CN102437551A - Over-current protection device for transformer and electric locomotive - Google Patents
Over-current protection device for transformer and electric locomotive Download PDFInfo
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- CN102437551A CN102437551A CN2011103920986A CN201110392098A CN102437551A CN 102437551 A CN102437551 A CN 102437551A CN 2011103920986 A CN2011103920986 A CN 2011103920986A CN 201110392098 A CN201110392098 A CN 201110392098A CN 102437551 A CN102437551 A CN 102437551A
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Abstract
The invention provides an over-current protection device for a transformer and an electric locomotive. The device comprises a current transformer, a first switch component and a second switch component, wherein a primary winding of the current transformer is connected in series with an input circuit of the transformer; the control end of the first switch component, the control end of the second switch component and a secondary winding of the current transformer form a current circuit; and controlled switches of the first and second switch components are connected in series with a control circuit of a protection switch in the input circuit of the transformer. By the protection device, the aim of identifying magnetizing inrush current and short-circuit current to determine whether to protect the transformer or not can be fulfilled only by various hardware circuits without designing a complex program, developing a proper algorithm and setting a computer for executing the program and the algorithm. The device is easy to implement and low in cost.
Description
Technical field
The present invention relates to current protection technology, relate in particular to a kind of transformer overcurrent protection device and electric locomotive.
Background technology
In electric railway, contact line is the power supply grid of electric railway, and electric locomotive obtains electric energy through contact line.
On the locomotive roof pantograph is installed; Contact with contact line conducting wire to obtain electric energy through pantograph from contact line; Equipment such as traction transformer through being provided with on the locomotive carry out conversion to the voltage of introducing from contact line; With voltage source, for example, be traction convertor power supply in the locomotive as the relevant power equipment on the locomotive.Between the primary side of pantograph and traction transformer, be provided with main circuit breaker, control the break-make of connection line between pantograph and the traction transformer primary side through the break-make of main circuit breaker.
Traction transformer is provided with safeguard measure so that traction transformer (hereinafter to be referred as transformer) is protected usually as the visual plant of giving in the locomotive power supply circuit.
The circuit diagram of the traction transformer overcurrent protective device that Fig. 6 provides for prior art, as shown in Figure 6, this protective device comprises current transformer 10, overcurrent relay 30 and relay 15.
In the primary side of traction transformer 31 and the connection line between the main circuit breaker 17, be serially connected with a winding of current transformer 10; The secondary winding of current transformer 10 is serially connected in the input circuit of overcurrent relay 30; The output normally opened contact 301 of overcurrent relay 30 and the input of relay 15 are serially connected in the Train Control circuit 19, and the output normally opened contact 151 of relay 15 is serially connected in the main circuit breaker control circuit 20.
When the primary side generation overcurrent of transformer; This overcurrent can flow through a winding of current transformer; Make the secondary side of current transformer can give birth to the increase of mutual inductance electric current, the size of this mutual inductance electric current can surpass the setting current of overcurrent relay, thereby makes the overcurrent relay action; The output normally opened contact of overcurrent relay is closed, and then has connected the Train Control circuit; The Train Control circuit provides operating voltage for the input of relay, and it is electric that coil in the relay is got, and makes the output normally opened contact of relay closed; And then connected the main circuit breaker control circuit; Main circuit breaker is broken off, also just broken off the connection line between pantograph and the traction transformer primary side, the primary side of traction transformer no longer includes overcurrent and flows through; And then, traction transformer is carried out insulation blocking.
The reason that causes traction transformer primary side overcurrent has two kinds usually, and a kind of is because the overcurrent that the magnetizing inrush current that main circuit breaker breaks off or closed action produces causes, and a kind of is because the overcurrent that the traction transformer internal short circuit fault causes.
In the above-mentioned measure that traction transformer is protected,, promptly break off main circuit breaker as long as detect the primary side generation overcurrent of traction transformer; The overcurrent that can't distinguish the overcurrent that causes because of power transformer interior fault or cause because of main circuit breaker breaks off or closed action produces magnetizing inrush current; And if the overcurrent that causes because of magnetizing inrush current because the time is shorter, generally can not cause damage to transformer; Need not protect transformer; Therefore, this kind safeguard measure often causes misoperation, influences the normal operation of train.
