CN102355056B - Method for improving closing reliability of remote-terminal-unit-architecture-based substation - Google Patents
Method for improving closing reliability of remote-terminal-unit-architecture-based substation Download PDFInfo
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Abstract
The invention discloses a method for improving the closing reliability of a remote-terminal-unit-architecture-based substation. An integrated power dispatching automation system consists of a monitoring dispatching center master station and an unattended slave substation adopting a remote terminal unit architecture. The monitoring dispatching center master station and the unattended slave substation perform information exchange by a network. The conventional remote-terminal-unit-architecture-based unattended substation has the shortcomings of reclosing failures, false reclosing starting, fault signaling loss and reclosing remote signaling and remote control information distortion. By the method, the reliability of closing operations of the remote-terminal-unit-architecture-based unattended substation is improved by the improved designs of a secondary protection loop of a line control loop and a remote loop of the substation in combination with dual-'time window' and 'secondary checking' processing technologies for the mechanical and electrical characteristics of a closing relay and closing remote signaling and remote control signals.
Description
Technical field
The invention belongs to the Automatization Technology in Transformer Substation field, refer to especially promote the method for remote terminal unit framework unattended operation transformer station combined floodgate reliability.
Background technology
Since the nineties in 20th century, the unattended operation transformer station comprehensive automation that continues to advance is the key target for investment of China's power industry all the time, annual approximately have newly-built or unattended operation transformer station reconstruction of 1000-1500 seat to put into operation, and sum reaches the extensive newly-built and reconstruction project of the transformer station of 25000 and entered the ending stage.Building unattended operation transformer station is the needs of power industry self-growth, making so of market and user's request especially: at first, modern industry, especially new high-tech industry, increasingly strict to indexs such as the magnitude of voltage of electric energy, frequency, ripple coefficient, power supply continuities; The second, it is that the indispensable important technology of electric power enterprise safe and highly efficient operation supports; At last, unattended operation transformer station helps the personnel reduction and enlargement of power industry.The main operation that transformer station relates to has: 1) the closing of electric power system, Open Loop Operation; 2) isolator operation; 3) line loop operation; 4) transformer operating; 5) bus grid switching operation; 6) line loop operation; 7) impact closing operation; 8) solution of electric power system, parallel operation; 9) zero raising voltage operation; 10) bypass replacement operation.Obviously, closing operation is the most basic key operation of transformer station, and the reliability of closing operation is directly connected to the quality of transformer station's O﹠M quality.
The most configure dedicated computer line protection of newly-built unattended operation transformer station measure and control device, typical products have the serial measure and control device etc. of protecting of RCS-9000 of Nan Rui company, and the closing operation of this type of transformer station has good reliability.The unattended operation reconstruction project of Attended mode transformer station adopts remote terminal (Remote Terminal Units in a large number, be called for short RTU) solution, the advantage of remote terminal solution is: technical cost is suitable, can protect to greatest extent the original huge investment of Attended mode transformer station, make the existing equipment of Attended mode transformer station continue to be fully used; On the other hand, the RTU solution is agreed with the state of the art that the power industry O﹠M ensures very much, can realize that Attended mode transformer station is to unattended smoothing technique transition.Although province and district, county's electric power dispatching integrated automation systems at different levels have different functions and responsibility, but the Technical Architecture of remote terminal solutions at different levels and form basic identical: generally be comprised of monitoring and scheduling central master station and unmanned value transformer station slave station, monitoring and scheduling central master station and nobody value transformer station slave station carry out information exchange by network; Remote terminal unit is arranged on unmanned value transformer station slave station, gather analog quantity and the digital quantity of place substation operation state, monitor and transmit above-mentioned analog quantity and digital quantity to the monitoring and scheduling center, carrying out simultaneously control and dispatching command that transformer station is mail at the monitoring and scheduling center.
The unattended operation transformer station of remote terminal unit Technical Architecture has obtained the approval of electric power enterprise, but the existing RTU solution deficiency that also exposes in service--statistics shows: based on the unattended operation transformer station of remote terminal unit Technical Architecture, its closing operation reliability is demanded further raising urgently, and the reliability of closing operation is directly connected to the quality of transformer station's O﹠M quality.Occupy the leading position of present power industry in view of remote terminal unit framework unattended operation transformer station, and the reasonable time in will play a part very importantly, therefore be very necessary towards the unattended operation transformer station of remote terminal unit framework, innovative and functional technique technology and the method that exploitation promotes the combined floodgate reliability.The present invention is by the improvement design to transformer station circuit control loop second protection loop and telemechanical loop; in conjunction with the signal processing technology for closing relay mechanical electric characteristic and combined floodgate remote signalling remote control, promote the reliability of remote terminal unit framework unattended operation transformer station closing operation.
