CN101916979B - Graded insulating neutral point integrated sealing clearance device of power transformer - Google Patents
Graded insulating neutral point integrated sealing clearance device of power transformer Download PDFInfo
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- CN101916979B CN101916979B CN2010102404459A CN201010240445A CN101916979B CN 101916979 B CN101916979 B CN 101916979B CN 2010102404459 A CN2010102404459 A CN 2010102404459A CN 201010240445 A CN201010240445 A CN 201010240445A CN 101916979 B CN101916979 B CN 101916979B
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Abstract
The invention discloses a graded insulating neutral point integrated sealing clearance device of a power transformer, comprising a contact (1), a driving mechanism (2), a motor (3), a zero sequence current transducer (4) and a motor control circuit (5). The graded insulating neutral point integrated sealing clearance device is characterized by being provided with a device control circuit (6) and an operation panel (7), wherein a control element in the device control circuit (6) is provided outwards through the operation panel (7); the contact (1), the driving mechanism (3), the motor control circuit (5), the device control circuit (6) and the operation panel (7) are sequentially connected; the contact (1) directly passes through the center of the zero sequence current transducer (4) which is connected with the operation panel (7) through a cable; and the motor control circuit (5) is connected with the operation panel (7). The invention has the functions of protecting the clearance and an earthed switch and the advantages of integral encapsulation, simple structure, accurate action and automatic operation.
Description
Technical field
The present invention relates to power system transformer neutral point overvoltage protection field, be specifically related to a kind of graded insulating neutral point integrated sealing clearance device of power transformer, be applicable to the overvoltage protection to the transformation insulated neutral.
Background technology
Voltage in the supply network is very high, and neutral point generally adopts direct grounding way, because relay protection setting configuration and prevent the requirement of the aspect such as communication interference in order to limit single-phase short circuit current, wherein has some transformers to adopt the isolated neutral mode.Under this operational mode; because thunderbolt, single-phase grounding fault etc. can cause neutral point overvoltage; and transformer is graded insulation mostly, so the insulation of overvoltage centering point causes very large threat, must the protective device Accident prevention be set to it and occur.
Up to now, the correlative study achievement that obtains both at home and abroad mainly contains following two kinds.
1 rod gap
During No. 589 literary compositions of State Power Corporation " preventing 25 important requirements of electrical production major accident " the 17 chapter " prevents the ground network accident "; the 17.9th joint regulation: " be the unusual service condition that prevents isolated isolated neutral system occurring in effectively earthed system and produce higher power-frequency overvoltage, the neutral point overvoltage of the earth-free transformer of 110～220kV should adopt excellent gap protection mode ".Rod gap simple structure, easy to maintenance, generally be installed in the open air.But operating experience shows; when system moves the generation single phase ground fault in the effective grounding mode; the factors such as the distance adjustment in gap is forbidden, gap contact technique is poor and be affected by the external environment cause the gap action easily; system's zero-sequence impedance parameter is changed, and the variation of zero-sequence current will cause the protective relaying maloperation work and cause unnecessary power failure.
2 goat's horn NEW TYPE OF COMPOSITE gaps
There are the inherent shortcomings such as distance adjustment is inaccurate, discharge voltage is unstable in the Li Chengrong of the Peng Fei of Northeast Grid Co., Ltd., the Chen Weijiang of Wuhan High Voltage Research Institute Of State Grid, North China Electric Power University etc. for solution 110, the protection of 220kV transformer neutral point when installing with the split of rod-rod gap electrode; determine the technical conditions in gap and designed the structure in gap according to the gap protection principle, developed the novel protected gap of a kind of goat's horn.This novel gap is fixed on the insulator two ends take composite insulator as mechanical support with horn electrode, and its sparking electrode and arcing electrode separation have good concentricity, advantages such as distance adjustment is accurate, Installation and Debugging are convenient and ablation resistance is strong, discharge stability.But because this gap is exposed to the open air, easily caused gap shorting by the accidental touching of the foreign objects such as insect, birds or rainwater, cause protecting malfunction.Simultaneously, the electrode that is fixed on the composite insulator two ends occupies larger horizontal area, and can only work as the protection gap and use.
Summary of the invention
For the problems referred to above, the present invention proposes a kind of graded insulating neutral point integrated sealing clearance device of power transformer.
