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High Voltage AC Isolating Switch GTD9-12D | China Suppliers & Factory Solutions for Reliable Performance
Detail introduction
This product is suitable for three-phase AC 50/60HZ, 12KV no-load current situations. When isolation, maintenance or repair of the circuit is required, the circuit can be disconnected or closed to achieve safe isolation and ensure the safety of operators and equipment. The layout, appearance, and dimensions of this isolating switch are completely consistent with VTD9-12D and FTD9-12D vacuum switches. It is a typical through wall isolating switch that is easy to expand and combine in switchgear.
IEC62271-1High voltage switchgear and control equipment - Part 1: Common technical requirements for AC switchgear and control equipment
IEC62271-102High voltage switchgear and control equipment - Part 102: AC isolating switches and grounding switches
GB/T1985High voltage AC isolating switch and grounding switch
GB/T11022Common Technical Requirements for High Voltage Switchgear and Control Equipment Standards
DL/T486High voltage AC isolating switch and grounding switch
Service Conditions
- Environmental temperature: - 25℃ ~ +40℃;
- Altitude: ≤ 1000m;
-
Relative humidity:
Daily average relative humidity ≤ 95%
Monthly average relative humidity ≤ 90%
Daily average vapor pressure ≤ 2.2x10-3 MPa
Monthly average vapor pressure ≤1.8x10-3MPa; - Seismic grade: seismic intensity ≤ 8;
- Applicable location: free from dripping water, flammable and explosive hazards, chemical corrosive gases, and severe vibrations.
Note: When the usage environment deviates from normal usage conditions, please consult with our company to determine.
Technical Data
| Item | Unit | Parameter | |
| Rated frequency | Hz | 50/60 | |
| Rated voltage | kV | 12 | |
| Rated power frequency withstand voltage (1 minute, r.m.s) | Phase to phase and phase to ground | KV | 42 |
| Isolation fracture | 48 | ||
| Control and auxiliary circuits | 2 | ||
| Rated lightning impulse withstand voltage (peak) | Phase to phase and phase to ground | kV | 75 |
| Isolation fracture | 85 | ||
| Rated current | A | 630, 1250 | |
| Rated short-circuit breaking current (r.m.s) | kA | / | |
| Rated short-time withstand current and time | kA/s | 20/4, 25/4, 31.5/4 | |
| Rated peak withstand current | kA | 50, 63, 80 | |
| Rated short-circuit making current (peak) | kA | / | |
| Rated breaking current of single/back-to-back capacitor group | A | / | |
| Rated capacitor bank making current | kA | / | |
| Rated handover (transfer) current | A | / | |
| Mechanical life | Times | 3000 | |
| Main circuit resistance of each phase | mΩ | ≤ 45, ≤ 40 | |
| Clearance between open contacts | mm | 125 ± 1 | |
| Contacting travel | mm | / | |
| Contact closing bounce time | mm | / | |
| Three-phase asynchronous closing and opening | ms | / | |
| Average opening speed (contact just opened - 6mm) | m/s | / | |
| Average closing speed ( 6mm - contact just opened) | m/s | / | |
| Rated contact pressure | N | / | |
| Opening time (at rated voltage) | ms | / | |
| Closing time (at rated voltage) | ms | / | |
| Rated operating sequence | / | ||
Typical outline dimensions (fit) and structural diagram
| Rated current (A) | 630 | 1250 |
| Rated short-time withstand current (kA, 4s) | 25 | |
| Inter-phase distance (mm) | 210 | |
GTD9-12 (inter-phase distance P=210) outline dimension drawing of isolating switch
(This diagram shows the product in the upright position, and the product can also be installed in an inverted position.)
| Rated current (A) | 630 | 1250 |
| Rated short-time withstand current (kA, 4s) | 25 | |
| Inter phase distance (mm) | 210 | |
GTD9-12D (inter-phase distance P=210) outline dimension drawing of isolating switch
(This diagram shows the product in the upright position, and the product can also be installed in an inverted position.)
Frequently Asked Questions (FAQ)
Q1: What is the primary application of this isolating switch?
This isolating switch is designed for three-phase AC 50/60Hz, 12KV no-load current situations. It provides safe electrical isolation during circuit maintenance or repairs to protect operators and equipment.
Q2: Which international and national standards does the switch comply with?
The product fully complies with international standards IEC62271-1 and IEC62271-102, as well as Chinese national standards GB/T1985, GB/T11022, and DL/T486.
Q3: Can this isolating switch be mounted in different orientations?
Yes, while the outline dimension drawings show the product in an upright position, it is designed for installation in both upright and inverted positions based on your switchgear layout needs.
Q4: What are the standard environmental requirements for operation?
Standard operating conditions require an ambient temperature between -25℃ and +40℃, an altitude of 1000m or less, daily relative humidity under 95%, and a seismic intensity grade of 8 or less in a location free of corrosive gases and severe vibration.
Q5: What are the rated current options available for this switch?
This isolating switch is available in two rated current options: 630A and 1250A, with a rated short-time withstand current of 25kA for 4 seconds.
Q6: What should be done if the operating environment exceeds the standard service conditions?
If your installation environment deviates from the specified service conditions (such as higher altitudes or extreme temperatures), please consult our technical support team directly to determine compatibility and customized solutions.