CN203774746U - Mobile line protection device - Google Patents
Mobile line protection device Download PDFInfo
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- CN203774746U CN203774746U CN201420194736.2U CN201420194736U CN203774746U CN 203774746 U CN203774746 U CN 203774746U CN 201420194736 U CN201420194736 U CN 201420194736U CN 203774746 U CN203774746 U CN 203774746U
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- tripping
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- closing
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- 230000001681 protective effect Effects 0.000 claims description 33
- 230000000903 blocking effect Effects 0.000 claims description 9
- 229920000742 Cotton Polymers 0.000 claims description 5
- 230000003139 buffering effect Effects 0.000 claims description 5
- 239000002184 metal Substances 0.000 abstract description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000192 social effect Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
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Abstract
The utility model, which relates to the high-voltage line protection field, provides a mobile line protection device. When a line protection fault occurs at a transformer substation with no bypass wiring, the power supply reliability and the people's normal lives are influenced because the protection unit can not work normally and the line outage time is long; however, with the device, the problem can be solved. A box body is formed by enclosing of metal; and the performances of solidness and durability and small size are realized. Current and voltage outgoing lines of a terminal strip are formed by flexible wires with pins; and tripping and closing wires are formed by using aviation plugs. The protection circuit is fixed in the box body and the terminal strip is fixed at the back of the box body; the protection circuit and the pedestal terminal strip are processed by wiring; and the alternating-current wire, the alternating current wire, the direct-current power line, and a tripping and closing wire and the like are led out from the terminal strip, so that the device has the same protection tripping function as the fault protection. The provided device is suitable for high-voltage line protection.
Description
Technical field
The utility model relates to high-voltage line protection field.
Background technology
In China, for high-tension line, never allow the operation of circuit unprotect, and route protection is all single cover protection in China 110kV and following system, for the transformer station with bypass connection not, in the time that the faults such as emerged in operation route protection cause protection normally to work, must exit protection, circuit simultaneously that must stop transport and protect, wait for that relay protection personnel process, but current because each electric company power supply area is increasing, jurisdiction transformer station is more and more, the model of protection is also varied, if every kind of model protection is all for subsequent use a set of, cost is very large, this is all difficult to realize in a lot of electric companies, send out spare part if contact again producer after protection fault, this wherein can delay again several days time, cause the line outage time to lengthen, this has just affected power supply reliability, the economic benefit of Ye Shi power supply enterprise self suffers a loss simultaneously.
Utility model content
The utility model is in order to solve when route protection fault does not appear in the transformer station with bypass connection; because protection cannot normally be worked long with the line outage time; thereby affect the problem of power supply reliability and people's normal life, proposed portable line protective devices.
Portable line protective devices comprise casing, terminal board, pressing plate and protective circuit; a side of casing is panel; described terminal board and pressing plate are installed on the panel of casing; protective circuit is fixed on the inside of casing; described protective circuit comprises electric current and voltage loop, exit plate and operation circuit
Described operation circuit comprises the first tripping position relay TWJ1, the second tripping position relay TWJ2, the 3rd tripping position relay TWJ3, combined floodgate latching relay HBJ, voltage-type trip-proof lockout relay TBJV, closing contactor HC, closing relay HJ, closing pressure blocking relay HYJ, tripping operation latching relay TBJ, close rear position relay KKJ, tripping operation pressure atresia relay TYJ, breaking coil TQ, tripping operation indicator light LD, combined floodgate indicator light HD, the first closing operation position relay HWJ1, the second closing operation position relay HWJ2, the 3rd closing operation position relay HWJ3, tripping relay TJ, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the first diode D1, the second diode D2, the 3rd diode D3, the first switch S 1, second switch S2 and the 3rd switch S 3,
