CN202486268U - Voltage withstand test appliance for over-voltage protector - Google Patents
Voltage withstand test appliance for over-voltage protector Download PDFInfo
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- CN202486268U CN202486268U CN 201120536829 CN201120536829U CN202486268U CN 202486268 U CN202486268 U CN 202486268U CN 201120536829 CN201120536829 CN 201120536829 CN 201120536829 U CN201120536829 U CN 201120536829U CN 202486268 U CN202486268 U CN 202486268U
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Abstract
The utility model provides a voltage withstand test appliance for an over-voltage protector. The voltage withstand test appliance for an over-voltage protector comprises a current protection circuit; the current protection circuit comprises a current-limiting resistor RX1, a diode D and a potentiometer TR, which are connected in series; the potentiometer TR is connected with the control pole of a silicon controlled rectifier KG; the anode of the silicon controlled rectifier KG is connected to the circuit to be detected; the cathode of the silicon controlled rectifier KG is connected to the circuit to be detected through a second intermediate relay ZJ2; and a large capacity contact intermediate relay ZJ1 is also provided, and the normally closed contact is in series connection with the control circuit of a power supply control contactor KM. According to the utility model, once the over-voltage protector is discharged, the test power supply is cut off, human observation on a milliammeter is unnecessary, and the test equipment and the test personal are protected. Simultaneously, the motion of the over-voltage protector can be visually displayed on a discharge counter, and the problem in the previous over-voltage protector that whether motion is insufficient cannot be determined is solved. In addition, the test data is more real and effective.
Description
Technical field
The utility model relates to the electrical apparatus test device, is specifically related to a kind of high pressure overvoltage protection device Withstand test device.
Background technology
High pressure overvoltage protector power-frequency sparkover voltage value is to weigh one of its most important technical indicator of overvoltage protector, but the relevant rules of country do not provide the test method and the basis for estimation of overvoltage protection device gap power-frequency discharge.
In engineering in the past; Overvoltage protection device is done the handing-over power frequency withstand test before putting into operation; The following two kinds of conventional test methods of main employing: the one, gapless overvoltage protector adopts high direct voltage to sew appearance; Measure the critical operation voltage peak value under the 1mA DC current through reaching between " relatively " between " phase relatively ", as the withstand voltage test value of overvoltage protection device.The 2nd, gapped overvoltage protector adopts the AC voltage withstand test appearance, and through observing in the high-potting, the electric current increase situation that the mA that seals in of institute shows is judged; Because overvoltage protection device boosts in the process doing withstand voltage test; The current values before the discharge is not smaller, increase severely when observing the reometer reading, or the voltage table reading falls suddenly; Just think that overvoltage protection device begins discharge this moment, the numerical value before voltage table falls suddenly is the withstand voltage test value of overvoltage protection device; This test method, the test period that is spent is longer, the data accuracy rate of test gained lower (sudden change that comes observation post to seal in the mA table by the people comes anti-judgement).Testing equipment and personal safety can not guarantee (the long-time energising of testing equipment is not tripped) fully.Under tight situation of duration of a project and be not suitable for.Can find out referring to Fig. 1; Though in the control loop of the former limit of pressure regulator, be connected in series overcurrent relay GL, through facts have proved, in withstand voltage test; The electric current on the former limit of pressure regulator flow through when beginning to discharge because smaller, not enough so that protection GL overcurrent relay action message; When the overvoltage protection device discharge breakdown moved, the GL overcurrent relay just can move, and began to discharge breakdown one intersegmental having a rest arranged from discharge.During this period of time; Still exist owing to be applied to the voltage on the former limit of step-up transformer, and the secondary winding because being similar to short circuit, discharge can produce bigger electric current on the secondary high pressure winding of testing transformer; If the overlong time that this electric current exists constitutes fatal threat to equipment; Most of overvoltage protection devices all are being strict with excision high-potting power supply in very short time in order to increase the service life after the discharge simultaneously.
And testing transformer does not have the overvoltage protection relay among the former test connection figure, the discharge off counter.Based on this, must the butted line circuit and testing equipment improve, make a control operation case, could testing equipment and tested device and debugging operations personnel's life safety be obtained effectively, reliable protection.
The utility model content
To the above-mentioned deficiency that prior art exists, it is a kind of safe, reliable that the purpose of the utility model is to provide, a kind of accurately high pressure overvoltage protection device of test data Withstand test device.
The technical scheme that the utility model adopts is: a kind of high pressure overvoltage protection device Withstand test device, it is characterized in that, and comprise current protecting circuit; Said current protecting circuit comprises current-limiting resistance RX1, diode D and pot TR; Said current-limiting resistance RX1, diode D, pot TR connect successively, and pot TR extremely links to each other with the control of controllable silicon KG; The positive pole of controllable silicon KG inserts circuit-under-test, and the negative pole of controllable silicon KG inserts circuit-under-test through second intermediate relay ZJ 2; Also be provided with high capacity contact intermediate relay ZJ 1, its normally closed contact is connected in the control circuit of power supply control contactor KM.
