CN102163495A - Voltage transformer - Google Patents
Voltage transformer Download PDFInfo
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- CN102163495A CN102163495A CN 201110028245 CN201110028245A CN102163495A CN 102163495 A CN102163495 A CN 102163495A CN 201110028245 CN201110028245 CN 201110028245 CN 201110028245 A CN201110028245 A CN 201110028245A CN 102163495 A CN102163495 A CN 102163495A
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Abstract
The invention provides a voltage transformer, which relates to the field of power grids, and is invented for monitoring power equipment of the intelligent power grids. The voltage transformer comprises a high-voltage arm resistor and a low-voltage arm resistor, wherein the first end of the high-voltage arm resistor is connected with a high-voltage power transmission line; and the first end of the low-voltage arm resistor is connected with the ground, the second end of the low-voltage arm resistor is connected with the second end of the high-voltage arm resistor, and a voltage signal for measurement is outputted between the first end and the second end of the low-voltage arm resistor. The voltage transformer can be used in the management of the intelligent power grids.
Description
Technical field
The present invention relates to the instrument transformer field, be meant a kind of voltage transformer especially.
Background technology
Along with the propelling that intelligent grid is built, electric power system becomes problem demanding prompt solution to the on-line monitoring of multiple power equipment.In the process of construction of intelligent grid, the operational factor of monitoring electrical network in real time is the basis, and the voltage of measuring high-tension line then is the basis on basis, has only the measurement that has realized voltage, could further calculate power, other parameters such as harmonic wave.Present method of measurement mainly is to utilize electromagnetic transformer, and its defective is that output signal is very strong, and for example voltage transformer output is the AC signal of 100V.These output signals can not be directly passed to rear end monitoring equipment instrument, but need carry out secondary conversion, and signal is reduced to voltage signal about the 5V that electronic equipment can measure, just can carry out analog digital conversion (AD conversion).Like this, owing to increased the secondary conversion, can cause certainty of measurement to reduce; Also make system complicated more, failure rate improves.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of voltage transformer, can monitor the power equipment of intelligent grid.And the signal of output is smaller, can directly send follow-up monitoring equipment to.
For solving the problems of the technologies described above, embodiments of the invention provide technical scheme as follows:
On the one hand, provide a kind of voltage transformer, comprising:
High-voltage arm resistance, first end of described high-voltage arm resistance is connected with described high voltage transmission line; Low-voltage arm resistance, first end of described low-voltage arm resistance be connected describedly, second end of described low-voltage arm resistance is connected with second end of described high-voltage arm resistance, output is measured and to be used voltage signal between first end of described low-voltage arm resistance and second end.
The resistance of described high-voltage arm resistance and described low-voltage arm resistance is between 5M Ω-100M Ω.
On the other hand, provide a kind of voltage transformer, comprising:
High-voltage arm resistance, first end of described high-voltage arm resistance is connected with described high voltage transmission line; Low-voltage arm resistance, first end of described low-voltage arm resistance be connected describedly, second end of described low-voltage arm resistance is connected with second end of described high-voltage arm resistance, output is measured and to be used voltage signal between first end of described low-voltage arm resistance and second end;
One hollow circular cylinder, described high-voltage arm resistance and described low-voltage arm resistance are arranged in the cavity of described hollow circular cylinder.
Described two hollow circular cylinders are made up of insulating material.
Embodiments of the invention have following beneficial effect:
In the such scheme, provide a kind of voltage transformer, output voltage signal can carry out on-line monitoring to the power equipment of intelligent grid.Compare with prior art in use the method for electromagnetic transformer, the signal of output is smaller, can directly send follow-up monitoring equipment to.
Description of drawings
Fig. 1 is the circuit theory schematic diagram of a kind of voltage transformer of the present invention.
Fig. 2 is the application scenarios of described voltage transformer for the present invention.
Embodiment
For technical problem, technical scheme and advantage that embodiments of the invention will be solved is clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
As shown in Figure 1, the circuit theory schematic diagram for a kind of voltage transformer of the present invention comprises:
Comprise: high-voltage arm resistance 10, first end of described high-voltage arm resistance 10 is connected with described high voltage transmission line 1; Low-voltage arm resistance 8, first end of described low-voltage arm resistance 8 be connected describedly, second end of described low-voltage arm resistance 8 is connected with second end of described high-voltage arm resistance 10, output is measured and to be used voltage signal between first end of described low-voltage arm resistance 8 and second end.
The resistance of described high-voltage arm resistance 10 and described low-voltage arm resistance 8 is between 5M Ω-100M Ω.
Two groups of voltage transformers have been shown among Fig. 1.Described high-voltage arm resistance 10 and described low-voltage arm resistance 8 are arranged in the cavity of hollow circular cylinder.Hollow circular cylinder is made up of insulating material.
Described voltage transformer also comprises: the bucking electrode (not shown) is arranged on the outside of high-voltage arm resistance 10.
