Control and acquisition circuit of high-voltage electric disconnector

Abstract

The present application belongs to the technical field of control of high-voltage electric disconnecting switch in transformer substation, and particularly relates to a control and acquisition circuit of high-voltage electric disconnecting switch. The circuit realizes the remote signaling process by transmitting the disconnecting position signal to the disconnecting-in port of the relay protection device through the remote signaling second cable and transmitting the closing position signal to the closing-in port of the relay protection device through the remote signaling first cable. The circuit realizes the remote control process by transmitting the signal of the closing positive terminal and the disconnecting negative terminal to the closing positive terminal and the disconnecting negative terminal of the high-voltage electric disconnecting switch through the remote control first cable and transmitting the signal of the closing negative terminal and the disconnecting positive terminal to the closing negative terminal and the disconnecting positive terminal of the high-voltage electric disconnecting switch through the remote control second cable. The remote signaling first cable and the remote control first cable are the same cable, and the remote signaling second cable and the remote control second cable are the same cable. That is, the remote control and remote signaling processes are realized by using at most two cables, thereby reducing the cost.

Description

Technical Field

[0001] This invention belongs to the field of high-voltage electric disconnect switch control technology in substations, and specifically relates to a control and data acquisition circuit for a high-voltage electric disconnect switch. Background Technology

[0002] Power system relay protection equipment is an automatic device that quickly and accurately trips circuit breakers or sends signals when electrical components in a power system malfunction or operate abnormally. Remote control of high-voltage electrically operated disconnect switches in substations via relay protection equipment is a common remote operation method.

[0003] The physical distance between relay protection equipment and remote high-voltage electric disconnect switches is often tens of kilometers. The conventional wiring for remote control and signaling signals between the relay protection equipment and the remote high-voltage electric disconnect switches is as follows: Figure 1 As shown. While the current conventional design method satisfies the functions of remote control output and remote signaling acquisition, the 7-wire system between the relay protection equipment and the remote high-voltage electric disconnect switch requires users to lay long cables, resulting in a relatively high overall cost. Summary of the Invention

[0004] The purpose of this invention is to provide a control and data acquisition circuit for a high-voltage electric disconnect switch, which solves the problem of high cost associated with the existing 7-wire system used to achieve remote control output and remote signal acquisition functions between relay protection equipment and remote high-voltage electric disconnect switches.

[0005] To solve the above-mentioned technical problems, the present invention provides a control and acquisition circuit for a high-voltage electric disconnect switch, including a remote signaling acquisition circuit and a remote control circuit; the remote signaling acquisition circuit includes a first remote signaling acquisition branch for transmitting the open position signal of the high-voltage electric disconnect switch to the disconnection position input port of the relay protection device via a second remote signaling cable, and a second remote signaling acquisition branch for transmitting the close position signal of the high-voltage electric disconnect switch to the disconnection position input port of the relay protection device via a first remote signaling cable;

[0006] The remote control circuit includes two sets of control branches. The first set of control branches is used to transmit the signals from the isolation closing positive terminal and the isolation opening negative terminal of the relay protection device to the closing positive terminal and the opening negative terminal of the high-voltage electric disconnector via the first remote control cable. The second set of control branches is used to transmit the signals from the isolation closing negative terminal and the isolation opening positive terminal of the relay protection device to the closing negative terminal and the opening positive terminal of the high-voltage electric disconnector via the second remote control cable. So that when controlling the high-voltage electric disconnector to close or open, there is exactly one branch between the closing positive terminal and the closing negative terminal of the high-voltage electric disconnector and between the opening positive terminal and the opening negative terminal of the high-voltage electric disconnector.

[0007] The beneficial effects are as follows: By configuring the aforementioned remote signaling acquisition circuit and remote control circuit, this invention enables the transmission of the open position signal of the high-voltage electric disconnector to the disconnection / opening input port of the relay protection device via the second remote signaling cable; the transmission of the close position signal of the high-voltage electric disconnector to the disconnection / closed input port of the relay protection device via the first remote signaling cable; and when controlling the high-voltage electric disconnector to close or open, only one branch of the high-voltage electric disconnector—between the positive and negative closing terminals—is connected. The first remote signaling cable and the first remote control cable are the same cable, and the second remote signaling cable and the second remote control cable are the same cable. This means that the relay protection device can perform remote opening or closing operations with only two cables, and it also enables the detection of the open / closed position of the high-voltage electric disconnector. Therefore, compared to the prior art's method of achieving remote control output and remote signaling acquisition functions through a 7-wire system, this invention reduces costs.

