GIS and disconnecting link control circuit

Abstract

The utility model relates to a GIS and disconnecting link control circuit, and belongs to the technical field of high-voltage switch products. The control circuit comprises an opening instruction branch connected with an opening coil in series and a closing instruction branch connected with a closing coil in series, and measurement and control opening instruction outlets are connected between the opening instruction branch and the positive electrode of the control power supply and between the opening instruction branch and the negative electrode of the control power supply in series. Measurement and control closing instruction outlets are connected in series between the closing instruction branch and the control power supply positive electrode and between the closing instruction branch and the control power supply negative electrode. According to the utility model, original functional elements of the disconnecting link mechanism are adopted by the disconnecting link control circuit, so that the double-end control function of the disconnecting link is realized; and when the positive end is short-circuited to the ground, the grounding and the negative end of the operation circuit cannot form an operation loop, so that the safety and the reliability of knife switch control can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of GIS and knife switch control circuit, belong to high voltage switch product technical field, specifically related to a kind of double-end control circuit of GIS knife switch mechanism, can be widely applied in converter station high voltage GIS power station electrical control, improve the security and reliability of converter station GIS power station equipment operation. BACKGROUND

[0002] The safety operation level requirement in power system in converter station is very high, and high voltage GIS electrical equipment (Gas Insulated Switchgear, gas insulated switchgear) is also one of important equipment of converter station, and ensuring the safety controllability of GIS electrical equipment has very important significance to power grid system. Conventional GIS knife switch uses positive stage (or L end) control, and it is single-end control, cannot realize the requirement of double control of knife switch in converter station, and if ground short circuit appears in loop, knife switch misoperation risk can appear. INVENTION CONTENTS

[0003] The utility model aims at providing a kind of knife switch control circuit, to solve the problem that existing knife switch control circuit cannot realize double-end control;Also provide a kind of GIS, to solve the problem that there is knife switch misoperation risk when knife switch control loop is short-circuited to ground.

[0004] To achieve the above-mentioned purpose, the scheme of the utility model includes:

[0005] The technical scheme of a kind of knife switch control circuit of the utility model, including the branch circuit of disconnecting coil in series with disconnecting instruction branch and the branch circuit of closing coil in series with closing instruction branch, disconnecting instruction branch and control power supply anode, control power supply cathode between all series connection have the control disconnecting instruction outlet of measurement, closing instruction branch and control power supply anode, control power supply cathode between all series connection have the control closing instruction outlet of measurement.

[0006] Further, the control disconnecting instruction outlet of measurement and control power supply anode between and the control closing instruction outlet of measurement and control power supply anode between all series connection have the remote control contact of remote control switch;The control disconnecting instruction outlet of measurement and control power supply cathode between and the control closing instruction outlet of measurement and control power supply cathode between also all series connection have the remote control contact of remote control switch;

[0007] Disconnecting instruction branch and control power supply anode, control power supply cathode between still all series connection have manual disconnecting contact and the near control contact of remote control switch, closing instruction branch and control power supply anode, control power supply cathode between still all series connection have manual closing contact and the near control contact of remote control switch;

[0008] The remote control contact and near control contact of remote control switch between on-off state is always opposite.

[0009] Further, the holding branch of the knife switch control circuit comprises a positive side holding branch and a negative side holding branch;

[0010] The positive side holding branch comprises a first normally open contact of the opening coil and a first normally open contact of the closing coil, and one end of the opening instruction branch is directly connected to the positive pole of the control power source through the normally open contact of the opening coil, and one end of the closing instruction branch is directly connected to the positive pole of the control power source through the normally open contact of the closing coil;

[0011] The negative side holding branch comprises a second normally open contact of the opening coil and a second normally open contact of the closing coil in parallel, and the other end of the opening instruction branch is directly connected to the negative pole of the control power source through the negative side holding branch, and the other end of the closing instruction branch is directly connected to the negative pole of the control power source through the negative side holding branch.

[0012] The utility model discloses the beneficial effects are:

[0013] The utility model discloses a knife switch control circuit adopts the original function element of knife switch mechanism, realizes the double -ended control function of knife switch, when the positive end appears ground short -circuit, and ground and operating circuit negative end can not constitute operating loop, can improve the safety and reliability of knife switch control.

