CN2458710Y - Capacitance voltage transformer for neutral-point non-productive earthing system - Google Patents
Capacitance voltage transformer for neutral-point non-productive earthing system Download PDFInfo
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- CN2458710Y CN2458710Y CN 00266153 CN00266153U CN2458710Y CN 2458710 Y CN2458710 Y CN 2458710Y CN 00266153 CN00266153 CN 00266153 CN 00266153 U CN00266153 U CN 00266153U CN 2458710 Y CN2458710 Y CN 2458710Y
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Abstract
The utility model relates to a capacitance voltage transformer for a neutral point non-effective grounding system, which belongs to the field of high voltage electrical appliances. The utility model can be used for detecting voltage between phases in the neutral point non-effective grounding systems of 6kV, 10kV and 35kV. An electromagnetic unit of the capacitance voltage transformer of the utility model is bridged on a voltage division tap of two capacitance voltage dividers arranged between a measured phase and the ground. Two independent capacitance voltage transformers of the utility model are used by a three-phase group to form a V shape. The utility model is particularly suitable for being used as a voltage sensor in power supply system which has small signal load and is controlled by a microcomputer.
Description
This patent relates to a kind of capacitance type potential transformer that is used for system with non effectively earth ed neutral.Belong to the High-Voltage Electrical Appliances field.
This capacitance type potential transformer is made up of capacitor voltage divider and electromagnetic unit.Capacitor voltage divider is received between the phase and ground, and electromagnetic unit is obtained primary voltage from the tapping of capacitor voltage divider, and the pressure transformer conversion obtains for the secondary voltage of measuring and protect usefulness in the process.
IEC-186 and GB4703 mention this capacitance type potential transformer.It is used for 110kV and above system with effectively earthed neutral is measured phase-to-ground voltage, and secondary voltage is 110V/ √ 3 and 100V.Its voltage-dividing capacitor C
1, C
2Form by-Jie or more piece coupling capacitor, middle pressure usually at 10kV between the 20kV.Electromagnetic unit is connected between tapping and the ground, mainly is made up of compensation reactor L, middle pressure transformer T and damper Z.Reactor is used for the capacitive reactances of building-out capacitor voltage divider, improves the secondary load characteristic.Middle pressure transformer is used for step-down.Damper is used to suppress ferro resonance.Electrical structure as shown in Figure 1.In order to eliminate the resonance hidden danger of electromagnetic potential transformer in 10kV and the 35kV electric power system, in recent years, the capacitance type potential transformer of these two kinds of electric pressures is existing to be used.
The capacitance type potential transformer of above structure is not suitable for using in system with non effectively earth ed neutral.Main cause has 2 points: the one, during system with non effectively earth ed neutral generation single phase ground fault, the voltage of fault-free phase will be elevated to 1.7 times of rated voltage, have only specially designed electromagnetic unit normally to use under this operating mode, this can increase cost undoubtedly; The 2nd, in this three-phase system, general only the need uses two electromagnetic potential transformers to stride the forming V-shape that joins, and traditional capacitance type potential transformer must use three, primary side connects by neutral point effective grounding mode, secondary side is by the neutral non-effective grounding mode and consider that the polar relationship that secondary ground connection will be satisfied carries out V-arrangement connection, wiring complexity.
The purpose of this patent is a kind of capacitance type potential transformer that is used for system with non effectively earth ed neutral of exploitation, can be used in 6kV, 10kV, the 35kV system with non effectively earth ed neutral and measures voltage between phases.
The electromagnetic unit of this capacitance type potential transformer adopts the mode of being connected of striding.Two capacitor voltage dividers are received respectively between the measured phase and ground, and electromagnetic unit is connected across on the tapping of two capacitor voltage dividers, obtains middle pressure.Electrical structure as shown in Figure 2.
This patent has adopted electromagnetic unit to stride the phase connection, need not carry out V-arrangement at secondary and connect.When single phase ground fault, can make the voltage that bears on the electromagnetic unit constant substantially.The employing this patent can reduce the requirement of withstand voltage of electromagnetic unit, the fail safe that improves electric power system.
Use two such capacitance type potential transformers of Fig. 2 to press V-arrangement and connect, can be connected into the three-phase group, replace earth-free electromagnetic potential transformer to use at system with non effectively earth ed neutral.As shown in Figure 3.
Adopt the capacitance type potential transformer that is used for system with non effectively earth ed neutral of this patent manufacturing, be particularly suitable in signal load very little micro-processor controlled 6kv, 10kV, 35kV electric power system, doing voltage sensor and use.It is lower than electromagnetic potential transformer cost, and volume is little, and is in light weight, and it is little to consume energy, not resonance.
Claims (1)
- A kind of capacitance type potential transformer that is used for system with non effectively earth ed neutral, it is made up of with the electromagnetic unit that contains compensation reactor, middle pressure transformer, damper the capacitor voltage divider that is connected between the phase and ground, it is characterized by: electromagnetic unit is connected across on the tapping of two capacitor voltage dividers between the measured phase and ground, and the three-phase group uses the independently capacitance type potential transformer of two this structures to be connected into V-arrangement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00266153 CN2458710Y (en) | 2000-12-29 | 2000-12-29 | Capacitance voltage transformer for neutral-point non-productive earthing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00266153 CN2458710Y (en) | 2000-12-29 | 2000-12-29 | Capacitance voltage transformer for neutral-point non-productive earthing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2458710Y true CN2458710Y (en) | 2001-11-07 |
Family
ID=33620300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00266153 Expired - Fee Related CN2458710Y (en) | 2000-12-29 | 2000-12-29 | Capacitance voltage transformer for neutral-point non-productive earthing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2458710Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101640124A (en) * | 2009-07-24 | 2010-02-03 | 江苏通驰自动化系统有限公司 | Suspended capacitor voltage transformer |
| CN110836994A (en) * | 2018-08-15 | 2020-02-25 | 大连北方互感器集团有限公司 | All-insulation type capacitor voltage transformer |
-
2000
- 2000-12-29 CN CN 00266153 patent/CN2458710Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101640124A (en) * | 2009-07-24 | 2010-02-03 | 江苏通驰自动化系统有限公司 | Suspended capacitor voltage transformer |
| CN101640124B (en) * | 2009-07-24 | 2012-09-05 | 江苏通驰自动化系统有限公司 | Suspended capacitor voltage transformer |
| CN110836994A (en) * | 2018-08-15 | 2020-02-25 | 大连北方互感器集团有限公司 | All-insulation type capacitor voltage transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |