CN117095964A - Isolating switch control circuit and control method - Google Patents

Isolating switch control circuit and control method Download PDF

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Publication number
CN117095964A
CN117095964A CN202310882145.8A CN202310882145A CN117095964A CN 117095964 A CN117095964 A CN 117095964A CN 202310882145 A CN202310882145 A CN 202310882145A CN 117095964 A CN117095964 A CN 117095964A
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CN
China
Prior art keywords
relay
normally open
pressure
isolating switch
low
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310882145.8A
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Chinese (zh)
Inventor
梁总
梁邦囯
黄文斐
刘德干
陈振才
莫树良
蔡琼锋
黎经鹏
杨生信
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongfang Power Plant of Huaneng Hainan Power Generation Co Ltd
Original Assignee
Dongfang Power Plant of Huaneng Hainan Power Generation Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dongfang Power Plant of Huaneng Hainan Power Generation Co Ltd filed Critical Dongfang Power Plant of Huaneng Hainan Power Generation Co Ltd
Priority to CN202310882145.8A priority Critical patent/CN117095964A/en
Publication of CN117095964A publication Critical patent/CN117095964A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/02—Details

Abstract

The invention discloses an isolating switch control circuit and a control method, wherein the isolating switch control circuit comprises a low-pressure locking unit, an electric five-prevention locking unit, an operating power locking unit and an unlocking 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 a 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. Is used for solving the problem of SF generation in a QF air chamber of a 220kV breaker in the background art 6 The invention ensures SF in a QF air chamber of a 220kV circuit breaker under the condition of low air pressure 6 Under the condition of too low gas pressure, the high-voltage isolating switch is chargedAnd the closing is closed, so that the normal operation of the electric primary equipment and the electric power system is ensured.

