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Summary of Contents for Besantek BST-GFL31
- Page 1 BESANTEK BST-GFL31 Ground-Fault Locator User Manual P-140313-V1.5 Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 TestEquipmentDepot.com...
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Page 2: Table Of Contents
1.7.3 Short circuit ..........................8 1.7.4 Current leakage ........................... 8 1.7.5 Tracing of Current Signal ......................8 2. MAIN OPERATION OF BST-GFL31 ....................... 8 2.1 General Steps for Fault Location ......................8 2.2 Operation Preparation ..........................9 2.3 Wire connection with DC System ......................9 2.4 Set Generator Output Signal ........................ - Page 3 3.2.2 Oscilloscope ..........................26 3.2.3 System Setting .......................... 26 4. SERVICE & MAINTENANCE ........................28 4.1 Self-Check ............................28 4.2 FAQ ..............................29 4.3 Cleaning & Storage ..........................30 4.3.1 Cleaning ............................ 30 4.3.2 Storage ............................30 5. CONTACT BESANTEK ..........................30...
- Page 4 Do not operate the equipment around explosive gas or vapor. Only use BESANTEK’s testing leads and other relative accessories with the locator. Before use, inspect the locator, testing leads and other accessories for mechanical damage and replace if necessary. Pay special attention to the insulation surrounding the connectors.
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Page 5: About Bst-Gfl31
It gives excellent solutions for troubleshooting and preventative maintenance. Compact and rugged design makes the BST-GFL31 easy to use in small places and harsh environment. 1.2 BST-GFL31 Main Functions 1.2.1 Ground Fault Location With comprehensive ways including signal strength, phase change and precise judgment for leakage current direction, it fast pinpoints ground fault. -
Page 7: Bst-Gfl31 Main Body
With backup firmware, software and user USB drive manual Qualification certificate 1.6.2 BST-GFL31 Main Body Below is picture of BST-GFL31 main body and functionality of each part. Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 TestEquipmentDepot.com... -
Page 8: Signal Receiver
BST-GFL31 User Manual Fig 1.6.2.1 After turning on the On/Off switch, press any key on the keypad to continue and you will see the main menu as below for each function. Use the arrow keys to highlight each and press ENT to confirm the selection or press Esc to go back. -
Page 9: Basic Concepts
Also, with one pair of current detectors working at the same time in the circuit, BST-GFL31 will have strong capability for anti-interference. Therefore, it could check ground fault effectively even when system is online without switching off the DC system. -
Page 10: Wire Mix-Connection
BST-GFL31 User Manual one point (or multi-points) becomes lower than tolerance value. Take following chart for example, Point A is the grounding point, R is the grounding resistance, C1 and C2 indicate distributed capacitances before and after the malfunction point. -
Page 11: Short Circuit
1.7.5 Tracing of Current Signal When we are using the BST-GFL31 to locate the faulty grounding, signal generator (main unit) will send a “current signal” in certain frequency to the circuit. This current signal will flow in the circuit. With a signal receiver (connected with a current detector), we will trace the current signal in different points of the circuit. -
Page 12: Operation Preparation
You are suggested to prepare well as below before going to the filed for earth fault tracing:: 1) Make sure that both BST-GFL31 signal generator and receivers are fully powered. Signal generator can work with power adaptor connecting with AC power supply. -
Page 13: Set Generator Output Signal
BST-GFL31 User Manual 2) If negative busbar has fault, connect black lead with negative and red lead with ground. Fig 2.3.3 Fault on negative busbar Drawings of current clamp in these two circuit diagrams are for your reference only. We will explain for their operation in detail in coming context. -
Page 14: Output Signal Adjustment
BST-GFL31 User Manual Warning! To avoid unwanted operation of relay in the DC system, please select current limit properly. In signaling circuit of railway station, over 5mA output current will cause unwanted operation of relay. In such circumstances, you are suggested to select 5mA. Otherwise, you are always suggested to select “UL”... -
Page 15: Output Signal To Circuit For Fault Location
1000V on the right side of screen (Fig 2.4.3.1) indicates the output voltage. Numbers on the right column (e.g.4 and 0 in Fig 2.4.3.1) are for BESANTEK’s R&D purpose, users can neglect it. All these numbers in the screenshots are for reference only; they are different in different circuits. -
Page 16: Return Circuit For Fault Location
Supposed that the fault is on positive busbar on the point called “Fault 1”, the current signal injected from BST-GFL31 signal generator will go all the way to the point “Fault 1”, outflow to the ground, finally goes back the signal generator via the testing lead and thus form a return circuit. -
Page 17: Set Signal Reference
BEEP. Screenshot like below (Fig 2.5.2.3) indicates 40% signal strength. Signal Reference Setting This is very important step for BST-GFL31 during ground fault location. After initial setting for receiving frequency and audio, click OK to proceed in the screen like Fig 2.5.2.3. - Page 18 BST-GFL31 User Manual Future signals will be compared against the reference point. For example, at the start of the circuit, referred to Point A in the following diagram, its current value of 20mA is set as 100%. Down the circuit, at Point C, its current value of 10mA will become 50%.
