Basler BE1-47N negative sequence voltage phase sequence relay

Basler BE1-47N negative sequence voltage phase sequence relay

Chapter 1 Product Introduction

1. The core principle is to monitor the negative sequence voltage V2 of the three-phase system. System phase loss, phase reverse connection, three-phase imbalance, overvoltage/undervoltage will all generate negative sequence components, and the relay will protect accordingly. 2. Typical application scenarios

Motor protection: prevent reverse phase and phase loss starting; Three phase imbalance and overvoltage/undervoltage tripping during operation; The motor generates a 16% negative sequence voltage due to no-load/on load phase loss. This machine has high sensitivity and is not affected by frequency, which compensates for the traditional undervoltage relay's inability to recognize the motor's back electromotive force phase loss.

Transformer, line, synchronous phase-shifting camera: detects incoming phase sequence errors.

Automatic switching circuit: Ensure that the phase sequence and voltage are qualified after switching.

Capacitor compensation cabinet: The melting of the fuse triggers three-phase imbalance protection.

Busbar and static load: three-phase unbalanced fault protection.

3. The negative sequence background of the industrial normal power supply has a negative sequence voltage of only 1% to 2%; Exceeding this value indicates a power supply failure, which will increase motor losses (3.5% negative sequence voltage will increase motor losses by 25%).

4. The phase sequence characteristic equipment calculates negative sequence based on line voltage and is sensitive to the direction of phase sequence rotation. The manual defaults the wiring to ABC phase sequence.

5. Model coding rules (Style number) Model BE1-47N+Style code, segmented definition of hardware configuration:

Input sampling type (three-phase line voltage), rated sampling voltage (120V60Hz/100V50Hz/208V60Hz/173V50Hz)

Output relay (normally open NO/normally closed NC, single/double main relay)

Control power supply (24/48/125/250VDC, 120/240VAC)

Protection time limit characteristics (instantaneous/timed/inverse time limit, 47N negative sequence, 27 undervoltage, 59 overvoltage can be independently configured)

Fault indicator (built-in electronic drive/current drive, single/dual target)

Quantity and installation method of auxiliary output relays (semi embedded/protruding S1 housing)

Example: E3FE1PA1R0F represents three-phase line voltage acquisition, 120V60Hz, dual main NO output, negative sequence definite time, 125VDC/120VAC power supply, single built-in indicator, undervoltage instantaneous, overvoltage instantaneous, no auxiliary output, semi embedded installation.

Chapter 2 Panel Controls and Indicators

All operating components are integrated into the front panel, divided into 7 categories of components:

Power indicator light A (red LED): It lights up when the power supply is normal.

Negative sequence voltage 47N regulating component B

Wheel setting: 2%~32% rated voltage, step size 2% (A~S gear);

Timing wheel: timing/inverse time limit machine configuration, not available for instantaneous models;

Action LED: Illuminates when negative sequence exceeds the limit.

Undervoltage 27 regulating component C (optional)

Setting range: 2%~32% decrease in rated voltage;

Equipped with delay dial and undervoltage action indicator light.

Calibration Table D: Panel printing, indicating the corresponding percentages for each gear.

Fault indicator reset button E: Manually clear the latch fault light.

Output test button F: Press with an insulating rod to manually trigger the main output relay (without affecting the power status contacts).

Fault target indicator light G: electronic latch red light, remains lit after tripping; Power off and turn off, restore power to restore latch; The current type target requires a tripping circuit of ≥ 200mA to trigger.

Overvoltage 59 regulating component H (optional)

Setting range: 2%~32% increase in rated voltage;

Equipped with delay dial and overvoltage action indicator light.

Chapter 3 Functional Description

1. Hardware signal flow diagram: three-phase voltage → built-in PT isolation voltage reduction → phase shifting filtering → sequence component separation → low-pass filtering (only allows 50/60Hz fundamental wave) → comparator judgment → timing logic → drive output relay+indicator light+fault target.

2. Core signal processing module

Voltage sampling: Built in PT eliminates zero sequence components and provides electrical isolation; Four standard sampling specifications are compatible with 50/60Hz systems.

Phase shifting summation: The secondary voltage of each phase is shifted by ± 45 ° and superimposed to cancel out the positive sequence component, retaining only the negative sequence V2.

Set the scaling circuit: Set the negative sequence action threshold for the dial resistor network.

Low pass filtering: filters out harmonics and only responds to power frequency faults.

Three independent comparators: negative sequence 47N, undervoltage 27, overvoltage 59, with completely independent protection logic.

3. Three time limit characteristics (each protection can be selected separately)

The parameter range of the time limit type in the table is instantaneous action speed without delay setting<50ms, with a time limit of 0.1~9.9s, a step size of 0.1s, an accuracy of ± 5% or ± 50ms, and a reverse time limit of 01~99 gears. The more severe the fault in the corresponding standard reverse time limit curve, the faster the action. Supplementary information: The delay dial of the timing/reverse time limit model is set to 00 and the instantaneous action is equivalent.

4. Classification of output circuits

Main tripping output: divided into 47N negative sequence, 27/59 overvoltage and undervoltage independent relays, with optional normally open/normally closed contacts, used to directly trip the equipment.

Auxiliary output (optional): synchronized with the main trip action, used for alarm and signal upload.

Power status contact (normally closed): When the relay is powered normally, the coil is excited and the contact is disconnected; Contact closure in case of power loss/± 12V internal power failure, used to monitor the power supply status of the device.