Summary of the invention
The objective of the invention is to overcome the deficiency of remote terminal unit framework unattended operation transformer station design, a kind of technology and method that promotes the engineering reliability of remote terminal unit framework unattended operation transformer station combined floodgate reliability is provided.The present invention starts with from two approach and promotes the combined floodgate reliability: towards unattended operation transformer station, transformation affects the second power equipment of transformer station's combined floodgate reliability; Have electric power dispatching integrated automation system in mind, adopt the signal processing technology that reduces the wrong report of combined floodgate remote signalling remote signal or rate of failing to report.In other words; by improving the design in transformer station circuit control loop second protection loop and telemechanical loop; and in conjunction with two " time window " and " secondary check " treatment technologies for closing relay mechanical electric characteristic and combined floodgate remote signalling remote signal, the step that promotes remote terminal unit framework unattended operation transformer station closing operation reliability is as follows:
1) unattended operation transformer station is set up two-position relay JSW from stand in former trip(ping) circuit, wherein, one end of two-position relay JSW coil 1 is connected with the closing relay YHJ far away of remote terminal unit, the contact 8 of KK switch, the positive pole of diode D1, one end of two-position relay JSW coil 2 is connected with the tripping relay YTJ far away of remote terminal unit, the contact 7 of KK switch, the positive pole of diode D2, is connected with the end of fuse 2RD after the other end parallel connection of two-position relay JSW coil 1 and coil 2, respectively set up diode D1, a D2 former in closing trip(ping) circuit, wherein, the negative pole of diode D1 is connected with the end of brace QP, two normally-closed contacts of anti-trip relay TBJ and an end of a normally opened contact, and the negative pole of diode D2 is connected with an end of anti-trip relay TBJ current coil, protective circuit, be connected in series a secondary normally closed contact 2 in the contact 6 of the multiple switching relay ZCH of the charge circuit of former multiple switching relay with jumping between the relay TWJ of position, on the charge circuit KK of former multiple switching relay switch 21-23 contact and connect a secondary normal opened contact 1 ', be connected in series a secondary normally closed contact 1 between the contact 15 of the multiple switching relay ZCH of the discharge loop of former multiple switching relay and charge circuit KK switch contact 2, on the discharge loop KK switch 2-4 contact of former multiple switching relay and connect a secondary normal opened contact 2 ', on former accident signal loop with the 1-3 of secondary normal opened contact 1 a 〞 short circuit KK switch, the 19-17 contact,
2) the unattended operation transformer station slave station carries out two " time window " processing to the combined floodgate remote signals: for deciliter position signalling of switch, disconnecting link, also reserve corresponding allowance the operate time of actual measurement switch, disconnecting link, " time window " stand-by period of 2S is set on remote terminal unit software, avoid the intermediate state when switch, disconnecting link are taken action the centre position to occur, can eliminate again contact bounce and disturb; When the monitoring and scheduling center receives the combined floodgate remote signals, also adopt " time window " signal processing technology: find that the remote signalling displacement is with its record, with its time limit parameter timing; Being 0 o'clock at timer, again reading remote signalling information, if displacement occurs again in remote signalling, is false remote signalling, ignores; Otherwise timer is 0 o'clock, again reads remote signalling information, if displacement does not occur in remote signalling, remote signalling is true displacement; The signal processing technology of two " time windows " can effectively reduce communication channel to the interference of combined floodgate remote signals;
3) the unattended operation transformer station slave station carries out " secondary check " processing to the combined floodgate remote signal: at first the monitoring and scheduling central master station issues remote control and presets order, based on " check " security mechanism, carry out remote control by the unattended operation transformer station slave station and preset the check of order and presetting of guidance command, and result is returned to the monitoring and scheduling central master station, monitoring and scheduling central master station that and if only if receives that " checking correct " just enters remote control and carry out flow process, otherwise monitoring and scheduling central master station repeating transmission remote control is preset order or entered the error handling processing flow process; In case the monitoring and scheduling central master station receives that the slave station combined floodgate remote control of unmanned value transformer station presets order and " check correctly ", the dispatcher issues the remote control fill order, send the combined floodgate fill order to the unmanned transformer station's slave station that is worth, fill order sends simultaneously with positive and inverse code, nobody value transformer station's slave station " secondary check " closes a floodgate and orders, and moves when the order check is correct again--close a floodgate; After the combined floodgate remote control was carried out, unmanned value transformer station slave station was uploaded switch changed position information, after the monitoring and scheduling central master station is received the displacement signal of (being generally 10s) this remotely-controlled object at the appointed time, and display remoting success or show failure and enter the error handling processing flow process.
