MPR3E5 Issue H - P&B

1 Issue H mpr 3e5 Digital Motor protection Relay P&B Engineering Belle Vue Works Boundary Street Manchester M12 5NG Tel: 0161 230 6363 Issue H Fax: 0161 230 6464 E-mail Contents 1. 2 2. 3 3. FEATURES AND CHARACTERISTICS .. 3 4. DESIGN .. 4 CIRCUIT 4 Analogue input circuits .. 5 Output 5 data 5 5. FRONT PANEL .. 6 ALPHANUMERIC 6 Mode 2 8 Fault indication .. 9 LED 9 Push 9 6. WORKING PRINCIPLES .. 10 ANALOGUE 10 DIGITAL 10 7. OPERATION AND SETTING .. 11 LAYOUT OF THE CONTROL 11 RELAY DISPLAY AND SETTING PROCEDURE.. 11 Display mode(1).. 11 Setting Mode (2).. 11 SETTING 13 t6x Setting .. 13 Speed Switch .. 13 Full Load Current Setting I FLC .. 13 CT Primary Setting .. 13 Hot/Cold Ratio Setting .. 14 Thermal Overload Pre-Alarm Setting .. 14 Number of Starts per Hour.. 14 Start Inhibit Time .. 14 Earth Fault Current .. 14 Earth Fault trip Time .. 15 Unbalance Current .. 15 Undercurrent Setting.

2 16 Undercurrent 16 High Set Overcurrent .. 16 High Set Overcurrent Time ..16 Low Set Overcurrent .. 16 Low Set Overcurrent Time ..16 Set 16 Serial Link Address, 16 Issue H MATRIX 17 Trip Relay Matrix, Tnnn .. 17 Programmable Relay Matrix, Pnnn .. 17 Alarm Relay Matrix, Annn .. 18 Earth fault parameters Matrix, 18 Trip/ Reset Matrix, 19 Thermal O/L Matrix, Cnnn ..19 Speed switch Matrix, Snnn .. 20 Advanced relay Matrix, Xnnn .. 20 DIP SWITCH 22 TEST 23 23 Hand 23 Auto-reset at Power Up .. 23 PHASE 23 SETTING VALUE 23 8. RELAY CASE .. 24 INDIVIDUAL 24 RACK 24 TERMINAL 24 9. COMMISSIONING AND TESTING THE 24 COMMISSIONING.. 24 TESTING.. 25 10. TECHNICAL DATA .. 28 MEASURING INPUT 28 AUXILIARY POWER 28 COMMON 28 29 OUTPUT CONTACT 31 SYSTEM 31 32 CONNECTION 33 11. ORDER 34 14/1/98 Page 2 Issue H 1. Introduction The application of powerful microprocessors opens a new chapter for power system protective relaying.

3 The digital processing of measured values and the ability to perform complex arithmetic and logic operations, give digital protection relays significant performance and flexibility improvements over their traditional analogue counterparts. Additional advantages - very small power consumption, adaptability, self-supervision, fault diagnosis through fault data recording, smaller physical construction and selectable relay characteristics - all combine to allow the implementation of accurate and highly reliable protection schemes at a significantly reduced financial burden. The development of microprocessor based protective relays and their introduction into the market has been stimulated by the recent trend to replace analogue with digital equipment. This modern trend has prompted the development of a new P&B protective relay family - the MR relay series. This comprehensive family of protection relays can satisfy the demands of even the most complex protection schemes: MRI - Overcurrent Relay (Independent + earth + directional facilities) MRI-V - Voltage Dependent Overcurrent Relay MREF - Restricted Earth Fault Relay MRMF - Mains Failure Relay MRNS - Negative Sequence Relay MRRP - Power Relay MRCS - Check Synchronising Relay MRFF - Field Failure Relay The superiority of digital protective relaying over traditional analogue devices, as embodied by the MR relay family, is summarised by the following features.

