I. Overview

XGN2-10 is a box-type fixed metal-enclosed switchgear (hereinafter referred to as switch cabinet) with a rated voltage of 12kV. It is used for receiving and distributing electric energy in three-phase AC 50Hz systems with voltage levels of 12kV and below. It is especially suitable for frequent operations. In this case, the bus system is single bus and single bus with bypass.

This switch cabinet complies with the requirements of GB3906 and IEC298, and has the "five prevention" interlocking functions proposed by the two departments.

The circuit breaker and operating mechanism combinations used in this switch cabinet are as follows:

ZN12-10 is equipped with CT100 special spring operating mechanism;

ZN28-10 is equipped with CD10Ⅱ electromagnetic operating mechanism, CT8Ⅱ spring operating mechanism, CT19 spring operating mechanism;

SN10-10 (Ⅰ, Ⅱ) is equipped with CD10Ⅱ electromagnetic operating mechanism, CT8Ⅱ spring operating mechanism and other series.

Its isolating switch adopts GN30-10 rotary isolating switch and GN22-10 isolating switch series according to the requirements of the fixed cabinet.

2. Normal use conditions

a) Indoor

b) Ambient air temperature: upper limit +40; lower limit -25℃

c) The altitude does not exceed 1000m (ZN28-10 with CD10 or CT8 can reach 2500m)

d) Relative humidity: the daily average value is not greater than 95%; the monthly average value is not greater than 90%.

e) The earthquake intensity does not exceed 8 degrees

f) Places without risk of fire, explosion, serious pollution, chemical corrosion and severe vibration.

Note: If the above normal usage conditions are exceeded, users can negotiate with the manufacturer to take corresponding measures according to their requirements.

3. Technical parameters

Technical parameters of switch cabinet (see Table 1)

Table 1

Circuit breaker technical parameters (see Table 2)

Table 2

Main technical parameters of the operating mechanism (see Table 3-Table 6)

Table 3 Main technical parameters of CD10Ⅱ DC electromagnetic operating mechanism

Table 4 Main technical parameters of CT100 special spring operating mechanism

Table 5 Main technical parameters of CT8Ⅱ spring operating mechanism

Table 6 Main technical parameters of CT19 spring operating mechanism

Technical parameters of the isolating switch (see Table 7）

table7           

Grounding switch technical data (see Table 8)

table8

Current transformer technical parameters (see Table 9--Table 10)

Table 9 Technical parameters of LZBJ12-10 current transformer

Table 10 Technical parameters of LMZJ1-10 current transformer

Technical data of voltage monitoring device (see Table 11)

   table 11

The technical parameters of the arrester are shown in Table 12

Table 12

Circuit breaker room:

The circuit breaker room is in the lower part of the cabinet, and the transmission of the circuit breaker room is connected by a pull rod and the operating mechanism; the lower terminal of the circuit breaker is connected to the current transformer, and the current transformer is connected to the terminal of the lower isolating switch; the upper terminal of the circuit breaker Connected to the terminals of the upper isolating switch, the circuit breaker chamber is also equipped with a pressure relief channel. If an internal arc occurs, gas can release the pressure through the exhaust channel.

Cable room:

The cable room is behind the lower part of the cabinet. The cable room supports insulators that can be equipped with probes for voltage monitoring devices. The cables are fixed on the brackets. When the main wiring is a contact plan, this room is the contact cable room.

Locking device to prevent misuse:

The operating mechanism of the circuit breaker is installed on the left side of the front. Above it is the operating and interlocking mechanism JSXGN of the isolating switch. It and the operating mechanism use mandatory machinery. The front door and back door are controlled by program locks. The entire interlock has a certain program. When using it, it must be operated according to the program, otherwise it cannot be operated. The specific action principle is as follows:

Power supply operation (inspection → operation)

If the maintenance has been completed and power needs to be supplied, the operating procedures are as follows:

Close and lock the back door, take out the key and close the front door. Move the small handle from the inspection position to the "breaking and locking" position. At this time, the front door is locked and the circuit breaker cannot be closed. Use the operating handle to insert into the grounding switch operating hole. Pull up and down to put the grounding switch in the open position, take off the operating handle and insert it into the operating hole of the isolating switch, push it from bottom to up, so that the isolating switch is in the closing position (operate the upper isolating switch first or operate the lower isolating first) The switch

 is determined by the user's requirements), take out the operating handle, and move the small handle to the "working" position. At this time, the circuit breaker can be closed and put into operation.