[0008] Furthermore, the first set of control branches includes a first diode disposed on the connection line between the first remote control cable and the positive closing terminal of the high-voltage electric disconnect switch, and a third diode disposed on the connection line between the first remote control cable and the negative opening terminal of the high-voltage electric disconnect switch. The negative terminal of the first diode is used to connect to the positive closing terminal of the high-voltage electric disconnect switch, and the positive terminal of the third diode is used to connect to the negative opening terminal of the high-voltage electric disconnect switch. The second set of control branches includes a second diode disposed on the connection line between the second remote control cable and the negative closing terminal of the high-voltage electric disconnect switch, and a fourth diode disposed on the connection line between the second remote control cable and the positive opening terminal of the high-voltage electric disconnect switch. The negative terminal of the fourth diode is used to connect to the positive opening terminal of the high-voltage electric disconnect switch, and the positive terminal of the second diode is used to connect to the negative closing terminal of the high-voltage electric disconnect switch.

[0009] By setting the aforementioned diode in this invention, a path can be formed only from the positive closing terminal to the negative closing terminal in the high-voltage electric disconnector, and a path can be formed only from the positive opening terminal to the negative opening terminal. Moreover, the conduction directions of the two paths are opposite. Therefore, at any given time, only one path is conducting. Thus, the setting of the diode in this invention ensures that when controlling the closing or opening of the high-voltage electric disconnector, only one branch of the branch between the positive closing terminal and the negative closing terminal of the high-voltage electric disconnector and the branch between the positive opening terminal and the negative opening terminal of the high-voltage electric disconnector are conducting.

[0010] Furthermore, the first remote signaling cable and the first remote control cable are the same cable, and the second remote signaling cable and the second remote control cable are the same cable; it also includes a selection circuit, which controls the connection of the remote signaling acquisition circuit so as to control the remote signaling acquisition circuit to disconnect when the high-voltage electric disconnecting switch needs to be opened or closed.

[0011] Furthermore, the first remote signaling acquisition branch includes a first switch module connected in series between the power supply end and the end of the first remote signaling cable not connected to the high-voltage electric disconnect switch, and a third switch module connected in series between the disconnection / opening input end of the relay protection device and the end of the second remote signaling cable not connected to the high-voltage electric disconnect switch. The first output end of the selection circuit controls the connection to the first switch module, and the second output end of the selection circuit controls the connection to the third switch module. The second remote signaling acquisition branch includes a second switch module connected in series between the power supply end and the end of the second remote signaling cable not connected to the high-voltage electric disconnect switch, and a third switch module connected in series between the disconnection / closing input end of the relay protection device and the end of the first remote signaling cable not connected to the high-voltage electric disconnect switch. The fourth switch module is connected to one end of the circuit. The third output terminal of the selection circuit controls the connection to the second switch module, and the fourth output terminal of the selection circuit controls the connection to the fourth switch module. When the high-voltage electric disconnect switch is in the open position, the selection circuit controls the on / off state of the first and third switch modules, as well as the on / off state of the second and fourth switch modules, to achieve the connection of the first remote signal acquisition branch and the disconnection of the second remote signal acquisition branch. When the high-voltage electric disconnect switch is in the closed position, the selection circuit controls the on / off state of the second and fourth switch modules, as well as the on / off state of the first and third switch modules, to achieve the connection of the second remote signal acquisition branch and the disconnection of the first remote signal acquisition branch.

[0012] Furthermore, the signals output by the first output terminal and the second output terminal of the selection circuit are the same, the signals output by the third output terminal and the fourth output terminal of the selection circuit are the same, and the signals output by the first output terminal and the third output terminal of the selection circuit are opposite.

[0013] Because the selection circuit controls the on / off state of the switch modules, and the first and third switch modules are in the same remote signaling branch, and the second and fourth switch modules are in the same remote signaling branch, in order to ensure that the first and third switch modules have the same switching state, the second and fourth switch modules have the same switching state, and the signal branches of different remote signaling branches have different conduction states, this invention achieves the switching state of the above-mentioned switch modules by setting the signal state of the output terminal of the selection circuit, thereby making the signal branches of different remote signaling branches have different conduction states, so as to accurately determine the opening and closing state of the high-voltage electric disconnector.

[0014] Furthermore, the selection circuit includes a pulse signal generator and a NOT gate connected in series, with the first output terminal and the second output terminal connected between the pulse signal generator and the NOT gate, and the third output terminal and the fourth output terminal connected to the output terminal of the NOT gate.

[0015] The output of the signal generator is connected to the NOT gate, so the signal at the output of the signal generator is opposite to the signal at the output of the NOT gate. Therefore, by connecting the first and second outputs to the connection line between the signal generator and the NOT gate, and connecting the third and fourth outputs to the output of the NOT gate, the signals output by the first and second outputs can be the same, the signals output by the third and fourth outputs of the selection circuit can be the same, and the signals output by the first and third outputs of the selection circuit can be opposite.

[0016] Furthermore, the selection circuit includes a blocking pulse signal circuit, which is used to control the signals output by the first output terminal, the second output terminal, the third output terminal, and the fourth output terminal when the high-voltage electric disconnecting switch needs to be opened or closed, so as to disconnect the first switch module, the second switch module, the third switch module, and the fourth switch module, thereby controlling the remote signaling acquisition circuit to disconnect.

[0017] Furthermore, the selection circuit includes a 245 bus transceiver, with a first output terminal, a second output terminal, a third output terminal, and a fourth output terminal being the output terminals of the 245 bus transceiver. The output terminal of the latching pulse signal circuit is connected to the chip select port of the 245 bus transceiver to control the output terminals of the 245 bus transceiver through the latching pulse signal circuit.

[0018] Furthermore, the blocking pulse signal circuit includes a fifth switching module, and a first resistor and a second resistor respectively connected in series at both ends of the fifth switching module. The other end of the first resistor is connected to the closing positive terminal / opening negative terminal and the opening positive terminal / closing negative terminal of the relay protection device connected in parallel with diodes. The other end of the second resistor is connected to the ground terminal. The conducting terminal of the fifth switching module is connected in series between the DC power supply and the chip select port of the 245 bus transceiver, so as to control the on / off state of the fifth switching module through the closing positive terminal / opening negative terminal and the opening positive terminal / closing negative terminal of the relay protection device connected in parallel with diodes.

[0019] Since the on / off state of the fifth switch module can control the signal input to the chip select port of the 245 bus transceiver, the present invention can realize the on / off state of the fifth switch module through the above settings, thereby controlling the signal input to the chip select port of the 245 bus transceiver, and thus controlling the signal output of the output terminal of the 245 bus transceiver.

[0020] Furthermore, the blocking pulse signal circuit also includes a third resistor with one end connected to the positive closing terminal / negative opening terminal and the positive opening terminal / negative closing terminal of the relay protection device connected in parallel with diodes, and the other end connected to the ground terminal; and a fourth resistor with one end connected to the connection line between the first resistor and the fifth switch module, and the other end connected to the connection line between the fifth switch module and the second resistor.

[0021] In this invention, the turn-on threshold voltage of the latching pulse signal circuit is increased by setting a third resistor and a fourth resistor. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the interaction connection between existing relay protection equipment and high-voltage electric switches;

[0023] Figure 2 This is a schematic diagram of the control and data acquisition circuit for the high-voltage electric disconnect switch of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0025] Example of a control and data acquisition circuit for a high-voltage electric disconnector:

[0026] like Figure 2 The circuit diagram for this embodiment is shown below:

[0027] This includes a remote signaling acquisition circuit and a remote control circuit. The remote signaling acquisition circuit includes a first remote signaling acquisition branch and a second remote signaling acquisition branch. The remote control circuit includes two sets of control branches. The first set of control branches includes a first diode D1 installed on the connection line between the first remote control cable L1 and the positive closing terminal of the high-voltage electric disconnector, and a third diode D3 installed on the connection line between the first remote control cable L1 and the negative opening terminal of the high-voltage electric disconnector. The cathode of the first diode is used to connect to the positive closing terminal of the high-voltage electric disconnector, and the anode of the third diode is used to connect to the negative opening terminal of the high-voltage electric disconnector. The second set of control branches includes a second diode D2 installed on the connection line between the second remote control cable L2 and the negative closing terminal of the high-voltage electric disconnector, and a fourth diode D4 installed on the connection line between the second remote control cable and the positive opening terminal of the high-voltage electric disconnector. The cathode of the fourth diode is used to connect to the positive opening terminal of the high-voltage electric disconnector, and the anode of the second diode is used to connect to the negative closing terminal of the high-voltage electric disconnector.

