CN103941083A - Dual-transformation-ratio access type electric energy meter - Google Patents
Dual-transformation-ratio access type electric energy meter Download PDFInfo
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- CN103941083A CN103941083A CN201410167518.4A CN201410167518A CN103941083A CN 103941083 A CN103941083 A CN 103941083A CN 201410167518 A CN201410167518 A CN 201410167518A CN 103941083 A CN103941083 A CN 103941083A
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Abstract
The invention relates to the field of electric system high and low voltage electric quantity metering, and particularly discloses a dual-transformation-ratio access type electric energy meter. The dual-transformation-ratio access type electric energy meter comprises a power side current transformer, a wiring terminal, a relay, a current transmitter, an electric signal collecting and processing unit and an electric energy meter control unit. The current ration can be controlled in real time according to the electric unit loading condition, and metering device safety and power grid safety are guaranteed. The human intervention operation is not needed, power supply unit service quality is improved, manpower cost and material cost are saved, the operation with a power failure is not needed, production efficiency is improved, metering accuracy is improved, and the fairness of electric commodity transaction is guaranteed. Service conflicts of a power supply unit and an electric unit are greatly eliminated, the power grid safety is guaranteed, and power supply system metering technology changes and orderly development of social productive forces are profoundly influenced.
Description
Technical field
The present invention relates to electric system high-low pressure electric quantity metering field, specifically disclose a kind of two no-load voltage ratio access electric energy meter.
Background technology
For a long time, electric system generally adopts two kinds of way of energy measurings:
Mode one: straight-through electronic energy meter, power supply directly enters metering, is practically applicable to the little self-employed businessman of numerous residents and electricity consumption;
Mode two: through current transformer access electric energy meter, electric weight is calculated as the electric energy meter number of degrees and is multiplied by the multiplying power of current transformer, is practically applicable to the user that enterprises and institutions and power consumption are larger.
Account for 88% of whole society's delivery with the power consumption that mode two is measured, concerning the main body of social economy and social employment.The selection of this class current transformer ratio generally has two kinds:
The first is high pressure measurement, and power supply unit calculates one group of high-tension current inductor current ratio by transformer rated capacity;
The second is low-temperature measurement, and power supply unit is by calculating one group of low-voltage current mutual inductor current ratio with electric unit nominal load.
Above two kinds of current transformers are according to determining current transformer current ratio by the actual electricity consumption situation of electric unit, if will reduce load by electric unit, original current transformer and electric energy meter just cannot accurate measurements, cause electric weight to leak meter; If will increase load by electric unit, original current transformer and electric energy meter overload also cannot accurate measurements, when serious, can burn relevant device, cause regional power outage.
Power supply unit solves the way of underload and overload at present: require, by electric unit, many cover measuring apparatus are installed, during as underloading, zero load, use a set of measuring apparatus, when normal production, use a set of measuring apparatus, when overload, dilatation, use a set of measuring apparatus, power supply unit will be according to the relevant measuring apparatus of electricity consumption specific load situation switching, can efficient solution measure definitely misalignment and overload problem like this, but increase greatly electricity consumption specific investment cost and power supply unit human cost.
In order to solve electricity consumption specific investment measuring apparatus cost, the expert of the relevant metering of power supply unit afterwards adopts two no-load voltage ratios while dividing two kinds of situation suggestion mutual inductor producers to produce current transformer, no-load voltage ratio (S1 when a kind of situation is unloaded, and rated load no-load voltage ratio (S1 S2), S3) two no-load voltage ratio (S1 of a current transformer of composition, S2, S3); Another kind of situation is rated load no-load voltage ratio (S1, S2) no-load voltage ratio (S1 and when overload, dilatation, S3) two no-load voltage ratio (S1 of a current transformer of composition, S2, S3), power supply unit generally measures electric weight at the initial stage of installing by electric unit according to rated load current ratio access electric energy meter, if just must arrive power supply unit when wanting dilatation load or reduce load by electric unit applies in advance, power supply unit according in 10 working days of flow arrangement relevant staff to having a power failure and switch current ratio with place of electric unit supply line, and handle relevant no-load voltage ratio formality.Can effectively solve like this electricity consumption unit throws
Money cost and metering misalignment, overload problem, but alternation procedure complexity like this, the time is long, needs line outage, brings loss economically to power supply enterprise with by electric unit.If with electric unit increasing and decreasing load at short notice, power supply unit just cannot meet the electric unit demand of using.If now will cause measuring misalignment by electric unit load shedding, will cause measuring apparatus gently if increase load by electric unit, damage, when serious, cause power grid accident to have a power failure, have serious consequences to power grid security and social stability, lose inestimable.
