CN220710157U - Isolating switch control circuit - Google Patents
Isolating switch control circuit Download PDFInfo
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- CN220710157U CN220710157U CN202321879704.1U CN202321879704U CN220710157U CN 220710157 U CN220710157 U CN 220710157U CN 202321879704 U CN202321879704 U CN 202321879704U CN 220710157 U CN220710157 U CN 220710157U
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- power supply
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- 229910018503 SF6 Inorganic materials 0.000 claims abstract description 6
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 229960000909 sulfur hexafluoride Drugs 0.000 claims abstract description 4
- 238000011065 in-situ storage Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 7
- 230000000903 blocking effect Effects 0.000 description 6
- 238000009413 insulation Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Abstract
The utility model discloses an isolating switch control circuit which comprises a low-pressure locking unit, an electric five-prevention locking unit, an operating power locking unit and an unlocking unit, wherein the low-pressure locking unit is connected with the electric five-prevention locking unit; the low-pressure locking unit comprises SF 6 A pressure sensor GP1 and a low-pressure latching relay K16; the SF 6 The pressure sensor GP1 is arranged in the breaker air chamber and used for monitoring SF in the breaker air chamber 6 Pressure; SF (sulfur hexafluoride) 6 The normally open auxiliary contact of the pressure sensor GP1 is connected in series to the coil loop of the low-pressure latching relay K16 and is connected with a control power supply unit; normally open auxiliary contact of low-pressure latching relay K16The series connection is in the closing loop of the isolating switch. Is used for solving the problem of SF generation in a QF air chamber of a 220kV breaker in the background art 6 The utility model ensures SF in a QF air chamber of a 220kV circuit breaker under the condition of low air pressure 6 And under the condition of too low gas pressure, the high-voltage isolating switch is closed and locked, so that the normal operation of the electric primary equipment and the electric power system is ensured.
Description
Technical Field
The utility model belongs to the technical field of power systems, and particularly relates to an isolating switch control circuit.
Background
At present, a control circuit of a high-voltage isolating switch of a power system with the voltage class of 220kV and above is single, the influence of a low-voltage locking function on the control circuit is not fully considered, and misoperation events can be caused to operators, so that three-phase short-circuit faults are caused. SF in QF air chamber, especially when adjacent 220kV circuit breakers 6 Too low gas pressure, SF 6 If the gas insulation is insufficient and the high-voltage isolating switch is switched on, the 220kV high-voltage electric instant breakdown breaker QF air chamber SF 6 The gas causes 220kV three-phase grounding short circuit fault, and the strong fault current can bring great damage to the stability of a power system and electric primary equipment, and even endanger personal safety.
In summary, SF occurs in the QF air chamber of the 220kV breaker in the prior art 6 The problem of short circuit failure is easily caused under the condition of too low gas pressure.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides an isolating switch control circuit which is used for solving the problem of QF gas of a 220kV circuit breaker in the background artIndoor SF generation 6 The utility model ensures SF in a QF air chamber of a 220kV circuit breaker under the condition of low air pressure 6 And under the condition of too low gas pressure, the high-voltage isolating switch is closed and locked, so that the normal operation of the electric primary equipment and the electric power system is ensured.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
an isolating switch control circuit comprises a low-pressure locking unit;
the low-pressure locking unit comprises SF 6 A pressure sensor GP1 and a low-pressure latching relay K16;
the SF 6 The pressure sensor GP1 is arranged in the breaker air chamber and used for monitoring SF in the breaker air chamber 6 Pressure; SF (sulfur hexafluoride) 6 The normally open auxiliary contact of the pressure sensor GP1 is connected in series to the coil loop of the low-pressure latching relay K16 and is connected with a control power supply unit;
and a normally open auxiliary contact of the low-pressure latching relay K16 is connected in series in a closing loop of the isolating switch.
Preferably, the power supply control device further comprises an operation power supply locking unit, wherein the operation power supply locking unit comprises an operation power supply locking relay KB;
the coils of the operation power supply locking relay KB are connected in series with two ends of the operation power supply locking power supply LN, and normally open auxiliary contacts of the operation power supply locking relay KB are connected in series in the isolating switch closing loop.
Further, the model KB of the operation power latching relay is LADN40.
Preferably, the device further comprises an unlocking unit, wherein the unlocking unit comprises an interlocking input or unlocking knob switch SK2 and an unlocking relay K15;
the normally open auxiliary contact of the interlocking input or unlocking knob switch SK2 is connected in series to a coil loop of the unlocking relay K15 and is connected with two ends of the unlocking power supply;
the normally open auxiliary contact of the Jie Liansuo relay K15 is connected with a five-prevention locking normally open contact in parallel.
Further, the model of the interlocking input or unlocking knob switch SK2 is LW21-16, and the model of the unlocking relay K15 is LADN40C.
Preferably, the SF 6 The model of the pressure sensor GP1 is WIKAA-10/0-10MPa.
Preferably, the remote control switch also comprises a local switching-on/off control knob switch SK1, a local remote selection relay K1 and auxiliary contacts thereof;
the normally open auxiliary contact of the on-site switching-on/off control knob switch SK1 is connected in series in a coil loop of the on-site remote selection relay K1 and is connected with a control power supply unit;
two pairs of normally open auxiliary contacts and two pairs of normally closed auxiliary contacts of the local remote selection relay K1 are respectively and correspondingly connected in a closing and opening loop of the isolating switch.
Further, the type of the on-site remote selection relay K1 is CAD-32FDC.
Compared with the prior art, the utility model has the following beneficial technical effects:
the utility model provides an isolating switch control circuit, which can ensure SF in a QF air chamber of a circuit breaker by adopting a control circuit of a low-pressure locking unit 6 When the gas pressure is too low, the 220kV isolating switch QSF can be closed, and SF in a QF air chamber of a 220kV circuit breaker is avoided 6 The gas insulation is reduced to cause three-phase grounding short circuit fault, so that the operation stability of primary equipment is improved, and the safe and stable operation of a 220kV power system is ensured.
Drawings
Fig. 1 is a schematic diagram of a 220kV primary system of an isolating switch control circuit according to the present utility model.
Fig. 2 is a schematic diagram of a release unit and a low-pressure locking unit of the isolating switch control circuit of the utility model.
Fig. 3 is a schematic diagram of an operation power supply locking unit of the isolation switch control circuit according to the present utility model.
Fig. 4 is a schematic diagram of the opening and closing of the isolating switch control circuit.
Fig. 5 is a schematic diagram of an operation loop of an isolation switch control circuit according to the present utility model.
Detailed Description
The utility model will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the utility model.
Examples
As shown in fig. 1 to 5, the novel 220kV isolating switch control circuit of the present utility model includes a low-voltage locking unit, an electric five-prevention locking unit, an operation power locking unit, and an unlocking unit.
The included DC110V control power supply unit L + L － The remote switching-on/switching-off control switch comprises a switching-on contactor KE and an auxiliary contact thereof, a switching-off contactor KA and an auxiliary contact thereof, a local remote selection relay K1 and an auxiliary contact thereof, and local switching-on/switching-off control knob switches SM1 and NCS remote switching-on/switching-off command contacts.
The direct current 110V control power supply unit L + L － From a 110V DC bus, positive electrode L + Equal to +57V, negative electrode L － Is equal to-57V.
The coil control power supply of the switching-on contactor KE is DC110V and is taken from a direct current 110V control power supply unit L + L － The three-way valve is provided with two pairs of normally open auxiliary contacts and two pairs of normally closed auxiliary contacts, and the model number of the three-way valve is 3TH4244-1X.
The KA coil control power supply of the opening contactor is DC110V and is taken from a DC110V control power supply unit L + L － . Is taken from the three-way valve and has two pairs of normally open auxiliary contacts and two pairs of normally closed auxiliary contacts, and the model is 3TH4244-1X.