[0014] The utility model discloses a GIS's technical scheme, including knife switch control circuit, the knife switch control circuit includes the opening instruction branch with the opening coil in series and the closing instruction branch with the closing coil in series, the opening instruction branch with control power supply positive pole, control power supply negative pole between all series connection has the control opening instruction export, the closing instruction branch with control power supply positive pole, control power supply negative pole between all series connection has the control closing instruction export.

[0015] Further, the control opening instruction export and the control power supply positive pole between and the control closing instruction export and the control power supply positive pole between all series connection have the remote control contact of remote -control switch, the control opening instruction export and the control power supply negative pole between and the control closing instruction export and the control power supply negative pole between also all series connection have the remote control contact of remote -control switch;

[0016] The opening instruction branch and control power supply positive pole, control power supply negative pole between still all series connection have manual opening contact and the near control contact of remote -control switch, the closing instruction branch and control power supply positive pole, control power supply negative pole between still all series connection have manual closing contact and the near control contact of remote -control switch;

[0017] The remote control contact and the near control contact of remote -control switch between the on -off state is always opposite.

[0018] Furthermore, the holding branch of the knife switch control circuit includes a positive side holding branch and a negative side holding branch;

[0019] The positive side holding branch includes a first normally open contact of the trip coil and a first normally open contact of the closing coil. One end of the trip command branch is also directly connected to the positive terminal of the control power supply through the normally open contact of the trip coil, and one end of the closing command branch is also directly connected to the positive terminal of the control power supply through the normally open contact of the closing coil.

[0020] The negative side holding branch includes a second normally open contact of the trip coil and a second normally open contact of the closing coil connected in parallel. The other end of the trip command branch is also directly connected to the negative terminal of the control power supply through the negative side holding branch, and the other end of the closing command branch is also directly connected to the negative terminal of the control power supply through the negative side holding branch.

[0021] The beneficial effects of this utility model are as follows:

[0022] The GIS of this utility model uses the original functional elements of the knife switch mechanism in its knife switch control circuit to realize the dual-end control function of the knife switch; when a short circuit to ground occurs at the positive end, the ground and the negative end of the operation circuit cannot form an operation loop, which can improve the safety and reliability of the GIS knife switch control. Attached Figure Description

[0023] Figure 1 This is a circuit diagram of a knife switch control circuit according to this utility model. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in a clear and complete manner below with reference to the accompanying drawings and embodiments.

[0025] Circuit Example:

[0026] This embodiment uses the disconnection and opening control circuit of a GIS (Gas Grid Interconnection and Removal System) as an example to illustrate a disconnection control circuit of this utility model. Figure 1 As shown, the disconnector control circuit of this embodiment includes a disconnection and closing command branch, a locking circuit and a holding branch located in the GIS mechanism box, a positive disconnection and closing control branch located on the positive side (electrical +, L terminal) of the control power supply in the LCP cabinet (Local Control Panel), and a negative disconnection and closing control branch located on the negative side (electrical -, N terminal) of the control power supply in the LCP cabinet.

[0027] The opening and closing instruction branch includes an opening instruction branch and a closing instruction branch. The closing instruction branch includes a closing coil (A1-A2, A1-A2 are corresponding contact numbers, which are used to distinguish different contacts of the same device, and the same is used below) of a closing relay KE connected in series, a normally closed contact (22-21) of an opening relay KA for realizing opening and closing interlocking, and a normally closed contact (3-4) of a closing-to-position micro switch SLE; the opening instruction branch includes an opening coil (A1-A2) of the opening relay KA connected in series, the normally closed contact (22-21) of the closing relay KE for realizing opening and closing interlocking, and a normally closed contact (3-4) of an opening-to-position micro switch SLA.

[0028] The opening and closing instruction branches are respectively connected to the positive end opening instruction outlet and the positive end closing instruction outlet (XP1) of the positive end opening and closing control branch in the LCP cabinet (Local Control Panel, on-site control cabinet) after being led out from the mechanism box towards one end of the positive pole of the control power supply.

[0029] The other ends of the opening and closing instruction branches are connected to connect the first end of the locking loop, and the locking loop is used to realize, for example, anti-misoperation locking between the knife switch and the ground knife to prevent misoperation of the operator, thereby guaranteeing safe and stable operation of the power system. The locking loop is a locking loop in the prior art, and the embodiment will not be described again.