Description

Isolating switch control circuit and control method
Technical Field
The invention belongs to the technical field of power systems, and particularly relates to a control circuit and a control method of an isolating switch.
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 invention provides a control circuit and a control method of an isolating switch, which are used for solving the problem that SF occurs in a QF air chamber of a 220kV circuit breaker in the background art 6 The invention ensures SF in a QF air chamber of a 220kV circuit breaker under the condition of low air pressure 6 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 ensuredAnd (3) row.
In order to achieve the above purpose, the present invention 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 a 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;
and 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.
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.
Preferably, the SF 6 The model of the pressure sensor GP1 is WIKA A-10/0-10MPa; the model of the low-pressure latching relay K16 is UM72-R-120UC.
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 with the coil loop of the on-site remote selection relay K1 and is connected with the 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.
A control method of an isolating switch control circuit, based on any one of the above isolating switch control circuits, comprising the following processes,
SF in breaker air chamber 6 When the pressure monitor GP1 monitors that the SF6 insulating gas pressure is lower than a preset value, SF 6 The normally open auxiliary contact of the pressure monitor GP1 is closed, the coil of the low-pressure locking relay K16 is electrified, the normally open auxiliary contact of the low-pressure locking relay K16 is opened, and the closing loop of the isolating switch is locked;
SF in breaker air chamber 6 When the pressure monitor GP1 monitors that the SF6 insulating gas pressure meets the preset requirement, the normally open auxiliary contact of the low-pressure latching relay K16 is closed, and the isolating switch is normally closed.
Preferably, when the isolating switch is switched on and off in an empty way of the 220V alternating-current operation power supply unit LN, the coil of the operation power supply locking relay KB is electrified, the normally open auxiliary contact of the operation power supply locking relay KB is closed, and the isolating switch is normally switched on; when the isolating switch alternating current 220V operation power supply unit LN is opened and disconnected, the normally open auxiliary contact of the operation power supply latching relay KB is disconnected, and the isolating switch closing loop is latched.
Preferably, when the interlocking input or unlocking knob switch SK2 is driven to an unlocking position, a normally open auxiliary contact of the interlocking input or unlocking knob switch SK2 is closed, a coil of the unlocking relay K15 is powered on, a normally open auxiliary contact of the Jie Liansuo relay K15 is closed, and at the moment, the isolating switch can be switched on and off without five-prevention locking; when the interlocking knob switch SK2 is put into or released from interlocking, the Jie Liansuo relay K15 is powered off, the Jie Liansuo relay K15 normally open auxiliary contact is disconnected, and the isolating switch can be switched on or off only when the five-prevention locking condition is met.
Preferably, when the local remote transfer switch SK1 is switched to a remote position, the normally open auxiliary contact of the SK1 is disconnected; remotely selecting a relay K1 coil to lose electricity in situ, and closing a normally closed auxiliary contact; at this time, the isolating switch is in a switching-off state; when the low-pressure locking unit and the five-prevention locking unit meet the requirements at the same time, the normally-open auxiliary contact and the five-prevention locking normally-open contact 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 of the low-pressure locking relay K16 and the normally open contact of the unlocking relay K15 are also in a closed state;
at the moment, if the remote closing logic condition is met, the normally open auxiliary contact of the remote closing instruction is closed, at the moment, the normally open auxiliary contact of the closing relay KE in the operation circuit is turned and closed, the coil of the motor M obtains AC220V voltage, the motor M rotates positively, and the isolating switch realizes remote closing.
Preferably, when the local remote transfer switch SK1 is switched to the local position, the normally-open auxiliary contact of the SK1 is disconnected; remotely selecting a coil of the relay K1 to be electrified in situ, and closing the coil and a normally open auxiliary contact; at the moment, the isolating switch is in a brake separating state, and the auxiliary contact of the brake separating relay KA is in a closed state; when the low-pressure locking unit and the five-prevention locking unit meet the requirements at the same time, the normally-open auxiliary contact and the five-prevention locking normally-open contact 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 of the low-pressure locking relay K16 and the normally open contact of the unlocking relay K15 are also in a closed state; at the moment, if the remote closing logic condition is met, the normally open auxiliary contact of the remote closing instruction is closed, at the moment, the coil of the closing relay KE is electrified, the normally open auxiliary contact of the closing relay KE in the operating circuit is turned over and closed, the coil of the motor M obtains AC220V voltage, the motor M rotates positively, and the isolating switch realizes on-site closing.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention 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 the 220kV breaker QF air chamber is prevented from being closedSF 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 invention.
Fig. 2 is a schematic diagram of a release unit and a low-pressure locking unit of the isolating switch control circuit of the invention.
Fig. 3 is a schematic diagram of an operation power supply locking unit of the isolation switch control circuit according to the present invention.
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 invention.
Detailed Description
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
Examples
As shown in fig. 1 to 5, the novel 220kV isolating switch control circuit of the present invention 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 separating brake contactorThe KA coil control power supply is DC110V, and is taken from a direct current 110V 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 WIKA A-10/0-10MPa. The model of the low-pressure latching relay K16 is UM72-R-120UC, and the coil power supply is DC110V.
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 － The interlocking input or unlocking knob switch SK2 and the unlocking 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 LADN4OC.
The invention 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 invention 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 a 220kV I bus, a 220kV II bus, an I-bus isolating switch QSF1 and an II-bus isolating switch QSF2, a breaker QF, a bus-side grounding disconnecting link QE1, a line-side grounding disconnecting link QE2 and other electric primary devices, which form 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 invention 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 invention 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. On the contrary, when the interlocking input or the unlocking knob switch SK2 is switched to the interlocking position, the Jie Liansuo relay K15 is powered off, normally open auxiliary contacts (13 and 14) of the unlocking relay K15 in the disconnecting switch opening and closing schematic diagram are disconnected, and the disconnecting switch can be opened and closed 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 figures 4 and 5, the embodiment of the invention provides a brand new 220kV isolating switchAnd the isolating switch opening and closing schematic diagram of the 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 － Remote closing command normally open auxiliary contacts (M2, N2) are connected in series, and are connected with normally open auxiliary contacts (13, 14) of a local remote selection relay K1, normally closed auxiliary contacts (21, 22), opening relay KA auxiliary contacts (51, 52), closing relay KE coils (A1, A2) and a low-pressure locking relay K16.
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 this time, the disconnecting switch is in a disconnecting state, and auxiliary contacts (51, 52) of the disconnecting relay KA are disconnected. 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. This time intervalThe off-switch is in a closing state, and 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 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 remote opening is realized by the isolating switch.
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 satisfied, 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, the normally open auxiliary contacts (23, 24), (33, 34) of the closing relay KE in the operation circuit in FIG. 5 are turned on, the normally closed auxiliary contacts (71, 72) of the closing relay KE are opened, and the coils (D1, D2) of the motor M are obtainedThe AC220V voltage is obtained, the motor M rotates positively, and the isolating switch realizes on-site switching.
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 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 invention 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 invention 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, the operation stability of primary equipment is improved, and the operation is ensuredThe 220kV power system is safe and stable to operate.

