CN201425620Y - Testing power source used for checking errors of high-voltage electric energy metering device - Google Patents

Abstract

The utility model discloses a testing power source used for checking errors of a high-voltage electric energy metering device, which comprises a control keyboard, a power amplifier, a voltage booster,a current booster, a low-voltage signal unit, a voltage signal sensor, a current signal sensor and the like. Low-voltage and low-current signals which are outputted by an output end of the low-voltage signal unit are amplified via the voltage and current power amplifier and processed through the pressure booster and the current booster to generate high-voltage and high-current signals, the high-voltage and high-current signals are then outputted to a three-phase power cord so as to provide a working power source for the high-pressure electric energy metering device, the voltage signal sensorand the current signal sensor are arranged on the three-phase power cord, and outputs of the voltage signal sensor and the current signal sensor are fed back to a low-voltage power signal generating unit, thereby being capable of stabilizing power output. Through utilizing the above technical scheme, the volume and the weight of the testing power source can meet requirements of fast and convenientin-site checking.

Description

The experiment power supply that is used for error check of high-voltage electric energy metering device

Technical field

The utility model relates to the power measuring instrument of power equipment automatic field, relates in particular to a kind of on-the-spot high voltage, cranking test power supply that high-voltage electric-energy meter is carried out error checking that be used for.

Background technology

In the power automation field, global error field-checking to high-voltage electric-energy meter needs three-phase high voltage, high-current supply, for example: the electric power meter to a 10kV, 100A carries out error checking, by maximum current is that 120% of rated voltage and electric current calculates, and then the equivalent capacity of experiment power supply is:

$S=\sqrt{3}\mathrm{UI}=\sqrt{3}\×12\mathrm{kV}\×120A\≈2.5\mathrm{MVA}$

Yet it is very difficult will obtaining powerful like this stabilized power source, because such experiment power supply volume and weight is all very big, and cost is also very expensive, therefore, obviously can not satisfy the requirement of high-voltage electric-energy meter being carried out site test.

The utility model content

In view of this, fundamental purpose of the present utility model is to provide a kind of experiment power supply that high-voltage electric-energy meter carries out error checking that is used for, by reducing the volume and weight of experiment power supply, to satisfy the demand of in-site measurement to required high voltage, cranking test power supply.

For achieving the above object, the technical solution of the utility model is achieved in that

A kind of experiment power supply that is used for error check of high-voltage electric energy metering device, this experiment power supply comprise supervisory keyboard (101), low-voltage signal unit (102), power amplifier (103), stepup transformer (104), current lifting device (105), current signal sensor (106) and voltage signal sensor (107); Wherein:

Supervisory keyboard (101), link to each other with described low-voltage signal unit (102), be used to import required voltage, current parameters, produce low pressure three-phase voltage signal and two-phase/three-phase current signal, thereby regulate the generation of control low voltage voltage, current signal with control low-voltage signal unit (102);

Low-voltage signal unit (102), be used for as the signal source that produces low pressure three-phase voltage, two-phase/three-phase current, and accept the parameters that current signal sensor (106) and voltage signal sensor (107) are fed back, to stablize the output of described low-voltage signal unit (102);

Power amplifier (103) is used to amplify voltage, the current signal of described low-voltage signal unit (102) output, and voltage, the current signal after will amplifying then imported stepup transformer (104) and current lifting device (105) respectively;

Stepup transformer (104) and current lifting device (105), the voltage that is used for described power amplifier (103) is exported, current signal through power amplification, boost, up-flow provides the high voltage that suits the requirements, the signal of big electric current after handling;

Current signal sensor (106) and voltage signal sensor (107), be arranged on through carrying on the three-phase power line of high voltage, big current signal after described stepup transformer (104) and current lifting device (105) processing, be used for providing feedback signal, stablize the voltage of this low-voltage signal unit (102), the output of current signal to described low-voltage signal unit (102).

Wherein: described power amplifier (103) is numeric type power amplifier, switching mode power amplifier or linear power amplifier.

Described stepup transformer (104) is two groups of independently stepup transformers and with V/V mode of connection output, perhaps be three groups independently stepup transformer perhaps directly export with the Y or the D mode of connection by one group of three-phase voltage increasing device; Described current lifting device (105) is two groups of all insulation current lifting devices or three groups of all insulation current lifting devices.

The degree of stability of described experiment power supply realizes according to the feedback of output signal, obtains the equal proportion signal by current signal sensor (106), voltage signal sensor (107), realizes follow-up by direct introducing signal source; Or pass through to introduce the signal that other surveying instrument is accurately measured, and read the soft feedback of realization by described low-voltage signal unit (102).

Described voltage signal sensor (107) is the two standard sets voltage transformer (VT), or is three groups of standard potential transformers, perhaps is three groups of resitstance voltage divider, capacitive divider or RC divider relatively;

Described current signal sensor (106) is standard current transformer or shunt, and described current signal sensor (106) is used two groups or three groups.

