CN103625310B - A kind of electric railway subregion institute's automatic neutral-section passing system and automatic passing over of neutral section method thereof - Google Patents

Abstract

An automatic phase separation system and automatic phase separation method for an electrified railway, the system comprising: Catenary 1 and Catenary 2 are respectively connected to a neutral segment through Electric Segment 1 and Electric Segment 1; Transformer 1, current transformer 2 and normally open switch 1 are connected in series and then connected in parallel to electric segment 1, current transformer 3 and normally closed switch 2 are connected in series and then connected in parallel to electric segment 2; catenary 1, The two ends are respectively connected to voltage transformers 1 and 2; pantograph detector 1 is installed on one pillar of the current transformer, pantograph detector 2 is installed on the first section of the electric section, and power receiving instrument is installed on the second section of the electric section. Bow detector 3; current transformer 1, 2, 3, pantograph detector 1, 2, 3, voltage transformer 1, 2, and normally open switch 1 are all connected to the control unit. The system has a simple structure, less investment, and is easy to implement. It can more completely and reliably realize the automatic phase separation of electrified railway divisions, and has a locking function when the system is abnormal.

Description

An automatic phase separation system and automatic phase separation method for electrified railway divisions

technical field

The invention relates to an automatic phase separation system and an automatic phase separation method for electrified railway divisions.

Background technique

my country's electrified railway generally adopts single-phase power frequency AC system. In order to make the three-phase load of the power system as balanced as possible, the electrified railway often adopts the scheme of alternating phase sequence and phase-separated partition power supply. The adjacent power supply intervals at the phase-separation partition are divided by air or insulators to form insulating electrical phase separation, referred to as electrical phase separation or phase separation.

In order to prevent electric locomotives from burning out catenary suspension components due to arcing through phase separation, and even causing accidents such as phase-to-phase short circuit, when the train is over-phase-splitting, the driver needs a series of manual operations to complete the process of over-phase separation, commonly known as bow over-phase separation. Along with the promotion of train speed and the excessive phase frequency, the driver's labor intensity is large or the manual response is too late to complete, and other measures must be adopted. Over-phase split system and its automatic over-phase split method” (application number 201310199444.8), the core of which is to compare the current measured by the current transformer connected in series near the electric segment on the catenary and the current transformer on the parallel branch of the electric segment , to determine the current status of the electric train and the position of the train to the electric split phase, and to close and disconnect the catenary 1 and catenary 2 with the neutral section through the normally open switch, so as to realize the automatic phase separation of the electric train. It is suitable for over-phase situations of electric trains that remain current-carrying before passing through the phase-split. If the electric train does not receive current before the phase separation, but needs to receive current when it reaches the neutral section. At this time, the two switches connected to the neutral section are in the off state, and the current transformer cannot detect the train passing signal. As a result, the train cannot receive current through the entire neutral section, and a power supply blind spot appears, reducing the speed and capacity of the train. At the same time, in this application, when the train in the sub-area is automatically phase-splitting, the switching action of two switches is still required, and the operation is relatively complicated.

Contents of the invention

The first object of the present invention is to provide an automatic phase separation system for electrified railway divisions. The number of operations is small, the structure and control are simple, and the automatic phase separation of electrified railway divisions can be realized more completely, safely and reliably.

The technical solution adopted by the present invention to realize its first invention purpose is, a kind of electrified railway sub-section automatically passes the phase separation system, comprises catenary one, catenary two, neutral section, and catenary one passes through electric subsection one and neutral section segment, catenary 2 is connected to the neutral segment through electrical segment 2, which is characterized in that:

The catenary one is connected in series with the current transformer one near the electric segment; the second current transformer and the normally open switch are connected in series and then connected in parallel on the electric segment one; the third current transformer and the second normally closed switch Connected in series and then connected in parallel to the second electrical segment;

A pantograph detector 1 is installed on the pillar of the current transformer, a pantograph detector 2 is installed on the pillar of the electric section 1, and a pantograph is installed on the pillar of the electric section 2 detector three;

The terminal of the catenary one is equipped with a ground-to-ground voltage transformer 1, and the terminal of the catenary 2 is equipped with a ground-to-ground voltage transformer 2;

The output ends of the first current transformer, the second current transformer, and the third current transformer, the output ends of the first pantograph detector, the second pantograph detector, and the third pantograph detector, the first voltage transformer, The output end of the voltage transformer two, the control ends of the normally open switch one and the normally closed switch two are all connected to the control unit; at the same time, the telecontrol device is also connected to the control unit.

