Overview

HXGN □ -12 series AC metal ring network switchgear adopts FLN □ -12 type SF6 load switch as the main switch and the whole cabinet adopts air-insulated, suitable for distribution automation, compact and expandable metal enclosed ring network switchgear . It has the characteristics of simple structure, flexible operation, reliable interlocking and easy installation. Satisfactory technical solutions can be provided for various applications and different user requirements.

The main switch of HXGN □ -12 series AC metal ring network switchgear is selected from our company’s FLN36-12 type or ABB’s SFG type SF6 load switch. It can also be equipped with VS1 type, VD4/S type ISM type vacuum circuit breaker or HD4/S5 type SF6 circuit breaker. The load switch and circuit breaker can be operated manually or electrically. After matching the electric operating mechanism, PT, CT, FTU and communication device, the distribution automation function can be realized.

Model meaning

SF6 load switch

Unit switch cabinet

Normal operating conditions

1. altitude: no more than 1000 m;
2. ambient temperature :+40 C; minimum temperature :-35°C;.
3. environmental humidity: daily average not exceeding 95 per cent; monthly average not exceeding 90 per cent;
4. seismic capacity: class 8;
5. there is no explosive and corrosive gas in the surrounding air and no violent vibration shock in the installation site.

Reference criteria

Main technical parameters of vacuum circuit breaker

Structure and basic components of circuit breaker cabinet

Basic structure

HXGN port -12 circuit breaker cabinet is mainly used for the incoming line cabinet of the main power supply or backup power supply in the ring network power supply system and the middle section cabinet of the dual power supply system. The circuit breaker can choose VS1 type, VD4/S type, ISM vacuum circuit breaker or HD4/S type SF6 circuit breaker, the shape size is slightly different. From top to bottom, the circuit breaker cabinet is followed by instrument room, bus room, load (isolation) switch room, circuit breaker room and cable room, which can be equipped with CT 、PT 、 arrester, grounding switch and relay protection device according to the needs of users, and has reliable “five prevention” interlocking function.

VS1 operation mechanism of vacuum circuit breaker is spring energy storage type, which can be operated by AC or DC, or by manual operation, which is the domestic vacuum circuit breaker with the largest domestic consumption at present. Its main electrical circuit and operating mechanism overall design, stable quality, reliable performance. dominant electrical circuit composite insulation with small volume. can be installed by hand car type or fixed type. Rated current specification A 630, rated short-circuit breaking current up to 25 kA.

VD4/S type vacuum circuit breaker, or HD4/S type S F 6 circuit breaker, is specially designed by the Italian ABB company for the ring network switchgear, and its switching capacity is sufficient to cope with various states, including the operation of normal switching equipment or branch network and the switching off of short circuit current under special circumstances. Both circuit breakers A 、B 、C three-phase longitudinal arrangement, easy to install, small size and light weight. rated short circuit breaking current 25 kA.

The vacuum circuit breaker of German ISM permanent magnet mechanism is designed for assembling 10 kV ring net cabinet, and has the latest technical level of high voltage switch in the 21st century. Its permanent magnet operating mechanism is an electronic control, with on-line detection elements, permanent magnet to maintain the electromagnetic.

Basic components

(A) Upper element, including:

* Three-station SF6 load switch   * operating mechanism with mechanical position indicator   * interlocking device    * integrated low-voltage chamber   * relay protection device   * bus chamber housing   * Busbar

(B) Central module, including

* Circuit breakers   * Type VS1 or VD4/S、TypeISM vacuum circuit breakers or Type HD4/S circuit breakers

(C) Lower element, including

* Ground busbar   * Cable chamber housing   * Cable chamber floor for distribution cable support

Optional components

* Plug-in interface for integrated live or portable live displays   * Auxiliary contacts at all locations :2 NO+2 NC    * SF6 gas pressure monitor with alarm contacts (SF6 load switch)   * Current transformer    * Voltage transformer   * Lightning arrester   * Electric operating mechanism (SF6 load switch)   * grounding switch    * Short-circuit grounding fault indicator    * Cold-shrink indoor cable terminal

Other cabinets

Busbar connection cabinet
The busbar connection cabinet is used to connect the cable and the busbar. The cabinet is equipped with a cable clamp for fixing the cable. It can also be equipped with components such as current transformer and lightning arrester. Cabinet width is 375mm or 500mm.

Bus section cabinet
The busbar section cabinet is always used together with the busbar lift cabinet. The basic cabinet is 375mm wide and is equipped with a FLN36-12 or FLN48-12 or SFG type three-station SF6 load switch for busbar section.

Busbar lifting cabinet
The busbar lifting cabinet connects the busbar to the bottom of the section cabinet equipped with a load switch. It can be used as a measuring cabinet when the cabinet width is 500mm.

Metering cabinet
The metering cabinet is used to measure the voltage, current and power. The front upper door and lower door are equipped with special lead seals, which is convenient for the power supply department to seal.

Double power inlet cabinet
This equipment is composed of two electric load switch counters and a full set of automatic switching devices. In order to realize the automatic switching function of the system, in addition to the traditional PT collection voltage, the system also introduces live Monitor verification mode, and according to the actual situation, the device can be set to the following two working modes:
* The incoming line is one main and one backup
* The two incoming lines are reserved for each other

Auxiliary equipment

DJD-1 short-circuit ground fault indicator uses logic circuit to realize over-current alarm and delay reset function, and can also be reset manually Three short-circuit fault sensors are installed on the three-phase power cable, one ground fault sensor is installed on the three-core cable, the display unit is fixed on the panel of the switch cabinet, and the sensor and the display unit are connected by optical fiber or cable. The short circuit and ground fault indicator helps line patrol personnel to quickly determine the fault section, eliminate the fault in time, and shorten the fault power outage time.

Condensation controller
The condensation controller is composed of temperature (humidity) sensor, control unit and heater. When the ambient temperature (humidity) reaches the preset range, the control unit will start the heating circuit. It monitors the temperature and humidity of the installation environment of the switchgear in real time, so that the ambient temperature index meets the working requirements and can effectively prevent condensation. Typical technical parameters of the condensation controller are as follows:
Condensation start control: 8 5%RH±5%RH (20℃) Condensation stop: 75%RH±5%RH Response speed: typical value <35
Output: 1 times the working voltage, rated power resistive load AC220V3A heater rated power: 75-100W

FTU and communication device
HXGN □-12 series AC metal ring network switch equipment can be optionally equipped with DAT-1L and other types of distribution automation terminals (feeder automation terminal unit, FTU), and the switch cabinet is incorporated into the data collection and monitoring of the distribution automation system through the optical fiber communication system The system (SCADA system) realizes the remote control, telemetry and telesignal functions of the switchgear. With the master station software, it can also realize fault isolation, recovery and network reconstruction functions of the distribution network.

DAT-1L Distribution Automation Terminal

A typical DAT-1L distribution automation terminal has the following main functions:

Information collection and processing functions: including 48 road remote communication ,8 way telemetry ,8 way remote control and 1 way DC.

Parameter setting function: with parameter remote setting and local setting function.

Timing function: receive the command of the master or sub-station, keep synchronization with the system clock.

Equipment self-diagnosis, self-recovery function: regular internal important chip detection, error to the sub-station or the main station to inform and respond to the internal working conditions; with power on and software self-recovery function; with watchdog to monitor the running state of the program.

Fault detection function: can quickly detect the fault and actively report the fault information and nature to the main station or sub-station for fault isolation. including zero sequence overcurrent overvoltage detection, line overload detection and line three-phase overcurrent detection.