CN101221229A - Method for testing synthetic measuring error of high tension electric energy metering installation - Google Patents

Abstract

The invention provides a method for testing the integrating measurement error of a measurement device of high-voltage electric energy and comprises the following steps: a pulse collecting and sending equipment is used for implementing the electric energy pulse sampling of an electric energy meter of the measurement device of high-voltage electric energy, and the collected electric energy pulse is sent out immediately through the radio signal representing the electric energy pulse; a radio receiving equipment is used for receiving the radio signal representing the electric energy pulse which is sent by the pulse collecting and sending equipment, restoring the radio signal to the pulse signal, and sending the pulse signal to an on-site testing meter of an AC meter which is connected with the radio receiving equipment; the on-site testing meter of the AC meter implements the voltage and electric current sampling and the electric energy testing on a low-voltage end of an electric transformer; the on-site testing meter of the AC meter computes and displays the integrating measurement error of the measurement device of high-voltage electric energy according to the input parameters which are related to the electric transformer. The method implements the remote sampling and the real-time transmission of the electric energy pulse of the electric energy meter to be tested and achieves the goal that the measured error is closer to be accurate.

Description

The method of testing synthetic measuring error of high tension electric energy metering installation

Technical field

The present invention relates to a kind of method of test and measuring error, specifically, related to a kind of method of testing synthetic measuring error of high tension electric energy metering installation.

Background technology

High-voltage electric-energy meter is a kind of visual plant of electric-power metering, whether normally its synthetic measuring error is to weigh this equipment fundamental of operation, for this reason, for electric-power metering department, need often high-voltage electric-energy meter to be carried out the test of synthetic measuring error, whether meet job requirement to judge high-voltage electric-energy meter.

In the prior art, the method for testing of high-voltage electric-energy meter being carried out synthetic measuring error is a lot, but most methods is to follow traditional test thinking, and there is following shortcoming in it: method of testing clumsiness, inefficiency and test error are not accurate enough; Just because of this, these class methods are eliminated gradually;

In recent years, carry out the synthetic measuring error test at high-voltage electric-energy meter, a kind of method of testing of utilizing wireless transmission that the high-voltage electric-energy meter electrical energy pulse is sampled has appearred, as shown in Figure 1, its test philosophy is: main frame articulates photoelectric sampler and carries out the electrical energy pulse sampling at the high-voltage electric-energy meter place; Extension set is then in power transformer low pressure end sampling voltage, and carries out current sampling with big Clipstyle ammeter, and extension set sends to main frame with the power that measures by wireless mode; After main frame receives power,, calculate and show the composition error of total system on main frame according to the electrical energy pulse that the parameter of importing and main frame collect; The shortcoming that this method exists:

(1) because extension set sends main frame to is power data, power is mean value, and real-time is relatively poor, and when main frame came the error of calculation with this performance number with the pulse signal that samples, error robustness was bad;

(2) owing to need and show correlated results at the host computer side input parameter, main frame must have keyboard, display unit and arithmetic element, system complex, and the cost height, simultaneously, this main computer unit volume is bigger;

(3) main frame is when the error of calculation, owing to do not consider the loss of power transformer, result calculated can not reflect the composition error of high-voltage electric-energy meter comparatively accurately, and in the power transformer load factor hour, can there be bigger deviation in this method especially.

In order to solve the problem of above existence, people are seeking a kind of desirable technical solution always.

Summary of the invention

Goal of the invention of the present invention is at the deficiencies in the prior art, thereby provide a kind of real-time, error robustness good, the method for easy to operate testing synthetic measuring error of high tension electric energy metering installation, this method has mainly realized tested electric energy meter is carried out remote sampling of electrical energy pulse and real-time Transmission, and has reached error testing and more be bordering on purpose accurately.

In order to realize the foregoing invention purpose, the invention provides a kind of method of testing synthetic measuring error of high tension electric energy metering installation, may further comprise the steps:

Step 1, the electric energy meter of high-voltage electric-energy meter is carried out the electrical energy pulse sampling, and the electrical energy pulse IMU that collects crossed represent the radio signal of electrical energy pulse to send by pulse collection, transmitting apparatus;

Step 2, accept the radio signal of the representative electrical energy pulse that pulse collection, transmitting apparatus send by radio receiver, and this radio signal is reduced to pulse signal, this pulse signal is passed to be attached thereto the AC energy meter on-spot tester that connects;

Step 3, AC energy meter on-spot tester are at power transformer low pressure end sampling voltage, electric current and test electric energy;

The composition error of high-voltage electric-energy meter is calculated and shown to step 4, AC energy meter on-spot tester according to the correlation parameter of the power transformer of input.

The relative prior art of the present invention has outstanding substantive distinguishing features and obvious improvement, and specifically, this method has following advantage:

1, this method wireless transmission is the electrical energy pulse signal of tested high-voltage electric-energy meter, for on-spot tester, is identical with generally surveying electric energy meter error, and error robustness is good;

2, this method is on the basis of tester at the scene, increases pulse wireless transmission, receiving equipment, and the change corresponding software, and therefore, system is simple, and cost is low, and volume is little, and is easy to use;

3, this method according to the correlation parameter and the secondary load of surveying power transformer of the power transformer of importing, has been considered the loss of power transformer when the error of calculation, and result calculated has embodied the composition error of high-voltage electric-energy meter accurately.

Description of drawings

Fig. 1 is the test philosophy synoptic diagram of a kind of method in the prior art of the present invention;

Fig. 2 is the test philosophy synoptic diagram of the method for the invention;

Fig. 3 is the principle of work synoptic diagram of pulse collection of the present invention, transmitting apparatus;

Fig. 4 is the principle of work synoptic diagram of radio receiver of the present invention.