[0030] The second end of the locking loop is connected to the negative end opening and closing control branch in the LCP cabinet. The utility model sets up the opening and closing control branch on the positive and negative poles of the control power supply in the LCP cabinet, realizes double-end control of the knife switch control, improves the reliability of the knife switch control, and avoids the occurrence of misoperation of the knife switch caused by the loop-to-ground breaking.

[0031] The holding branch includes a positive pole side holding branch and a negative pole side holding branch, the negative pole side holding branch includes the normally open contact (53-54) of the closing relay KE and the normally open contact (53-54) of the opening relay KA connected in parallel, one end of the negative pole side holding branch connected in parallel is connected to the other end of the locking loop, and the other end of the negative pole side holding branch is connected to the negative pole side (electric-, N end) of the control power supply in the LCP cabinet.

[0032] The positive pole side holding branch includes the normally open contact (13-14) of the closing relay KE connected in series with the closing instruction branch and the normally open contact (13-14) of the opening relay KA connected in series with the opening instruction branch, and the other end of the normally open contact (13-14) of the closing relay KE and the normally open contact (13-14) of the opening relay KA is connected to the positive pole side (electric+, L end) of the control power supply in the LCP cabinet.

[0033] The holding branches for keeping power supply during the operation of the knife switch are also arranged on the positive side and the negative side respectively, so as to meet the double-end control of the knife switch opening and closing control circuit and improve the reliability of the knife switch control.

[0034] The positive end opening and closing control branch includes a positive end remote control branch and a positive end near control branch.

[0035] The positive end near control branch includes a positive end opening contact (3-4) of the manual handle SM1 connected with the positive end opening instruction outlet and a positive end closing contact (1-2) of the manual handle SM1 connected with the positive end closing instruction outlet (XP1).

[0036] The negative end opening and closing control branch includes a negative end remote control branch and a negative end near control branch.

[0037] The negative end near control branch includes the negative end opening contact (7-8) of the manual handle SM1 connected with the negative end opening command outlet and the negative end closing contact (5-6) of the manual handle SM1 connected with the negative end closing command outlet (XK1), and the other ends of the negative end opening contact (7-8) and the negative end closing contact (5-6) of the manual handle SM1 are connected to the negative side (electric-, N end) of the control power source through the normally open contact (17-18, negative end near control contact) of the far and near control switch SK2. When the negative end near control contact of the far and near control switch SK2 is closed, the other end of the opening command branch or the closing command branch is connected to the negative side of the control power source through the closing of the negative end opening contact (7-8) or the negative end closing contact (5-6) of the manual handle SM1.

[0038] As other embodiments, the normally closed and normally open contacts of the far and near control switch SK2 used as the far control and the near control can be interchanged, as long as the opening and closing states are always opposite.

[0039] The specific working principle is as follows:

[0040] When the far control is performed, the far and near control switch SK2 is switched to the closing of the far control contact (including the positive end far control contact 3-4 and the negative end far control contact 19-20).

[0041] When the measurement and control closing signal is sent, the positive end measurement and control closing command outlet is closed and conducted, the common end 1 of the measurement and control negative end outlet is connected to the closing tapping point 5; the closing command branch is connected to the positive and negative ends of the control power source, the closing coil (A1-A2) of the closing relay KE in the closing command branch is powered, the normally closed contact (22-21) of the closing relay KE in series in the opening command branch is opened, and the closing process is avoided from being mistakenly opened; at the same time, the normally open contact (13-14) of the closing relay KE and the normally open contact (53-54) of the closing relay KE in the positive side holding branch and the negative side holding branch are closed, the holding branch is connected, and when the instantaneous measurement and control closing signal disappears and the positive end measurement and control closing command outlet and the measurement and control negative end outlet are disconnected, the closing coil (A1-A2) of the closing relay KE is continuously powered through the self-locking holding, the closing operating mechanism is maintained, and the closing operation mechanism is not repeatedly responded to the closing control signal in the closing to position state until the knife switch is closed to position and the normally closed contact (3-4) of the closing to position micro switch SLE is opened, the closing command branch is disconnected, the closing coil (A1-A2) of the closing relay KE in the closing command branch is de-energized, all the contacts of the closing relay KE return to the normal state, and the far control closing process is ended.

[0042] After the knife switch leaves the opening position, the normally closed contact (3-4) of the opening to position micro switch SLA is restored to be closed, and the normally closed contact (3-4) of the closing to position micro switch SLE is kept in the open state after the closing to position, so that the operating mechanism will not be repeatedly responded to the closing control signal in the closing to position state.

