DL/T 1961-2019 in English

VALID

Calculation method of uncertainty in flow measurement of power plant

Issued on:2019-06-04
Implemented on:2019-10-01
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Standard No:	DL/T 1961-2019
Document status:	VALID
Title in English:	Calculation method of uncertainty in flow measurement of power plant
Title in Chinese:	火电厂流量测量不确定度计算方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2019-06-04
Implemented on:	2019-10-01
Professional Classification:	DL-Electricity
Related Keywords:	uncertainty assessment method flow measurement curve uncertainty calculation uncertainty assessment uncertainty synthesis
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Introduction

Standard Overview

DL/T 1961-2019 specifies the uncertainty assessment method for flow measurement in thermal power plants during calibration and use, and is applicable to flow measurement scenarios in closed pipelines and open channels. The standard content includes term definitions, parameter symbols, linear/nonlinear fitting methods, and appendix examples.

Core calculation method

1. Principles of uncertainty assessment

The assessment is divided into two stages: basic mathematical relationship formal analysis and fitting curve uncertainty calculation:

Independent measurement: Random and systematic uncertainties are calculated according to Chapter 6
Linear fitting: When the error of the independent variable can be ignored, the least squares method is used (Formula 1: y=a+bx)
Non-linear fitting: Through polynomial transformation or segmented processing (Chapter 8)

2. Comparison of key formulas

Calculation type	Core formula	Applicable conditions
Random uncertainty	e_R(x)=ts(x) (Equation 4)	Independent measurement, t-distributed confidence interval
Systematic uncertainty	e_S=√(∑e_S,i²) (Equation 6)	Known historical calibration data
Linear fit slope	b=∑[(x_i-x̄)(y_i-ȳ)]/∑(x_i-x̄)² (Equation 16)	γ=s(y)/s(x)≥20

Implementation points

1. Calibration curve verification

Determine linearity through residual analysis (Formula 11: Δ(y_i)=y_i-a-bx_i):

Open channel flowmeter: Use logarithmic transformation linearization (Appendix B Formula 12-13)
Nozzle flowmeter: Check the Re_d-C coefficient relationship (Appendix C Figure C1)

2. Uncertainty synthesis

The total uncertainty uses the RSS model (Formula 39):

U_RSS(ŷ)=√[U_RSS²(ŷ₀)+U_RSS²(ŷ_c)]

The uncertainty introduced by calibration needs to take into account the influence of slope (Formula 34-35).

Technology Evolution Analysis

This standard localizes the linear/nonlinear calibration relationship evaluation method of ISO-TR-7066 for the first time. The main innovations are:

Add examples for specific scenarios of thermal power plants (Appendix B/C)
Clarify the orthogonal polynomial fitting process (Appendix E)
Refine the synthesis rules of systematic errors and random errors (Section 7.7.2)

Application Case

600MW unit nozzle calibration (Appendix C)

Key data:

Discharge coefficient C=0.9968±0.12%（Re=2.44×10⁶）
Main sources of system error: diameter ratio β (0.2%), differential pressure △P (0.078%)
Use iterative method to reduce the additional uncertainty introduced by the slope to 0.0012

More samples: JGJ 94-2008 DL/T 5154-2012 DL/T 368-2010

Sample only — not a preview of DL/T 1961-2019

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