The second object of the present invention is to provide a method for automatic phase separation of trains using the above-mentioned automatic phase separation system of electrified railway divisions.

The present invention realizes that the technical solution adopted by its second invention object is, a kind of method that uses the above-mentioned electrified railway division station to automatically pass the phase separation system to carry out the automatic phase separation of the train, and its method is:

A. The output voltages of voltage transformer 1 and voltage transformer 2 are both greater than or equal to the set threshold, and the voltage phase difference between voltage transformer 1 and voltage transformer 2 is less than the set threshold, then the control unit determines that the traction power supply system If the operation is normal, proceed to the following steps B, C and D for automatic over-phase operation; otherwise, proceed to step E;

B. When the current detected by current transformer 1, current transformer 2 and current transformer 3 is zero, and pantograph detector 1, pantograph detector 2 and pantograph detector 3 do not detect the When the pantograph passes by, the control unit determines that no electric train has entered the phase-splitting section, and does not perform any operation;

C. When the current detected by current transformer 1 is greater than zero and the current detected by current transformer 2 and current transformer 3 is equal to zero, or when pantograph detector 1 detects a pantograph passing by, the control unit determines that the electric train From the catenary one direction, the current transformer has passed through the electric segment and enters the neutral section, and the normally open switch is immediately controlled to close, so that the catenary and the neutral section are connected through the closed normally open switch. Catenary 1 and catenary 2 jointly supply power to the neutral section bilaterally;

Subsequently, within the set time interval after the normally open switch 1 is closed, the current direction measured by the current transformer 2 and the current transformer 3 is opposite, or the pantograph detector 2 detects that there is a pantograph passing by. The control unit judges that the electric train has passed through the electric section one and entered the neutral section, and immediately controls the normally open switch one to turn off. At this time, the neutral section is still connected to the catenary two, and the catenary two is connected to the neutral Otherwise, the control unit judges that the electric train stops between the current transformer 1 and the electric section 1, and the control unit transmits this information to the dispatching control system through the telecontrol device;

Then, within the set time interval after the normally open switch 1 is disconnected, when the current measured by the current transformer 3, the current transformer 1 and the current transformer 2 is all zero, or the pantograph detector 3 detects a When the pantograph passes, the control unit judges that the electric train leaves the phase separation area, and the automatic phase separation of the electric train from catenary 1 to catenary 2 ends; otherwise, the control unit judges that the electric train stops at the neutral section, and the control unit passes The telecontrol device transmits this information to the dispatching control system;

Finally, the currents measured by current transformer 1, current transformer 2, and current transformer 3 are all zero, and pantograph detector 1, pantograph detector 2, and pantograph detector 3 have not detected any The pantograph passes by, and the system waits for the next automatic over-phase operation;

D. When the current measured by current transformer 3 is greater than zero and the currents measured by current transformer 2 and current transformer 1 are both zero, or when the pantograph detector 3 detects that the pantograph passes by, the control unit determines the power The train drives through the electric segment 2 from the catenary 2 direction and enters the neutral section, and immediately controls the normally open switch 1 to close, so that the neutral section is connected to the catenary 1, and the catenary 1 and the catenary 2 are connected to both sides of the neutral section. powered by

Subsequently, within the set time interval after the normally open switch 1 is closed, the current direction measured by the current transformer 2 and the current transformer 1 is opposite, or the pantograph detector 2 detects the passing of the pantograph, and the control The unit determines that the electric train passes through the electric section 1 from the neutral section, and immediately controls the normally open switch to be disconnected; otherwise, the control unit determines that the electric train stops at the neutral section, and the control unit transmits this information to the dispatching control system through the telecontrol device ;

Finally, within the set time interval after the normally open switch 1 is disconnected, the currents measured by the current transformer 1, current transformer 2, and current transformer 3 are all zero, or the pantograph detector 1 detects the When the pantograph passes, the control unit judges that the electric train leaves the phase separation area, and the automatic phase separation of the electric train from catenary 2 to catenary 1 ends; Between section one, the control unit transmits this information to the dispatching control system through the telecontrol device;

Subsequently, the currents measured by current transformer 1, current transformer 2, and current transformer 3 were all zero, and pantograph detector 1, pantograph detector 2, and pantograph detector 3 did not detect any The pantograph passes by, and the system waits for the next automatic over-phase operation;

E. When the output voltage of voltage transformer 1 is lower than the set threshold value, the control unit determines that catenary 1 cannot supply power normally, and locks normally open switch 1 to make it in the disconnected state;

When the output voltage of voltage transformer 2 is lower than the set threshold, the control unit determines that a short-circuit fault has occurred in catenary 2, and locks normally open switch 1 to make it in the disconnected state

If the phase difference between the output voltage of voltage transformer 1 and the output voltage of voltage transformer 2 is greater than the set threshold, the control unit determines that there is an abnormal fault in the voltage phase of catenary 1 or catenary 2, and locks normally open switch 1 to make it in the disconnected state .

