CN2470838Y - Insulated charged detecting-sampling protector of high-voltage electric equipment - Google Patents
Insulated charged detecting-sampling protector of high-voltage electric equipment Download PDFInfo
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- CN2470838Y CN2470838Y CN 01215418 CN01215418U CN2470838Y CN 2470838 Y CN2470838 Y CN 2470838Y CN 01215418 CN01215418 CN 01215418 CN 01215418 U CN01215418 U CN 01215418U CN 2470838 Y CN2470838 Y CN 2470838Y
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Abstract
The utility model relates to an insulated charged detecting-sampling protector of high-voltage electric equipment. The utility model is characterized in that the utility model is composed of a rectified pressure-limited circuit 1, a gas discharge tube F and a housing 5, wherein the rectified pressure-limited circuit 1 is connected in parallel with the gas discharge tube F, and both ends of the gas discharge tube F are connected in parallel with two sets of connecting terminals 2, 3 which are connected with the housing 5. One set of connecting terminals is connected with signals of detected AC high voltage, the other set of connecting terminals is provided with a movable short circuit board 4 and can be connected with the signal input end of a measurer. The utility model can electrically test in the condition of no power failure and can detect the true condition of equipment insulation in time, and the utility model is widely suitable for live detection of different kinds of capacitive equipment.
Description
The utility model relates to a kind of high voltage electric equipment insulating live testing sampling protector, belongs to high-voltage electrical apparatus checkout equipment technical field.
As everyone knows, the variation of condenser type equipment dielectric loss and electric capacity can reflect the high voltage electric equipment integral body situation of making moist, and make moist and wear out is the main cause of Zinc-Oxide Arrester valve block deterioration, and Zinc-Oxide Arrester leaks total current and current in resistance property can reflect its insulation status (aging performance) effectively by detecting.All belong to little current signal measurement (microampere order or milliampere level) because condenser type equipment dielectric loss and Leakage Current of Zinc-oxide Lightning Arresters are measured, therefore common test pattern is difficult to guarantee necessary measuring accuracy.In order to reach measuring accuracy, adopt the surveying instrument of the built-in structure of sensor usually, the surveying instrument of this structure has stronger anti-electromagnetic interference capability and measurement stability preferably.But directly use the charged detection of this surveying instrument, have sizable danger, therefore for a long time, the insulating monitoring of high voltage electric equipment mainly be on the basis that equipment has a power failure, to carry out conventional preventive trial.But there is following shortcoming:
(1) because preventive trial need have a power failure and carry out, therefore must influence people's production, life and commercial electricity consumption, frequent power failure also can damage consumer and the reliability of influence power supply and the available rate of equipment.
(2) owing to the working voltage of trial voltage well below the test articles for use, the sensitivity of diagnosing insulation defective is lower.
(3) test period long, in time the hidden danger of discovering device and the insulation variation tendency, the recall rate of defective is very low.
(4) the preventive trial workload is big.With the Guangdong Power Grid is example, and many power supply administrations are too tired to deal with annual prediction experiment task, according to statistics, ends to 1999, and Guangdong Province only 110KV current transformer total amount has reached 12605, and voltage transformer (VT) has reached 4389, and the performulation amount is very big.
Along with electric system develops towards high voltage, high capacity direction, how to guarantee that the safe operation of power equipment is just even more important, in case power outage takes place, will bring tremendous influence and loss to production and life.Therefore press for the power equipment running status is carried out in real time or live testing regularly, in time reflect the degradation of equipment,, avoid the generation of power outage so that take preventive measures.
Adopt the surveying instrument of the built-in structure of sensor as aforementioned,, prevent that accidental cause (disconnecting as measuring lead wire) from causing equipment end screen open circuit, should install necessary sampling protected location in the equipment bottom in order to ensure the safety that use at the scene.
The purpose of this utility model is for a kind of high voltage electric equipment insulating live testing sampling protector that is applicable to condenser type equipment is provided.