The present invention compares with background technology, and the beneficial effect that has is:
The reliability of closing operation is related to the quality of transformer station's O﹠M quality.At present, based on the unattended operation transformer station of remote terminal unit Technical Architecture, its closing operation reliability is demanded further raising urgently.The present invention is towards transformer station, and transformation affects the second power equipment of transformer station's combined floodgate reliability; Base oneself upon electric power dispatching integrated automation system, exploitation reduces the signal processing technology of the wrong report of combined floodgate remote signalling remote signal or rate of failing to report.The transformation of so-called converting station electric power secondary device; it is the improvement design in transformer station circuit control loop second protection loop and telemechanical loop; for be the deficiency that exists in existing remote terminal unit framework unattended operation transformer station main flow design, improve design with strong points, expense is limited, be widely used.So-called combined floodgate remote signalling remote signal treatment technology, not only taken into full account the intrinsic mechanical electric characteristic of closing relay, and drawn artificial local combined floodgate operation for many years effective " two tickets three system " experience, method is simple, effect is remarkable, without extra expenses.
Description of drawings
Fig. 1 is the system architecture diagram of remote terminal unit framework unattended operation transformer station;
Fig. 2 is the 10kV circuit control loop schematic diagram of remote terminal unit framework unattended operation transformer station;
Fig. 3 is the improved 10kV circuit of remote terminal unit framework unattended operation transformer station control loop schematic diagram;
Fig. 4 is the schematic diagram of two-position relay JSW;
Fig. 5 is the flow chart that combined floodgate remote signal " secondary check " is processed.
Embodiment
As shown in Figure 1, the scheduling complex automatic system of Zhejiang Province county remote terminal unit framework unattended operation transformer station is by 21 transformer stations, and 1 monitoring and scheduling center forms; Wherein 500 kV transformer station is 1,220 2, kV transformer stations, 110 18, kV transformer stations, 10 176 of kV switching stations; Both carry out information exchange by fiber optic network, and IEC 61850 transmission protocols are followed in communication.
As shown in Figure 2, in existing remote terminal unit framework unattended operation transformer station design of secondary line, extensively adopt DH3 type multiple switching relay in 10kV feeder line reclosure loop reform, not corresponding states by the position after circuit breaker trip and the KK position of the switch is closed a floodgate voluntarily, i.e. the coincidence function that discharges and recharges to complete line-breaker by relay internal capacitor element; In figure: HQ is closing coil, and TQ is switching winding, and ZCH is multiple switching relay, and TBJ is anti-trip relay, and JSJ is for accelerating to continue device, and TWJ is for jumping the position relay, and XJ is signal relay.Closing circuit is comprised of KK switch, TBJ anti-trip relay, auxiliary switch DL, HQ closing coil etc.Reclosing starting: when the KK switch during in " after closing a floodgate " position, KK control switch 21-23 junction closure and the 2-4 contact is opened, multiple switching relay charging, the coincidence preparatory condition of line-breaker during for the circuit transient fault.Reclosing discharge (inefficacys): when the KK switch during in " after tripping operation " position, the 2-4 junction closure of KK switch and the 21-23 contact is opened, multiple switching relay discharges, the disabler of 10kV feeder line reclosing.The remote power feeding system of the unattended operation remote terminal unit modification scheme of Attended mode transformer station, its remote control part every road remote control all contains a closing relay far away (YHJ) and a tripping relay far away (YTJ), the far away jumping has a pair of contact for the multiple switching relay discharge in relay, but is not equipped with the reclosing block relay.