Compared with prior art, the beneficial effect of the present invention is:

One, the present invention utilizes the comparison of the current measured by the current transformer connected in series near the electric segment on the catenary and the current transformer on the parallel branch of the electric segment, that is, judge the train according to the current receiving condition of the electric train in each section Reach the position of the phase separation area; as a supplement, further use the pantograph detector installed on the pillar to detect whether there is a pantograph passing the detection point, when the electric train without current passes (the current transformer cannot detect the current), It can also detect the passing information of the electric train to ensure that the switch can be effectively closed and disconnected when the phase is over, so that the electric train can automatically pass the phase under various working conditions.

2. When the electric train enters the neutral section from the catenary one and is about to pass through the electric segment one, the normally open switch is closed to realize bilateral power supply from the catenary one and two to the neutral section. After entering the neutral section, it is immediately cut off Open the normally open switch to restore the unilateral power supply to the neutral section of the catenary two; After leaving the neutral section, disconnect the normally open switch and resume the unilateral power supply of the two-way neutral section of the catenary; the short-term bilateral power supply can reduce the impact on the power system, and each time the phase is separated, only one group of switches will operate. The number of actions is small, the structure and control are simple, and the electric train can completely and reliably realize the continuous power and automatic phase separation of the electric train in the partition.

3. The present invention uses the current transformer on the column and the pantograph detector, and does not use the ground position signal sensing device, so as to avoid the interference between the automatic over-phase system and other devices on the ground and the artificial damage on the ground, and the current mutual inductance When the pantograph fails, the pantograph detector can also judge the position of the train in the phase separation area, which improves the reliability of the system and better ensures the safe and good operation of the train.

4. The present invention can judge whether the electric train is parked in the phase separation area and the position of the electric train in the phase separation area, and can notify the dispatching control system through the telecontrol device in time, so as to dispatch or maintain the electric train, the train can be better guaranteed The operation is safe and reliable.

5. The present invention can detect the abnormal situation of the catenary power supply at both ends of the partition, and automatically lock the normally open switch to ensure that the normal catenary and the abnormal catenary will not be connected before the abnormal catenary is repaired, so as to avoid accidents Expansion can better ensure the safety and reliability of train operation.

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention on a catenary.

Fig. 2 is a schematic diagram of the control principle of the embodiment of the present invention.

Fig. 3 is a flow chart of measurement and control logic of the embodiment of the present invention.

detailed description

Example

Figures 1 and 2 show that a specific embodiment of the present invention is an automatic phase separation system for electrified railway divisions, including catenary one T1, catenary two T2, neutral section T0, and catenary one T1 through the electric Segment one S1 is connected to neutral segment T0, catenary two T2 is connected to neutral segment T0 through electric segment two S2, wherein: catenary one T1 is connected in series with current transformer one H1 near electric segment one S1; Current transformer two H2 and normally open switch one K1 are connected in series and then connected in parallel on electric segment one S1; current transformer three H3 and normally closed switch two K2 are connected in series and then connected in parallel on electric segment two S2; Pantograph Detector 1 V1 is installed on the pillar at H1 of Device 1, Pantograph Detector 2 V2 is installed on the pillar at S1 of Electric Section 1, and Pantograph Detector 2 is installed on the pillar at S2 of Electric Section 2 Detector 3 V3; the end of catenary 1 T1 is equipped with ground-to-ground voltage transformer 1 Y1, and the end of catenary 2 T2 is equipped with ground-to-ground voltage transformer 2 Y2; current transformer 1 H1, current transformer 2 H2, current transformer The output terminal of three H3, the output terminals of pantograph detector 1 V1, pantograph detector 2 V2, pantograph detector 3 V3, the output terminals of voltage transformer 1 Y1 and voltage transformer 2 Y2, usually The control ends of the first open switch K1 and the second normally closed switch K2 are connected to the control unit CU; at the same time, the remote control device YD is also connected to the control unit CU.