The purpose of this utility model can reach by taking following measure: high voltage electric equipment insulating live testing sampling protector; its design feature is: be made of rectification pressure limiting loop, gas-discharge tube F and shell; described rectification pressure limiting loop is in parallel with described gas-discharge tube F; the two ends of gas-discharge tube F two groups of splicing ears that connect shell in parallel; wherein one group of splicing ear connects tested ac high-voltage signal, another group link subband movable short board, and can connect the signal input part of measuring instrument.
During actual measurement, disconnect movable short board, the input end of measuring instrument will be connected with the splicing ear of movable short board, on the end screen sleeve pipe of another group splicing ear by multiple twin shielded cable condenser type high-tension apparatus, the heart yearn of multiple twin shielded cable is connected with sleeving core, and shielding line is connected with the screen layer of condenser type high-tension apparatus; The ac high voltage signal is formed the input end that low-voltage dc voltage signal and input measurement are measured by rectification pressure limiting loop rectification and pressure limiting.If tested capacitance apparatus generation open circuit fault causes the overtension of sampling protector input end, gas-discharge tube F will spark, thereby effectively guarantee to comprise the detection site safety of testing staff, equipment under test and detecting instrument etc.
The purpose of this utility model can also reach by taking following measure:
Described rectification pressure limiting loop is in series by 3 to 10 groups of power rectification diode groups.
Each is formed described power rectification diode group by two power rectification diode D reverse parallel connections.
Compared with prior art, the utlity model has following outstanding advantage:
1. need not to have a power failure, test flexibly, conveniently.Can be under situation about not having a power failure live testing, the truth of checkout equipment insulation in time provides enough operation conditions and maintenance informations.
2. measure the working voltage of parameter, diagnostic device insulation defect highly sensitive based on equipment.
3. the test period is easy to arrange flexibly according to apparatus insulated situation, in time the hidden danger of discovering device and insulation variation tendency.
4. can overcome electric capacity protection influences the deficiency that dielectric loss measurement and resistance protection influence capacitance measurement, has the excellent protection characteristic.
5. utilize distributing live testing form that some insulation parameter is detected, not only can and the insulation defect of ground discovering device, and owing to adopt portable instrumentation, have small investment, with strong points, be convenient to the characteristics safeguarding and upgrade.
Below in conjunction with accompanying drawing the utility model is described in detail:
Fig. 1 is a structured flowchart of the present utility model.
Fig. 2 is the electrical schematic diagram of the utility model embodiment 1.
Fig. 3, Fig. 4 are application example connection layout of the present utility model.
Fig. 1, Fig. 2 constitute embodiment 1 of the present utility model.From Fig. 1, Fig. 2 as can be known, present embodiment is made of rectification pressure limiting loop 1, gas-discharge tube F and shell 5, described rectification pressure limiting loop 1 is in parallel with gas-discharge tube F, the two ends of gas-discharge tube F two groups of splicing ears 2,3 that connect shell 5 in parallel, splicing ear 3 connects the positive and negative signal end of tested alternating circuit, splicing ear 2 with movable short board 4, and can connect the input signal end of measuring instrument; Described rectification pressure limiting loop 1 is in series by seven groups of power rectification diode groups 6, and each diode group 6 is formed by the whole urheen pipe D differential concatenation of two power.
As can be seen from Figure 3, during actual measurement, disconnect movable short board 4, with with the I+ of the splicing ear 2 of movable short board 4, the input end that the I-terminal connects measuring instrument, on the M+ of another group splicing ear 3, the end screen sleeve pipe of M-terminal by multiple twin shielded cable condenser type high-tension apparatus, the heart yearn of multiple twin shielded cable is connected with sleeving core, and shielding line is connected with the screen layer of condenser type high-tension apparatus.Measurement finishes, and disconnects surveying instrument, connects movable short board 5.
As can be seen from Figure 4; when in transformer station, carrying out live testing; the utility model SB is sealed between end screen sleeve pipe and the ground; promptly screen electric current in end is gone into ground through behind the utility model; thereby the safety of circuit-under-test and equipment has been protected in the damage of having avoided fault or improper use owing to detecting instrument to cause high-tension circuit and equipment effectively.