Described voltage transformer also comprises: the overvoltage protection (not shown); first end of described overvoltage protection is connected with second end of described low-voltage arm resistance 8; second end of described overvoltage protection is connected with first end of described low-voltage arm resistance 8, and described overvoltage protection is arranged in the cavity of described hollow circular cylinder.
Along with the propelling that intelligent grid is built, electric power system has proposed on-line monitoring to multiple power equipment.This electronic type voltage transformer need not additionally to increase the space and places PT (voltage transformer) directly to substitute the supporting insulator of cupboard inner copper line, has effectively solved the little problem of installing space, can be installed in the transducer of line monitoring system in power distribution cabinet.
The invention provides a kind of small electrical minor voltage transformer that is exclusively used in all kinds power distribution cabinet, have following beneficial effect:
(1), is applicable to various types of power distribution cabinets, especially for the little power distribution cabinet of cupboard inner volume
(2), the built-in voltage instrument transformer, be output as electronic type signal (2V, inactivity)
(3), can export two groups measures with voltage signal (0～45kV, 0.2%)
(4), volume is little, can directly substitute the supporting insulator of cupboard inner copper line, need not additionally to increase the space and place PT.
(5), its built-in 2 cover voltage dividers, need not additionally to increase the space and place PT (voltage sensor).
The principle of electronic type voltage transformer is below described.
What electronic type voltage transformer adopted is that the electric resistance partial pressure mode is carried out work.EVT (voltage transformer) is made up of high-voltage arm resistance, low-voltage arm resistance, bucking electrode, overvoltage protection.By voltage divider primary voltage is converted to and primary voltage and the proportional small voltage signal of phase place.Adopt bucking electrode to improve the influence of Electric Field Distribution situation and stray capacitance.At secondary output highly sensitive overvoltage protection in parallel, when preventing secondary output open circuit secondary side voltage is improved.
Below explanation EVT as shown in Figure 2, is the application of EVT in digital transformer substation in application on power system.In digital transformer substation construction, the voltage signal that utilizes EVT to measure can directly be sent to collecting unit.In collecting unit, the piezoelectric voltage signal is converted into digital signal.By bus digital signal is delivered to combiner then, be sent at last in the monitoring software of digital transformer substation, further measure, measure and protect.
Electronic mutual inductor is the important technology support that digital transformer substation is built, and in fields such as power measurement and protections wide application prospect is arranged also simultaneously.Compare with traditional electromagnetic transformer, electronic type voltage transformer has following advantage.
(1), measuring range is wide.
The Hz-KHz of electronic mutual inductor is wide, the measure linear scope is wide, the linearity good, and in effective range, the voltage measuring transformer class of accuracy can reach the 0.2/3p level.
(2), application mode is flexible.
What electronic mutual inductor was exported all is the small voltage signal; be generally 1.5V～4V; this signal can be protected equipment interface with digital instrument, microcomputer measuring and controlling easily; need not to carry out the secondary conversion; thereby can reduce the complexity of system applies; reduce measure error, improved the stability and the accuracy of equipment.
(3), safe and reliable.
Electronic mutual inductor does not all contain iron core (or containing little iron core), saturated phenomenon can not occur.Even if, can not produce big electric current during the voltage transformer secondary short circuit, the danger that no overcurrent punctures can not produce ferro resonance yet, thereby guarantee the safety of the person and equipment.
(4), volume is little, low in energy consumption.
The electronic mutual inductor volume is little, in light weight, can effectively save the space, and power consumption is minimum, and power savings is very remarkable, has the feature of environment-friendly products.
(5), multipurpose.
Electronic type voltage transformer is realized primary voltage digitlization on-line monitoring as charged display unit simultaneously, and can be used as the supporting insulator use.
(6), long service life.
Because electronic mutual inductor self is low-power consumption, self coil can not produce heating, has guaranteed the useful life of instrument transformer.Install and use simple and convenient, the operation Maintenance free, useful life was greater than 30 years.
Following form is that traditional electromagnetic transformer and electronic type voltage transformer compare:
Electronic type voltage transformer of the present invention, its output signal can be the electronic signal of 4V, removes the secondary conversion from, can directly send follow-up monitoring equipment to.
In the application scenarios as shown in Figure 1, voltage transformer output signal of the present invention is a multichannel electronic type analog signal, comprising measuring with voltage secondary singal two-way.All output signals all are to isolate independently.This output signal is suitable for the measurement and the malfunction monitoring of distribution line.
The 1st drive test amount voltage secondary singal is used for the voltage of measurement circuitry.The 2nd drive test amount then connects the common port of ground connection with the voltage secondary singal, and is connected in series the resistance that resistance is suitable, and another termination the earth of resistance so just can measure the residual voltage signal on the small resistor that serial connection is gone into.Utilize this mode can solve the difficult problem that overhead distribution can't be measured residual voltage, can realize overhead transmission line and measurement residual voltage.Can be used for the monitoring of overhead transmission line short circuit and earth fault.Voltage transformer of the present invention is applicable to the measurement of overhead distribution, malfunction monitoring.Can with coordinative composition of equipments practicalities such as watt metering, on-pole switch controller, high-pressure reactive compensation device.
The above is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. a voltage transformer is characterized in that, comprising:
High-voltage arm resistance, first end of described high-voltage arm resistance is connected with described high voltage transmission line; Low-voltage arm resistance, first end of described low-voltage arm resistance be connected describedly, second end of described low-voltage arm resistance is connected with second end of described high-voltage arm resistance, output is measured and to be used voltage signal between first end of described low-voltage arm resistance and second end.
2. voltage transformer according to claim 1 is characterized in that,
The resistance of described high-voltage arm resistance and described low-voltage arm resistance is between 5M Ω-100M Ω.
3. voltage transformer according to claim 1 is characterized in that, described voltage transformer also comprises: bucking electrode is arranged on the outside of high-voltage arm resistance.
4. according to each described voltage transformer of claim 1 to 2; it is characterized in that; described voltage transformer also comprises: overvoltage protection; first end of described overvoltage protection is connected with second end of described low-voltage arm resistance, and second end of described overvoltage protection is connected with first end of described low-voltage arm resistance.
5. a voltage transformer is characterized in that, comprising:
High-voltage arm resistance, first end of described high-voltage arm resistance is connected with described high voltage transmission line; Low-voltage arm resistance, first end of described low-voltage arm resistance be connected describedly, second end of described low-voltage arm resistance is connected with second end of described high-voltage arm resistance, output is measured and to be used voltage signal between first end of described low-voltage arm resistance and second end;
One hollow circular cylinder, described high-voltage arm resistance and described low-voltage arm resistance are arranged in the cavity of described hollow circular cylinder.
6. voltage transformer according to claim 5 is characterized in that,
Described two hollow circular cylinders are made up of insulating material.
7. voltage transformer according to claim 5 is characterized in that,
The resistance of described high-voltage arm resistance and described low-voltage arm resistance is between 5M Ω-100M Ω.
8. voltage transformer according to claim 5 is characterized in that, described voltage transformer also comprises: bucking electrode is arranged on the outside of high-voltage arm resistance.
9. according to each described voltage transformer of claim 5 to 8; it is characterized in that; described voltage transformer also comprises: overvoltage protection; first end of described overvoltage protection is connected with second end of described low-voltage arm resistance; second end of described overvoltage protection is connected with first end of described low-voltage arm resistance, and described overvoltage protection is arranged in the cavity of described hollow circular cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110028245 CN102163495A (en) | 2011-01-26 | 2011-01-26 | Voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110028245 CN102163495A (en) | 2011-01-26 | 2011-01-26 | Voltage transformer |
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| CN102163495A true CN102163495A (en) | 2011-08-24 |
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| CN 201110028245 Pending CN102163495A (en) | 2011-01-26 | 2011-01-26 | Voltage transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680758A (en) * | 2012-05-14 | 2012-09-19 | 华中科技大学 | Digitalized optical fiber voltage transformer |
| CN104090141A (en) * | 2014-07-03 | 2014-10-08 | 北京瑞奇恩互感器设备有限公司 | Electronic type voltage transformer and zero-sequence electronic type voltage transformer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2496030Y (en) * | 2001-07-31 | 2002-06-19 | 同济大学 | Voltage-current integrated inverter |
| CN101377976A (en) * | 2007-08-29 | 2009-03-04 | 熊江咏 | Electronic voltage transformer |
| CN201319309Y (en) * | 2008-11-27 | 2009-09-30 | 武汉长江光网通信有限责任公司 | Electronic voltage transformer |
| CN201820625U (en) * | 2010-10-14 | 2011-05-04 | 珠海威瀚科技发展有限公司 | Electronic voltage transformer |
-
2011
- 2011-01-26 CN CN 201110028245 patent/CN102163495A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2496030Y (en) * | 2001-07-31 | 2002-06-19 | 同济大学 | Voltage-current integrated inverter |
| CN101377976A (en) * | 2007-08-29 | 2009-03-04 | 熊江咏 | Electronic voltage transformer |
| CN201319309Y (en) * | 2008-11-27 | 2009-09-30 | 武汉长江光网通信有限责任公司 | Electronic voltage transformer |
| CN201820625U (en) * | 2010-10-14 | 2011-05-04 | 珠海威瀚科技发展有限公司 | Electronic voltage transformer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680758A (en) * | 2012-05-14 | 2012-09-19 | 华中科技大学 | Digitalized optical fiber voltage transformer |
| CN104090141A (en) * | 2014-07-03 | 2014-10-08 | 北京瑞奇恩互感器设备有限公司 | Electronic type voltage transformer and zero-sequence electronic type voltage transformer |
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Application publication date: 20110824 |