Technical scheme provided by the invention is a kind of graded insulating neutral point integrated sealing clearance device of power transformer, contact (1), transmission mechanism (2), motor (3), punching zero sequence current mutual inductor (4) and electromotor control circuit (5), setting device control circuit (6) and guidance panel (7), the control element in the described device control circuit (6) outwards provides by guidance panel (7);
Contact (1), transmission mechanism (2), motor (3), electromotor control circuit (5), device control circuit (6) and guidance panel (7) join successively, contact (1) directly passes punching zero sequence current mutual inductor (4) center, punching zero sequence current mutual inductor (4) joins by cable and guidance panel (7), and electromotor control circuit (5) joins with guidance panel (7).
And described punching zero sequence current mutual inductor (4) is provided with punching zero sequence current mutual inductor winding lead-out terminal (4.1) and the auxiliary stroke switch is often opened node (4.2);
When device used when the protection gap, punching zero sequence current mutual inductor winding lead-out terminal (4.1) was connected to guidance panel (7) by cable; Device is when earthed switch uses, and punching zero sequence current mutual inductor winding lead-out terminal (4.1) is often opened node (4.2) automatic short circuit by the auxiliary stroke switch, no signal output.
And, described device control circuit (6) is by air switch QF2 (8), interlocking (9), stop button KA (10), thermal relay RJ (11), rotary switch SA (12), combined floodgate branch road and separating brake branch road form, described combined floodgate branch road comprises control closing switch far away (13), switch knob HA (14), contactor JLC1 normally opened contact (15), contactor JLC1 hot-wire coil (16), contactor JLC2 normally-closed contact (17), travel switch CK1 (18), described separating brake branch road comprises travel switch CK2 (19), contactor JLC1 normally-closed contact (20), contactor JLC2 hot-wire coil (21), contactor JLC2 normally opened contact (24), control separating brake switch (22) far away and opening button TA (23) form;
Air switch QF2 (8), interlocking (9), stop button KA (10), thermal relay RJ (11), join successively with rotary switch SA (12), rotary switch SA (12) joins with combined floodgate branch road and separating brake branch road respectively, control closing switch far away (13) in the combined floodgate branch road and switch knob HA (14) interlock contactor JLC1 normally opened contact (15), contactor JLC1 normally opened contact (15), contactor JLC1 hot-wire coil (16), contactor JLC2 normally-closed contact (17) and travel switch CK1 (18) join successively; Control separating brake switch far away (22) in the separating brake branch road and opening button TA (23) interlock contactor JLC2 normally opened contact (24), contactor JLC2 normally opened contact (24), contactor JLC2 hot-wire coil (21), contactor JLC1 normally-closed contact (20), travel switch CK2 (19) join successively.
And, described guidance panel (7) is provided with the device control circuit mains switch (26) that is connected with device control circuit (6), the temperature and humidity controller (27) that is connected with electromotor control circuit (5) and terminal board (25), and the control element that outwards provides by guidance panel (7) in the device control circuit (6) comprises air switch QF2 (8), rotary switch SA (12), switch knob HA (14), opening button TA (23), stop button KA (10).
And contact (1) adopts SN-1000A oil-minimum breaker contact, discharge probability 97.04%; Punching zero sequence current mutual inductor (4) adopts the punching zero sequence current mutual inductor of primary side withstand current 40kA/3s, no-load voltage ratio 100/5 and class of accuracy 10P10.
The present invention has following advantages and effect:
1) device has gap and earthed switch function concurrently: can work as the protection gap when contact disconnects and use, action is accurate, and discharge dispersity is little; Can work as earthed switch during contact closure and use, can tolerate the power current of 40kA/3s.
2) the step transformer insulation neutral point integrated sealing clearance of employing patented technology, overall package, humiture is controlled, and clearance distance is accurate, guarantees the stability of discharge.
3) contact of the present invention is selected the oil-minimum breaker contact, and ablation resistance is good, improves the gap accuracy of action; Contact resistance is little, guarantees the reliability of ground connection when using as earthed switch.
4) adopt automatic technology, seal clearance can be realized on the spot or distant place electric operating, and is simple to operate.End of operation motor auto-breaking effectively prevents misoperation.
5) current measurement and the control section of device utilize the auxiliary stroke switch automatically to realize punching zero sequence current mutual inductor secondary side short circuit, have ensured the reliability of the action of transformer zero-sequenceprotection.
