CN103091659A - Electric energy meter dynamic measurement cycle power sequence proportional allocation calibration method - Google Patents

Abstract

The electric energy meter dynamic measurement cycle power sequence proportional allocation calibration method belongs to the technical field of electric energy meter dynamic performance measurement. The electric energy meter dynamic measurement cycle power sequence proportional allocation calibration method solves the problem that a power signal source is adopted to produce dynamic load electric energy signals, and therefore measurement tracing error can not be given out in the existing dynamic performance measurement test of an electric energy meter. The electric energy meter dynamic measurement cycle power sequence proportional allocation calibration method adopts synchronous on-off keying (OOK) cycle on-off control signals generated from three-phase steady-state voltages or three-phase steady-state current signals to dynamically distribute the three-phase steady-state current signals, by using a power electronic component, such as controllable silicon, transient state, short time and long time three kinds of periodically-changed dynamic load current signals are controlled to be produced, and dynamic load power is input into the electric energy meter under test in a discrete electric energy sequence mode. Dynamic load measurement validation error of the electric energy meter under the test is calculated by collecting output impulse of a standard electric energy meter and the electric energy meter under the test, and dynamic load measurement test tracing of the electric energy meter under the test can be achieved. The electric energy meter dynamic measurement cycle power sequence proportional allocation calibration method is suitable for validation of electric energy meters.

Description

Calibration Method of Proportional Distribution of Electric Energy Sequence in Dynamic Measuring Period of Electric Energy Meter

technical field

The invention relates to a method for verifying the proportional distribution of electric energy series in a dynamic measurement period of an electric energy meter, and belongs to the technical field of dynamic performance measurement of electric energy meters.

Background technique

In recent years, with the development of industrial technology, the dynamic power load in the power system has been increasing, such as: high-power silicon rectifier equipment used in electrified railways, AC electric arc furnaces and AC inverter devices used in iron and steel enterprises, petrochemical High-power electric drive equipment and motor frequency conversion speed control devices, construction tower cranes and welding equipment used in industries such as machinery and machinery. These dynamic loads are mainly manifested as: the instantaneous load current is severe, the fluctuation is large-scale up and down, and the sub-harmonic wave changes with time, etc., which cause the electric energy meter to produce a large electric energy measurement error, which has caused extreme damage to both the power supply and the electricity consumer. large economic loss. Therefore, it has become a new problem to be solved urgently to realize the metering performance test of the electric energy meter widely used at present under the dynamic load.

At present, electric energy meters of various principles are designed, manufactured, tested and inspected for steady-state load conditions, and tests of electric energy meters under dynamic load conditions are not included. For dynamic load conditions, the dynamic measurement characteristics of electric energy meters produced by different manufacturers have not been fully tested and studied. In the current research on the dynamic characteristics of electric energy meters, the dynamic load electric energy signals used in the dynamic measurement performance test of electric energy meters are all directly generated by power signal sources. This method of generating dynamic load electric energy signals lacks the dynamic measurement performance of electric energy meters. The traceability of the test cannot give the measurement traceability error.

Contents of the invention

The present invention aims to solve the problem that the power signal source is used to generate the dynamic load electric energy signal in the existing dynamic performance measurement test of the electric energy meter, and the measurement traceability error cannot be given. test method.

The electric energy meter dynamic metering cycle electric energy sequence proportional distribution verification method of the present invention uses a three-phase steady-state voltage signal or a three-phase steady-state current signal to generate a synchronous on-off control signal OOK through a cycle distribution circuit, and the on-off control signal OOK The dynamic load current signal is generated by a three-phase dynamic load current signal generating circuit, and the dynamic load current signal is input to the measured electric energy meter in the form of a discrete electric energy sequence; the three-phase dynamic load current signal generating circuit adopts a three-phase steady-state current signal As a working power supply; the measured electric energy meter uses a three-phase steady-state voltage signal as a working power supply;

Then collect the pulse signal output by the measured electric energy meter, and collect the pulse signal output by the standard electric energy meter at the same time. The standard electric energy meter works under the three-phase steady-state voltage signal and the three-phase steady-state current signal. The measurement verification error calculation circuit calculates the pulse signal output by the measured electric energy meter and the pulse signal output by the standard electric energy meter, and obtains the dynamic load measurement verification error of the electric energy meter under test, and realizes the dynamic load measurement test of the electric energy meter under test Traceability.