After the normally opened contact parallel connection of the normally opened contact of the first tripping position relay TWJ1, the normally opened contact of the second tripping position relay TWJ2 and the 3rd tripping position relay TWJ3, be connected in the current supply circuit of tripping operation indicator light LD,
The coil of the coil of the first tripping position relay TWJ1, the coil of the second tripping position relay TWJ2, the 3rd tripping position relay TWJ3 and the first resistance R 1 are connected between link 1nB13 and positive source bus 1nB01, described link 1nB13 is connected with link 1nB11
After the first normally opened contact of combined floodgate latching relay HBJ and the second normally opened contact parallel connection, and the normally-closed contact of voltage-type trip-proof lockout relay TBJV, coil, the normally-closed contact of link 1nB11, closing contactor HC and the control coil of closing contactor HC of combined floodgate latching relay HBJ be connected between positive source bus 1nB01 and power cathode bus 1nB09
Normally-closed contact and the first switch S 1 of described voltage-type trip-proof lockout relay TBJV are connected in parallel,
The normally opened contact of closing relay HJ and brace 1LP2 are connected between positive source bus 1nB01 and link 1nB18,
The anodic bonding of link 1nB18 and the second diode D2, the negative electrode of link 1nB12 the second diode D2 connects,
After the first normally-closed contact HYJ1 of second switch S2, closing pressure blocking relay HYJ and the second normally-closed contact HYJ2 of closing pressure blocking relay HYJ are connected in parallel, and the 3rd diode D3 be connected between link 1nB18 and link 1nB12, wherein the anode of the 3rd diode D3 is connected with link 1nB12
After the normally opened contact of tripping operation latching relay TBJ and the normally opened contact of voltage-type trip-proof lockout relay TBJV are connected in parallel, and coil and the second resistance R 2 of voltage-type trip-proof lockout relay TBJV be connected between link 1nB12 and power cathode bus 1nB09
Actuation coil and the 3rd resistance R 3 of closing rear position relay KKJ are connected between link 1nB12 and power cathode bus 1nB09,
Resetting coil and the 4th resistance R 4 of closing rear position relay KKJ are connected between link 1nB14 and power cathode bus 1nB09,
The anode of the first diode D1 is connected with link 1nB14, and the negative electrode of the first diode D1 is connected with link 1nB16,
After the second normally-closed contact TYJ2 of the first normally-closed contact TYJ1 of the 3rd switch S 3, tripping operation pressure atresia relay TYJ and tripping operation pressure atresia relay TYJ is connected in parallel, be connected between link 1nB16 and positive source bus 1nB01 with the normally opened contact of the latching relay TBJ that trips
After the second normally-closed contact TYJ2 of the first normally-closed contact TYJ1 of the 3rd switch S 3, tripping operation pressure atresia relay TYJ and tripping operation pressure atresia relay TYJ is connected in parallel, be connected between link 1nB16 and link 1nB17 with the coil of the latching relay TBJ that trips
The normally opened contact of tripping relay TJ and brace 1LP1 are connected between positive source bus 1nB01 and link 1nB16,
The control coil of the normally opened contact of breaking coil TQ and breaking coil TQ is connected between link 1nB17 and power cathode bus 1nB09,
The coil of the coil of the first closing operation position relay HWJ1, the coil of the second closing operation position relay HWJ2, the 3rd closing operation position relay HWJ3 and the 5th resistance R 5 are connected between link 1nB15 and positive source bus 1nB01,
After the normally opened contact parallel connection of the normally opened contact of the first closing operation position relay HWJ1, the normally opened contact of the second closing operation position relay HWJ2, the 3rd closing operation position relay HWJ3, be connected in the current supply circuit of combined floodgate indicator light HD.
Beneficial effect: the utility model exploitation is simple; with low cost; protective circuit is fixed in a casing; and arrange at casing back fixed terminal; protective circuit and base terminal board are carried out to distribution; then draw alternating current streamline, alternating current line ball, direct current supply line, breaker tripping and closing line etc. from terminal board, make it possess the trip protection function identical with error protection.
The utility model is easy to use, quickness and high efficiency, is easy to carry, and installs simply, and breaker tripping and closing line adopts special aviation plug interface, installs fast; Can be rapidly substitute the out of order circuit of protective device temporarily, for relaying protection personnel handling failure has won the sufficient time, and, can reduce the interruption duration of circuit, increase power supply reliability.