The coil control power supply of the local remote selection relay K1 is DC110V and is taken from a direct current 110V control power supply unit L + L － . The device is provided with two pairs of normally open auxiliary contacts and two pairs of normally closed auxiliary contacts, and the model of the device is CAD-32FDC.
The on-site switching-on and switching-off control knob switch SM1 is provided with two pairs of normally open auxiliary contacts, and the model of the auxiliary contacts is LW21-16.
The low-pressure locking unit comprises a direct-current 110V control power supply unit L + L － QF air chamber SF of 220kV circuit breaker 6 The pressure sensor GP1 and its normally open auxiliary contact, low pressure latching relay K16.SF (sulfur hexafluoride) 6 The model of the pressure monitor GP1 is WIKAA-10/0-10MPa.
The operation power supply blocking unit includes an ac220V operation power supply unit LN and an operation power supply blocking relay KB. The operation power latching relay KB is of the type LADN40.
The unlocking unit comprises a direct-current 110V control power supply unit L + L － An interlocking input or an interlocking release knob switch SK2 and an interlocking release relay K15. The model of the interlocking input or unlocking knob switch SK2 is LW21-16, and the model of the unlocking relay K15 is LADN40C.
The utility model can ensure SF in the QF air chamber of the breaker by adopting the control circuit of the low-pressure locking unit 6 When the gas pressure is too low, the 220kV isolating switch QSF can be closed, and SF in a QF air chamber of a 220kV circuit breaker is avoided 6 The gas insulation is reduced to cause three-phase grounding short circuit fault, so that the operation stability of primary equipment is improved, and the safe and stable operation of a 220kV power system is ensured.
As shown in FIG. 1, the utility model provides a 220kV primary system schematic diagram of a brand new 220kV isolating switch control circuit. A220 kV primary system of a certain 350MW thermal power plant comprises electric primary equipment such as a 220kV I bus, a 220kV II bus, an I bus isolating switch QSF1, an II bus isolating switch QSF2, a circuit breaker QF, a bus grounding disconnecting link QE1, a line grounding disconnecting link QE2 and the like, and the equipment forms GIS equipment. Specifically, the GIS equipment adopts a single-phase packaging structure, most equipment modules are clearly arranged on a horizontal plane, all modules are connected through flanges, and the air tightness of the equipment is ensured by virtue of the principle of an O-shaped sealing ring; dividing each module device into independent air chambers by using basin-type insulators, filling SF6 insulating gas with certain pressure into each air chamber, and equipping SF with each air chamber 6 Pressure monitor GP1 for monitoring SF in each air chamber 6 Pressure. Referring to fig. 1, a 220kV primary system of a certain 350MW thermal power plant may be divided into 5 independent air chambers.
As shown in FIG. 2, the utility model provides a schematic diagram of a low-pressure locking unit of a brand new 220kV isolating switch control circuit. Which comprises a DC110V control power supply unit L + L － QF air chamber SF of 220kV circuit breaker 6 The pressure monitor GP1 and its normally open auxiliary contact and low pressure latching relay K16.
Specifically, the low-pressure locking process of the isolating switch is as follows: the low-pressure locking power supply is taken from a direct-current 110V control power supply unit L + L － Taking SF in QF air chamber of 220kV circuit breaker 6 A pair of normally open auxiliary contacts (13, 14) of the pressure monitor GP1 are connected in series in the coil loop of the low-pressure latching relay K16.SF in QF air chamber of 220kV breaker 6 When the pressure monitor GP1 detects that the pressure of SF6 insulating gas is too low, SF 6 Normally open auxiliary contacts (13, 14) of the pressure monitor GP1 are closed, at the moment, coils (A1, A2) of the low-pressure locking relay K16 are electrified, normally open auxiliary contacts (13, 14) of the low-pressure locking relay K16 in the disconnecting switch opening and closing schematic diagram are opened, and a disconnecting switch closing loop is closed. Otherwise, SF in QF air chamber of 220kV circuit breaker 6 When the pressure meets the requirement, the normally open auxiliary contacts (13 and 14) of the low-pressure latching relay K16 in the switching-on and switching-off schematic diagram of the isolating switch are closed, so that the isolating switch can normally switch on.