[0028] In this embodiment, the remote control circuit includes two sets of control branches. The first set of control branches is used to transmit the signals from the isolation closing positive terminal and the isolation opening negative terminal of the relay protection device to the closing positive terminal and the opening negative terminal of the high-voltage electric disconnector via the first remote control cable. The second set of control branches is used to transmit the signals from the isolation closing negative terminal and the isolation opening positive terminal of the relay protection device to the closing negative terminal and the opening positive terminal of the high-voltage electric disconnector via the second remote control cable. So that when controlling the high-voltage electric disconnector to close or open, there is only one branch between the closing positive terminal and the closing negative terminal of the high-voltage electric disconnector and between the opening positive terminal and the opening negative terminal of the high-voltage electric disconnector.

[0029] like Figure 2 As shown, in order to further reduce the cost of the circuit in this embodiment, the first remote signaling cable and the first remote control cable are the same cable L1, and the second remote signaling cable and the second remote control cable are the same cable L2. Based on this, in order to avoid the influence of the acquisition circuit during the opening and closing control, this embodiment also includes a selection circuit. The selection circuit controls the connection of the remote signaling acquisition circuit so as to control the remote signaling acquisition circuit to disconnect when the high-voltage electric disconnecting switch needs to be opened and closed.

[0030] Based on the selection circuit set in this embodiment, such as Figure 2 As shown, in this embodiment, the first remote signaling acquisition branch includes a first switch module connected in series between the power supply end and the end of the first remote signaling cable not connected to the high-voltage electric disconnect switch, and a third switch module connected in series between the disconnection input terminal of the relay protection device and the end of the second remote signaling cable not connected to the high-voltage electric disconnect switch. The first output terminal of the selection circuit controls the connection to the first switch module, and the second output terminal of the selection circuit controls the connection to the third switch module. The second remote signaling acquisition branch includes a second switch module connected in series between the power supply end and the end of the second remote signaling cable not connected to the high-voltage electric disconnect switch, and a third switch module connected in series between the disconnection input terminal of the relay protection device and the end of the first remote signaling cable not connected to the high-voltage electric disconnect switch. The fourth switch module is connected to one end of the circuit. The third output terminal of the selection circuit controls the connection to the second switch module, and the fourth output terminal of the selection circuit controls the connection to the fourth switch module. When the high-voltage electric disconnect switch is in the open position, the selection circuit controls the on / off state of the first and third switch modules, as well as the on / off state of the second and fourth switch modules, to achieve the connection of the first remote signal acquisition branch and the disconnection of the second remote signal acquisition branch. When the high-voltage electric disconnect switch is in the closed position, the selection circuit controls the on / off state of the second and fourth switch modules, as well as the on / off state of the first and third switch modules, to achieve the connection of the second remote signal acquisition branch and the disconnection of the first remote signal acquisition branch.

[0031] The control and acquisition circuit of the high-voltage electric disconnect switch based on this embodiment can realize remote signaling and remote control processes. Specifically, the working principle of the circuit in this embodiment is as follows:

[0032] 1) The acquisition process of the disconnected closing remote signal input and the disconnected opening remote signal input acquired by the relay protection equipment is as follows:

[0033] 1.1) When the high-voltage electric disconnector is in the closed position: At this time, the two closing limit switches QF-H inside the high-voltage electric disconnector are open, and the two opening limit switches QF-F are closed.

[0034] When the square wave signal FB_KZ generated by the 555 timer U2 is at a low level:

[0035] The FB_KZ signal is low. After being inverted by NOT gate U3, the FB_KZ signal generates a high-level signal / FB_KZ. The FB_KZ signal enters pins A1 and A2 of the 245 bus transceiver, and after being buffered, exits from pins B1 and B2, generating FB_KZ1 and FB_KZ2 signals. FB_KZ1 and FB_KZ2 signals enter the primary windings of optical MOS relays Q1 and Q3, respectively. Since both FB_KZ1 and FB_KZ2 signals are low, the secondary windings of optical MOS relays Q1 and Q3 are not conducting. Therefore, the circuit DC220V power supply → secondary side of opto-MOS relay Q1 → resistor R1 → diode D1 → closing limit switch QF-H → motor M → closing limit switch QF-H → diode D2 → secondary side of opto-MOS relay Q3 → primary side of opto-MOS relay Q5 → resistor R5 will not conduct, and consequently the secondary side of opto-MOS relay Q5 will not conduct. The DC220V power supply cannot enter the remote signaling acquisition port of the disconnecting switch of the relay protection equipment through the secondary side of opto-MOS relay Q5, and the remote signaling acquisition port of the disconnecting switch acquired by the relay protection equipment will be 0.