Description of drawings
Fig. 1 is overall structure schematic diagram of the present invention;
Fig. 2 is the device control circuit schematic diagram of the embodiment of the invention;
Fig. 3 is the punching zero sequence current mutual inductor schematic diagram of the embodiment of the invention;
Fig. 4 is the guidance panel schematic diagram of the embodiment of the invention;
Fig. 5 is the encapsulating structure schematic diagram of the embodiment of the invention.
Embodiment
According to the usage of trade, graded insulating neutral point integrated sealing clearance device of power transformer provided by the present invention also can be called power transformer graded insulation neutral point integrated sealing clearance.Describe technical solution of the present invention in detail below in conjunction with drawings and Examples.
Fig. 1 has provided the graded insulating neutral point integrated sealing clearance device of power transformer structured flowchart, and its annexation and effect are as follows.
Contact (1), transmission mechanism (2), motor (3), electromotor control circuit (5), device control circuit (6) and guidance panel (7) join successively, be that contact (1) joins with transmission mechanism (2), motor (3) joins with transmission mechanism (2) and electromotor control circuit (5) respectively, and device control circuit (6) joins with electromotor control circuit (5) and guidance panel (7) respectively.Contact (1) directly passes punching zero sequence current mutual inductor (4) center, and punching zero sequence current mutual inductor (4) joins by cable and guidance panel (7), and electromotor control circuit (5) joins with guidance panel (7).Wherein transmission mechanism (2) adopts conventional screw rod transmission mode, electromotor control circuit (5) adopts the motor conventional control circuit, and contact (1), motor (3), punching zero sequence current mutual inductor (4) all can adopt the outsourcing conventional products.There is individual circular hole at the center of punching zero sequence current mutual inductor, is used for primary side and passes the survey current signal, and contact during enforcement (1) directly passes this circular hole and gets final product.The custom circuit that prior art electromotor control circuit (5) adopts wherein all is provided with sky and opens QF1 and motor M, and the work of motor M is subject to thermal relay RJ, contactor JLC1, JLC2 control; Circuit also provides the Temperature and Humidity Control function, is realized by condensation controller WSK and heater DJR; QF1 is air switch, and the working power of motor and temperature and humidity controller is provided; RJ is thermal relay, can disconnect the power supply of motor when the motor fault adstante febre; Contactor JLC1, JLC2 can frequently close the switch that closes, carries and cut-off the overload current of normal current and regulation, are respectively applied to control closing circuit and sub-gate circuit.The motor of embodiment (3) and corresponding electromotor control circuit (5) adopt the product of Shenyang Dongmu Electrical Equipment Co. Ltd, and setting gets final product electromotor control circuit (5) according to the product operation instruction.The present invention has designed accurate device control circuit (6) structure, and electromotor control circuit (5) operation response personnel are by the operation of guidance panel (7) to control element in the device control circuit (6).Guidance panel (7) adapting device control circuit (6) arranges, and suggestion operations panel (7) adopts the described guidance panel of utility model patent (application number 201020170035.7).
As shown in Figure 2, the device control circuit of embodiment (6) is by air switch QF2 (8), interlocking (9), stop button KA (10), thermal relay RJ (11), rotary switch SA (12), combined floodgate branch road and separating brake branch road form, described combined floodgate branch road comprises control closing switch far away (13), switch knob HA (14), contactor JLC1 normally opened contact (15), contactor JLC1 hot-wire coil (16), contactor JLC2 normally-closed contact (17), travel switch CK1 (18), described separating brake branch road comprises travel switch CK2 (19), contactor JLC1 normally-closed contact (20), contactor JLC2 hot-wire coil (21), contactor JLC2 normally opened contact (24), control separating brake switch (22) far away and opening button TA (23) form.Air switch QF2 (8) namely is the power supply of device control circuit (6) control loop that provides.
Air switch QF2 (8), interlocking (9), stop button KA (10), thermal relay RJ (11), join successively with rotary switch SA (12), rotary switch SA (12) joins with combined floodgate branch road and separating brake branch road respectively, control closing switch far away (13) in the combined floodgate branch road and switch knob HA (14) interlock contactor JLC1 normally opened contact (15), contactor JLC1 normally opened contact (15), contactor JLC1 hot-wire coil (16), contactor JLC2 normally-closed contact (17) and travel switch CK1 (18) join successively; Control separating brake switch far away (22) in the separating brake branch road and opening button TA (23) interlock contactor JLC2 normally opened contact (24), contactor JLC2 normally opened contact (24), contactor JLC2 hot-wire coil (21), contactor JLC1 normally-closed contact (20), travel switch CK2 (19) join successively.So-called interlock is exactly that contactor JLC1 normally opened contact (15) also can move after far controlling closing switch (13) or switch knob HA (14) action; After control separating brake switch (22) far away or opening button TA (23) action, contactor JLC2 normally opened contact (24) equally also can move.