As shown in fig. 2, the utility model provides a schematic diagram of a de-interlocking unit of a brand new 220kV isolating switch control circuit. Comprises a DC110V control power supply unit L + L － An interlocking input or an interlocking release knob switch SK2 and an interlocking release relay K15.
Specifically, the disconnecting switch is in the following process: the unlocking power supply is also taken from a direct-current 110V control power supply unit L + L － A pair of normally open auxiliary contacts (3, 4) of an interlock input or interlock release knob switch SK2 are connected in series into the interlock release relay K15 coil loop. When the interlocking input or the unlocking knob switch SK2 is switched to the unlocking position, normally open auxiliary contacts (3 and 4) of the SK2 are closed, coils (A1 and A2) of the unlocking relay K15 are electrified, and normally open auxiliary contacts (13 and 14) of the unlocking relay K15 in the disconnecting switch opening and closing schematic diagram are closed. At this time, the isolating switch can be switched on and off without five-prevention locking. Conversely, when the interlocking knob switch SK2 is put into or released from interlocking, the Jie Liansuo relay K15 is powered off and the isolating switchThe normally open auxiliary contacts (13, 14) of the unlocking relay K15 in the switching-on and switching-off schematic diagram are disconnected, and the isolating switch can switch on and off only when the five-prevention locking condition is met.
Referring to fig. 3, a schematic diagram of an operating power supply blocking unit described by a completely new 220kV isolating switch control circuit is provided. Including an ac220V operating power supply unit LN and an operating power supply latching relay KB.
Specifically, the blocking process of the isolating switch operation power supply is as follows: the operation power supply blocking power supply is taken from an alternating current 220V operation power supply unit LN, and the coils of the operation power supply blocking relay KB are connected in series at two ends of the alternating current 220V operation power supply unit LN. When the isolating switch alternating current 220V operation power supply unit LN is empty to be sent, the coils (A1 and A2) of the operation power supply latching relay KB are electrified, normally open auxiliary contacts (13 and 14) of the operation power supply latching relay KB in an isolating switch opening and closing schematic diagram are closed, and the isolating switch can normally open and close. On the contrary, when the isolating switch alternating current 220V operation power supply unit LN is opened and disconnected, normally open auxiliary contacts (13 and 14) of the operation power supply latching relay KB in the isolating switch opening and closing schematic diagram are disconnected, and then the isolating switch opening and closing loop is latched.
As shown in fig. 4 and fig. 5, the embodiment of the utility model provides a schematic diagram of the opening and closing of the isolating switch, which is a brand new 220kV isolating switch control circuit. Which comprises a DC110V control power supply unit L + L － The remote switching-on/switching-off control switch comprises a switching-on contactor KE and an auxiliary contact thereof, a switching-off contactor KA and an auxiliary contact thereof, a local remote selection relay K1 and an auxiliary contact thereof, and local switching-on/switching-off control knob switches SK1 and NCS remote switching-on/switching-off command auxiliary contacts.
The normally open auxiliary contact of the on-site switching-on/off control knob switch SK1 is connected in series with the coil loop of the on-site remote selection relay K1 and is connected with the control power supply unit;
the remote closing power supply is taken from a direct-current 110V control power supply unit L + L － Normally open auxiliary contacts (M2, N2) of remote closing instruction are connected in series with normally closed auxiliary contacts (21, 22) of local remote selection relay K1, auxiliary contacts (51, 52) of opening relay KA, KE coils (A1, A2) of closing relay and normal of low-pressure locking relay K16Auxiliary contacts (13, 14) are opened.
