CN2082908U - Secondary circuit disconnection protective device of current transformer - Google Patents
Secondary circuit disconnection protective device of current transformer Download PDFInfo
- Publication number
- CN2082908U CN2082908U CN 91203441 CN91203441U CN2082908U CN 2082908 U CN2082908 U CN 2082908U CN 91203441 CN91203441 CN 91203441 CN 91203441 U CN91203441 U CN 91203441U CN 2082908 U CN2082908 U CN 2082908U
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- CN
- China
- Prior art keywords
- winding
- current transformer
- circuit
- short circuit
- protection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model belongs to a secondary circuit disconnection protective device of a current transformer. Between two groups of four rectifying diodes connected in parallel, a zinc oxide voltage sensitive resistor and the winding of a protective relay are connected in series to compose a return circuit, and the protective device comprises two double-position mechanical self-locking windings with the functions of short circuit and latching. The utility model is used for the winding of the differential protective current transformer, the secondary winding at one side is connected in the short circuit, and simultaneously the secondary winding at the opposite side is connected in the short circuit to reach the function of latching and differential protection. The protection device reaches the purposes of no shutdown and no power off when a disconnection fault happens.
Description
The utility model belongs to break alarm, the protective device of secondary loop of mutual inductor.
Usually in using electricity system; in case during secondary loop of mutual inductor generation disconnection fault; the high-tension electricity of several ten thousand volts will be produced; cause the damage and the human casualty accident of secondary device; even more serious is that destruction transmission of electricity networking and generator are normally moved; very big to the national economy influence, domestic report and the use of not seeing about this class protective device.
Introducing on the external 300,000 kilowatt of motors, a kind of nonlinear resistor valve sheet current transformer protector is housed.In case this valve block resistance heating is to a certain degree behind the generation disconnection fault, make the bimetal leaf junction closure of installing below the valve block, and the short circuit secondary loop of mutual inductor obtains breaking protection.Alarm free and blocking function.
The purpose of this utility model is to select for use the response speed to voltage can reach the Zinc-oxide piezoresistor of nanosecond order of magnitude as primary element; make broken wire protecting equipment; when external system is short-circuited; because selected piezo-resistance mark calculation value is far below open circuit voltage; make piezo-resistance be low resistive state; the secondary loop of mutual inductor short circuit is suppressed at open circuit voltage below the permission voltage, and obtains the purpose of break alarm and protection.
To the protection of the secondary load of current transformer in conjunction with the accompanying drawings 1, the utility model is to realize like this.At D
1, D
2With D
3, D
4Insert the winding of Zinc-oxide piezoresistor Ry and protection relay between four rectification diodes of two groups of parallel connections
Be in series and constitute the loop.D
5Be the energy dissipating circuit.Protection relay has two windings by the two-position mechanical self-latching type
For the action winding, link to each other with four normal opened contacts, wherein two contacts link to each other with the short circuit current transformer secondary circuit, and another contact is connected with sound, visual alarm loop.Winding
Be relay involution coil, be connected on by involution button FA open in usual on the power supply of any electric pressure of outside 24～220V.Also has a contact as standby.
After pressing said apparatus access load, when secondary loop of mutual inductor generation disconnection fault, the high voltage of generation is through four rectifier diode D
1～D
4Put on piezo-resistance Ry and winding
On, when the mark that this broken string high voltage surpasses piezo-resistance Ry was calculated magnitude of voltage, piezo-resistance Ry was low resistive state and conducting makes winding
Start, drive that to sail four normal opened contacts all closed in＜15ms, secondary loop of mutual inductor is short circuit immediately, reaches the high-tension effect of inhibition.Sound, visual alarm send warning simultaneously.D
5For the energy dissipating circuit, work as winding
Start and transfer loss of excitation moment to and will produce reverse high voltage, can utilize D
5Constitute the loop, and absorb electric energy, reach and prevent reverse high resistance and damage winding
Owing to adopted mechanical self-latching type, promptly had the locking action of docking point.After outside disconnection fault is got rid of, as long as press involution button FA, winding
Could remove the short circuit of secondary loop of mutual inductor, recover normally operation.
Secondary loop of mutual inductor broken wire protecting equipment for the generator differential circuit; should have breaking protection and breakage lock device function; promptly when reaching the secondary loop of mutual inductor generation disconnection fault that differential protection loop connected of high-rating generator, do not accomplish not shutting down and handle disconnection fault under the power-off condition.As shown in Figure 2; adopt two elementary cell protection relays (DXJ) shown in Figure 1; externally during circuit connection; the current transformer of differential protection both sides all need insert the breaking protection relay; insert the secondary loop of mutual inductor of this side at two of the protection relays of this side and interface, another contact inserts the secondary loop of mutual inductor of differential protection offside.Fig. 2 is at winding
On also be provided with the energy dissipating circuit, mark for simplicity and not.