Its operation principle is: air switch QF2 (8) closes, plugged, select on the spot or remote operation by rotary switch SA (12), can press on the spot switch knob HA (14) or opening button TA (23) so that contactor JLC1 normally opened contact (15) or contactor JLC2 normally opened contact (24) closure, also can far control closing switch (13) or far control separating brake switch (22) closure by remote operation, so that device control circuit (6) energising, motor (3) rotating, drive transmission mechanism (2) work, transmission mechanism (2) control contact (1) moves up or down; After contact (1) arrives assigned address, travel switch CK1 (18) or CK2 (19) disconnecting apparatus control circuit (6) power supply, contactor JLC1 hot-wire coil (16) or contactor JLC2 hot-wire coil (21) so dead electricity, so that electromotor control circuit (5) auto-breaking, motor (3) quits work.Also can make by the stop button KA (10) on the guidance panel (7) motor (3) emergent stopping work.
As shown in Figure 3, when the integrated inter space device of power transformer graded insulation neutral point provided by the invention used when the protection gap, punching zero sequence current mutual inductor winding lead-out terminal (4.1) was connected to guidance panel (7) by cable; Device is when earthed switch uses, and punching zero sequence current mutual inductor winding lead-out terminal (4.1) is often opened node (4.2) automatic short circuit by the auxiliary stroke switch, no signal output.
A large amount of power frequencies and lightning voltage impulsive discharge result of the test show: under power frequency and lightning impulse overvoltage, and energy action message when contact (1) disconnection is used as the gap, protection step transformer insulation neutral point insulation.
For the 110kV transformer neutral point:
Contact (1) adopts SN-1000A oil-minimum breaker contact, discharge probability 97.04%; Measure portion adopts the punching zero sequence current mutual inductor of primary side withstand current 40kA/3s, no-load voltage ratio 100/5, class of accuracy 10P10; Overall package adopts the encapsulating structure (utility application number 201020170035.7) of 110kV level power transformer graded insulation neutral point protecting device, forms integrated seal clearance, and clearance distance is 75～90mm.For the purpose of convenient enforcement, the encapsulating structure of embodiment is provided, referring to Fig. 5, wherein the left side is front view, and the right is the rearview on the left side: device comprises top patchboard (28), silicon rubber composite insulation overcoat (29), ground connection bronze medal (30), column (31), control box (35), base (32), position indication window (33), handle (34) and column door (36).Its position with annexation is connected: top patchboard (28), silicon rubber composite insulation overcoat (29), column (31) are connected 32 with base) connect successively up and down; On column (31), be disposed with from top to bottom ground connection bronze medal (30), position indication window (33), control box (35) and column door (36); Be respectively arranged with handle (34) at control box (35) and column door (36).Each functional part is described as follows:
1, top patchboard (28)
Top patchboard (28) is a kind of circular metal plate, is provided with binding post on it;
Its function has been electric connection function.
2, silicon rubber composite insulation overcoat (29)
Silicon rubber composite insulation overcoat (29) is a kind of cylinder sleeve with full skirt of being made by the silicon rubber composite insulation material.
Its function has been the electrical isolation effect.
3, ground connection bronze medal (30)
Ground connection bronze medal (30) is a kind of copper billet;
Its function has been electric ground connection effect.
4, column (31)
Column (31) is the square open tubular column of a kind of metal, its length * wide * height=0.3m * 0.3m * 2.5m.
Its function has been the effect of the relevant functional part of encapsulation, such as transmission mechanism (2), motor (3), punching zero sequence current mutual inductor (4), electromotor control circuit and (5) device control circuit (6).
5, control box (35)
Control box (35) is a kind of metal square box, is provided with guidance panel (7) on it;
Its function has been the effect of the relevant functional part of operation.