There are 5 problems to be solveds in existing combined floodgate circuit control loop reliability, now is discussed below one by one.Problem 1: when substation field KK switch is in " after closing a floodgate " position, 21-23 junction closure, reclosing (startup loop) conducting this moment; After the remote control switch separating brake, reclosing (startup loop) still is in conducting state, starting recloser; There is the possibility of reclosing misoperation after the remote control switch separating brake.Problem 2: when substation field KK switch was in " after closing a floodgate " position, the 2-4 contact disconnected, and reclosing this moment (discharge loop) disconnects; After the remote control switch separating brake, reclosing (discharge loop) still is in off-state, and the reclosing executive component starts; There is the possibility of reclosing misoperation after the remote control switch separating brake.Problem 3: when substation field KK switch was in " after separating brake " position, the 21-23 contact disconnected, and reclosing this moment (startup loop) disconnects; After remote control switch closed a floodgate, reclosing (startup loop) still was in off-state, the possibility that exists reclosing to lose efficacy.Problem 4: when substation field KK switch is in " after separating brake " position, 2-4 junction closure, reclosing (discharge loop) conducting this moment; After remote control switch closed a floodgate, reclosing (discharge loop) still was in conducting state; The possibility that exists reclosing to lose efficacy.Problem 5: substation field KK switch is in " after separating brake " position, and the 1-3 contact disconnects, and the 17-19 contact disconnects, and after remote control switch closed a floodgate, accident signal lost efficacy, the possibility that exists RTU accident resultant signal to lose.For addressing the above problem, a kind of method that promotes remote terminal unit framework unattended operation transformer station combined floodgate reliability is as follows:
1) improved 10kV circuit control loop schematic diagram as shown in Figure 3, with dashed lines mark in improvement place figure.improvement place is included in unattended operation transformer station and sets up two-position relay JSW from stands in former trip(ping) circuit, wherein, one end of two-position relay JSW coil 1 is connected with the closing relay YHJ far away of remote terminal unit, the contact 8 of KK switch, the positive pole of diode D1, one end of two-position relay JSW coil 2 is connected with the tripping relay YTJ far away of remote terminal unit, the contact 7 of KK switch, the positive pole of diode D2, is connected with the end of fuse 2RD after the other end parallel connection of two-position relay JSW coil 1 and coil 2, respectively set up diode D1, a D2 former in closing trip(ping) circuit, wherein, the negative pole of diode D1 is connected with the end of brace QP, two normally-closed contacts of anti-trip relay TBJ and an end of a normally opened contact, and the negative pole of diode D2 is connected with an end of anti-trip relay TBJ current coil, protective circuit, be connected in series a secondary normally closed contact 2 in the contact 6 of the multiple switching relay ZCH of the charge circuit of former multiple switching relay with jumping between the relay TWJ of position, on the charge circuit KK of former multiple switching relay switch 21-23 contact and connect a secondary normal opened contact 1 ', be connected in series a secondary normally closed contact 1 between the contact 15 of the multiple switching relay ZCH of the discharge loop of former multiple switching relay and charge circuit KK switch contact 2, on the discharge loop KK switch 2-4 contact of former multiple switching relay and connect a secondary normal opened contact 2 ', on former accident signal loop with the 1-3 of secondary normal opened contact 1 a 〞 short circuit KK switch, the 19-17 contact.
Combined floodgate circuit control loop after improvement efficiently solves the problem that former combined floodgate circuit control loop exists, and has promoted the reliability of unattended operation transformer station closing operation.When substation field KK switch is in " after closing a floodgate " position, introduce the auxiliary normally closed contact 2 of two-position relay JSW in transformer station's reclosing circuit control loop after improvement, after switch remote control separating brake, the auxiliary normally closed contact 2 of JSW disconnects, the starting recloser loop disconnects, eliminate reclosing misoperation after the remote control switch separating brake, solved the problem 1 that former combined floodgate circuit control loop exists.When substation field KK switch is in " after closing a floodgate " position, transformer station's auxiliary normally closed contact 1 contact of reclosing circuit control loop introducing two-position relay JSW after improvement and normal opened contact 2 ', after switch remote control separating brake, JSW assists normally closed contact 1 junction closure (involution), normal opened contact 2 ' closure, reclosing misoperation after the remote control switch separating brake has been eliminated in multiple switching relay discharge, has solved the problem 2 that former combined floodgate circuit control loop exists.When substation field KK switch is in " after separating brake " position, the auxiliary normal opened contact 1 of the reclosing circuit control loop introducing two-position relay JSW of transformer station after improvement ', when the switch remote control is closed a floodgate, JSW assists normal opened contact 1 ' closure, the starting recloser loop is connected, after having eliminated the remote control switch combined floodgate, reclosing lost efficacy, and had solved the problem 3 that former combined floodgate circuit control loop exists.When substation field KK switch is in " after separating brake " position, transformer station's reclosing circuit control loop after improvement is introduced the auxiliary normally closed contact 1 of two-position relay JSW, when the switch remote control is closed a floodgate, the auxiliary normally closed contact 1 of JSW disconnects, the reclosing discharge loop disconnects, after having eliminated the remote control switch combined floodgate, reclosing lost efficacy, and had solved the problem 4 that former combined floodgate circuit control loop exists.When substation field KK switch is in " after separating brake " position, auxiliary normal opened contact 1 〃 of substation accident audible alarm loop introducing two-position relay JSW after improvement, when the switch remote control is closed a floodgate, auxiliary normal opened contact 1 〃 of JSW is closed, reinstate the accident signal alarm circuit, solved the problem 5 that former combined floodgate circuit control loop exists.