A pair of normally open auxiliary contacts (43, 44) of the closing contactor KE are connected in parallel with a remote closing instruction normally open auxiliary contact (M2, N2) and a local remote selection relay K1 normally closed auxiliary contact (21, 22).
The on-site switching-on/off power supply is taken from a direct-current 110V control power supply unit L + L － The on-site switching-on/off control knob switch SM1 is correspondingly connected with normally open auxiliary contacts (13, 14) and normally open auxiliary contacts (43, 44) respectively.
The normally open auxiliary contacts (13, 14) are connected to a pair of normally open auxiliary contacts (43, 44) of the closing contactor KE.
The remote switching-off power supply is taken from a direct-current 110V control power supply unit L + L － The normally open auxiliary contacts (M3, N3) of the remote closing instruction are connected in series, and the normally closed auxiliary contacts (31, 32) of the relay K1, the normally closed auxiliary contacts (51, 52) of the closing relay KE and the normally closed auxiliary contacts (A1, A2) of the opening relay KA are remotely selected in situ.
Normally open auxiliary contacts (43, 44) of the opening contactor KA are connected in parallel with normally open auxiliary contacts (M3, N3) of remote closing instructions in series to locally and remotely select normally closed auxiliary contacts (31, 32) of a relay K1.
The normally open auxiliary contacts (43, 44) are connected to normally open auxiliary contacts (43, 44) of the opening contactor KA.
Normally open auxiliary contacts (13, 14) of the low-pressure locking relay K16 and normally closed auxiliary contacts (A1, A2) of the opening relay KA are connected with normally open auxiliary contacts (13, 14) of the operation power locking relay KB; the normally open auxiliary contacts (13, 14) of the operation power latching relay KB are connected in series to release the normally open auxiliary contacts (13, 14) of the interlocking relay K15. The five-prevention locking normally open contacts (M1 and N1) are connected in parallel with Jie Liansuo relay K15 normally open auxiliary contacts (13 and 14).
Specifically, the remote closing operation process of the isolating switch is as follows: the remote closing power supply is taken from a direct-current 110V control power supply unit L + L － When the local remote transfer switch SK1 is switched to a remote position, normally open auxiliary contacts (21 and 22) of the SK1 are disconnected; the remote selection relay K1 coils (A1, A2) are powered off in situ, and the normally closed auxiliary contacts (21, 22) are closed. At the moment, the isolating switch is in a split gate shapeIn the open state, the auxiliary contacts (51, 52) of the brake-separating relay KA are connected. When the low-pressure locking unit and the five-prevention locking unit simultaneously meet the requirements, the normally open auxiliary contacts (13 and 14) and the five-prevention locking normally open contacts (M1 and N1) of the low-pressure locking relay K16 are also in a closed state. Or the low-pressure locking unit and the unlocking unit simultaneously meet the requirements, and the normally open auxiliary contacts (13 and 14) of the low-pressure locking relay K16 and the normally open contacts (13 and 14) of the unlocking relay K15 are also in a closed state. At this time, if the remote closing logic condition is met, the remote closing command normally open auxiliary contacts (M2, N2) are closed, at this time, the coils (A1, A2) of the closing relay KE are electrified, normally open auxiliary contacts (23, 24), (33, 34) of the closing relay KE in the operation circuit in FIG. 5 are turned on, normally closed auxiliary contacts (71, 72) of the closing relay KE are opened, the coils (D1, D2) of the motor M obtain AC220V voltage, the motor M rotates positively, and the isolating switch realizes remote closing.