[0036] The / FB_KZ signal is high and enters pins A3 and A4 of the 245 bus transceiver. After buffering, it exits from pins B3 and B4, generating / FB_KZ1 and / FB_KZ2 signals. / FB_KZ1 and / FB_KZ2 signals then enter the primary windings of opto-MOS relays Q2 and Q4, respectively, controlling the secondary windings of these relays to conduct. DC220V power flows through the secondary winding of opto-MOS relay Q2 and resistor R2 into the GKFZ+ / GKHZ- conductors. Since the trip limit switch QF-F is closed and diodes D3 and D4 are in the forward position, the circuit is as follows: DC220V power supply → secondary winding of opto-MOS relay Q2 → resistor R2 → diode D4 → trip limit switch QF-F → motor M → trip limit switch QF-F → diode D3 → secondary winding of opto-MOS relay Q4 → primary winding of opto-MOS relay Q6 → resistor R6 conducts, thus turning on the secondary winding of opto-MOS relay Q6. The DC220V power supply enters the remote signaling acquisition port of the isolating switch closed position input of the relay protection device through the secondary side of the opto-MOS relay Q6. The isolating switch closed position remote signaling input acquired by the relay protection device is 1.

[0037] When the square wave signal FB_KZ generated by the 555 timer U2 is at a high level:

[0038] The FB_KZ signal is high. After being inverted by NOT gate U3, the FB_KZ signal generates a low-level signal / FB_KZ. The FB_KZ signal enters pins A1 and A2 of the 245 bus transceiver, and after being buffered, it exits from pins B1 and B2, generating FB_KZ1 and FB_KZ2 signals. FB_KZ1 and FB_KZ2 signals enter the primary windings of optical MOS relays Q1 and Q3, respectively, controlling the secondary windings of optical MOS relays Q1 and Q3 to conduct. The DC220V power supply enters the GKHZ+ / GKFZ- conductor through the secondary side of the opto-MOS relay Q1 and resistor R1. Because the closing limit switch QF-H is open and diodes D3 and D4 are in reverse positions, the circuit DC220V power supply → secondary side of opto-MOS relay Q1 → resistor R1 → diode D1 → closing limit switch QF-H → motor M → closing limit switch QF-H → diode D2 → secondary side of opto-MOS relay Q3 → primary side of opto-MOS relay Q5 → resistor R5 will not conduct. Therefore, the remote signaling acquisition port of the disconnecting switch of the relay protection equipment cannot acquire a high voltage signal, and the remote signaling acquisition port of the disconnecting switch acquired by the relay protection equipment is 0.

[0039] The / FB_KZ signal is low and enters pins A3 and A4 of the 245 bus transceiver. After buffering, it exits from pins B3 and B4, generating / FB_KZ1 and / FB_KZ2 signals. / FB_KZ1 and / FB_KZ2 signals then enter the primary windings of opto-MOS relays Q2 and Q4, respectively. Since both / FB_KZ1 and / FB_KZ2 signals are low, the secondary windings of opto-MOS relays Q2 and Q4 are not conducting. The circuit flow is: DC220V power supply → secondary winding of opto-MOS relay Q2 → resistor R2 → diode D4 → trip limit switch QF-F → motor M → trip limit switch QF-F → diode D3 → secondary winding of opto-MOS relay Q4 → primary winding of opto-MOS relay Q6 → resistor R6. Therefore, the remote signal acquisition port of the disconnector switch closing position input of the relay protection equipment cannot acquire a high voltage signal, and the remote signal acquisition port of the disconnector closing position input acquired by the relay protection equipment is 0.

[0040] Therefore, when the high-voltage electric disconnector is in the closed position, the remote signal input for the disconnection and closing position collected by the relay protection equipment is a square wave signal that alternates between 0 and 1; the remote signal input for the disconnection and separation position is a signal that is always 0.

[0041] 1.2) When the high-voltage electric disconnector is in the open position: At this time, the two closing limit switches QF-H inside the high-voltage electric disconnector are closed, and the two opening limit switches QF-F are open.

[0042] Similar to the analysis in 1.1), when the square wave signal FB_KZ generated by the 555 timer U2 is at a low level: the remote signal input for the isolation position acquired by the relay protection device is 0, and the remote signal input for the isolation position acquired by the relay protection device is 0. When the square wave signal FB_KZ generated by the 555 timer U2 is at a high level: the remote signal input for the isolation position acquired by the relay protection device is 1, and the remote signal input for the isolation position acquired by the relay protection device is 0.

