變壓器中性點隔離開關，GW8、GW13系列中性點隔離開關。GW8-40.5、GW8-72.5、GW8-126W型中性點隔離開關係單相交流50Hz高壓開關設備，額定電流：630A、1250A。在有電壓無負載的情況下，作分、合變壓器中性點接地線路之用。也供鐵道自動閉塞信事情裝置時使用。並可單級使用。其中防污型的隔離開關可以滿足重污穢地區用戶的要求，並可以有效地解決隔離開關在運行中出現的污閃問題。

    變壓器中性點隔離開關分為普通型和防污型（W）兩種;

    變壓器中性點隔離開關所配用的操作機構為:CS8-5型手動操動機構或CX6型電動機操動機構;CS17-G型手動操動機構或CJ2、CJ5、CJ6、CJ12型電動機操動機構。

    GW13-72.5、GW13-126、GW13-40.5系列中性點隔離開關，是交流50HZ戶外裝置，供在無載荷情況下，分、合變壓器中性點聯線之用。本隔離開關分為普通型和耐污型兩種。
    本隔離開關性能可靠，結構簡單，規格齊全。根據用戶需要可採用手動操作機構或電動操作機構進行操作。手動操作機構為CS17-G型，電動操作機構為CJ12A-G免維護型或CJ2,CJ6,CJ16A型。CS17-G型手動操作機構可以附裝DSW4-Y型電磁鎖，以實現電氣聯鎖，防止電氣誤操作。CJ12A-G免維護型及CJ2,CJ6,CJ16A型電動操作機構另見其說明書。

GW13 and GW8 series type neutral point disconnecting switchis outdoor high-voltage equipment with 50-60Hz frequency. Itis used for making and breaking the link of transformer’s neutral point under the condition without load. It is suitable for AC power-frequency network.

This product complies with Standard GB1985-89 and Standard IEC-129(1984). The character of it is reliable, the operation of it is safe, and it is very convenient to install or adjust it. It is widely used in 63-110KV substation. According to user ' s demand，it can use cooperatively the CS17-G type manual operation mechanism or the CJ11A-G type maintenance-free electro-control mechanism,the other electro-control mechanism is CJ2,CJ6,CJ16 type. The CS17-G type manual operation mechanism can attach DSW4-Y electromagnetism lock, so as to implement electric interlocking and avoid electric misoperation.

變壓器中性點隔離開關的放電間隙測試：

Clearance discharging detecting:

           工頻放電電壓試驗：

           Working-frequency discharging voltage test:

    在試驗變壓器原邊串聯一塊10A及以上的電流表。在間隙的進線端子與接地端子N之間施加工頻電壓，試驗時施加到放電間隙的電壓應從零開始，在高壓側能準確讀數的條件下，迅速升壓到間隙放電為止（觀察電流表，當電流發生突變時，表明間隙放電，此刻的電壓值應為工頻放電電壓值）。每次放電后，應在0.2秒內切斷工頻電源。每連續兩次試驗時間間隔不小於10S，測量次數為3次.每次所測的放電電壓值應符合規定。

A ammeter which is more than 10A installs in series on a test transformer’s primary boundary. impose working-frequency voltage on the clearance between inlet line terminal and earth terminal “N”, voltage must  start from zero. Under correct reading of the condition on the high voltage side, boost voltage to the gap discharge quickly(observe ammeter,when current occur mutation, the results show that air gap discharge, at the moment voltage value of the ammeter is equal to working-frequency discharging voltage value). After each discharge, must cut fundamental frequency power supply immediately during 0.2s. Interval time of each continual twice is not less than 10s, determination times is 3 times, the discharging voltage value which is determined each time must accords with regulation.

注：Attention:

如果工頻放電電壓值超出範圍，可對間隙進行微調。

If the working-frequency discharging voltage value exceed normal range,can faintly adjust the discharge gap.

在上述試驗過程中無沿面放電、閃絡現象，參數符合要求即為合格。

There is no surface discharge and flashover phenomenon during all the above test process. If parameters meet the requirement, namely make the products up to standard.

變壓器中性點隔離開關。