Specifically, the remote brake separating operation process of the isolating switch is as follows: the remote closing power supply is taken from a direct-current 110V control power supply unit L + L － When the local remote transfer switch SK1 is switched to a remote position, normally open auxiliary contacts (21 and 22) of the SK1 are disconnected; the remote selection relay K1 coils (A1, A2) are powered off in situ, and the normally closed auxiliary contacts (21, 22) are closed. At this time, the isolating switch is in a closing state, and the auxiliary contacts (51, 52) of the closing relay KE are in a closing state. When the low-pressure locking unit and the five-prevention locking unit simultaneously meet the requirements, the normally open auxiliary contacts (13 and 14) and the five-prevention locking normally open contacts (M1 and N1) of the low-pressure locking relay K16 are also in a closed state. Or the low-pressure locking unit and the unlocking unit simultaneously meet the requirements, and the normally open auxiliary contacts (13 and 14) of the low-pressure locking relay K16 and the normally open contacts (13 and 14) of the unlocking relay K15 are also in a closed state. At this time, if the remote opening logic condition is satisfied, the remote closing command normally open auxiliary contacts (M3, N3) are closed, at this time, the opening relay KA coils (A1, A2) are powered on, normally open auxiliary contacts (23, 24), (33, 34) of the opening relay KA in the operating circuit in FIG. 5 are turned on, normally closed auxiliary contacts (71, 72) of the opening relay KA are opened, the motor M coils (D2, D1) obtain AC220V voltage, the motor M is turned on,the isolating switch realizes remote opening.
Specifically, the on-site closing operation process of the isolating switch is as follows: the in-situ closing power supply is also taken from a direct-current 110V control power supply unit L + L － When the local remote transfer switch SK1 is switched to the local position, the SK1 normally-open auxiliary contacts (21 and 22) are disconnected; the remote selection relay K1 coils (A1, A2) are electrified in situ, and the normally open auxiliary contacts (13, 14) are closed. At this time, the disconnecting switch is in a disconnecting state, and auxiliary contacts (51, 52) of the disconnecting relay KA are in a closed state. When the low-pressure locking unit and the five-prevention locking unit simultaneously meet the requirements, the normally open auxiliary contacts (13 and 14) and the five-prevention locking normally open contacts (M1 and N1) of the low-pressure locking relay K16 are also in a closed state. Or the low-pressure locking unit and the unlocking unit simultaneously meet the requirements, and the normally open auxiliary contacts (13 and 14) of the low-pressure locking relay K16 and the normally open contacts (13 and 14) of the unlocking relay K15 are also in a closed state. At this time, if the remote closing logic condition is met, the remote closing command normally open auxiliary contacts (M2, N2) are closed, at this time, the coils (A1, A2) of the closing relay KE are electrified, normally open auxiliary contacts (23, 24), (33, 34) of the closing relay KE in the operation circuit in FIG. 5 are turned on, normally closed auxiliary contacts (71, 72) of the closing relay KE are opened, the coils (D1, D2) of the motor M obtain AC220V voltage, the motor M rotates positively, and the isolating switch realizes on-site closing.
Specifically, the remote brake separating operation process of the isolating switch is as follows: the remote closing power supply is taken from a direct-current 110V control power supply unit L + L － When the local remote transfer switch SK1 is switched to a remote position, normally open auxiliary contacts (21 and 22) of the SK1 are disconnected; the remote selection relay K1 coils (A1, A2) are powered off in situ, and the normally closed auxiliary contacts (21, 22) are closed. At this time, the isolating switch is in a closing state, and the auxiliary contacts (51, 52) of the closing relay KE are in a closing state. When the low-pressure locking unit and the five-prevention locking unit simultaneously meet the requirements, the normally open auxiliary contacts (13 and 14) and the five-prevention locking normally open contacts (M1 and N1) of the low-pressure locking relay K16 are also in a closed state. Or the low-pressure locking unit and the unlocking unit simultaneously meet the requirements, and the normally open auxiliary contact (13. 14) and the unlocking relay K15 are also in a closed state. At this time, if the remote opening logic condition is met, the remote closing command normally open auxiliary contacts (M3, N3) are closed, at this time, the opening relay KA coils (A1, A2) are powered on, normally open auxiliary contacts (23, 24), (33, 34) of the opening relay KA in the operating circuit in FIG. 5 are turned on, normally closed auxiliary contacts (71, 72) of the opening relay KA are opened, the motor M coils (D2, D1) obtain AC220V voltage, the motor M is turned back, and the isolating switch realizes on-site opening.