Fig. 1-3 shows, uses the above-mentioned electrified railway subdivision station to automatically pass the method for phase separation system to carry out train automatic phase separation, and its practice is:

A. The output voltages of voltage transformer one Y1 and voltage transformer two Y2 are greater than or equal to the set threshold, and the voltage phase difference output by voltage transformer one Y1 and voltage transformer two Y2 is less than the set threshold, then the control unit The CU determines that the traction power supply system is operating normally, and performs the following steps B, C, and D for automatic over-phase operation; otherwise, performs the step E operation;

During specific implementation, the set threshold value depends on the line conditions. Generally, the threshold voltage can be 15-19kV, and the threshold value of the voltage phase difference can be 10-20°.

B. When the current detected by current transformer one H1, current transformer two H2 and current transformer three H3 is zero, and pantograph detector one V1, pantograph detector two V2 and pantograph detector three When no pantograph is detected by V3, the control unit CU determines that no electric train has entered the phase separation interval, and does not perform any operation;

C. When the current detected by current transformer one H1 is greater than zero and the current detected by current transformer two H2 and current transformer three H3 is equal to zero, or when pantograph detector one V1 detects that a pantograph passes by, the control The unit CU determines that the electric train has passed the current transformer-H1 from the catenary-T1 direction and is about to enter the neutral section T0 through the electric segment-S1, and immediately controls the normally open switch-K1 to close, so that the catenary-T1 and the neutral section T0 is turned on through the closed normally open switch K1, and the neutral section T0 is supplied with bilateral power by catenary one T1 and catenary two T2;

Subsequently, within the set time interval after the normally open switch 1 K1 is closed, the current direction measured by the current transformer 2 H2 and the current transformer 3 H3 is opposite, or the pantograph detector 2 V2 detects a When the pantograph passes by, the control unit CU determines that the electric train has passed the electric segment S1 and enters the neutral segment T0, and immediately controls the normally open switch K1 to turn off. At this time, the neutral segment T0 is still connected to the contact line T2 If it is connected, the catenary 2 T2 supplies power to the neutral section T0 unilaterally; otherwise, the control unit CU determines that the electric train stops between the current transformer 1 H1 and the electric section 1 S1, and the control unit CU uses the telecontrol device YD to This information is transmitted to the dispatch control system;

Then, within the set time interval after the normally open switch K1 is disconnected, when the current measured by current transformer three H3, current transformer one H1, and current transformer two H2 is zero, or the pantograph detector When three V3 detects that a pantograph passes by, the control unit CU determines that the electric train leaves the phase separation area, and the automatic phase separation of the electric train from catenary one T1 to catenary two T2 ends; otherwise, the control unit CU determines that the electric train Stop at the neutral section T0, the control unit CU transmits this information to the dispatching control system through the telecontrol device YD;

Finally, the currents measured by current transformer one H1, current transformer two H2, and current transformer three H3 are all zero, pantograph detector one V1, pantograph detector two V2, pantograph detector three V3 No pantograph is detected, and the system waits for the next automatic over-phase operation;

D. When the current measured by current transformer 3 H3 is greater than zero and the current measured by current transformer 2 H2 and current transformer 1 H1 is zero, or when pantograph detector 3 V3 detects that the pantograph passes by, The control unit CU determines that the electric train passes through the electric segment S2 and enters the neutral segment T0 from the direction of the catenary 2 T2, and immediately controls the normally open switch K1 to close, so that the neutral segment T0 and the catenary T1 are connected, and the catenary One T1 and catenary two T2 jointly supply power to the neutral section T0 bilaterally

Subsequently, within the set time interval after the normally open switch 1 K1 is closed, the current direction measured by the current transformer 2 H2 and the current transformer 1 H1 is opposite, or the pantograph detector 2 V2 detects that the pantograph passes In the case of , the control unit CU determines that the electric train passes through the electric segment S1 from the neutral section T0, and immediately controls the normally open switch K1 to turn off; otherwise, the control unit CU determines that the electric train stops at the neutral section T0, and the control unit CU passes through The telecontrol device YD transmits this information to the dispatching control system;