The principle of two-position relay as shown in Figure 4.During combined floodgate: coil 1 excitation, contact 1,1 ' and 1 〞 (having used second mate Chang Kai 1 ' and 1 〞 here, secondary normally closed 1) action and self-sustaining simultaneously.During separating brake: coil 2 excitations, coil 1 returns simultaneously, contact 2 and 2 ' (used here a pair often open 2 ', one secondary normally closed 2) action and self-sustaining simultaneously, until coil 1 again excitation just return.
2) contact bounce of closing relay is that inevitably relay tip loose contact or shake can cause the defeated people's signal of RTU inaccurate; Because the network channel characteristic is undesirable, the transmission of remote motion signal easily produces distortion; Therefore the unattended operation transformer station slave station carries out two " time window " processing to the combined floodgate remote signals: for deciliter position signalling of switch, disconnecting link, also reserve corresponding allowance the operate time of actual measurement switch, disconnecting link, " time window " stand-by period of 2S is set on remote terminal unit software, avoid the intermediate state when switch, disconnecting link are taken action the centre position to occur, can eliminate again contact bounce and disturb; When the monitoring and scheduling center receives the combined floodgate remote signals, also adopt " time window " signal processing technology: find that the remote signalling displacement is with its record, with its time limit parameter timing; Before timer is 0, again read remote signalling information, if displacement occurs again in remote signalling, be false remote signalling, ignore; Otherwise timer is 0 o'clock, again reads remote signalling information, if displacement does not occur in remote signalling, remote signalling is true displacement; The signal processing technology of two " time windows " can effectively reduce communication channel to the interference of combined floodgate remote signals.
The unattended operation transformer station slave station carries out flow process that " secondary check " process as shown in Figure 5 to the combined floodgate remote signal.The monitoring and scheduling central master station is carried out remote operation and is divided into two steps enforcements: at first the monitoring and scheduling central master station issues remote control and presets order, based on " check " security mechanism, carry out remote control by the unattended operation transformer station slave station and preset the check of order and presetting of guidance command, and result is returned to the monitoring and scheduling central master station, monitoring and scheduling central master station that and if only if receives that " checking correct " just enters remote control and carry out flow process, otherwise monitoring and scheduling central master station repeating transmission remote control is preset order or entered the error handling processing flow process; In case the monitoring and scheduling central master station receives that the slave station combined floodgate remote control of unmanned value transformer station presets order and " check correctly ", the dispatcher issues the remote control fill order, send the combined floodgate fill order to the unmanned transformer station's slave station that is worth, fill order sends simultaneously with positive and inverse code, nobody value transformer station's slave station " secondary check " closes a floodgate and orders, and moves when the order check is correct again--close a floodgate; After the combined floodgate remote control was carried out, unmanned value transformer station slave station was uploaded switch changed position information, after the monitoring and scheduling central master station is received the displacement signal of (being generally 10s) this remotely-controlled object at the appointed time, and display remoting success or show failure and enter the error handling processing flow process.