The utility model relates to a brand new 220kV isolating switch control circuit which comprises a low-pressure locking unit, an operating power locking unit and an unlocking unit, wherein the low-pressure locking unit is connected with the operating power locking unit; DC110V control power supply unit L + L － The utility model adopts a low-pressure locking unit to ensure SF in a breaker QF air chamber 6 Under the condition of too low gas pressure, the 220kV isolating switch QSF is closed and locked, so that SF in a QF gas chamber of the 220kV circuit breaker is avoided 6 The gas insulation is reduced to cause three-phase grounding short circuit fault, so that the operation stability of primary equipment is improved, and the safe and stable operation of a 220kV power system is ensured.
Claims (7)
1. An isolating switch control circuit is characterized by comprising a low-pressure locking unit and an operating power locking unit;
the low-pressure locking unit comprises SF 6 A pressure sensor GP1 and a low-pressure latching relay K16;
the SF 6 The pressure sensor GP1 is arranged in the breaker air chamber and used for monitoring SF in the breaker air chamber 6 Pressure; SF (sulfur hexafluoride) 6 The normally open auxiliary contact of the pressure sensor GP1 is connected in series to the coil loop of the low-pressure latching relay K16 and is connected with a control power supply unit;
the normally open auxiliary contact of the low-pressure latching relay K16 is connected in series in the closing loop of the isolating switch;
the operation power supply locking unit comprises an operation power supply locking relay KB;
the coils of the operation power supply locking relay KB are connected in series with two ends of the operation power supply locking power supply LN, and normally open auxiliary contacts of the operation power supply locking relay KB are connected in series in the isolating switch closing loop.
2. An isolating switch control circuit as in claim 1, wherein the operating power latching relay KB is of the type LADN40.
3. The isolating switch control circuit according to claim 1, further comprising an unlocking unit, wherein the unlocking unit comprises an interlocking input or unlocking knob switch SK2 and an unlocking relay K15;
the normally open auxiliary contact of the interlocking input or unlocking knob switch SK2 is connected in series to a coil loop of the unlocking relay K15 and is connected with two ends of the unlocking power supply;
the normally open auxiliary contact of the Jie Liansuo relay K15 is connected with a five-prevention locking normally open contact in parallel.
4. A disconnector control circuit according to claim 3, characterized in that the interlock input or release switch SK2 is of the type LW21-16 and the release relay K15 is of the type LADN40C.
5. An isolating switch control circuit as in claim 1, wherein said SF 6 The model of the pressure sensor GP1 is WIKAA-10/0-10MPa.
6. The isolating switch control circuit as in claim 1, further comprising a local on-off control knob switch SK1 and a local remote selection relay K1 and its auxiliary contacts;
the normally open auxiliary contact of the on-site switching-on/off control knob switch SK1 is connected in series in a coil loop of the on-site remote selection relay K1 and is connected with a control power supply unit;
two pairs of normally open auxiliary contacts and two pairs of normally closed auxiliary contacts of the local remote selection relay K1 are respectively and correspondingly connected in a closing and opening loop of the isolating switch.
7. The isolating switch control circuit of claim 6, wherein the remote in-situ selection relay K1 is CAD-32FDC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321879704.1U CN220710157U (en) | 2023-07-17 | 2023-07-17 | Isolating switch control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321879704.1U CN220710157U (en) | 2023-07-17 | 2023-07-17 | Isolating switch control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220710157U true CN220710157U (en) | 2024-04-02 |
Family
ID=90435960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321879704.1U Active CN220710157U (en) | 2023-07-17 | 2023-07-17 | Isolating switch control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220710157U (en) |
-
2023
- 2023-07-17 CN CN202321879704.1U patent/CN220710157U/en active Active
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