For correctly distinguishing specifically is the overcurrent above-mentioned which kind of reason causes; Usually adopt computer that the electric current of the transformer primary side of collection is carried out Fourier analysis at present; Analyze first-harmonic and each harmonic in the electric current, and calculate fundamental voltage amplitude and the ratio of secondary harmonic amplitude in the electric current, when ratio greater than 0.2 the time; Judge that overcurrent is owing to magnetizing inrush current causes; When ratio less than 0.15 the time, be judged as overcurrent owing to the transformer internal short circuit fault causes, and then transformer protected according to analysis result.
But, this kind guard method, not only technical difficulty is big, and development cost is high.
Summary of the invention
First aspect of the present invention provides a kind of transformer overcurrent protection device, to reduce the cost that transformer is carried out overcurrent protection.
Transformer overcurrent protection device provided by the invention comprises:
Current transformer, a winding of said current transformer is serially connected with in the incoming line of transformer;
First switch module and second switch assembly, the control end of the control end of said first switch module, second switch assembly and the secondary winding of said current transformer form current circuit;
The controlled switch of said first switch module and the controlled switch series of second switch assembly are connected in the control circuit of the protection switch in the transformer incoming line;
Wherein, Flow through at the alternating current positive half period under the state of control end of said first switch module; The control end of said first switch module is controlled the controlled switch closure setting-up time of said first switch module; Flow through at the alternating current negative half-cycle under the state of control end of said second switch assembly; Said second switch assembly control end is controlled the controlled switch closure setting-up time of said second switch assembly, and said setting-up time is greater than 1/2nd of the alternating current cycle, and the effective value of said alternating current positive half period and negative half-cycle is all greater than setting threshold value.
Another aspect of the present invention provides a kind of electric locomotive, to reduce the cost that transformer in the electric locomotive is carried out overcurrent protection.
Electric locomotive provided by the invention comprises transformer and pantograph, and the incoming line of said transformer links to each other with said pantograph, and is connected with protection switch in the incoming line of said transformer, also comprises overcurrent protective device provided by the invention.
This transformer overcurrent protective device when producing short circuit current in the transformer incoming line, breaks off protection switch so that transformer is protected; And when producing magnetizing inrush current in the transformer incoming line, do not break off protection switch, needn't be so that transformer be protected; This protective device does not need the program and the suitable algorithm of exploitation of complex design; And the computer of carrying out this program and algorithm is set, only can reach and differentiate magnetizing inrush current and short circuit current, the purpose of whether transformer being protected with selection through various hardware circuits; This device is realized simple, and cost is low.
Description of drawings
Fig. 1 is the structural representation of the transformer overcurrent protection device that the embodiment of the invention provided;
Fig. 2 is the transformer overcurrent protection manipulated or operated apparatus that another embodiment of the present invention provided;
Fig. 3 is the transformer overcurrent protection manipulated or operated apparatus that further embodiment of this invention provided;
Fig. 4 is the circuit diagram of the part-structure of the transformer overcurrent protection device that further embodiment of this invention provided;
Fig. 5 is for being applied to the transformer overcurrent protection device that the embodiment of the invention provided in the circuit diagram of electric locomotive top structure;
The circuit diagram of the traction transformer overcurrent protective device that Fig. 6 provides for prior art.
Embodiment
The embodiment of the invention provides a kind of transformer overcurrent protection device; Fig. 1 is the structural representation of the transformer overcurrent protection device that the embodiment of the invention provided; As shown in Figure 1, this device comprises current transformer 10, first switch module 11 and second switch assembly 12.
A winding 101 of current transformer 10 is serially connected with in the incoming line of transformer 13; The secondary winding 102 of control end 121 summation current transformers of the control end 111 of first switch module 11, second switch assembly 12 forms current circuit; The controlled switch 112 of first switch module 11 and the controlled switch 122 of second switch assembly 12 are serially connected with in the control circuit 141 of the protection switch 14 in transformer 13 incoming lines.
Flow through at the alternating current positive half period under the state of control end 111 of first switch module 11; The controlled switch 112 closed setting-up times of control end 111 controls first switch module 11 of first switch module 11; Flow through at the alternating current negative half-cycle under the state of control end 121 of second switch assembly 12; The controlled switch 122 closed setting-up times of the control end 121 control second switch assemblies 12 of second switch assembly 12; Setting-up time is greater than 1/2nd of the alternating current cycle, and the effective value of alternating current positive half period and negative half-cycle is all greater than setting threshold value.
Current transformer is made up of the iron core and the winding of closure usually, its umber of turn seldom, string is in the circuit of the electric current that needs are measured, so whole electric currents that it has a circuit flow through, the secondary winding turn ratio is more, is serially connected in the protection loop.
The effect of current transformer be can numerical value bigger convert numerical value less current through the electric current of a winding into through certain no-load voltage ratio through secondary winding, be used for protecting, purposes such as measurement.The multiple that dwindles through the no-load voltage ratio may command that current transformer is set is 400/5 current transformer like no-load voltage ratio, can be reality that the current transitions of 400A is the electric current of 5A.In the present embodiment, no-load voltage ratio can be set as required, the setting multiple that just dwindles.
Transformer is to utilize electromagnetic induction principle, and to the device that the size of input voltage and output voltage is carried out conversion, transformer mainly comprises winding and secondary winding; One time winding is used to receive electric energy; Connect the voltage source of input, secondary winding is used to see off electric energy, and output is through the voltage after the conversion; Usually link to each other with load, think that load provides suitable voltage.
Every kind of transformer all has specific capacity; During the transformer operate as normal; Flow through electric current in the transformer incoming line, just pass through the electric current of a winding of transformer, can not surpass the rated current of transformer usually; If the electric current in the transformer incoming line surpasses rated current (to call overcurrent in the following text) for a long time, can damage transformer.
Cause that the reason that produces overcurrent in the transformer incoming line has two kinds usually, a kind of is because the overcurrent (to call magnetizing inrush current in the following text) that the magnetizing inrush current that the protection switch (for example main circuit breaker) in the transformer incoming line breaks off or closed action produces causes; A kind of is because the overcurrent (hereinafter to be referred as short circuit current) that the traction transformer internal short circuit fault causes.
First switch module and second switch assembly can adopt relay, and as control end, the output contact of relay is as controlled switch with the input of relay, when the electric current of input surpasses certain limitation, and the output closing of contact.
Above-mentioned overcurrent protective device is the basis with the different characteristics of magnetizing inrush current and short circuit current in the transformer incoming line.Know that from the mechanism that magnetizing inrush current produces it is an aperiodic concussion, the decaying dc signal of telecommunication; And short circuit current is the ac signal of a decay.Think that below the basis introduces the operation principle of this protective device.
Usually under the state, flow through electric current in the transformer incoming line less than rated current, this electric current can flow through a winding of current transformer; Make the secondary winding of current transformer produce the mutual inductance electric current, still, the effective value of this mutual inductance electric current is less than the operating current value of first switch module and second switch assembly; At this moment; First switch module and second switch assembly do not produce action, and the controlled switch in first switch module and the second switch assembly is off-state, and the control circuit of the protection switch in the transformer incoming line is an off-state; Protection switch is closed, the transformer operate as normal.
Above-mentioned setting threshold value is the operating current value of first switch module and second switch assembly.
When producing short circuit current in the transformer incoming line, this overcurrent can flow through a winding of current transformer, makes the mutual inductance current ratio of the secondary winding generation of current transformer just often want big.Because this mutual inductance electric current is an alternating current; Positive half period at this alternating current; Because the effective value of this electric current positive half period is greater than the operating current value of first switch module, therefore, the first switch module control end is controlled the controlled switch closure setting-up time of first switch module; At the negative half-cycle of this electric current, because the effective value of this electric current negative half-cycle is also greater than the operating current value of second switch assembly, therefore, the controlled switch closure setting-up time of second switch assembly control end control second switch assembly.