Claims (1)
1. one kind based on remote terminal unit framework unattended operation transformer station slave station closing switch method, it is characterized in that its step is as follows:
1) unattended operation transformer station is set up two-position relay JSW from stand in former trip(ping) circuit, wherein, one end of two-position relay JSW coil 1 is connected with the contact 8 of closing relay YHJ far away, the K switch K of remote terminal unit, the positive pole of diode D1, one end of two-position relay JSW coil 2 is connected with the contact 7 of tripping relay YTJ far away, the K switch K of remote terminal unit, the positive pole of diode D2, and the other end of two-position relay JSW coil 1 and coil 2 is connected with the end of fuse 2RD after connecting, respectively set up diode D1, a D2 former in closing trip(ping) circuit, wherein, the negative pole of diode D1 is connected with the end of brace QP, two normally-closed contacts of anti-trip relay TBJ and an end of a normally opened contact, and the negative pole of diode D2 is connected with an end of anti-trip relay TBJ current coil, protective circuit, be connected in series a secondary normally closed contact 2 in the contact 6 of the multiple switching relay ZCH of the charge circuit of former multiple switching relay with jumping between the relay TWJ of position, charge circuit K switch K21 at former multiple switching relay, on 23 contacts and connect a secondary normal opened contact 1 ', be connected in series a secondary normally closed contact 1 between the contact 15 of the multiple switching relay ZCH of the discharge loop of former multiple switching relay and charge circuit K switch K contact 2, the discharge loop K switch K2 of former multiple switching relay, on 4 contacts and connect a secondary normal opened contact 2 ', on former accident signal loop with 1 of secondary normal opened contact 1 a 〞 shorting switch KK, 3, 19, 17 contacts,
2) the unattended operation transformer station slave station carries out two " time window " processing to the combined floodgate remote signals: for deciliter position signalling of switch, disconnecting link, also reserve corresponding allowance the operate time of actual measurement switch, disconnecting link, " time window " stand-by period of 2S is set on remote terminal unit software, avoid the intermediate state when switch, disconnecting link are taken action the centre position to occur, can eliminate again contact bounce and disturb; When the monitoring and scheduling center receives the combined floodgate remote signals, also adopt " time window " signal processing technology: find that the remote signalling displacement is with its record, with its time limit parameter timing; Being 0 o'clock at timer, again reading remote signalling information, if displacement occurs again in remote signalling, is false remote signalling, ignores; Otherwise timer is 0 o'clock, again reads remote signalling information, if displacement does not occur in remote signalling, remote signalling is true displacement; The signal processing technology of two " time windows " can effectively reduce communication channel to the interference of combined floodgate remote signals;
3) the unattended operation transformer station slave station carries out " secondary check " processing to the combined floodgate remote signal: at first the monitoring and scheduling central master station issues remote control and presets order, based on " check " security mechanism, carry out remote control by the unattended operation transformer station slave station and preset the check of order and presetting of guidance command, and result is returned to the monitoring and scheduling central master station, monitoring and scheduling central master station that and if only if receives that " checking correct " just enters remote control and carry out flow process, otherwise monitoring and scheduling central master station repeating transmission remote control is preset order or entered the error handling processing flow process; In case the monitoring and scheduling central master station receives that the slave station combined floodgate remote control of unmanned value transformer station presets order and " check correctly ", the dispatcher issues the remote control fill order, send the combined floodgate fill order to the unmanned transformer station's slave station that is worth, fill order sends simultaneously with the code radix-minus-one complement, nobody value transformer station's slave station " secondary check " closes a floodgate and orders, and moves when the order check is correct again--close a floodgate; After the combined floodgate remote control was carried out, unmanned value transformer station slave station was uploaded switch changed position information, after the monitoring and scheduling central master station is received the displacement signal of this remotely-controlled object at the appointed time, and display remoting success or show failure and enter the error handling processing flow process.
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| CN102638098A (en) * | 2012-03-31 | 2012-08-15 | 上海市电力公司 | Telecontrol switching reclosing automation system |
| CN103384084A (en) * | 2012-05-04 | 2013-11-06 | 苏州工业园区新宏博通讯科技有限公司 | Long-distance automatic reclosure communication system |
| CN102810853A (en) * | 2012-07-26 | 2012-12-05 | 成都普创通信技术股份有限公司 | Grounding device for contact rail and control method |
| CN103904610B (en) * | 2014-04-21 | 2016-08-31 | 国家电网公司 | Portable line protective devices |
| CN104049619B (en) * | 2014-06-30 | 2017-03-29 | 北京煜能电气有限公司 | The switching device remote monitoring terminal that a kind of remote control, remote signalling loop share |
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