By circuit protection device shown in Figure 2; when any side generation disconnection fault of the both sides of differential protection secondary loop of mutual inductor; the contact of breaking protection relay; at 15ms with interior action with this side secondary loop of mutual inductor short circuit; to reach the inhibition high voltage, the protection secondary device exempts from damage.When any side generation disconnection fault of the both sides of differential protection secondary loop of mutual inductor; the contact of breaking protection moves in 15ms; in the time of on the one hand with this side secondary loop of mutual inductor short circuit; secondary loop of mutual inductor that also must short circuit offside (non-disconnection fault side); so not only play and suppress the high-tension protective effect of open circuit, can also play the function of Blocking Differential Protection.
Fig. 3 has specifically provided the allocation plan of protective device and generator and load.
This protective device of Fig. 4 configuration schematic diagram in the terminal board case.
Fig. 5～shown in Figure 8 is by 10～100% generator loading current recording figure.Can obviously see on scheming, relay normally closed contact opening time be all less than 15ms.Thereby reach the purpose of break alarm, locking and protection, can accomplish and not shut down, do not have a power failure, in time handle disconnection fault.
Can find out that also the voltage during disconnection fault all is suppressed from record ripple figure below 600V, the inhibition voltage after contact and action is then very low especially.
Embodiment:with 200,000 kilowatt of heavy-duty generators is example, has 24 secondary winding in current transformer and needs protection.These 24 windings are respectively applied for various measuring instruments, overcurrent loss of excitation and differential protection etc., and its primary circuit configuration is arranged as accompanying drawing 3 and shown in Figure 4 with relay.Wherein 6 windings are that differential protection carries out distribution by Fig. 2, and other 18 windings carry out distribution by Fig. 1.
Piezo-resistance is selected MY31-510/S type piezo-resistance, nominal voltage 510V.Rectifier diode 1N5406 type rectifier diode, relay machinery dibit self-latching relay.Have four normal opened contacts, direct voltage can be selected 48V, 110V or 220V etc. and all can.
Press said apparatus, be installed in the using electricity system, can reach warning, protection and blocking function when in 15ms, accomplishing the secondary loop of mutual inductor broken string.
Claims (1)
1, a kind of secondary loop of mutual inductor broken wire protecting equipment is characterized in that at D
1, D
2With D
3, D
4Insert piezo-resistance R between two groups of four rectifier diodes in parallel
y, with the winding of protection relay
Be in series and constitute loop, D
5Be the energy dissipating circuit, protection relay has two windings by the two-position mechanical self-latching type
For the action winding links to each other with four normal opened contacts, wherein two contacts link to each other with the short circuit current transformer secondary circuit, and another contact links to each other winding with sound, visual alarm loop
Be relay involution coil, be connected on by involution button FA open in usual on the power supply of any electric pressure of outside 24～220V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91203441 CN2082908U (en) | 1991-03-07 | 1991-03-07 | Secondary circuit disconnection protective device of current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91203441 CN2082908U (en) | 1991-03-07 | 1991-03-07 | Secondary circuit disconnection protective device of current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2082908U true CN2082908U (en) | 1991-08-14 |
Family
ID=4913758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91203441 Withdrawn CN2082908U (en) | 1991-03-07 | 1991-03-07 | Secondary circuit disconnection protective device of current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2082908U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280769A (en) * | 2013-05-24 | 2013-09-04 | 国家电网公司 | Current transformer open circuit prevention protection device |
| CN103399253A (en) * | 2013-08-20 | 2013-11-20 | 国家电网公司 | Device for detecting circuit opening of secondary circuit of current transformer |
| CN105092940A (en) * | 2015-07-07 | 2015-11-25 | 国网上海市电力公司 | Alarming device for the electrification of a current transformer secondary circuit |
| CN105790215A (en) * | 2016-03-02 | 2016-07-20 | 闫堂锁 | CT open-circuit protection device |
| CN106684820A (en) * | 2016-11-09 | 2017-05-17 | 国网天津市电力公司 | Open circuit automatic protection device for secondary circuit of high voltage current transformer |
-
1991
- 1991-03-07 CN CN 91203441 patent/CN2082908U/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280769A (en) * | 2013-05-24 | 2013-09-04 | 国家电网公司 | Current transformer open circuit prevention protection device |
| CN103399253A (en) * | 2013-08-20 | 2013-11-20 | 国家电网公司 | Device for detecting circuit opening of secondary circuit of current transformer |
| CN103399253B (en) * | 2013-08-20 | 2015-10-21 | 国家电网公司 | A kind of open circuit of secondary loop of current transformer pick-up unit |
| CN105092940A (en) * | 2015-07-07 | 2015-11-25 | 国网上海市电力公司 | Alarming device for the electrification of a current transformer secondary circuit |
| CN105092940B (en) * | 2015-07-07 | 2018-09-28 | 国网上海市电力公司 | A kind of secondary loop of mutual inductor electrification alarming device |
| CN105790215A (en) * | 2016-03-02 | 2016-07-20 | 闫堂锁 | CT open-circuit protection device |
| CN105790215B (en) * | 2016-03-02 | 2018-03-09 | 闫堂锁 | CT open-circuit protecting devices |
| CN106684820A (en) * | 2016-11-09 | 2017-05-17 | 国网天津市电力公司 | Open circuit automatic protection device for secondary circuit of high voltage current transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| 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 |