Then, within the set time interval after the normally open switch one K1 is disconnected, the currents measured by the current transformer one H1, the current transformer two H2, and the current transformer three H3 are all zero, or the pantograph detector When one V1 detects the passing of the pantograph, the control unit CU judges that the electric train leaves the phase separation area, and the automatic phase separation of the electric train from catenary two T2 to catenary one T1 ends; otherwise, the control unit CU judges that the electric train Stop between the current transformer one H1 and the electric section one S1, the control unit CU transmits this information to the dispatching control system through the telecontrol device YD;

Finally, the currents measured by current transformer one H1, current transformer two H2, and current transformer three H3 are all zero, pantograph detector one V1, pantograph detector two V2, pantograph detector three V3 No pantograph is detected, and the system waits for the next automatic over-phase operation;

E. When the output voltage of the voltage transformer-Y1 is lower than the set threshold, the control unit CU determines that the catenary-T1 cannot supply power normally, and locks the normally open switch-K1 to make it in the disconnected state;

When the output voltage of voltage transformer 2 Y2 is lower than the set threshold, the control unit CU determines that a short-circuit fault occurs in catenary 2 T2, and locks the normally open switch 1 K1 to make it in the disconnected state

The phase difference between the output voltage of voltage transformer 1 Y1 and the output voltage of voltage transformer 2 Y2 is greater than the set threshold, the control unit CU determines that the voltage phase of catenary 1 T1 or catenary 2 T2 is abnormal, and locks the normally open switch 1 K1. leave it disconnected.

During the concrete implementation of the present invention, the setting time interval in C, D two steps is usually the minimum interval time of two adjacent trains on the line.

In order to reduce the catenary segmentation, the current transformer-H1 can be selected as a clamp-type current transformer when the present invention is implemented. The shunt relation outputs the electric train current of the contact wire.

Claims (2)

1. an electric railway subregion institute automatic neutral-section passing system, including contact net one (T1), contact net two (T2), neutral section (T0), contact net one (T1) is connected with neutral section (T0) by electricity segmentation one (S1), contact net two (T2) is connected with neutral section (T0) by electricity segmentation two (S2), it is characterised in that:

Described contact net one (T1) is sealing in current transformer one (H1) near electricity segmentation one (S1) place; It is then parallelly connected with on electricity segmentation one (S1) after current transformer two (H2) and normal open switch one (K1) concatenation; It is then parallelly connected with on electricity segmentation two (S2) after current transformer three (H3) and normally closed switch two (K2) concatenation;

The pillar at described current transformer one (H1) place is provided with pantograph survey meter one (V1), the pillar at electricity segmentation one (S1) place is provided with pantograph survey meter two (V2), the pillar at electricity segmentation two (S2) place is provided with pantograph survey meter three (V3);

The end of described contact net one (T1) is provided with voltage-to-ground transformer one (Y1), and contact net two (T2) end is provided with voltage-to-ground transformer two (Y2);

Described current transformer one (H1), current transformer two (H2), current transformer three (H3) outfan, pantograph survey meter one (V1), pantograph survey meter two (V2), pantograph survey meter three (V3) outfan, voltage transformer one (Y1), voltage transformer two (Y2) outfan, the control end of normal open switch one (K1) and normally closed switch two (K2) is all connected with control unit (CU);Telemechanical apparatus (YD) is also connected with control unit (CU) simultaneously.

2. using the method that the electric railway subregion institute automatic neutral-section passing system described in claim 1 carries out automatic passing over of neutral section, its practice is:

The voltage that A, voltage transformer one (Y1) and voltage transformer two (Y2) export is all higher than being equal to the threshold value set, and the voltage phase difference that voltage transformer one (Y1) and voltage transformer two (Y2) export is less than the threshold value set, then control unit (CU) judges tractive power supply system normal operation, carries out the automatic passing over of neutral section operation of following B, C, D step; Otherwise, E step operation is carried out;

B, the electric current detected when current transformer one (H1), current transformer two (H2) summation current transformer three (H3) are zero, and pantograph survey meter one (V1), pantograph survey meter two (V2) and pantograph survey meter three (V3) all do not detect pantograph through out-of-date, control unit (CU) judges do not have power train to sail between phase-separating section, does not carry out any operation;

C, the electric current detected when current transformer one (H1) is more than zero and current transformer two (H2), the electric current that current transformer three (H3) detects is equal to zero, or pantograph survey meter one (V1) is detected with pantograph through out-of-date, control unit (CU) judges that power train has traveled past current transformer one (H1) and is about to enter neutral section (T0) through electricity segmentation one (S1) from contact net one (T1) direction, control normal open switch one (K1) Guan Bi at once, contact net one (T1) is made to be connected by the normal open switch one (K1) closed with neutral section (T0), common to neutral section (T0) two-side feeding by contact net one (T1) and contact net two (T2), if now train is flowed, the size of current that then current transformer two (H2) summation current transformer three (H3) is measured is equal, direction is identical,