Referring to Fig. 4: specifically, be provided with device control circuit mains switch (26), air switch QF2 (8), temperature and humidity controller (27), rotary switch SA (12), switch knob HA (14), opening button TA (23), stop button KA (10) and terminal board (25) on the guidance panel.The device control circuit mains switch (26) that operating personnel's operation is connected with device control circuit (6) can be to device control circuit (6) outage or power supply; The temperature and humidity controller (27) of operating personnel by being connected with electromotor control circuit (5) in guidance panel (7) operation, control condensation controller WSK and heater DJR.The control element that outwards provides by guidance panel (7) in the device control circuit (6) comprises air switch QF2 (8), rotary switch SA (12), switch knob HA (14), opening button TA (23), stop button KA (10), operating personnel can operate, respectively impact.By terminal board (25), can access power supply and draw signal in the electrical connection that each element is provided easily, punching zero sequence current mutual inductor (4) is exactly to join by cable and terminal board (25), in order to be connected to the control room, be used for collection signal.Specifically, be device when use in the protection gap, punching zero sequence current mutual inductor winding lead-out terminal (4.1) is connected to terminal board (25) by cable.
6, base (32)
Base (32) is a kind of metallic plate;
Its function has been the effect of installing and fixing.
7, position indication window (33)
Position indication window (33) is a kind of transparent organic glass window;
Its function is the opening and closing state of being convenient to observing protector.
8, handle (34)
Handle (34) is a kind of metal handle with lock commonly used
Its function is to pin control box (35) and column door (36), prevents the misoperation of unrelated person.
9, column door (36)
Column door (36) is a kind of metallic door commonly used;
Its function has been safety effect.
In order to reduce the floor space of device, make device appearance attractive in appearance, reach simultaneously easy to operate purpose, embodiment is encapsulated in electric operation and control section in the column (31), and column (31) is installed in the below of silicon rubber composite insulation overcoat (29), the floor space of device only is 0.09m
2The chamber door of control box (35) and column door (36) have located to install additional handle with lock (34), have improved fail safe, prevent the misoperation of unrelated person.
Embodiment is connected to top patchboard (28) with the transformer neutral point lead-out wire when normal operation, with ground connection bronze medal (30) ground connection; Device control circuit mains switch (26) and air switch QF2 (8) on control box (35) panel all are in "on" position, temperature and humidity controller this moment (27) is in running order, can automatically detect the also humiture of adjusting device inner air.
During remote operation rotary switch SA (12) is threaded to " distant place ", sends in the distance actuating signal, device can carry out corresponding divide-shut brake or shut-down operation.
During local operation rotary switch SA (12) is threaded to " on the spot "; press switch knob HA (14) at guidance panel; the protection gap of device can be closed under the control of device control circuit (6); can see that from position indication window (33) pointer position points to closing position from open position; after arriving assigned address; electromotor control circuit (5) and device control circuit (6) auto-breaking, EO.If press stop button KA (10) in making process, feed motion can stop at once.
During local operation rotary switch SA (12) is threaded to " on the spot "; press opening button TA (23) at guidance panel; the protection gap of device can be closed under the control of device control circuit (6); can see that from position indication window (33) pointer position points to open position from closing position; after arriving assigned address; electromotor control circuit (5) and device control circuit (6) auto-breaking, EO.If press stop button KA (10) in the separating brake process, the separating brake action can stop at once.
Claims (5)
1. graded insulating neutral point integrated sealing clearance device of power transformer, comprise contact (1), transmission mechanism (2), motor (3), punching zero sequence current mutual inductor (4) and electromotor control circuit (5), it is characterized in that: setting device control circuit (6) and guidance panel (7), the control element in the described device control circuit (6) outwards provides by guidance panel (7);
Contact (1), transmission mechanism (2), motor (3), electromotor control circuit (5), device control circuit (6) and guidance panel (7) join successively, contact (1) directly passes punching zero sequence current mutual inductor (4) center, punching zero sequence current mutual inductor (4) joins by cable and guidance panel (7), and electromotor control circuit (5) joins with guidance panel (7).
2. graded insulating neutral point integrated sealing clearance device of power transformer according to claim 1, it is characterized in that: described punching zero sequence current mutual inductor (4) is provided with punching zero sequence current mutual inductor winding lead-out terminal (4.1) and the auxiliary stroke switch is often opened node (4.2);
When device used when the protection gap, punching zero sequence current mutual inductor winding lead-out terminal (4.1) was connected to guidance panel (7) by cable; Device is when earthed switch uses, and punching zero sequence current mutual inductor winding lead-out terminal (4.1) is often opened node (4.2) automatic short circuit by the auxiliary stroke switch, no signal output.