Brief description of the drawings
Fig. 1 is the electrical schematic diagram of the operation circuit described in embodiment one;
Fig. 2 is the connection table of the terminal board described in embodiment one;
Fig. 3 is the electrical schematic diagram of the exit plate described in embodiment one;
Fig. 4 is the schematic diagram in the electric current and voltage loop described in embodiment one;
Fig. 5 is the wiring schematic diagram of the pressing plate described in embodiment one;
Fig. 6 is the structural representation of casing.
Embodiment
Embodiment one, in conjunction with Fig. 1-Fig. 5, this embodiment is described; portable line protective devices described in this embodiment comprise casing, terminal board, pressing plate and protective circuit; a side of casing is panel; described terminal board and pressing plate are installed on the panel of casing; protective circuit is fixed on the inside of casing; described protective circuit comprises electric current and voltage loop, exit plate and operation circuit
Described operation circuit comprises the first tripping position relay TWJ1, the second tripping position relay TWJ2, the 3rd tripping position relay TWJ3, combined floodgate latching relay HBJ, voltage-type trip-proof lockout relay TBJV, closing contactor HC, closing relay HJ, closing pressure blocking relay HYJ, tripping operation latching relay TBJ, close rear position relay KKJ, tripping operation pressure atresia relay TYJ, breaking coil TQ, tripping operation indicator light LD, combined floodgate indicator light HD, the first closing operation position relay HWJ1, the second closing operation position relay HWJ2, the 3rd closing operation position relay HWJ3, tripping relay TJ, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the first diode D1, the second diode D2, the 3rd diode D3, the first switch S 1, second switch S2 and the 3rd switch S 3,
After the normally opened contact parallel connection of the normally opened contact of the first tripping position relay TWJ1, the normally opened contact of the second tripping position relay TWJ2 and the 3rd tripping position relay TWJ3, be connected in the current supply circuit of tripping operation indicator light LD,
The coil of the coil of the first tripping position relay TWJ1, the coil of the second tripping position relay TWJ2, the 3rd tripping position relay TWJ3 and the first resistance R 1 are connected between link 1nB13 and positive source bus 1nB01, described link 1nB13 is connected with link 1nB11
After the first normally opened contact of combined floodgate latching relay HBJ and the second normally opened contact parallel connection, and the normally-closed contact of voltage-type trip-proof lockout relay TBJV, coil, the normally-closed contact of link 1nB11, closing contactor HC and the control coil of closing contactor HC of combined floodgate latching relay HBJ be connected between positive source bus 1nB01 and power cathode bus 1nB09
Normally-closed contact and the first switch S 1 of described voltage-type trip-proof lockout relay TBJV are connected in parallel,
The normally opened contact of closing relay HJ and brace 1LP2 are connected between positive source bus 1nB01 and link 1nB18,
The anodic bonding of link 1nB18 and the second diode D2, the negative electrode of link 1nB12 the second diode D2 connects,
After the first normally-closed contact HYJ1 of second switch S2, closing pressure blocking relay HYJ and the second normally-closed contact HYJ2 of closing pressure blocking relay HYJ are connected in parallel, and the 3rd diode D3 be connected between link 1nB18 and link 1nB12, wherein the anode of the 3rd diode D3 is connected with link 1nB12
After the normally opened contact of tripping operation latching relay TBJ and the normally opened contact of voltage-type trip-proof lockout relay TBJV are connected in parallel, and coil and the second resistance R 2 of voltage-type trip-proof lockout relay TBJV be connected between link 1nB12 and power cathode bus 1nB09
Actuation coil and the 3rd resistance R 3 of closing rear position relay KKJ are connected between link 1nB12 and power cathode bus 1nB09,
Resetting coil and the 4th resistance R 4 of closing rear position relay KKJ are connected between link 1nB14 and power cathode bus 1nB09,
The anode of the first diode D1 is connected with link 1nB14, and the negative electrode of the first diode D1 is connected with link 1nB16,
After the second normally-closed contact TYJ2 of the first normally-closed contact TYJ1 of the 3rd switch S 3, tripping operation pressure atresia relay TYJ and tripping operation pressure atresia relay TYJ is connected in parallel, be connected between link 1nB16 and positive source bus 1nB01 with the normally opened contact of the latching relay TBJ that trips