And, because the closing time of controlled switch in first switch module and the controlled switch in the second switch assembly is greater than 1/2nd of the alternating current cycle, therefore; In the one-period of this alternating current; The controlled switch of first switch module and the controlled switch of second switch assembly are all closed, thereby have connected the control circuit of the protection switch in the transformer incoming line, and protection switch is broken off; Also just broken off the incoming line of transformer; No longer include overcurrent in the transformer and flow through, transformer has been played protective effect, prevent that transformer from damaging.
And when producing magnetizing inrush current in the transformer incoming line, this overcurrent also can flow through a winding of current transformer, makes the mutual inductance current ratio of the secondary winding generation of current transformer just often want big.But because this overcurrent is a direct current; This electric current can only flow along a fixed-direction; Or it is clockwise or counterclockwise; At this moment, or the first switch module control end controls the controlled switch closure setting-up time of first switch module, or the controlled switch closure setting-up time of second switch assembly control end control second switch assembly; Can not make the controlled switch in first switch module and the second switch assembly closed simultaneously, just can not connect the control circuit of the protection switch in the transformer incoming line yet, protection switch can not break off yet, and transformer is not protected.
Can know that by technique scheme this transformer overcurrent protective device is when producing short circuit current in the transformer incoming line; Break off protection switch so that transformer is protected, and, do not break off protection switch when in the transformer incoming line during generation magnetizing inrush current; Needn't be so that transformer to be protected, this protective device does not need the program and the suitable algorithm of exploitation of complex design, and the computer of this program of execution and algorithm is set; Only can reach and differentiate magnetizing inrush current and short circuit current through various hardware circuits; With the purpose of selecting whether transformer to be protected, this device is realized simple, and cost is low.
Fig. 2 is the transformer overcurrent protection manipulated or operated apparatus that another embodiment of the present invention provided; As shown in Figure 2; In this protective device, first switch module comprises first overcurrent relay 113 and first diode 114, and the second switch assembly comprises second overcurrent relay 123 and second diode 124.
The input of the secondary winding 102 of current transformer 10 and the input of first overcurrent relay 113 and second overcurrent relay 123 forms current circuit.
The output normally opened contact 1231 of the output normally opened contact 1131 of first overcurrent relay 113 and second overcurrent relay 123 all is serially connected with in the control circuit 141 of the protection switch in the transformer incoming line.
Wherein, at the alternating current positive half period, 114 conductings of first diode, at the alternating current negative half-cycle, 124 conductings of second diode.
The relay that first overcurrent relay in the present embodiment and second overcurrent relay can adopt time-delay to break off; This delay time can be set as required; In the present embodiment; This delay time can be set according to the cycle of alternating current in the short circuit current, and this delay time should be half that is set to greater than this alternating current cycle.
The input of first overcurrent relay and first diode are as the control end of first switch module, and the output normally opened contact of first overcurrent relay is as the controlled switch of first switch module; The input of second overcurrent relay and second diode are as the control end of second switch assembly, and the output normally opened contact of second overcurrent relay is as the controlled switch of second switch assembly.
The operation principle of the protective device that present embodiment provides is:
Usually under the state, flow through electric current in the transformer incoming line less than rated current, at this moment; The effective value of electric current that flows through first overcurrent relay or the second overcurrent relay input is less than the operating current value (promptly setting threshold value) of overcurrent relay; Just less than predetermined threshold value, therefore, the output normally opened contact of first overcurrent relay or second overcurrent relay all is failure to actuate; Be off-state; The control circuit of the protection switch in the transformer incoming line is an off-state, and protection switch is closed, the transformer operate as normal.
