Ներքին լայնությամբ հոսանքի դիմադիմ փոխակերպիչների և նրանց հայտնաբերման մեթոդների հետազոտությունը
1. ONENTSIN ARJELUČ'YUT'YUNNERI U ŠXARH
TA (bacelakan naxč'i tranformator) u elektri mejanqagrum e bacelakan elektri mejanqagrut'yan vercical qomponentner: Mejanqagrumi arjeqi 60A-i minchev e: Elektri mejanqagrumneri tipi, modeli u anti-DC kaxatvacnere iranc en: Nor noruyn mekanizmum e mejanqagrutanum: DC komponentneri mahanaluc heto karox e mejanqagru arjeluc, voxxeacvec' non-linear baxveluc: DC u silicium-vercarer eqipmaneri episkopum, mecnavar elektrifikacian patmut'yan u plastik texnikum anjarvac, DC komponentneri riski arcviqealov: Bacelakan anti-DC naxč'i tranformatorneri u detektorneri šxarh miacnum e talis problemi paterazmi mej.
2. TA INARJELOV BACMI DC KOMPONENTNEROV HETO
Bacelakan naxč'i tranformatornerin DC bias-in erkaruc heto priniari DC komponentneri mahanalu: Teorēti hamar, DC generacian harmonikneri mejanqagrut'yan tarberak grel: Nerkayi magnitik fluxi ev xarkvec' el excitation currenti lini takem: Meji hetaqaruc e TA inarjealov: Erkaruc testneri (32% DC komponentneri hanaparz hanaparzi), magnitik permeability-i kamatakan e, stexcen errorneri (negativ shift, saturation): Secundi hanaparzi orinakavor waveforms: Testneri tverci, hanaparz currentneri nor noruyn tranformatorneri mech dzev errorneri, petq e teeny DC komponentneri heto low-voltage anti-DC tranformatorneri mejanqagru arjeluc, errorneri eki exenc arajin.
3. ANTI-DC BACELAKAN NAXČ'I TRANFORMATORNERI R&D
Tradicional bacelakan tranformatorneri amorphous ribbons (high magnetic permeability, low saturation coefficients, primary-side DC chexarkel): Iron-based amorphous cores, etevoch mer magnitik permeability, imana iron loss, power transformers: Inoral initial magnetic susceptibility u low coercivity, anti-DC kaxatvacne: Elektri waves secundi hanaparzi mej primary current waveform: Iron-based amorphous u ultra-microcrystalline materials, composite cores, tradicional bacelakan anti-DC tranformatorneri mejanqagru arjeq:
4. TA anti-DC performance detection methods INVESTIGATIONS
Exist anti-DC low-voltage current transformers generally have the problem of lack of detection methods. The previous standards are not standardized and cannot be judged according to unified rules and specifications. Therefore, how to do a good job in the anti-DC performance detection method and optimize it is urgent.
4.1 ELECTRIC ENERGY COMPARISON
Bacelakan naxč'i tranformatorneri mej, AC elektri mejanqagrumi mijecav: Even harmonics proportion mijecav: Clear assessment hanaparz rectification electric energy comparison test line: Before the test, half-wave rectification electric energy comparison method experimental line should be appropriately improved based on the actual situation to ensure that it is consistent with the anti-DC performance of the low-voltage current transformer, thereby improving the accuracy of electric energy detection.
4.2 1/1 SELF-CALIBRATION
Test circuit diagram selected based on JJ G1021-2007 "Regulations for the Verification of Power Transformers", details shown in Figure 1.
To optimize 1/1 self-calibration, experiment rewinds secondary winding with same turns as test low-voltage current transformer. This avoids error introduction from standard transformers. Circuit measures half-wave current and clarifies errors. Note: Current transformer in circuit uses 10/1 ratio to boost verifier's current, so test values must be multiplied by 10 for accuracy.
Experiments prove this method effectively detects anti-DC performance, enabling circuit testing and self-calibration while avoiding measurement errors. However, rewinding is needed before measurement. Current and detection efficiency inversely related: as current rises, efficiency plummets but labor intensity increases. Thus, half-wave DC composite error can't accurately reflect individual anti-DC performance.
5. TEST VERIFICATION
5.1 TEST METHOD
Simulating half-wave DC electricity theft by electric furnace users, test installs three distinct energy metering devices. Repeated comparisons of performance results show manganin-resistance energy meters have superior anti-DC shunting ability, meeting on-site stability needs.
5.2 TEST DATA
Adequate prep, scientific plans, and pre-test site verification key. During 80-day assessments, energy repeatedly compared/calculated, detailed records. Results: Initial ordinary transformer meters show 40.08% relative error, rising to 90.58% after 80 days. Manganin meters keep errors ≤1% even in harsh conditions, while traditional devices exceed 90% over time. Enhancing anti-DC transformer research vital for on-site demands.
6. CONCLUSION
New composite-core low-voltage anti-DC current transformer accurately measures current, meets standards even under DC loads. Unlike traditional designs, retains familiar winding/pouring processes for easy promotion. DC-AC standard-based transformers offer strong operability, solving traceability issues, boosting detection accuracy.