[0043] Therefore, when the high-voltage electric disconnector is in the open position, the remote signal input for the disconnection position collected by the relay protection equipment is a square wave signal that alternates between 0 and 1; the remote signal input for the disconnection position is a signal that is always 0.

[0044] 2) When performing remote control operation of relay protection equipment for opening or closing:

[0045] When the relay protection equipment performs a tripping operation, GKFZ+ / GKHZ- (i.e., the positive terminal for tripping / the negative terminal for closing) is positively energized, and GKHZ+ / GKFZ- (i.e., the positive terminal for closing / the negative terminal for tripping) is negatively energized. The circuit GKFZ+ / GKHZ- → diode D6 → resistor R9 → primary side of optocoupler OP1 → resistor R10 → DC 0V conducts, thus the secondary side of optocoupler OP1 conducts. The chip select port / OE level of the 245 bus transceiver chip U1 is pulled high to 5V, B1, When pins B2, B3, and B4 output a high-impedance state, the levels of FB_KZ1, FB_KZ2, / FB_KZ1, and / FB_KZ2 are pulled low by resistors R3, R7, R2, and R8 connected in parallel on the primary side of opto-MOS relays Q1, Q3, Q2, and Q4, respectively. At this time, opto-MOS relays Q1, Q3, Q2, and Q4 are not conducting, and the square wave voltage used to detect the input signal cannot be injected into the GKFZ+ / GKHZ- and GKHZ+ / GKFZ- wires, ensuring the reliability of the tripping operation.

[0046] Similarly, when the relay protection device performs a closing operation, GKFZ+ / GKHZ- is negatively energized and GKHZ+ / GKFZ- is positively energized. The circuit GKHZ+ / GKFZ- → diode D5 → resistor R9 → primary side of optocoupler OP1 → resistor R10 → DC 0V conducts, thus the secondary side of optocoupler OP1 conducts. The chip select port / OE level of the 245 bus transceiver chip U1 is pulled high to 5V, and pins B1, B2, B3, and B4 output a high-impedance state. The voltage levels of FB_KZ1, FB_KZ2, / FB_KZ1, and / FB_KZ2 are pulled low by resistors R3, R7, R2, and R8 connected in parallel on the primary side of opto-MOS relays Q1, Q3, Q2, and Q4, respectively. At this time, opto-MOS relays Q1, Q3, Q2, and Q4 are not conducting, and the square wave voltage used to detect the input signal cannot be injected into the GKFZ+ / GKHZ- and GKHZ+ / GKFZ- wires, thus ensuring the reliability of the tripping operation.

[0047] Therefore, in this embodiment, diodes D5 and D6, resistors R9, R10, R11, R12, optocoupler OP1, and resistor R13 constitute a square wave blocking circuit. When the relay protection device performs a tripping / closing operation, this square wave blocking circuit pulls the chip select port ( / OE) of the 245 bus transceiver chip U1 high, causing the output port of the U1 chip to return to a high-impedance state, forcing the opto-MOS relays Q1, Q3, Q2, and Q4 to not conduct, thus ensuring the reliability of tripping / closing. Resistors R11 and R12 are used to increase the conduction threshold voltage of the square wave blocking circuit. When the relay protection device does not perform a tripping / closing operation, square wave signals for detecting the tripping / closing position of the isolating switch are present on the GKFZ+ / GKHZ- and GKHZ+ / GKFZ- wires. At this time, resistors R1 / R2, R9, R10, R11, R12 and the primary side of optocoupler OP1 form a voltage divider circuit. The voltage divided by the square wave blocking circuit is less than the conduction threshold voltage of the square wave blocking circuit, so the square wave blocking circuit does not operate. When the relay protection equipment performs a tripping / closing operation, there is DC220V on the GKFZ+ / GKHZ- and GKHZ+ / GKFZ- conductors that controls the operation of the high-voltage disconnect switch. Since there is no voltage division effect from resistors R1 / R2 at this time, the voltage on the square wave blocking circuit is DC220V. At this point, the square wave blocking circuit activates, pulling high the chip select port / OE of the 245 bus transceiver chip U1, thus preventing the opto-MOS relays Q1, Q3, Q2, and Q4 from conducting. The square wave voltage used to detect the input signal cannot be injected into the GKFZ+ / GKHZ- and GKHZ+ / GKFZ- conductors, ensuring the reliability of the tripping / closing operation. As another implementation method, [the following can be added] Figure 2The optical MOS relays Q1, Q3, Q2, Q4, Q5, and Q6 in this embodiment can be replaced with optocouplers or electromagnetic relays, or optocoupler OP1 can be replaced with an optical MOS relay or electromagnetic relay, or the 245 bus transceiver can be replaced with an analog switch, which can also realize the remote signaling and remote control process described above in this embodiment.