When producing short circuit current in the transformer incoming line, this overcurrent can flow through a winding of current transformer, makes the mutual inductance current ratio of the secondary winding generation of current transformer just often want big; And, because this mutual inductance electric current is an alternating current, at the positive half period of this electric current; Electric current is the direction shown in 2, because first diode is parallelly connected with first overcurrent relay, at this moment; First diode is in the forward conduction state, and first overcurrent relay is by short circuit, and its input does not have electric current to pass through; The normally opened contact of its output is failure to actuate, and be off-state still, and second diode is in reverse blocking state; Electric current will flow into the input of second overcurrent relay; Because of the effective value of the electric current that flows through this second overcurrent relay input greater than the operating current value (just setting threshold value) of overcurrent relay, the action of the output normally opened contact of second overcurrent relay, normally opened contact is with closure.
At the negative half-cycle of this electric current, the sense of current and shown in Figure 2 in the opposite direction is because second diode is parallelly connected with second overcurrent relay; At this moment, second diode is in the forward conduction state, and second overcurrent relay is fallen by short circuit; Its input does not have electric current to pass through, and the normally opened contact of output is failure to actuate, and still is off-state; And first diode is in reverse blocking state, and electric current will flow into the input of first overcurrent relay, because of the effective value of the electric current that flows through this first overcurrent relay input greater than setting threshold value; The output normally opened contact action of first overcurrent relay, normally opened contact is with closure.
Because the output normally opened contact of first overcurrent relay and the output normally opened contact of second overcurrent relay are the time-delay break contact, and delay time half the greater than this alternating current cycle, therefore; When the positive half period of alternating current, the output normally opened contact of first overcurrent relay is closed, and will after the half the time greater than the alternating current cycle, just break off; And when the negative half-cycle of alternating current; The output normally opened contact of second overcurrent relay is closed, therefore, and in the one-period of this alternating current; The output normally opened contact of first overcurrent relay and second overcurrent relay all is in closure state; Thereby connected the control circuit of the protection switch in the transformer incoming line, protection switch is broken off, also just broken off the incoming line of transformer; No longer include electric current in the transformer and flow through, transformer has been played protective effect.
And when producing magnetizing inrush current in the transformer incoming line, this overcurrent also can flow through a winding of current transformer, makes the mutual inductance current ratio of the secondary winding generation of current transformer just often want big.But because this mutual inductance electric current is a direct current; This electric current can only flow along a fixed-direction, or clockwise or counterclockwise, at this moment; This electric current perhaps makes the output normally opened contact closure of first overcurrent relay or makes the output normally opened contact of second overcurrent relay; Can not make the output normally opened contact of first overcurrent relay and second overcurrent relay closed simultaneously, therefore, also just can not connect the control circuit of the protection switch in the transformer incoming line; Protection switch can not break off yet, and transformer is not protected.
In the present embodiment; Combinational circuit through overcurrent relay and diode realizes differentiating magnetizing inrush current and short circuit current, and with the function of selecting whether transformer to be protected, this circuit response time is fast; The real-time guard that can carry out transformer; When finding that protection switch breaks off, can know that internal short circuit fault has appearred in transformer, in time transformer is keeped in repair.
Only provide a kind of first switch module and second switch assembly of form in the present embodiment, above-mentioned first switch module and second switch assembly can have multiple mode, are not limited to the mode that present embodiment provides.For example, first switch module can be the circuit of being made up of the relay and the power electronic device of other types, and the connected modes such as connection in series-parallel through design relay and power electronic device are to realize above-mentioned function.
Fig. 3 is the transformer overcurrent protection manipulated or operated apparatus that further embodiment of this invention provided; As shown in Figure 3; The protective device of present embodiment on the basis of circuit diagram shown in Figure 2, also comprises relay 15; Wherein, the output normally opened contact 1231 of the output normally opened contact 1131 of the input of relay 15, first overcurrent relay 113 and second overcurrent relay 123 all is serially connected with the two ends of a voltage source 16; The output normally opened contact 151 of relay 15 is serially connected with in the control circuit 141 of the protection switch 14 in transformer 13 incoming lines.
In the present embodiment, whether the output normally opened contact of relay is connected the switch of the control circuit of the protection switch in the transformer incoming line as control.