Compare prior art, the utlity model has following advantage:
Adopt the utility model to test, overvoltage protection device is discharge in a single day, and experiment power supply is cut off immediately, and having avoided the people is the situation of observing the milliammeter action, effectively protection test equipment and test personal safety.Simultaneously, the action situation that can show overvoltage protection device on the discharge counter intuitively is set, has so just avoided overvoltage protection device in the past not know in test the deficiency of whether moving.And test figure is true more, effective.
Can be according to the subjects of different model, different size, the test protection parameter value of adjusting different can not burn testing equipment because of superpotential.
Description of drawings
Fig. 1 is existing overvoltage protection device test control principle figure;
Fig. 2 is the utility model overvoltage protection device test control principle figure.
Embodiment
Referring to Fig. 2, a kind of high pressure overvoltage protection device Withstand test device is used for lightning arrester is carried out the test of high pressure overvoltage protection.Withstand test device comprises electron discharge counter, overvoltage relay GY and current protecting circuit; Said current protecting circuit comprises current-limiting resistance RX1, diode D and pot TR; Said current-limiting resistance RX1, diode D, pot TR connect successively, and pot TR extremely links to each other with the control of controllable silicon KG; The positive pole of controllable silicon KG inserts circuit-under-test, and the negative pole of controllable silicon KG inserts circuit-under-test through second intermediate relay ZJ 2; Also be provided with high capacity contact intermediate relay ZJ 1, its normally closed contact is connected in the control circuit of power supply control contactor KM.
Among the figure, be the operation control box wiring diagram in the frame of broken lines, be in the strokes and dots wire frame lightning arrester synoptic diagram (wherein FR, BK, CG are that lightning arrester is formed member, and not have essence technological related with the utility model test instrument); SY is the pressure build-up test transformer, and RF is a high-voltage bleeder, and RX2 is the high pressure current-limiting resistor voltage divider, and MA is the high pressure milliammeter; QF1 is a mechanical switch, and RD1, RD2 are fuse, and BD is a pilot lamp, and L is a phase line; N is the neutral line, and LD is a pilot lamp, and TA, OA are pushbutton switch, and GY is an overvoltage relay; HD is that pilot lamp, LH are choking coil, and RX1 is that current-limiting resistance, RX2 are the high pressure current-limiting resistor voltage divider, and TY is the centre tap variable inductor.
The principle of work of the utility model test instrument is: after the overvoltage protection device discharge; The electric current of the secondary of current transformer induction, earlier through current-limiting resistance RX1, pass through diode D rectification again after; Its DC voltage passes through pot TR once more; The control that is added to controllable silicon KG is extremely gone up, and makes forward voltage of connection of controllable silicon KG, thereby makes controllable silicon conducting immediately.Make after the controllable silicon conducting intermediate relay ZJ 2 electric adhesive, high capacity contact intermediate relay ZJ 1 also electric adhesive, owing to the normally closed contact of ZJ1 is connected in the control circuit of power supply control contactor KM.Therefore, overvoltage protection device is discharge in a single day, and experiment power supply is cut off immediately.Testing transformer can not burnt because of long-time energising after discharge, and commissioning staff and testing transformer also are effectively protected.Through changing the size of pot TR, the size of scalable silicon controlled trigger current has changed the time of controllable silicon conducting immediately, thereby has changed the morning and evening of cutting off trial voltage.Therefore change pot TR, can change the withstand voltage test grade of overvoltage protection device.
Claims (1)
1. a high pressure overvoltage protection device Withstand test device is characterized in that, comprises current protecting circuit; Said current protecting circuit comprises current-limiting resistance (RX1), diode (D) and pot (TR); Said current-limiting resistance (RX1), diode (D), pot (TR) are connected successively, and pot (TR) extremely links to each other with the control of controllable silicon (KG); The positive pole of controllable silicon (KG) inserts circuit-under-test, and the negative pole of controllable silicon (KG) inserts circuit-under-test through second auxiliary reclay (ZJ2); Also be provided with high capacity contact auxiliary reclay (ZJ1), its normally closed contact is connected in the control circuit of power supply control contactor (KM).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120536829 CN202486268U (en) | 2011-12-20 | 2011-12-20 | Voltage withstand test appliance for over-voltage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120536829 CN202486268U (en) | 2011-12-20 | 2011-12-20 | Voltage withstand test appliance for over-voltage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202486268U true CN202486268U (en) | 2012-10-10 |
Family
ID=46960682
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120536829 Expired - Fee Related CN202486268U (en) | 2011-12-20 | 2011-12-20 | Voltage withstand test appliance for over-voltage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202486268U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052020A (en) * | 2014-06-12 | 2014-09-17 | 王新强 | Default phase, zero missing, null line breaking and short circuiting protecting device in low-voltage power supply system |
-
2011
- 2011-12-20 CN CN 201120536829 patent/CN202486268U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052020A (en) * | 2014-06-12 | 2014-09-17 | 王新强 | Default phase, zero missing, null line breaking and short circuiting protecting device in low-voltage power supply system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121010 Termination date: 20141220 |
|
| EXPY | Termination of patent right or utility model |