3. graded insulating neutral point integrated sealing clearance device of power transformer according to claim 1 and 2, it is characterized in that: described device control circuit (6) is by air switch QF2(8), interlocking (9), stop button KA(10), thermal relay RJ(11), rotary switch SA(12), combined floodgate branch road and separating brake branch road form, described combined floodgate branch road comprises control closing switch far away (13), switch knob HA(14), contactor JLC1 normally opened contact (15), contactor JLC1 hot-wire coil (16), contactor JLC2 normally-closed contact (17), travel switch CK1(18), described separating brake branch road comprises travel switch CK2(19), contactor JLC1 normally-closed contact (20), contactor JLC2 hot-wire coil (21), contactor JLC2 normally opened contact (24), control separating brake switch (22) far away and opening button TA(23);
Air switch QF2(8), the interlocking (9), stop button KA(10), thermal relay RJ(11) and rotary switch SA(12) join successively, rotary switch SA(12) joins with combined floodgate branch road and separating brake branch road respectively, control closing switch far away (13) in the combined floodgate branch road and switch knob HA(14) interlock contactor JLC1 normally opened contact (15), contactor JLC1 normally opened contact (15), contactor JLC1 hot-wire coil (16), contactor JLC2 normally-closed contact (17) and travel switch CK1(18) join successively; Control separating brake switch far away (22) in the separating brake branch road and opening button TA(23) interlock contactor JLC2 normally opened contact (24), contactor JLC2 normally opened contact (24), contactor JLC2 hot-wire coil (21), contactor JLC1 normally-closed contact (20), travel switch CK2(19) join successively.
4. graded insulating neutral point integrated sealing clearance device of power transformer according to claim 3, it is characterized in that: described guidance panel (7) is provided with the device control circuit mains switch (26) that is connected with device control circuit (6), the temperature and humidity controller (27) that is connected with electromotor control circuit (5), and terminal board (25), the control element that outwards provides by guidance panel (7) in the device control circuit (6) comprises air switch QF2(8), rotary switch SA(12), switch knob HA(14), opening button TA(23), stop button KA(10).
5. graded insulating neutral point integrated sealing clearance device of power transformer according to claim 1 and 2 is characterized in that:
Contact (1) adopts SN-1000A oil-minimum breaker contact, discharge probability 97.04%; Punching zero sequence current mutual inductor (4) adopts the punching zero sequence current mutual inductor of primary side withstand current 40kA/3s, no-load voltage ratio 100/5 and class of accuracy 10P10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102404459A CN101916979B (en) | 2010-07-27 | 2010-07-27 | Graded insulating neutral point integrated sealing clearance device of power transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102404459A CN101916979B (en) | 2010-07-27 | 2010-07-27 | Graded insulating neutral point integrated sealing clearance device of power transformer |
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| Publication Number | Publication Date |
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| CN101916979A CN101916979A (en) | 2010-12-15 |
| CN101916979B true CN101916979B (en) | 2013-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010102404459A Active CN101916979B (en) | 2010-07-27 | 2010-07-27 | Graded insulating neutral point integrated sealing clearance device of power transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102226705A (en) * | 2011-04-01 | 2011-10-26 | 四川省绵阳西南自动化研究所 | Moving measurement apparatus based on linear module |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5790356A (en) * | 1994-10-13 | 1998-08-04 | Bottrell; Gerald W. | Transformer protection system for protecting source transformers from ill effects of zero-sequence currents |
| CN201383671Y (en) * | 2009-04-03 | 2010-01-13 | 山东泰开隔离开关有限公司 | Neutral point grounding protective device of transformer |
| CN201426015Y (en) * | 2009-06-15 | 2010-03-17 | 上海安越电气工程技术有限公司 | Transformer neutral point composite apparatus device |
-
2010
- 2010-07-27 CN CN2010102404459A patent/CN101916979B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5790356A (en) * | 1994-10-13 | 1998-08-04 | Bottrell; Gerald W. | Transformer protection system for protecting source transformers from ill effects of zero-sequence currents |
| CN201383671Y (en) * | 2009-04-03 | 2010-01-13 | 山东泰开隔离开关有限公司 | Neutral point grounding protective device of transformer |
| CN201426015Y (en) * | 2009-06-15 | 2010-03-17 | 上海安越电气工程技术有限公司 | Transformer neutral point composite apparatus device |
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| CN101916979A (en) | 2010-12-15 |
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