The synchronous on-off control signal OOK s(t) is:

$\mathrm{<span\; class="notranslate">\; the\; s</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; n</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ,</span>$

In the formula, a _n is the discrete electric energy sequence of the dynamic load current signal, n is the sequence number of the discrete electric energy sequence, and the expression of a _n is:

t is time, T is 50Hz power frequency AC cycle,

rectangular window function

N is a natural number;

The time-domain instantaneous current i _dn (t) of the OOK dynamic load in the nth control cycle under the synchronous on-off control signal OOK control mode is:

In the formula, I _rms is the effective value of the current in the OOK dynamic load time domain, ω is the current angular frequency in the OOK dynamic load time domain, φ _n is the instantaneous current in the OOK dynamic load time domain in the nth control cycle i _dn (t) base initial angle of the wave component or harmonic component, A is the magnitude of the harmonic component of the instantaneous current i _dn (t) in the OOK dynamic load time domain, m ₁ and m ₂ are both positive integers, The ratio of is the integer or fractional harmonic of the instantaneous current i _dn (t) in the OOK dynamic load time domain;

m₁，m₂∈N^*，N^*为正自然数的集合，A∈Q^*，Q^*为正有理数集合，且nT≤t≤(n+1)T，当为整数时，i_dn(t)中含有整数次谐波电流分量；当为分数时，i_dn(t)中含有非整数次谐波电流分量；ω=2πf,

m ₁ , m ₂ ∈ ^{N *} , N ^* is a set of positive natural numbers, A ∈ Q ^* , Q ^* is a set of positive rational numbers, and nT≤t≤(n+1)T, when When is an integer, i _dn (t) contains integer harmonic current components; when When is a fraction, i _dn (t) contains non-integer harmonic current components;

The dynamic load current signal is input to the electric energy meter under test in the form of discrete electric energy sequence {E _di0 (n), E _di1 (n), E _di2 (n), ..., E _din (n)}, and E _din (n) is The dynamic load electric energy in the nth control cycle of the synchronous on-off control signal OOK, E _din (n) is expressed in the form of electric energy equivalent as:

In the formula, U _rms is the voltage effective value in the OOK dynamic load time domain, and E _q is the quantified electric energy equivalent, which is the quantified electric energy equivalent under a certain verification input condition;

Use T _A to represent the number of entire cycles of the 50Hz sinusoidal current signal included in the conduction period of a synchronous on-off control signal OOK, and use T _R to represent the number of cycles included in the turn-off period of a synchronous on-off control signal OOK The number of whole cycles of the 50Hz sinusoidal current signal,

When the dynamic load current signal input to the electric energy meter under test is the synchronous on-off control signal OOK under the conditions of T _A and T _B , the number N _A of the pulse signal output by the electric energy meter under test is collected, and the calculated value is the same as that of the electric energy meter under test. The number of output pulse signals N _A corresponds to the calculated number of pulses m ₀ of the standard electric energy meter:

${\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 3600</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 1000</span>}}{\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; I</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; u</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; J</span>}}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; *</span>\frac{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}}<span\; class="notranslate">\; ,</span>$

In the formula, C is the output pulse constant of the measured electric energy meter, and the unit is P/kWh; K _I is the transformation ratio of the current transformer externally connected to the standard electric energy meter during the calibration process; K _U is the voltage mutual inductance externally connected to the standard electric energy meter during the calibration process Transformer ratio; K _J is the wiring coefficient, C ₀ is the output pulse constant of the standard electric energy meter, and the unit is P/WS;

According to the standard pulse number m output by the measured electric energy meter under the condition of dynamic load electric energy, the dynamic load measurement calibration error γ of the measured electric energy meter is obtained as:

$\mathrm{<span\; class="notranslate">\; \&gamma;</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m</span>}}{\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 100</span>}<span\; class="notranslate">\; \%</span><span\; class="notranslate">\; ;</span>$

The synchronous on-off control signal OOK input to the measured electric energy meter is in the all-through control mode, and the three-phase steady-state voltage signal and the three-phase steady-state current signal are input to the electric energy meter under test, and the pulse signal output by the electric energy meter under test is collected The number N _S is calculated to obtain the calculated pulse number m _S0 of the standard electric energy meter corresponding to the number N _S of pulse signals output by the measured electric energy meter:

${\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 3600</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 1000</span>}}{\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; I</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; u</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; J</span>}}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; ,</span>$

According to the standard pulse number m _S corresponding to the given measured steady-state electric energy of the measured electric energy meter, trace the source of the dynamic load measurement test of the measured electric energy meter, and its traceability error γ _S is:

${\mathrm{<span\; class="notranslate">\; \&gamma;</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}}{{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 100</span>}<span\; class="notranslate">\; \%</span><span\; class="notranslate">\; .</span>$

The invention has the advantages that the invention can effectively reflect the dynamic load measurement performance of the electric energy meter and trace the source of the dynamic load measurement performance test of the electric energy meter. It adopts the synchronous OOK periodic on-off control signal generated by the three-phase steady-state voltage or three-phase steady-state current signal to dynamically distribute the three-phase steady-state current signal, and uses power electronic devices such as silicon controlled rectifiers to realize control to generate transient, short-term There are three kinds of dynamic load current signals that change periodically, namely long-term and long-term. The dynamic load electric energy is input to the measured electric energy meter in the form of discrete electric energy sequence, and the measured electric energy is calculated by collecting the output pulses of the standard electric energy meter and the electric energy meter under test. The dynamic load measurement calibration error of the meter can be realized, and the traceability of the dynamic load measurement test of the measured electric energy can be realized.

The invention establishes a calculation method for the dynamic load measurement verification error of the electric energy meter, which can transition the static error of the standard electric energy meter to the dynamic error of the measured electric energy meter, and compare the theoretical value of the dynamic load electric energy distributed to the measured electric energy meter, The dynamic load measurement error of the measured electric energy meter is calculated by calculating the dynamic load electric energy value actually measured by the electric energy meter under test.

Description of drawings

Fig. 1 is a functional block diagram of the electric energy meter dynamic metering cycle electric energy sequence proportional distribution verification method of the present invention.

Detailed ways

Specific embodiment 1: The present embodiment is described below in conjunction with Fig. 1. The electric energy meter dynamic metering cycle electric energy sequence proportional distribution verification method described in the present embodiment adopts three-phase steady-state voltage signals or three-phase steady-state current signals through periodic distribution The circuit 1 generates a synchronous on-off control signal OOK, and the on-off control signal OOK generates a dynamic load current signal through the three-phase dynamic load current signal generating circuit 2, and the dynamic load current signal is input to the measured electric energy meter in the form of a discrete electric energy sequence; The three-phase dynamic load current signal generating circuit 2 adopts a three-phase steady-state current signal as a working power supply; the measured electric energy meter adopts a three-phase steady-state voltage signal as a working power supply;

Then collect the pulse signal output by the measured electric energy meter, and collect the pulse signal output by the standard electric energy meter at the same time. The standard electric energy meter works under the three-phase steady-state voltage signal and the three-phase steady-state current signal. The measurement verification error calculation circuit 3 calculates the pulse signal output by the measured electric energy meter and the pulse signal output by the standard electric energy meter, obtains the dynamic load measurement verification error of the measured electric energy meter, and realizes the dynamic load measurement of the measured electric energy meter Test traceability.

