概述   Outline

XGN7-12 箱型固定式金屬開關設備（簡稱開關柜），用于 3.6、7.2、12kV 三相交流 50Hz 系統中作為接受與分配電能之用，特別適合于頻繁操作 的場合，其母線系統為單母線（并可派生出單母線帶旁路和雙母線結構）。 

本開關柜符合國家標準 GB3906《3-35kV 交流金屬封閉開關設備》及 IEC298 的標準要求，并達到“五防”閉鎖功能。 

本開關柜的主開關采用 ZN28A-12 或 ZN22-12 系列真空斷路器配用 CD17A 電磁操作機構和 CT19B 彈簧操作機構，隔離開關采用 GN30-12 旋轉式 隔離開關、GN22-10 大電流隔離開關系列產品。

XGN7-12 box fixed type metal-enclosed switchgear (switch cabinet for short) is used to receive and distribute electrical energy in 3.6, 7.2, 12KV three phase AC 50Hz system , specially in the frequ-ent operation occasion . 

Its bus bar system is single bus bar and it can derive single bus bar with branch and double bus bar structure. 

This switch cabinet conforms to the requirement of national standard GB3906-91 “3-35kV AC Metal Seal Switch equipment”and the international standard IEC298, and has the functionof “five prevention”. 

This switch cabinet's main switch is composed of ZN28A-12 Yu or the ZN22-12 series vacuum circuit breaker, the CD17A spring operating mechanism and the CT19B spring operating mechanism, the GN30-12rotary isolator and the GN22-10 big electric current isolator series product.

使用環境條件   Use environmental conditions

1、環境溫度：上限 +40℃，下限 -25℃； 

2、海拔高度不超過 1000m； 

3、相對濕度：日平均值不大于 95%；月平均值不大于 90%； 

4、地震烈度不超過 8 度； 

5、沒有火災、爆炸危險和污染。

1. Ambient temperature:-25℃～ +40℃ ; 

2. Altitude is not higher than 1000M; 

3. Relative environment humidity: The daily relative humidity average is not higher than 95%;The monthly relative humidity average is not than higher 90%; 

4. The earthquake s intensity does not exceed 8 degree. 

5. Without fire, the danger of explosion, chemical corrosion and fierce vibration place and the pollution grade not beyond 3 level.

型號及含義  Model and meaning

主要技術參數   The main technical parameters

開關柜主要技術參數見表 1 Switch cabinet ' s main technical parameters

結構特點 Structural features

XGN7-12 開關柜為金屬封閉箱式結構 , 柜體骨架由角鋼焊接而成 , 柜內分為斷路室、母線室、電纜室、繼電器室等，室與室之間用鋼板隔開。 

1、斷路器室在柜體前下部，斷路器的轉動由拉桿與操動機構連接，斷路器上接線端子與上隔離開關連接，斷路器下接線端子與電流互感器連接，電流 互感器與下隔離開關接線端子連接，斷路器室還設有壓力釋放通道，若內部電弧發生時，氣體可通過排氣通道將壓力釋放。 

2、母線室在柜體后上部，為了減小柜體高度，母線呈品字形排列，以 7350N 抗彎強度的瓷質絕緣子支持，母線與上隔離開關接線端子相連接，相鄰 兩柜母線室之間可隔離。 

3、電纜室在柜體下部的后方，電纜室內支持絕緣子可設有電壓監視裝置，電纜固定在支架上，對于主接線為聯絡方案時，本室則為聯絡電纜室，繼電 器室在柜體上部前方，室內安裝板可安裝各安裝各種繼電器等，室內有端子排支架，門上可安裝指示儀表、信號元件等二次元件，頂部還可布置二次 小母線。 

4、斷路器的操動機構裝在正面左邊位置，其上方為隔離開關的操作及聯鎖機構，開關柜為雙面維護，前面檢修繼電器室的二次元件，維護操動機構， 機械聯鎖及傳動部分，檢修斷路器，后面維修主母線和電纜終端，在斷路器室裝有照明燈，前門的下方設有與柜寬方向平行的接地銅母線，其截面為 4×40mm。 

5、機械聯鎖：為了防止帶負荷分合隔離開關，防止誤分誤合斷路器，防止誤入帶電間隔；防止帶電合接地開關；防止帶接地刀合閘，開關柜采用相應 的機械聯鎖，機械聯鎖的動作原理如下： 

(1) 停電操作（運行 - 檢修） 開關柜處于工作位置，即上下隔離開關、斷路器處于合閘狀態，前后門已鎖好，并處于帶電運行之中，這時的小手柄處于工作位置，先將斷路器分閘 后，再將小手柄插入下隔離的操作孔內從上往下拉，拉到下隔離分閘位置，將手柄拿下，再插入上隔離操作孔內，從上往下拉，拉到上隔離分閘位置， 再將操作手柄拿下，插入接地開關操作孔內，從下向上推，使接地開關處于合閘位置，這時可將小手柄扳至“檢修”位置，可先打開前門，取出門后 邊鑰匙打開后門，停電操作完畢，體修人員對斷路器室及電纜室進行維護和檢修。 