[0048] The invention is characterized by using a 555 square wave generator to produce square waves with a duty cycle of approximately 50%, controlling six opto-MOS relays to indirectly control the DC 220V power supply, forming alternating square waves injected into cables L1 and L2. These square waves pass through the opening / closing limit switches of the high-voltage electric disconnector, and then enter the disconnection / opening position input contacts of the relay protection device, thereby acquiring the disconnection / opening position remote signal. When the relay protection device issues a closing / opening remote control output command, the remote signal square wave is blocked by a square wave blocking circuit to prevent interference with the remote control operation.

[0049] In this invention, through the aforementioned remote signaling acquisition circuit and remote control circuit, the open position signal of the high-voltage electric disconnector can be transmitted to the disconnection / opening input port of the relay protection device via the second remote signaling cable, and the closed position signal of the high-voltage electric disconnector can be transmitted to the disconnection / closing input port of the relay protection device via the first remote signaling cable. Furthermore, when controlling the high-voltage electric disconnector to close or open, only one branch of the branch between the positive and negative closing terminals of the high-voltage electric disconnector and the branch between the positive and negative opening terminals of the high-voltage electric disconnector are connected. This means that the relay protection device can perform remote opening or closing operations with only two cables, and the open / closed position of the high-voltage electric disconnector can be detected. Therefore, compared to the prior art's method of achieving remote control output and remote signaling acquisition functions through a 7-wire system, this invention reduces costs.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A control and data acquisition circuit for a high-voltage electric disconnector, characterized in that, It includes a remote signaling acquisition circuit and a remote control circuit; the remote signaling acquisition circuit includes a first remote signaling acquisition branch and a second remote signaling acquisition branch; In the first remote signaling acquisition branch, the end of the first remote signaling cable that is not connected to the high-voltage electric disconnect switch is connected to the power supply through the first switch module; A third switch module is grounded between the disconnection input terminal of the relay protection device and the end of the remote signaling second cable that is not connected to the high-voltage electric disconnect switch, so as to transmit the open position signal of the high-voltage electric disconnect switch to the disconnection input port of the relay protection device via the remote signaling second cable. In the second remote signaling acquisition branch, the end of the second remote signaling cable that is not connected to the high-voltage electric disconnect switch is connected to the power supply through the second switch module; A fourth switch module is grounded between the disconnection / close position input terminal of the relay protection device and the end of the remote signaling first cable that is not connected to the high-voltage electric disconnector, so as to transmit the closing position signal of the high-voltage electric disconnector to the disconnection / close position input port of the collector protection device via the remote signaling first cable. The remote control circuit includes two sets of control branches. The first set of control branches is used to transmit the signals of the isolation closing positive terminal and the isolation opening negative terminal of the relay protection device to the closing positive terminal and the opening negative terminal of the high-voltage electric disconnector via the first remote control cable. The second set of control branches is used to transmit the signals of the isolation closing negative terminal and the isolation opening positive terminal of the relay protection device to the closing negative terminal and the opening positive terminal of the high-voltage electric disconnector via the second remote control cable. So that when controlling the high-voltage electric disconnector to close or open, there is only one branch between the closing positive terminal and the closing negative terminal of the high-voltage electric disconnector and between the opening positive terminal and the opening negative terminal of the high-voltage electric disconnector. The first remote signaling cable and the first remote control cable are the same cable; the second remote signaling cable and the second remote control cable are the same cable.

