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BE1-87G - Introduction i W A R N I N G ! To avoid personal injury or equipment damage, only qualified personnel should perform the procedures presented in this manual. INTRODUCTION This manual provides information concerning the operation and installation of the BE1-87G Variable Percentage Differential Relay.
ii BE1-87G - Introduction CONFIDENTIAL INFORMATION OF BASLER ELECTRIC COMPANY, HIGHLAND, IL. IT IS LOANED FOR CONFIDENTIAL USE, SUBJECT TO RETURN ON REQUEST, AND WITH THE MUTUAL UNDERSTANDING THAT IT WILL NOT BE USED IN ANY MANNER DETRIMENTAL TO THE INTEREST OF BASLER ELECTRIC COMPANY.
BE1-87G - Introduction iii CONTENTS SECTION 1 GENERAL INFORMATION 1-1 Description .............................................. 1 - 1 Applications ............................................. 1 - 1 Variable Restraint Characteristic .................
iv BE1-87G - Introduction CONTENTS - Continued SECTION 5 TESTING AND SETTING - Continued Sensing Input Range 1, Operating Characteristics ............ 5 - 5 Sensing Input Range 2, Operating Characteristics ............ 5 - 6 Extended Restraint Operating Characteristic .
BE1-87G - General Information 1-1 WARNING Relays manufactured prior to July 22, 1991 (EIA date code symbol 9129 and previous) do NOT have case jumpers between terminals 7 and 8 (single phase units). This also applies to three phase relays terminals 7 and 8, terminals 13 and 14, and terminals 17 and 18.
1-2 BE1-87G - General Information Figure 1-1. Typical Single-Phase Application Scheme Figure 1-2. Typical Three-Phase Application Scheme.
BE1-87G - General Information 1-3 Variable Restraint Characteristic At high current levels, the inevitable difference in the saturation characteristics between current transformers indicates a need for a compensating decrease in relay sensitivity.
1-4 BE1-87G - General Information BE1-87G Model Number G Three-phase sensing input 1 Sensing range switch selectable for 0.1, 0.15, 0.2, 0.4, 0.5, 0.8, or 1.
BE1-87G - General Information 1-5 SPECIFICATIONS BE1-87G relays are available in single-phase and three-phase configurations, and with the following fea tures and capabilities. Current Sensing Inputs (5 Ampere) Nominally rated at 5 amperes, with a range of 45 to 65 hertz.
1-6 BE1-87G - General Information Pickup Accuracy (1 Ampere) For I R 1 amp ere, ±5% of the operate pickup characteristic or 25 milliamperes whichever is greater. Actual operating characteristics are shown in graph format in Section 5, Testing And Setting the relay.
BE1-87G - General Information 1-7 Isolation In accordance with ANSI/IEEE C37.90, one minute dielectric (high potential) tests as follows: All circuits to ground: 2121 Vdc Input to output circuits: 1500 Vac or 2121 Vdc Surge Withstand Capability Qualified to ANSI/IEEE C37.
BE1-87G - Human Machine Interface (Controls And Indicators) 2-1 SECTION 2 • HUMAN MACHINE INTERFACE (Controls And Indicators) DESCRIPTION Table 2-1 lists and briefly describes the BE1-87G Variable Percentage Differential Relay operator controls and indicators.
BE1-87G - Functional Description 3-1 SECTION 3 • FUNCTIONAL DESCRIPTION GENERAL BE1-87G Variable Percentage Differential Relays are static devices that protect motors and generators by providing an output signal when incoming current does not match outgoing curre nt b y a predetermined but variable limit.
3-2 BE1-87G - Functional Description 0 5 10 15 20 25 30 35 0123456789 1 0 CURRENT ( AMP S ) VOLTAGE(VOLTS) 0 5 10 15 20 25 30 0 0.2 0.4 0.6 0. 8 1 1.2 1.4 1.6 1. 8 2 CURRENT ( AMP S ) VOLTAGE(VOLTS) and one ampere nominal), one transformer on each side of the protected machine, supply sensing current for each monitored phase.
BE1-87G - Functional Description 3-3 Figure 3-3. Sensing Input Range 2 (1 Ampere),Stabilizing Reactor Impedance Characteristics Bandpass Filters Outputs from the relay transformers are filtered to eli.
3-4 BE1-87G - Functional Description supply status output relay continually energized and its output contacts open. If the power supply output voltage falls below the requirements for proper operation, the power supply status output relay de-energizes, closing the NC output contacts.
BE1-87B - Installation 4-1 Figure 4-1. S1 Case, Outline Dimensions, Front View SECTION 4 • INSTALLATION GENERAL When not shipped as part of a control or switchgear panel, the relays are shipped in sturdy cartons to prevent damage during transit.
4-2 BE1-87B - Installation Figure 4-2. S1 Case, Double-Ended, Outline Dimensions, Semi-Flush Mounting, Side View Figure 4-3. S1 Case, Double-Ended, Outline Dimensions, Projection Mounting, Side View.
BE1-87B - Installation 4-3 Figure 4-4. S1 Case, Double-Ended, Panel Drilling Diagram, Semi-Flush Mounting Figure 4-5. S1 Case, Double-Ended, Panel Drilling Diagram, Projection Mounting, Rear View.
4-4 BE1-87B - Installation Stabilizing Reactor The stabilizing reactor for a three-phase relay is mounted on the rear of the relay. For projection mounting or convenience, the stabilizing reactor can be removed and relocated. R ewir e in accordance with the procedures and illustrations in this section.
BE1-87B - Installation 4-5 WARNING Relays manufactured prior to July 22, 1991 (EIA date code symbol 9129 and previous) do NOT have case jumpers between terminals 7 and 8 (single phase units). This also applies to three phase relays terminals 7 and 8, terminals 13 and 14, and terminals 17 and 18.
4-6 BE1-87B - Installation Figure 4-8. Typical DC Control Connections Figure 4-9. Single-Phase Sensing Input Connections.
BE1-87B - Installation 4-7 Figure 4-10. Three-Phase Sensing Input Connection.
4-8 BE1-87B - Installation Figure 4-11. Single-Phase Internal Connection Diagram.
BE1-87B - Installation 4-9 Figure 4-12. Three-Phase Internal Connection Diagram.
BE1-87G - Testing And Setting 5-1 CAUTION To avoid false tripping on three phase units, upper connection plug must be in place prior to inserting or removing lower connection plug. SECTION 5 • TESTING AND SETTING GENERAL Proper operation of the relay may be confirmed by performing the operational test procedures in this Section.
5-2 BE1-87G - Testing And Setting WARNING During testing, do NOT apply or generate continuous operate current greater than three amperes. If the operate current is greater than three amperes, a temperature increase in the reactor may result and cause insulation breakdown.
BE1-87G - Testing And Setting 5-3 Figure 5-2. Location of Assemblies (Single Phase Only) NON-COMPONENT SIDE OF LOWER MAGNETICS/SHIELD BOARD Figure 5-3.
5-4 BE1-87G - Testing And Setting NOTE Output contacts may be NC or NO, depending on st yle of relay. Check continuity at terminals 1 and 10 with relay tripped and not tripped to assure correct response for the type of contacts specified. Single-Phase Trip And Dropout Test Step 1.
BE1-87G - Testing And Setting 5-5 Figure 5-4. Sensing Input Range 1, Operating Characteristics.
5-6 BE1-87G - Testing And Setting Figure 5-5. Sensing Input Range 2, Operating Characteristics.
BE1-87G - Testing And Setting 5-7 RESTRAINT CURRENT ( AMPERES ) RESTRAINT CURRENT (AMPERES) 0 2 4 8 6 10 12 14 16 18 20 0 5 1 0 1 52 02 53 0 3 54 0 0 1 234 56 78 D2354-14 04-30-96 Ran g e 1 Ran g e 2 15 20 25 30 35 40 45 0 1 02 03 04 05 06 07 08 09 0 MULTIPLES OF PICKUP RESPONSE TIME (MSEC) Figure 5-6.
BE1-87G - Testing And Setting 5-9 NOTE Sensing Input Range 1: If R w is unknown, assume R w = 0.003 * N a Sensing Input Range 2: If R w is unknown, assume R w = 0.
5-8 BE1-87G - Testing And Setting NOTE If option B (current operated) targets are specified, the target is only operable when a minimum of 0.2 ampere is present in the output circuit (terminals 1 and 10). Phases B And C, Trip And Dropout Test Step 1. If the relay is a 3-phase relay, repeat steps 1 through 7 for phases B and C.
5-10 BE1-87G - Testing And Setting Table 5-1. Recommended Pickup Settings Vce (Lower Value) SFR 1 1.5 2 3 4 20 0.2 0.4 0.5 0.8 1.6 50 0.2 0.4 0.4 0.5 0.8 100 0.2 0.2 0.4 0.4 0.5 200 0.1 0.1 0.2 0.4 0.5 >200 0.1 0.1 0.2 0.4 0.5 Note: Use next higher setting if CTs are a mix of C classification and T classification.
BE1-87G - Testing And Setting 5-11 I d 1000 4.16× 3 0.15×200 138.8 30 4.6 × CT rating Inequality (1) is met with CT #2, but not with CT #1. However, since the locked rotor current is only 4.8 times CT rating [vs. the assumption of 20 times rated for inequality (1) ], the application is suitable.
5-12 BE1-87G - Testing And Setting Inequality (1) is met with CT #2, but not with CT #1. However, since the maximum external fault current is only 4.6 times CT rating [vs. the assumption of 20 times rated for inequality (1) ], the application is suitable.
BE1-87G - Maintenance 6-1 CAUTION Substitution of printed circuit boards or individual components does not necessarily mean the relay will operate properly.
BE1-87G - Manual Change Information 7-1 SECTION 7 • MANUAL CHANGE INFORMATION SUMMARY AND CROSS REFERENCE GUIDE This section contains information concerning the previous editions of the manual. The substantive changes to date are summarized in Table 7-1.
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