Embodiment

Below by the drawings and specific embodiments, technical scheme of the present invention is described in further detail.

As shown in Figure 2, a kind of method of testing synthetic measuring error of high tension electric energy metering installation may further comprise the steps:

Step 1, the electric energy meter of high-voltage electric-energy meter is carried out the electrical energy pulse sampling, and the electrical energy pulse IMU that collects crossed represent the radio signal of electrical energy pulse to send by pulse collection, transmitting apparatus;

Step 2, accept the radio signal of the representative electrical energy pulse that pulse collection, transmitting apparatus send by radio receiver, and this radio signal is reduced to pulse signal, this pulse signal is passed to be attached thereto the AC energy meter on-spot tester that connects;

Step 3, AC energy meter on-spot tester carry out electric current in power transformer low pressure end sampling voltage with big Clipstyle ammeter, the test electric energy;

Step 4, AC energy meter on-spot tester calculate and show the composition error of high-voltage electric-energy meter according to the parameter of importing; Described parameter mainly comprises the correlation parameter of power transformer.

As shown in Figure 3, described pulse collection, transmitting apparatus are responsible for being gathered electrical energy pulse and sending wireless signal by school electric energy meter place;

Described pulse collection, transmitting apparatus are made up of power circuit, impulse sampling circuit, signal encoding circuit, wireless transmission circuit four parts;

The electrical energy pulse that described impulse sampling circuit collects photoelectric sampler or electronic watch taps carries out shaping to be handled; Interference free performance when transmitting for improving pulse wireless, pulse information is expressed with a string coded signal, and the signal encoding circuit is finished this task; Described wireless transmission circuit with this coded modulation to radio frequency, power amplification after antenna launch; Obtain power supply in order to adapt to from the table tail of high pressure or low-voltage electric energy table, the input range of power circuit must be able to bear and exchange 90～420V, and this power circuit has passed through particular design to satisfy this requirement.

As shown in Figure 4, described radio receiver is connected with on-spot tester, and it is done the wireless signal that receives and passes to on-spot tester after reduction is handled;

Described radio receiver includes also primary circuit of radiofrequency signal receiving circuit and decode pulses; The radiofrequency signal receiving circuit is finished the function of the amplification of radio frequency weak signal, demodulation, and the coding that demodulates restores the pulse signal that collects behind decode pulses reduction circuit decoding, and gives the on-spot tester that it connects with this pulse signal; The working power of radio receiver is provided by on-spot tester.

Because described pulse collection, transmitting apparatus and radio receiver distance in use are far away, should possess the wireless transmission capability of certain distance;

Among the present invention, photoelectric sampler or electronic watch taps are adopted in the collection of pulse signal or transmission.

In order can clearerly to say something, existing test philosophy with method of testing of the present invention is described below:

If ignore the hi-line loss, high-voltage electric-energy meter institute is in respect of the merit power P_HV, electric energy E_HV, power transformer active loss power Δ P, electric energy Δ E, and power transformer active power of output P_LV, electric energy E_LV, should meet following relationship:

P_HV＝ΔP+P_LV (1)

E_HV＝ΔE+E_LV (2)

Wherein, power transformer active power of output P_LVAnd electric energy E_LVAvailable on-spot tester is by the electric current split-core type meter, and the secondary side that is connected on power transformer records in real time;

Power transformer active loss power Δ P and electric energy Δ E can be calculated by on-spot tester in real time by following formula:

ΔP＝P₀+β²P_K (3)

In the formula: P₀---be open circuit loss, tabling look-up according to the power transformer specifications and models obtains;

P_K---be the nominal load loss, tabling look-up according to the power transformer specifications and models obtains;

β---be load factor, the ratio of actual loading and nominal load, available on-the-spot the survey

The three-phase actual current of the power transformer low-pressure side that the examination instrument measures obtains than last rated current.

For high-voltage electric-energy meter, its institute is in respect of the merit power P_HVAnd electric energy E_HVCan obtain by following measuring method:, can calculate high-voltage electric-energy meter institute in respect of merit power and electric energy according to ammeter constant, TA and the TV no-load voltage ratio of electric energy meter to the sampling of the electrical energy pulse of electric energy meter in the high-voltage electric-energy meter.

The value of surveying according to on-spot tester, and utilize wireless mode to be transferred to high-voltage electric-energy meter on-spot tester, that measure gained institute in respect of merit power and electric energy, according to following formula calculation error:

Error E rr=(E_HV-(Δ E+E_LV))/(Δ E+E_LV) (4)

At Δ E, E_LVMeasure under the correct prerequisite, this error amount is the active energy error in dipping of tested high-voltage electric-energy meter.

At last of particular note: this method equally also is applicable to the reactive energy error in dipping of high-voltage electric-energy meter.

Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characterictic is equal to replacement the specific embodiment of the present invention; And not breaking away from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.

Claims (1)

1. the method for a testing synthetic measuring error of high tension electric energy metering installation is characterized in that, may further comprise the steps:

Step 1, the electric energy meter of high-voltage electric-energy meter is carried out the electrical energy pulse sampling, and the electrical energy pulse IMU that collects crossed represent the radio signal of electrical energy pulse to send by pulse collection, transmitting apparatus;

Step 2, accept the radio signal of the representative electrical energy pulse that pulse collection, transmitting apparatus send by radio receiver, and this radio signal is reduced to pulse signal, this pulse signal is passed to be attached thereto the AC energy meter on-spot tester that connects;

Step 3, AC energy meter on-spot tester are at power transformer low pressure end sampling voltage, electric current and test electric energy;

The composition error of high-voltage electric-energy meter is calculated and shown to step 4, AC energy meter on-spot tester according to the correlation parameter of the power transformer of input.

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