Model and meaning
Conditions of use
a. Ambient air temperature: -15℃~+40℃;
b. Altitude: 1000M and below;
c. Temperature conditions: the daily average value is not more than 95% water vapor, and the daily average pressure is not more than 2.2kPa. The monthly average value does not exceed 90% water vapor, and the monthly average pressure does not exceed 1.8kPa
. d. A place where the surrounding air is not significantly polluted by corrosive or flammable gases, water vapor, etc.;
e. There is no frequent violent vibration.
Structural features
This ring main unit uses air as the insulating medium and is mainly equipped with a ZFN port-10/630 vacuum load switch. The main solutions include incoming cabinets and outgoing cabinets (see Table 2)
1. Incoming cabinet solution
The main circuit in the cabinet is composed of a ZFN-10/630 vacuum load switch, equipped with an isolation knife and a grounding knife where appropriate. The three are installed on a frame and interlocked with each other. Therefore, the three operations of busbar connection, isolation and grounding can be realized, and CT, PT and other components can also be flexibly assembled in the cabinet.
2. Outlet cabinet solution
The main circuit in the cabinet is composed of a ZFN-10/630 vacuum load switch, a fuse with an impactor (functioning as an isolating switch) and a grounding knife. Three-station operation is also possible. CT/PT and ZNO arrester components can also be flexibly assembled in the cabinet, so the metering cabinet can be omitted. The incoming and outgoing line cabinets are equipped with insulating protective partitions that are interlocked with the grounding switch. Each switch in the cabinet is mechanically interlocked with the partitions and cabinet doors and meets the five-proof requirements. The protection level of the cabinet shell is IP2X.
Technical parameters
|
project
|
unit
|
data
|
|
Rated voltage/maximum working voltage
|
KV
|
10/12
|
|
Rated current
|
A
|
630
|
|
Main bus current
|
Incoming cabinet
|
A
|
630
|
|
Outlet cabinet
|
125
|
|
Rated short-time withstand current
|
THE
|
20
|
|
Rated short circuit duration
|
S
|
4
|
|
Rated peak withstand current
|
THE
|
50
|
|
Rated short circuit making current
|
THE
|
50
|
|
Rated active load breaking current
|
A
|
630
|
|
Closed loop breaking current
|
A
|
630
|
|
Rated cable charging power
|
THE
|
20
|
|
Rated short-time withstand current of earthing switch
|
THE
|
20
|
|
Rated short circuit duration of earthing switch
|
S
|
4(2)
|
|
Rated peak withstand current of earthing switch
|
THE
|
50
|
|
Rated short-circuit making current of earthing switch
|
THE
|
50
|
|
1min rated power frequency withstand voltage
|
Phase-to-phase, phase-to-ground, vacuum load switch break, isolating switch break
|
THE
|
42
|
|
48
|
|
Rated lightning impulse withstand voltage
|
Phase-to-phase, phase-to-ground, vacuum load switch break
|
THE
|
75
|
|
Isolating switch fracture
|
85
|
|
Mechanical life
|
Vacuum load switch
|
Second-rate
|
10000
|
|
Grounding switch (knife) Isolating switch (knife)
|
2000
|
|
AC current
|
A
|
3150
|
Lifting, installation, commissioning and fuse replacement
1. Lifting
Before lifting, unpack and inspect according to regulations. When lifting the cabinet, follow the operation marking requirements, handle with care, and protect against shocks.
2.Installation
After unpacking, check whether the cabinet and the components inside the cabinet are in good condition, operate normally, and whether they are affected by moisture. Installation can only begin after confirmation.
3. Debugging
If it is found that the components in the cabinet do not meet the technical requirements or the interlocking is not in place, debugging must be carried out according
a. For the load switch, grounding switch or isolation switch, the length of the pull rod can be adjusted and the angle and position of the pull rod and operating rod can be changed. To meet the technical requirements:
b. If the interlock is not in place, the length of the corresponding operating rod can be fine-tuned to change the position of the interlock hole so that the interlock is in place.
4. Replace the fuse
The power outage operation sequence must be strictly followed. First, open the load switch, then open the fuse to the isolation position, close the grounding switch, and then insert the insulation protection cover. The cabinet door can be opened before the fuse can be replaced.
Usage and troubleshooting
1. Usage
Please be sure to strictly follow the following steps, otherwise damage may easily occur. The operating sequence of the load switch
is a. Closing: When the load switch is in the open state, insert the operating handle into the operating hole of the load switch and turn it clockwise (about 180 degrees) to make it close;
b. Breaking: When the load switch is in the closing state, a manual trip button or a trip electromagnet can be operated to open the load switch. For a load switch equipped with a fuse with an impactor, after the fuse is blown, the load switch will open. The impactor can also open the load switch.
2. Power outage operation sequence
a. Open the load switch and release the interlock between it and the isolation and grounding switch
. b. Insert the operating handle into the operating hole of the isolation and grounding switch and turn it clockwise (about 90 degrees). , the isolation knife is opened;
c. Turn clockwise again (about 90 degrees), and the grounding switch closes quickly
d. Insert the insulating partition to release the door interlock
e. Open the door for maintenance.
3. Power supply operation sequence
a. Close the cabinet door;
b. Pull out the insulating partition and lock the cabinet door;
c. Insert the operating handle into the operating hole of the isolation and grounding switch and turn it counterclockwise
Move (about 90 degrees) to open the grounding switch;
d. Operate the load switch, close it and send power.
4.Troubleshooting
During the operation of the ring main unit, if the outlet wires are loosened, the mechanical parts are poorly lubricated, the vacuum arc extinguishing chamber drops, etc., after a power outage, methods such as tightening, lubricant reinforcement, and pressure resistance can be used to check and eliminate the above faults.
Maintenance and repair
a. After unpacking, all insulating parts should be inspected. For components that are indeed damp, they should be removed and placed in an oven at 70~80°C for 48 hours, then taken out and reinstalled for debugging.
b. During the storage of the product, if moisture or corrosion is found, it should be dealt with immediately, and protective measures should be taken after cleaning.
c. The operating ring main unit should undergo regular maintenance and inspection:
(1) Vacuum degree of the vacuum arc extinguishing chamber
(2) Contact wear
(3) Whether mechanical fasteners are loose
(4) Mechanical parameters such as opening distance and overtravel
(5) Whether the operation and rotation are flexible
(6) Whether the interlocking is reliable
(7) Whether all parts, especially insulation parts, are clean
d. If the following conditions occur, the ring main unit should be comprehensively inspected and debugged,
(1) Annual row inspection and cleaning work (2) Load switch is stored
after every 2,000 operations The ring main unit should be stored in a dry and ventilated warehouse with a temperature of -30℃~+40℃ .
1. Product certificate 2. Installation and operation instructions 3. Packing list 4. List of random accessories 5. Secondary wiring diagram
combined electrical cabinet (Figure 1)
Ordering instructions
When ordering, the following information must be provided:
a. Primary system arrangement diagram;
b. Secondary schematic diagram
; c. Model and scheme diagram of the ring main unit;
d. Model, specification and quantity of components to be installed in the cabinet;
e. Cabinet color and other requirements .
Load switch cabinet (Figure 2)
Ring network cabinet installation (Figure 3)