After the second normally-closed contact TYJ2 of the first normally-closed contact TYJ1 of the 3rd switch S 3, tripping operation pressure atresia relay TYJ and tripping operation pressure atresia relay TYJ is connected in parallel, be connected between link 1nB16 and link 1nB17 with the coil of the latching relay TBJ that trips
The normally opened contact of tripping relay TJ and brace 1LP1 are connected between positive source bus 1nB01 and link 1nB16,
The control coil of the normally opened contact of breaking coil TQ and breaking coil TQ is connected between link 1nB17 and power cathode bus 1nB09,
The coil of the coil of the first closing operation position relay HWJ1, the coil of the second closing operation position relay HWJ2, the 3rd closing operation position relay HWJ3 and the 5th resistance R 5 are connected between link 1nB15 and positive source bus 1nB01,
After the normally opened contact parallel connection of the normally opened contact of the first closing operation position relay HWJ1, the normally opened contact of the second closing operation position relay HWJ2, the 3rd closing operation position relay HWJ3, be connected in the current supply circuit of combined floodgate indicator light HD.
Embodiment two, in conjunction with Fig. 1, this embodiment is described; this embodiment is with the difference of the portable line protective devices described in embodiment one; the coil of described the first tripping position relay TWJ1, the coil of the second tripping position relay TWJ2 and a 3rd tripping position relay TWJ3 diode all in parallel, the negative electrode of described diode is connected with positive source bus 1nB01.
Embodiment three, in conjunction with Fig. 1, this embodiment is described; this embodiment is with the difference of the portable line protective devices described in embodiment one; the coil of the coil of described the first closing operation position relay HWJ1, the coil of the second closing operation position relay HWJ2 and a 3rd closing operation position relay HWJ3 diode all in parallel, the negative electrode of described diode is connected with positive source bus 1nB01.
Embodiment four, in conjunction with Fig. 1, this embodiment is described; this embodiment is with the difference of the portable line protective devices described in embodiment one; diode of coils from parallel connection of coils of described voltage-type trip-proof lockout relay TBJV, the negative electrode of described diode is connected with link 1nB12.
The difference of the portable line protective devices described in embodiment five, this embodiment and embodiment one is, it also comprises that buffering is cotton, the cotton lower surface that is arranged on the case lid of casing of described buffering.
In present embodiment, increase buffering cotton, can in the process of carrying, better protect internal circuit, thereby the short circuit causing due to collision and situation about opening circuit can not occur.
The difference of the portable line protective devices described in embodiment six, this embodiment and embodiment five is, it also comprises handle, and described handle is fixed on the sidewall of casing.
The difference of the portable line protective devices described in embodiment seven, this embodiment and embodiment one is, the breaker tripping and closing line interface employing aviation plug interface that described terminal board is drawn.
The utility model exploitation is simple; with low cost; protective circuit is fixed in a casing; and arrange at casing back fixed terminal; protective circuit and base terminal board are carried out to distribution; then draw merit alternating current streamline, alternating current line ball, direct current supply line, breaker tripping and closing line etc. from terminal board, make it possess the trip protection function identical with error protection.
Casing described in the utility model adopts metal enclosed formation, durable, volume is little, terminal board electric current, what voltage outlet adopted is the flexible cord composition with contact pin, breaker tripping and closing line adopts aviation plug to form, very convenient when on-the-spot use, for the electric current with scribing, voltage terminal can directly be inserted on its terminal board jack, install fast, and on protection screen, breaker tripping and closing line is drawn by terminal board and is connected on aviation socket through wire casing, when use, be directly connected with the aviation plug on movable protective device, efficient and convenient safety, without any hidden danger, working has ensured that operations staff also can proper operation, for the plenty of time has been saved in troubleshooting.
