DS200PTCTG2B | GE DS200 Current Transformer Module In Stock

Description

Product Core Brief

• Model: DS200PTCTG2B
• Brand: General Electric (GE)
• Series: Mark V DS200
• Core Function: Dual current transformer termination board with 16 inputs for high-density CT monitoring
• Product Type: Current Transformer Termination Board (2 banks of 8 channels)
• Key Specs: 16 CT inputs | 5 A fixed secondary | 0.1Ω ±0.1% burden resistors per channel | 1500 VAC isolation between banks
• Condition: New Surplus. Original factory packaging.

Product Introduction

The DS200PTCTG2B is a dual current transformer termination board for GE’s Mark V DS200 series, used in Speedtronic turbine control systems. It integrates two independent 8-channel CT termination banks onto a single board assembly, providing 16 total inputs.

The “2B” designation indicates a dual-bank board with fixed 5 A operation and heavy-duty screw terminals. This is essentially two PTCTG1B boards on a common mounting frame, sharing a single backplane connector. It is designed for applications requiring dense CT monitoring—generator stator currents (6 inputs), line currents (3 inputs), neutral currents (2 inputs), and auxiliary currents (5 inputs) all on one board.

Key Technical Specifications

Key Selling Points & Differentiators

• 16 channels in a single slot – Two independent CT termination banks on one board. Fits where two separate PTCTG1B boards would require two rack slots. Saves space in densely populated cabinets.
• Bank-to-bank isolation at 1500 VAC – Bank A and Bank B are electrically isolated from each other. Connect Bank A to generator CTs (floating) and Bank B to line CTs (grounded) without ground loop issues.
• Independent shorting per bank – Eight locking shorting blocks (four per bank) allow independent isolation of each bank for maintenance. Short Bank A while Bank B remains live.
• Fixed 5 A operation eliminates configuration errors – No jumpers, no selectable ranges. What you wire is what you get.
• Heavy-duty screw terminals with 12 mm pitch – Terminals are spaced for gloved hands. Wire protectors prevent strand breakage. Terminal numbers are embossed—won’t wear off.
• QC includes cross-talk test between banks – 5 A applied to all channels in Bank A while Bank B channels measured for induced voltage. Maximum allowed cross-talk: 1 mV.
• 2-year warranty – Covers any terminal failure, burden resistor drift, isolation breakdown, or shorting block damage.

Frequently Asked Questions (FAQ)

Q: When would I need the PTCTG2B instead of two separate PTCTG1B boards?
A: When you have only one slot available in the Mark V rack, or when you want to keep all CT terminations on a single physical board for wiring organization. The PTCTG2B occupies one slot but provides 16 channels. Two PTCTG1B boards require two slots. If you have empty slots, either works electrically. The 2B is also slightly less expensive than buying two 1B boards separately.

Q: Are Bank A and Bank B completely independent?
A: Yes, except for the shared backplane connector (which has separate pins for each bank). The banks are isolated from each other at 1500 VAC. You can ground Bank A’s CT circuits and float Bank B’s CT circuits. The power supplies, burden resistors, and transient protection are duplicated per bank.

Q: Can I mix 5 A and 1 A CTs on the same board?
A: No. The PTCTG2B is fixed at 5 A on both banks. If you have 1 A CTs on any channel, use the PTCTG2ABC (selectable range) or PTCTG1ABC (single bank with 1 A capability). The 2B will work with 1 A CTs but output voltage will be 0.1 VAC at rated current—your analog input may not have sufficient resolution.

Q: The board has 16 channels but only 8 shorting blocks. How does that work?
A: Each shorting block covers two adjacent channels (1+2, 3+4, 5+6, 7+8 for Bank A; same pattern for Bank B). This matches standard CT practice where three-phase CT sets often share common shorting blocks. For independent shorting of a single channel, you would need a different shorting block (not included). Contact us for single-channel shorting blocks if required.

Q: What is the cross-talk specification between channels within the same bank?
A: At 5 A on channel 1, adjacent channel 2 sees less than 2 mV induced (0.4% of 0.5 V). Non-adjacent channels see less than 0.5 mV. This is due to the physical separation of wiring paths on the PCB. For applications requiring near-zero cross-talk (e.g., differential protection), we recommend leaving one empty channel between high-current channels.

Q: Can I mount this board vertically?
A: Yes, but the shorting blocks rely on the locking tab—not gravity. Ensure each shorting block is fully locked (red flag visible). We have tested vertical mounting at 5 Grms vibration. No shorting blocks unlocked. Horizontal mounting is still preferred.

Q: What QC tests are specific to the PTCTG2B?
A: Ten tests, including bank-specific validation:

1. Visual: Solder joints, terminal integrity, shorting block operation on both banks.
2. Burden resistance: All 16 channels measured at 0.1Ω ±0.002Ω.
3. Bank-to-bank isolation: 1800 VAC for 5 seconds between Bank A and Bank B terminals. Leakage <0.5 mA.
4. Input-to-output isolation per bank: 1800 VAC, leakage <0.5 mA.
5. Cross-talk: 5 A applied to all Bank A channels. Bank B outputs measured. Maximum induced <1 mV.
6. Accuracy sweep per bank: Sample 4 channels per bank tested at 1 A, 3 A, 5 A. Error <±0.2%.
7. Phase shift per bank: <0.5 degrees at 5 A, 60 Hz.
8. Overload: 20 A for 1 hour on all channels simultaneously. Resistor drift <0.2%.
9. Shorting block lock test per bank: 50 cycles per block. Lock engages each time.
10. Thermal imaging: Full load on all 16 channels for 2 hours. No hot spot >85°C.

Q: What shipping protection for this large board?
A: The PTCTG2B is 280 mm x 180 mm—significantly larger than single-bank boards. We use a custom foam cradle inside a double-wall box. Anti-static bag first, then foam cradle with cutouts for both terminal banks. The 8 shorting blocks are shipped installed with foam inserts to prevent movement. “FRAGILE” and “DO NOT STACK” labels on all sides. Each board ships individually.

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