When the output normally opened contact of first overcurrent relay and second overcurrent relay is all closed, will connect voltage source, make the input of relay have electric current to pass through; Thereby coil gets electricly in the relay, makes the output normally opened contact of relay closed; Thereby connected the control circuit of the protection switch in the transformer incoming line, protection switch is broken off, broken off the incoming line of transformer; No longer include electric current in the transformer and flow through, transformer has been played protective effect.
Fig. 4 is the circuit diagram of the part-structure of the transformer overcurrent protection device that further embodiment of this invention provided; As shown in Figure 4; Above-mentioned first diode 114 and second diode 124 include two groups of diode connected in parallel, and comprise two diode in series in every group.
In the present embodiment; Terminal connector can be set; Secondary winding 102 two ends of current transformer 10 are connected to binding post a and b respectively; The input of first overcurrent relay 113 is connected to binding post a, and the input of second overcurrent relay 123 is connected to binding post b, and binding post c and d are connected in the control circuit of the protection switch in the transformer incoming line; The output normally opened contact 1131 of first overcurrent relay 113 is connected to binding post c, and the output normally opened contact 1231 of second overcurrent relay 123 is connected to binding post d.
Present embodiment through the connected mode with above-mentioned a plurality of diode serial or parallel connections, can increase the capacity that each diode place branch road bears electric current, to adapt to the demand of the different capabilities transformer being carried out overcurrent protection.
The embodiment of the invention also provides can a kind of electric locomotive; Comprise transformer 13 and pantograph 17; The incoming line of transformer 13 links to each other with pantograph 17, and is connected with protection switch 14 in the incoming line of transformer 13, also comprises the overcurrent protective device that the embodiment of the invention provides.
Fig. 5 is for being applied to the transformer overcurrent protection device that the embodiment of the invention provided in the circuit diagram of electric locomotive top structure; As shown in Figure 5, in electric locomotive, usually with main circuit breaker 32 as protection switch; Pantograph 17 is used for obtaining electric energy from contact line 18; The transformer that adopts is a traction transformer 31, and main circuit breaker 32 is arranged in the incoming line of traction transformer, and; The special control circuit 20 that is provided with Train Control circuit 19 and main circuit breaker; At this moment, can the output normally opened contact 1231 of the output normally opened contact 1131 of first overcurrent relay 113 and second overcurrent relay 123 all be serially connected with in the Train Control circuit 19, the output normally opened contact 151 of relay 15 is serially connected with in the control circuit 20 of main circuit breaker.
This electric locomotive; Through adopting the protective device that the embodiment of the invention provided, can overcurrent protection be provided to the traction transformer in the transformer in the electric locomotive, particularly electric locomotive; Can reach and differentiate magnetizing inrush current and short circuit current; With the purpose of selecting whether transformer to be protected, also break off transformer when avoiding magnetizing inrush current takes place train is normally moved the influence of generation, avoid the late operation of train.Simultaneously, also play effect, guarantee the safe operation of train, and provide safeguard for passenger's safety car load trailer system protection.What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (5)
1. a transformer overcurrent protection device is characterized in that, comprising:
Current transformer, a winding of said current transformer is serially connected with in the incoming line of transformer;
First switch module and second switch assembly, the control end of the control end of said first switch module, second switch assembly and the secondary winding of said current transformer form current circuit;
The controlled switch of said first switch module and the controlled switch series of second switch assembly are connected in the control circuit of the protection switch in the transformer incoming line;
Wherein, Flow through at the alternating current positive half period under the state of control end of said first switch module; The control end of said first switch module is controlled the controlled switch closure setting-up time of said first switch module; Flow through at the alternating current negative half-cycle under the state of control end of said second switch assembly; Said second switch assembly control end is controlled the controlled switch closure setting-up time of said second switch assembly, and said setting-up time is greater than 1/2nd of the alternating current cycle, and the effective value of said alternating current positive half period and negative half-cycle is all greater than setting threshold value.
