High-Volt Ac SF6 Dead Tank Circuit Breaker
The following is an introduction to the High-volt ac SF6 dead tank circuit breaker, hoping to help you better understand it. Welcome new and old customers to continue working with us and create a better future together!
High-volt ac SF6 dead tank circuit breaker integrates the circuit breaker and current transformer together, and the isolation chamber is horizontally installed in the grounded aluminum alloy shell. It is equipped with a CT26 spring operating mechanism. It uses fewer parts, has a simple and compact layout, is sturdy and durable as a whole, meets the requirements of oil-free switch, has excellent mechanical properties and high reliability. All important parts are processed by CNC and machining center equipment, and the bearings are imported international brand bearings (such as IKO, INA, SKF, etc.), with a mechanical life of up to 10,000 times. It is suitable for three-phase AC 50Hz outdoor high-voltage switchgear, and can be used for the control and protection of 72.5 (126) kV power transmission and transformation systems; it can also be used for contact circuit breaker and opening and closing capacitor banks.
Product Structure
High-volt ac SF6 dead tank circuit breaker adopts a three-phase porcelain column single-break structure, and three phases are equipped with a spring operating mechanism, which is centrally arranged and three-phase driven, so the appearance is novel and exquisite. The circuit breaker uses SF6 gas as the insulation and arc extinguishing medium. During operation, the three-pole SF6 gas of the circuit breaker is connected, and the pressure and density progress are monitored by a pointer-type density relay. Since the self-energy arc extinguishing principle is adopted and the circuit breaker movement system is optimized, the mechanical efficiency is effectively improved.
Product Features
1. Excellent breaking performance and long electrical life;
2. The mounting frame and support are made of high-quality steel plates that are bent as a whole. The surface treatment is all hot-dip galvanizing. All exposed fasteners are made of high-strength materials and hot-dip galvanized, or stainless steel standard parts are used. The mechanism box shell is made of stainless steel, so the product has excellent corrosion resistance;
3. High mechanical reliability and can be operated frequently;
4. Due to the inherent high insulation strength of sulfur hexafluoride gas and the optimal contact movement of the circuit breaker, the circuit breaker breaks the capacitive current without reignition;
5. The external insulation level is high, the external insulation is designed with a large creepage distance, the creepage ratio distance is &31mm/kV, and the pollution resistance is excellent. It can also operate safely in harsh environments;
6. Strong current-carrying capacity: The temperature rise test is carried out at 1.2 times the rated current of 3150A, that is, 3780A, and there is still a large margin for temperature rise at each point;
7. The overall appearance and structure of the product are compact, and on-site installation and debugging are convenient, with low maintenance workload.
Technical parameters
Mechanical adjustments forHigh-volt ac SF6 dead tank circuit breaker products are shown in the table below.
|
NO. |
Name |
Unit |
Parameter |
|
|
1 |
Center distance between circuit breaker poles |
mm |
1750 |
|
|
2 |
Moving contact stroke |
mm |
120 |
|
|
3 |
Moving contact contact stroke |
mm |
251 |
|
|
4 |
Current circuit breaker phase-to-phase operating link stroke (chord length) |
mm |
1102 |
|
|
5 |
Opening speed |
m/s |
4.2-5m/s |
|
|
6 |
Closing speed |
m/s |
2.2-3m/s |
|
|
7 |
Opening time |
ms |
w40 |
|
|
8 |
Closing time |
ms |
W100 |
|
|
9 |
Opening time |
ms |
w60 |
|
|
10 |
Closing-opening time |
ms |
w80 |
|
|
11 |
Closing-closing time |
ms |
300 |
|
|
12 |
Three-phase opening asynchronism |
ms |
w2 |
|
|
13 |
Three-phase closing asynchronism |
ms |
w3 |
|
|
Main technical parameters of the mechanism |
||||
|
NO. |
Name |
Unit |
Parameter |
|
|
1 |
Auxiliary circuit voltage |
V |
DC220DC110 |
|
|
2 |
Opening and closing coil voltage/current |
V/A |
DC110/4;DC220/2 |
|
|
|
Rated voltage |
V |
DC220、AC220/DC110、AC110 |
|
|
3 |
Energy storage motor normal working voltage range |
V |
85%~110% |
|
|
|
Power |
W |
600 |
|
|
4 |
Energy storage time of the motor |
s |
w15 |
|
|
5 |
Heater and lighting circuit voltage |
V |
AC220V |
|
|
6 |
Auxiliary switch rated voltage |
V |
DC220V. AC220V |
|
|
7 |
Auxiliary switch rated current |
A |
10 |
|
|
8 |
Number of auxiliary switch contacts |
|
10 normally open + 10 normally closed |
|
High-volt ac SF6 dead tank circuit breaker Main technical parameters
|
NO. |
Name |
Unit |
Parameter |
|
1 |
Rated voltage |
kV |
126 |
|
2 |
To ground |
|
K-230 |
|
Rated power frequency withstand voltage (1min) Between breakers |
kV |
K-265 |
|
|
|
To ground |
|
K • 550 |
|
3 |
Rated electrical impulse withstand voltage Between breakers |
|
K • 630 |
|
4 |
Power frequency withstand voltage of SF6 gas at zero gauge pressure (5min) |
|
K • 95 |
|
5 |
Rated frequency |
Hz |
50 |
|
6 |
Rated current |
A |
3150 |
|
7 |
First opening coefficient |
|
1.5 |
|
8 |
Rated short-circuit breaking current |
|
40 |
|
9 |
Rated short-circuit closing current (peak value) |
|
100 |
|
10 |
Rated short-circuit withstand current |
kA |
40 |
|
11 |
Rated peak withstand current |
|
100 |
|
12 |
Rated short-circuit duration |
s |
4 |
|
13 |
Rated out-of-step breaking current |
kA |
10 |
|
14 |
Near-zone fault breaking current |
kA |
90%lk,75%lk |
|
15 |
Rated line charging breaking current |
A |
31.5 |
|
16 |
Rated operation sequence |
M Q |
O-0.3s-CO-180s-CO |
|
17 |
Main circuit resistance |
M Q |
O-0.3s-CO180s-CO |
|
18 |
Rated sulfur hexaoxide gas pressure (20°C gauge pressure) |
Mpa |
0.5 |
|
19 |
Alarm/minimum functional pressure (20 bar gauge pressure) |
Mpa |
0.45 ±0.03 |
|
20 |
Sf6 gas annual leakage rate |
|
<0.5% |
|
21 |
Gas moisture content (V/V) |
|
^150x10-6 |
|
22 |
Mechanical life |
Times |
10000 |
|
23 |
Radio interference level |
mV |
W500 |
|
|
Blood. Between fractures |
|
3906/3150 |
|
24 |
Creep distance |
|
|
|
|
To ground |
|
3906/3150 |
|
25 |
Weight of each SF6 gas filled |
kg |
15 |
|
26 |
Weight of each circuit breaker |
kg |
2200 |
Note: External insulation is corrected according to the altitude correction factor K: 2000m above sea level, K = 1.13; 3000m above sea level, K = 1.28
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No. 196-16, Wei 12th Road, Leqing Economic Development Zone, Leqing County, Wenzhou City, Zhejiang Province, China
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