5. Two types of fault indicators

Built in driver type: There is no requirement for tripping circuit current, and it is recommended to use normally closed output contacts;

Current driven type: The tripping circuit current must be ≥ 200mA to light up; Before 2007, it was mechanical disk locking, but now it is unified electronic LED locking.

6. Wide range isolated power supply with no polarity requirements; Front panel power light+power status contact dual monitoring power supply.

Chapter 4 Installation

1. Check the model and appearance of the goods upon receipt and storage; Temporarily do not install and store in the original box for moisture and dust prevention; Backup equipment can be powered on for 30 minutes every year to extend the lifespan of electrolytic capacitors.

2. Install safety regulations

The minimum current for the tripping circuit of the current type fault indicator is 200mA;

Before conducting the insulation withstand voltage test, it is necessary to unplug the terminals and extract the relay body, otherwise the protection will be lost;

Grounding: The cabinet grounding terminal is separately grounded with ≥ 12AWG copper wire to the grounding bar;

EMI suppression: When the contact drives the external coil, parallel reverse diodes absorb surges (Rev P new requirement);

Solid state without mechanical components, no mandatory vertical installation requirements, and can be installed at any angle.

3. The shell and opening size are unified for S1 shell, providing two installation form drawings (semi embedded and protruding), indicating inch/millimeter dual size, panel opening, fixing screw position, and backplane terminal layout.

4. Wiring specifications

Conventional wiring ≥ 14AWG copper wire, check the model before wiring to avoid burning the equipment;

Sampling input: motor star/delta universal three-phase connection, connected to AB, BC, CA line voltage;

Control circuit: device power supply, trip output, auxiliary signal, grounding terminal backplane definition;

Internal circuit: sampling, protection logic, power supply, target indicator light, auxiliary output terminal partition layout.

5. Maintenance instructions: There is no regular preventive maintenance, only regular functional verification is required; Contact the manufacturer's after-sales service directly for any malfunctions.

Chapter 5 Testing

Functional action testing (action/return value) and time limit verification testing (timed/inverse timed), with testing errors affected by testing equipment, wiring, and fixtures.

1. Negative sequence 47N action and return test (simple single-phase equivalent method)

Short circuit B and C phases, only phase A is pressurized to simulate imbalance and generate negative sequence;

Provide four standard trigger voltage calculation formulas corresponding to sampling voltages: (V_{AB}=V_{2PU} × sqrt {3} × V_N );

Return value: 98% of the action voltage, error ≤ 2%;

Can rotate and short-circuit different phases to complete full phase verification.

2. Set the overvoltage test to a 10% increase and apply 110% of the rated voltage to activate; Reduce the voltage to 98% of the operating value and return.

3. Set the undervoltage 27 test to a 10% lower gear and apply 90% of the rated voltage to activate; Boost to 102% action value and return (revised in 2020 version).

4. Time limited verification takes overvoltage as an example, applies excessive voltage, records the time from fault application to contact closure, and allows for an error of ± 5%.

5. Inverse time limit verification takes negative sequence as an example, applies twice the action threshold voltage, matches the measured action time with the standard inverse time limit curve, and provides standard test voltages for each sampling specification.

6. Distinguish the 47N negative sequence test circuit and the 27/59 overvoltage/undervoltage test circuit in the test circuit diagram, and provide external timing switches and voltage source wiring diagrams.

Chapter 6 Technical Specifications

1. Voltage sampling input

Rated: 50Hz (100/173Vac), 60Hz (120/208Vac);

Continuous tolerance: 160% Un; frequency range 45~55Hz (50Hz model)/55~65Hz (60Hz model); Each phase is loaded with 2VA.

2. Control the power supply with multiple specifications of 24/48/125/250VDC, 120/240VAC wide voltage input, DC power consumption of 4.6W, AC apparent power of 17.5-24.4VA; the starting voltage of 24VDC models is 14V, which can be as low as 12V after operation.

3. Accuracy of three major protection settings

47N negative sequence: set 2-32% Un, step size 2%, accuracy ± 1% Un; return 98% action value;

27 undervoltage: set 2-32% Un, step size 2%, accuracy ± 1%; Return 102% action value;

59 overvoltage: set 2-32% Un, step size 2%, accuracy ± 1%; Return 98% of the action value.

4. Time limit accuracy with a time limit of ± 5%; Inverse time limit ± 5% or ± 50ms; instantaneous ＜ 50ms.

5. The output contact capacity is rated for AC resistive, DC resistive, and inductive loads; 120VAC continuous 7A; 250/500VDC short-term high current connection, breaking current is only 0.3A.

6. Environmental and reliability testing

Impact: Three axis 15G without damage; Vibration: 2G, 10~500Hz sweep frequency;

Voltage resistance: The whole machine is grounded at 2121VDC, with 1500VAC between input and output;

Electromagnetic compatibility: meets IEEE C37.90, C37.90.1/2 surge and RF interference standards;

7. Physics and Authentication

Weight 6.35kg (14lb), standard S1 shell;

UL508 certification, no UL certification for contacts>250V;

Summary of Core Security Points

Before installation, read the manual completely. Non professionals are prohibited from operating it;

Confirm the stability of the system operating conditions before dismantling the relay, otherwise loss of protection may cause equipment damage and personal injury;

Strictly follow the steps for wiring, voltage withstand testing, and live verification to prevent the relay from burning out;

The current driven fault indicator must ensure that the tripping circuit current is ≥ 200mA;

High power coil parallel freewheeling diode suppresses electromagnetic interference;

The equipment contains California No. 65 controlled chemicals, and specific ingredients can be found on the official website.