(2) 送電操作（檢修 - 運行） 若已檢修完畢，需要送電，其操作程序如下： 將后門關閉，鑰匙取出后關前門，將小手柄從“檢修”位置扳到“分斷閉鎖”位置，這時前門被鎖定，斷路器不能合閘，用操作手柄插入接地開關操 作孔內，從上向下拉，使接地開關處于分閘位置，將操作手柄拿下，再插入上隔離的操作孔內，從下向上推，使上隔離處于合閘位置，將操作手柄拿下， 插入下隔離的操作孔內，從下向上推，使下隔離處于合閘拉置，取出操作手柄，將小手柄板至工作位置，這時可將斷路器合閘。 

6、產品外形尺寸及結構圖 ( 見圖 1、圖 2、圖 3)

XGN7-12 switch cabinet is the metal-enclosed box structure, its cabinet frame is welded together by the angle iron, the cabinet inside is divided into breaker room, bus bar room, cable room, relays room and so on .Rooms are separated by armor plate.

1、 The circuit breaker room is located below in front of the cabinet body.It is connected by the tension bar and the drive mechanism. Line terminal above the breaker connects with isolated switch.Line terminal below the breaker connects with the current mutual inductance which connects isolated switchs line terminal. The circuit breaker room also is equipped with the pressure release channel, if internal electric arc it occurs, the gas passable exhaust channel released the pressure through exhaust channel. 

2 、Bus bar room is behind, upside cabinet body. .In order to reduce the cabinet body altitude, bus bar room shows itself like the word “品”supported by the 7350N anticurved intensity porcelain insulator . Bus bar connects with upside insulated switch's line terminal. Bus bar room in neighboring two cabinets can be isolable. 

3 、The cable room is behind and below the cabinet body. The supporting Insulator inside the cable room may be equipped with the voltage monitor device. The electric cable fixes on the support. When the main line is used to connect, this room is connecting cable room. The relay room is upside and in front of the cabinet body. The installing panel inside the cable room can install each kind of the relay. There are terminal supporters inside. The door of the cable room can be installed indication instrument, the signal part and other twice parts. The top can be installed twice small busbar. 

4 、circuit breaker s drive mechanism is installed face and left side of the breaker. Above it is isolated switch s operation and the interlocking mechanism. The switch cabinet is the two-sided maint-enance. The front is twice component checking and repairing relay room and breaker, maintaining the drive mechanism, interlocking mechanism and transmission parts; the back is repairing the main bus bar and cable terminal. There is head lamp inside the breaker .The downside of front door is equipped with bus bar connected by copper paralleling with cabinet. The section is 4×40mm. 

5 、mechanical interlocking: In order to prevent the load from turning on and off the isolated switch and the circuit breaker by mistake, prevent from isolating with charge and earthed switch with charge and turning on the knife switch. The switch cabinet uses the corresponding mechanical interlocking. The mechanical interlocking movement principle as follows: 

(1) power-cut operation (operation - examination) The switch cabinet is in the working position, namely the upside and downside isolated switch , the circuit breaker are at turn-on condition, the front and back door has been locked and at electriferous condition, at this time , the small handle was in the working position. First, turn the breaker off, insert the small handle into downside isolated operation hole, then pull to the isolated turn-off position from down to up. Then take the handle down, insert the handle into upside isolated operation hole, pull to the isolated turn-off position from up to down. Then take the handle down and insert it into switch hole, push from down to up to make the switch turn off. At this time, pull the small handle to the “examination and repair condition. Then open the front door first, then open the back door, the power cut operation finish, the examiner maintain and repair the breaker and the cable room. 

(2) Power transmission operation (examination repair - movement) If examination repair operation has finished, the power transmission is needed, its operation procedure as follows: Close the back door, after the key is taken out, close the front door, pull the small handle from “the examination repair” position to disjunction and closedown” position, at this time the front door is locked, the circuit breaker cannot be turned on. Insert the operation handle to the earthed switch operational hole, push the upside isolator to the turn on position from down to up, take the operation handle out and insert into the downside isolating operational hole, pull the downside isolator to the turn-on operation from down to up and take the operational handle out, pull the small handle to the operation position, at this time, turn the breaker on. 

6 、Product s external dimensions and the structure chart (see chart 1, chart 2, chart 3)

外形及安裝尺寸   Outline & Mounting Dimensions

圖 1 XGN7-12 外形尺寸及結構圖  Diagram 1 Outline size and structure of XGN7-12 type

圖 2 XGN7-12 大電流柜外形結構圖（配用 ZN28A 系列真空斷路器） Diagram 2 Outline structure of XGN7-12 heavy current cabinet (equipped with ZN28A series vacuum circuit breaker)

 圖 3 XGN7-12 旁路電纜出線柜外形結構圖   Diagram 3 Outline structure of XGN7-12 bypass cable outgoing cabinet

圖 4 XGN7-12 型安裝尺寸圖   Diagram 4 Mounting size of XGN7-12 type

 圖 5 XGN7-12 型安裝尺寸圖   Diagram 5 Mounting size of XGN7-12 type