4 Integration of many protective functions in a single compact case High accuracy owing to digital processing Digital relay setting with very wide setting ranges and fine setting steps Comfortable setting procedure through extensive human - relay dialogue Measured values and fault data indication by means of alpha-numeric display Data exchange with DCS/SCADA by means of RS485 Operational reliability through self-supervision A similar but simplified range, with reduced functions and without display, is also available. The MIRI - overcurrent and earth fault relays, and the MIRV - undervoltage, overvoltage and neutral voltage displacement relays. To complement the MR series, a range of Auxiliary, Timing and Tripping devices are also available. The MPR range of motor protection relays embodies the developments in technology of the MRI, and MIRI as well as previous electronic motor protection relays, with the traditional knowledge and expertise developed over the long tradition of motor protection within P & B Engineering.

5 14/1/98 Page 3 Issue H 2. Application The mpr 3e5 is a universal digital adjustable motor protection relay. It serves as overload, overcurrent, negative sequence (unbalance), and general protection for synchronous and induction machines. With a large selection of adjustment possibilities, the mpr 3e5 is suitable for almost any type of machine. The protective functions of the mpr 3e5 are summarised as follows: Thermal Overload protection with adjustable current/time curves and selectable hot/cold ratios. Overload Pre-Alarm with a separate output relay. Low Set and High Set Overcurrent protection Single Phasing protection Start Limiter Earth/Ground Fault protection . Unbalance (Negative Phase Sequence) protection . Incorrect Phase Rotation protection . Undercurrent protection (Definite Time). Stall protection using a speed switch input. Fully Programmable Output Relay operation. Fault trip inhibit setting for Contactor Applications.

6 3. Features and characteristics Complete digital processing of the sampled measured values Digital filtering of measured values using discrete Fourier analysis to suppress high frequency harmonics and component induced by faults or system operations Self adjusting sample frequency for operation between 40 - 70Hz. Extremely wide setting ranges with fine setting steps Unauthorised user access control through password protection User defined password Continuous self-supervision of software and hardware Outstanding design flexibility for easy selection of appropriate operational scheme for numerous applications Numerical display of setting values, actual measured values and memorised fault data etc. Setting, Measured and Fault Parameters available via RS485 serial link. Wide voltage range for DC or AC power supply Withdrawable modules with automatic short circuit of inputs 14/1/98 Page 4 Issue H 4. Design Circuit Diagrams 18 POWERSUPPLY12 CASES upplyMPR 3E5 Typical Earthing ShownTRIP SIGNAL753648101412+171516 Gnd-91311 PROGRAMMABLEALARMRS4852122232425262728L1 L2L3I1I2I3 IES2P2P1S1 CHASSISEARTH1920 SPEED SWITCHIE2728 CBCTA lternative E/F connectionfor CBTR stab Fig 1 Connection Diagram for use with 3 line CT s and alternative core balance CT.

7 18 POWERSUPPLY12 CASES upplyMPR 3E5 Typical Earthing Shown753648101412+171516 Gnd-91311RS4852122232425262728L1L2L3I1I2 I3 IES2P2P1S1 CHASSISEARTH1920 SPEED SWITCHCBCTNote: Core Balance CT mustbe provided if earth faultprotection is requiredTRIP SIGNALPROGRAMMABLEALARM Fig 2 Special connection diagram when relay used with two line CT s. 14/1/98 Page 5 Issue H Analogue input circuits The constantly monitored measuring values are galvanically decoupled, filtered and finally fed to the analogue/digital converter. The protection unit receives these analogue input signals of the phase currents I1, I2, I3 and Earth fault Ie, via separate input transformers. Output relays The mpr 3e5 has three output relays, with single or dual pole change-over contacts as detailed in the previous diagram and summarised below: Tripping relay (2) Alarm relay (1) Programmable Relay (1) data communication The mpr 3e5 is provided with an RS485 interface for remote data communication with a control centre.