Claims (10)

1. An isolating switch control circuit is characterized by comprising 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 a 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.
2. The isolation switch control circuit according to claim 1, further comprising an operation power supply blocking unit including an operation power supply blocking relay KB;
and 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.
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. 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; the model of the low-pressure latching relay K16 is UM72-R-120UC.
5. 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 with the coil loop of the on-site remote selection relay K1 and is connected with the 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.
6. A control method of an isolating switch control circuit, characterized in that, based on an isolating switch control circuit as claimed in any one of claims 1 to 5, comprising the following process,
SF in breaker air chamber 6 When the pressure monitor GP1 monitors that the SF6 insulating gas pressure is lower than a preset value, SF 6 The normally open auxiliary contact of the pressure monitor GP1 is closed, the coil of the low-pressure locking relay K16 is electrified, the normally open auxiliary contact of the low-pressure locking relay K16 is opened, and the closing loop of the isolating switch is locked;
SF in breaker air chamber 6 When the pressure monitor GP1 monitors that the SF6 insulating gas pressure meets the preset requirement, the normally open auxiliary contact of the low-pressure latching relay K16 is closed, and the isolating switch is normally closed.
7. The control method of an isolating switch control circuit according to claim 6, wherein when an isolating switch alternating current 220V operation power supply unit LN is turned on empty, an operation power supply latching relay KB coil is powered on, a normally open auxiliary contact of the operation power supply latching relay KB is closed, and the isolating switch is normally closed; when the isolating switch alternating current 220V operation power supply unit LN is opened and disconnected, the normally open auxiliary contact of the operation power supply latching relay KB is disconnected, and the isolating switch closing loop is latched.
8. The control method of an isolating switch control circuit according to claim 6, wherein when the interlocking input or the unlocking knob switch SK2 is driven to an unlocking position, a normally open auxiliary contact of the interlocking input or the unlocking knob switch SK2 is closed, a coil of the unlocking relay K15 is electrified, a normally open auxiliary contact of the Jie Liansuo relay K15 is closed, and at the moment, the isolating switch can be opened and closed without five-prevention locking; when the interlocking knob switch SK2 is put into or released from interlocking, the Jie Liansuo relay K15 is powered off, the Jie Liansuo relay K15 normally open auxiliary contact is disconnected, and the isolating switch can be switched on or off only when the five-prevention locking condition is met.
9. The control method of an isolating switch control circuit as in claim 6, wherein when the local remote switch SK1 is turned to the remote position, the normally open auxiliary contact of SK1 is opened; remotely selecting a relay K1 coil to lose electricity in situ, and closing a normally closed auxiliary contact; at this time, the isolating switch is in a switching-off state; when the low-pressure locking unit and the five-prevention locking unit meet the requirements at the same time, the normally-open auxiliary contact and the five-prevention locking normally-open contact 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 of the low-pressure locking relay K16 and the normally open contact of the unlocking relay K15 are also in a closed state;
at the moment, if the remote closing logic condition is met, the normally open auxiliary contact of the remote closing instruction is closed, at the moment, the normally open auxiliary contact of the closing relay KE in the operation circuit is turned and closed, the coil of the motor M obtains AC220V voltage, the motor M rotates positively, and the isolating switch realizes remote closing.
10. The control method of an isolating switch control circuit as in claim 6, wherein when the local remote switch SK1 is on-site, the normally open auxiliary contact of SK1 is opened; remotely selecting a coil of the relay K1 to be electrified in situ, and closing the coil and a normally open auxiliary contact; at the moment, the isolating switch is in a brake separating state, and the auxiliary contact of the brake separating relay KA is in a closed state; when the low-pressure locking unit and the five-prevention locking unit meet the requirements at the same time, the normally-open auxiliary contact and the five-prevention locking normally-open contact 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 of the low-pressure locking relay K16 and the normally open contact of the unlocking relay K15 are also in a closed state; at the moment, if the remote closing logic condition is met, the normally open auxiliary contact of the remote closing instruction is closed, at the moment, the coil of the closing relay KE is electrified, the normally open auxiliary contact of the closing relay KE in the operating circuit is turned over and closed, the coil of the motor M obtains AC220V voltage, the motor M rotates positively, and the isolating switch realizes on-site closing.
CN202310882145.8A 2023-07-17 2023-07-17 Isolating switch control circuit and control method Pending CN117095964A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310882145.8A CN117095964A (en) 2023-07-17 2023-07-17 Isolating switch control circuit and control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310882145.8A CN117095964A (en) 2023-07-17 2023-07-17 Isolating switch control circuit and control method

Publications (1)

Publication Number Publication Date
CN117095964A true CN117095964A (en) 2023-11-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310882145.8A Pending CN117095964A (en) 2023-07-17 2023-07-17 Isolating switch control circuit and control method

Country Status (1)

Country Link
CN (1) CN117095964A (en)

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