Medium-Voltage Distribution Transformers
Datasheet constraints: every range, checkbox and listbox field now states its direction
Showing changes from Rev 2
to Rev 3
in Medium-Voltage Distribution Transformers.
---
title: Medium-Voltage Distribution Transformers
…109 unchanged lines
- "Certified losses and efficiency with 10 CFR Part 431 compliance certification"
- "Design impedance at the rated tap"
+constraint: all_of
```
…23 unchanged lines
- "Internal fuse arrangement, ratings, and time-current curves"
- "Primary switch arrangement and ratings"
+constraint: all_of
```
…17 unchanged lines
- "Pad drawing with cable opening, conduit window, and ground points"
- "Enclosure integrity certification"
+constraint: all_of
```
…21 unchanged lines
- "Field testing firm qualification and test procedure"
- "Seismic anchorage calculation and detail"
+constraint: all_of
```
…30 unchanged lines
- "As-built tap position and winding connection"
- "Warranty documentation"
+constraint: all_of
```
…5 unchanged lines
```datasheet
−label: Minimum Manufacturer Production Experience
+label: Manufacturer Production Experience
type: range
unit: years
…3 unchanged lines
setpoints: [0, 3, 5, 10, 20]
default: 5
+constraint: min
```
…55 unchanged lines
setpoints: [30, 40, 45, 50]
default: 40
+constraint: min
```
…92 unchanged lines
setpoints: [45, 75, 112.5, 150, 225, 300, 500, 750, 1000, 1500, 2000, 2500, 3000, 3750, 5000, 7500, 10000]
default: deferred
+constraint: exact
```
…53 unchanged lines
setpoints: [2.4, 4.16, 4.8, 6.9, 7.2, 12, 12.47, 13.2, 13.8, 14.4, 20.8, 22.9, 23, 24.9, 34.5]
default: deferred
+constraint: exact
```
…67 unchanged lines
setpoints: [30, 45, 60, 75, 95, 110, 125, 150, 200]
default: derived
+constraint: min
```
…10 unchanged lines
setpoints: [10, 20, 30, 45, 60, 75]
default: derived
+constraint: min
```
…50 unchanged lines
max: 10
setpoints: [2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 5.75, 6, 6.5, 7, 7.5, 8, 8.5, 9, 10]
+constraint: exact
```
…21 unchanged lines
setpoints: [0, 3, 5, 8, 10]
default: 0
+constraint: min
```
…54 unchanged lines
setpoints: [55, 65]
default: 65
+constraint: max
```
…14 unchanged lines
max: 220
setpoints: [130, 155, 180, 200, 220]
+constraint: min
```
…8 unchanged lines
max: 150
setpoints: [80, 115, 150]
+constraint: max
```
…288 unchanged lines
setpoints: [3, 6, 9, 10, 12, 15, 18, 21, 24, 27, 30, 36]
default: derived
+constraint: exact
```
…33 unchanged lines
- "Current transformer provisions on the low-voltage bushings for metering"
- "Utility metering compartment"
+constraint: all_of
```
…22 unchanged lines
- "Current transformer provisions on the secondary terminals for metering"
- "Surge arresters mounted inside the enclosure"
+constraint: all_of
```
…31 unchanged lines
- "Zero-sequence impedance measurement"
- "Dissolved-gas analysis of the liquid after the temperature rise test"
+constraint: all_of
```
…44 unchanged lines
- "Verification of the tank or enclosure ground and the neutral bonding"
- "Operational test of every alarm, trip, and fan-start contact"
+constraint: all_of
```
…23 unchanged lines
- "Water content to ASTM D1533"
- "Baseline dissolved-gas analysis to ASTM D3612"
+constraint: all_of
```
…18 unchanged lines
- "Verification of ventilation clearances and screen integrity"
- "Verification of the winding temperature sensor on each phase and its alarm and trip set points"
+constraint: all_of
```
…150 unchanged lines
- "Arc-flash warning label per NFPA 70E"
- "Tap position as set at energization"
+constraint: all_of
```
…43 unchanged lines
setpoints: [1, 2, 3, 5, 10]
default: 1
+constraint: min
```
…22 unchanged lines
- "One cooling fan for each unit furnished with a forced-air stage"
- "Touch-up finish in the exterior color"
+constraint: all_of
```
## A blown internal fuse is otherwise an outage that lasts until a replacement is sourced, and a fuse of a different rating installed to end the outage defeats the coordination study, so a fused unit without spare elements on the site is a fused unit waiting for a substitution. {note}
## Spare parts shall be of the same manufacturer and rating as the installed items, shall be delivered in their original packaging, and shall be labeled with the equipment designation of the unit they serve.