Medium-voltage metal-clad switchgear
Type GM38 (38 kV)
- Description
- Circuit breaker ratings
- Dimensions in inches
Type GM38 metal-clad air-insulated switchgear can meet almost any switchgear application from 23 kV through 38 kV. The horizontal drawout vacuum circuit breakers occupy the lower cell with voltage transformers (VTs) or drawout fuses available in the upper cell. The lower cell may be used for auxiliaries, such as VTs, a control power transformer (CPT) or drawout fuses. Two types of outdoor housing are offered: non-walk-in and shelter-clad.
- One-high construction
- Uses the latest developments in vacuum interrupter technology
- Highly reliable vacuum interrupters-estimated MTTF over 42,000 years
- Designed for up to 50 full-fault interruptions
- Three-cycle interrupting time (optional)
- Meets or exceeds the latest ANSI, IEEE and NEMA standards
- UL Listing available for 40 kA rating
- Universal spare circuit breaker
- Interlocks permit insertion of high rating vacuum circuit breaker into lower rated cell but not vice versa
- Front accessible circuit breaker operating mechanism for ease of maintenance
- Closed door racking
- Floor rollout circuit breaker without a dolly
- Visible secondary disconnect
- Pair with Siemens protective relays to match any typical application
Type 38-3AH3
| Measured parameter | Units | Circuit breaker type 38-3AH3-1500 [1] | Circuit breaker type 38-3AH3-31 [2] | Circuit breaker type 38-3AH3-40 [2] | ||
| General | Nominal voltage class | kV | 38.0 | 38.0 | 38.0 | |
| General | Nominal three-phase MVA class | MVA | 1,500 | ---- | ---- | |
| Rated values | Rated voltage | Maximum design voltage (V) | kV rms | 38.0 | 38.0 | 38.0 |
| Rated values | Rated voltage | Voltage range factor (K) | ---- | 1.65 | 1.0 | 1.0 |
| Rated values | Insulation levels | Withstand voltage levels power frequency | kV rms | 80 | 80 | 80 |
| Rated values | Insulation levels | Withstand voltage levels lightning impulse (BIL) | kV peak | 150 | 150 | 150 |
| Rated values | Rated current | Continuous | A rms | 1,200, 2,000, 3,000FC [3] | 1,200, 2,000, 3,000FC [3] | 1,200, 2,000, 3,000FC [3] |
| Rated values | Rated current | Short-circuit (at rated maximum design voltage) (I) | kA rms sym | 21 | 31.5 | 40 |
| Rated values | Rated current | Interrupting time | Cycles / ms | 5 / 83 [8] | 5 / 83 [8] | 5 / 83 [8] |
| Rated values | Rated current | Permissible tripping delay (Y) | Sec | 2 | 2 | 2 |
| Related required capabilities | Current | Rated maximum design voltage (V) divided by K = (V/K) | kA rms | 23.0 | 38.0 | 38.0 |
| Related required capabilities | Current | Maximum symmetrical (sym)interrupting (K X I) | kA rms sym | 35 | 31.5 | 31.5 |
| Related required capabilities | Current | Short-time current (K x I) (three seconds) | kA rms sym | 35 | 31.5 | 40 |
| Related required capabilities | Closing and latching(momentary) | Asymmetrical | kA rms | 56 [4] | 50 [6] | 62 [6] |
| Related required capabilities | Closing and latching(momentary) | Peak | kA peak | 95 [5] | 85 [7] | 104 [7] |
Footnotes:
[1] Historic constant MVA class (ANSI C37.07-1987)
[2] New constant kA class (ANSI C37.06-2000)
[3] Fan-cooled
[4] 1.6 x K x I
[5] 2.7 x K x I
[6] 1.55 x I
[7] 2.60 x I
[8] Three-cycle (50 ms) interrupting optional.
| Type | Weight lbs. (kg) | Width (W) | Height (H) | Depth (D) | Drawout aisle (DA) |
| Indoor | 5,000 (2,273) | 48.0 (1,219) | 110.0 (2,794) | 130.0 (3,302) | 96.0 (2,438) recommended |
| Outdoor shelter-clad single-aisle | 6,400 (2,909) | 48.0 (1,219) | 132.5 (3,366) | 234.5 (5,956) | 96.0 (2,438) included |
| Outdoor non-walk-in | 5,800 (2,636) | 48.0 (1,219) | 132.5 (3,366) | 139.4 (3,539) | 96.0 (2,438) recommended |
Type 38-3AH3 circuit breaker weight lbs. (kg)
| Continuous current | 38-3AH3-1500 | 38-3AH3-31.5 | 38-3AH3-40 |
| 1,200 A | 800 (363) | 800 (363) | 825 (375) |
| 2,000 A | 900 (408) | 900 (408) | 925 (420) |
| 3,000 A | 1,000 (454) | 1,000 (454) | 1,025 (465) |
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