Summary of the invention
The object of the present invention is to provide a kind of two no-load voltage ratio access electric energy meter, accurate, the safety of measuring apparatus metering while ensureing to increase and decrease power load in real time by electric unit, reduce electric cost investment, stops to burn because of measuring apparatus the security incident causing.
The present invention includes mains side current transformer, connection terminal, relay, current transducer, electrical signal collection processing unit and electric energy meter control module, it is characterized in that:
Described mains side current transformer is two no-load voltage ratio mutual inductors, and its secondary connection comprises one group little no-load voltage ratio signal transmission route and one group of large velocity ratio signal transmission route; Described connection terminal comprises the current terminal being arranged on current signal transfer route and is arranged on the voltage terminal on pressure-wire;
Described relay, its moving contact, normally closed contact and normally opened contact connect current terminal, its coil access electric energy meter control module;
Described current transducer, is converted to the signal that can be gathered by electric energy meter in order to handle through the load-side current signal of mains side current transformer;
Described electrical signal collection processing unit, the electric signal coming in order to gather, to process current transducer transmission, electrical signal collection processing unit compares and calculates current electric quantity according to the load-side current value and the predetermined current definite value that receive, and preserve the related data after no-load voltage ratio switching, electric energy meter control module pilot relay switching.
Beneficial effect:
1. control in real time current ratio according to electricity consumption specific load situation, ensure measuring apparatus safety and power grid security;
2. without human intervention operation, improve power supply unit service quality, save human and material resources cost;
3. without the operation that has a power failure, enhance productivity;
4. improve metering accuracy, ensure the fairness of electric power commodity transaction;
The present invention has greatly solved power supply unit and the service contradiction of using electric unit, has ensured power grid security, is that electric power system measurement technology is changed and social productive forces orderly development produces far-reaching influence.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of a specific embodiment of the present invention.
Fig. 2 is the circuit theory diagrams of a specific embodiment of the present invention.
Fig. 3 is the circuit theory diagrams of a specific embodiment of the present invention.
Embodiment
The present invention is made up of mains side current transformer, input voltage, connection terminal, pilot relay, current transducer, electrical signal collection processing unit and electric energy meter control module.
Mains side current transformer L, L2, L3 are two no-load voltage ratios, its secondary connection AS1 and AS2, BS1 and BS2, CS1 and CS2 are respectively current transformer L1, L2, the little no-load voltage ratio electric signal transmission of L3 circuit, and AS1 and AS3, BS1 and BS3, CS1 and CS3 are respectively L1, L2, L3 current transformer large velocity ratio electric signal transmission circuit.Input voltage is metered voltage signal and the required working power of device.
Connection terminal
,
,
,
,
,
,
,
,
for current terminal, connection terminal
,
,
,
for voltage terminal, wherein
,
,
,
,
,
corresponding A S1, AS2, BS1, BS2, CS1, CS2 current delivery circuit respectively,
,
,
,
,
,
respectively corresponding A S1, AS3, BS1, BS3, CS1,
CS3 transmission line,
,
,
,
corresponding A, B, C, N voltage transmission circuit respectively.
Pilot relay Q1 is magnetic relay, and J1-1, J1-2, J1-3 are magnetic relay contact, and wherein the moving contact of J1-1, J1-2, J1-3 connects respectively connection terminal
,
,
, the normally closed contact of J1-1, J1-2, J1-3 connects respectively connection terminal
,
,
, the normally opened contact of J1-1, J1-2, J1-3 connects respectively connection terminal
,
,
, pilot relay Q1 access electric energy meter control module.
Current transducer L4, L5, L6 are current signal converter, are responsible for respectively the heavy current signal of mains side current transformer L1, L2, L3 being converted to by the signal that can be gathered by electric energy meter of linear scaling output.
Electrical signal collection processing module, in order to gather, to process current transducer L4, L5, L6 and A, B, C, the next electric signal of N transmitting loop transmission, completes electric weight and calculates.
Electric energy meter control module, in order to according to power load situation control pilot relay Q1, completes the conversion of large and small no-load voltage ratio.