Because signal cable and surveying instrument all are under the strong magnetic interference of transformer station's high voltage bus and primary equipment, and the insulation parameter is a kind of weak signal parameter, if do not take perfect interference protection measure, just can't realize measuring accurately.In order to reduce the coupling of electricity dragon and other strong magnetic interferences that corona in the transformer station and spark discharge cause, as shown in Figure 3, sample of signal lead-in wire adopts double core shielding cable, and purpose is to reduce the interlinkage area that disturbs magnetic flux and signal line loop, decays and absorbs electromagnetic undesired signal.In addition, in order to improve the antijamming capability of sensor assembly, adopted built-in multilayer screen to handle.
As can be seen from Figure 2, charged detector adopts punching current transformer sampling mode, and input impedance is extremely low, can directly be serially connected on the equipment under test ground wire to use.If with the direct charged checkout equipment of detector, the high voltage of electrical network and big electric current directly are added in the detector two ends, in case the rating number of detecting instrument is not enough or internal damage, will damages tested high-tension apparatus, jeopardize the electrical equipment that using on the electrical network and people's life security.After inserting the utility model, when generation equipment end screen opens circuit, power rectification two utmost point loop conductings, detecting instrument two ends low-voltage is kept in gas-discharge tube F discharge, and life security that can the underwriter can protect detecting instrument not to be damaged again.
The utility model is widely used in capacitance apparatus and oxidation lightning arresters such as condenser type current transformer, condenser-type terminal, coupling condenser, capacitance type potential transformer.
Embodiment 4 of the present utility model is: series loop 2 is in series by the power rectification diode group of eight groups of reverse parallel connections, and all the other are with embodiment 1.
Claims (3)
1. high voltage electric equipment insulating live testing sampling protector; it is characterized in that: constitute by rectification pressure limiting loop (1), gas-discharge tube F and shell (5); described rectification pressure limiting loop (1) is in parallel with described gas-discharge tube F; two groups of splicing ear (2), (3) that connect shell (5) in parallel, the two ends of gas-discharge tube F; wherein one group of splicing ear connects tested ac high-voltage signal, another group movable short board of link subband (4), and can connect the signal input part of measuring instrument.
2. high voltage electric equipment insulating live testing sampling protector according to claim 1, it is characterized in that: described rectification pressure limiting loop (1) is in series by 3 to 10 groups of power rectification diode groups (6).
3. according to the described high voltage electric equipment insulating live testing sampling of claim protector, it is characterized in that: each is formed described power rectification diode group (6) by two power rectification diode D reverse parallel connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01215418 CN2470838Y (en) | 2001-02-27 | 2001-02-27 | Insulated charged detecting-sampling protector of high-voltage electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01215418 CN2470838Y (en) | 2001-02-27 | 2001-02-27 | Insulated charged detecting-sampling protector of high-voltage electric equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2470838Y true CN2470838Y (en) | 2002-01-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01215418 Expired - Fee Related CN2470838Y (en) | 2001-02-27 | 2001-02-27 | Insulated charged detecting-sampling protector of high-voltage electric equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2470838Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100524999C (en) * | 2006-07-14 | 2009-08-05 | 广州南方电力集团科技发展有限公司 | A power testing sampling protection unit |
| CN111585265A (en) * | 2020-06-03 | 2020-08-25 | 广东电网有限责任公司惠州供电局 | Secondary equipment test power supply safe starting protection device and application |
-
2001
- 2001-02-27 CN CN 01215418 patent/CN2470838Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100524999C (en) * | 2006-07-14 | 2009-08-05 | 广州南方电力集团科技发展有限公司 | A power testing sampling protection unit |
| CN111585265A (en) * | 2020-06-03 | 2020-08-25 | 广东电网有限责任公司惠州供电局 | Secondary equipment test power supply safe starting protection device and application |
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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 |