The method for calibrating the electric energy meter under test described in this embodiment can be used for the measurement of two electric energy meters under test. It is only necessary to control the synchronous on-off control signal OOK generated by the cycle distribution circuit 1 through a NAND gate, that is, the synchronous on-off control signal OOK generated by the distribution circuit 1 is directly input to the three-phase dynamic load corresponding to a measured electric energy meter The current signal generation circuit 2 and the synchronous on-off control signal OOK generated by the distribution circuit 1 are input to another three-phase dynamic load current signal generation circuit 2 corresponding to the electric energy meter under test after being transformed by a NAND gate. Corresponding settings can also be made to the measurement situation according to actual needs.

Specific embodiment two: the present embodiment is described below in conjunction with Fig. 1, and this embodiment is a further description to embodiment one, and the synchronous on-off control signal OOK s (t) described in this embodiment is:

$\mathrm{<span\; class="notranslate">\; the\; s</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; n</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ,</span>$

In the formula, a _n is the discrete electric energy sequence of the dynamic load current signal, n is the sequence number of the discrete electric energy sequence, and the expression of a _n is:

t is time, T is 50Hz power frequency AC cycle,

rectangular window function

N is a natural number;

The time-domain instantaneous current i _dn (t) of the OOK dynamic load in the nth control cycle under the synchronous on-off control signal OOK control mode is:

的比值为OOK动态负荷时域瞬时电流i_dn(t)的整数次谐波或分数次谐波；In the formula, I _rms is the effective value of the current in the OOK dynamic load time domain, ω is the current angular frequency in the OOK dynamic load time domain, φ _n is the instantaneous current in the OOK dynamic load time domain in the nth control cycle i _dn (t) base initial angle of the wave component or harmonic component, A is the magnitude of the harmonic component of the instantaneous current i _dn (t) in the OOK dynamic load time domain, m ₁ and m ₂ are both positive integers,

The ratio of is the integer or fractional harmonic of the instantaneous current i _dn (t) in the OOK dynamic load time domain;

m₁，m₂∈N^*，N^*为正自然数的集合，A∈Q^*，Q^*为正有理数集合，且nT≤t≤(n+1)T，当为整数时，i_dn(t)中含有整数次谐波电流分量；当

为分数时，i_dn(t)中含有非整数次谐波电流分量；ω=2πf,

m ₁ , m ₂ ∈ ^{N *} , N ^* is a set of positive natural numbers, A ∈ Q ^* , Q ^* is a set of positive rational numbers, and nT≤t≤(n+1)T, when When is an integer, i _dn (t) contains integer harmonic current components; when

When is a fraction, i _dn (t) contains non-integer harmonic current components;

The dynamic load current signal is input to the electric energy meter under test in the form of discrete electric energy sequence {E _di0 (n), E _di1 (n), E _di2 (n), ..., E _din (n)}, and E _din (n) is The dynamic load electric energy in the nth control cycle of the synchronous on-off control signal OOK, E _din (n) is expressed in the form of electric energy equivalent as:

In the formula, U _rms is the voltage effective value in the OOK dynamic load time domain, and E _q is the quantified electric energy equivalent, which is the quantified electric energy equivalent under a certain verification input condition;

Use T _A to represent the number of whole cycles of the 50Hz sinusoidal current signal included in the conduction period of a synchronous on-off control signal OOK, and use T _B to represent the number of cycles included in the turn-off period of a synchronous on-off control signal OOK The number of whole cycles of the 50Hz sinusoidal current signal,

When the dynamic load current signal input to the electric energy meter under test is the synchronous on-off control signal OOK under the conditions of T _A and T _B , the number N _A of the pulse signal output by the electric energy meter under test is collected, and the calculated value is the same as that of the electric energy meter under test. The number of output pulse signals N _A corresponds to the calculated number of pulses m ₀ of the standard electric energy meter:

${\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 3600</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 1000</span>}}{\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; I</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; u</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; J</span>}}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; *</span>\frac{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}}<span\; class="notranslate">\; ,</span>$