8 This facility provides the following information: Status signals Self supervision alarm signal Actual measured values Relay settings Fault signalling 14/1/98 Page 6 Issue H 5. Front panel The front panel of the mpr 3e5 comprises the following operation and indication elements: Alphanumeric display (4 Digits) 5 push buttons for setting and other operations 20 LEDs for measured value indication and setting Alphanumeric Display The measured and set values, and recorded fault data, are shown alphanumerically on the display. The meaning of the displayed values is easily interpreted from the LED indicators on the front panel. Because of the large adjustment possibilities the data on the MPR3E5 is split into a number of related groups Mode 1 Display. This shows the analogue values being read by the Relay. It is accessible by pressing the <SELECT/RESET> Button. It then cycles through the analogue values.

9 Mode 2 Setting. This shows the parameters that have been set on the relay. This is accessed when the correct password is entered when "P&B" is displayed on the screen. Then to cycle through the setting parameters press the <SELECT/RESET> button. Fault Indication. This indicates the current fault on the relay. When the relay trips a Mnemonic appears on the 4 digit display, indicating the current fault. 14/1/98 Page 7 Issue H Mode 1 Display. The following subset of parameters are available for viewing and are accessed using the <SELECT/RESET> push-button in a cyclic manner. Pressing for longer than 1 second returns to the start of the cycle. Parameters available are either actual real-time running values or memorised values as follows: Data Displayed (ALL CURRENTS IN PRIMARY AMPS) LED's Illuminated P&B (Relay Manufacturer) Actual line current L1 L1 (Green) Actual line current L2 L2 (Green) Actual line current L3 L3 (Green) Actual Earth Fault Current E (Green) Stored Max Starting Current L1 * L1 (Green - Red-Alternating) Stored Max Starting Current L2 * L2 (Green - Red-Alternating) Stored Max Starting Current L3 * L3 (Green - Red-Alternating) Earth Fault Current * E (Green - Flashing) Actual Load Current (%) * L1, L2 & L3 (Green) Actual Thermal Capacity (%) L1, L2 & L3 (Green - Flashing) Actual Unbalance (%)* I2 Total Number of Starts OPS/HR (Green) Total Hours Run OPS/HR (Green - Flashing) Latest Start Time in seconds ST (Green) Relay Address For Communications RS (Green) t6x Setting 1 (Green) Full Load Current (I FLC) 1 (Green - Flashing) Table 1 - Display mode (1)

10 In addition to the above, when the motor is starting the S/R LED indicates Green-Flashing and when the motor is running the S/R LED indicates Green-Steady. The value of motor load is held after a trip and updated when the next start is detected. Total hours run is the total time the relay has detected a running motor. When the kA illuminates the display value is multiplied by 1000, to read line current in kA or hours run in 1000 s of hours. * FOLLOWING A RELAY TRIP THIS VALUE IS THE STORED PRE-TRIP FAULT VALUE. TO RESET THE RELAY FOLLOWING A TRIP AND CANCEL THE STORED TRIP VALUES,(EXCEPT THE STORED MAX/STARTING CURRENT L1, L2 AND L3) PRESS THE <SELECT/RESET> BUTTON FOR MORE THAN 3 SECONDS, OR RE-START THE MOTOR. 14/1/98 Page 8 Issue H Mode 2 Settings. The setting parameters may be changed in mode 2. Data Displayed LED No/ Colour t6x Setting 1/ Green Full Load Current I FLC 1/ Green - Flashing CT Primary Setting In 9/ Green - Flashing Hot / Cold Ratio 9/ Green Thermal O/L Pre-Alarm 1/ Green/Orange -Alternating E/Fault Current, %In 2/ Green Earth Fault Time 2/ Green - Flashing NPS Current, %FLC 3/ Green Low Set O/C, %FLC 4/ Green Low Set O/C Time 4/ Green - Flashing High Set O/C, %In 5/ Green High Set O/C Time 5/ Green - Flashing Undercurrent, %FLC 6/ Green Undercurrent Time 6/ Green - Flashing Number of Starts/hr 7/ Green Start Inhibit Time 7/ Green - Flashing Set Password 8/ Green Serial Link Address 8/Rsnn on display Set Trip Relay Action Tnnn on Display Set Program.