Protective device described in the utility model has good social effect and economic benefits.Calculate taking a 66kV line load electric current as 150A, its electric power is 1, 732*66*150*0.95=16290kW, when a general route protection fault because spare part is by the electric company that delivers of producer, processed at the scene of taking immediately by relay personnel again, cause the line outage time generally to need 5 to 6 days, therefore the electric weight of loss is approximately 16290*24*5=1954800kWh, there will be protection exception or failure problems by the annual approximately 2-3 bar circuit of statistics, taking the every degree electricity of electricity price profit as 0.1 yuan, its economic benefit is minimum is 1954800*2*0.1=390960 unit, the most conservative i.e. economic benefit that also will reach 400,000 yuan
Claims (7)
1. portable line protective devices; it is characterized in that; it comprises casing, terminal board, pressing plate and protective circuit; a side of casing is panel; described terminal board and pressing plate are installed on the panel of casing; protective circuit is fixed on the inside of casing, and described protective circuit comprises electric current and voltage loop, exit plate and operation circuit
Described operation circuit comprises the first tripping position relay (TWJ1), the second tripping position relay (TWJ2), the 3rd tripping position relay (TWJ3), combined floodgate latching relay (HBJ), voltage-type trip-proof lockout relay (TBJV), closing contactor (HC), closing relay (HJ), closing pressure blocking relay (HYJ), tripping operation latching relay (TBJ), close rear position relay (KKJ), tripping operation pressure atresia relay (TYJ), breaking coil (TQ), tripping operation indicator light (LD), combined floodgate indicator light (HD), the first closing operation position relay (HWJ1), the second closing operation position relay (HWJ2), the 3rd closing operation position relay (HWJ3), tripping relay (TJ), the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5), the first diode (D1), the second diode (D2), the 3rd diode (D3), the first switch (S1), second switch (S2) and the 3rd switch (S3),
After the normally opened contact parallel connection of the normally opened contact of the first tripping position relay (TWJ1), the normally opened contact of the second tripping position relay (TWJ2) and the 3rd tripping position relay (TWJ3), be connected in the current supply circuit of tripping operation indicator light (LD),
The coil of the coil of the first tripping position relay (TWJ1), the coil of the second tripping position relay (TWJ2), the 3rd tripping position relay (TWJ3) and the first resistance (R1) are connected between link 1nB13 and positive source bus 1nB01, described link 1nB13 is connected with link 1nB11
After the first normally opened contact of combined floodgate latching relay (HBJ) and the second normally opened contact parallel connection, and the normally-closed contact of voltage-type trip-proof lockout relay (TBJV), coil, link 1nB11, the normally-closed contact of closing contactor (HC) and the control coil of closing contactor (HC) of combined floodgate latching relay (HBJ) be connected between positive source bus 1nB01 and power cathode bus 1nB09
The normally-closed contact of described voltage-type trip-proof lockout relay (TBJV) and the first switch (S1) are connected in parallel,
The normally opened contact of closing relay (HJ) and brace 1LP2 are connected between positive source bus 1nB01 and link 1nB18,
The anodic bonding of link 1nB18 and the second diode (D2), the negative electrode of link 1nB12 the second diode (D2) connects,
After the first normally-closed contact HYJ1 of second switch (S2), closing pressure blocking relay (HYJ) and the second normally-closed contact HYJ2 of closing pressure blocking relay (HYJ) are connected in parallel, and the 3rd diode (D3) be connected between link 1nB18 and link 1nB12, wherein the anode of the 3rd diode (D3) is connected with link 1nB12
After the normally opened contact of tripping operation latching relay (TBJ) and the normally opened contact of voltage-type trip-proof lockout relay (TBJV) are connected in parallel, and coil and second resistance (R2) of voltage-type trip-proof lockout relay (TBJV) be connected between link 1nB12 and power cathode bus 1nB09
The actuation coil and the 3rd resistance (R3) that close rear position relay (KKJ) are connected between link 1nB12 and power cathode bus 1nB09,
