\/tr>\n
139<\/td>\nTable A.42 \u2013 Power factor control test <\/td>\n<\/tr>\n
140<\/td>\nA.9.7 Communication error \/ fallback scenarios
Figure A.46 \u2013 Time-series of active power setpoint, active power and available power and failure time point (case 1 to case 3)
Table A.43 \u2013 Communication error test \u2013 Failure on external interface (example)
Table A.44 \u2013 Failure of PPC or communication between PPC and PGUs (example)
Table A.45 \u2013 Failure of grid data measurement (example) <\/td>\n<\/tr>\n
141<\/td>\nFigure A.47 \u2013 Graph for communication error test (example)
Table A.46 \u2013 Communication error test \u2013 Failure on external interface (example)
Table A.47 \u2013 Failure of PPC or communication between PPC and PGUs (example)
Table A.48 \u2013 Failure of grid data measurement (example) <\/td>\n<\/tr>\n
142<\/td>\nAnnex B (informative)Harmonic evaluation
B.1 Harmonic estimation at the point of interest
B.2 Background harmonic distortion <\/td>\n<\/tr>\n
143<\/td>\nB.3 Harmonic summation
B.4 Harmonic propagation studies <\/td>\n<\/tr>\n
144<\/td>\nB.5 PP harmonic contribution evaluation
B.5.1 General
B.5.2 Incremental PP harmonic contribution based on simulations
B.5.3 PP electromagnetic compatibility analysis based on simulations
Figure B.1 \u2013 Simplified representation for the PP connected to the externalgrid used for the estimation of incremental harmonic contribution at POC orany other point of interest <\/td>\n<\/tr>\n
145<\/td>\nB.5.4 Harmonic measurements at the POC
Figure B.2 \u2013 Simplified representation of the PP for harmonic propagation studies including the harmonic background and PGU\u2019s non-ideal harmonic voltage source <\/td>\n<\/tr>\n
146<\/td>\nAnnex C (informative)Validation procedure for PP
Table C.1 \u2013 Recommended assessment methods forthe validation of the electrical capabilities of the PP <\/td>\n<\/tr>\n
148<\/td>\nAnnex D (informative)Measurement accuracy
Table D.1 \u2013 Voltage transducer (VT) in MV, HV and EHV <\/td>\n<\/tr>\n
149<\/td>\nTable D.2 \u2013 Current transducer (CT) in MV, HV und EHV <\/td>\n<\/tr>\n
151<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Wind energy generation systems – Measurement and assessment of electrical characteristics. Wind power plants<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2023<\/td>\n154<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":434084,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2641],"product_tag":[],"class_list":{"0":"post-434073","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-bsi","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/434073","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/434084"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=434073"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=434073"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=434073"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}