2. The control and acquisition circuit for the high-voltage electric disconnector according to claim 1, characterized in that, The first set of control branches includes a first diode disposed on the connection line between the first remote control cable and the positive closing terminal of the high-voltage electric disconnect switch, and a third diode disposed on the connection line between the first remote control cable and the negative opening terminal of the high-voltage electric disconnect switch. The negative terminal of the first diode is used to connect to the positive closing terminal of the high-voltage electric disconnect switch, and the positive terminal of the third diode is used to connect to the negative opening terminal of the high-voltage electric disconnect switch. The second set of control branches includes a second diode disposed on the connection line between the second remote control cable and the negative closing terminal of the high-voltage electric disconnect switch, and a fourth diode disposed on the connection line between the second remote control cable and the positive opening terminal of the high-voltage electric disconnect switch. The negative terminal of the fourth diode is used to connect to the positive opening terminal of the high-voltage electric disconnect switch, and the positive terminal of the second diode is used to connect to the negative closing terminal of the high-voltage electric disconnect switch.

3. The control and acquisition circuit for the high-voltage electric disconnector according to claim 2, characterized in that, It also includes a selection circuit, which controls the connection to the remote signaling acquisition circuit so that the remote signaling acquisition circuit can be disconnected when the opening and closing control of the high-voltage electric disconnecting switch is required.

4. The control and acquisition circuit for the high-voltage electric disconnector according to claim 3, characterized in that, The first output terminal of the selection circuit controls the connection to the first switch module, and the second output terminal of the selection circuit controls the connection to the third switch module; the third output terminal of the selection circuit controls the connection to the second switch module, and the fourth output terminal of the selection circuit controls the connection to the fourth switch module; so that when the high-voltage electric disconnect switch is in the open position, the selection circuit controls the on / off state of the first and third switch modules, as well as the on / off state of the second and fourth switch modules, to achieve the connection of the first remote signal acquisition branch and the disconnection of the second remote signal acquisition branch; when the high-voltage electric disconnect switch is in the closed position, the selection circuit controls the on / off state of the second and fourth switch modules, as well as the on / off state of the first and third switch modules, to achieve the connection of the second remote signal acquisition branch and the disconnection of the first remote signal acquisition branch.

5. The control and acquisition circuit for the high-voltage electric disconnector according to claim 4, characterized in that, The signals output by the first and second output terminals of the selection circuit are the same, the signals output by the third and fourth output terminals of the selection circuit are the same, and the signals output by the first and third output terminals of the selection circuit are opposite.

6. The control and acquisition circuit for the high-voltage electric disconnector according to claim 5, characterized in that, The selection circuit includes a pulse signal generator and a NOT gate connected in series. The first output terminal and the second output terminal are connected between the pulse signal generator and the NOT gate, and the third output terminal and the fourth output terminal are connected to the output terminal of the NOT gate.

7. The control and acquisition circuit for the high-voltage electric disconnector according to claim 6, characterized in that, The selection circuit includes a blocking pulse signal circuit, which is used to control the signals output by the first output terminal, the second output terminal, the third output terminal and the fourth output terminal when the high-voltage electric disconnecting switch needs to be opened and closed, so as to disconnect the first switch module, the second switch module, the third switch module and the fourth switch module, and control the remote signaling acquisition circuit to disconnect.

8. The control and acquisition circuit for the high-voltage electric disconnector according to claim 7, characterized in that, The selection circuit includes a 245 bus transceiver. The first output terminal, the second output terminal, the third output terminal, and the fourth output terminal are the output terminals of the 245 bus transceiver. The output terminal of the latching pulse signal circuit is connected to the chip select port of the 245 bus transceiver so as to control the output terminal of the 245 bus transceiver through the latching pulse signal circuit.

9. The control and acquisition circuit for the high-voltage electric disconnector according to claim 8, characterized in that, The blocking pulse signal circuit includes a fifth switch module, and a first resistor and a second resistor respectively connected in series at both ends of the fifth switch module. The other end of the first resistor is connected to the closing positive terminal / opening negative terminal and the opening positive terminal / closing negative terminal of the relay protection device connected in parallel with diodes. The other end of the second resistor is connected to the ground terminal. The conducting terminal of the fifth switch module is connected in series between the DC power supply and the chip select port of the 245 bus transceiver, so as to control the on and off of the fifth switch module through the closing positive terminal / opening negative terminal and the opening positive terminal / closing negative terminal of the relay protection device connected in parallel with diodes.

10. The control and acquisition circuit for the high-voltage electric disconnector according to claim 9, characterized in that, The blocking pulse signal circuit also includes a third resistor with one end connected to the positive closing terminal / negative opening terminal and the positive opening terminal / negative closing terminal of the relay protection device connected in parallel with diodes, and the other end connected to the ground terminal; and a fourth resistor with one end connected to the connection line between the first resistor and the fifth switch module, and the other end connected to the connection line between the fifth switch module and the second resistor.

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