[0043] When the control signal is sent, the positive control signal outlet is closed, and the negative control signal outlet is connected to the control point 6. The control signal branch is connected to the positive and negative ends of the control power supply, and the control coil (A1-A2) of the control relay KA in the control signal branch is powered on. The normally closed contact (22-21) of the control relay KA in series in the closing signal branch is disconnected to avoid the closing error during the opening process. At the same time, the normally open contact (13-14) of the control relay KA in the positive side holding branch and the normally open contact (53-54) of the closing relay KE in the negative side holding branch are closed, and the holding branch is connected. When the control signal disappears, the positive control signal outlet and the negative control signal outlet are disconnected, the closing coil (A1-A2) of the control relay KA is continuously powered through the self-locking holding, until the knife switch is opened to the position, the normally closed contact (3-4) of the opening micro switch SLA is disconnected, and the control signal branch is disconnected. At this time, the control coil (A1-A2) of the control relay KA in the control signal branch loses power, all contacts of the control relay KA return to the normal state, and the remote control opening process is completed.

[0044] After the knife switch leaves the closing position, the normally closed contact (3-4) of the closing micro switch SLE is closed again, and the normally closed contact (3-4) of the opening micro switch SLA is kept open after the opening. The operating mechanism will not repeatedly respond to the opening control signal in the opening state.

[0045] When the local control is performed, the remote and local control switch SK2 is switched to the local control contact (including the positive local control contact 1-2 and the negative local control contact 17-18) closed.

[0046] When the local control closing is performed, the manual handle SM1 in the LCP cabinet is pulled to the closing position, and the positive closing contact (1-2) and the negative closing contact (5-6) of the manual handle SM1 are closed at this time. The control signal branch is connected to the positive and negative ends of the control power supply, and the subsequent closing process is the same as that after the remote control closing signal branch is connected, which will not be described here.

[0047] When the local control opening is performed, the manual handle SM1 in the LCP cabinet is pulled to the opening position, and the positive opening contact (3-4) and the negative opening contact (7-8) of the manual handle SM1 are closed at this time. The control signal branch is connected to the positive and negative ends of the control power supply, and the subsequent opening process is the same as that after the remote control opening signal branch is connected, which will not be described here.

[0048] The utility model discloses a knife switch control circuit, the positive and negative both ends of control power supply are provided with the remote control's opening and closing of switch control export, still the positive and negative both ends of control power supply are provided with the opening and closing of switch contact of near control's manual opening and closing of switch handle, when not having near control and remote control's control instruction, the opening and closing of switch relay coil and the power supply positive and negative pole between all have the break, has improved the reliability of control circuit, has avoided the problem that if the single end break happens ground short circuit possibly leads to the malfunction, whether near control remote control or opening and closing of switch, simultaneously makes the positive and negative both ends of control power supply simultaneously connect the opening and closing of switch relay coil, has realized the double -ended control of knife switch.

[0049] Further, the utility model still sets up the keeping branch in the positive and negative pole both ends of control power supply, and the positive and negative pole's keeping circuit all have the break before the opening and closing of switch relay coil gets electricity, further improves circuit reliability and stability, avoids the malfunction caused by ground break.

[0050] GIS embodiment:

[0051] The utility model discloses a GIS, including LCP cabinet (Local Control Panel, just control cabinet) and GIS mechanism box, be provided with the opening and closing of switch instruction branch, locking loop and keeping branch in GIS mechanism box, be provided with the positive end opening and closing of switch control branch of control power supply positive pole side (electricity +, L end) and the negative end opening and closing of switch control branch of control power supply negative pole side (electricity -, N end) in LCP cabinet. Opening and closing of switch instruction branch, locking loop and keeping branch and positive end opening and closing of switch control branch, negative end opening and closing of switch control branch constitute the knife switch control circuit, and the knife switch control circuit has been introduced enough clearly in circuit embodiment, and this place will not repeat.

[0052] The utility model discloses a GIS knife switch control circuit is improved, realizes the double -ended control of knife switch control circuit, can avoid the risk of knife switch malfunction. Therefore the double control knife switch control circuit of the utility model is used to the GIS knife switch of converter station, can improve the safety and reliability of converter station operation.