In the formula, C is the output pulse constant of the measured electric energy meter, and the unit is P/kWh; K _I is the transformation ratio of the current transformer externally connected to the standard electric energy meter during the calibration process; K _U is the voltage mutual inductance externally connected to the standard electric energy meter during the calibration process Transformer ratio; K _J is the wiring coefficient, C ₀ is the output pulse constant of the standard electric energy meter, and the unit is P/WS;

According to the standard pulse number m output by the measured electric energy meter under the condition of dynamic load electric energy, the dynamic load measurement calibration error γ of the measured electric energy meter is obtained as:

$\mathrm{<span\; class="notranslate">\; \&gamma;</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m</span>}}{\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 100</span>}<span\; class="notranslate">\; \%</span><span\; class="notranslate">\; ;</span>$

The synchronous on-off control signal OOK input to the measured electric energy meter is in the all-through control mode, and the three-phase steady-state voltage signal and the three-phase steady-state current signal are input to the electric energy meter under test, and the pulse signal output by the electric energy meter under test is collected The number N _S is calculated to obtain the calculated pulse number m _S0 of the standard electric energy meter corresponding to the number N _S of pulse signals output by the measured electric energy meter:

${\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 3600</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 1000</span>}}{\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; I</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; u</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; J</span>}}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; ,</span>$

According to the standard pulse number m _S corresponding to the given measured steady-state electric energy of the measured electric energy meter, trace the source of the dynamic load measurement test of the measured electric energy meter, and its traceability error γ _S is:

${\mathrm{<span\; class="notranslate">\; \&gamma;</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}}{{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 100</span>}<span\; class="notranslate">\; \%</span><span\; class="notranslate">\; .</span>$

In this embodiment, during the verification process, the current transformer connected externally to the standard electric energy meter is used for current transformation and isolation, and the voltage transformer externally connected to the standard electric energy meter is used for voltage transformation and isolation.

Specific Embodiment 3: This embodiment is a further description of Embodiment 2, and the number of _TA and _TB described in this embodiment ranges from 1 to 2000.

Embodiment 4: This embodiment is a further description of Embodiment 1, 2 or 3. The three-phase dynamic load current signal generating circuit 2 in this embodiment is a three-phase current thyristor circuit.

Embodiment 5: This embodiment is a further description of Embodiments 1, 2, 3 or 4. The dynamic load current signal generated by the three-phase dynamic load current signal generation circuit 2 in this embodiment is transient, short-term and A long-term dynamic load current signal, the transient, short-time and long-time dynamic load current signals change periodically;

The transient dynamic load current signal is: within one on-off control cycle of the synchronous on-off control signal OOK, T _A is 1 to 5;

The short-term dynamic load current signal is: within one on-off control cycle of the synchronous on-off control signal OOK, T _A is 5 to 50;

The long-term dynamic load current signal is: in one on-off control cycle of the synchronous on-off control signal OOK, T _A is 50-500.

In this embodiment, a power electronic device such as a thyristor is used to control and generate a three-phase OOK dynamic load current signal. The generated three-phase OOK dynamic load current signal is used to control the generation of three types of dynamic load energy signals:

Transient dynamic load current signal: within one OOK on-off control cycle, the number of on-cycles T _A ranges from 1 to 5, that is, the current flow time is 20ms to 100ms, which can reflect the power consumption status of rapid impact electrical equipment, etc. ;

Short-term dynamic load current signal: within one OOK on-off control cycle, the number of on-cycles T _A ranges from 5 to 50, that is, the current flow time is 100ms to 1000ms, which can reflect the impact of medium-speed electrical equipment or fluctuating loads Electricity status;

Long-term dynamic load current signal: within one OOK on-off control cycle, the number of on-cycle T _A ranges from 50 to 500, that is, the current flow time is 1s to 10s, which can reflect on-off electrical equipment or slow fluctuating loads power consumption status.

Embodiment 6: This embodiment is a further description of Embodiments 1, 2, 3, 4 or 5. After the three-phase steady-state voltage signal or the three-phase steady-state current signal in this embodiment is selected by the selection control circuit 4 A synchronous square wave control signal corresponding to the three-phase steady-state voltage signal or three-phase steady-state current signal is output, and the synchronous square wave control signal is output to the period distribution circuit 1 to generate a synchronous on-off control signal OOK.