The resetting coil and the 4th resistance (R4) that close rear position relay (KKJ) are connected between link 1nB14 and power cathode bus 1nB09,
The anode of the first diode (D1) is connected with link 1nB14, and the negative electrode of the first diode (D1) is connected with link 1nB16,
The 3rd switch (S3), tripping operation pressure atresia relay (TYJ) the first normally-closed contact (TYJ1) and tripping operation pressure atresia relay (TYJ) the second normally-closed contact (TYJ2) be connected in parallel after, and trip latching relay (TBJ) normally opened contact be connected between link 1nB16 and positive source bus 1nB01
The 3rd switch (S3), tripping operation pressure atresia relay (TYJ) the first normally-closed contact TYJ1 and tripping operation pressure atresia relay (TYJ) the second normally-closed contact TYJ2 be connected in parallel after, and trip latching relay (TBJ) coil be connected between link 1nB16 and link 1nB17
The normally opened contact of tripping relay (TJ) and brace 1LP1 are connected between positive source bus 1nB01 and link 1nB16,
The control coil of the normally opened contact of breaking coil (TQ) and breaking coil (TQ) is connected between link 1nB17 and power cathode bus 1nB09,
The coil of the coil of the first closing operation position relay (HWJ1), the coil of the second closing operation position relay (HWJ2), the 3rd closing operation position relay (HWJ3) and the 5th resistance (R5) are connected between link 1nB15 and positive source bus 1nB01,
After the normally opened contact parallel connection of the normally opened contact of the first closing operation position relay (HWJ1), the normally opened contact of the second closing operation position relay (HWJ2), the 3rd closing operation position relay (HWJ3), be connected in the current supply circuit of combined floodgate indicator light (HD).
2. portable line protective devices according to claim 1; it is characterized in that; the coil of described the first tripping position relay (TWJ1), the coil of the second tripping position relay (TWJ2) and the 3rd tripping position relay (TWJ3) diode all in parallel, the negative electrode of described diode is connected with positive source bus 1nB01.
3. portable line protective devices according to claim 1; it is characterized in that; the coil of the coil of described the first closing operation position relay (HWJ1), the coil of the second closing operation position relay (HWJ2) and the 3rd closing operation position relay (HWJ3) diode all in parallel, the negative electrode of described diode is connected with positive source bus 1nB01.
4. portable line protective devices according to claim 1, is characterized in that, diode of coils from parallel connection of coils of described voltage-type trip-proof lockout relay (TBJV), and the negative electrode of described diode is connected with link 1nB12.
5. portable line protective devices according to claim 1, is characterized in that, it also comprises that buffering is cotton, the cotton lower surface that is arranged on the case lid of casing of described buffering.
6. portable line protective devices according to claim 5, is characterized in that, it also comprises handle, and described handle is fixed on the sidewall of casing.
7. portable line protective devices according to claim 1, is characterized in that, the breaker tripping and closing line interface that described terminal board is drawn adopts aviation plug interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420194736.2U CN203774746U (en) | 2014-04-21 | 2014-04-21 | Mobile line protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420194736.2U CN203774746U (en) | 2014-04-21 | 2014-04-21 | Mobile line protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203774746U true CN203774746U (en) | 2014-08-13 |
Family
ID=51291898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420194736.2U Withdrawn - After Issue CN203774746U (en) | 2014-04-21 | 2014-04-21 | Mobile line protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203774746U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904610A (en) * | 2014-04-21 | 2014-07-02 | 国家电网公司 | Movable line protection device |
-
2014
- 2014-04-21 CN CN201420194736.2U patent/CN203774746U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904610A (en) * | 2014-04-21 | 2014-07-02 | 国家电网公司 | Movable line protection device |
| CN103904610B (en) * | 2014-04-21 | 2016-08-31 | 国家电网公司 | Portable line protective devices |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140813 Effective date of abandoning: 20160831 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |