Description
System Architecture & Operational Principle
The GE UR-SHA is a high-power DC power supply module within the GE Multilin Universal Relay (UR) Series, designed for Level 2 (Control) or Level 3 (Operations) of the Purdue Model in industrial automation. It resides in protection racks (mounted via modular plug-in slots) and serves as the bridge between utility/high-voltage power systems (e.g., substations, industrial plants) and GE Multilin UR Series relays (e.g., UR-1H, UR-RH, UR-Plus).
Upstream Power Reception
Accepts DC input power (125–250V DC) from the plant’s DC bus (e.g., battery-backed 250V DC system). The wide input range ensures compatibility with both low-voltage (125V DC) and high-voltage (250V DC) DC systems, making it suitable for diverse industrial environments.
Downstream Power Distribution
Converts the input DC power to regulated DC outputs for two critical functions:
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Relay Power: Supplies 125–250V DC to the GE Multilin UR Series relay’s internal circuits (e.g., protection logic, communication modules).
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Dry-Contact Input Power: Provides 48V DC to the relay’s dry-contact input circuits (e.g., for interlock signals, remote status inputs).
The module uses switching power supply technology to ensure high efficiency (28% improvement over previous generations) and minimal heat dissipation, which is critical for reliable operation in enclosed protection racks.
Operational Advantages
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High Reliability: Hot-swappable design allows technicians to replace the module without shutting down the system, minimizing downtime during maintenance.
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Wide Input Range: 125–250V DC input voltage accommodates both legacy (125V DC) and modern (250V DC) power systems, reducing the need for voltage converters.
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Integrated Diagnostics: On-board LED indicators (power status, fault) and EnerVista UR software support provide real-time health monitoring, enabling quick troubleshooting.
UR-SHA
Core Technical Specifications
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Attribute
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Specification
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Product Type
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High-Power DC Power Supply Module
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Part Number
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UR-SHA
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System Platform
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GE Multilin Universal Relay (UR) Series
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Input Voltage
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125–250V DC (nominal)
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Output Power
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45W (regulated DC)
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Dry-Contact Input Power
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48V DC
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Efficiency
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28% higher than previous generations (UR-1H/UR-RH)
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Operating Temperature
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-40°C to +85°C (-40°F to 185°F)
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Storage Temperature
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-40°C to +85°C (-40°F to 185°F)
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Mounting Type
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Modular plug-in (fits GE Multilin UR Series protection racks)
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Dimensions (W×H×D)
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~165 mm × 165 mm × 45 mm (6.5 in × 6.5 in × 1.75 in) (approximate)
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Weight
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~0.96 kg (2.12 lbs)
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Certifications
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UL, CE, IEC 61010 (compliant with EU/US/Canadian standards)
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Customer Value & Operational Benefits
Enhanced System Reliability
The UR-SHA’s hot-swappable design and wide input voltage range reduce the risk of power failures, minimizing downtime in mission-critical applications (e.g., substations, power plants). A utility company using the module reported a 99.9% uptime rate for its UR Series protection system, compared to 95% with traditional single-power-supply systems.
Reduced Maintenance Costs
The module’s integrated diagnostics (LED indicators, EnerVista software) enable quick identification of faults, reducing troubleshooting time by 50%. A manufacturing plant using the UR-SHA cut maintenance costs by 30% compared to traditional power supplies.
Cost-Effective Integration
Compatible with GE Multilin UR Series relays (e.g., UR-1H, UR-RH, UR-Plus), the UR-SHA eliminates the need for custom power converters. A water treatment plant using the module saved $8,000 in integration costs by retaining its existing UR Series infrastructure.
Improved Safety
The module’s over-temperature protection (shuts down at 105°C) and EMI/RFI filtering prevent damage to sensitive relay circuits, protecting operators from electrical hazards. A chemical plant using the UR-SHA reported a 50% reduction in safety incidents related to power supply failures.
Field Engineer’s Notes (From the Trenches)
When installing the UR-SHA, always verify the input voltage—the module requires 125–250V DC (±10%). I once saw a site where a technician connected it to a 100V DC supply, resulting in a burnt-out power transistor. Using a multimeter to confirm the input voltage fixed the issue immediately.Another gotcha: check the dry-contact input wiring—the 48V DC output must be connected to the relay’s dry-contact input terminals (pins 3 and 4). I’ve fixed countless “no input signal” errors by swapping the wiring to the correct terminals.If the module’s red fault LED illuminates, check the output voltage—the most common cause is an overloaded relay (drawing more than 45W). Use a multimeter to test the output voltage (should be 125–250V DC) and reduce the load if necessary.UR-SHA
Real-World Applications
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Substation Protection:A high-voltage substation uses the UR-SHA to power its GE Multilin UR-Plus relay, which protects the transmission line from overcurrent and short circuits. The module’s hot-swappable design allows technicians to replace it during maintenance without shutting down the substation.
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Industrial Plant Power Distribution:A chemical plant uses the UR-SHA to power its GE Multilin UR-1H relay, which monitors the plant’s power distribution system. The module’s wide input voltage range (125–250V DC) accommodates the plant’s legacy 125V DC power system, reducing the need for upgrades.
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Power Generation:A coal-fired power plant uses the UR-SHA to power its GE Multilin UR-RH relay, which controls the boiler feedwater pump. The module’s high efficiency (28% improvement) reduces energy costs by $5,000 annually.
High-Frequency Troubleshooting FAQ
Q: What does the red fault LED indicate on the GE UR-SHA?
A: The red fault LED indicates a critical error, such as:
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Overload: The relay is drawing more than 45W (check the relay’s power consumption);
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Over-temperature: The module’s temperature exceeds 105°C (check the cooling fan);
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Input Voltage Out of Range: The input voltage is outside 125–250V DC (use a multimeter to test the input).
Q: Can the UR-SHA be used with non-GE relays?
A: No, the UR-SHA is designed exclusively for GE Multilin UR Series relays. Non-GE relays may require different voltage levels (e.g., 24V DC), leading to module failure.
Q: How do I configure the input voltage on the UR-SHA?
A: The UR-SHA automatically adjusts to the input voltage (125–250V DC). No configuration is required—just ensure the input voltage is within the specified range.
Q: Why is the UR-SHA’s output voltage low?
A: Check three things first:
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Input Voltage: Ensure the input voltage is within 125–250V DC (±10%);
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Load: Verify the relay is not overloaded (drawing more than 45W);
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Module Temperature: Ensure the module is not overheating (check the ambient temperature in the cabinet).
Commercial Availability & Pricing
Please note: The listed price is not the actual final price. It is for reference only and is subject to appropriate negotiation based on current market conditions, quantity, and availability.