Subsequently, in setting interval after normal open switch one (K1) closes, the situation that current transformer two (H2) summation current transformer three (H3) sense of current measured is contrary occurs, or occur that pantograph survey meter two (V2) is detected with the situation of pantograph process, control unit (CU) then judges that power train has traveled past electricity segmentation one (S1) and enters neutral section (T0), control normal open switch one (K1) at once to disconnect, now neutral section (T0) is still connected with contact net two (T2), by contact net two (T2) to neutral section (T0) single side feeding, otherwise, control unit (CU) judges that power train is parked between current transformer one (H1) and electricity segmentation one (S1), and this information is passed to Dispatching Control System by telemechanical apparatus (YD) by control unit (CU),

Then, in setting interval after normal open switch one (K1) disconnects, the electric current measured when current transformer three (H3) and current transformer one (H1), current transformer two (H2) be zero or pantograph survey meter three (V3) be detected with pantograph through out-of-date, control unit (CU) judges that power train sails out of phase-separating section, and the automatic passing over of neutral section that power train is driven towards contact net two (T2) by contact net one (T1) terminates; Otherwise, control unit (CU) judges that power train is parked in neutral section (T0), and this information is passed to Dispatching Control System by telemechanical apparatus (YD) by control unit (CU);

Finally, the electric current that current transformer one (H1), current transformer two (H2), current transformer three (H3) are measured is zero, pantograph survey meter one (V1), pantograph survey meter two (V2), pantograph survey meter three (V3) are not all detected with pantograph process, and system waits automatic passing over of neutral section operation next time;

D, the electric current measured when current transformer three (H3) is more than zero and current transformer two (H2), the electric current that current transformer one (H1) is measured is zero, or pantograph survey meter three (V3) detects pantograph through out-of-date, control unit (CU) judges that power train crosses electricity segmentation two (S2) and enters neutral section (T0) from contact net two (T2) direction, control normal open switch one (K1) Guan Bi at once, neutral section (T0) is made to connect with contact net one (T1), common to neutral section (T0) two-side feeding by contact net one (T1) and contact net two (T2),

Subsequently, in setting interval after normal open switch one (K1) closes, occur that the sense of current that current transformer two (H2) summation current transformer one (H1) is measured is contrary, or pantograph survey meter two (V2) detects the situation of pantograph process, control unit (CU) judges that power train crosses electricity segmentation one (S1) from neutral section (T0), controls normal open switch one (K1) at once and disconnects; Otherwise, control unit (CU) judges that power train is parked in neutral section (T0), and this information is passed to Dispatching Control System by telemechanical apparatus (YD) by control unit (CU);

Then, in setting interval after normal open switch one (K1) disconnects, occur the electric current that current transformer one (H1) and current transformer two (H2), current transformer three (H3) are measured be zero or pantograph survey meter one (V1) detect the situation of pantograph process, control unit (CU) judges that power train sails out of phase-separating section, and the automatic passing over of neutral section that power train is driven towards contact net one (T1) by contact net two (T2) terminates; Otherwise, control unit (CU) judges that power train is parked between current transformer one (H1) and electricity segmentation one (S1), and this information is passed to Dispatching Control System by telemechanical apparatus (YD) by control unit (CU);

Finally, the electric current that current transformer one (H1), current transformer two (H2), current transformer three (H3) are measured is zero, pantograph survey meter one (V1), pantograph survey meter two (V2), pantograph survey meter three (V3) are not all detected with pantograph process, and system waits automatic passing over of neutral section operation next time;

When the voltage that E, voltage transformer one (Y1) export is lower than the threshold value set, control unit (CU) judges that contact net one (T1) can not normal power supply, locking normal open switch one (K1) so that it is be off;

The voltage that voltage transformer two (Y2) exports lower than set threshold value time, control unit (CU) judge contact net two (T2) can not normal power supply, locking normal open switch one (K1) so that it is be off;

The phase contrast of voltage transformer one (Y1) output voltage and voltage transformer two (Y2) output voltage is more than the threshold value set, it is abnormal that control unit (CU) judges that contact net one (T1) or contact net two (T2) voltage-phase occur, locking normal open switch one (K1) so that it is be off.