Further illustrate technical scheme of the present invention below in conjunction with accompanying drawing and by embodiment.
Embodiment example one:
Fig. 1 is the circuit theory diagrams of a specific embodiment of the present invention, the two no-load voltage ratio access electric energy meter schematic diagrams of three-phase and four-line, as shown in Figure 1, A, B, C three-phase input voltage arrive load-side through two transformation ratio current transformer L1, L2, L3 respectively, and A, B, C, N electric wire are incorporated to respectively voltage terminal
,
,
,
form voltage input circuit, voltage acquisition is provided to two no-load voltage ratio access electric energy meters, current transformer L1, L2, the wiring of L3 secondary current access respectively connection terminal
,
,
, through current transducer L4, L5, L6, arrive connection terminal by J1-1, J1-2, the J1-3 contact of pilot relay Q1
or
,
or
,
or
, and then return to L1, L2, L3 forms current return.
The heavy current signal conversion weak current signal that current transducer L4, L5, L6 pass through current transformer L1, L2, L3 provides current acquisition to two no-load voltage ratio access electric energy meters, and electric energy meter carries out acquisition and processing according to electric current, the voltage signal of input and completes electric energy metrical.
Electric energy meter is according to the size of load-side electric current and the comparison of the predefined parameter definite value of electric energy meter software, when load side electric current is less and lower than set parameter definite value time, electric energy meter pilot relay Q1 action, make AS1, AS2, BS1, BS2, CS1, CS2 access loop, the little no-load voltage ratio of electric current drops into, AS3, BS3, CS3 disconnect, and electric current large velocity ratio exits, the electric weight when electric weight that now electric energy meter calculates is little no-load voltage ratio.In the time that load side electric current overloads and is greater than the parameter definite value of setting, electric energy meter pilot relay Q1 returns, make AS1, AS3, BS1, BS3, CS1, CS3 access loop, electric current large velocity ratio drops into, AS2, BS2, CS2 disconnect, the little no-load voltage ratio of electric current exits, the electric weight when electric weight that now electric energy meter calculates is large velocity ratio.
Embodiment example two:
Fig. 2 is the circuit theory diagrams of a specific embodiment of the present invention, the two no-load voltage ratio access electric energy meter schematic diagrams of phase three-wire three, as shown in Figure 2, A, C two-phase input voltage arrive load-side through two transformation ratio current transformer L1, L3 respectively, and A, B, C electric wire are incorporated to respectively voltage terminal
,
,
form voltage input circuit, voltage acquisition is provided to two no-load voltage ratio access electric energy meters, current transformer L1, the wiring of L3 secondary current access respectively connection terminal
,
, through current transducer L4, L6, arrive connection terminal by J1-1, the J1-3 contact of pilot relay Q1
or
,
or
, and then return to L1, L3 formation current return.
The heavy current signal conversion weak current signal that current transducer L4, L6 pass through current transformer L1, L3 provides current acquisition to two no-load voltage ratio access electric energy meters, and electric energy meter carries out acquisition and processing according to electric current, the voltage signal of input and completes electric energy metrical.
Electric energy meter is according to the size of load-side electric current and the comparison of the predefined parameter definite value of electric energy meter software, when load side electric current is less and lower than set parameter definite value time, electric energy meter pilot relay Q1 action, make AS1, AS2, CS1, CS2 access loop, the little no-load voltage ratio of electric current drops into, AS3, CS3 disconnect, and electric current large velocity ratio exits, the electric weight when electric weight that now electric energy meter calculates is little no-load voltage ratio.In the time that load side electric current overloads and is greater than the parameter definite value of setting, electric energy meter pilot relay Q1 returns, and makes AS1, AS3, CS1, CS3 access loop, electric current large velocity ratio drops into, AS2, CS2 disconnect, and the little no-load voltage ratio of electric current exits, the electric weight when electric weight that now electric energy meter calculates is large velocity ratio.
Embodiment example three:
Fig. 3 is the circuit theory diagrams of a specific embodiment of the present invention, is single-phase pair of no-load voltage ratio access electric energy meter schematic diagram, and as shown in Figure 3, L phase input voltage is through two transformation ratio current transformer L1 to load-side, and L, N electric wire are incorporated to respectively voltage terminal
,
form voltage input circuit, voltage acquisition is provided to two no-load voltage ratio access electric energy meters, current transformer L1 secondary current wiring access connection terminal
, through current transducer L4, arrive connection terminal by the J1-1 contact of pilot relay Q1
or
, and then return to L1 formation current return.