2. transformer overcurrent protection device according to claim 1 is characterized in that:
Said first switch module comprises first overcurrent relay and first diode, and said second switch assembly comprises second overcurrent relay and second diode, wherein,
The input of the input of the secondary winding of said current transformer and said first overcurrent relay and second overcurrent relay forms current circuit;
Said first diode is parallel to the input of said first overcurrent relay, and said second diode is parallel to the input of said second overcurrent relay, and the conducting direction of said first diode and second diode is opposite;
The output normally opened contact of said first overcurrent relay and the output normally opened contact of said second overcurrent relay all are serially connected with in the control circuit of the protection switch in the transformer incoming line;
Wherein, at the alternating current positive half period, said first diode current flow, at the alternating current negative half-cycle, said second diode current flow.
3. transformer overcurrent protection device according to claim 2 is characterized in that, also comprises:
Relay, the output normally opened contact of the input of said relay, said first overcurrent relay and the output normally opened contact of said second overcurrent relay all are serially connected with the two ends of a voltage source;
The output normally opened contact of said relay is serially connected with in the control circuit of the protection switch in the transformer incoming line.
4. according to claim 2 or 3 described transformer overcurrent protection devices, it is characterized in that, also comprise:
Said first diode and second diode include two groups of diode connected in parallel, and comprise two diode in series in every group.
5. electric locomotive; Comprise transformer and pantograph; The incoming line of said transformer links to each other with said pantograph, and is connected with protection switch in the incoming line of said transformer, it is characterized in that: also comprise the arbitrary described overcurrent protective device of claim 1-4.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457240A (en) * | 2012-05-31 | 2013-12-18 | 洛阳恒光特种变压器有限公司 | Modifying method of transformer overcurrent relay protection |
| CN106026229A (en) * | 2016-05-27 | 2016-10-12 | 宁德时代新能源科技股份有限公司 | Shunting device and working method thereof |
| CN106505640A (en) * | 2015-09-07 | 2017-03-15 | 西门子公司 | Breaker, electric supply installation and method of supplying power to |
| CN113514669A (en) * | 2021-03-29 | 2021-10-19 | 杭州西湖电子研究所 | Wiring method for equipment detection of traction substation |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1700550A (en) * | 2005-04-27 | 2005-11-23 | 叶念国 | Method for suppressing power transformer excitation surge current and suppressor |
| CN101075498A (en) * | 2007-04-13 | 2007-11-21 | 中国南车集团株洲电力机车研究所 | Method and device for inhibiting transformer no-load switchon surge |
| US7408755B1 (en) * | 2007-06-12 | 2008-08-05 | Honeywell International Inc. | Advanced inrush/transient current limit and overload/short circuit protection method and apparatus for DC voltage power supply |
| CN201266831Y (en) * | 2008-08-26 | 2009-07-01 | 广州（从化）亨龙机电制造实业有限公司 | Protection equipment for transformer of resistance welder |
| CN101488661A (en) * | 2008-01-18 | 2009-07-22 | 浙江省电力公司 | Adaptive determination apparatus differentiating transformer exciting surge and failure current |
| CN201584755U (en) * | 2009-11-26 | 2010-09-15 | 广州市高澜水技术有限公司 | Current switching-on device for neutral point direct-current blocking equipment of transformer |
| CN102176114A (en) * | 2005-08-02 | 2011-09-07 | 菲尼克斯电气公司 | Measuring device and method of measuring cyclic analog signal |
-
2011
- 2011-11-30 CN CN201110392098.6A patent/CN102437551B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1700550A (en) * | 2005-04-27 | 2005-11-23 | 叶念国 | Method for suppressing power transformer excitation surge current and suppressor |
| CN102176114A (en) * | 2005-08-02 | 2011-09-07 | 菲尼克斯电气公司 | Measuring device and method of measuring cyclic analog signal |
| CN101075498A (en) * | 2007-04-13 | 2007-11-21 | 中国南车集团株洲电力机车研究所 | Method and device for inhibiting transformer no-load switchon surge |
| US7408755B1 (en) * | 2007-06-12 | 2008-08-05 | Honeywell International Inc. | Advanced inrush/transient current limit and overload/short circuit protection method and apparatus for DC voltage power supply |
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