Multiple Step Enclosed Capacitor Bank

Ordering Information

Gilbert Electrical System metal enclosed capacitor assemblies are designed to meet a wide variety of multiple step capacitor applications for utility and industrial customers.

Standard assemblies are available as low as 300 KVAR per stage and as large as 7200 KVAR per stage for 5 to 15 kV applications (25kV and 35kV assemblies are available as well as higher KVAR ratings):

Multiple Step Capacitor Assemblies (type MSC) offers a well-engineered and efficient way to provide a wide variety of KVAR and options.

Gilbert Electrical Systems multiple step metal enclosed capacitor assemblies can offer cost savings over open-type capacitor and competitive assemblies in several ways

•More KVAR can be furnished in a smaller area saving in "real-estate" costs.
•The assemblies come pre-assembled and installation site assembly is minimal allowing a substantial savings in labor and equipment costs.
•The enclosure is tamper resistant and meets ANSI standard C57.12.28 enclosure integrity requirement providing safety for operating personnel, also reduces operating costs by protecting the equipment from wildlife and mischievous vandalism.
•The tamper resistant feature allows the assembly to be placed in a non-fenced area saving cost and reduces space limitations.
•The enclosure is durable 11-gage welded sheet steel with positive three point latched doors.
•Enclosure is painted with DuPont Powder Coat paint
•Application versatility with the addition of many options and controls within the assembly.
•Assemblies can be placed indoor as well as outdoor locations.

GES-MSC Basic Options will be, but not limited to, the following

•Bank connections: Grounded WYE, ungrounded WYE or delta.
•Single-phase capacitors through 8.32kV for three-phase systems 14.4kV are available.
•Vacuum or oil switches (vacuum contactors for 5kV applications).
•Incoming cable arrangements for bottom or top entry.
•Control power transformer.
•Current limiting reactors (manufactured by Gilbert).
•Surge arresters.
•Ground switches.
•Unbalance detection.
•Key interlocks.
•Pentahead-bolted doors.
•Standard paint Guardian green finish-paint Munsell 7.0GY3.29/1.5. ANSI gray 61 or 70 are also available. Other colors can be furnished. Painted with DuPont Powder Coat paint.
•Standard material is 11-gage steel welded enclosures with ship channel base (Aluminum and Stainless Steel units are available).

**Proper current limiting reactors are required (provided) in the stages to protect the equipment from back to back switching transients.

Capacitor Units

Gilbert Electrical Systems type MSC capacitor assemblies are furnished with field-proven highly reliable all-film capacitors. The capacitors are designed with low operating temperature, reduced tank rupture hazard and are properly fused.

Quoting and Ordering Information

To request a quotation or order GES type MSC capacitor assembly, use the tables below to construct a catalog number, which will describe your requirement.

Table 1 - Select the Code Describing the System Voltage From Table 1.

Table 1 - System Voltage  
Capacitor Line-to-line Voltage* Code
 2400  A
 2770  B
 4160  C
 4800  D
 7200  E
 8320  F
 12470  G
 13200  H
 13800  I
 14400  J
* Contact us for Other Voltage Ratings.

Table 3 Select the Number of Switching Steps Desired.

Table 3 Number of Steps
Specify a number from 2 through 12.

Table 4-KVAR Increment Per Step.

Table 4  KVAR Per Step
Specify the kvar increment per step.
Note: Add the appropriate step number and KVAR increments to the catalog number.

Table 5-Select the Code Describing the RequiredBank Connection.

Table 5 Connection Code  
Description Code
Ungrounded WYE
(3-phase-3wire, or 3-phase, 4-wire systems)
 U
Grounded WYE
(3-phase, 4-wire multi-grounded systems only)
 G
Delta(3-phase, 3-wire, or 3-phse, 4-wire systems)
 D

Table 7 - Select the Code Describing the Switching Options.

Table 7 Switch Options  
Description Code
Switched with 3 single-phase 200 amp Oil Switches
 S
Switched with 3 single-phase 200 amp Vacuum Switches
 V
Switched with 1 three-phase Vacuum contactor(For use on systems up to 5 kV only)  C
  Table 2 - Select the Code Describing the Total Three Phase KVAR Rating From Table 2.

Table 2 - Total Bank KVAR
Total 3-Phase
KVAR Rating
Code
Total 3-Phase KVAR Rating
Code
 300  030  3900 390 
 450  045  4050 405
 600  060  4200 420 
 750  075  4350 435 
 900  090  4500 450 
 1050  105  4650 465 
 1200  120  4800 480 
 1350  135  4950 495 
 1500  150  5100 510 
 1650  165  5250 525 
 1800  180  5400 540 
 1950  195  5500 550 
 2100  210  5700 570 
 2250  225  5850 585
 2400  240  6000 600 
 2550  255  6150 615 
 2700  270  6300 630 
 2850  285  6450 645 
 3000  300  6600 660 
 3150  315  6750 675 
 3300  330  6900 690 
 3450  345  7050 705 
 3600  360  7200 720 
 3750  375    
* Contact us for Other KVAR Ratings.

Table 6 - Select the Codes Describing the Incoming Section From Table 6.

Table 6 Incoming Section Arrangement (A)
Incoming Arrangement
(*Select One Code)
Incoming Options
(*Select One Code)
Incoming Entry
(*Select One Code)
Description Code
Description
Code
Description
Code
Bus Termination Only 0 None
0 Bottom Entry (Standard)
 0
Main 3-Pole Disconnect Switch 1 Control Power Transformer (CPT)
1 Top Entry
1
Main Fuses 2 Distribution Surge Arrester
2 Top Entry via Roof Bushings
2
Main 3-Pole Disconnect Switch & Main Fuses 3 Control Power Transformer (CPT) and Distribution Surge Arresters
3  

Table 8 - Select the Code Describes the Optional Equipment Available as a Standard
Table 8 - Optional Equipment  
Description: Code
Key Interlock Scheme K
Penta-Head Bolt Doors P
Unbalance Detection C

Unbalance scheme for each step: Placing a detection scheme on each individual step will trip the affected step only and allow the remaining steps to function without hindrance. The affected step will be locked out until maintenance is performed and the step is reset.

1

A main unbalance detection scheme: This method monitors the main capacitor bus feeding all the steps. All steps will drop and lock out if any step has an unbalance. The relay will have to be set for the smallest capacitor in a step.

2
  Ground Switch

Ground switch for each step: Placing a ground switch on each individual step will allow the affected step to be grounded, capacitors to discharge and be separated from the rest of the capacitor assembly. This will allow the remaining steps to function without hindrance.

3

A main ground switch scheme: This method requires more circuitry and less ground switches. All steps will have the capacitor step switch opened. The main disconnect switch will have to be opened separating the bank from the incoming line. Then the capacitor switches will have to be reclosed to allow the all capacitors to discharge.

4

Controller (*Select One)


Allen-Bradley PLC

A

Voltage

E

Current

C

Power Factor

P

Var

R

Multifunctional

L

Manual

M

None (Supplied by others)

N

  Paint (*Select One)


Guardian Green, Munsell No. 7.0GY3.2/1.5 (standard).

5

Gray ANSI 61

6

Light Gray ANSI 70

7

  Enclosure (*Select One)


Standard 11 ga Steel

S

Aluminum

U

Stainless Steel

T


Contructing a Catalog Number

Unbalance scheme for each step: Placing a detection scheme on each individual step will trip the affected step only and allow the remaining steps to function without hindrance. The affected step will be locked out until maintenance is performed and the step is reset.
Unbalance scheme for each step: Placing a detection scheme on each individual step will trip the affected step only and allow the remaining steps to function without hindrance. The affected step will be locked out until maintenance is performed and the step is reset.
 Constructing a Catalog Number

The chart below shows how to construct the catalog number for the series MSC metal-enclosed capacitor assembly with the following requirements:

•7200/12470 volt 3150-KVAR three–phase.
•Three stages to develop seven steps of 450 KVAR increments (3150 KVAR total).
•Three phase, four wire system – Grounded-WYE connected bank.
•Switched with 200 amp vacuum switches.
•Main disconnect switch.
•Bottom entry.
•Control Power Transformer (Connected phase to neutral).
•Lightning Arrestors.
•Key-interlock scheme.
•Ground switch for each step.
•Allen Bradley Controller.
•ANSI 61 gray.
•Standard enclosure.

MSC - Basic letters for series MSC metal enclosed Multiple Step Capacitor assembly
- Total installed three-phase KVAR from Table 1
315 - Voltage rating code Table 2
- Number of steps from Table 3.
450 - KVAR increment from Table 4.
– Bank connection code; select from Table 5
130 - Incoming section option code; select from Table 6
- Switch code; select from Table 7
KABGR - Optional equipment codes: select from Table 8

The complete catalog number would be: MSC-G-315-7-450-G-130-V-KABGR

gilbert electrical systems, metal enclosed capacitor banks, mulitple step enclosed capacitor bank, melp, beaver, west virginia

gilbert electrical systems, metal enclosed capacitor banks, mulitple step enclosed capacitor bank, melp, beaver, west virginia

Example: If 3150 kvar is required that is switched in seven steps, one 450 KVAR stage and three 900 KVAR stage will be provided with a binary switching logic controller that is interfaced with the type of control strategy required (e.g., voltage, VAR, power factor, etc...). Sequence switching will be provided, in this example, as follows:

Step # Stage 1 = 450 KVAR
Stage 2 = 900 KVAR
Stage 3 = 1800 KVAR
Total KVAR
 1  on - - 450
 2  - on - 900
 3  on on - 1350
 4  - - on 1800
 5  on - on 2250
 6  - on on 2700
 7  on on on 3150

This type of scheme reduces the number of required capacitors, capacitor fuses, switches, and current limiting reactors that in turn reduces the amount of enclosure (space) required for installation.

Multiple Step Enclosed Capacitor Bank | Ordering Information | Request a Quote

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