In this embodiment, the synchronous on-off control signal OOK can be generated by the cycle distribution circuit 1 using the following control mode:

Voltage control mode: Generated by a sinusoidal steady-state voltage signal. Under the condition of three-phase four-wire connection, the periodic on-off control signal OOK is generated by the synchronous voltage square wave signal of phase A or C phase voltage shaping; The wave signal generates a periodic on-off control signal OOK.

Current control mode: Generated by a sinusoidal steady-state current signal. The periodic on-off control signal OOK is generated by the synchronous current square wave signal shaped by the A-phase, B-phase or C-phase current signal.

All-pass control mode: make power electronic devices such as thyristors always in the conduction state, and input the steady-state three-phase current signal to the electric energy meter under test.

Claims (6)

1. electric energy meter dynamic measurement cycle electric energy sequence proportional distribution check addition, it is characterized in that, it adopts three-phase steady state voltage signal or three-phase steady-state current signal to produce synchronous break-make control signal OOK by period allocated circuit (1), this break-make control signal OOK generates the dynamic load current signal by three phase dynamic load current signal generating circuit (2), and this dynamic load current signal inputs to tested electric energy meter with the form of discrete electric energy sequence; Described three phase dynamic load current signal generating circuit (2) adopts three-phase steady-state current signal as working power; Tested electric energy meter adopts three-phase steady state voltage signal as working power;

Then gather the pulse signal of tested electric energy meter output, gather simultaneously the pulse signal of standard electric energy meter output, described standard electric energy meter is worked under described three-phase steady state voltage signal and three-phase steady-state current signal, adopt electric energy meter dynamic load metering verify error counting circuit (3) that the pulse signal of tested electric energy meter output and the pulse signal of standard electric energy meter output are calculated, obtain the dynamic load metering verify error of tested electric energy meter, realize the dynamic load metrology and measurement of tested electric energy meter is traced to the source.

2. electric energy meter dynamic measurement cycle electric energy sequence proportional distribution check addition according to claim 1, is characterized in that,

Described synchronous break-make control signal OOK s (t) is:

$s\left(t\right)=\underset{n}{\mathrm{\&Sigma;}}{a}_{n}g(t-\mathrm{nT}),$

A in formula _nBe the discrete electric energy sequence of dynamic load current signal, n is the sequence number of discrete electric energy sequence, a _nExpression formula be:

T is the time, and T is the 50Hz industrial-frequency alternating current cycle,

Rectangular window function

N is natural number;

N OOK dynamic load time domain momentary current i that control cycle is interior under synchronous break-make control signal OOK control mode _dn(t) be:

I in formula _rmsBe the current effective value of OOK dynamic load time domain, ω is the electric current angular frequency of OOK dynamic load time domain, φ _nBe the OOK dynamic load time domain momentary current i in n control cycle _dn(t) initial angle of fundametal compoment or harmonic component, A is OOK dynamic load time domain momentary current i _dn(t) harmonic component amplitude, m ₁And m ₂Be positive integer,

Ratio be OOK dynamic load time domain momentary current i _dn(t) integral frequency harmonizing wave or fractional harmoni;

ω=2 π f,

m ₁, m ₂∈ N ^*, N ^*Be just natural set, A ∈ Q ^*, Q ^*Be the positive rational number set, the T of and nT≤t≤(n+1), when

During for integer, i _dn(t) contain the integral frequency harmonizing wave current component in; When

During for mark, i _dn(t) contain the non-integer harmonics current component in;

The dynamic load current signal is with discrete electric energy sequence E _di0(n), E _di1(n), E _di2(n) ..., E _din(n) } form inputs to tested electric energy meter, R _din(n) be the interior dynamic load electric energy of n control cycle of synchronous break-make control signal OOK, E _din(n) form with the electric energy equivalent is expressed as:

U in formula _rmsBe the voltage effective value of OOK dynamic load time domain, E _qFor quantizing the electric energy equivalent, it is the quantification electric energy equivalent under a certain verification initial conditions;

Use T _ABe illustrated in number complete cycle of the 50Hz sinusoidal current signal that comprises in the conduction period of 1 synchronous break-make control signal OOK, use T _BBe illustrated in number complete cycle of the 50Hz sinusoidal current signal that comprises in the blocking interval of 1 synchronous break-make control signal OOK,

The dynamic load current signal that is transfused to when tested electric energy meter is T _A, T _BDuring synchronous break-make control signal OOK under condition, gather the pulse signal number N of tested electric energy meter output _A, calculate the pulse signal number N that obtains with tested electric energy meter output _APulse number m is decided in the calculation of corresponding standard electric energy meter ₀:

$m_0=\frac{3600\&times;1000}{C*K_I*K_U*K_J}*N_A*C_0*\frac{T_A+T_B}{T_A},$

In formula, C is tested electric energy meter output meter constant, and unit is P/kWh; K _IBe the external current transformer ratio of checking procedure Plays electric energy meter; K _UBe the external voltage transformer (VT) no-load voltage ratio of checking procedure Plays electric energy meter; K _JBe connection factor, C ₀Be standard electric energy meter output meter constant, unit is P/WS;

According to the full sized pules number m that tested electric energy meter is exported under dynamic load electric energy condition, the dynamic load metering verify error γ that obtains tested electric energy meter is:

$\mathrm{\&gamma;}=\frac{m_0-m}{m}\&times;100\%;$

Make synchronous break-make control signal OOK that tested electric energy meter is transfused under the all-pass control model, with three-phase steady state voltage signal and the tested electric energy meter of three-phase steady-state current signal input, gathers the pulse signal number N that tested electric energy meter is exported _S, calculate the pulse signal number N that obtains with tested electric energy meter output _SPulse number m is decided in the calculation of corresponding standard electric energy meter _S0:

$m_{S0}=\frac{3600\&times;1000}{C*K_I*K_U*K_J}*N_S*C_0,$

The corresponding full sized pules number of given metering stable state electric energy m according to tested electric energy meter _S, tested electric energy meter is carried out the dynamic load metrology and measurement traces to the source, its error γ that traces to the source _SFor:

${\mathrm{\&gamma;}}_S=\frac{m_{S0}-m_S}{m_S}\&times;100\%.$

3. electric energy meter dynamic measurement cycle electric energy sequence proportional distribution check addition according to claim 2, is characterized in that described T _AAnd T _BThe number scope be 1～2000.

4. according to claim 2 or 3 described electric energy meter dynamic measurement cycle electric energy sequence proportional distribution check additions, is characterized in that, described three phase dynamic load current signal generating circuit (2) is the three-phase current ghyristor circuit.

5. electric energy meter dynamic measurement cycle electric energy sequence proportional distribution check addition according to claim 4, is characterized in that,

The dynamic load current signal that described three phase dynamic load current signal generating circuit (2) generates is transient state, the dynamic load current signal when long in short-term, and this transient state, the dynamic load current signal when long is the cycle and changes in short-term;

Transient state dynamic load current signal is: in the break-make control cycle of synchronous break-make control signal OOK, and T _AIt is 1～5;

The dynamic load current signal is in short-term: in the break-make control cycle of synchronous break-make control signal OOK, and T _AIt is 5～50;

When long, the dynamic load current signal is: in the break-make control cycle of synchronous break-make control signal OOK, and T _AIt is 50～500.

6. 2,3 or 5 described electric energy meter dynamic measurement cycle electric energy sequence proportional distribution check additions according to claim 1,, it is characterized in that, described three-phase steady state voltage signal or three-phase steady-state current signal are by the output synchronous square wave control signal corresponding with three-phase steady state voltage signal or three-phase steady-state current signal after selecting control circuit (4) to select, and this synchronous square wave control signal is exported to period allocated circuit (1) and produced synchronous break-make control signal OOK.

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