The heavy current signal conversion weak current signal that current transducer L4 passes through current transformer L1 provides current acquisition to two no-load voltage ratio access electric energy meters, and electric energy meter carries out acquisition and processing according to electric current, the voltage signal of input and completes electric energy metrical.
Electric energy meter is according to the size of load-side electric current and the comparison of the predefined parameter definite value of electric energy meter software, when load side electric current is less and lower than set parameter definite value time, electric energy meter pilot relay Q1 action, make AS1, AS2 access loop, the little no-load voltage ratio of electric current drops into, AS3 disconnects, and electric current large velocity ratio exits, the electric weight when electric weight that now electric energy meter calculates is little no-load voltage ratio.In the time that load side electric current overloads and is greater than the parameter definite value of setting, electric energy meter pilot relay Q1 returns, and makes AS1, AS3 access loop, and electric current large velocity ratio drops into, and AS2 disconnects, and the little no-load voltage ratio of electric current exits, the electric weight when electric weight that now electric energy meter calculates is large velocity ratio.
Embodiment of the present invention is only the description that the preferred embodiment of the present invention is carried out; not design of the present invention and scope are limited; do not departing under the prerequisite of design philosophy of the present invention; various modification and improvement that in this area, engineering technical personnel make technical scheme of the present invention; all should fall into protection scope of the present invention; the technology contents of request protection of the present invention, has all been documented in claims.
Claims (2)
1. two no-load voltage ratio access electric energy meters, comprise mains side current transformer, connection terminal, relay, current transducer, electrical signal collection processing unit and electric energy meter control module, it is characterized in that:
Described mains side current transformer is two no-load voltage ratio mutual inductors, and its secondary connection comprises one group little no-load voltage ratio signal transmission route and one group of large velocity ratio signal transmission route; Described connection terminal comprises the current terminal being arranged on current signal transfer route and is arranged on the voltage terminal on pressure-wire;
Described relay, its moving contact, normally closed contact and normally opened contact connect current terminal, its coil access electric energy meter control module;
Described current transducer, is converted to the signal that can be gathered by electric energy meter in order to handle through the load-side current signal of mains side current transformer;
Described electrical signal collection processing unit, the electric signal coming in order to gather, to process current transducer transmission, electrical signal collection processing unit compares according to the load-side current value and the predetermined current definite value that receive, electric energy meter control module pilot relay switching.
2. according to claim 1 pair of no-load voltage ratio access electric energy meter, it is characterized in that described relay is in order to little no-load voltage ratio signal transmission route input, the excision of large velocity ratio signal transmission route in the time that load-side current value is less than predetermined current definite value, calculate current electric quantity, and preserve the related data after little no-load voltage ratio drops into, in the time that load-side current value is greater than predetermined current definite value, little no-load voltage ratio signal transmission route excision, large velocity ratio signal transmission route drop into, calculate current electric quantity, and preserve the related data after large velocity ratio drops into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410167518.4A CN103941083A (en) | 2014-04-24 | 2014-04-24 | Dual-transformation-ratio access type electric energy meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410167518.4A CN103941083A (en) | 2014-04-24 | 2014-04-24 | Dual-transformation-ratio access type electric energy meter |
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| CN103941083A true CN103941083A (en) | 2014-07-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104991482A (en) * | 2015-05-04 | 2015-10-21 | 保定双寅电气有限公司 | Dual transformation ratio metering intelligent controlling device and control mode thereof |
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2014
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| JP2001116772A (en) * | 1999-10-20 | 2001-04-27 | Meidensha Corp | Current transformer |
| CN2465193Y (en) * | 2001-01-21 | 2001-12-12 | 贾维波 | Automatic convertion measurer for composit rate changing current mutual inductor |
| CN1395108A (en) * | 2002-06-20 | 2003-02-05 | 许孝玉 | Multi-ratio load electric power metering device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104991482A (en) * | 2015-05-04 | 2015-10-21 | 保定双寅电气有限公司 | Dual transformation ratio metering intelligent controlling device and control mode thereof |
| CN104991482B (en) * | 2015-05-04 | 2017-10-17 | 保定双寅电气有限公司 | Double no-load voltage ratio metering intelligent controlling devices and its control mode |
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Application publication date: 20140723 |