- Page 19 BST-GFL31 User Manual of red testing lead with the arrow mark (label on the clamp) pointing towards the direction of faulty point as Fig 2.5.2.7. Keep the current detector stable for around 5 seconds and then click the button Set Ref in the screen of signal receiver.
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Page 20: How To Locate Ground Fault
In this case, there will be high interference that is generated by distributed capacitance from the circuit itself. With BESANTEK’s dual-range current clamp, it can effectively cancel the interference and pinpoint the fault much faster. -
Page 21: Some Tips For Ground Fault Location
BST-GFL31 User Manual be the same (pointing towards the same load). The green arrow directions in Fig 2.5.3 indicate the right direction for current clamp in different situations. Important: Arrow direction of the current clamp in the circuit should strictly follow these rules. - Page 22 BST-GFL31 User Manual Fig 2.6.1.1 2) Determine new reference point: A new reference point should be set on the lower branch with the highest signal. In this example, Branch h was measured with the highest signal, as shown in Fig 2.6.1.2 (compared with Branch g).
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Page 23: Gross Searching
To save time, you could have more personnel holding more signal receiver checking simultaneously to narrow down the scope of signal searching. All BST-GFL31 signal receivers (of same frequency) could be used at the same time independently for ground fault location. They can have separate setting for reference point which will not affect each other. -
Page 24: Location For Other Ways Of Fault
BST-GFL31 User Manual If there is more than one point that have ground fault, you are suggested to find out the point of fault that has strongest signal and step by step to all the other faults. Fig 2.7 2.8 Location for Other Ways of Fault 2.8.1 Wire Mix-connection... -
Page 25: Short-Circuit Fault Location
BST-GFL31 User Manual Fig 2.8.1 2.8.2 Short-circuit Fault Location Short-circuit fault is similar to ground fault location. Signal generator will inject a signal to the circuit and use signal receiver to trace the current signal. 2.9 About Distributed Capacitance Distributed capacitance is very common phenomenon in DC systems. Generally there is big distributed capacitance when circuit lines are long and wiring structure is complicated in electric circuit. -
Page 26: Other Settings Of Generator And Receiver
This enables users to select the program between basic version and professional version. To simplify the operation, default setting of all BST-GFL31 units is basic version with working frequency of 10Hz. In professional version, users can have different selection for output frequency. -
Page 27: Firmware Version
Fig 3.1.2 3.1.3 Firmware Version Select “Version” in main menu, you will see firmware version of signal generator like below. BESANTEK continuously updates its software and firmware to make it easier to follow and more user-friendly. To get the latest update, you could log in our website to download at www.besantek.com. - Page 28 BST-GFL31 User Manual Fig 3.2.1.1 Fig 3.2.1.2 Spectrum resolution is selected among 0.5 Hz, 1 Hz, 5 Hz, 10 Hz and 25 Hz. Different resolutions have different related fineness and maximal frequencies. This will be reflected in the screen (Fig 3.2.1.3) when the current detector is near the tested circuit.
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Page 29: Oscilloscope
3.2.3.1 Frequency synchronization This is to make the receiving frequency of signal receiver identical with output frequency from signal generator. All BST-GFL31 units are defaulted as 10Hz output frequency and have been synchronized well with signal receiver before delivery to our customers. - Page 30 Fig 3.2.3.1.3 3.2.3.2 Signal Receiver Calibration All units are well calibrated in BESANTEK’s lab before they leave for our customers’. Generally it is no need to calibrate again. Upon big accuracy errors and calibration is needed. Please contact BESANTEK to get separate calibration manual.
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Page 31: Service & Maintenance
BESANTEK USB to avoid any conflict. 4. SERVICE & MAINTENANCE 4.1 Self-Check Before ground fault location with BST-GFL31, please follow the steps below for self-check of the equipment: To ensure the performance of signal generator and receiver for long time operation, please charge them timely. -
Page 32: Faq
BST-GFL31 User Manual resistance become 0. Current value is around 2.7mA. For testing of voltage, resistance and current, please refer to “2.4 Set Generator Output Signal”. Note: To ensure the security of equipment, please DO NOT output higher voltage for short-circuit. -
Page 33: Cleaning & Storage
4.3.2 Storage After using BST-GFL31, put the main unit and all its accessories into the carrying case, store the case in ventilating place under proper temperature and humidity. Never expose the equipment and its accessories to water, high humidity, or dampness.
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