Realization that the utility model provides be used for the experiment power supply that high-voltage electric-energy meter carries out error checking, have the following advantages:

The utility model experiment power supply can reach the less power of output by the independent design and the signal feedback of voltage, current return, can produce the requirement of satisfying site test necessary high voltages, big current signal; Though its output power decreases, can make the volume and weight of this experiment power supply satisfy the requirement of field-checking convenience.

Description of drawings

Fig. 1 is the illustrative view of functional configuration of the experiment power supply of the utility model global error of high voltage energy metering installation verification.

Embodiment

Below in conjunction with accompanying drawing and embodiment of the present utility model device of the present utility model is described in further detail.

Basic thought of the present utility model is: the experiment power supply of high-voltage electrical energy metering system is pressed the separately design of voltage, current source, and converge at high-voltage output end, by adopting special insulation processing and circuit structure, make electric current and voltage form different loops, thereby obtain lower powered high voltage, cranking test power supply.Described experiment power supply mainly by low-voltage signal source, voltage/current power amplifier, boost/current lifting device and feedback signal several parts of taking a sample constitute, by low-voltage signal source output low voltage voltage, current signal, obtain the voltage and current signal of certain power through the voltage/current power amplifier, and then by boosting/current lifting device output HIGH voltage, big current signal.The supply voltage of output depends on stepup transformer output, and electric current depends on current lifting device output, obtains the equivalent high-voltage great-current experiment power supply that can control.The capacity of voltage segment only need be considered the voltage circuit power consumption of voltage signal sensor, tested high-voltage electric-energy meter, the loss and the test loop loss of stepup transformer, the capacity of current segment only need be considered the current return power consumption and the test loop loss of current lifting device loss, current signal sensor, tested high-voltage electric-energy meter, thereby as long as provides less power just can meet the demands respectively.

Fig. 1 is the illustrative view of functional configuration of the experiment power supply of the utility model global error of high voltage energy metering installation verification, as shown in Figure 1, described experiment power supply comprises: supervisory keyboard 101, low-voltage signal unit 102, power amplifier 103, stepup transformer 104, current lifting device 105, current signal sensor 106, voltage signal sensor 107.Wherein:

Supervisory keyboard 101, be used to import basic parameters such as required voltage, electric current, produce low pressure three-phase voltage signal and two-phase (to two elements method electric power meter) or three-phase (to three element method electric power meter) current signal with control low-voltage signal unit 102, thereby regulate the generation of control low voltage voltage, current signal.

Here, phase angle can be provided with in advance between described each phase current voltage, and voltage and current signal output effective value also can be set respectively certainly, the harmonic wave that on voltage and current signal, can superpose respectively, and output frequency can be set in 40 ~ 60 hertz of scopes.

Low-voltage signal unit 102 is used for the signal source that produces as low pressure three-phase voltage, two-phase (to two elements method electric power meter)/three-phase (to three element method electric power meter) electric current.

Here, described low-voltage signal unit 102 is provided with display screen, can demonstration work export situation and show the parameters that current signal sensor 106 and voltage signal sensor 107 feed back.

Power amplifier 103 is used to amplify voltage, the current signal of 102 outputs of described low-voltage signal unit, and voltage, current signal after will amplifying are then imported stepup transformer 104 and current lifting device 105 respectively.

Here, described power amplifier 103 can be numeric type power amplifier, switching mode power amplifier, also can be linear power amplifier.

Stepup transformer 104 and current lifting device 105, the voltage that is used for described power amplifier 103 is exported, current signal through power amplification, boost, after up-flow handles, for high-voltage electric-energy meter 108 is provided for the simulated conditions of work, promptly provide the input signal of high voltage, big electric current.Described stepup transformer 104 be two groups independently stepup transformer with V/V mode of connection output, perhaps be three groups independently stepup transformer perhaps directly export with the Y or the D mode of connection by one group of three-phase voltage increasing device.Described current lifting device 105 is two groups of all insulation current lifting devices (at two elements method electric power meter) or three groups of all insulation current lifting devices (at three element method electric power meter).

Here, the feedback signal sampling is finished by current signal sensor 106 and voltage signal sensor 107, they are separately positioned on through carrying on the three-phase power line of high voltage and current signal after described stepup transformer 104 and current lifting device 105 processing, be used for providing feedback signal, with the voltage of stablizing this low-voltage signal unit 102, the output of current signal to described low-voltage signal unit 102.Here, described voltage signal sensor 107 is for the two standard sets voltage transformer (VT) and with V/V mode of connection output (being used for two elements method electric power meter is measured); Or be that three groups of standard potential transformers are exported (being used for three element method electric power meter is measured) with the Y or the D mode of connection, perhaps three groups of resistance, electric capacity or groups are relatively held voltage dividers; Described current signal sensor 106 is standard current transformer or shunt, and when being used for the two elements electric power meter measured, described current signal sensor 106 is used two groups; When being used for three element method electric power meter measured, then described current signal sensor 106 is used three groups, and described current sensor can be CT, shunt etc.

The mode that obtains the feedback signal of experiment power supply has: obtain the equal proportion signal by current signal sensor 106, voltage signal sensor 107, realize follow-up by direct introducing signal source; Or pass through to introduce the signal that other surveying instrument is accurately measured, and read the soft feedback of realization by described low-voltage signal unit 102.