Claims

1. A disconnector control circuit, comprising a disconnection command branch with a disconnection coil connected in series and a closing command branch with a closing coil connected in series, characterized in that, The tripping command branch is connected in series with the positive terminal of the control power supply, and the tripping command branch is connected to the negative terminal of the control power supply through the negative terminal of the tripping command output. When a tripping signal is sent, the positive terminal of the tripping command output is closed and connected, and the negative terminal of the tripping command output is connected to the negative terminal of the power supply. The closing command branch is connected in series with the positive terminal of the control power supply to the positive terminal of the closing command branch. The closing command branch is connected to the negative terminal of the control power supply through the negative terminal of the closing command branch. When a closing signal is sent, the positive terminal of the closing command branch is closed and connected, and the negative terminal of the closing command branch is connected to the negative terminal of the power supply.

2. The knife switch control circuit according to claim 1, characterized in that, The positive terminal tripping command output and the positive terminal of the control power supply are connected in series with remote control contacts of a remote control switch; the negative terminal tripping command output and the negative terminal of the control power supply are also connected in series with remote control contacts of a remote control switch. The tripping command branch is connected in series with the positive and negative terminals of the control power supply, and a manual tripping contact and a proximity control contact of the remote control switch are also connected in series with the positive and negative terminals of the control power supply. The remote control contact and the local control contact of the remote control switch are always in opposite states of opening and closing.

3. The knife switch control circuit according to claim 1, characterized in that, The holding branch of the knife switch control circuit includes a positive side holding branch and a negative side holding branch; The positive side holding branch includes a first normally open contact of the trip coil and a first normally open contact of the closing coil. One end of the trip command branch is also directly connected to the positive terminal of the control power supply through the normally open contact of the trip coil, and one end of the closing command branch is also directly connected to the positive terminal of the control power supply through the normally open contact of the closing coil. The negative side holding branch includes a second normally open contact of the trip coil and a second normally open contact of the closing coil connected in parallel. The other end of the trip command branch is also directly connected to the negative terminal of the control power supply through the negative side holding branch, and the other end of the closing command branch is also directly connected to the negative terminal of the control power supply through the negative side holding branch.

4. A GIS, characterized in that, The circuit includes a disconnector control circuit, which includes a disconnector command branch connected in series with a disconnector coil and a closing command branch connected in series with a closing coil. The disconnector command branch is connected in series with the positive terminal of the control power supply to a positive terminal measurement and control disconnector command output. The disconnector command branch is connected to the negative terminal of the control power supply through the negative terminal disconnector command output. When a measurement and control disconnector signal is sent, the positive terminal measurement and control disconnector command output is closed and connected, and the negative terminal disconnector command output is connected to the negative terminal of the power supply. The closing command branch is connected in series with the positive terminal of the control power supply to the positive terminal of the closing command branch. The closing command branch is connected to the negative terminal of the control power supply through the negative terminal of the closing command branch. When a closing signal is sent, the positive terminal of the closing command branch is closed and connected, and the negative terminal of the closing command branch is connected to the negative terminal of the power supply.

5. The GIS according to claim 4, characterized in that, The positive terminal tripping command output and the positive terminal of the control power supply are connected in series with remote control contacts of a remote control switch; the negative terminal tripping command output and the negative terminal of the control power supply are also connected in series with remote control contacts of a remote control switch. The tripping command branch is connected in series with the positive and negative terminals of the control power supply, and a manual tripping contact and a proximity control contact of the remote control switch are also connected in series with the positive and negative terminals of the control power supply. The remote control contact and the local control contact of the remote control switch are always in opposite states of opening and closing.

6. The GIS according to claim 4, characterized in that, The holding branch of the knife switch control circuit includes a positive side holding branch and a negative side holding branch; The positive side holding branch includes a first normally open contact of the trip coil and a first normally open contact of the closing coil. One end of the trip command branch is also directly connected to the positive terminal of the control power supply through the normally open contact of the trip coil, and one end of the closing command branch is also directly connected to the positive terminal of the control power supply through the normally open contact of the closing coil. The negative side holding branch includes a second normally open contact of the trip coil and a second normally open contact of the closing coil connected in parallel. The other end of the trip command branch is also directly connected to the negative terminal of the control power supply through the negative side holding branch, and the other end of the closing command branch is also directly connected to the negative terminal of the control power supply through the negative side holding branch.

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