High-voltage electric-energy meter 108 is used to connect the three-phase power line that carries high voltage, big current signal after described stepup transformer 104 and current lifting device 105 processing, carries out error checking work to utilize this high voltage, big current signal.

Here, described low-tension supply signal element 102, the low-tension current, the voltage signal that produce, by its output terminal respectively after power amplifier 103 amplifies, link to each other with current lifting device 105 with stepup transformer 104 respectively again, and with both output signal by exporting on the three-phase power line, export to high-voltage electric-energy meter 108 by three-phase power line; Described voltage signal sensor 106 and current signal sensor 107 are arranged on the described three-phase power line, it is between tested high-voltage electric-energy meter 108 and described stepup transformer 104 and current lifting device 105, with the equivalent position of described high-voltage electric-energy meter 108 work; In addition, the output terminal of described voltage signal sensor 106 and current signal sensor 107 is connected with described low-tension supply signal element 102 respectively.

The realization of described experiment power supply mainly comprises following process: the three-phase voltage signal of described low-voltage signal unit 102 obtains testing the three-phase test voltage of required voltage and power requirement through power amplifier 103 and stepup transformer 104; Two-phase/three-phase low-tension current the signal of described low-voltage signal unit 102 outputs (when corresponding two elements method of difference and three element method electric power meter) obtains testing the test current of required electric current and power requirement through described power amplifier 103 and current lifting device 105; And the noble potential clamper is carried out in the test current loop with trial voltage, and make current return be in high-voltage, form the three-phase output of high-tension current; The voltage of experiment power supply, current output signal feed back to low-voltage signal unit 102 and export adjusting after sampling, with the stable of the three-phase high-voltage electric current experiment power supply of the global error verification that guarantees to be used for high-voltage electric-energy meter 108 and accurately.

The experiment power supply that is used to realize on-the-spot global error of high voltage energy metering installation verification provided by the utility model is applicable to the field-checking of high-voltage electric-energy meter 108.

The above is preferred embodiment of the present utility model only, is not to be used to limit protection domain of the present utility model.

Claims (5)

1, a kind of experiment power supply that is used for error check of high-voltage electric energy metering device is characterized in that: this experiment power supply comprises supervisory keyboard (101), low-voltage signal unit (102), power amplifier (103), stepup transformer (104), current lifting device (105), current signal sensor (106) and voltage signal sensor (107); Wherein:

Supervisory keyboard (101), link to each other with described low-voltage signal unit (102), be used to import required voltage, current parameters, produce low pressure three-phase voltage signal and two-phase/three-phase current signal, thereby regulate the generation of control low voltage voltage, current signal with control low-voltage signal unit (102);

Low-voltage signal unit (102), be used for as the signal source that produces low pressure three-phase voltage, two-phase/three-phase current, and accept the parameters that current signal sensor (106) and voltage signal sensor (107) are fed back, to stablize the output of described low-voltage signal unit (102);

Power amplifier (103) is used to amplify voltage, the current signal of described low-voltage signal unit (102) output, and voltage, the current signal after will amplifying then imported stepup transformer (104) and current lifting device (105) respectively;

Stepup transformer (104) and current lifting device (105), the voltage that is used for described power amplifier (103) is exported, current signal through power amplification, boost, up-flow provides the high voltage that suits the requirements, the signal of big electric current after handling;

Current signal sensor (106) and voltage signal sensor (107), be arranged on through carrying on the three-phase power line of high voltage, big current signal after described stepup transformer (104) and current lifting device (105) processing, be used for providing feedback signal, stablize the voltage of this low-voltage signal unit (102), the output of current signal to described low-voltage signal unit (102).

2, experiment power supply according to claim 1 is characterized in that: described power amplifier (103) is numeric type power amplifier, switching mode power amplifier or linear power amplifier.

3, experiment power supply according to claim 1, it is characterized in that: described stepup transformer (104) is two groups of independently stepup transformers and export with the V/V mode of connection, perhaps be three groups independently stepup transformer perhaps directly export with the Y or the D mode of connection by one group of three-phase voltage increasing device; Described current lifting device (105) is two groups of all insulation current lifting devices or three groups of all insulation current lifting devices.

4, experiment power supply according to claim 1, it is characterized in that: the degree of stability of described experiment power supply realizes according to the feedback of output signal, obtain the equal proportion signal by current signal sensor (106), voltage signal sensor (107), realize follow-up by direct introducing signal source; Or pass through to introduce the signal that other surveying instrument is accurately measured, and read the soft feedback of realization by described low-voltage signal unit (102).

5, experiment power supply according to claim 1, it is characterized in that: described voltage signal sensor (107) is the two standard sets voltage transformer (VT), or be three groups of standard potential transformers, perhaps be three groups of resitstance voltage divider, capacitive divider or RC divider relatively;

Described current signal sensor (106) is standard current transformer or shunt, and described current signal sensor (106) is used two groups or three groups.

Images